Heat exchanger for compressed natural gas decompressor

Abstract

The utility model discloses a heat exchanger for compressed natural gas decompressor, which comprises a heat exchanger shell, a partition plate, a heat transfer tube bundle and a baffle plate, the right end of the heat exchanger shell is fixedly connected with a tube plate, the right side of the tube plate is fixedly connected with a tube box, and the left end of the heat exchanger shell is fixedly connected with an end socket. According to the heat exchanger for the compressed natural gas decompression device, natural gas can enter the pipe box through the gas inlet pipe, and after being blocked by the partition plate, the natural gas enters from one end of the heat transfer pipe bundle and then is exhausted from the other end of the heat transfer pipe bundle, and when the gas outlet pipe is connected with an external pipeline, the natural gas is conveniently exhausted to a designated position; the second butt-joint pipe can be connected with an external hot water pipeline, so that hot water enters the heat exchanger shell, is guided by the baffle plate and then is discharged from the second butt-joint pipe, heat exchange between natural gas in the heat transfer pipe bundle and the hot water is facilitated, the temperature of the natural gas is increased, the pressure of the natural gas is reduced, and smooth pressure reduction is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a heat exchanger for a compressed natural gas decompression device. Background Art

[0002] A natural gas pressure reducing device is a device used to process high-pressure compressed natural gas. Heat exchangers are particularly important in compressed natural gas (CNG) pressure reducing devices. Since the CNG pressure reducing process is an endothermic process, if sufficient heat exchange is not performed, the pipeline may become frosted or ice-blocked, seriously affecting the safety of the pressure reducing equipment and the process. Therefore, before pressure reducing, the natural gas must be heated through a heat exchanger to increase its temperature and reduce its pressure, thereby ensuring the smooth progress of the pressure reducing process.

[0003] In existing heat exchangers, after a long period of heat exchange through hot water media, scaling will appear inside the heat exchanger and on the surface of the heat transfer tube bundle. In severe cases, it will affect the heat transfer efficiency of the tube bundle. Users need to manually clean the surface regularly, which requires the heat exchanger to be disassembled and assembled, which is relatively inefficient to use. Therefore, further optimization is made to address the above problems. Utility Model Content

[0004] In view of the deficiencies in the prior art, the present invention provides a heat exchanger for a compressed natural gas pressure reducing device, which solves the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a heat exchanger for a compressed natural gas pressure reducing device, comprising a heat exchanger shell, a partition, a heat transfer tube bundle and a baffle, the right end of the heat exchanger shell is fixedly connected to a tube sheet, the right side of the tube sheet is fixedly connected to a tube box, and the left end of the heat exchanger shell is fixedly connected to a head, the partition is fixedly connected to the middle part of the inner wall of the tube box, one end of which passes through the tube sheet and extends to the interior of the heat exchanger shell, the baffle is equidistantly arranged on the inner wall of the heat exchanger shell and the surface of the partition, the heat transfer tube bundle is arranged on the surface of the baffle, the outer wall of the right end of the heat exchanger shell is fixedly connected to a docking pipe 1 and a docking pipe 2, the outer wall of the tube box is fixedly connected to an air inlet pipe and an air outlet pipe, a cleaning component is provided on the surface of the heat transfer tube bundle, and a driving component is provided inside the heat exchanger shell, and is used to drive the cleaning component to clean the heat transfer tube bundle.

[0006] The utility model has the following beneficial effects:

[0007] The heat exchanger for the compressed natural gas decompression device allows natural gas to enter the interior of the tube box through the inlet pipe. After being blocked by the partition plate, the natural gas enters from one end of the heat transfer tube bundle and then exits from the other end. When the outlet pipe is connected to the external pipeline, it is convenient to discharge it to the designated position. The second connecting pipe can be connected to the external hot water pipeline, enabling hot water to enter the interior of the heat exchanger housing. After being guided by the baffle plate, it exits from the second connecting pipe, facilitating the heat exchange between the natural gas in the heat transfer tube bundle and the hot water, thereby increasing its temperature and reducing its pressure to ensure the smooth progress of the decompression process;

[0008] The driving component can drive the cleaning component to move on the surface of the heat transfer tube bundle, facilitating the cleaning of the scale on its surface. This not only improves the heat exchange efficiency of the heat transfer tube bundle but also avoids the problem of manual disassembly and cleaning, making it more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a three-dimensional structural schematic diagram of the heat exchanger housing of the present utility model;

[0010] Figure 2 It is a sectional structural schematic diagram of the heat exchanger housing of the present utility model;

[0011] Figure 3 It is a side view structural schematic diagram of the heat exchanger housing of the present utility model;

[0012] Figure 4 It is a partially sectional structural schematic diagram of the positioning frame of the present utility model;

[0013] Among them, 1. Heat exchanger housing; 2. Partition plate; 3. Heat transfer tube bundle; 4. Baffle plate; 5. Tube sheet; 6. Tube box; 7. Head; 8. First connecting pipe; 9. Cross impeller; 10. Second connecting pipe; 11. Inlet pipe; 12. Outlet pipe; 13. Driving block; 14. Gear rod; 15. Threaded rod; 16. Link; 17. Positioning frame; 18. Cleaning ring; 19. Driving ring; 20. Upper clamping ring; 21. Lower clamping ring; 22. Auxiliary frame. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0015] Please refer to Figures 1 to 4, the present utility model provides a heat exchanger for a compressed natural gas decompression device; it includes a heat exchanger housing 1, a partition plate 2, a heat transfer tube bundle 3, and a baffle plate 4. A tube sheet 5 is fixedly connected to the right end of the heat exchanger housing 1 to facilitate positioning of the heat transfer tube bundle 3. A tube box 6 is fixedly connected to the right side of the tube sheet 5. A head 7 is fixedly connected to the left end of the heat exchanger housing 1. The partition plate 2 is fixedly connected to the middle of the inner wall of the tube box 6, and one end of it penetrates through the tube sheet 5 and extends into the interior of the heat exchanger housing 1.

[0016] As Figures 1 - 2 shown, the heat exchanger housing 1 is cylindrical. One end of the partition plate 2 is fixedly connected to the middle of the inner wall of the tube box 6, and the other end penetrates through the tube sheet 5 and extends into the interior of the heat exchanger housing 1 and is in the middle position. In this way, the interior of the heat exchanger housing 1 can be divided into upper and lower two cavities, which can extend the residence time of hot water inside the heat exchanger housing 1 and at the same time facilitate heat exchange with the heat transfer tube bundle 3.

[0017] Among them, the head 7 and the tube box 6 are installed on the heat exchanger housing 1 through bolts, which is convenient for later disassembly and replacement.

[0018] The baffle plates 4 are equidistantly arranged on the inner wall of the heat exchanger housing 1 and the surface of the partition plate 2. The heat transfer tube bundle 3 is arranged on the surface of the baffle plates 4. A docking pipe one 8 and a docking pipe two 10 are fixedly connected to the outer wall of the right end of the heat exchanger housing 1. An intake pipe 11 and an outlet pipe 12 are fixedly connected to the outer wall of the tube box 6. A cleaning assembly is arranged on the surface of the heat transfer tube bundle 3. A driving assembly is arranged inside the heat exchanger housing 1 and is used to drive the cleaning assembly to clean the heat transfer tube bundle 3.

[0019] As Figure 2 shown, through the baffle plates 4, the hot water entering the interior of the heat exchanger housing 1 can be diverted to the designated position, and at the same time, it is convenient to position the heat transfer tube bundle 3, so that the hot water exchanges heat with the natural gas inside the heat transfer tube bundle 3.

[0020] Disadvantages of the existing shell-and-tube heat exchanger during use;

[0021] The process of compressed natural gas decompression is an endothermic process. When hot water medium enters the interior of the heat exchanger housing 1 and compressed natural gas (abbreviation CNG) enters the interior of the heat transfer tube bundle, by absorbing the heat in the hot water, its temperature is increased and its pressure is reduced, so as to ensure the smooth progress of the decompression process. However, after long-term use, scale will form on its surface. When the scale accumulates to a certain amount, the heat exchange efficiency of the heat transfer tube bundle 3 will be greatly reduced, resulting in the problem that it needs to be manually disassembled and cleaned by workers;

[0022] The difference between this application and the existing heat exchanger lies in;

[0023] By arranging a cleaning component on the surface of the heat transfer tube bundle 3 and driving the cleaning component to move and clean on the surface of the heat transfer tube bundle 3 through a driving component, the heat exchange efficiency of the heat transfer tube bundle 3 can be improved, the problem of disassembling the heat exchanger shell 1 and manually cleaning the scale on its surface in the later stage can be avoided, and the practicability of the equipment can be improved at the same time.

[0024] The driving component includes a driving block 13 fixedly connected to the outer wall of the heat exchanger shell 1. The output end of the driving block 13 is fixedly connected with a gear rod 14. The bottom end of the gear rod 14 is meshed with a threaded rod 15 and is used in cooperation with the cleaning component. The cleaning component includes a connecting rod 16 arranged on the surface of the threaded rod 15 and a positioning frame 17 sleeved on the surface of the heat transfer tube bundle 3. A cleaning ring 18 is arranged at the part inside the positioning frame 17 that contacts the heat transfer tube bundle 3. A driving ring 19 is meshed at the part inside the positioning frame 17 close to the cleaning ring 18.

[0025] A rotatable turbine is arranged inside the driving ring 19. The bottom end of the connecting rod 16 is fixedly connected to the surface of the positioning frame 17. The turbine includes an auxiliary frame 22 fixedly connected inside the driving ring 19 and a cross impeller 9 arranged on the surface of the auxiliary frame 22.

[0026] As Figures 3 - 4 shown, the part of the cleaning ring 18 close to the surface of the heat transfer tube bundle 3 is provided with bristles (the material is selected as; rubber material or soft metal wire). The surface of the cleaning ring 18 close to the driving ring 19 is provided with teeth. The driving ring 19 is a hollow ring shape, and the part close to the cleaning ring 18 is also provided with meshing and is meshed and connected with each other. The side of the driving ring 19 away from the cross impeller 9 is inserted into the positioning frame 17 through a connecting shaft, which is convenient for positioning it.

[0027] The part where the connecting rod 16 contacts the surface of the threaded rod 15 is provided with threads, which is convenient for meshing connection with the threaded rod 15;

[0028] Starting the driving block 13 (using a motor as the driving source) to rotate forward can drive the gear rod 14 and the threaded rod 15 to rotate synchronously, so that the connecting rod 16 moves to the right on the surface of the threaded rod 15. When the driving block 13 rotates in reverse, the connecting rod 16 rotates left, and the positioning frame 17 is driven by the connecting rod 16 to move back and forth on the surface of the heat transfer tube bundle 3;

[0029] When the second connecting pipe 10 (hot water inlet) is connected to an external hot water pipe and water flows into the inside of the heat exchanger shell 1 and passes through the positioning frame 17, it drives the cross impeller 9 in the turbine to rotate, and synchronously drives the driving ring 19 and the cleaning ring 18 to rotate, so that the part of the cleaning ring 18 with bristles rotates on the surface of the heat transfer tube bundle 3, which is convenient for cleaning the scale on its surface and improving the heat exchange efficiency;

[0030] The position of the positioning frame 17 on the surface of the heat transfer tube bundle 3 can be adjusted through the driving block 13, which is convenient for cleaning while moving.

[0031] The data volume of the positioning frames 17 is several, and the several positioning frames 17 are fixedly connected by support rods. Brackets are fixedly connected to the surfaces at both ends of the heat exchanger housing 1. The brackets include an upper clamping ring 20 and a lower clamping ring 21 provided on the surface of the heat exchanger housing 1. The two ends of the upper clamping ring 20 and the lower clamping ring 21 are fixedly connected by bolts.

[0032] In order to maintain the stability between the positioning frames 17, they can be connected to each other through the brackets to increase the stability during movement. The heat exchanger housing 1 can be quickly fixed and supported through the upper clamping ring 20 and the lower clamping ring 21, and it is also convenient for later disassembly.

[0033] The electrical components appearing in this text are all electrically connected to an external main controller and 220V mains power, and the main controller can be a conventional known device such as a computer for control.

[0034] In the present utility model, the working steps of the device are as follows:

[0035] During use, the second connecting pipe 10 (hot water inlet) is connected to an external hot water pipeline, the first connecting pipe 8 (hot water outlet) is connected to a water storage device, the inlet gas pipe 11 (natural gas inlet) and the outlet gas pipe 12 (natural gas outlet) are connected to a pressure reducing device. At this time, the connection of the device is completed. Compressed natural gas (referred to as CNG) enters from the inlet gas pipe 11, passes through the tube box 6 and the heat transfer tube bundle 3, and is discharged from the outlet gas pipe 12. Hot water enters from the second connecting pipe 10 into the interior of the heat exchanger housing 1, is guided by the baffle plate 4 and then discharged from the first connecting pipe 8, facilitating the heat exchange of the compressed natural gas inside the heat transfer tube bundle 3;

[0036] When water flows into the interior of the heat exchanger housing 1 and passes through the positioning frames 17, the cross impeller 9 is driven to rotate by the power of the water flow, and simultaneously drives the cleaning ring 18 to clean the heat transfer tube bundle 3. When it is necessary to adjust its position, the driving block 13 is started, and the positioning frame 17 can be adjusted by driving the connecting rod 16.

[0037] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A heat exchanger for a compressed natural gas pressure reducing device, comprising a heat exchanger housing (1), a partition plate (2), a heat transfer tube bundle (3) and a baffle plate (4), characterized in that: The right end of the heat exchanger housing (1) is fixedly connected to a tube sheet (5). The right side of the tube sheet (5) is fixedly connected to a tube box (6). The left end of the heat exchanger housing (1) is fixedly connected to a head (7). The partition plate (2) is fixedly connected to the middle of the inner wall of the tube box (6), and one end of it penetrates through the tube sheet (5) and extends into the interior of the heat exchanger housing (1). The baffle plates (4) are equidistantly arranged on the inner wall of the heat exchanger housing (1) and the surface of the partition plate (2). The heat transfer tube bundle (3) is arranged on the surface of the baffle plates (4). The outer wall of the right end of the heat exchanger housing (1) is fixedly connected to a docking pipe one (8) and a docking pipe two (10). The outer wall of the tube box (6) is fixedly connected to an intake pipe (11) and an exhaust pipe (12). A cleaning assembly is arranged on the surface of the heat transfer tube bundle (3). A driving assembly is arranged inside the heat exchanger housing (1) and is used to drive the cleaning assembly to clean the heat transfer tube bundle (3).

2. The heat exchanger for a compressed natural gas decompression device according to claim 1, characterized in that: The driving assembly includes a driving block (13) fixedly connected to the outer wall of the heat exchanger housing (1). The output end of the driving block (13) is fixedly connected to a gear rod (14). The bottom end of the gear rod (14) is meshed with a threaded rod (15) and is used in cooperation with the cleaning assembly.

3. The heat exchanger for the compressed natural gas decompression device according to claim 2, characterized in that: The cleaning assembly includes a connecting rod (16) arranged on the surface of the threaded rod (15), and a positioning frame (17) sleeved on the surface of the heat transfer tube bundle (3). A cleaning ring (18) is arranged inside the positioning frame (17) at the part in contact with the heat transfer tube bundle (3).

4. The heat exchanger for a compressed natural gas decompression device according to claim 3, characterized in that: A driving ring (19) is meshed inside the positioning frame (17) at the part close to the cleaning ring (18). A rotatable turbine is arranged inside the driving ring (19). The bottom end of the connecting rod (16) is fixedly connected to the surface of the positioning frame (17).

5. The heat exchanger for a compressed natural gas pressure reducing device according to claim 4, characterized in that: The number of the positioning frames (17) is several, and several of the positioning frames (17) are fixedly connected by support rods.

6. The heat exchanger for a compressed natural gas decompression device according to claim 2, characterized in that: Supports are fixedly connected to the surfaces at both ends of the heat exchanger housing (1). The supports include an upper clamping ring (20) and a lower clamping ring (21) arranged on the surface of the heat exchanger housing (1). The two ends of the upper clamping ring (20) and the lower clamping ring (21) are fixedly connected by bolts.

7. The heat exchanger for a compressed natural gas decompression device according to claim 4, characterized in that: The turbine includes an auxiliary frame (22) fixedly connected inside the driving ring (19) and a cross impeller (9) arranged on the surface of the auxiliary frame (22).

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