一种烧结余热复合循环发电系统的构建与分析

Construction and analysis of compound cyclic power generation system of sintering waste heat

烧结余热竖罐式回收是一种极具发展前景的烧结矿余热回收方式,其技术关键在于烧结矿的取热技术和能量转换技术。以空气闭式循环为取热方式,以CO2跨临界循环和R123有机朗肯循环为能量转换方式,创新地构建烧结竖罐余热复合循环发电系统,并确定工艺流程中各个节点的热工参数。此外,从发电量和效率等方面,探究循环工质的蒸发压力和蒸发温度对系统性能的影响。结果表明:在一定条件下,吨矿发电量为43.03 kW·h,效率为55.66%;同时,适当提高蒸发压力和蒸发温度可以提高系统吨矿发电量和系统效率。

The vertical tank recovery of sintering waste heat is a promising sinter waste heat recovery method,its key technology lies in the heat extraction technology and energy conversion technology of sinter.In this paper,the closed air cycle is taken as the heat extraction method,and the CO2 transcritical cycle and R123 organic Rankine cycle are used as energy conversion methods.The compound cyclic waste heat power generation system of vertical sintering tank is constructed innovatively,and the thermal parameters of each node in the process flow are determined.In addition,from the aspects of power generation and exergy efficiency,the effects of evaporation pressure and evaporation temperature of the circulating fluid on system performance are investigated.The results show that,under certain conditions,the power generation per ton of ores is 43.03 kW·h and the exergy efficiency is 55.66%.At the same time,by appropriate increasing evaporation the pressure and evaporation temperature,the system power generation per ton of ores and exergy efficiency of the system can be increased.