Detachable tube bundle type fail-safe heat exchanger

Abstract

The detachable tube bundle type fail-safe heat exchanger comprises a barrel, a shell side material inlet and a shell side material outlet are formed in the upper side of the barrel, and a fixed tube plate and a floating tube plate are arranged at the two ends of the barrel respectively; a plurality of heat exchange tubes are arranged between the fixed tube plate and the floating tube plate, a plurality of baffle plates are arranged on the outer sides of the plurality of heat exchange tubes, a plurality of pipe spacers are arranged among the plurality of baffle plates, and a slideway plate is arranged on the lower sides of the plurality of baffle plates; a first flange is arranged on the outer side of the floating tube plate, a sealing head is arranged on the outer side of the first flange, a sealing ring is arranged between the first flange and the floating tube plate, and emptying ports are formed in the upper portion and the lower portion of the first flange. And a tube box is arranged on the outer side of the fixed tube plate. According to the invention, leakage point monitoring can be carried out, and the tube bundle and the cylinder body can be detached.

Description

Technical Field

[0001] The invention belongs to the technical field of petrochemical equipment, and in particular relates to a detachable tube bundle type fail-safe heat exchanger. Background Art

[0002] With the rapid development of the petrochemical industry, the heat exchange equipment has long-term operation and higher safety and environmental protection requirements. For example, the safety warning and monitoring of heat exchangers need to be improved. In the production process, there are a large number of control points that need to be monitored for leakage, but it is often difficult for workers to find leakage points. Only by checking process control indicators or sampling and analysis can we determine whether there are leakage points in the heat exchanger. At the same time, the tube bundles of many heat exchangers are fixedly connected to the cylinder and cannot be disassembled, and the outer wall of the tube bundle cannot be cleaned, so it is necessary to invent a fail-safe heat exchanger with a detachable tube bundle. Summary of the invention

[0003] The object of the present invention is to provide a detachable tube bundle type fail-safe heat exchanger to solve the problem that leakage points are difficult to monitor and the tube bundle and the cylinder are fixed together and cannot be disassembled.

[0004] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present invention is: a detachable tube bundle type fail-safe heat exchanger, comprising a cylinder, a shell side material inlet and a shell side material outlet are arranged on the upper side of the cylinder, and a fixed tube sheet and a floating tube sheet are arranged at both ends of the cylinder respectively; a plurality of heat exchange tubes are arranged between the fixed tube sheet and the floating tube sheet, a plurality of baffles are arranged on the outer side of the plurality of heat exchange tubes, a plurality of distance tubes are arranged between the plurality of baffles, and a slide plate is arranged on the lower side of the plurality of baffles; a first flange is arranged on the outer side of the floating tube sheet, a head is arranged on the outer side of the first flange, a sealing ring is arranged between the first flange and the floating tube sheet, and venting and draining ports are arranged above and below the first flange; a pipe box is arranged on the outer side of the fixed tube sheet, a tube side medium inlet and a tube side medium outlet are arranged on the upper side of the pipe box, and exhaust and draining ports are respectively arranged on the upper and lower sides of the cylinder and the pipe box; a flat cover is arranged on the outer side of the pipe box; pipe plugs are arranged in the venting and draining ports and the exhaust and draining ports.

[0005] As a preferred technical solution of the present invention, connecting flanges are respectively provided at both ends of the cylinder, and second flanges are respectively provided at both ends of the pipe box, the first flange is connected to one connecting flange, and the other connecting flange is connected to a second flange; the flat cover is connected to the other second flange.

[0006] As a preferred technical solution of the present invention, a retaining ring is arranged between the first flange and the connecting flange connected to the first flange, and the sealing ring is located inside the retaining ring.

[0007] As a preferred technical solution of the present invention, the sealing ring is an O-ring.

[0008] As a preferred technical solution of the present invention, a plurality of supports are arranged on the lower side of the cylinder.

[0009] The beneficial effects of the present invention are as follows: the detachable tube bundle type fail-safe heat exchanger of the present invention has a detachable floating tube sheet to realize the cleanability of the heat transfer tube bundle (composed of multiple heat exchange tubes), exposes the location of the leakage fault point through fluid pressure, and has the advantages of easy adjustment, convenient operation, simple and reliable structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of a detachable tube bundle type fail-safe heat exchanger of the present invention;

[0011] Figure 2 It is a schematic diagram of the internal structure of the detachable tube bundle type fail-safe heat exchanger of the present invention.

[0012] In the figure: 1. Cylinder, 2. Shell side material outlet, 3. Connecting flange, 4. Sealing ring, 5. First flange, 6. Heat exchange tube, 7. Head, 8. Pipe plug, 9. Slide plate, 10. Retaining ring, 11. Support, 12. Baffle, 13. Distance tube, 14. Fixed tube sheet, 15. Flat cover, 16. Tube side medium inlet, 17. Second flange, 18. Shell side medium inlet, 19. Tube box, 20. Exhaust outlet, 21. Floating tube sheet. DETAILED DESCRIPTION

[0013] The present invention is further described in detail below in conjunction with the accompanying drawings, tables and specific embodiments. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0014] The present invention is further described below by way of examples, but is not limited to the following embodiments.

[0015] Example 1

[0016] like Figure 1 As shown, the detachable tube bundle type fail-safe heat exchanger of the present invention comprises a cylinder 1. The upper side of the cylinder 1 is provided with a shell side material inlet 18 and a shell side material outlet 2, and the two ends of the cylinder 1 are respectively provided with a fixed tube sheet 14 and a floating tube sheet 21.

[0017] Combination Figure 2, a plurality of heat exchange tubes 6 are arranged between the fixed tube sheet 14 and the floating tube sheet 21, a plurality of baffles 12 are arranged on the outside of the plurality of heat exchange tubes 6, a plurality of distance tubes 13 are arranged between the plurality of baffles 12, a slide plate 9 is arranged on the lower side of the plurality of baffles 12, and the slide plate 9 abuts against the inner side of the bottom of the cylinder 1. A first flange 5 is arranged on the outside of the floating tube sheet 21, a head 7 is arranged on the outside of the first flange 5, a sealing ring 4 is arranged between the first flange 5 and the floating tube sheet 21, and venting and draining ports are arranged above and below the first flange 5. A pipe box 19 is arranged on the outside of the fixed tube sheet 14, a tube side medium inlet 16 and a tube side medium outlet are arranged on the upper side of the pipe box 19, and exhaust and draining ports 20 are arranged on the upper and lower sides of the cylinder 1 and the pipe box 19, respectively. A flat cover 15 is arranged on the outside of the pipe box 19; pipe plugs 8 are arranged in the venting and draining ports and the exhaust and draining ports 20.

[0018] The shell-side medium flows through the baffles 12 installed around the heat exchange tubes 6 in a cross-flow form, while the tube-side medium flows inside the heat exchange tubes 6 .

[0019] The pressure gauge on the shell side is installed on the pipes of the shell side material inlet 18 and the shell side material outlet 2. The pressure gauge on the tube side is installed on the on-site pipeline. When the pressure is controlled, if the pressure increases, the following reasons may be the case: 1. On the tube side, dirt accumulates on the inner surface of the heat exchange tube 6; 2. On the shell side, dirt accumulates on the outer surface of the heat exchange tube 6. The outer diameter of the floating tube sheet 21 is smaller than the inner diameter of the cylinder 1. After closing the tube side and shell side media, the heat exchange tube 6 and the connected floating tube sheet 21 and the fixed tube sheet 14 can be taken out from one side of the fixed tube sheet 14. The heat exchange tube 6 can be cleaned with a wire brush or a nylon brush, and the remaining part can be cleaned with compressed air. After cleaning, it can be reassembled. The inner wall can also be cleaned after the shell side cuts off the fluid medium and drains it.

[0020] If shell-side medium appears between the fixed tube sheet 14 and the connecting flange 3, it indicates that a leakage fault occurs in the seal there, and the gasket between the fixed tube sheet 14 and the connecting flange 3 needs to be replaced; if shell-side medium appears at the exhaust outlet position on the first flange 5, it indicates that a leakage fault occurs at the position of the floating tube sheet 21 and the sealing ring 4, and the sealing ring 4 needs to be replaced.

[0021] The pressure gauges on the shell and tube sides are connected to the pressure controllers respectively. When the medium breaks through the cavity wall, the fluid pressure immediately propagates itself on the separation liquid to the pressure controller, through which the electrical switch will be activated. In this way, the leakage is announced and depending on the system alarm will be activated or the heat exchanger will be stopped, realizing the function of leakage fail-safe.

[0022] Example 2

[0023] like Figure 1As shown, different from Example 1, in the detachable tube bundle type fail-safe heat exchanger of the present invention, connecting flanges 3 are respectively provided at both ends of the cylinder 1, and second flanges 17 are respectively provided at both ends of the tube box 22. The first flange 5 is connected to one connecting flange 3 by a plurality of bolts, and the other connecting flange 3 is connected to one second flange 17 by a plurality of bolts; the flat cover 15 is connected to the other second flange 17 by a plurality of bolts.

[0024] This design allows for quick assembly and disassembly of components, is convenient to operate, and has a relatively high connection reliability.

[0025] Example 3

[0026] like Figure 1 As shown, different from Example 1, in the detachable tube bundle fail-safe heat exchanger of the present invention, a retaining ring 10 is arranged between the first flange 5 and the connecting flange 3 connected to the first flange 5 , and the sealing ring 4 is located inside the retaining ring 5 .

[0027] The retaining ring 10 can activate the function of the protective retaining ring 5 to prevent it from directly contacting the connecting flange 3 of the first flange 5 and causing wear.

[0028] Example 4

[0029] like Figure 1 As shown, different from Example 1, in the detachable tube bundle type fail-safe heat exchanger of the present invention, a plurality of supports 11 are provided on the lower side of the cylinder 1 to ensure that the cylinder 1 is stably supported.

[0030] Therefore, compared with the prior art, the detachable tube bundle type fail-safe heat exchanger of the present invention has a detachable floating tube sheet to realize the cleanability of the heat transfer tube bundle (composed of multiple heat exchange tubes), exposes the location of the leakage fault point through fluid pressure, and has the advantages of easy adjustment, convenient operation, simple and reliable structure.

[0031] The above description shows and describes several preferred embodiments of the invention, but as mentioned above, it should be understood that the invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention concept described herein through the above teachings or the technology or knowledge of the relevant field. Changes and modifications made by those skilled in the art should be within the scope of protection of the claims attached to the invention without departing from the spirit and scope of the invention.

Claims

1. Detachable tube bundle type fail-safe heat exchanger, characterized in that: It includes a cylinder, a shell side material inlet and a shell side material outlet are arranged on the upper side of the cylinder, and a fixed tube sheet and a floating tube sheet are arranged at both ends of the cylinder respectively; a plurality of heat exchange tubes are arranged between the fixed tube sheet and the floating tube sheet, a plurality of baffles are arranged on the outer sides of the plurality of heat exchange tubes, a plurality of distance tubes are arranged between the plurality of baffles, and a slide plate is arranged on the lower side of the plurality of baffles; a first flange is arranged on the outer side of the floating tube sheet, a head is arranged on the outer side of the first flange, a sealing ring is arranged between the first flange and the floating tube sheet, and venting and draining ports are arranged above and below the first flange; a pipe box is arranged on the outer side of the fixed tube sheet, a tube side medium inlet and a tube side medium outlet are arranged on the upper side of the pipe box, and exhaust and draining ports are arranged on the upper and lower sides of the cylinder and the pipe box respectively; a flat cover is arranged on the outer side of the pipe box; pipe plugs are arranged in the venting and draining ports and the exhaust and draining ports.

2. The detachable tube bundle type fail-safe heat exchanger according to claim 1, characterized in that: The two ends of the cylinder are respectively provided with connecting flanges, the two ends of the pipe box are respectively provided with second flanges, the first flange is connected to one connecting flange, the other connecting flange is connected to one second flange; the flat cover is connected to the other second flange.

3. The detachable tube bundle type fail-safe heat exchanger according to claim 2, characterized in that: A retaining ring is arranged between the first flange and a connecting flange connected to the first flange, and a sealing ring is located inside the retaining ring.

4. The detachable tube bundle type fail-safe heat exchanger according to claim 3, characterized in that: The sealing ring is an O-type sealing ring.

5. The detachable tube bundle type fail-safe heat exchanger according to claim 4, characterized in that: A plurality of supports are arranged on the lower side of the cylinder.

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