Tubular high-pressure heat exchanger for natural gas compressor

Abstract

The utility model discloses a tubular high-pressure heat exchanger for a natural gas compressor, which comprises a support, a first heat exchanger for exchanging heat with natural gas by using air is arranged above the support, a second heat exchanger for exchanging heat with compressed natural gas by using cooling liquid is arranged above the first heat exchanger, and the first heat exchanger comprises a tube box. Tube plates are fixedly connected to the two sides of the inner side wall of the tube box, the interior of the first heat exchanger is divided into a first tube pass cavity, a second tube pass cavity and a box pass cavity through the two tube plates, a heat exchange tube bundle is arranged between the two tube plates, and a gas rotating mixing disc is arranged in the second tube pass cavity. A driving assembly for driving the gas rotating and mixing disc to rotate is arranged on the outer side wall of the tube box; through cooperation of the first heat exchanger and the second heat exchanger, the heat exchange efficiency of compressed natural gas entering the second heat exchanger is improved, and meanwhile the overall heat exchange effect of the natural gas is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of shell and tube heat exchangers, specifically a shell and tube high-pressure heat exchanger for natural gas compressors. Background Technology

[0002] In the process of natural gas extraction, transportation, and processing, compressors are indispensable key equipment used to increase the pressure of natural gas for transportation. However, the natural gas discharged from the compressor is often at a high temperature, so it is necessary to use a shell-and-tube high-pressure heat exchanger for natural gas compressors for timely and effective cooling. Otherwise, it will not only affect the normal operation of subsequent processes, but may also damage the equipment.

[0003] In existing technical solutions, natural gas discharged from the compressor is directly introduced into the heat exchanger to exchange heat with the coolant. However, the uneven distribution of natural gas entering the heat exchanger will affect the heat exchange efficiency of natural gas in the heat exchanger. Utility Model Content

[0004] To address the shortcomings of existing technologies where uneven distribution of natural gas entering the heat exchanger affects its heat exchange efficiency, this invention provides a tubular high-pressure heat exchanger for natural gas compressors.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] This utility model relates to a tubular high-pressure heat exchanger for a natural gas compressor, including a support, a first heat exchanger that uses air to exchange heat with natural gas is arranged above the support, and a second heat exchanger that uses coolant to exchange heat with compressed natural gas is arranged above the first heat exchanger.

[0007] The first heat exchanger includes a tube box, and tube sheets are fixedly connected to both sides of the inner wall of the tube box. The interior of the first heat exchanger is divided into a first tube-side cavity, a second tube-side cavity, and a box-side cavity by two tube sheets. A heat exchange tube bundle is arranged between the two tube sheets. A gas rotating mixing disk is arranged in the second tube-side cavity. A drive assembly for driving the gas rotating mixing disk to rotate is arranged on the outer wall of the tube box.

[0008] As a preferred embodiment of this utility model, the heat exchange tube bundle is provided with baffles with opposite opening directions at intervals along its outer length.

[0009] As a preferred technical solution of this utility model, the baffle plate and the tube sheet are rotatably connected to the tube box, and a first connecting rod is fixedly connected between two adjacent rotating plates. The outside of the first connecting rod is provided with bristles for cleaning the inner wall of the tube box. The driving component can drive the rotating plate near the gas rotating mixing disk to rotate.

[0010] As a preferred technical solution of this utility model, an upper tube inlet pipe and an upper tube outlet pipe are respectively provided on the lower and upper sides of one side of the outer wall of the second heat exchanger, and an upper box inlet pipe and an upper box outlet pipe are respectively provided on the upper and lower sides of the second heat exchanger.

[0011] As a preferred technical solution of this utility model, a partition plate is provided at the center of the inner sidewall of the first tube cavity, and a lower tube inlet pipe is provided below the side of the outer sidewall of the tube box near the first tube cavity, which is connected to the space below the partition plate in the first tube cavity. A lower tube outlet pipe is provided above the side of the outer sidewall of the tube box near the first tube cavity, which is connected to the space above the partition plate in the first tube cavity, and the lower tube outlet pipe is connected to the upper tube inlet pipe.

[0012] The upper side of the tube box is provided with a lower tube outlet pipe that communicates with the tube cavity, and the lower side of the tube box is provided with a lower tube inlet pipe that communicates with the tube cavity.

[0013] As a preferred embodiment of this utility model, the driving assembly includes a driving motor fixedly connected to the center of the outer wall of the tube box near the second tube cavity, a rotating rod fixedly connected to the output end of the driving motor, and the gas rotating mixing disk fixedly connected to the outer wall of the rotating rod.

[0014] As a preferred technical solution of this utility model, a second connecting rod is fixedly connected to the side of the rotating plate near the rotating rod on the side of the rotating plate close to the gas rotating mixing disk. A connecting ring is fixedly connected to the end of the second connecting rod away from the rotating plate. Inner ratchet wheels are evenly arranged on the inner sidewall of the connecting ring. A ratchet pawl that meshes with the inner ratchet wheel is fixedly connected to the side of the outer sidewall of the rotating rod close to the connecting ring.

[0015] The beneficial effects of this utility model are:

[0016] 1. This type of natural gas compressor uses a shell-and-tube high-pressure heat exchanger. Through the cooperation of the first and second heat exchangers, during operation, the compressed natural gas first enters the first heat exchanger to undergo preliminary heat exchange with the air. At the same time, the drive motor drives the rotor and the gas mixing disc to rotate, effectively mixing the natural gas passing through the first heat exchanger evenly, thereby improving the heat exchange efficiency of the compressed natural gas after entering the second heat exchanger. In addition, the natural gas undergoes a certain degree of heat exchange with the air in the first heat exchanger before entering the second heat exchanger, which can pre-cool the natural gas and improve the overall heat exchange effect of the natural gas.

[0017] 2. This type of natural gas compressor uses a shell-and-tube high-pressure heat exchanger. Through the cooperation of a rotating plate, a first connecting rod, a rotating rod, a second connecting rod, a connecting ring, an inner ratchet, and a pawl, when the device is in use, the drive motor drives the rotating rod to rotate in the direction F in the figure. At the same time, the drive motor drives the pawl to rotate, and the pawl meshes with the inner ratchet, thereby driving the inner ratchet and the connecting ring to rotate. The connecting ring drives the rotating plate near the connecting ring to rotate through the second connecting rod, and then drives all the rotating plates to rotate synchronously through the first connecting rod. During the rotation, the bristles clean the inner wall of the tube box, thereby minimizing the cleaning inside the first heat exchanger. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a three-dimensional structural diagram of the tubular high-pressure heat exchanger for a natural gas compressor according to this utility model;

[0020] Figure 2 This is a side view of the first heat exchanger structure of the tubular high-pressure heat exchanger for a natural gas compressor according to this utility model.

[0021] Figure 3 This is a three-dimensional cross-sectional view of the first heat exchanger of the tubular high-pressure heat exchanger for natural gas compressors of this utility model.

[0022] Figure 4 This is a side sectional view of the tubular high-pressure heat exchanger for a natural gas compressor according to this utility model.

[0023] Figure 5 This is a schematic diagram of the baffle structure of the tubular high-pressure heat exchanger for a natural gas compressor according to this utility model;

[0024] Figure 6 This is a schematic diagram of the gas rotating mixing disk structure of the tubular high-pressure heat exchanger for a natural gas compressor according to this utility model;

[0025] Figure 7 This is a schematic diagram of the ratchet structure of the tubular high-pressure heat exchanger for a natural gas compressor according to this utility model.

[0026] In the diagram: 1. Support; 2. First heat exchanger; 201. Tube box; 202. Tube sheet; 203. First tube-side cavity; 204. Second tube-side cavity; 205. Box-side cavity; 206. Heat exchange tube bundle; 207. Gas rotating mixing disk; 208. Baffle plate; 209. Rotating plate; 210. First connecting rod; 211. Pass-dividing partition; 212. Lower tube-side inlet pipe; 213. Lower tube-side outlet pipe; 214. Lower box-side outlet pipe; 215. Lower box-side inlet pipe; 3. Second heat exchanger; 301. Upper tube-side inlet pipe; 302. Upper tube-side outlet pipe; 303. Upper box-side inlet pipe; 304. Upper box-side outlet pipe; 401. Drive motor; 402. Rotating rod; 403. Second connecting rod; 404. Connecting ring; 405. Inner ratchet; 406. Pawl. Detailed Implementation

[0027] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0028] Reference Figure 1 and Figure 2 The present invention relates to a tubular high-pressure heat exchanger for a natural gas compressor, comprising a support 1, a first heat exchanger 2 for exchanging heat between air and natural gas is disposed above the support 1, a second heat exchanger 3 for exchanging heat between coolant and compressed natural gas is disposed above the first heat exchanger 2, an upper tube inlet pipe 301 and an upper tube outlet pipe 302 are respectively disposed below and above one side of the outer wall of the second heat exchanger 3, and an upper box inlet pipe 303 and an upper box outlet pipe 304 are respectively disposed on the upper and lower sides of the second heat exchanger 3;

[0029] Reference Figure 3 and Figure 4The first heat exchanger 2 includes a tube box 201. Tube sheets 202 are fixedly connected to both sides of the inner wall of the tube box 201. The interior of the first heat exchanger 2 is divided into a first tube-side chamber 203, a second tube-side chamber 204, and a box-side chamber 205 by two tube sheets 202. A heat exchange tube bundle 206 is arranged between the two tube sheets 202. The first tube-side chamber 203 and the second tube-side chamber 204 are connected by the heat exchange tube bundle 206. A partition plate 211 is arranged at the center of the inner wall of the first tube-side chamber 203. A lower tube-side inlet pipe 212 is arranged on the lower side of the outer wall of the tube box 201 near the first tube-side chamber 203, communicating with the space below the partition plate 211 within the first tube-side chamber 203. The lower tube-side inlet pipe 212 is fixedly connected to the output end of the compressor via a flange. Natural gas compressed by the compressor first passes through the lower tube-side inlet pipe 212. The compressed natural gas enters the space below the partition plate 211 in the first tube cavity 203, and then flows into the second tube cavity 204 through the heat exchange tube bundle 206. It then flows into the space above the partition plate 211 in the first tube cavity 203 through the heat exchange tube bundle 206. During this process, the compressed natural gas can exchange heat with the air in the box cavity 205 through the tube wall of the heat exchange tube bundle 206. The outer wall of the tube box 201 is provided with a lower tube outlet pipe 213 that is connected to the space above the partition plate 211 in the first tube cavity 203. The lower tube outlet pipe 213 is connected to the upper tube inlet pipe 301. A connecting pipe is connected between the lower tube outlet pipe 213 and the upper tube inlet pipe 301 through a flange. The lower tube outlet pipe 213 and the upper tube inlet pipe 301 are connected through the connecting pipe.

[0030] Reference Figure 3 and Figure 4 A lower chamber outlet pipe 214 connected to the chamber cavity 205 is provided on one side above the pipe box 201, and a lower chamber inlet pipe 215 connected to the chamber cavity 205 is provided on one side below the pipe box 201. Gas used for heat exchange with compressed natural gas in the first heat exchanger 2 enters the interior of the pipe box 201 through the lower chamber inlet pipe 215, and flows out from the lower chamber outlet pipe 214 after heat exchange with compressed natural gas.

[0031] Reference Figure 3 , Figure 4 and Figure 5 The heat exchange tube bundle 206 is provided with baffles 208 with opposite opening directions at intervals along its outer length. With the baffles 208, the gas used for heat exchange with compressed natural gas enters the box cavity 205 and moves from the side of the box cavity 205 near the lower box inlet pipe 215 to the side of the lower box outlet pipe 214. During this process, due to the baffles 208, the overall air flow direction changes continuously and is in a zigzag shape, thereby maximizing the residence time of the air in the box cavity 205 and improving the heat exchange effect between the air and the compressed natural gas.

[0032] Reference Figure 3 , Figure 4 and Figure 6 A gas rotating mixing disk 207 is provided in the second tube cavity 204. The gas rotating mixing disk 207 is a disk with uniformly distributed through holes on its surface. A drive assembly for driving the gas rotating mixing disk 207 to rotate is provided on the outer wall of the tube box 201. The drive assembly includes a drive motor 401 fixedly connected to the center of the outer wall of the tube box 201 near the second tube cavity 204. The drive motor 401 is electrically connected to a control panel (not shown in the figure). The output end of the drive motor 401 is fixedly connected to a rotating rod 402, and the gas rotating mixing disk 207 is fixedly connected to the outer wall of the rotating rod 402. After the compressed natural gas passes through the heat exchange tube bundle 206 and undergoes preliminary heat exchange with the air and flows into the second tube cavity 204, the drive motor 401 drives the rotating rod 402 and the gas rotating mixing disk 207 to rotate. Then, when the gas passes through the holes in the gas rotating mixing disk 207, the shear force and turbulence effect generated during the rotation of the gas rotating mixing disk, as well as the dispersion effect of the holes on the gas, are used to promote the uniform mixing of the compressed natural gas.

[0033] Reference Figure 3 , Figure 4 and Figure 7 A rotating plate 209 is rotatably connected to both the baffle 208 and the tube sheet 202 and the tube box 201. A first connecting rod 210 is fixedly connected between two adjacent rotating plates 209. The outside of the first connecting rod 210 is provided with bristles for cleaning the inner wall of the tube box 201. The drive assembly can drive the rotating plate 209 near the gas rotating mixing disk 207 to rotate. A second connecting rod 403 is fixedly connected to the side of the rotating plate 209 near the rotating rod 402. A connecting ring 404 is fixedly connected to the end of the second connecting rod 403 away from the rotating plate 209. Inner ratchet 405 is evenly arranged on the inner wall of the connecting ring 404. Inner ratchet 405 is fixedly connected to the outer wall of the rotating rod 402 near the connecting ring 404. The 5-phase meshing pawl 406, when the drive motor 401 drives the rotating rod 402 to rotate in the direction E in the figure, the rotating rod 402 can only drive the gas rotating mixing disk 207 to rotate, thereby mixing the natural gas entering the second tube cavity 204. When the drive motor 401 drives the rotating rod 402 to rotate in the direction F in the figure, the drive motor 401 drives the pawl 406 to rotate at the same time, the pawl 406 meshes with the inner ratchet 405, thereby driving the inner ratchet 405 and the connecting ring 404 to rotate. The connecting ring 404 drives the rotating plate 209 close to the connecting ring 404 to rotate through the second connecting rod 403, and then drives all the rotating plates 209 to rotate synchronously through the first connecting rod 210. During the rotation, the bristles brush and clean the inner wall of the tube box 201.

[0034] The working principle of this utility model is as follows: When in use, the gas used to exchange heat with compressed natural gas in the first heat exchanger 2 enters the tube box 201 through the lower tube inlet pipe 215, and flows out from the lower tube outlet pipe 214 after exchanging heat with compressed natural gas.

[0035] After being compressed by the compressor, the natural gas first enters the space below the partition plate 211 in the first tube cavity 203 through the lower tube inlet pipe 212. Then, it flows into the second tube cavity 204 through the heat exchange tube bundle 206. At the same time, the compressed natural gas undergoes preliminary heat exchange with the air in the box cavity 205 through the tube wall of the heat exchange tube bundle 206. After the compressed natural gas undergoes preliminary heat exchange with the air through the heat exchange tube bundle 206 and flows into the second tube cavity 204, the drive motor 401 drives the rotating rod 402 and the gas rotating mixing disk 207 to rotate in the direction E in the figure. Then, when the gas passes through the holes in the gas rotating mixing disk 207, the shear force and turbulence effect generated during the rotation of the gas rotating mixing disk 207, as well as the dispersion effect of the holes on the gas, are used to promote the uniform mixing of the compressed natural gas.

[0036] After being mixed evenly, the natural gas flows through the heat exchange tube bundle 206 and into the space above the partition plate 211 in the first tube side cavity 203. During this process, the mixed natural gas exchanges heat with the air in the box side cavity 205 again. Then, the natural gas enters the tube side section of the second heat exchanger 3 through the lower tube side outlet pipe 213 and the upper tube side inlet pipe 301. At the same time, the coolant enters the box side section of the second heat exchanger 3 through the upper box side inlet pipe 303 and exchanges heat with the natural gas in the tube side. After the heat exchange is completed, the coolant flows out of the second heat exchanger 3 through the upper box side outlet pipe 304, and the cooled natural gas is discharged through the upper tube side outlet pipe 302.

[0037] When the device is finished, the drive motor 401 drives the rotating rod 402 to rotate in the direction F in the figure. At the same time, the drive motor 401 drives the pawl 406 to rotate, and the pawl 406 meshes with the inner ratchet 405, thereby driving the inner ratchet 405 and the connecting ring 404 to rotate. The connecting ring 404 drives the rotating plate 209 close to the connecting ring 404 to rotate through the second connecting rod 403, and then drives all the rotating plates 209 to rotate synchronously through the first connecting rod 210. During the rotation, the bristles brush and clean the inner wall of the tube box 201.

[0038] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A shell-and-tube high-pressure heat exchanger for a natural gas compressor, comprising a support (1), characterized in that, A first heat exchanger (2) using air and natural gas for heat exchange is provided above the support (1), and a second heat exchanger (3) using coolant and compressed natural gas for heat exchange is provided above the first heat exchanger (2). The first heat exchanger (2) includes a tube box (201), and tube sheets (202) are fixedly connected to both sides of the inner wall of the tube box (201). The interior of the first heat exchanger (2) is divided into a first tube side cavity (203), a second tube side cavity (204) and a box side cavity (205) by two tube sheets (202). A heat exchange tube bundle (206) is arranged between the two tube sheets (202). A gas rotating mixing disk (207) is arranged in the second tube side cavity (204). A drive assembly for driving the gas rotating mixing disk (207) to rotate is arranged on the outer wall of the tube box (201).

2. The tubular high-pressure heat exchanger for a natural gas compressor according to claim 1, characterized in that, The heat exchange tube bundle (206) is provided with baffles (208) with opposite opening directions at intervals along its outer length.

3. The tubular high-pressure heat exchanger for a natural gas compressor according to claim 2, characterized in that, The baffle (208) and tube sheet (202) are rotatably connected to the tube box (201) by a rotating plate (209). A first connecting rod (210) is fixedly connected between two adjacent rotating plates (209). The outside of the first connecting rod (210) is provided with bristles for cleaning the inner wall of the tube box (201). The driving assembly can drive the rotating plate (209) near the gas rotating mixing disk (207) to rotate.

4. The shell-and-tube high-pressure heat exchanger for a natural gas compressor according to claim 1, characterized in that, The second heat exchanger (3) has an upper tube side inlet pipe (301) and an upper tube side outlet pipe (302) respectively located on the lower and upper sides of one side of the outer wall. The second heat exchanger (3) also has an upper box side inlet pipe (303) and an upper box side outlet pipe (304) respectively located on the upper and lower sides.

5. The shell-and-tube high-pressure heat exchanger for a natural gas compressor according to claim 1, characterized in that, A partition plate (211) is provided at the center of the inner wall of the first tube cavity (203). A lower tube inlet pipe (212) is provided on the lower side of the outer wall of the tube box (201) near the first tube cavity (203) and communicates with the space below the partition plate (211) in the first tube cavity (203). A lower tube outlet pipe (213) is provided on the upper side of the outer wall of the tube box (201) near the first tube cavity (203) and communicates with the space above the partition plate (211) in the first tube cavity (203). The lower tube outlet pipe (213) is connected to the upper tube inlet pipe (301). A lower air outlet pipe (214) connected to the box cavity (205) is provided on one side above the pipe box (201), and a lower air inlet pipe (215) connected to the box cavity (205) is provided on one side below the pipe box (201).

6. The shell-and-tube high-pressure heat exchanger for a natural gas compressor according to claim 3, characterized in that, The drive assembly includes a drive motor (401) fixedly connected to the center of the outer wall of the tube box (201) near the second tube cavity (204), the output end of the drive motor (401) is fixedly connected to a rotating rod (402), and the gas rotating mixing disk (207) is fixedly connected to the outer wall of the rotating rod (402).

7. The tubular high-pressure heat exchanger for a natural gas compressor according to claim 6, characterized in that, A second connecting rod (403) is fixedly connected to the side of the rotating plate (209) near the rotating rod (402) near the side of the rotating plate (207). A connecting ring (404) is fixedly connected to the end of the second connecting rod (403) away from the rotating plate (209). Inner ratchet (405) is evenly arranged on the inner sidewall of the connecting ring (404). A pawl (406) that meshes with the inner ratchet (405) is fixedly connected to the side of the outer sidewall of the rotating rod (402) near the connecting ring (404).

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