Jacketed heat exchanger

Abstract

The utility model provides a jacketed heat exchanger, which relates to the technical field of polycrystalline silicon reduction tail gas cooling and comprises an inner pipe and an outer pipe which are sleeved with each other. Two ends of the inner pipe are respectively a tail gas inlet and a tail gas outlet; the two ends of the outer pipe are connected with a water inlet and a water return port respectively, and a first straight section, a second straight section, a third straight section, a snakelike section and a fourth straight section which are sequentially connected are arranged between the two ends of the outer pipe; the water return port is arranged close to the tail gas inlet, so that the distance between the water return port and the tail gas inlet is shortened, and a cavitation dead zone is eliminated as much as possible. Expansion joints are arranged on the first straight section and / or the third straight section, so that local welding stress and expansion stress are eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of cooling tail gas from polysilicon reduction, in particular to a jacketed heat exchanger. Background Art

[0002] See also Figure 1 , the conventional jacketed heat exchanger adopts a serpentine jacketed heat exchanger. This equipment has the following defects during use:

[0003] 1. The design position of the jacket water return port 73 (connected to the outer pipe 72) is unreasonable. The jacket water return port 73 is far away from the exhaust gas inlet 74. There is a cavitation dead zone 76 between the jacket water return port 73 and the exhaust gas inlet 74, which can easily cause faults such as fracture of nearby welds.

[0004] 2. Local welding stress and expansion stress cannot be eliminated, and there is a risk of weld fracture.

[0005] 3. The spacer 77 between the inner tube 71 and the outer tube 72 is welded to the inner tube 71. Since spot welding is prone to defects such as cracks and damage to the inner tube 71, there is a problem of cross-flow of media between the inner and outer tubes 72 (leakage of the inner tube 71).

[0006] 4. The 180° elbows of the inner tube 71 (for conveying high-temperature polysilicon reduction tail gas) and the outer tube 72 (for conveying hot water for cooling) are welded with two 90° elbows 78, which has many welding points and is prone to leakage.

[0007] 5. The weight of the flange cover 79 at the inspection port exceeds the physical strength of a person, which may easily cause safety incidents such as slipping and injuring the feet of the maintenance workers.

[0008] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or any form of implication that the information constitutes the prior art known to those skilled in the art. Utility Model Content

[0009] In view of the above situation, the utility model provides a jacketed heat exchanger, aiming to solve at least one defect pointed out in the above background technology.

[0010] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0011] The utility model provides a jacketed heat exchanger, comprising a sleeved inner tube and an outer tube;

[0012] The two ends of the inner tube are the exhaust gas inlet and the exhaust gas outlet respectively;

[0013] The two ends of the outer tube are respectively connected with a water inlet and a water return port, and the two ends of the outer tube include a first straight section, a second straight section, a third straight section, a serpentine section and a fourth straight section which are connected in sequence;

[0014] Wherein, the water return port is arranged close to the tail gas inlet; and an expansion joint is arranged on the first straight section and / or the third straight section.

[0015] In some embodiments of the present invention, a temperature measuring port is provided on the outer tube near the exhaust gas inlet.

[0016] In some embodiments of the present invention, the water return port is located between the exhaust gas inlet and the temperature measuring port.

[0017] In some embodiments of the present invention, a spacer is provided between the inner tube and the outer tube.

[0018] In some embodiments of the present invention, the spacer is welded on the outer tube.

[0019] In some embodiments of the present invention, an inspection port is provided on the first straight section and / or the third straight section, and the inspection port is detachably connected to a flange cover.

[0020] In some embodiments of the present invention, a handle is provided on the flange cover.

[0021] In some embodiments of the present invention, an inspection port is provided at the head end and / or the tail end of the serpentine segment, and the inspection port is detachably connected to a flange cover.

[0022] In some embodiments of the present invention, a handle is provided on the flange cover.

[0023] In some embodiments of the present invention, the serpentine section has an integrally formed 180° elbow.

[0024] The embodiments of the present invention have at least the following advantages or beneficial effects:

[0025] 1. The water return port is set close to the exhaust gas inlet, which shortens the distance between the water return port and the exhaust gas inlet to eliminate the cavitation dead zone as much as possible.

[0026] 2. By setting the expansion joint, local welding stress and expansion stress are eliminated.

[0027] Other features and advantages of the present invention will be set forth in the following description, and in part will become apparent from the description, or may be understood by practicing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 It is a structural schematic diagram of an existing heat exchanger;

[0030] Figure 2 It is a structural schematic diagram of a gasket of an existing heat exchanger;

[0031] Figure 3 A schematic diagram of the structure of a jacketed heat exchanger provided in an embodiment of the present application;

[0032] Figure 4 It is a schematic diagram of the structure in which the gasket is welded on the outer tube;

[0033] Figure 5 It is a structural schematic diagram of a 180° elbow.

[0034] Figure 1 and Figure 2 Icons in:

[0035] 71-inner pipe, 72-outer pipe, 73-jacket water return port, 74-exhaust gas inlet, 75-exhaust gas outlet, 76-cavitation dead zone, 77-gasket, 78-90°elbow, 79-flange cover.

[0036] Figure 3~Figure 5 Icons in:

[0037] 1-inner pipe, 11-exhaust gas inlet, 12-exhaust gas outlet,

[0038] 2-outer pipe, 21-water inlet, 22-first straight section, 23-second straight section, 24-third straight section, 25-serpentine section, 251-180° elbow, 26-fourth straight section, 27-water return port, 28-temperature measuring port,

[0039] 3- pad, 4- expansion joint, 5- vent,

[0040] 6-inspection port, 61-flange cover, 62-handle. DETAILED DESCRIPTION

[0041] In the following, only some exemplary embodiments are briefly described. As those skilled in the art can appreciate, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present invention.

[0042] In the description of the embodiments of the present utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0043] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0044] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0045] See also Figure 1 to Figure 5 The present embodiment provides a jacketed heat exchanger, comprising an inner tube 1 and an outer tube 2 which are connected in a sleeve manner. The inner tube 1 is used to transport high-temperature polysilicon reduction exhaust gas, and the outer tube 2 is used to transport hot exchange water for cooling. The two ends of the inner tube 1 are respectively an exhaust gas inlet 11 and an exhaust gas outlet 12, and the two ends of the outer tube 2 are respectively connected with a water inlet 21 and a water return port 27. The two ends of the outer tube 2 include a first straight section 22, a second straight section 23, a third straight section 24, a serpentine section 25 and a fourth straight section 26 which are connected in sequence. Accordingly, the shape of the inner tube 1 is adapted to the outer tube 2.

[0046] A spacer block 3 is provided between the inner tube 1 and the outer tube 2, and the spacer block 3 serves to separate and position the inner tube 1 and the outer tube 2; specifically, the spacer block 3 is welded to the outer tube 2 to avoid damaging the inner tube 1 and causing the problem of cross-flow of the media in the inner and outer tubes 2 (even if the outer tube 2 is damaged due to welding of the spacer block 3, only the outer tube 2 leaks to the outside).

[0047] The water return port 27 is arranged close to the exhaust gas inlet 11, which shortens the distance between the water return port 27 and the exhaust gas inlet 11 to minimize the cavitation dead zone. In a specific implementation scenario, a temperature measuring port 28 is provided on the outer tube 2 near the exhaust gas inlet 11, and the water return port 27 is located between the exhaust gas inlet 11 and the temperature measuring port 28.

[0048] An expansion joint 4 is provided on the first straight section 22 and / or the third straight section 24 to eliminate local welding stress and expansion stress (the welds on the first straight section 22 and the third straight section 24 may break easily due to the inability to eliminate local welding stress and expansion stress).

[0049] The third straight section 24 is provided with a drain port 5 for draining the water in the outer tube 2 .

[0050] An inspection port 6 is provided on the first straight section 22 and / or the third straight section 24. The inspection port 6 is detachably connected to a flange cover 61. A handle 62 is provided on the flange cover 61 (originally there was no handle 62) to facilitate the maintenance personnel to grasp and prevent the flange cover 61 from slipping and hitting the feet of the maintenance workers.

[0051] An inspection port 6 is provided at the head end and / or tail end of the serpentine section 25, and the inspection port 6 is detachably connected to a flange cover 61, and a handle 62 is provided on the flange cover 61 (originally there was no handle 62), so that maintenance personnel can grasp it and avoid the flange cover 61 from slipping and hitting the feet of maintenance personnel.

[0052] The serpentine section 25 has an integrally formed 180° elbow 251 , which reduces welding points and effectively reduces the risk of leakage compared to the prior art.

[0053] In combination with the above content, this embodiment has at least the following beneficial effects:

[0054] First, the water return port 27 is arranged close to the exhaust gas inlet 11, which shortens the distance between the water return port 27 and the exhaust gas inlet 11, so as to eliminate the cavitation dead zone as much as possible.

[0055] Second, by setting the expansion joint 4, local welding stress and expansion stress are eliminated.

[0056] 3. The spacer 3 is welded on the outer tube 2 to avoid damaging the inner tube 1 and causing the problem of cross flow of media in the inner and outer tubes 2.

[0057] Fourth, the serpentine section 25 adopts an integrally formed 180° elbow 251, which reduces welding points and effectively reduces the risk of leakage.

[0058] 5. A handle 62 is provided on the flange cover 61 of the inspection opening 6 to facilitate the maintenance personnel to grasp it and prevent the flange cover 61 from slipping and hitting the feet of the maintenance workers.

[0059] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. In the absence of conflicts, the embodiments of the present application and the features in the embodiments may be combined with each other at will. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A jacketed heat exchanger, characterized in that: It includes an inner tube and an outer tube which are sleeved together; The two ends of the inner tube are respectively an exhaust gas inlet and an exhaust gas outlet; The two ends of the outer tube are respectively connected with a water inlet and a water return port, and the two ends of the outer tube include a first straight section, a second straight section, a third straight section, a serpentine section and a fourth straight section connected in sequence; Wherein, the water return port is arranged close to the exhaust gas inlet; and an expansion joint is arranged on the first straight section and / or the third straight section.

2. The jacketed heat exchanger according to claim 1, characterized in that: A temperature measuring port is provided on the outer tube near the tail gas inlet.

3. The jacketed heat exchanger according to claim 2, characterized in that: The water return port is located between the tail gas inlet and the temperature measuring port.

4. The jacketed heat exchanger according to claim 1, characterized in that: A cushion block is arranged between the inner tube and the outer tube.

5. The jacketed heat exchanger according to claim 4, characterized in that: The cushion block is welded on the outer tube.

6. The jacketed heat exchanger according to claim 1, characterized in that: An inspection port is provided on the first straight section and / or the third straight section, and a flange cover is detachably connected to the inspection port.

7. The jacketed heat exchanger according to claim 6, characterized in that: The flange cover is provided with a handle.

8. The jacketed heat exchanger according to claim 1, characterized in that: The head end and / or tail end of the serpentine section is provided with an inspection port, and the inspection port is detachably connected with a flange cover.

9. The jacketed heat exchanger according to claim 8, characterized in that: The flange cover is provided with a handle.

10. The jacketed heat exchanger according to claim 1, characterized in that: The serpentine section has an integrally formed 180° elbow.

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