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Alcohol Amine CO_2 trapping process simulation and process improvement

Author: LiTaiXing
Tutor: LiQingLing
School: Qingdao University of Science and Technology
Course: Chemical Process Equipment
Keywords: Chemical absorption method Carbon dioxide Process Simulation Organic amines Improved technology Energy Optimization
CLC: X701
Type: Master's thesis
Year: 2010
Downloads: 320
Quote: 2
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Abstract


CO2 emissions from power plants accounting for the world's major greenhouse gas CO2 emissions by 30% of the total research power plant flue gas low-cost, large-scale CO2 capture technology has great significance. This paper uses a chemical CO2 capture technology for existing capture process issues such as the presence of high energy consumption, based on PRO / Ⅱ software platform for victory coal-fired power plant 40,000 tons / year of CO2 capture system has been improved process simulation study. Select a single MEA and MEA MDEA mixed amine as an absorbent for trapping process was studied for large-scale projects to provide reference gas CO2 capture optimal parameters in order to achieve lower capture costs, reduce energy consumption and improve the CO2 recovery rate purposes. Establish a chemical CO2 absorption model to analyze the various factors (absorption liquid volumetric flow rate, absorbing fluid temperature, flue gas temperature, concentration of, etc.) the impact of CO2 absorption rate compared CO2 absorber layers at the plate Load discussed MEA mixed amine solution concentration of CO2 absorption rate, and to investigate the absorption rate of CO2 pressurized role in promoting. Obtained optimal process parameters, the flue gas into the tower and absorb fluid temperature to 40 ℃ is appropriate; adding a small amount in the MEA MDEA solution can significantly increase the CO2 absorption rate. CO2 desorption chemical established model to analyze the various factors (heat load of the reboiler, reboiler pressure) rate of desorption of CO2 investigated lean reboiler pressure between fluid outlet temperature, compare the desorption The temperature at each layer tray tower, and explores the desorption rate of CO2 reduced role in promoting. The results show that: the MEA absorption liquid, the best reboiler heat load 7000kw, best reboiler pressure 120kpa; using MEA MDEA amine mixture absorbed best reboiler heat load of 5000kw ~ 5500kw, best reboiler pressure 90kpa. Established the CO2 capture system model, and make the whole process simulation. Analysis of various factors (the reboiler heat load, lean liquid volume flow rate, MEA mass fraction) of CO2 yield of investigated tray tower at a temperature within the respective layers, the gas volume flow rate changes, and discusses the increasing pressure on the CO2 absorber yield role in promoting. The results show that: MEA MEA absorption solution concentration should be 15%; should adopt minimum absorbed liquid volume flow rate 110m3 / h; temperature than the high ends of the central absorber; With rising gas absorber, the first increase in gas volume flow then decreases; increase absorber pressure, CO2 yield increases, but increased significantly smaller. The traditional process for CO2 capture in the process has been improved. Recirculating part of the absorption liquid using a trapping process, increasing by one side of the stream in the absorber, can reduce the minimum absorption liquid flow rate, thereby reducing the heat load of the reboiler. Simulation results show that after using improved technology, CO2 yield increased from 5.0 to 14.3%, the reboiler heat load reduction of 7.5% ~ 8.1%.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Exhaust gas processing and utilization
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