This document describes advanced industrial control of a tunnel kiln brick production process using fuzzy-model predictive control. It discusses a case study of two-level control at a brick factory, with task-oriented control at the human operator level and model predictive control at the regulation level. Fuzzy control is also involved based on product quality control. The control system was simulated in MATLAB Simulink on a model of a tunnel kiln at a brick factory in Kumanovo, Macedonia. The intelligent automation provided by this control system can save energy and costs.
Study of mechanical properties of concrete at elevated temperatures a revieweSAT Journals
Abstract Concrete, the second highest consumed material after water in the world, plays a vital role in the construction field because of the versatility in its use. Developments during the last two decades have shown a marked increase in the number of structures involving the long time heating of concrete. In recognition of its importance, many researchers have attempted to investigate the effect of elevated temperature on mechanical properties of concrete. These researchers, during their investigation, used materials with varying combination and different experimental conditions. These materials include cement, different percentages of admixtures like fly ash, silica fume, metakaolin, finely grounded pumice(FGP), group granulated blast furnace slag(GGBS), polypropylene fibre(PP fibre), palm oil fuel ash(POFA), Portland pozzolana cement(PPC), rice husk ash(RHA), different fine and coarse aggregates, super plasticisers, retarders and the conditions included a temperature range of 28oC to 1200oC . The other conditions that were varied are the shapes and sizes of test specimens, curing methods, curing conditions and test methods. The analysis of these investigations and their results are reviewed and presented in this paper. Key words: concrete, mechanical properties, elevated temperature, admixtures, curing methods
Study of mechanical properties of concrete at elevated temperatures a revieweSAT Journals
Abstract Concrete, the second highest consumed material after water in the world, plays a vital role in the construction field because of the versatility in its use. Developments during the last two decades have shown a marked increase in the number of structures involving the long time heating of concrete. In recognition of its importance, many researchers have attempted to investigate the effect of elevated temperature on mechanical properties of concrete. These researchers, during their investigation, used materials with varying combination and different experimental conditions. These materials include cement, different percentages of admixtures like fly ash, silica fume, metakaolin, finely grounded pumice(FGP), group granulated blast furnace slag(GGBS), polypropylene fibre(PP fibre), palm oil fuel ash(POFA), Portland pozzolana cement(PPC), rice husk ash(RHA), different fine and coarse aggregates, super plasticisers, retarders and the conditions included a temperature range of 28oC to 1200oC . The other conditions that were varied are the shapes and sizes of test specimens, curing methods, curing conditions and test methods. The analysis of these investigations and their results are reviewed and presented in this paper. Key words: concrete, mechanical properties, elevated temperature, admixtures, curing methods
IJRET : International Journal of Research in Engineering and TechnologyCompar...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Experimental Study on Partial Replacement of Cement by Flyash and GGBSijsrd.com
This paper presents a laboratory investigation on optimum level of Fly ash and Ground Granulated Blast Furnace Slag (GGBS) as a partial replacement of cement to study the strength characteristics of concrete. Portland cement was partially replaced by 5%, 6%, 7%, 8%, 9%, 10% of GGBS and Fly ash by 20%, 40%, 60% respectively. The water to cementations materials ratio was maintained at 0.45 for all mixes. The strength characteristics of the concrete were evaluated by conducting Compressive strength test, Splitting Tensile strength test and Flexural strength test. The compression strength test were conducted for 7days and 28days of curing and split tensile strength test and flexural strength test were conducted for 28days of curing on a M25 grade concrete. The mix proportion M25 was found to be 1:1.36:2.71.The test results proved that the compressive strength, split tensile strength and flexural strength of concrete mixtures containing GGBS and Fly ash increases as the amount of GGBS and Fly ash increase. After an optimum point, at around 9% of GGBS and 40% of Fly ash of the total binder content, the further addition of GGBS and fly ash does not improve the compressive strength, split tensile strength and flexural strength.
RESIDUAL COMPRESSIVE STRENGTH OF TERNARY BLENDED CONCRETE AT ELEVATED TEMPERA...Ijripublishers Ijri
The extensive use of concrete as a structural material for the high rise buildings, storage tanks, nuclear reactors and
pressure vessels increase the risk of concrete being exposed to high temperatures. This has led to a demand to improve
the understanding of the effect of temperature on concrete. The behavior of concrete exposed to high temperature is a
result of many factors including the exposed environment and constituent materials.
Concrete structures are exposed to fire when a fire accident occurs. Damage in concrete structures due to fire depends
to a great extent on the intensity and duration of fire. The distress in the concrete manifests in the form of cracking and
spalling of the concrete surface.
COMPARATIVE ANALYSIS OF CHEMICAL AND PHYSICAL PROPERTIES OF MINI CEMENT PLANT...Journal For Research
This research is about analyzing the chemical and physical characteristics of cement and concrete. Cement can be classified based on its chemical properties. The sample taken for this research work is Kamal OPC 53 grade mini cement plant and Ultratech OPC 53 grade major cement plant. The difference can be analyzed by determining the chemical composition of the cement and its effect on physical properties of cement and concrete. Secondly, it is not necessary that in every structural member of a building, the cement used needs to be same. To determine that which cement is more suitable for which structural element this analysis is beneficial. Again, if any new type of admixture needs to be introduced in the concrete, it is important to understand the chemical composition of cement and how the new admixture may react with the cement. Also, this research is about how the changes in chemical composition of cement affect the physical properties of cement and concrete. It is noticed that due to lack in standardization of cement, even the same sample of cement gives different result.
It consists of required concrete ingredients such as Cement, Fine Aggregate, coarse aggregate and water. Steps to reduce carbon footprint,Hydration of cement and M-sand introduction.
Methodology of some items of construction works are summarized as power point presentation under various heading as stated in summery part. The power point presentation is based on The CPWD Specifications being published by CPWD as CPWD SPECIFICATIONS (VOL. 1) and (VOL. 1) 2009. This is very comprehensive and useful in execution of works and are used as guide by a number of Engineering Departments. The power point presentations are very useful for students and engineers to understand specifications, standards and methodology for building materials, guidelines for execution of works, measurements and rates.
AN EXPERIMENTAL STUDY ON PROPERTIES OF TERNARY BLENDED CONCRETE USING GGBS AN...AM Publications
Ground granulated blast furnace slag (GGBS) is a by-product obtained from the blast furnaces used in the iron manufacturing industry. The disposal of the marble powder obtained from marble industry constitutes one of the environmental problems around the world. One of the possible solutions for the effective use of GGBS and marble powder is to partially replace cement in concrete. This paper presents the results of an experimental study on concrete in which the cement is partially replaced by both GGBS and marble powder. In this study, different percentages of GGBS and marble powder are used for partial replacement of cement by 30%. Tests conducted includes workability of fresh concrete (Slump test), strength of hardened concrete (Compressive strength, Split tensile strength and Flexural strength) and durability properties of concrete (Chloride resistance and Sulphate resistance).
Characterization and boriding kinetics of aisi t1 steeluaeh
Boriding is a thermochemical treatment in which boron atoms are diffused into the surface of a workpiece and form borides with the base metal. Apart from constructional materials, which meet these high demands, processes have been developed which have a positive effect on the tribological applications including abrasive, adhesive, fatigue and corrosion wear of the component surface.
TƯ VẤN CHUYỂN GIAO CÔNG NGHỆ ROBOT XẾP GẠCH VÀ LÒ TUYNEL ĐI ĐỘNG
Tư vấn cấp, chuyển đổi và xây mới dự án nhà máy sản xuất gạch tuynel bằng công nghệ mới nhất. Sử dụng hệ thống robot xếp gạch và hệ thồng lò xoay di động tiên tiến nhất hiện này.
Đi đầu về chuyển giao công nghệ robot xếp gạch và công nghệ lò xoay di động tuynel tại Việt Nam
Cam kết mang lại cho khách hàng- chủ đầu tư công nghệ mới nhất, thiết kế mới nhất, hiệu quả đầu tư cao nhất, dịch vụ sau bán hàng tốt nhất
Cam kết bảo hành, bảo trì, cung cấp thiết bị chính hãng 24/7 trên khắp Việt Nam. Cung cấp và xử lý các sự cố bảo hành trong vòng 24h với đội ngũ kỹ thuật lành nghề
QUÝ KHÁCH QUAN TÂM ĐẦU TƯ MỚI HOẶC NÂNG CẤP CHUYỂN ĐỔI SANG CÔNG NGHỆ TUYNEl
LIÊN HỆ TƯ VẤN NGAY HOẶC ĐỂ LẠI SỐ ĐIỆN THOẠI CHÚNG TÔI SẼ GỌI LẠI NGAY!!!
CTY TNHH CHUYỂN GIAO CÔNG NGHỆ VÀ THIẾT BỊ H.I.S
Hotline:0989.382.888-0926.73.6886
DC: Thanh Xuân, Hà Đông, Hà Nội
Web:robotxepgach.com
Mail:huy.robotxepgach@gmail.com
Face:facebook.com/robotxepgach
Computation of Theoretical Heat of Formation in a Kiln Using Fortran LanguageIOSR Journals
Abstract: The evolution of the early rotary kiln for cement industries and innovation made by man is to ease
cement processing. The rotary Kiln in which cement is burnt at 13000C to 15500C is a long cylinder rotating on
its axis and inclined so that the materials fed in at the upper end travel slowly to the lower end.
The approach adopted is by evolving a mathematical model of the system. Simulation of the process was carried
out using FORTRAN language to compute theoretical heat of formation. The exact value of theoretical heat of
formation was found to be 435.583000.
The aim is to produce a good quality clinker at the optimum fuel consumption and thermal efficiency.
The computer model is in a FORTRAN language. The simulation provides very encouraging result, which
showed trends that enabled the deduction of optimum system parameters.
Significance: This paper investigated the behavior of the kiln through computer simulations, for comparing
the performance of different constitutions under similar operations and conditions. The paper highlighted how a
good quality clinker can be produced at optimum fuel consumption and thermal efficiency.
IJRET : International Journal of Research in Engineering and TechnologyCompar...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Experimental Study on Partial Replacement of Cement by Flyash and GGBSijsrd.com
This paper presents a laboratory investigation on optimum level of Fly ash and Ground Granulated Blast Furnace Slag (GGBS) as a partial replacement of cement to study the strength characteristics of concrete. Portland cement was partially replaced by 5%, 6%, 7%, 8%, 9%, 10% of GGBS and Fly ash by 20%, 40%, 60% respectively. The water to cementations materials ratio was maintained at 0.45 for all mixes. The strength characteristics of the concrete were evaluated by conducting Compressive strength test, Splitting Tensile strength test and Flexural strength test. The compression strength test were conducted for 7days and 28days of curing and split tensile strength test and flexural strength test were conducted for 28days of curing on a M25 grade concrete. The mix proportion M25 was found to be 1:1.36:2.71.The test results proved that the compressive strength, split tensile strength and flexural strength of concrete mixtures containing GGBS and Fly ash increases as the amount of GGBS and Fly ash increase. After an optimum point, at around 9% of GGBS and 40% of Fly ash of the total binder content, the further addition of GGBS and fly ash does not improve the compressive strength, split tensile strength and flexural strength.
RESIDUAL COMPRESSIVE STRENGTH OF TERNARY BLENDED CONCRETE AT ELEVATED TEMPERA...Ijripublishers Ijri
The extensive use of concrete as a structural material for the high rise buildings, storage tanks, nuclear reactors and
pressure vessels increase the risk of concrete being exposed to high temperatures. This has led to a demand to improve
the understanding of the effect of temperature on concrete. The behavior of concrete exposed to high temperature is a
result of many factors including the exposed environment and constituent materials.
Concrete structures are exposed to fire when a fire accident occurs. Damage in concrete structures due to fire depends
to a great extent on the intensity and duration of fire. The distress in the concrete manifests in the form of cracking and
spalling of the concrete surface.
COMPARATIVE ANALYSIS OF CHEMICAL AND PHYSICAL PROPERTIES OF MINI CEMENT PLANT...Journal For Research
This research is about analyzing the chemical and physical characteristics of cement and concrete. Cement can be classified based on its chemical properties. The sample taken for this research work is Kamal OPC 53 grade mini cement plant and Ultratech OPC 53 grade major cement plant. The difference can be analyzed by determining the chemical composition of the cement and its effect on physical properties of cement and concrete. Secondly, it is not necessary that in every structural member of a building, the cement used needs to be same. To determine that which cement is more suitable for which structural element this analysis is beneficial. Again, if any new type of admixture needs to be introduced in the concrete, it is important to understand the chemical composition of cement and how the new admixture may react with the cement. Also, this research is about how the changes in chemical composition of cement affect the physical properties of cement and concrete. It is noticed that due to lack in standardization of cement, even the same sample of cement gives different result.
It consists of required concrete ingredients such as Cement, Fine Aggregate, coarse aggregate and water. Steps to reduce carbon footprint,Hydration of cement and M-sand introduction.
Methodology of some items of construction works are summarized as power point presentation under various heading as stated in summery part. The power point presentation is based on The CPWD Specifications being published by CPWD as CPWD SPECIFICATIONS (VOL. 1) and (VOL. 1) 2009. This is very comprehensive and useful in execution of works and are used as guide by a number of Engineering Departments. The power point presentations are very useful for students and engineers to understand specifications, standards and methodology for building materials, guidelines for execution of works, measurements and rates.
AN EXPERIMENTAL STUDY ON PROPERTIES OF TERNARY BLENDED CONCRETE USING GGBS AN...AM Publications
Ground granulated blast furnace slag (GGBS) is a by-product obtained from the blast furnaces used in the iron manufacturing industry. The disposal of the marble powder obtained from marble industry constitutes one of the environmental problems around the world. One of the possible solutions for the effective use of GGBS and marble powder is to partially replace cement in concrete. This paper presents the results of an experimental study on concrete in which the cement is partially replaced by both GGBS and marble powder. In this study, different percentages of GGBS and marble powder are used for partial replacement of cement by 30%. Tests conducted includes workability of fresh concrete (Slump test), strength of hardened concrete (Compressive strength, Split tensile strength and Flexural strength) and durability properties of concrete (Chloride resistance and Sulphate resistance).
Characterization and boriding kinetics of aisi t1 steeluaeh
Boriding is a thermochemical treatment in which boron atoms are diffused into the surface of a workpiece and form borides with the base metal. Apart from constructional materials, which meet these high demands, processes have been developed which have a positive effect on the tribological applications including abrasive, adhesive, fatigue and corrosion wear of the component surface.
TƯ VẤN CHUYỂN GIAO CÔNG NGHỆ ROBOT XẾP GẠCH VÀ LÒ TUYNEL ĐI ĐỘNG
Tư vấn cấp, chuyển đổi và xây mới dự án nhà máy sản xuất gạch tuynel bằng công nghệ mới nhất. Sử dụng hệ thống robot xếp gạch và hệ thồng lò xoay di động tiên tiến nhất hiện này.
Đi đầu về chuyển giao công nghệ robot xếp gạch và công nghệ lò xoay di động tuynel tại Việt Nam
Cam kết mang lại cho khách hàng- chủ đầu tư công nghệ mới nhất, thiết kế mới nhất, hiệu quả đầu tư cao nhất, dịch vụ sau bán hàng tốt nhất
Cam kết bảo hành, bảo trì, cung cấp thiết bị chính hãng 24/7 trên khắp Việt Nam. Cung cấp và xử lý các sự cố bảo hành trong vòng 24h với đội ngũ kỹ thuật lành nghề
QUÝ KHÁCH QUAN TÂM ĐẦU TƯ MỚI HOẶC NÂNG CẤP CHUYỂN ĐỔI SANG CÔNG NGHỆ TUYNEl
LIÊN HỆ TƯ VẤN NGAY HOẶC ĐỂ LẠI SỐ ĐIỆN THOẠI CHÚNG TÔI SẼ GỌI LẠI NGAY!!!
CTY TNHH CHUYỂN GIAO CÔNG NGHỆ VÀ THIẾT BỊ H.I.S
Hotline:0989.382.888-0926.73.6886
DC: Thanh Xuân, Hà Đông, Hà Nội
Web:robotxepgach.com
Mail:huy.robotxepgach@gmail.com
Face:facebook.com/robotxepgach
Computation of Theoretical Heat of Formation in a Kiln Using Fortran LanguageIOSR Journals
Abstract: The evolution of the early rotary kiln for cement industries and innovation made by man is to ease
cement processing. The rotary Kiln in which cement is burnt at 13000C to 15500C is a long cylinder rotating on
its axis and inclined so that the materials fed in at the upper end travel slowly to the lower end.
The approach adopted is by evolving a mathematical model of the system. Simulation of the process was carried
out using FORTRAN language to compute theoretical heat of formation. The exact value of theoretical heat of
formation was found to be 435.583000.
The aim is to produce a good quality clinker at the optimum fuel consumption and thermal efficiency.
The computer model is in a FORTRAN language. The simulation provides very encouraging result, which
showed trends that enabled the deduction of optimum system parameters.
Significance: This paper investigated the behavior of the kiln through computer simulations, for comparing
the performance of different constitutions under similar operations and conditions. The paper highlighted how a
good quality clinker can be produced at optimum fuel consumption and thermal efficiency.
Lab Vacuum oven is an oven that heats a sample in vacuum. WEIBER vacuum pumps are designed to provide excellent vacuum & temperature performance. Heating in vacuum is important for preventing oxidation and this allows the use of higher temperatures without boiling. The entire heat-treating process can take place under vacuum or precisely controlled atmospheres can be introduced. They are designed and manufactured to suit various I.S. & A.S.T.M. standards application in the growing field of Medical, Agricultural, Industrial, Research laboratories & Hospitals. For more information please visit: http://goo.gl/nr7jNi
Recent advances in semiconductor technology show the improvement of fabrication on
electronics appliances in terms of performance, power density and even the size. This great achievement
however led to some major problems on thermal and heat distribution of the electronic devices. This
thermal problem could reduce the efficiency and reliability of the electronic devices. In order to minimize
this thermal problem, an optimal cooling techniques need to be applied during the operation. There are
various cooling techniques have been used and one of them is passive pin fin heat sink approach. This
paper focuses on inline pin fin heat sink, which use copper material with different shapes of pin fin and a
constant 5.5W heat sources. The simulation model has been formulated using COMSOL Multiphysics
software to stimulate the pin fin design, study the thermal distribution and the maximum heat profile.
Solar thermal control of building integrated phase change materials an experi...eSAT Journals
Abstract
In the present paper, we study experimentally the thermal behavior of phase change material (PCM) for thermal control of indoor
applications. The experimental setup consists of two full scale identical concrete cavities, situated in Faculty of Sciences Aïn
Chock in Casablanca- Morocco (33°36'N, 07°36'W). The first cavity incorporates paraffinic phase change material with melting
temperature of 22 °C and second cavity is built with alveolar bricks. The test cells are equipped by set of thermocouples and heat
flux meters connected to data logger. Thermal analysis for the two cubicles was conducted. The results show that inner
temperature swings decreases remarkably in the cavity with PCM with temperature minima 3 °C upper to the case without PCM.
On the other hand, there is time shift between PCM cavity and the reference cavity temperature oscillations. The integration of the
phase change material on the roof of the building reduces the temperature of internal walls as it has good thermal inertia. When
PCM panel covered the roof, solar heat transmission is reduced. This significantly reduces the ambient temperature of the cell.
This demonstrates the ability of PCM to increase the thermal comfort of buildings.
Keywords: PCM, Thermal Comfort, Building, Passive Solar Heating, Heat Storage. Melting, Solidification
With the KUPOL™ system, additional heating tanks are no longer needed!
The dome-type system of internal heating of bitumen is an improved design of the so-called local heaters, which excludes vacuum compaction and heating of the entire volume of stored bitumen.
chemical industries cement industry rotary Kiln.2023.pdfDimaJawhar
Abstract:
The assignment describes the cement industry's processes. Cement is a fundamental
building and civil engineering material.
the stages of getting Portland cement is Crushing and grinding the raw materials,
combining the components in precise proportions, burning the prepared mix in a kiln,
grinding the burnt result, known as "clinker," a percentage of gypsum (to limit the
period of set of the cement).
Under high temperatures, a rotary kiln is a physically huge process unit used in cement
manufacturing where limestone is degraded into calcium oxide, which forms the base
of cement clinker particles.
Also, the Location of the control parameters and variables is discussed.
Industry of Cement: Rotary Kiln
4
Introduction:
the cement industry is directly tied to the economy of the construction, In 1995, the
European Union produced 172 million tonnes of cement, accounting for nearly 12% of
global output. (European Commission, 2001)
After mining, grinding, and homogenization of raw materials, the first phase in cement
production is the calcination of calcium carbonate, followed by high-temperature
burning of the resultant calcium oxide with silica, alumina, and ferrous oxide to
generate clinker. To make cement, the clinker is crushed or milled with gypsum and
other ingredients. (European Commission,2001)
It is worth noting that cement is one of the most essential building materials in the
world. It is mostly utilized in the production of concrete. Concrete is made up of inert
mineral aggregates like sand, gravel, broken stones, and cement. Cement consumption
and manufacturing are inextricably linked to the construction industry, and
consequently to overall economic activity. Cement is one of the most developed
products in the world, owing to its importance as a construction material and the
geographical availability of the key raw materials, namely limestone. The extensive
development is also attributed to the low cost and high density of cement. Because of
the comparatively high prices, ground transportation is reduced. Export commerce
(excluding plants grown across borders) is often restricted in comparison to global
output. (N. Martin, m. D. Levine, et al,1995)
Referred to Figure 1 process flow diagram of the cement industry is explained There
are four stages in the manufacture of Portland cement:
• crushing and grinding the raw materials
• blending the materials in the correct proportions
• burning the prepared mix in a kiln
• grinding the burned product, known as “clinker,”
• percent of gypsum (to control the time of set of the cement).
The three manufacturing techniques are known as the wet, dry, and semidry processes,
and are so named because the raw materials are ground wet and fed to the kiln as a
Industry of Cement: Rotary Kiln
5
slurry, ground dry and supplied as a dry powder, or ground dry and subsequently
moistened to form nodules that are fed to the kiln. (Thomas o. Mason 2023)
Figure 1: The cement-making process, from raw material
Study On The External Gas-Assisted Mold Temperature Control For Thin Wall Inj...IJERA Editor
Dynamic mold surface temperature control (DMTC) has many advantages in micro-injection molding as well as thin-wall molding product. In this paper, DMTC will be applied for the thin-wall molding part with the observation of the weldline appearance and the weldline strength. The heating step of DMTC will be achieved by the hot air flow directly to the weldline area. The results show that the heating rate could be reached to 4.5C/s, which could raising the mold surface from 30C to over 120C within 15 s. The melt filling was operated with high temperature at the weldline area; therefore, the weldline appearance was eliminated. In addition, the weldline strength was also improved. The results show that the thinner part had the higher strength of the weldline.
ACEP Magazine edition 4th launched on 05.06.2024Rahul
This document provides information about the third edition of the magazine "Sthapatya" published by the Association of Civil Engineers (Practicing) Aurangabad. It includes messages from current and past presidents of ACEP, memories and photos from past ACEP events, information on life time achievement awards given by ACEP, and a technical article on concrete maintenance, repairs and strengthening. The document highlights activities of ACEP and provides a technical educational article for members.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
Using recycled concrete aggregates (RCA) for pavements is crucial to achieving sustainability. Implementing RCA for new pavement can minimize carbon footprint, conserve natural resources, reduce harmful emissions, and lower life cycle costs. Compared to natural aggregate (NA), RCA pavement has fewer comprehensive studies and sustainability assessments.
HEAP SORT ILLUSTRATED WITH HEAPIFY, BUILD HEAP FOR DYNAMIC ARRAYS.
Heap sort is a comparison-based sorting technique based on Binary Heap data structure. It is similar to the selection sort where we first find the minimum element and place the minimum element at the beginning. Repeat the same process for the remaining elements.
KuberTENes Birthday Bash Guadalajara - K8sGPT first impressionsVictor Morales
K8sGPT is a tool that analyzes and diagnoses Kubernetes clusters. This presentation was used to share the requirements and dependencies to deploy K8sGPT in a local environment.
6th International Conference on Machine Learning & Applications (CMLA 2024)ClaraZara1
6th International Conference on Machine Learning & Applications (CMLA 2024) will provide an excellent international forum for sharing knowledge and results in theory, methodology and applications of on Machine Learning & Applications.
2. Exhause hole control
Hot air for
brick dryer
Wagon
output
Wagon
input
Heavy oil input
Wagon TERMINAL
Fan
Cooling zone Firing zone Preheating zone
M
c1
M
c2
M
c3
M
ci -Temperature microcontrolers
Tci -Termocouples
Evi -Electro valves
M
c4
M
c5
M
c6
M
c7
M
c8
M
c9
M
c10
M
c11 M
c12
Tc2
Tc5
EV2
Ev5
Ev4
Ev3 Ev1
Tc10 Tc12
Tc11
Tc9
Tc8
Tc7 Tc6
Tc4 Tc3 Tc1
RS485
RS485/RS322
Fig1 Bricks tunnel kiln with control system
Preheating zone Firing zone Cooling zone
Temperature
[
C]
o
Fig.2 Temperature profile in the tunnel kiln
3. MAIN PRODUCT CHARACTERISTICS
Quality of the products, in our case clay bricks, depends not
only from the process of firing, but also from process of
drying which is before. All the time we suppose that the
process of drying is completely finished, and all defects in the
bricks are results of the process of firing.
Quality assessment is on the bases of next features:
- color of clay bricks
- porous of clay bricks
- deformation of the dimension of clay bricks
- mechanical characteristics (hardness)
Here we will explain these products characteristics:
3.1 Color of clay bricks
The color of the final product, clay-bricks depends of two
factors: chemical composition of clay from which bricks are
made and firing temperature of the firing zone in the kiln.
From the aspect of the chemical composition, bricks color
depends from the quantities of Fe2O3 + FeO (iron oxide), in
the clay mixture. If the percent of the iron oxides is in low
level, bricks color is red if the firing is on 920oC, to dark-red
if the firing is on 1180oC. From the other side, if the percent
of the iron oxides in the clay mixture is in high level, bricks
color is red-yellow if the firing is on 920oC, to olive green if
the firing is on 1180oC. If the temperature in the firing zone is
higher than 1200oC, than bricks color transcends to dark
brown. In that case product (clay-bricks) is overdone. If the
brick satisfy other quality characteristic than only problem is
increasing of energy consummation.
Measuring of the brick color is with unit for color detect,
which give signal from 4-20mA, as a represent of red color.
4mA represent red-yellow and 20mA represent dark red. This
signal goes directly to the analog input of the computer
controller. Frequency of this measuring is ones per every
wagon (10-20 measuring per day, depending from the number
of the wagons).
18th IFAC World Congress (IFAC'11)
Milano (Italy) August 28 - September 2, 2011
10734
3. 3.2 Porosity and water absorption
Porosity is variable which changes depending on the firing
temperature of the clay. Increasing the temperature of firing
over 750o
C, porosity decreases evidently. This results in the
decreasing of ability of water absorption. Well fired product
has water absorption of 8%, and the higher limit is 15%.
Values smaller than 8% are result of very high firing
temperature in the firing zone (over fired product).
Testing of the porosity is in the laboratory, and it happens
ones time per day, and result of this test is enter on the system
directly on the controller also ones time per day, on the
finishing of first shift.
3.3 Deformation in final products
During firing process in the different temperature intervals
linear reducing and linear expanding happens. If final product
swells, the reason is sudden increase of temperature in the
preheating zone of the kiln. Very high temperature in the
firing zone (around 1300 ̊C) results in product melting or
deformation of originally products shape.
Measuring of the dimension of the brick is making manually
from workers on every wagon. The worker enters data for
brick dimension in the computer terminal located on the kiln
outlet.
3.4 Mechanical hardness
One of the main characteristics of fired product is its
mechanical hardness which is incomparable higher than the
one of the nonfired but dried product. Increasing the firing
temperature involves increasing of mechanical hardness. But
the mechanical hardness depends not only of the temperature,
but also from the chemical structure (composition) of the clay
and the way it is shaped.
One of the main parameter for clay brick quality is air flow
across the kiln. It is important not only for product quality,
(product cooling in cooling zone and oxygen entering in the
firing zone) but also for right time removing of waste gas.
Measuring of the mechanical hardness is on the laboratory,
ones time per day, and result of this test is enter on the system
directly on the controller also ones time per day, on the
finishing of first shift.
3.5 Products defects as a result of problems in cooling zone
Biggest problem during bricks firing process is appearance of
micro cracks which are results of the straining as an occasion
of volume changing during phase transformation of free
quartz. On the clay brick can exist one micro crack or whole
network of cracks which lead to product destroying. If on the
product doesn’t exist micro cracks, it give clear sound on the
blow. In opposite it gives dully and unclear sound. Another
way for detection of micro cracks is wetting of the clay bricks.
If the micro cracks exist they clearly are showed as a wet
parts, and rest of brick surface will be dry. One of the main
reasons for micro cracks appearance is taking out too much
quantity of hot air. In that case we have underpression in the
cooling zone, which result in uncontrolled temperature drop in
cooling zone. This problem can be solved with control of the
air flow across main air channel on the exhaust with damper.
3.6 Fuel consummation
One of the main characteristic of thermal processes is fuel
consummation. It is important from the first because final
price of the products direct depend from it. Reducing of fuel
consummation in thermal processes is on the first place for
control engineers. Our goal is products quality improves and
fuel consummation reducing. In the case of “KIK”
Kumanovo tunnel kiln there is one gas flow transmitter
located on the main supplying gas line. It gives 4-20mA
signal which can be used in control system. This signal goes
directly to the control system continually.
4. TWO LEVEL SYSTEM ARCHITECTURE
Clay-bricks production is a critically dependent on the firing
process at the kiln. Existed control systems apply first level
local control, data acquisition and supervision and product
quality is the second stage of the project and here is directly
considered. The ultimate goal is the quality improvement of
the bricks at the kiln output and fuel consummation reduction.
To reach this goal, this application incorporates a two-level
hierarchical control structure: a MPC control to keep the
temperature profile along the kiln as steady as possible, and a
rule-based control which modifies the desired temperature and
pressure profiles along the kiln so as to counter-act quality
defects measured at the kiln output. Both levels interact with a
database and a man-machine interface through a blackboard
based system, where real-time issues have been addressed. On
the other hand, monitoring of variables, treatment of alarms,
data management and man-machine communication are
important issues also considered in the application. An easy
configuration of one two-level control system is incorporated
in KIK Kumanovo Clay-Brick Company (Fig. 1).
The two layers in the control structure (Dimirovski, et al.
2000, Pico et al. 1999, Stankovski, et al. 1998a, d, 2000)
within hierarchical system architecture are:
Upper optimization layer computes the desired references, rk,
for the temperatures at each section along the kiln. These
references are defined with the aim of counteract quality
defects appearing at the bricks. It can be a rule-based control
level, at which different actuation strategies can be defined by
the operator, attending to the defect to be controlled and the
kind of composition of the bricks.
The fuzzy logic sets were defined in our previous work and it
is conventional Mamdani multivariable controller with four
inputs and three outputs. Controller inputs are: product colour,
product dimension, porous, and energy consummation, in our
case gas consummation. Outputs are: temperature profile in
firing zone and damper position.
18th IFAC World Congress (IFAC'11)
Milano (Italy) August 28 - September 2, 2011
10735
4. Executive control layer is aimed to achieve that the actual
temperature be equal to the desired reference at each section,
i.e. yk=rk . To reach this goal, the coordinating control is
model predictive control with decentralized feedback. The
temperature profile in the firing zone is controlled with 6
burners as defined in Section 3. The temperature profile in the
preheating and cooling zones is controlled with hot and cold
air circulation along these sections. For that reason we need
regulate circulation of the through the damper position.
The objectives of this layer are to implement quality control
using model predictive controller. In our previous work
(Stankovski et al. 2005) we have used ON-OFF controllers at
this level combined with decoupling method. Now, when
implementing MPC we do not need to decouple the plant,
because the MPC controller takes into consideration all input-
output interconnections in the system.
The control system architecture is presented on figure 3, and
defines a two level, fuzzy – model predictive controller.
Fig 3. Schematic of the proposed control architecture
5. EXECUTIVE CONTROL LAYER – FIRST LEVEL
WITH MODEL PREDICTIVE CONTROLLER
A basic structure of MPC is presented in Fig 4. The control
input trajectory over the control horizon is determined in the
algorithms on the basis of the model, by minimizing a cost
function. In order to obtain proper results, we must to
incorporate constraints on the system we want to control. The
cost function in general consists of two parts: differences
between the set points and the predicted outputs and is known
as the cost of predicted control errors and the penalties for the
changes of the control value. The most common used
quadratic cost function can be formulated as in (1).
The idea is to use one function not only to minimize the
output errors, but in a way to keep the changes of the control
value at the minimum. The notation in (1) is obvious, and the
control horizon must satisfy the constraints 0 u y
N N
. It is
usually assumed that u y
N N
in order to get decreased
dimensionality of the optimization problem which leads to a
smaller computational load. The value of λ differs depending
on the process that we want to control and determine how big
control change we will allow to be performed at one step of
the algorithm. The predicted control values are obtained with
minimizing the cost function. Nevertheless the quality of
MPC depends mostly on the model for the controlled plant. In
this paper, the model we use has 7 inputs (6 fuel flows into the
burners and damper set point) and 13 outputs (T1-T12 and
damper position). The model structure is presented on Fig 5.
For more on MPC and the MPC industrial applications please
refer to Camacho and Bordons, 2004.
1
2
1
2
0
( ) ( | ) ( | )
( | )
y
u
N
p
p N
N
p
p
J k w k p k y k p k
u k p k
(1)
Fig. 4. Basic structure of MPC
Fig.5 Model structure of the tunnel kiln furnace
The transfer functions between the input/output channels are
in the form: ( / ( 1))
Ts
e A Bs
, where A, B and T are the
parameters to be identified.
18th IFAC World Congress (IFAC'11)
Milano (Italy) August 28 - September 2, 2011
10736
5. Fig 6. Simulink model for the proposed Fuzzy-MPC control architecture
6. SIMULATION RESULTS
In order to achieve good quality control in this study we
combine an automated measurement system, which measures
the colour of the bricks and the fuel consumption, with results
of a laboratory tests done on daily basis. All these parameters
are delivered in normalized form to a fuzzy logic controller
installed on the PC in the operating room. From these
parameters the fuzzy logic controllers derives the optimal
temperature profile for the “firing zone” and the desired
damper position.
We have designed a simulation in MATLAB Simulink (Fig.
6) to confirm that the proposed control architecture has many
advantages over the conventional control of such processes.
The quality control layer dynamically defines the referent
temperature of the firing zone (Fig. 7).
The model was derived with identification with the data from
the real plant. The transfer function for the direct I/O
connections is 1.25
(12 / (0.3 1))
s
e s
. In the MPC algorithm
the weights of the outputs in the firing zone are biggest (value
4 :
9 0.8
) and the weights of the temperatures in the
preheating and cooling zones have lower values
( 1 :
3 10
, :
12 0.3
). This means that the controller will react
more on the errors in the firing zone than on the errors in the
preheating and cooling zones. The set point in firing zone is
set to 970 Celsius degrees,
The results of these simulations are presented on Fig 8 these
results are given into summarized form because there are not
big differences in the grouped signals. It is obvious that the
controller drives the system to the steady state. It has minimal
overshoot which is very important for the quality of the brick
products. The fuel consumption (Fig. 9) is reduced compared
to the data from the real-time operation in the factory.
This algorithm enables the engineer to replace the
conventional decoupling control of MIMO processes with
MPC, which is more intuitive and easier to understand.
Additionally the MPC has “built-in” methods for
compromising the quality of control with the cost of the
control action which is extremely important for industrial
processes with high consumptions of energy.
Fig. 7 Referent value change due to quality control layer
Fig. 8 Simulation results of the two level fuzzy – MPC
18th IFAC World Congress (IFAC'11)
Milano (Italy) August 28 - September 2, 2011
10737
6. Fig. 9 Fuel consumption and damper position diagram
7. CONCLUSIONS
In this paper we discuss a two-level and set point-oriented
controls in complex industrial heating plants, clay brick
production (firing) in tunnel kiln. Special attention is given to
model predictive control which is involved on the executive
control level. The control system was simulated in MATLAB
Simulink environment and the simulation results have been
presented. These results have been satisfactory in means of
quality of control, low fuel consumption and relatively easy
implementation. The implementation of Fuzzy-MPC
algorithm in real industrial heating plants will increase the
productivity of the plant at same or reduced fuel cost.
The future research will be oriented towards implementing a
Fuzzy –MPC algorithm on a laboratory model of industrial
furnace, and after that testing the developed control algorithm
on real industrial processes.
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18th IFAC World Congress (IFAC'11)
Milano (Italy) August 28 - September 2, 2011
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