Air cooler tube box

Abstract

The utility model relates to a pipe box of an air cooler, which is characterized in that a pipe plug plate, an upper side plate, a lower side plate, a left end plate, a right end plate and a pipe plate form a box body, a square flange is fixed, the square flange and the pipe plate are connected and fastened through a double-end stud and a nut, a heat exchange pipe penetrates into the pipe plate, a pipe plug hole is arranged on the pipe plug plate, a pipe plug is arranged in the pipe plug hole, and an annular pipe plug gasket is sleeved on the pipe plug. The heat exchange tube is made of corrosion-resistant alloy, a corrosion-resistant alloy layer is arranged on the inner side of the tube plate, one end of the heat exchange tube penetrates through the tube plate and then is welded with a through hole of the corrosion-resistant alloy layer, and the box body is made of carbon steel or low alloy steel except the corrosion-resistant alloy layer. The utility model has the following beneficial effects: through combination of different materials, the corrosion problem is solved, long-period safe operation can be realized, and equipment investment is greatly reduced; and on-site single-pipe leaking stoppage can be achieved, and the difficulty of on-site maintenance of equipment is lowered.

Description

Technical Field

[0001] The utility model belongs to the technical field of air coolers and relates to a pipe box structure of an air cooler. Background Art

[0002] In the petroleum and chemical industries, air coolers are a key component of heat dissipation and temperature regulation in production. To address corrosion issues with process media, air cooler tube bundles are typically constructed of corrosion-resistant alloys. Fins are placed around the outer edges of the corrosion-resistant alloy steel tubes to dissipate heat and cool the media within. Depending on the media's corrosion potential, different corrosion-resistant alloys can be used for the tube bundle; for the same media, different combinations of corrosion-resistant alloys can also be used in different parts of the tube bundle. This is particularly true for medium- and high-pressure air coolers in hydrogenation units. Due to the deterioration of crude oil processed in recent years, unplanned downtime caused by corrosion has become increasingly severe, necessitating the use of more corrosion-resistant materials. Currently, the prevailing approach, both domestically and internationally, is to improve the overall material quality of the tube bundle to address corrosion. However, this results in significant investment increases, making it a key challenge to minimize the use of expensive alloy materials while ensuring the long-term safe operation of the equipment.

[0003] Therefore, the present invention proposes an air cooler tube box. Utility Model Content

[0004] The purpose of the utility model is to solve the problems existing in the prior art and to propose an air cooler tube box with a simple structure and corrosion resistance, which together with corrosion-resistant alloy finned tubes constitutes a tube bundle of the air cooler.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions: an air cooler tube box, the tube box body is a rectangular box, which is composed of a plugging plate, two upper and lower side plates, two left and right end plates, and a tube plate. The upper and lower side plates and the left and right end plates are fixed with square flanges, and the square flanges are fastened to the tube plate by studs and nuts. The heat exchange tubes are inserted into the tube plate, and plugging holes are provided on the plugging plate. Plugs are installed in the plugging holes, and the plugs are sleeved with an annular plugging gasket. The heat exchange tube material is a corrosion-resistant alloy, and a corrosion-resistant alloy layer is provided on the inner side of the tube plate. The outside of the corrosion-resistant alloy layer is a base plate. After one end of the heat exchange tube passes through the tube plate, it is welded to the perforation of the corrosion-resistant alloy layer. The plugging plate, the upper and lower side plates, the left and right end plates, and the base plate are all made of carbon steel or low-alloy steel.

[0006] Furthermore, the tube sheet is sealed with the upper and lower side plates and the left and right end plates by using a square-shaped sealing gasket.

[0007] Furthermore, the heat exchange tubes are composed of base tubes and fins, and the fins are fixed on the base tubes outside the tube sheet.

[0008] Furthermore, the corrosion-resistant alloy layer is perforated and cut to form a tapered surface, and the tapered surface is used to fix the solder.

[0009] The beneficial effects of the present invention are as follows: through the combination of different materials, it not only solves the corrosion problem faced by the air cooler, but also can achieve long-term safe operation, which is in line with the current actual situation at home and abroad that safety and environmental protection issues are increasingly valued; it also greatly reduces equipment investment, and the economy is very obvious; it can also achieve on-site single-pipe plugging, reducing the difficulty of on-site maintenance of equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural diagram of the utility model;

[0011] Figure 2 Schematic diagram of the plug sealing structure;

[0012] Figure 3 Schematic diagram of the connection structure between the heat exchange tube and the tube sheet;

[0013] In the figure: 1 tube sheet, 1-1 base plate, 1-2 corrosion-resistant alloy layer, 2 U-shaped sealing gasket, 3 square flange, 4 tube box body, 4-1 plug plate, 4-2 upper and lower side plates, 4-3 left and right end plates, 5 plugs, 6 plug gaskets, 7 nuts, 8 studs, 9 heat exchange tubes, 9-1 base tubes, 9-2 fins, 10 self-centering cone. DETAILED DESCRIPTION

[0014] The following is a clear and complete description of the technical solution of the present invention with reference to the accompanying drawings:

[0015] Reference Figure 1 , an air cooler tube box, the tube box body 4 is a rectangular box, including a tube sheet 1, a heat exchange tube 9, a square flange 3, a mouth-shaped sealing gasket 2, a screw plug 5, and a screw plug gasket 6. It is a screw plug cap type tube box.

[0016] The tube box body 4 is comprised of a plug plate 4-1, two upper and lower side plates 4-2, two left and right end plates 4-3, and the tube sheet 1. Square flanges 3 are welded to the edges of the upper and lower side plates 4-2 and the left and right end plates 4-3. Studs 8 pass through the square flanges 3 and the through-holes of the tube sheet 1, and are secured at both ends with nuts 7. Heat exchange tubes 9 pass through the tube sheet 1. The plug plate 4-1 is provided with plug holes, into which plugs 5 are installed. These plugs are fitted with annular plug gaskets 6, which are fitted with self-centering cones 10. These cones ensure that the plug gaskets 6 are accurately positioned within the countersunk surface of the plug plate 4-1. The tube sheet 1 is sealed against the upper and lower side plates 4-2 and the left and right end plates 4-3 by square-shaped gaskets 2.

[0017] The tube sheet 1 is equipped with a corrosion-resistant alloy layer 1-2 on the inside, and a base plate 1-1 on the outside of the corrosion-resistant alloy layer 1-2. One end of the heat exchange tube 9 passes through the tube sheet 1 and is welded to a perforation in the corrosion-resistant alloy layer 1-2. To ensure weld stability, the perforation in the corrosion-resistant alloy layer 1-2 is perforated with a tapered surface to accommodate the solder. The base plate 1-1 and corrosion-resistant alloy layer 1-2 are bonded together using methods such as explosion or explosion-rolling.

[0018] The heat exchange tubes 9 are made of a corrosion-resistant alloy and consist of base tubes 9-1 and fins 9-2. Fins 9-2 are wound, rolled, or welded onto the base tubes 9-1 on the outside of the tube sheet 1. All components of the tube box 4, except the tube sheet, are made of carbon steel or low-alloy steel. Only the tube sheet 1 is constructed with a composite corrosion-resistant layer.

[0019] The utility model improves the service life of the air cooler tube bundle. It combines the corrosion-resistant alloy heat exchange tube 9, and on the premise that the corrosion resistance of the heat exchange tube 9 is guaranteed, the corrosion resistance of the welded joint between the heat exchange tube 9 and the tube sheet 1 is also guaranteed.

[0020] The tube bundle of the utility model adopts a combined structural design. Compared with the tube box made entirely of corrosion-resistant alloy plates welded together, it greatly reduces the use of expensive corrosion-resistant alloys, reduces the investment in the air cooler tube bundle, and also meets the long-term safe operation of the equipment.

[0021] The tube bundle manufactured by the air cooler tube box of the utility model can realize on-site single-tube leak plugging, thereby reducing the difficulty of on-site maintenance of the equipment.

Claims

1. An air cooler tube box, wherein the tube box body (4) is a rectangular box, and is composed of a plug plate (4-1), two upper and lower side plates (4-2), two left and right end plates (4-3), and a tube plate (1). The upper and lower side plates (4-2) and the left and right end plates (4-3) are fixed with square flanges (3), and the square flanges (3) are fastened to the tube plate (1) by studs (8) and nuts (7). A heat exchange tube (9) is passed through the tube plate (1), a plug hole is provided on the plug plate (4-1), a plug (5) is installed in the plug hole, and the plug (5) is covered with an annular plug gasket (6). The heat exchange tube (9) is made of a corrosion-resistant alloy, and is characterized in that: A corrosion-resistant alloy layer (1-2) is provided on the inner side of the tube sheet (1), and a base plate (1-1) is provided on the outer side of the corrosion-resistant alloy layer (1-2). One end of the heat exchange tube (9) passes through the tube sheet (1) and is welded to a perforation of the corrosion-resistant alloy layer (1-2). The plug plate (4-1), the upper and lower side plates (4-2), the left and right end plates (4-3), and the base plate (1-1) are all made of carbon steel or low alloy steel.

2. The air cooler tube box according to claim 1, characterized in that: The tube sheet (1) is sealed with the upper and lower side plates (4-2) and the left and right end plates (4-3) by means of a square-shaped sealing gasket (2).

3. The air cooler tube box according to claim 1, characterized in that: The heat exchange tube (9) is composed of a base tube (9-1) and fins (9-2), and the fins (9-2) are fixed on the base tube (9-1) outside the tube plate (1).

4. The air cooler tube box according to claim 1, characterized in that: The corrosion-resistant alloy layer (1-2) is perforated and cut to form a tapered surface, and the tapered surface is used to fix the solder.

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