Abstract: Analysis was conducted on the optimization of heat exchanger networks of propylene oxide production system using chlorohydrin method based on pinch technology, and the optimization methods of whole system and subsystems were used to compare with each other for better optimization method. Aspen software was used to verify the data of each stream taken from the whole process system and to calculate and analyze. The results showed that the current network temperature difference of pinch point was 30 K, the temperature of pinch point of the whole system was 329.5 K and the temperature of pinch point of subsystems was 327, 329.5 and 317.2 K, respectively. The optimization method of whole system heat exchange network could achieve energy saving target for 595.3 kW which took up 17.47% and 5.23% of the hot and cold utilities of original system. The optimization method of subsystem heat exchange network could save 610.6 kW which took up 17.91% and 5.36% of the hot and cold utilities of original system. The optimization method of subsystem heat exchange network was better for the optimization of heat exchanger network of propylene oxide production system using chlorohydrin method.

Key words: pinch technology, heat exchanger network, propylene oxide, chlorohydrin method, Aspen software, optimization

摘要： 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 kW，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 kW，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.

关键词: 夹点技术, 换热网络, 环氧丙烷, 氯醇法, Aspen软件, 优化