Research on low energy consumption CO2 capture technology and thermal economy of coal-fired units
ZHAO Hong-tao1,2, WANG Shu-min1, ZHANG Man3
1. China Energy Investment Corporation, Beijing 100011, China; 2. China Shenhua Coal to Liquid and Chemical Co., Ltd., Beijing 100011, China; 3. School of Chemical and Environmental Engineering, North China Institute of Science and Technology, Langfang 065201, China
Abstract: Aiming to solve the problem that the regeneration of post-combustion amine decarburization process consumes high energy,a low energy consumption CO2 capture system is established through integrating three energy-saving technologies in the common CO2 capture system,including inter-stage cooling,mechanical vapor recompression and rich liquid split desorption.This system is then coupled with the thermodynamic system of a 600 MW coal-fired unit,and the impact on the thermal economic indicators of the coal-fired unit is analyzed.Results show that as CO2 capture ratio is 90%,the energy consumption per unit of CO2 regeneration in this system drops from 4.09 GJ/t CO2 to 2.64 GJ/t CO2,a decrease of 35.28%.Compared with a coal-fired unit coupled with the common carbon capture system,the power plant efficiency of a coal-fired unit coupled with this low energy consumption carbon capture system increases from 30.81% to 33.53%,an increase of 2.72 percentage;the standard coal consumption decreases from 398.87 g/kWh to 366.81 g/kWh,a decrease of 32.06 g/kWh;the heat consumption rate decreases from 11,674.92 kJ/kWh to 10 736.53 kJ/kWh,a decrease of 938.36 kJ/kWh,and the thermal economy has significantly been improved.It is found that as CO2 capture ratio decreases by every 1%,the power plant efficiency of the low energy consumption carbon capture coal-fired units will increase by 0.054%,the standard coal consumption will decrease by 0.524 g/kWh,and the heat consumption rate will decline by 15.353 kJ/kWh.Reducing CO2 capture ratio can further improve the thermal economy of power plants.
赵红涛, 王树民, 张曼. 低能耗碳捕集技术及燃煤机组热经济性研究[J]. 现代化工, 2021, 41(1): 210-214.
ZHAO Hong-tao, WANG Shu-min, ZHANG Man. Research on low energy consumption CO2 capture technology and thermal economy of coal-fired units. Modern Chemical Industry, 2021, 41(1): 210-214.
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