利用有机朗肯循环系统回收30t/h燃煤锅炉烟气余热的热经济性评估

Thermo-economic evaluation of using organic Rankine cycle system to recover flue gas waste heat of a 30t/h industrial boiler

设备选择和经济性评估对有机朗肯循环系统(ORC)热力性、经济性和环境影响至关重要。文中以R123为工质,以某厂30t/h蒸发量锅炉烟气余热回收利用作为案例,对ORC系统回收利用烟气余热进行了设备及热经济性计算分析,给出了具体设备热经济计算结果,锅炉烟道中换热管束的布置形式和尺寸。结果表明,系统单位装机容量成本为23 800元/kW,单位发电成本为0.285元/kW·h,投资回收年限为5.58年,净输出功为91.5kW,发电功率为88.5kW。考虑主要设备及运行维护费用,系统总投资约合人民币345万元。

Equipment selection and thermo-economic evaluation have great influence on thermodynamic performance,economic feasibility and environmental impacts of ORC（organic rankine cycle）systems.Selecting R123 as working fluid,we conduct the main parameters of equipment and thermos-economic analysis for ORC electricity generation system driven by the flue gas waste heat of a real 30 t/h industrial boiler.Then heat exchanger sizes and thermos-economic results are calculated,and the operating parameters of equipment and heat exchanger layout are put forward.The results show that the unit capacity cost,electricity production cost,payback period,net power output and electricity production power are23 800 Yuan/kW,0.285 Yuan/（kW·h）,5.58 years,91.5 kW and 88.5 kW,respectively.Considering the main equipment and operation maintenance cost,the system total investment is RMB 3.45 million.