超临界二氧化碳与空气联合循环效率分析

Supercritical Carbon Dioxide and Air Combined Cycle Efficiency Analysis

超临界二氧化碳(sCO_2)闭式循环适用于燃煤分布式发电,可采用分流再压缩循环方式,但在提高效率方面仍有不足之处。提出将sCO_2闭式循环与空气闭式循环组合成联合循环,联合循环的顶循环采用高效率的空气闭式循环。对sCO_2与空气联合循环和分流再压缩sCO_2循环发电系统的效率进行对比分析。结果表明,sCO_2与空气联合循环发电系统的效率可显著超过分流再压缩sCO_2循环,其用于分布式发电的效率可达到大型超超临界燃煤电站的水平。

Supercritical carbon dioxide(sCO2) closed cycle is suitable for coal-fired distributed power generation. It can adopt shunting-recompression cycle, but it still has some shortcomings for the improvement of efficiency. A combined cycle of sCO2 closed cycle and air closed cycle is proposed. The top cycle of the combined cycle adopts an efficient air closed cycle. The efficiency of sCO2 and air combined cycle and shunting-recompression sCO2 closed cycle was analyzed and compared. The results show that the efficiency of the sCO2 and air combined cycle can significantly exceed that of the shunting-recompression sCO2 closed cycle, and its efficiency for distributed generation can reach the level of large-scale ultra-supercritical coal-fired power plant.