基于储热介质和排气温度的绝热式压缩空气储能系统优化设计

Optimal design of adiabatic compressed air energy storage system based on heat storage medium and exhaust temperature

压缩空气储能系统概念设计指基于特定边界参数如储气库压力范围、环境压力和温度等确定具有最优效率的系统结构和参数。常规的等压缩膨胀比设计方式未考虑排气损失,导致实际热量利用率和效率较低。由于高温储热介质温度是决定压缩级数和系统效率的关键因素之一,本文以降低排气损失提高系统效率为目标,提出一种基于储热介质和排气温度的通用压缩膨胀级数及其参数配置方案;分析了该设计方案下,不同设计参数对储能系统的压缩级数和压缩比分配、膨胀级数和膨胀比分配、系统热量利用率、系统循环效率的影响。结果表明:该设计方案能够实现不同储热温度下系统效率的快速比较,相比于常规等压比设计方式,系统热量利用和循环效率更优,设计灵活性更强。

The conceptual design of compressed air energy storage system refers to the determination of the system structure and parameters with optimal efficiency based on specific boundary parameters such as gas storage pressure range,ambient pressure and temperature.The conventional equal compression expansion ratio design method does not consider exhaust loss,resulting in a low actual heat utilization rate and efficiency.Since the temperature of the high-temperature heat storage medium is one of the key factors that determine the number of compression stages and system efficiency,this article aims to reduce the exhaust loss and improve the system efficiency.It proposes a general compression expansion stage and parameter configuration scheme based on heat storage medium and exhaust temperature.In this design scheme,the influences of different design parameters on the compression stage and compression ratio distribution,expansion stage and expansion ratio distribution,system heat utilization rate,and system cycle efficiency of the energy storage system are analyzed.The results show that,this design scheme can achieve a quick comparison of system efficiency at different heat storage temperatures.Compared with the conventional equal pressure ratio design method,the system heat utilization and circulation efficiency of the proposed method are better,and the design flexibility is stronger.