Response to Climate Change (incl. case of Carbon Capture)Shibojyoti Dutta
The presentation contained context of Iron & Steel w.r.t. Climate Change, response of sector in India and Tata Steel. Sustainable solution offered by Tata Steel and brief discussion on Carbon Capture prospects at BF at the National seminar on “Environmental Prisnciples, Policies and Climate Change” organised by Indian Institute of Metals - Kolkata Chapter on 16 Dec 2010 at Taj Bengal, Kolkata
Innovative engineering design in circulating fluid bed technologyIgor Sidorenko
Sneyd, S., Sidorenko, I., Orth, A., & Laumann, M.-D. (2007) Innovative engineering design in circulating fluid bed technology. Paper presented at CHEMECA conference, Melbourne.
“A study on the accretion formation in DRI kilns and possible ways for its re...iosrjce
IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of mechanical and civil engineering and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in mechanical and civil engineering. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Response to Climate Change (incl. case of Carbon Capture)Shibojyoti Dutta
The presentation contained context of Iron & Steel w.r.t. Climate Change, response of sector in India and Tata Steel. Sustainable solution offered by Tata Steel and brief discussion on Carbon Capture prospects at BF at the National seminar on “Environmental Prisnciples, Policies and Climate Change” organised by Indian Institute of Metals - Kolkata Chapter on 16 Dec 2010 at Taj Bengal, Kolkata
Innovative engineering design in circulating fluid bed technologyIgor Sidorenko
Sneyd, S., Sidorenko, I., Orth, A., & Laumann, M.-D. (2007) Innovative engineering design in circulating fluid bed technology. Paper presented at CHEMECA conference, Melbourne.
“A study on the accretion formation in DRI kilns and possible ways for its re...iosrjce
IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of mechanical and civil engineering and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in mechanical and civil engineering. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Technologies to transform steelmaking sludge dust into byproductsJorge Madias
Presentation at a round table in ABM Week 2015, with an overview of the generation of steelmaking byproducts worldwide and a discussion of the technologies available for EAF / BOF dust and sludge recycling
Introduction to copper rotor induction motorsLeonardo ENERGY
Copper rotors are now being used in different branches of industry, especially for applications where high efficiency is required. Industrial applications include motors for high-speed machining centers, pumps, drills, compressors and fans. Transport applications include asynchronous motors for electric traction, starter-alternators, generators, and electric power-steering.
On April 17 2015 the Committee on Climate Change held their first meeting in Wales, Cardiff. A range of stakeholders were invited to discuss the challenges faced by Wales in implementing its low-carbon strategy.
Automobile Management System Project Report.pdfKamal Acharya
The proposed project is developed to manage the automobile in the automobile dealer company. The main module in this project is login, automobile management, customer management, sales, complaints and reports. The first module is the login. The automobile showroom owner should login to the project for usage. The username and password are verified and if it is correct, next form opens. If the username and password are not correct, it shows the error message.
When a customer search for a automobile, if the automobile is available, they will be taken to a page that shows the details of the automobile including automobile name, automobile ID, quantity, price etc. “Automobile Management System” is useful for maintaining automobiles, customers effectively and hence helps for establishing good relation between customer and automobile organization. It contains various customized modules for effectively maintaining automobiles and stock information accurately and safely.
When the automobile is sold to the customer, stock will be reduced automatically. When a new purchase is made, stock will be increased automatically. While selecting automobiles for sale, the proposed software will automatically check for total number of available stock of that particular item, if the total stock of that particular item is less than 5, software will notify the user to purchase the particular item.
Also when the user tries to sale items which are not in stock, the system will prompt the user that the stock is not enough. Customers of this system can search for a automobile; can purchase a automobile easily by selecting fast. On the other hand the stock of automobiles can be maintained perfectly by the automobile shop manager overcoming the drawbacks of existing system.
Event Management System Vb Net Project Report.pdfKamal Acharya
In present era, the scopes of information technology growing with a very fast .We do not see any are untouched from this industry. The scope of information technology has become wider includes: Business and industry. Household Business, Communication, Education, Entertainment, Science, Medicine, Engineering, Distance Learning, Weather Forecasting. Carrier Searching and so on.
My project named “Event Management System” is software that store and maintained all events coordinated in college. It also helpful to print related reports. My project will help to record the events coordinated by faculties with their Name, Event subject, date & details in an efficient & effective ways.
In my system we have to make a system by which a user can record all events coordinated by a particular faculty. In our proposed system some more featured are added which differs it from the existing system such as security.
Technologies to transform steelmaking sludge dust into byproductsJorge Madias
Presentation at a round table in ABM Week 2015, with an overview of the generation of steelmaking byproducts worldwide and a discussion of the technologies available for EAF / BOF dust and sludge recycling
Introduction to copper rotor induction motorsLeonardo ENERGY
Copper rotors are now being used in different branches of industry, especially for applications where high efficiency is required. Industrial applications include motors for high-speed machining centers, pumps, drills, compressors and fans. Transport applications include asynchronous motors for electric traction, starter-alternators, generators, and electric power-steering.
On April 17 2015 the Committee on Climate Change held their first meeting in Wales, Cardiff. A range of stakeholders were invited to discuss the challenges faced by Wales in implementing its low-carbon strategy.
Automobile Management System Project Report.pdfKamal Acharya
The proposed project is developed to manage the automobile in the automobile dealer company. The main module in this project is login, automobile management, customer management, sales, complaints and reports. The first module is the login. The automobile showroom owner should login to the project for usage. The username and password are verified and if it is correct, next form opens. If the username and password are not correct, it shows the error message.
When a customer search for a automobile, if the automobile is available, they will be taken to a page that shows the details of the automobile including automobile name, automobile ID, quantity, price etc. “Automobile Management System” is useful for maintaining automobiles, customers effectively and hence helps for establishing good relation between customer and automobile organization. It contains various customized modules for effectively maintaining automobiles and stock information accurately and safely.
When the automobile is sold to the customer, stock will be reduced automatically. When a new purchase is made, stock will be increased automatically. While selecting automobiles for sale, the proposed software will automatically check for total number of available stock of that particular item, if the total stock of that particular item is less than 5, software will notify the user to purchase the particular item.
Also when the user tries to sale items which are not in stock, the system will prompt the user that the stock is not enough. Customers of this system can search for a automobile; can purchase a automobile easily by selecting fast. On the other hand the stock of automobiles can be maintained perfectly by the automobile shop manager overcoming the drawbacks of existing system.
Event Management System Vb Net Project Report.pdfKamal Acharya
In present era, the scopes of information technology growing with a very fast .We do not see any are untouched from this industry. The scope of information technology has become wider includes: Business and industry. Household Business, Communication, Education, Entertainment, Science, Medicine, Engineering, Distance Learning, Weather Forecasting. Carrier Searching and so on.
My project named “Event Management System” is software that store and maintained all events coordinated in college. It also helpful to print related reports. My project will help to record the events coordinated by faculties with their Name, Event subject, date & details in an efficient & effective ways.
In my system we have to make a system by which a user can record all events coordinated by a particular faculty. In our proposed system some more featured are added which differs it from the existing system such as security.
Forklift Classes Overview by Intella PartsIntella Parts
Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
For more technical information, visit our website https://intellaparts.com
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
NO1 Uk best vashikaran specialist in delhi vashikaran baba near me online vas...Amil Baba Dawood bangali
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Democratizing Fuzzing at Scale by Abhishek Aryaabh.arya
Presented at NUS: Fuzzing and Software Security Summer School 2024
This keynote talks about the democratization of fuzzing at scale, highlighting the collaboration between open source communities, academia, and industry to advance the field of fuzzing. It delves into the history of fuzzing, the development of scalable fuzzing platforms, and the empowerment of community-driven research. The talk will further discuss recent advancements leveraging AI/ML and offer insights into the future evolution of the fuzzing landscape.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Courier management system project report.pdfKamal Acharya
It is now-a-days very important for the people to send or receive articles like imported furniture, electronic items, gifts, business goods and the like. People depend vastly on different transport systems which mostly use the manual way of receiving and delivering the articles. There is no way to track the articles till they are received and there is no way to let the customer know what happened in transit, once he booked some articles. In such a situation, we need a system which completely computerizes the cargo activities including time to time tracking of the articles sent. This need is fulfilled by Courier Management System software which is online software for the cargo management people that enables them to receive the goods from a source and send them to a required destination and track their status from time to time.
1. “We see the Future”
3rd India International DRI Summit, Aug 2016
Paper presentation at
3rd India International DRI Summit 2016
New Delhi, India
August 19, 2016
Joachim D Souza, Acting CEO & GM
SULB Steel Company, Bahrain
Innovative Use of High Percentage Quality DRI in EAF
&
it’s Benefit in Cost Reduction
2. Steel Production and Per Capita Consumption
* India is the 3rd highest steel producer in the world
• The 12th 5 year plan projected 91.46 MTPA in 2015-2016
• Per capita consumption in India is 60kg which is one fourth of
international average.
3rd India International DRI Summit, Aug 2016 2
3. Mini – Mill concept based on DRI (Direct Reduced Iron)
• First commercial plant built by Willy Korf at Hamburg Stahlwerke /
Germany in early seventies which was based on:
Process selected:
• Midrex Direct Reduction shaft furnace for iron ore reduction
• Continuous Feeding of highly metallized DRI into UHP-Electric Arc Furnace
• Continuous billet caster
• Wire/rod rolling mill
Other important features:
• Located close to sea for receiving iron ore directly by ship and shipping finished
products or supplying into local market
• Availability of natural gas at competitive price
• Scrap supply either by ship or from closeby local market
• Close to power grid for supply of EAF
• Close to market for finished products
3rd India International DRI Summit, Aug 2016
This was a major step to have fully integrated steelmaking based on a combination of Direct Reduction
and scrap in various ratios depending on market prices of scrap/cost of producing DRI and melting in
UHP-Electric Furnaces that revolutionized the world in the seventies.
3
4. Mini – Mill concept based on DRI (Direct Reduced Iron)
• In parallel, enormous developments in UHP-Electric Arc Furnaces
starting in USA (Schwabe).
Further developed in Japan (water cooled side walls and foaming slag).
Perfected in Germany in the early eighties.
That pushed the share of Electric Furnace Steelmaking to close to 40% on
world wide basis. Compare this to conventional Integrated Steelworks based
on Coke ovens, Blast Furnaces and BOF-converters.
This new route allowed creation of new integrated steelmaking capacity based
on:
• Much lower capital costs
• Shorter erection and commissioning time
• Less environmental issues
• Smaller incremental steps to start a new plant and to expand later
• Much less space required
• Closer to the market
3rd India International DRI Summit, Aug 2016
However, this integrated steelmaking route based on DRI can only be justified in regions where cheap
natural gas reserves are available. (Mexico, Venezuela, Middle East, Russia)
4
5. World DRI Production by Region
3rd India International DRI Summit, Aug 2016
million
tons
Source :www.midrex.com
5
India is the largest producer of DRI in the world (17.68MT)
6. Present status of DR processes
3rd India International DRI Summit, Aug 2016 6
• India produce 17.68 Million tons of DRI and Iran 14.55 Million tons
• Large quantity of DRI made in India is by rotary kilns using Coal
• But compared to 2010 the coal based production down by 20% due
to coal availability & Environmental cost.
7. Comparison between scrap and DRI properties
Scrap:
• Large variation in quality, depending on source and processing (e.g.
shredder, mill returns, baling scrap)
• Scrap selection and processing is required for more demanding steel
grades (e.g. wire drawing, high carbon)
• Quality is mainly measured with regard to
– Residual content (Cu, Ni, Cr, Mo…)
– Density
– Cleanliness
• Quality will influence all main conversion costs, yield and productivity on
scrap based EAF-operation
• Scrap contains carbon and metallics that are oxidized during steelmaking,
thereby contributing to additional chemical heating with oxygen
DRI:
• Consistent quality depending on ore feed mix into DRI plant
• Virtually free of residuals (Cu, Ni, Mo)
• Very low in sulfur
• Ore supply determines amount and composition of gangue, S and P
3rd India International DRI Summit, Aug 2016
7
8. Advantages of DRI
• Can be continuously fed via roof into EAF
• High carbon supplies additional energy when reacting with oxygen
(exothermic reaction)
• Nitrogen and hydrogen low because of continuous CO – boil
• Quality depends mainly on iron ore selected (Total Fe-content, gangue
content and composition including P, S) and operation of DRI-plant
(Metallization and carbon content)
• Better foaming slag and more stable and higher power input during
continuous feeding.
• Low residual, high quality steel can be produced
• The development HOT DRI charge has revolutionized DRI melting in EAF
3rd India International DRI Summit, Aug 2016
8
9. Disadvantages of using DRI
• If quality of ore is low in particular Fetotal, and if gangue contents high and
mainly acidic, melting costs will increase substantially and yield drop
because of high slag volumes
• There are no metallics that can be oxidized during melting. (e.g., Si, Al,
Mn) to supply additional chemical heat with oxygen, only carbon is
available for oxidation to CO
• Acid gangue components must be slagged with large additions of
lime/dololime to achieve required basicity.
• There is always remaining FeO in DRI which must either be reduced with
carbon (endothermic reaction) or it is lost in slag (reduction in yield).
• High percentage DRI usage up to 100% can only be economically justified
when using highest quality DRI.
• High grade iron ore resources are limited and come with higher price
3rd India International DRI Summit, Aug 2016
9
10. DRI Processes
A. Natural gas and coal are the two primary fuels used in DRI production.
Whereas more than 90% of the global DRI plants use (lower grade) natural
gas, production in India is primarily coal based.
B. DRI processes can be divided up by the type of reactor employed, namely:
• Shaft furnaces (Midrex®, HyL)
• Rotary kilns (SL/RN process)
• Rotary hearth furnaces (Fastmet®/Fastmelt®, and ITmk3®)
• Fluidized bed reactors (Circored® (IPPC, 2009)
• In DRI production, India deserves special attention not only because the
country is the larges producer of DRI, but also because production is
primarily coal based. In India DRI plants can be easily erected with the help
of local suppliers, and the investment in a 100 t/d capacity DRI plant can be
recovered in 12 to 18 months. There is a large number of DRI producers in
India, and their numbers are continuously increasing.
3rd India International DRI Summit, Aug 2016
10
11. Coal vs gas based direct reduction
How does it influence the conversion costs in EAFs
3rd India International DRI Summit, Aug 2016
11
Coal vs gas based direct reduction
12. Rotary kiln process – Main features
Developed by Lurgi, Stelco and Krupp in the 1970s
Maximum production: 180 000 tons/year
Reduction kiln with peripheral air tubes for combustion of coal and
reduction of ore
Ore and 50 % of coal introduced on feeding side, 50 % of coal blown in
from exit side
Mostly lump ore used (8 – 16 mm)
Reduction temperature 1050 °C in the bed, gas 1150 °C
Courtesy of JRP
Courtesy of Outotec
3rd India International DRI Summit, Aug 2016 12
13. Shaft furnace process – Main features
• Commercialised by Midrex & Korf (Hamburger Stahlwerke)
• Hyl (Mexico) initially worked with 3 stage retort process, later single
shaft
• Reformer for converting natural gas to CO/H2 reduction gas
required (with Ni-catalyst at Midrex plant)
• Oxygen enrichment to increase reduction temperature and gas
heating with recuperators from 850 to over 1000 °C
• Mostly iron ore pellets and some lump ore to avoid sticking
• Carbon enrichment in cooling zone (up to 3 %!)
Hot briquetting (HBI)
Hot charging into adjacent EAF
Upscaling from 400 000 t/a to over 2 500 000 t/a
3rd India International DRI Summit, Aug 2016
13
15. HYTEMP system for hot charging
3rd India International DRI Summit, Aug 2016
15
16. Iron Ore Quality
FeTotal
Only ore with FeTotal > 66 % shall be used
Gangue content and composition, basicity
High basicity
High MgO content
Low Al2O3 content
Sulfur and phosphorus content
Sulfur: Generally very low. May increas in rotary kilns depending on
the used coal
Phosphorus: High contents may cause problems to end products with
low P limitations
3rd India International DRI Summit, Aug 2016
16
17. Iron Ore Properties
Type Lump Ore Iron Ore Pellets
Supplier Kumba LKAB Vale GIIC SAMARC
O
South-
Africa
Sweden Brazil Bahrain Brazil
Fetot 66.2 67.9 68.0 67.6 68.0
Gangue
SiO2 3.18 0.85 1.43 1.60 1.35
CaO 0.12 0.86 0.60 0.33 0.74
Al2O3 1.21 0.25 0.55 0.47 0.40
MgO 0.11 0.72 0.38 0.55 0.20
Basicity
CaO/SiO2 0.04 1.01 0.42 0.21 0.55
P 0.055 0.026 0.021 0.030 0.043
S 0.014 0.002 0.0015 0.002 0.002 17
18. DRI Properties
Degree of metallisation
High degree of metallisation decreases costs in EAF
Gangue content, composition and basicity
The less gangue and the more basic, the better
Carbon content
Coal based process: No carbon present in DRI
Gas based process: Deposited as Fe3C in cooling zone
Hot charging
Only possible with gas based DRI (one of the main advantages)
Hot briquetting (HBI)
Easy to handle, transport and ship
Only possible with gas based DRI
In most cases charging to EAF via scrap buckets
3rd India International DRI Summit, Aug 2016
18
19. Comparison of operating results
EAF A EAF B EAF C
Coal based Gas based Gas based
1 bucket charge 1 bucket charge 100 % DRI
Production details
Heats per day [1] 20 27 29
Daily production [tons/day] 1460 2260 2416
Average tap weight [tons] 74.6 83.7 83.3
DRI ratio [%] 51.2 84.1 99.4
100 % DRI heat [1] 0 6 28
EAF yield [%] 85.0 91.5 91.5
Time balance
Power on [min] 50.7 42.8 39.6
Turnaround [min] 7 10.4 8.5
Delays [min] 13.2 2.8 2.9
Tap-to-tap time [min] 70.9 56 51
Time utilization [%] 71.5 76.4 77.6
Plant utilization [%] 95.4 95.1 97.1
Consumption figures
Energy [kWh/t] 671 548 500
Oxygen [Nm³/t] 23.7 14.0 32.5
Tap C [%] 0.05 0.12 0.12
Tap O2 [ppm] 650 348 341
Foaming carbon [kg/t] 5.5 5.0 15.0
Electrodes [kg/t] 2.10 1.45 1.35 19
20. Comparison of operating results
EAF A EAF B EAF C
Coal based Gas based Gas based
1 bucket charge 1 bucket charge 100 % DRI
DRI Quality
Iron ore blending ratio [%] Sishen = 100 LKAB = 50 LKAB = 35
[%] GIIC = 20 GIIC = 30
[%] Others = bal. Others = bal.
Metallization [%] 91.5 95.8 96.3
Carbon [%] 0.1 1.9 2.7
Total gangue [%] 6.5 3.8 3.8
Basicity of DRI gangue [1] 0.05 0.77 0.64
Slag analysis and control
Average FeO [%] 28.0 24.9 21.0
Average MgO [%] 13.0 15.8 18.5
Slag basicity [1] 1.8 2.0 1.8
Consumption figures
Energy [kWh/t] 671 548 500
Oxygen [Nm³/t] 23.7 14.0 32.5
Tap C [%] 0.05 0.12 0.12
Tap O2 [ppm] 650 348 341
Foaming carbon [kg/t] 5.5 5.0 15.0
Electrodes [kg/t] 2.10 1.45 1.3520
21. Compared to coal based DRI the following has been observed:
Higher and consistent metallisation
Beneficial for energy consumption
Lower total gangue with less SiO2 and higher basic
components
High basicity is beneficial for energy consumption
Continuous carbon boil results in lower nitrogen and
hydrogen levels
High carbon content in DRI is beneficial for chemical heating
(up to 35 Nm³/t O2)
Operating experience with gas based DRI
from Midrex plant
3rd India International DRI Summit, Aug 2016
21
22. DRI – Quality parameters
1. Gangue in iron ore feed material
This is the largest factor and depends solely on the quality of the iron ore (cannot be influenced in
DRI-plant)
• Fe total of iron ore – the higher the better
• Total gangue and composition of gangue
There is a large difference between acid/basic/neutral gangue which will influence steelmaking to
a large degree.
Since EAF-steelmaking requires a basic slag of 1.6 – 1.8 (CaO/SiO2) for phosphorus removal and
12~14% MgO for protection of refractories, substantial flux additions are required with lower
quality ore.
Higher acid gangue ore will reduce Fe-yield and increase melting time and energy/electrode
consumptions because of additions of nearly twice the volume of lime/dololime, which needs to
be melted and is lost.
2. Degree of Metallization
Second most important parameter – the higher the better.
Qatar Steel aims to produce highly metallized DRI for use in steelplant because of downstream
benefits regarding yield, energy, electrode and refractory consumption (95.5 – 96.5%)
3. Carbon in DRI
Third most important factor – between 2.5-3.0% depending on oxygen usage
Carbon is in form of iron carbide (Fe3C) which is exothermic when combined with oxygen,
supplying additional chemical energy
Some carbon is used up to reduce remaining FeO in DRI, remaining carbon available for oxygen
blowing.
Contributes to continuous CO – boil, good foaming of slag and low nitrogen/hydrogen in steel.
3rd India International DRI Summit, Aug 2016
There are three main quality aspects that have largest influence on steelmaking
productivity/conversion costs.
22
23. Effect of DRI Metallization on Melting Power
(QS BOP 2004)
+ 1% Metallization will result in + 15 kWh/ton of melting power. This will change to +20 Kwh/t when the
Metallization goes below 94%
3rd India International DRI Summit, Aug 2016 23
24. Effect of DRI Metallization on Electrode
Consumption
+ 1% Metallization will result in + 0.07Kg/ton to 0.12Kg/t of electrode consumption. The consumption goes
higher when the Metallization goes below 94%
3rd India International DRI Summit, Aug 2016 24
25. Effect of DRI Metallization on Power on Time
+ 1% Metallization will result in + 2~3 minutes per heat power on time.
3rd India International DRI Summit, Aug 2016 25
26. Effect of DRI Acid Gangue on Melting Power
+ 0.5% Acid gangue in DRI result in approximately + 20 Kwh/t melting power in EF
3rd India International DRI Summit, Aug 2016 26
27. Effect of DRI Acid Gangue on Electrode
Consumption
+ 0.5% Acid gangue in DRI result in + 0.09 kg/t Electrode consumption in EF
3rd India International DRI Summit, Aug 2016
27
28. Effect of DRI Acid Gangue on Power On Time
+ 0.5% Acid gangue in DRI result in approximately + 2~4 minutes of Power On time
3rd India International DRI Summit, Aug 2016
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29. Advantages of 100% DRI- Heats with Liquid Heel
• No opening of roof for charging a bucket (reduce heat losses)
• Faster Turnaround after tapping to start next heat
• Much smoother melting when starting on higher liquid heel
With liquid heel start-up, stable arc is established within short time – Higher Cos Phi
• Improved Foaming of slag right from start – Higher O2
This allows to increase power level faster – Less Power On time
• Reduced Refractory consumption
Refractories are protected all the time by foamy slag and will last longer with more
even wear.
• No electrode breakages due to scrap cave-in or too slow electrode
regulation.
• Much less stresses on mechanical equipment with less wear and tear
because electrodes hardly move up and down
• Less electrical flicker disturbances on supply line
• No damage to water cooled panels in side walls/roof due to arcing,
backflash etc.
• Much easier power program, only variable is DRI quality and liquid heel.
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30. Advantages of 100% DRI- Heats with Liquid Heel
• Lower electric energy consumption
Because roof is not opened in between heats, and turn-around time after tapping is
much shorter
Arc is better protected in foamy slag which increases effective power input and
reduces radiation losses.
Higher Time Utilization and less power-off times/ delays
Higher productivity (t/h)
• Lower electrode consumption
Less side oxidation because electrodes are two thirds under roof within a CO-rich
reducing atmosphere
Electrodes are less exposed to mechanical stresses with up and down movements,
Arc length can be increased during continuous feeding of DRI because of excellent
foaming.
• Better prediction and more constant Tap to Tap times which makes
planning of downstream LF and CCM easier.
• Increase in Roof delta life
Less radiation from open arcs during initial melting of scrap and better foamy slag
• Lower average Nitrogen levels
Because there is continuous carbon boil from beginning and foamy slag protection,
no open arc melting.
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31. Care to be Taken with 100% DRI & Heel
• Liquid heel must be larger, can be as much as 40% of tapping weight, but
the distance between burner and steel level is to be taken care of.
• Selection of Oxy Jets - Must be effective in early stages because of larger
distance to lower bath level( For Supersonic & Coherent flow effect)
• DRI feeding to be controlled carefully not to over heat or cool down liquid
heel especially start up after tapping.
• As the wall life increases the Hot Heel can be increased by another 5 tons
• Furnace to be tilted 3O Tap side till 50% of DRI feed to retain slag(less flux)
• Temp through wall by Laser is helpful tool to have closed door operation.
• When the liquid heel is increased by lowering the hearth thickness, the
bottom shell temperature to be monitored for a few refractory campaigns
3rd India International DRI Summit, Aug 2016
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32. Carbon in DRI, Hot Heel & Foamy Slag
• For Cold DRI melting EAF, the Content as high as 3% is favorable. But for
Hot DRI 2.5% is optimum, since there is limit for the decarburization rate
for safe DRI melting operation.
• Decarburization rate is measured as CO generation in steel bath which is
12CO Nm3/min/m2 max. This results in Carbon reduction of 300kg/h/m2
• The max carbon in DRI to be calculated, considering the time required for
decarburization in particular designed EAF and the “power on” time.
Decarburization time must not be larger than the ‘Power On” time.
• Liquid hot heel can be around 40% of Tapping weight which will enable
faster arc stabilization, faster Foamy slag generation and quick start of
Oxygen/Carbon injection resulting in shorter Power On times.
• Good foamy slag will help in submerging the arc in the bath, reduce
refractory erosion, increase Cos phi, facilitates higher power input,
thereby reduces the Tap to Tap time
• Slag sample once a shift will have better control over the slag chemistry
3rd India International DRI Summit, Aug 2016 32
33. 33
3rd India International DRI Summit, Aug 2016
Why of Foamy Slag
Important Note: When energy is not transferred to the steel, it is either goes to furnace
wall refractory and panels or to the offgas
35. Benefits of Slag on furnace operation
Shorter tap to tap times
Better heat transfer to the load & less losses to the w/c panels,
protection of the refractory
Higher average power input
Lower electrode consumption
Lower currents
Shorter tap to tap times
Cleaner steel
Removal of Nitrogen & Hydrogen due to gas bubbling (CO)
Pick up / absorption of Oxides in the slag
Removal of inclusions
Phosphor & Sulphur removal
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36. Efficiency = 35% Steel 0% Slag
Efficiency = 90% 100% Slag
Efficiency = 60% 50% Slag
Efficiency of electric energy transfer with foaming slag
3rd India International DRI Summit, Aug 2016 36
37. The Gas:
Depending on the (literature) source, the oxidation of Iron in the bath & the
subsequent reduction of the Iron-Oxide in the slag by Carbon according to
O2 + 2 Fe = 2 (FeO) and (FeO) + C = Fe + COgaseous
is considered the main contributing factor for foaming or the direct Oxidation of
Carbon in the bath is also taken into account :
3rd India International DRI Summit, Aug 2016 37
38. Effective Viscosity ( e)
Fully Liquid "Creamy" to "fluffy" "Fluffy" to "Crusty"
Liquidus
Boundary
Optimum
Slag
Over-
Saturated:
Too much
second phase
particles
Foaming
Index
()
[G]
Slag foamability (continued):
This means that these "optimum" slags are not completely liquid
("watery") but are saturated with respect to CaO (Ca2SiO4)
and/or MgO (Magnesia -wustite solid solution). These second
phase particles serve as gas nucleation sites, which lead to a
high amount of favourable small gas bubbles in the foaming
slag.
The term effective
viscosity was defined
to relate the amount of
second phase particles
in the slag and
viscosity as follows:
e = (1 –1.35 )-5/2
e - effective viscosity of the slag -
viscosity of the molten slag -
fraction of precipitated solid phases
3rd India International DRI Summit, Aug 2016 38
41. QSC - DR Modules
Direct Reduction Plant – Qatar Steel
3rd India International DRI Summit, Aug 2016
SULB DR Module
Cold DRI
41
42. Qatar Steel EAF #4 Commissioned in 2007
Design Details
Furnace Type 80 EBT -Danieli
Nominal steel capacity 80 t
Holding capacity 100 t (Increased to 115 tons)
Shell diameter 6.1 M
Transformer rating 78 MVA
Primary voltage 33 kV
Tap to tap time 45 mins per charge (Design 56’)
Charge mix 10% scrap+90% DRI or 100% DRI
Hot heel Design 20t, increased to 35t
Electrode dia 600 mm
Power on time 37 min
Oxygen 34Nm3/t
Injection carbon 18kg/t
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43. 3rd India International DRI Summit, Aug 2016
EF4 Designed 3 Layer Bottom Bricks for 20 t Hot heel
43
44. 3rd India International DRI Summit, Aug 2016
Modified 2 Layer bottom Bricks for 35 ton Hot heel
(Bottom shell temp monitored initially)
44
45. Arc Stability: SBR & Liquid Heel
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46. Effect of Hot Heel on EAF Parameters
(Qatar Steel EF4:Tap weight 80 tons)
Items 20t Hot heel 35t Hot heel
( 500 heats) (500 heats)
Power On time(min) 39 37
Power Off time(min) 9 8
Melting Power Kwh/t 495 485
O2 consumption(Nm3
/t) 32 34
Electrode Kg/t 1.3 1.07
Gunning Kg/t 2.1 1.64
Fettling Kg/t 0.76 0.61
Bottom material Kg/t 0.34 0.305
Roof Kg/t 0.2 0.24
Wall Kg/t 0.58 0.46
Average Lime
Consumption is
15Kg/t and
Dololime 25 kg/t
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47. Hot Heel Performance in Plant “A” in KSA
(Tap weight 140 tons & 150 MVA Trafo)
Items
Power On time(min) 57 48 40% scrap(2 B)
Power Off time(min) 25 19 various reasons
Melting Power Kwh/t 630 540 High quantity Fluxes
O2 consumption(Nm3
/t) 10 25 3 x 2200Nm3
/hr
Carbon injection Kg/t 5 18 3 x 22Kg/min
Lump Coke Kg/t 0 12
Tapping Carbon % 0.04 0.12
FeO in Slag % 35~45 25~30
50t Hot heel
(Feb 2014)
Bottom stamping
height reduced by
55mm
30t Hot heel
(Jan 2014)
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48. Furnace #5 Commissioned in Feb 2014
EAF Design Details
Nominal steel capacity 110 t –SVAI EOBT
Holding capacity 150 t
Transformer rating 125 MVA
Shell diameter 6600/6500mm
Tap to tap time 44 mins per charge with cold DRI
Charge mix 80% DRI(50%) or 100% DRI(50%)
Hot heel 40t, increased to 45 tons
Electrode dia 600 mm
Power on time 36 min
Oxygen 37Nm3/t
Productivity (tons per hour) 150 tons per hour with cold DRI
Annual Production 1,200,000 t/y (Cold DRI)
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49. DRI Performance in Middle Eastern Plants
Item QS Cold DRI Hot DRI
(Benchmark)
Sulb Future
Target
DRI Metzn 95.5% >95% >95%
Acid gangue 2.7% 2.9% <3.0%
Carbon 2.8% 2.1% 2.5%
DRI Ratio 80 or 100% 100% 100%
DRI Temp oC 30 ~ 45 600 600
Power On (min/ ch) 37 (64.5MW) 34.0(103.3MW) 31.6 (95MW)
Power Off(min/ ch) 8 10.5 8.0
Tap to Tap(min/ ch) 45 44.5 39.6
Melting Kwh/t 485 385 385
Tap weight(t) 82 152 130
Oxygen Nm3/t 34 34.8 32
Carbon Kg/t 18 13 10~15
Electrode Kg/t 1.07 0.8 <1.0
Transformer 78 MVA 130 MVA 120 MVA (?)
3rd India International DRI Summit, Aug 2016 49
50. Future for 100% DRI Operation
• Optimization of Process – Consistency & Reproducibility
• Material recovery – Yield with Improved aux equipment design – Oxygen
injectors, Burners, Flux injectors, foamy slag injectors, temp/oxy probes
• Closed door operation to retain slag & minimize fluxes, minimize air
ingress into furnace & door cleaning equipment without loosing time.
• Further reduction of turnaround time – power on during tap and EBT
maintenance with power on. Gunning robots will reduce repair times
• Furnace bottom shell designed for high hot heel to reduce tap to tap time
• Technology for hot heel measurement & Off gas measurement online
• MIDREX has to develop high C% DRI which will reduce cost in Meltshop
• Good Operator training tools
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51. INDIAN STEEL INDUSTRY-Challenges
• DRI is the preferred raw material for special steels
• By 2020 the projected steel production is 180 million tons, 2nd to China
• 60% BF-BOF, 33% DRI-EF/IF & 7% other routes.
• Iron ore & Coal together make up 72% of Input material
• The increase in cost of input materials is a great challenge
• There is shortage of good quality Iron ore & shortage of non coking coal
• Inadequate supply of natural gas
• Poor infrastructure & transport facilities
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52. INDIAN STEEL INDUSTRY-Challenges
• It is favorable to adopt DRI-BF-EAF route, Rotary hearth Furnaces &
vertical shaft furnaces to produce DRI in India
• Gas based DR Plant in India is uneconomical with the present prices
• Extensive use of hot metal will reduce expensive Electricity consumption
• New technologies provide alternatives for NG & Metallurgical Coke.
• DR Plants – Midrex & HYL (Energiron), Corex, Finex, Hismelt,
Fastmelt/Fastmet & ITmk3 are a few examples favorable for India as they
can utilize lower quality input materials.
• Use of COG as reducing gas in DR Plants is an alternative like JSW &
JSPL
• Alternative fuels like Syn-gas, CBM, Shale gas, Corex export gas & coke
oven gas are good options & cost effective
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53. INDIAN STEEL INDUSTRY-Challenges
• Shale gas scenario, total CBM reserve & UCG are future hope for gas
based DRI Plants. Use of indigenous high ash, low rank non coking coal
for syn gas is a cost effective measure.
• Beneficiation and agglomeration of input materials is the need of the
hour
• Use of 40 to 50% hot metal will reduce power consumption below
380Kwh/tls
• Coke consumption to be reached below 300 kg/t of hot metal. Recent
innovations adopted in coke making at Tata Steel has reduced cost,
increased productivity and environment friendly.
• Adoption of latest technologies in all aspects of
production facilities will cut down cost considerably.
• Tata Steel, JSPL Angul, JSW Ispat and ESSAR
are good example to follow
3rd India International DRI Summit, Aug 2016 53
54. CONCLUSION - i
• Lurgi Gasification technology with Midrex
Direct Reduction Process is a viable solution in
India due to:
• Uses well-proven Lurgi Gasification and
Rectisol® technologies.
• The Lurgi Gasifier can readily use the low rank,
high ash domestic Indian coals as feed
material.
• Uses well-proven Midrex direct reduction
process. This technology can readily use
domestic Indian iron oxides as feed material.
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55. CONCLUSION - ii
• Produces DRI with quality comparable to
natural gas-based Midrex plants
• The DRI can be hot charged into a nearby EAF
to significantly reduce electricity requirement
and significantly increase EAF productivity.
• The Lurgi Gasification plant + Midrex plant
combination can be paired with an EAF- based
minimill to produce high quality long or flat
steel products.
• No coke, coke ovens, or sinter plant required.
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56. CONCLUSION - iii
• Lower specific capital cost than BF –
BOF Plants
• Lower air emissions than integrated
plants
• Ability to capture high purity CO2
• Much larger capacity than Rotary
kilns(~2.5MT)
• Higher quality DRI product than
rotary kilns
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57. 3rd India International DRI Summit, Aug 2016
New Technologies
to
Improve Productivity and Cost
in
DRI-EAF
57
58. Gunning Robot in Operation
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58
59. Overview of the Gunning Robot
3rd India International DRI Summit, Aug 2016 59
60. Laser Measurement of Furnace Wall
3rd India International DRI Summit, Aug 2016
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62. Item Before Robot After Robot Remarks
Wall Ref Life 275 heats in 2004 1215 heats in 2014 March 2014
Wall Ref Kg/t 0.96 kg/tls 0.28 kg/t
Cost of Ref
(Gunning, fettling &
Bottom)
*US$ 3.64/t US$ 2.17/t *RHI Contract
EF turnaround 14 mins/heat 8 mins/heat
Results
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63. Other Benefits
1. The exact thickness of bricks in EF is available
2. Turnaround time is less due to high discharge rate and
precise area of repair, thanks to laser scanner
3. Wall brick erosion is maintained uniform
4. The hot heel can be estimated and compared to eye
estimation
5. EAF Safety as the sudden breakout of metal is eliminated
6. Relaxed operation for the Operator.
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64. On line Temp - principle
3rd India International DRI Summit, Aug 2016
Burner
Flame
Supersonic Oxygen /
Inert Gas Stream
Water Cooled
RCB
Oxygen /
Inert Gas
Optical
Sensor
Gas / Oxy
Online Temperature through the Wall
The system can be used as burner, O2 injector and
temperature measurement
64
65. Good reasons for Adoption-1
Reliable and accurate measurement
- Same precise temperature measurement → Due to continuous temperature measurement
than with standard cartridges.
- No pieces in movement → The sensory devices have a longer service life
- The Temp lance is completely → Accessible, easy-to-maintain
sheltered in the water cooled and protected measurement place
modular injection panel
→ No scrap damages are possible
during scrap basket charging
- Reduction of wrong → Fast and precise measurement
temperature measurements
3rd India International DRI Summit, Aug 2016
66. Good reasons for Adoption-2
Increased productivity
The system is sampling under power
The right time for tapping can be determined more precisely
Faster temperature measurements results are achieved
Very short time in between two consecutive measurements are
possible
Safety improvements
Elimination of hard physical and dangerous works
Measurements may be performed during arcing
- with closed slag door
- avoiding the dangerous flaming out through slag door
due to scrap collapsing, heavy chemical reactions
No additional space consuming device in front of the EAF is
requested
3rd India International DRI Summit, Aug 2016
67. Good Reasons for Adoption-3
Profitable investment
Extreme short ROI
Low installation costs
Short implementation time
Installation during regular maintenance shutdown
Cost reduction
Elimination of temperature cartridge cost
Reduction of personnel cost & Manipulator Maintenance cost
Energy saving thanks to closed door operation
Averaged reduced tapping temperature
Shorter Tap to Tap time and higher productivity
3rd India International DRI Summit, Aug 2016
68. 68
Tires Charging in DRI Melting EAF
1.Environmental Considerations of
disposal problem of used tires in
Qatar
2.To use scrap tires as a source of
chemical energy & charge carbon
3.Recovery of carbon, energy and
the steel in tires.
OBJECTIVE
77. April 2010
THANK YOU
3rd India International DRI Summit, Aug 2016
Special thanks to:
1. Yousef Q Al Emadi, Qatar Steel
2. Bernd Strohmeier of Strohmeier Consulting
3. Jeremy T. Jones & Ms. Sarah Anderson (USA)
4. Said Alameddine of Graftec & now at Sangraf
5. Amit Chatterjee, Deependra & Chinmoy from India