关键词: 光伏发电, 钾基CO2吸收剂, 光伏光热综合利用, 燃煤发电, 光伏余热, 碳捕集, 电站效率, 太阳能

Abstract: Carbon capture in coal-fired power stations is an important measure to alleviate the global greenhouse effect. The equipment for coal-fired power stations taking post-combustion carbon capture technology is generally placed at the tails of stations.It is conducive to the integration and transformation of existing power stations，but is of high energy consumption rate . Powering the carbon capture equipment soley by the coal-fired power stations will impact their power generation efficiencies. There is abundant residual heat in the conversion process of gallium arsenide（Ga-As）concentrated PV batteries，and the temperature is higher than that required as potassium-based carbon capture heat source，which shows potential in driving potassium-based carbon capture reaction. Therefore，this study proposes a comprehensive utilization method of concentrated photovoltaic power generation and carbon capture with residual heat，and explore the influence of PV operating temperature and irradiation on the performance of concentrated photovoltaic power generation and carbon capture，after establishing a model of energy conversion by Ga-As and one of carbon capture by potassium-based absorbent driven by residual heat. Applying it into a 600 MW subcritical coal-fired power station，compared it with a carbon capture system driven coal-fired power station，the power generation efficiency in the integrated system increased by 6.56 percentage points and its total power generation increased by 50% roughly.Compared it with a concentrated PV system，the efficiency of PV power generation is reduced by 4.49 percentage points，but the additional carbon capture per hour is increased by 380.82 t. The method proposed alleviates the impact of carbon capture energy consumption on the efficiency of coal-fired power stations，which realizes the solar energy dual usage of within power generation and carbon emission reduction，and provides a new idea for the efficient cascade utilization of solar energy.

Key words: photovoltaic power generation, potassium-based CO2 capture absorbent, comprehensive utilization of concentrated photovoltaic power and photovoltaic heat, coal-fired power generation, photovoltaic of residual heat, carbon capture, efficiency of coal-fired power station, solar power