Compressed natural gas recovery device for CNG storage well

Abstract

The utility model relates to the technical field of natural gas equipment, and discloses a compressed natural gas recovery device for a CNG (compressed natural gas) storage well, which comprises a gas storage well, the top of the gas storage well is fixedly connected with a gas delivery pipe, the bottom of the gas delivery pipe is fixedly connected with a gasified natural gas storage tank, and a recovery structure is arranged outside the gas delivery pipe. According to the compressed natural gas recovery device for the CNG storage well, by arranging the recovery structure, gas in the gas storage well enters the gas conveying pipe, liquefied natural gas accumulated at the connecting position of the gas conveying pipe enters the liquid accumulation pipe and flows into the liquefied natural gas storage tank through the first connecting pipe, and gas in the gas conveying pipe enters the gasified natural gas storage tank; due to the gravity influence, liquid flows into the liquefied natural gas storage tank through the second connecting pipe, residual gas in the liquefied natural gas storage tank enters the gas conveying pipe through the gas return pipe, gaseous natural gas is conveyed to designated equipment through the conveying pipe, the gas conveying pipe is prevented from being corroded, and the service life of the gas conveying pipe is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas equipment, in particular to a compressed natural gas recovery device for a CNG gas storage well. Background Art

[0002] CNG (Compressed Natural Gas) is a liquid fuel gas that is compressed from 0.1-1.0Mpa to 25Mpa by a compressor unit after desulfurization and dehydration. Its main component is methane. It is transported by special ships or tank trucks and re-gasified when used.

[0003] After searching, a utility model patent with patent number CN206582520U discloses a natural gas recovery device, and specifically discloses an LNG recovery tank, the liquid outlet end of the LNG recovery tank is connected to a low-level LPG storage tank through a drain pipe, and the drain pipe between the low-level LPG storage tank and the LNG recovery tank is also connected to a first normally open ball valve and a second normally open ball valve, and an electronic scale is placed at the bottom of the low-level LPG storage tank. By combining the graphics and text of the utility model patent, it can be seen that in the utility model patent, most of the gas transmission pipes are connected by threads, and residual liquefied natural gas will be produced during the gas transmission process. If it is not cleaned for a long time, the connection of the gas transmission pipe will be corroded, which is easy to cause gas leakage and cause losses. Therefore, a CNG gas storage well compressed natural gas recovery device is proposed to solve the above problems. Utility Model Content

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies of the prior art, the utility model provides a CNG gas storage well compressed natural gas recovery device which can prevent the gas transmission pipe from being corroded.

[0006] (II) Technical solution

[0007] According to the technical solution provided in the embodiment of the present application: a CNG gas storage well compressed natural gas recovery device comprises a gas storage well, the top of the gas storage well is fixedly connected to a gas pipeline, the bottom of the gas pipeline is fixedly connected to a gasified natural gas storage tank, the bottom of the gasified natural gas storage tank is fixedly connected to a support column, and a recovery structure is arranged outside the gas pipeline;

[0008] The recovery structure includes a liquid accumulation pipe, a connecting pipe 1, a ball valve 1, a connecting pipe 2, a ball valve 2, a liquefied natural gas storage tank, a return air pipe, a pressure gauge 1, a safety valve 1, a one-way valve, a delivery pipe, a pressure gauge 2, and a safety valve 2. The bottom of the gas delivery pipe is fixedly connected with the liquid accumulation pipe, the bottom of the liquid accumulation pipe is fixedly connected with the connecting pipe 1, the outside of the connecting pipe 1 is provided with a ball valve 1, the bottom of the gasified natural gas storage tank is fixedly connected with the connecting pipe 2, the outside of the connecting pipe 2 is provided with a ball valve 2, the left side of the connecting pipe 2 is fixedly connected with the liquefied natural gas storage tank, the top of the liquefied natural gas storage tank is fixedly connected with the return air pipe, the outside of the return air pipe is provided with a pressure gauge 1, the outside of the return air pipe is provided with a safety valve 1, the outside of the return air pipe is provided with a one-way valve, the right side of the gasified natural gas storage tank is fixedly connected with the delivery pipe, the outside of the delivery pipe is provided with a pressure gauge 2, and the outside of the delivery pipe is provided with a safety valve 2.

[0009] Furthermore, a notch matched with the liquid collection pipe is provided at the bottom of the gas transmission pipe, so as to facilitate the liquefied natural gas produced in the gas transmission pipe to enter the liquid collection pipe.

[0010] Furthermore, a connecting hole 1 adapted to the connecting tube 1 is provided at the bottom of the liquid collection tube, so as to facilitate the liquid in the liquid collection tube to enter the connecting tube 1.

[0011] Furthermore, a second connection hole matched with the second connection pipe is provided at the bottom of the gasified natural gas storage tank, so as to facilitate the liquid in the gasified natural gas storage tank to enter the second connection pipe.

[0012] Furthermore, the top of the return air pipe is fixedly connected to the bottom of the gas delivery pipe, and the bottom of the gas delivery pipe is provided with a return air hole adapted to the return air pipe, so as to facilitate the gas in the gas delivery pipe to enter the return air pipe.

[0013] Furthermore, the right side of the connecting pipe 1 is fixedly connected to the liquefied natural gas storage tank, and the left side of the liquefied natural gas storage tank is provided with a connecting hole 1 adapted to the connecting pipe 1, so as to facilitate the liquid in the connecting pipe 1 to enter the liquefied natural gas storage tank.

[0014] (III) Beneficial effects

[0015] Compared with the prior art, the utility model provides a CNG gas storage well compressed natural gas recovery device, which has the following beneficial effects:

[0016] The CNG gas storage well compressed natural gas recovery device is provided with a recovery structure. The gas in the gas storage well enters the gas pipeline. The liquefied natural gas accumulated at the connection of the gas pipeline enters the liquid accumulation pipe and flows into the liquefied natural gas storage tank through the connecting pipe 1. The gas in the gas pipeline enters the gasified natural gas storage tank. Due to the influence of gravity, the liquid flows into the liquefied natural gas storage tank through the connecting pipe 2. The residual gas in the liquefied natural gas storage tank enters the gas pipeline through the return pipe. The gaseous natural gas is transported to the designated equipment through the transmission pipe to prevent the gas pipeline from being corroded and to extend the life of the gas pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional diagram of the structure of the utility model;

[0018] Figure 2 This is a front view of the structure of the utility model;

[0019] Figure 3 This is a formal cross-sectional view of the liquefied natural gas storage tank structure of the present utility model.

[0020] In the figure: 1. gas storage well; 2. gas transmission pipeline; 3. gasified natural gas storage tank; 4. support column; 5. recovery structure; 501. liquid accumulation pipe; 502. connecting pipe 1; 503. ball valve 1; 504. connecting pipe 2; 505. ball valve 2; 506. liquefied natural gas storage tank; 507. return pipe; 508. pressure gauge 1; 509. safety valve 1; 5010. one-way valve; 5011. transmission pipe; 5012. pressure gauge 2; 5013. safety valve 2. DETAILED DESCRIPTION

[0021] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0023] A CNG gas storage well compressed natural gas recovery device, such as Figure 1 As shown, a liquid collection tube 501 is provided at the bottom of each connection of the gas transmission pipe 2. The liquid collection tube 501 is made of transparent material, and the amount of liquid can be checked. When the liquid is almost full, the ball valve 503 is opened to allow the liquid to flow into the connecting pipe 502.

[0024] like Figure 2As shown, the one-way valve 5010 prevents gas from entering the liquefied natural gas storage tank 506 through the return pipe 507, and the second pressure gauge 5012 detects the pressure in the delivery pipe 5011. When the pressure is too high, the second safety valve 5013 is closed until the pressure is balanced.

[0025] like Figure 3 As shown, a pressure gauge 508 detects the pressure in the liquefied natural gas storage tank 506. When the pressure is too high, a safety valve 509 is opened to allow the gas to enter the gas transmission pipe 2 from the return pipe 507 until the pressure is balanced. A water level sensor is provided inside the liquefied natural gas storage tank 506. When the water level reaches a certain height, a prompt will be issued, and the staff will take out the liquid in the tank.

[0026] When implementing, follow these steps:

[0027] 1) First, the gas in the gas storage well 1 enters the gas transmission pipe 2, and the liquefied natural gas accumulated at the connection of the gas transmission pipe 2 enters the liquid accumulation pipe 501, opens the ball valve 1 503, and flows into the liquefied natural gas storage tank 506 through the connecting pipe 1 502;

[0028] 2) Then the gas from the gas pipeline 2 enters the gasified natural gas storage tank 3, and the second ball valve 505 is opened to allow the liquid to flow into the liquefied natural gas storage tank 506 through the second connecting pipe 504;

[0029] 3) Finally, when the pressure gauge 508 detects that the pressure is too high, the safety valve 509 is opened to allow the remaining gas in the liquefied natural gas storage tank 506 to enter the gas transmission pipe 2 through the return pipe 507, and the gaseous natural gas is delivered to the designated equipment through the delivery pipe 5011.

[0030] To summarize, the CNG gas storage well compressed natural gas recovery device, by setting up a recovery structure 5, the gas in the gas storage well 1 enters the gas pipeline 2, the liquefied natural gas accumulated at the connection of the gas pipeline 2 enters the liquid accumulation pipe 501, and flows into the liquefied natural gas storage tank 506 through the connecting pipe 1 502, and the gas in the gas pipeline 2 enters the gasified natural gas storage tank 3. Due to the influence of gravity, the liquid flows into the liquefied natural gas storage tank 506 through the connecting pipe 2 504, and the residual gas in the liquefied natural gas storage tank 506 enters the gas pipeline 2 through the return pipe 507, and the gaseous natural gas is transported to the designated equipment through the delivery pipe 5011, which solves the problem that the gas pipelines in the utility model patent with patent number CN206582520U are mostly connected by threads, and residual liquefied natural gas will be produced during the gas transmission process. If it is not cleaned for a long time, the connection of the gas pipeline will be corroded, which is easy to cause gas leakage and cause losses.

[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A CNG gas storage well compressed natural gas recovery device, comprising a gas storage well (1), characterized in that: The top of the gas storage well (1) is fixedly connected to a gas pipeline (2), the bottom of the gas pipeline (2) is fixedly connected to a gasified natural gas storage tank (3), the bottom of the gasified natural gas storage tank (3) is fixedly connected to a support column (4), and a recovery structure (5) is provided outside the gas pipeline (2); The recovery structure (5) comprises a liquid accumulation pipe (501), a connecting pipe 1 (502), a ball valve 1 (503), a connecting pipe 2 (504), a ball valve 2 (505), a liquefied natural gas storage tank (506), a return air pipe (507), a pressure gauge 1 (508), a safety valve 1 (509), a one-way valve (5010), a delivery pipe (5011), a pressure gauge 2 (5012), and a safety valve 2 (5013). The bottom of the gas delivery pipe (2) is fixedly connected to the liquid accumulation pipe (501), the bottom of the liquid accumulation pipe (501) is fixedly connected to the connecting pipe 1 (502), the outside of the connecting pipe 1 (502) is provided with a ball valve 1 (503), the bottom of the gasified natural gas storage tank (3) is fixedly connected to the connecting pipe 2 (504), and the A second ball valve (505) is arranged outside the second connecting pipe (504), a liquefied natural gas storage tank (506) is fixedly connected to the left side of the second connecting pipe (504), a return pipe (507) is fixedly connected to the top of the liquefied natural gas storage tank (506), a pressure gauge (508) is arranged outside the return pipe (507), a safety valve (509) is arranged outside the return pipe (507), a one-way valve (5010) is arranged outside the return pipe (507), a delivery pipe (5011) is fixedly connected to the right side of the gasified natural gas storage tank (3), a second pressure gauge (5012) is arranged outside the delivery pipe (5011), and a second safety valve (5013) is arranged outside the delivery pipe (5011).

2. A CNG gas storage well compressed natural gas recovery device according to claim 1, characterized in that: The bottom of the gas delivery pipe (2) is provided with a notch adapted to fit the liquid collection pipe (501).

3. A CNG gas storage well compressed natural gas recovery device according to claim 1, characterized in that: The bottom of the liquid collection tube (501) is provided with a connection hole 1 which is compatible with the connection tube 1 (502).

4. A CNG gas storage well compressed natural gas recovery device according to claim 1, characterized in that: The bottom of the gasified natural gas storage tank (3) is provided with a second connection hole adapted to fit with a second connection pipe (504).

5. The CNG gas storage well compressed natural gas recovery device according to claim 1, characterized in that: The top of the air return pipe (507) is fixedly connected to the bottom of the air delivery pipe (2), and the bottom of the air delivery pipe (2) is provided with an air return hole that matches the air return pipe (507).

6. A CNG gas storage well compressed natural gas recovery device according to claim 1, characterized in that: The right side of the connecting pipe 1 (502) is fixedly connected to the liquefied natural gas storage tank (506), and the left side of the liquefied natural gas storage tank (506) is provided with a connecting hole 1 adapted to the connecting pipe 1 (502).

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