Shell pass inlet anti-impact and anti-vibration device for shell-and-tube heat exchanger

Abstract

The invention discloses a shell-and-tube heat exchanger shell pass inlet scour-proof and vibration-proof device which comprises a barrel, a buffer assembly and an adjusting assembly, an inlet pipe is arranged on the barrel, and the buffer assembly comprises a scour-proof plate located in the barrel, fan blades located on the upper portion of the scour-proof plate and a first supporting column connected with the scour-proof plate. The impingement plate is fixedly connected with the barrel through a first supporting column, the middle of the fan blade is fixedly sleeved with a rotating shaft, the rotating shaft is rotationally connected with the impingement plate, and the adjusting assembly is connected with the barrel through the buffering assembly. Pressure loss of fluid at an inlet of the inlet pipe can be reduced through the buffer assembly, impact of the fluid on the heat exchange pipe is relieved, the situation that the pressure difference between the upper side and the lower side of the arc-shaped impingement plate is too large, a vortex flow field is formed, and energy loss is increased is avoided, the fluid can evenly enter a pipe bundle area of the heat exchange pipe, equipment vibration is reduced, and the impact resistance of the equipment is improved; and stable operation of the device is ensured.

Description

technical field [0001] The invention relates to the technical field of heat exchangers, in particular to a shell-side inlet anti-shock and anti-vibration device of a shell-and-tube heat exchanger. Background technique [0002] According to statistics, in the modern chemical industry, the investment in heat exchangers accounts for about 30% of the total equipment investment, and in oil refineries, it accounts for about 40% of all process equipment. Seawater desalination process devices are almost all composed of heat exchangers. , surveys in domestic and foreign markets show that although the competitiveness of various plate heat exchangers is rising, shell and tube heat exchangers still dominate, accounting for about 64%. In my country's petrochemical industry, shell-and-tube heat exchangers are the most used equipment in heat exchange equipment, and more than 80% of the shell-and-tube heat exchangers still use bow-shaped baffles. [0003] In recent years, domestic and fore...

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Problems solved by technology

[0003] In recent years, domestic and foreign scholars have successively conducted research on the anti-scour plate of the shell-and-tube heat exchanger. Impact heat exchange tubes and avoid heat exchange tube vibration; Wu Jianping pointed out in "Ethylene Heat Exchanger Leakage Failure Analysis and Countermeasures" that the unreasonable design of the anti-shock plate will directly lead to vortex and side flow of the fluid in the shell, resulting in erosion and vibration ; Zhu Yonghong pointed out in the article "Discussion on Several Issues about Bellows Heat Exchangers" that for bellows heat exchangers, the tube wall is thin and the rigidity is poor. In order to prevent the direct erosion of the medium, the medium inlet must be equipped with anti-scour Zhang Cheng pointed out in "Analysis and Design Optimization of Titanium Heat Exchanger Structure" that the main reason for the failure of the shell-side anti-scouring plate is that the area of ​​the anti-scouring plate is too large, resulting in a large impact force of the fluid, which directly caused the anti-scouring plate. The fracture of the weld seam between the plate and the shell, the fluid flow rate in the shell side is unstable, and the anti-shock plate is subjected to alternating loads, which leads to the failure of the weld seam; The method of numerical simulation shows that the maximum head pressure area is at the upper center of the anti-shock plate, and the minimum head pressure area is at the lower part of the anti-shock plate near the head wall, and the large pressure difference between the upper and lower sides forms an annular vortex flow field, so that The air flow increases energy loss in the flow, resulting in an increase in pressure drop; Liu Xiaoling analyzed the cross-flow velocity and tube bundle vibration frequency with and without adding anti-shock in the article "Vibration Analysis of Shell-side Inlet Anti-Shoot Plate of Shell-and-Tube Heat Exchanger" According to the calculation, it is concluded that the addition of the anti-shock plate can protect the tube bundle at the inlet to a certain extent, but it reduces the effective flow area of ​​the fluid at the inlet, which increases the cross-flow velocity of the fluid here, which may induce vortex shedding excitation and fluid elastic instability ; Wang Jianming used numerical simulation methods in the article "Study on the Homogenization Performance of the Inlet Flow Field of Marine Shell-and-Tube Condenser", and concluded that at high Reynolds numbers, the addition of anti-scouring plates is beneficial to enhance heat transfer

[0004] At present, although a large number of scholars have done a lot of research on the shell-side inlet anti-shock plate of the shell-and-tube heat exchanger, most of them solve the impact force and vibration of the fluid on the anti-shock plate by changing the shape and size of the anti-shock plate. However, the effect of alleviating the shock and vibration through the anti-shock plate is not good. Based on this, we propose an anti-shock and anti-vibration device for the shell-side inlet of the shell-and-tube heat exchanger.

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