基于燃煤电厂烟气余热利用场景下的卡诺电池系统性能分析

Performance Analysis of Carnot Battery System Based on Waste Heat Utilization Generated of Flue Gas Generated by Coal-Fired Power Plant

储能技术对实现余热利用、推进能源可持续发展具有重要意义。本文基于燃煤发电场景,建立了由高温热泵和Kalina循环组成的卡诺电池系统模型,分析了系统压力对卡诺电池放电阶段性能的影响及热源温度对卡诺电池充电阶段性能和循环效率的影响。结果表明,闪蒸压力增大,热机效率越高,越利于提高总系统性能,而透平出口压力越大,热机效率则越小。随着烟气热源温度升高,热泵COP逐渐增加,且在储热温度恒定下,系统循环效率亦随热源温度升高而升高。本研究不仅拓宽了卡诺电池的使用场景,也为烟气余热利用场景下的储能技术研究提供性能数据参考。

Energy storage technology is of great significance for waste heat utilization and promoting sustain-able energy development. Based on the coal-fired power generation scenario, this paper establishes a Carnot battery system model composed of a high-temperature heat pump and Kalina cycle, and analyzes the influence of system pressure on the performance of the Carnot battery discharge stage and the influence of heat source temperature on the roundtrip efficiency and performance of charging stage. The results show that when the flash pressure increases, the efficiency of the heat engine increases with it;the greater the turbine outlet pressure, the smaller the efficiency of the heat engine. As the temperature of heat source of the flue gas increases, the COP gradually increases, and under the constant heat storage temperature, the roundtrip efficiency also goes up with the in-crease of the heat source temperature. This study not only broadens the use scenario of Carnot bat-teries, but also provides performance data reference for the research of energy storage technology under the flue gas waste heat utilization scenario.