A connection structure of heat exchange tube and tube sheet for preventing crevice corrosion on shell side

Abstract

The present application discloses a heat exchange tube and tube sheet connection structure for preventing shell-side gap corrosion, including a tube sheet and a heat exchange tube, the tube sheet is provided with tube holes, and the tube sheet includes a tube sheet body, One side of the tube sheet body is the tube side, and the other side of the tube sheet body is the shell side, wherein the tube sheet also includes a A bidirectional composite layer composed of the first composite layer and the second composite layer preset on the inner wall of the tube hole, the heat exchange tube passes through the bidirectional composite layer and is fixed and sealed with the tube sheet. In this application, a reasonable structure is set on the shell side of the tube sheet to prevent the corrosive medium from penetrating into the gap between the tube sheet and the heat exchange tube, thereby achieving the purpose of preventing crevice corrosion and better improving the resistance of the tube bundle of the tube-and-tube heat exchanger. Corrosion performance, prolong the service life of the equipment, and the structure is simple and reliable.

Description

technical field [0001] The application relates to the field of heat exchange equipment in the air conditioning, coal chemical, and petrochemical industries, and in particular to a connection structure between heat exchange tubes and tube sheets for preventing shell-side crevice corrosion. Background technique [0002] The so-called crevice corrosion is that those fluids are easy to corrode in dead corners where there is no flow. Crevice corrosion is a form of localized corrosion that may occur in the gap where the solution is stagnant or in the shielded surface. Such gaps may form at metal-to-metal or metal-to-nonmetal junctions. In the manufacture of chemical equipment, the existence of gaps or dead angles as mentioned above should be avoided as much as possible, or measures should be taken to block gaps and dead angles to avoid crevice corrosion. [0003] In the prior art, the connection between the heat exchange tube and the tube sheet can be divided into expansion joint...

AI Technical Summary

Problems solved by technology

[0005] Therefore, in order to prevent the shell-side medium from entering the tube sheet through the expansion gap between the heat exchange tube and the hole of the tube sheet and corroding the tube sheet, the problems existing in the above-mentioned prior art were improved, and a suitable heat exchange method was developed. The connection scheme and structure of the tube and the tube sheet are particularly important to effectively prevent the technology of crevice corrosion

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