Abstract: Considering pressure factor in design and retrofit of heat exchanger networks (HEN) can improve its economic benefit. In this work, three schemes for the HEN in a diesel hydro-upgrading device are proposed with different consideration of pressure factor by Pinch technology. Scheme 1 without considering pressure constraints can recover heat to the maximum extent while the investment cost is the highest. Scheme 2 considers the pressure factor under the condition that the reaction feed pump can be replaced, which is suitable for the new design of the heat exchanger network. Scheme 3 considers the pressure factor under the condition that the reaction feed pump is kept unchanged, which is appropriate for the retrofit of the heat exchanger network. Compared with Scheme 1, Schemes 2 and 3 can significantly reduce the investment cost and have better economic benefits. The results show that the pressure can not be ignored in the synthesis of heat exchanger networks.

Key words: heat exchanger network, pressure, pinch technology, diesel hydro-upgrading device

摘要： 在换热网络设计和改造中考虑压力因素，可以提高换热网络的经济性。本文采用夹点技术，针对某炼厂柴油加氢改质装置，提出了3种不同程度考虑压力因素的换热网络优化方案。方案1为最大热回收方案，不考虑压力约束，回收热量最大但投资也最高；方案2，在考虑可更换反应进料泵的前提下，考虑压力因素，适合于该换热网络的新设计；方案3，在维持反应进料泵不动的前提下，考虑压力因素，适合于该换热网络的改造。方案2和方案3均较方案一明显地减少了设备投资费用，具有更好的经济效益，说明了在换热网络综合中压力因素不可忽视。

关键词: 换热网络, 压力, 夹点技术, 柴油加氢改质装置