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基于夹点技术,采用整体系统和子系统换热网络优化法对氯醇法生产环氧丙烷工艺系统换热网络进行优化及对比,得出较佳优化方法.利用Aspen软件对提取工艺系统流股数据进行校验并计算.结果表明,现行网络夹点温差为30 K,整体系统夹点温度为329.5 K,子系统换热网络夹点温度分别为327,329.5,317.2 K;整体系统优化后节约能耗595.3 k W,分别占原系统热、冷公用工程能耗的17.47%和5.23%;子系统优化后节约能耗610.6 k W,占原系统热、冷公用工程能耗的17.91%和5.36%.氯醇法生产环氧丙烷工艺系统换热网络优化利用子系统优化方法较佳.
Based on the pinch-in technique, the optimization of the heat exchange network of propylene oxide production system by chlorohydrin process was optimized and compared with the overall system and subsystem heat exchange network optimization method, and a better optimization method was obtained.Aspen software was used to extract the process data The results show that the temperature drop of the current network is 30 K, the temperature of the whole system is 329.5 K and the temperature of the heat transfer network of the subsystem is 327, 329.5 and 317.2 K, respectively. The overall system optimization saves 595.3 k W, accounting for 17.47% and 5.23% respectively of the original system thermal and cold utility energy consumption, and the subsystem energy saving 610.6 k W, accounting for 17.91% and 5.36% of the original system thermal and cold utility energy consumption. The optimal method of heat transfer network optimization and utilization subsystem for alcohol production of propylene oxide process system is better.