Fixed tube-sheet tubular heat exchanger detached to wash

Abstract

The invention discloses a fixed tube-sheet tubular heat exchanger detached to wash. An upper head (7) and a lower head (12) are connected to the top and bottom of a cylinder (1) respectively to form a heat exchanger body. An upper main tube sheet (3) and a lower main tube sheet (15) are arranged between the cylinder (1) and the upper head (7) as well as between the cylinder (1) and the lower head (12) respectively. A plurality of upper auxiliary tube sheets (8) are disposed on the upper main tube sheet (3). A plurality of lower auxiliary tube sheets (18) are arranged on the lower main tube sheet (15). The upper auxiliary tube sheets (8) and the lower auxiliary tube sheets (18) are paired. Center connecting lines for the paired upper and lower auxiliary tube sheets (8) and (18) are parallel to the center line of the cylinder (1). The upper auxiliary tube sheets (8) are connected with the upper main tube sheet (3) through bolts (9). The lower auxiliary tube sheets (18) are connected with the lower main tube sheet (15) through bolts (21). Auxiliary tube-sheet heat exchange tubes (2) are connected between the paired upper and lower auxiliary tube sheets (8) and (18). The fixed tube-sheet tubular heat exchanger detached to wash is simple and compact in structure, capable of bearing higher load, low in manufacturing cost, available for detachment to wash and suitable for tube side and shell side positions which easily scale and require washing.

Description

technical field [0001] The invention relates to a heat exchanger, in particular to a detachable fixed tube-sheet type tube-and-tube heat exchanger which is easy to clean. Background technique [0002] The fixed tube-sheet heat exchanger is also called the shell-and-tube fixed tube-sheet heat exchanger. Convenient, easy to block or replace when the tube is damaged; especially when the tube is damaged, it can be easily replaced, and the scrap rate of the heat exchanger is low. [0003] The disadvantage of the shell-and-tube fixed tube-sheet heat exchanger is that when the wall of the tube bundle and the shell is stable or the linear expansion coefficient of the material differs greatly, the shell and the tube bundle will generate large thermal stress. In addition, the shell-side cleaning inconvenient. [0004] The thermal stress problem of the fixed tube-sheet heat exchanger can be solved by adding expansion joints on the shell. [0005] At present, the method to solve the ...

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Problems solved by technology

[0003] The disadvantage of the shell-and-tube fixed tube-sheet heat exchanger is that when the wall of the tube bundle and the shell is stable or the linear expansion coefficient of the material differs greatly, the shell and the tube bundle will generate large thermal stress. In addition, the shell-side cleaning inconvenient

[0006] The advantage of the floating head heat exchanger is that it is easy to clean between the tubes and the inside of the tube, and will not generate thermal stress; but its structure is complex, the cost is higher than that of the fixed tube-sheet heat exchanger, the equipment is heavy, the material consumption is large, and the small cover of the floating head is in operation. Unable to inspect, higher requirements for sealing during manufacture

[0007] The characteristic of the U-shaped tube heat exchanger is that there is only one tube plate, and the two ends of the tube are fixed on the same tube plate, and the tube can expand and contract freely without generating thermal stress; Due to the limitation of the radius of curvature of the bent tube, the innermost tube spacing of the tube bundle with fewer heat exchange tubes is relatively large, the utilization rate of the tube sheet is low, and the shell-side fluid is easy to form a short circuit, which is not good for heat transfer. When the tube leaks and is damaged, Only the U-shaped tubes at the periphery of the tube bundle can be replaced. If the inner heat exchange tube is broken, it cannot be replaced, but can only be blocked. The scrap rate of the heat exchanger is high

[0008] Furthermore, under some working conditions, the heat exchange medium is highly corrosive, and the heat exchanger needs to be made of expensive alloy materials, and the cost of the equipment needs to be limited; when the working pressure is high and the mass transfer efficiency is high When using a shell-and-tube fixed tube-sheet heat exchanger, but when the tube and shell materials are prone to fouling, it is necessary to solve the cleaning problem of the shell

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