Shell-and-tube type heat exchanger with U-shaped tube-bundle vibration-proof device

Abstract

The invention relates to a shell-and-tube type heat exchanger with a U-shaped tube-bundle vibration-proof device, which comprises a U-shaped tube bundle, a tube shell and a tube box, wherein the U-shaped tube bundle comprises two straight tube-segment layers and a U-shaped tube-segment layer, the U-shaped tube-segment layer is in stepped arrangement, and the U-shaped tube-segment layer is provided with one or more than one group of vibration-proof assemblies; each vibration-proof assembly comprises a clamping piece, a central post, a limiting piece and a connecting piece, the clamping piece is respectively arranged between two adjacent U-shaped tube segments in the U-shaped tube-segment layer, one end of the clamping piece is arranged at the inner part of the U-shaped tube-segment layer, the other end of the clamping piece horizontally extends to the outer part of the U-shaped tube-segment layer, one ends of the clamping pieces are respectively provided with an installing hole, the central post is arranged in the installing hole in a penetrating way, both ends of the central post are respectively connected with the connecting pieces, and the limiting pieces are respectively arranged at both sides of each clamping piece and are fixedly connected with the connecting pieces. Compared with the prior art, the shell-and-tube type exchanger has the characteristics of simple structure, good structural rigidity, high tube-bundle quality and long service life.

Description

technical field [0001] The invention relates to the shell-and-tube heat exchanger technology in equipment engineering, in particular to a tube with a U-shaped tube bundle anti-vibration device specially used for heat exchange in petrochemical, coal chemical, fertilizer industry, air-conditioning and refrigeration, and electric power facilities. shell heat exchanger. Background technique [0002] In the prior art, the shell-and-tube heat exchanger is the most widely used heat exchanger. The shell-and-tube heat exchanger is also called the shell-and-tube heat exchanger or the shell-and-tube condenser, which is widely used in chemical industry, petroleum Convective heat transfer of "liquid-liquid", "steam-steam", "steam-liquid" heat exchange in the fields of medicine, food, light industry, metallurgy, coking, etc., as well as steam condensation and liquid evaporation heat transfer Wait for the heat exchange and condensation process. [0003] The usual structure of the shell a...

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Problems solved by technology

[0014](1) Due to the incomplete understanding of the mechanism of U-shaped tube bundle vibration, the theoretical background of various preventive measures against harmful vibration is unclear, which is specifically reflected in the support structure The above form is scattered, the size of the components is too large, which hinders the fluid flow, increases the flow resistance, or there is a flow stagnation dead zone, resulting in a decrease in heat transfer efficiency; In the heat exchanger, when the tube sheet is heated unevenly in different tube passes, the thermal stress of different quadrants and the restraint force of the strength welding between the heat exchange tube and the tube sheet are superimposed. If the thermal expansion of the U-shaped tube cannot be freely elongated, Strong shear stress will be generated inside the tube sheet, which will lead to fatigue cracks from the weak link of the tube sheet; (3) the strength design of the general tube sheet itself and the connection strength design of the heat exchange tube and the tube head do not consider the same U If the thermal stress caused by different U-shaped pipe sections in the U-shaped pipe bundle is superimposed on the original design load, the original structural design strength may not be sufficient, so the anti-vibration support structure of the U-shaped pipe sections should not be different. The heat exchange tubes in the tube side are forced to be involved with each other, and they should be able to stretch freely along the axial direction of the tube bundle; (4) Due to the uncontrolled structural deviation of the anti-vibration device, many structures cannot meet the design requirements; ( 5) Only mandatory measures are taken for the U-shaped pipe section, which makes the anti-vibration effect unsatisfactory

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