与燃煤电站耦合的压缩空气储能系统性能分析

Performance Analysis of Compressed Air Energy Storage System Coupled with Coal-fired Power Plant

为提高压缩空气储能系统的整体性能,以燃煤电站回热系统为基础,提出一种将压缩空气储能系统与燃煤电站耦合的方案。在储能过程中,采用燃煤电站回热系统的给水冷却压气机出口的压缩空气;在释能过程中,膨胀机入口的压缩空气被回热系统的给水加热,同时采用给水回收膨胀机排气的热量。以某630 MW燃煤电站为研究对象,对新型压缩空气储能系统进行了能量分析、[火用]分析和经济性分析。结果表明:通过系统耦合,不仅可以提高压缩空气储能系统的性能,同时可以省去常规压缩空气储能系统的蓄热设备,耦合系统具有良好的可行性,其循环效率和[火用]效率分别为63.28%和79.02%,动态投资回收期为7.06 a,净现值可达1449.65万元。

To improve the overall performance of the compressed air energy storage(CAES)system,based on the heat regenerative system of a coal-fired power plant,a scheme of CAES system coupled with the coal-fired power plant was proposed.In the energy storage process,the feedwater from the heat regenerative system in the coal-fired power plant was used to cool the compressed air at the outlet of the compressor.In the energy release process,the compressed air at the inlet of the expander was heated by the feedwater from the heat regenerative system.At the same time,the feedwater was used to recover the heat from the exhaust of the expander.Taking a 630 MW coal-fired power plant as a research object,the energy analysis,exergy analysis and economic analysis of the proposed system were carried out.Results show that the system integration can not only improve the performance of CAES system,but also remove the heat storage equipment of the conventional CAES system,showing that the proposed system is extremely feasible.For the proposed system,the circulation efficiency and exergy efficiency are 63.28%and 79.02%,respectively;the dynamic payback period is 7.06 years,and the net present value can reach 14496.5 thousand yuan.