A high temperature heat exchanger and its manufacturing process

Abstract

The invention relates to the technical field of heat exchangers, in particular to a high-temperature and high-pressure differential heat exchanger and a manufacturing process thereof. High temperature heat exchanger, including shell, heat exchange tube and tube sheet, high temperature resistant anti-corrosion layer and high temperature film tape are added between the contact surface of heat exchange tube and tube sheet, heat insulation sleeve is installed inside the heat exchange tube, heat insulation sleeve The surface is provided with high temperature film tape. And provide a high-temperature heat exchanger manufacturing process, through the improvement of the high-temperature heat exchanger structure and its manufacturing process, effectively solve the problem of corrosion at the end of the heat exchange tube, avoiding the shutdown of the entire device due to heat exchanger leakage, It meets the requirements of long-term stable operation of the device.

Description

technical field [0001] The invention relates to the technical field of heat exchangers, in particular to a high temperature and high pressure difference heat exchanger and a manufacturing process thereof. Background technique [0002] The information disclosed in this Background section is only for enhancement of understanding of the general background of the invention and should not necessarily be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. [0003] In chemical production, high temperature heat exchanger is an important equipment for cooling and heat exchange of high temperature gas or liquid. Through the recovery and conversion of heat, the energy efficiency balance of the device is effectively guaranteed. Since the heat exchange medium is high temperature and high pressure process gas and deoxidized water, in the production of traditional high temperature heat exch...

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Problems solved by technology

Since the heat exchange medium is high-temperature and high-pressure process gas and deoxygenated water, in the manufacture of traditional high-temperature heat exchangers, the connection method between the heat exchange tube and the tube sheet is generally selected in the way of strength welding + expansion, and the heat exchange equipment operates at high temperature. During the process, due to the difference in the materials of the heat exchange tube and the tube sheet, the thermal expansion coefficients of the materials are inconsistent. During the start-up process, there will be a gap in the expansion joint area between the heat exchange tube and the tube sheet, and deoxygenated water will accumulate in the gap. After high temperature gasification Gradually accumulate salt in the gap, and long-term operation will cause corrosion and leakage of heat exchange tubes and welds in the place where salt accumulates, making the device in hidden danger. If it is not discovered in time, it will cause a vicious accident of high pressure and low pressure

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