低压蒸汽余热发电应用研究

The Research on Cogeneration of Low-pressure Saturated Steam

基于工程热力学理论,针对低压饱和蒸汽,建立了蒸汽直接膨胀系统、ORC余热发电系统、蒸汽直接膨胀联合ORC余热发电系统的计算模型,研究了蒸汽压力和回水温度对三种系统净发电量和发电效率的影响。结果表明:联合系统的净发电量最高;三种系统的净发电量和发电效率均随蒸汽压力的升高而升高,但ORC系统升高幅度较小;直接膨胀系统的净发电量和发电效率随回水温度的升高而急剧下降,其变化规律完全不同于另外两个系统。

Based on thermodynamics theory,the simulation method on three cogeneration of Low-pressure saturated steam,including steam expansion system,ORC system and cascade system were developed.The effect of steam pressure and cooling temperature on net power and power efficiency were investigated.The results show that the cascade system has the maximum net power.The net power and power efficiency increase with the steam pressure increase,and the increase degree of ORC system is lowest.The net power and power efficiency sharply decrease with the cooling temperature increase,which is different the others system.