XING Chenjian;WANG Ruilin;ZHAO Chuanwen;

• 1:School of Energy and Mechanical Engineering
• 2:Nanjing Normal University

Abstract：

In order to deal with the problem of global warming,it is imperative to transform the carbon capture of existing coal-fired power plants and vigorously develop clean energy. Chemical absorption method is the most mature in carbon capture technology,but its high energy consumption seriously affects the power generation efficiency of coal-fired power stations. Therefore,some scholars have proposed the use of clean energy-assisted carbon capture,in which photo-thermal-assisted carbon capture is the most widely used,but this use method does not play the potential of single photo-thermal utilization. By using a large amount of low-grade waste heat generated in the process of concentrating photovoltaic power generation to assist carbon capture,the efficiency of the photovoltaic system can be improved while the low-grade waste heat is effectively used. Based on this research,a new system of concentrating photovoltaics-photovoltaic waste heat directly assisted carbon capture was conceived,and an energy conversion model of concentrating gallium arsenide-waste heat assisted amine decarbonization was established to verify the potential of concentrated photovoltaic waste heat directly assisted amine decarbonization in quality and quantity. According to the sensitivity analysis of heat consumption,the key parameters of the amine decarburization system were optimized. The minimum heat consumption could reach 3.7 GJ/t. The influence of battery working temperature and radiation intensity on the carbon capture performance and photoelectric efficiency of the system was analyzed,and the optimal working temperature of the battery was determined as 140 ℃ . By integrating the new system into a typical 600 MW coal-fired power station and comparing it with the reference system,it can be obtained that compared with a single coal-fired carbon capture,the power generation efficiency of the power station is increased by 6.01%,and the photovoltaic power generation is increased by 185.2 MW; compared with a single photovoltaic,the photovoltaic power generation is reduced by 15.79 MW,but the waste heat accounting for 60% of the received solar energy is effectively used,which can achieve 461. 75 t/h CO_2 capture. The average daily photovoltaic power generation of the new system on a typical day is 61.8 MW,and the average daily carbon capture capacity is 155.6 t/h. In order to achieve an annual carbon capture guarantee rate of more than 80%,the Concentrating photovoltaic area above about 4 km~2 is required. The new system uses photovoltaic waste heat instead of the original low-pressure cylinder extraction steam from the power station,eliminating the energy penalty of carbon capture on the power station,while converting high-grade solar energy into electricity,and using photvoltaic waste heat in a grade-matched manner. The system finally realizes the efficient use of solar energy and the parallel clean use of fossil energy.

Key Words： amine decarbonization;solar assisted carbon capture;photovoltaic power generation;photovoltaic residual heat utilization;carbon capture in coal-fired power plants

Abstract:

Keywords:

Foundation: 国家自然科学基金资助项目(U1510129)

Authors: XING Chenjian;WANG Ruilin;ZHAO Chuanwen;

DOI: 10.13226/j.issn.1006-6772.CCUS20092901

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