低温烟气余热ORC系统工质选择及热经济性分析  

Working medium selection and thermal economic analysis of low temperature flue gas waste heat ORC system

作　　者：冯军胜 程新妮 王欢欢 赵亮 王海涛 董辉 FENG Junsheng;CHENG Xinni;WANG Huanhuan;ZHAO Liang;WANG Haitao;DONG Hui(School of Environment and Energy Engineering,Anhui Jianzhu University,Hefei 23060l,Anhui,China;School of Metallurgy,Northeastern University,Shenyang 110819,Liaoning,China)

机构地区：[1]安徽建筑大学环境与能源工程学院,安徽合肥230601 [2]东北大学冶金学院,辽宁沈阳110819

出　　处：《钢铁研究学报》2023年第9期1174-1183,共10页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(51974087,51904074);安徽省高校自然科学研究基金资助项目(2022AH050262);安徽建筑大学科研基金项目(2020QDZ02)。

摘　　要：以烧结余热锅炉出口烟气余热为有机朗肯循环(ORC)热源,建立亚临界ORC系统热力学模型和经济模型,研究不同循环工质下烟气进口温度、蒸发器节点温差和工质蒸发温度对系统热经济性能的影响。研究结果表明:烟气进口温度越高,蒸发器节点温差越小,系统净输出功越大。随着工质蒸发温度的增加,系统净输出功出现先增加后减小的情况。系统单位换热面积净输出功随蒸发器节点温差和工质蒸发温度的增加而增加,而随烟气进口温度的增加先增加后减小。当工质蒸发温度大于95℃时,工质R600a的热力性能最好,能获得最大的净输出功,反之工质R236ea的净输出功最大;当系统热力循环参数一定时,工质R601a的经济性能最好,能获得最大的单位换热面积净输出功,但其净输出功最小。With the flue gas waste heat at the outlet of sinter waste heat boiler as the heat source of organic Rankine cycle(ORC),the thermodynamic model and economic model of subcritical ORC system were established,and the effects of flue gas inlet temperature,pinch-point temperature difference in evaporator and evaporation temperature of working medium on the thermal economic performance were studied under different working mediums.The results show that the higher the flue gas inlet temperature is,the smaller the pinch-point temperature difference in evaporator is,the greater the system net output power is.The system net output power increases first and then decreases with the increase of evaporation temperature of working medium.The system net output power per unit heat exchange area increases with the increase of pinch-point temperature difference in evaporator and evaporation temperature of working medium,and increases first and then decreases with the increase of flue gas inlet temperature.When the evaporation temperature of working medium is greater than 95℃,the working medium R60Oa has the best thermodynamic performance and can obtain the largest net output power,and otherwise,the net output power of working medium R236ea is the largest.When the system thermal cycle parameters are constant,the working medium R6ola has the best economic performance and can obtain the largest net output power per unit heat exchange area,but the net output power of which is the smallest.

关 键 词：烧结矿 余热回收 有机朗肯循环 工质选择 热经济性能 

分 类 号：TK115[动力工程及工程热物理—热能工程]