丙烯腈生产工艺低品位能量回收系统及其性能的研究  

Design and Performance Analysis of a Low-Grade Energy Recovery System for Acrylonitrile Production

作　　者：刘纪云[1] 卢苇[1] 陈汉[1] 王颖[1] 徐昆[1] 许浩[1] 

机构地区：[1]广西大学化学化工学院,广西南宁530004

出　　处：《石油化工》2015年第12期1512-1517,共6页Petrochemical Technology

基　　金：国家自然科学基金项目(51366001);广西自然科学基金项目(2013GXNSFAA019292)

摘　　要：为回收利用丙烯腈生产投料段液态原料的冷能及吸收塔尾气焚烧炉排放的低温烟气余热,设计了一种喷射式制冷循环与低温有机朗肯循环复合的低品位能量回收系统。结合某年产200 kt丙烯腈项目,利用Matlab建模对所设计的系统进行仿真。试验结果表明,在满足工艺冷量需求的前提下,喷射式制冷机组较原工艺中的螺杆制冷机组可节电110.65 k W;由于利用了液态原料蒸发过程的冷能,该系统中有机朗肯循环在较低的冷凝温度下运行,较常规有机朗肯循环系统热效率提高52.4%;该系统的热效率和?效率分别为19.1%和49.8%;提高热源发生压力和循环工质过热度及降低循环工质冷凝温度,均有利于提高系统的性能。A low-grade energy recovery system combining the ejector refrigeration cycle with the low temperature organic Rankine cycle was established to utilize the cold energy of liquid raw materials in acrylonitrile production and the waste heat in low temperature exhaust gas from absorber off gas incinerator. In a 200 kt/a acrylonitrile production unit, the established system was simulated by means of the Matlab software. The results revealed the ejector refrigeration unit could save electricity of 110.65 kW compared to the screw refrigeration unit in the existing process. Due to the utilization of cold energy in the liquid feed evaporation, the organic Rankine cycle in the established system could operate at lower condensing temperature, which enhanced the thermal efficiency of 52.4% higher than that of the conventional organic Rankine cycle. The thermal efficiency and the exergy efficiency of the established system were 19.1% and 49.8%, respectively. In addition, it was shown that increasing generation pressure, increasing superheat and decreasing condensing temperature were beneficial to improving the performance of the established system.

关 键 词：丙烯腈 低品位能量回收 有机朗肯循环 喷射制冷循环 

分 类 号：TQ226.6[化学工程—有机化工]