Study On The CO₂ Capture From Flue Gases Of Power Plant And Technology And Economic Analysis

Because of overmeasure greenhouse gas,the global temperature is becoming higher and higher, and the CO₂ in flue gases of power plant is the main source CO₂, we should capture this part of CO₂ and reuse it.In this paper,the problems of CO₂ capture from flue gases of power plant are showed, to solve them, this article conducted small scale experiments to select better amine solutions, and did technology and economic analysis of ShengLi power plant CO₂ capture project,it also introduced a new method to research the CO₂ capture from flue gases of power plant.In the experiment parts, this paper measured the absorption rate, capacity and removal rate of 5 kinds of amines solutions as MEA,DEA,MDEA,AMP and TETA, the results showed that TETA got the best absorption rate,capacity and removal rate, the absorption rate of MEA was also quick but it had descended swift,MDEA had got a long time absorption persistence but lower absorption rate.But when the concentration of MDEA is above 0.5 mol/L,MDEA had a obvious advantage on the absorption time.The performance of DEA and AMP was almost the same,normal absorption data.Then,we chose MEA and TETA as the chief solvent,added the other 4 kinds of amine to compose mixed solutions and studied their absorption speciality.The results showed that the interaction index of absorption rate and absorption capacity and removal rate of MEA+MDEA is 1.12,1.76,1.01,and the MEA+AMP is 1.28,2.45,1.19.We found that the mixed solutions of MEA+AMP was not only fast in absorption rate, but also long at absorption persistence, as also as higher removal rate, which is the best mixed solution. And MEA+MDEA is prolonged at absorption persistence notablely, and a little shift at absorption rate.Contrary to MEA,the data of TETA mixed solutions all declined, included the absorption rate, capacity and removal rate compared to TETA, maybe TETA was not appropriate to form mixed solutions.To solve the problem of high cost and energy consumption of CO₂ capture system.Based on the data of the CO₂ capture system of ShengLi power plant, this paper analyzed the technology and economic property of CO₂ capture project.The process of the project was analysed,the paper showed the technology roadmap and the method of CO₂ treatment. It also calculated the heat exchanger efficiency of the heat exchangers of the capture system,it then calculated the energy consumption of the compress process.At last,the paper brought forward several methods to reduce the energy consumption,as to lift the pressure of CO₂ compress process.About the cost of the CO₂ capture system,this paper analyzes the cost of the entire system,including the initial investment and operating costs,detailing the composition of CO₂ capture costs,while efficiency was also analyzed,including the monetary benefits and non-monetary benefits, including monetary benefits. At the victory of power plant flue gas CO₂ capture system,the profit margin is about 15%.Finally, this paper simulated power plant flue gas CO₂ capture with AspenPlus,which is a preliminary study,and selected a appropriate module and method to make a calculation on the basis of flue gas CO₂ capture process simulation The results showed that the process can be simulated with AspenPlus.Include the system design,optimization of operations and transformation, not only considering the number of process parameters on the effect of running, but relative to the pilot test, it could save a lot of manpower and material resources in order to optimize the cost of very low Production and improve economic efficiency..