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基于低品位能源利用冷热电联供技术,以常规燃煤电厂排出温度为150℃的烟气为余热利用对象,提出了CO2跨临界循环冷热电联供系统模型,分析了膨胀机入口压力和温度等参数对系统性能的影响.结果表明:压缩机入口过热度对系统性能系数、经济性能系数的影响很小;系统性能系数随着高压膨胀机入口压力、低压膨胀机入口温度和膨胀机效率的升高而增大,随着高压膨胀机入口温度、低压膨胀机入口压力和制冷蒸发温度的升高而减小;系统总不可逆损失随着高压膨胀机入口压力的升高存在最小值.
Based on the low-grade cogeneration technology for energy utilization, the flue gas with 150 ℃ discharged from the conventional coal-fired power plant is taken as the target of waste heat utilization. A CO2 transcritical cycle combined heat and power (COC) system is proposed. The inlet pressure of the expander Temperature and other parameters on the performance of the system.The results show that: the compressor inlet superheat has little effect on the system performance coefficient and economic performance coefficient; the system performance coefficient increases with the inlet pressure of the high-pressure expander, the inlet temperature of the low-pressure expander and the expander Efficiency increases with inlet pressure of high-pressure expander, inlet pressure of low-pressure expander and refrigeration evaporation temperature decreases; the total irreversible loss with the high-pressure expander inlet pressure there is a minimum value.