关键词: 连续重整装置, 混合进料换热器, 焊接板式换热器, 缠绕管式换热器, 热端温差, 反应物料压力降

Abstract: As the key equipment of the reforming unit, the performance of the feed heat exchanger directly affects the energy consumption and stable production of the whole unit. In order to further explore the operation characteristics of different types of heat exchangers in large unit, it takes four series of 3.8 MM TPY continuous reforming unit of Zhejiang Petroleum & Chemical Co., Ltd. as a case to compare and analyze the heat end temperature difference and reaction pressure drop of the welded plate and winding tube heat exchanger under the same load and changing load conditions. The results show that under the same load condition, the temperature difference of the winding pipe heat exchanger is 6~7 ℃ lower than the weld plate heat exchanger, and the reaction pressure is reduced 15~20 kPa. Under changing load condition, the reaction pressure drop of the winding pipe heat exchanger is 0.6 times that of the welded plate heat exchanger, which can show strong fluctuation resistance. It is concluded that under the working conditions of this case (not considering the change of feed components), the winding pipe heat exchanger for the reforming unit has the advantages of high heat exchange efficiency, small reaction pressure drop and good fluctuation resistance. It provides a practical reference for the system design and optimization of large scale refining and chemical unit.

Key words: continuous reforming unit, mixed feed heat exchanger, welded plate heat exchanger, winding pipe heat exchanger, heat end temperature difference, pressure drop of reaction mass