关键词: 换热网络, 压力, 夹点技术, 柴油加氢改质装置

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