Double-pass double-liquid heat exchange device

Abstract

The invention discloses a double-pass double-liquid heat exchange device and aims to provide a heat exchange device which can effectively realize heat exchange between two liquid, has the temperature difference compensation capacity and can prevent a shell and heat exchange tubes from being damaged caused by overlarge temperature difference stress between the shell and the heat exchange tubes. The double-pass double-liquid heat exchange device comprises a tube pass part, a shell pass part and a plurality of support frames, wherein the tube pass part comprises a tube pass inlet tube, a tube pass outlet tube and a plurality of heat exchange tubes; the shell pass part comprises a heat exchanger shell, a shell pass inlet tube and a shell pass outlet tube; the heat exchanger shell consists of a sealing head, a shell head and a tube box; a fixed tube plate is arranged between the shell head and the tube box; a sealing head tube plate is arranged between the sealing head and the tube box; the inner part of the shell head is divided into a tube pass flow inlet cavity and a tube pass flow outlet cavity through a tube pass flow isolation plate; an expansion joint is arranged on the tube box. The double-pass double-liquid heat exchange device has the benefits that through the characteristic that the deformation of the expansion joint is relatively easy and in cooperation with the slideable sealing head tube plate, a structural temperature difference compensation function can be realized, and the structure damage caused by overlarge temperature difference stress is avoided.

Description

technical field [0001] The invention belongs to the technical field of chemical heat exchange, and in particular relates to a double-pass double-liquid heat exchange device. Background technique [0002] Heat exchangers are process equipment for heat transfer and are widely used in oil refining, petrochemical industries, and other general chemical industries. Examples include cooling, condensation, heating, evaporation, and waste heat recovery. Due to the diversity of use conditions (corrosion, temperature, pressure, medium, impurities, heat exchange capacity, etc.), heat exchangers also need to have a reasonable structure and form. [0003] The shell and tube heat exchanger (shell and tube heat exchanger) is one of the most widely used heat transfer equipment at present. It exchanges heat between two liquids in the following way: one liquid flows through the shell, and , another liquid flows through the heat exchange tube, and the heat exchange is performed inside and out...

AI Technical Summary

Problems solved by technology

[0004] Although the current tube-and-tube heat exchanger can achieve heat exchange function well, in practical applications, there is often a situation where the temperature difference between the shell wall and the tube wall is large (caused by factors such as the large temperature difference between the two liquids), As a result, the thermal elongation of the shell and the heat exchange tube is significantly different, which will cause a considerable temperature difference stress between the shell and the heat exchange tube and the extrusion destructive force between the structures, resulting in serious damage to the equipment

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