高压调温水余热有机朗肯循环发电系统研究及工程应用

Research and industrial application of ORC power generation system with waste heat of high pressure temperature-regulating water

以流量为130 t/h、温度为130℃的尿素装置高压调温水(高调水)为研究对象,基于有机朗肯循环(organic Rankine cycle,ORC)系统建立模型,采用R245fa、R600a和R236ea作为循环工质,分别在蒸发温度95~115℃,冷凝温度26~34℃,过热度0~20℃条件下对其系统性能进行模拟研究。结果表明:在相同的模拟条件下,R245fa的循环热效率最高,净输出功最大;R600a的净输出功最小,但是比净功最大;R236ea的循环热效率最低,比净功最小。依据模型研究结果,综合考虑了热力学性能、安全性及环保性,选择以R245fa为循环工质,设计并建设了高调水余热ORC发电机组。实际运行结果显示:机组的循环热效率和净输出功随着环境温度的影响较大,在冬季环境温度为5.4℃时,机组循环热效率达到10.78%,净输出功为221.40 kW;而夏季环境温度为30.3℃时,机组的循环热效率为9.06%,净输出功仅有190.5 kW。

By taking the130t/h and 130℃high-press temperature-regulating waterin urea device as the research object,the model oforganic Rankine cycle(ORC)systemis established.R245fa,R600a and R236ea are used as the working fluids,and the system performance is studied under conditions withevaporation temperature of 95~115℃,condensation temperature of 26~34℃and superheat degree of 0~20℃.The research results show that,under the same simulation conditions,R245fa has the highest cycle thermal efficiency and the largest net output power,R600a has the smallest net output power but the largest specific net work.R236ea has the lowest cycle thermal efficiency and the smallest specific net work.According tothe results of the model researchandcomprehensively considering the aspectsofthermodynamic performance,safety and environmental protection,R245fa is selected as the circulating working fluid,and the high pressure temperatureregulating water waste heat ORC generator set is designed and constructed.The actual operation results of the unit show that,the circulating thermalefficiency and net output power of the unit are greatly affected by the ambient temperature.When the ambient temperature in winter is 5.4℃,the cycle thermal efficiency of the unit reaches 10.78%,and the net output power is 221.40kW.When the ambient temperature in summer is 30.3℃,the cycle thermal efficiency of the unit reaches9.06%and the net output power is only 190.5kW.