Priming, foaming and carryover
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The document discusses priming, foaming, and carryover in boilers. Priming occurs when water particles carry over into the steam, lowering efficiency. It can be caused by high water levels, foaming, load fluctuations, or impurities. Carryover is when contaminants leave with the steam and can cause deposition. It results from incomplete steam separation in the boiler drum. Foaming forms unbroken bubbles on the boiler water from issues like dissolved solids, suspended solids, alkalinity, or oil contaminants. The document is authored by Md.Arifull Hoque Shaheen, a junior assistant manager in Bangladesh discussing these issues.
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Unit-III-ELECTROCHEMICAL STORAGE DEVICES.ppt
Batteries -Introduction – Types of Batteries – discharging and charging of battery - characteristics of battery –battery rating- various tests on battery- – Primary battery: silver button cell- Secondary battery :Ni-Cd battery-modern battery: lithium ion battery-maintenance of batteries-choices of batteries for electric vehicle applications.
Fuel Cells: Introduction- importance and classification of fuel cells - description, principle, components, applications of fuel cells: H2-O2 fuel cell, alkaline fuel cell, molten carbonate fuel cell and direct methanol fuel cells.
Design and optimization of ion propulsion drone
Electric propulsion technology is widely used in many kinds of vehicles in recent years, and aircrafts are no exception. Technically, UAVs are electrically propelled but tend to produce a significant amount of noise and vibrations. Ion propulsion technology for drones is a potential solution to this problem. Ion propulsion technology is proven to be feasible in the earth’s atmosphere. The study presented in this article shows the design of EHD thrusters and power supply for ion propulsion drones along with performance optimization of high-voltage power supply for endurance in earth’s atmosphere.
Electric vehicle and photovoltaic advanced roles in enhancing the financial p...
Climate change's impact on the planet forced the United Nations and governments to promote green energies and electric transportation. The deployments of photovoltaic (PV) and electric vehicle (EV) systems gained stronger momentum due to their numerous advantages over fossil fuel types. The advantages go beyond sustainability to reach financial support and stability. The work in this paper introduces the hybrid system between PV and EV to support industrial and commercial plants. This paper covers the theoretical framework of the proposed hybrid system including the required equation to complete the cost analysis when PV and EV are present. In addition, the proposed design diagram which sets the priorities and requirements of the system is presented. The proposed approach allows setup to advance their power stability, especially during power outages. The presented information supports researchers and plant owners to complete the necessary analysis while promoting the deployment of clean energy. The result of a case study that represents a dairy milk farmer supports the theoretical works and highlights its advanced benefits to existing plants. The short return on investment of the proposed approach supports the paper's novelty approach for the sustainable electrical system. In addition, the proposed system allows for an isolated power setup without the need for a transmission line which enhances the safety of the electrical network
Rainfall intensity duration frequency curve statistical analysis and modeling...
Using data from 41 years in Patna’ India’ the study’s goal is to analyze the trends of how often it rains on a weekly, seasonal, and annual basis (1981−2020). First, utilizing the intensity-duration-frequency (IDF) curve and the relationship by statistically analyzing rainfall’ the historical rainfall data set for Patna’ India’ during a 41 year period (1981−2020), was evaluated for its quality. Changes in the hydrologic cycle as a result of increased greenhouse gas emissions are expected to induce variations in the intensity, length, and frequency of precipitation events. One strategy to lessen vulnerability is to quantify probable changes and adapt to them. Techniques such as log-normal, normal, and Gumbel are used (EV-I). Distributions were created with durations of 1, 2, 3, 6, and 24 h and return times of 2, 5, 10, 25, and 100 years. There were also mathematical correlations discovered between rainfall and recurrence interval.
Findings: Based on findings, the Gumbel approach produced the highest intensity values, whereas the other approaches produced values that were close to each other. The data indicates that 461.9 mm of rain fell during the monsoon season’s 301st week. However, it was found that the 29th week had the greatest average rainfall, 92.6 mm. With 952.6 mm on average, the monsoon season saw the highest rainfall. Calculations revealed that the yearly rainfall averaged 1171.1 mm. Using Weibull’s method, the study was subsequently expanded to examine rainfall distribution at different recurrence intervals of 2, 5, 10, and 25 years. Rainfall and recurrence interval mathematical correlations were also developed. Further regression analysis revealed that short wave irrigation, wind direction, wind speed, pressure, relative humidity, and temperature all had a substantial influence on rainfall.
Originality and value: The results of the rainfall IDF curves can provide useful information to policymakers in making appropriate decisions in managing and minimizing floods in the study area.
IEEE Aerospace and Electronic Systems Society as a Graduate Student Member
IEEE Aerospace and Electronic Systems Society as a Graduate Student Member
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6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
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Priming, foaming and carryover
- 1. Md.Arifull Hoque Shaheen Jr.Assistant Manager (chemical) 410MW CCPP Bheramara,Khustia Bangladesh. PRIMING, FOAMING AND CARRYOVER
- 2. Md.Arifull Hoque Shaheen Jr.Assistant Manager (chemical) 410MW CCPP Bheramara,Khustia Bangladesh. Priming Priming means carryover of water particle in the steam which lowers the energy efficiency of the steam and leads to scale formation at superheater and in the turbine blade. Priming may be caused due to the following reasons: • High water level • Foaming of feedwater • Sudden fluctuation in steam demand • High impurities concentration in the boiler water • Improper construction of the boiler High water level is the common cause of priming. To avoid priming, high water level, excessive boiler load and sudden load change should be avoided
- 3. Md.Arifull Hoque Shaheen Jr.Assistant Manager (chemical) 410MW CCPP Bheramara,Khustia Bangladesh. Carryover During carryover, contaminant leaves a boiler steam drum with the steam. It can be in solid, liquid or gaseous form. It is undesirable in a boiler. Some of the effects of carryover are mentioned below: • Deposition in regulating and controlling valves • Deposition in superheater • Deposition in servomotor control valves and turbine blade • Process contamination
- 4. Md.Arifull Hoque Shaheen Jr.Assistant Manager (chemical) 410MW CCPP Bheramara,Khustia Bangladesh. Carryover Carryover is due to the incomplete separation of steam from the steam–water mixture in the boiler drum. Steam separation units are placed inside the boiler drum. Defects on these separation units may lead to carryover. Foaming of boiler water is also responsible for carryover. Boiler design, type of mechanical steam separating equipment, load fluctuation, boiler drum level, amount of space available for steam separation from the steam–water mixture are some of the causes of carryover.
- 5. Md.Arifull Hoque Shaheen Jr.Assistant Manager (chemical) 410MW CCPP Bheramara,Khustia Bangladesh. Foaming Foaming is the formation of unbroken bubbles on the surface of the boiler water inside the boiler drum. The bubbles may be in thin layer with few bubbles overlying each other or it may build up throughout the steam space. When these bubbles burst, moisture is entrained with the steam. Some of the causes of foaming are given below: • High dissolved solid concentrations in the boiler water • High suspended solid concentration • High alkalinity concentration • Oil and organic contaminants in the boiler water
- 6. Md.Arifull Hoque Shaheen Jr.Assistant Manager (chemical) 410MW CCPP Bheramara,Khustia Bangladesh. Thank you