double pass heat exchanger

Abstract

The invention discloses a double-pass heat exchanger and aims at providing a heat exchanger which can effectively realize heat exchange between two kinds of liquid, has a temperature difference compensation capacity and can prevent a shell and heat exchange tubes from being damaged due to excessive large temperature difference stress. The double-pass heat exchanger comprises a tube pass portion, a shell pass portion and a plurality of supports, wherein the tube pass portion comprises a tube pass inlet tube, a tube pass outlet tube and a plurality of heat exchange tubes, the shell pass portion comprises a heat exchanger shell body, a shell pass inlet tube and a shell pass outlet tube, the heat exchanger shell body consists of a seal head, a shell head and a tube box, a fixing tube plate is arranged between the shell head and the tube box, a seal head tube plate is arranged between the seal head and the tube box, a tube pass flow isolating plate divides the internal portion of the shell head into a tube pass flow inlet chamber and a tube pass flow outlet chamber, and an expansion joint is arranged on the tube box. The double-pass heat exchanger has the beneficial effects that a structural temperature difference compensation effect can be achieved through the characteristic of relatively easy deformation of the position of the expansion joint in combination with the slidable seal head tube plate, and structural damage is prevented from being caused due to excessively large temperature difference stress.

Description

technical field [0001] The invention belongs to the technical field of chemical heat exchange, and in particular relates to a double-pass heat exchanger. 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 outside the heat exchan...

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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