Natural gas long-distance pipeline buffer tank capable of removing impurities

Abstract

The utility model discloses a natural gas long -distance pipeline buffer tank of impurity can be removed belongs to natural gas transmission and distribution equipment technical field. The buffer tank includes the jar body, and the one side of jar body is connected with the buffer tank air inlet pipe, and the top of jar body is connected with the air outlet pipe, still includes the filter device, and the shell of filter device is installed with solid particle filter screen board, simultaneously, the one side of jar body is provided with the liquid discharge tank, and the top between liquid discharge tank and jar body top is connected with first connecting pipe, and the bottom between jar body and the bottom of liquid discharge tank is connected with second connecting pipe, and the one side of liquid discharge tank is connected with the liquid discharge pipe. Through solid particle filter screen board in filter device can remove solid particle impurity in natural gas, avoided solid particle impurity to the abrasion of compressor, valve and other equipment, improved the efficiency and service life of equipment operation, through liquid discharge tank can exclude the condensate oil, water and other impurities deposited in buffer tank completely.

Description

Technical Field

[0001] This utility model belongs to the technical field of natural gas transmission and distribution equipment, specifically a buffer tank for long-distance natural gas pipelines that can remove impurities. Background Technology

[0002] Natural gas buffer tanks are a common type of pressure vessel in natural gas transmission and distribution systems. Their main functions are to stabilize gas flow pressure, balance flow fluctuations, and store a certain amount of gas. They are important equipment for balancing pressure fluctuations in upstream long-distance pipelines and changes in gas load in downstream urban pipeline networks or users.

[0003] For example, Chinese utility model patent CN221300985U discloses a natural gas buffer tank, including a cylindrical body with an upper end cap at the top and a lower end cap at the bottom. A natural gas inlet is located on the side wall of the cylindrical body. The upper end cap has a natural gas outlet and a lifting lug, and the lower end cap has a support assembly. A first level gauge interface and a second level gauge interface are located on the side wall of the cylindrical body, both below the natural gas inlet. The first level gauge interface is located near the natural gas inlet, and the second level gauge interface is located near the bottom of the cylindrical body. A drain port is located on the lower end cap. Hydrocarbons, water, and other liquid impurities carried by the natural gas will partially deposit at the bottom of the cylindrical body. Level gauges are connected to the first and second level gauge interfaces to monitor the liquid level deposited inside the cylindrical body, ensuring that the liquid level does not exceed the natural gas inlet or fall too low to close the drain port, preventing natural gas leakage and ensuring the safety of the natural gas buffer tank.

[0004] The aforementioned buffer tank can conveniently remove liquid impurities such as condensate oil and water deposited at the bottom of the tank. However, the equipment still has some shortcomings during use. First, in addition to liquid impurities, natural gas from long-distance natural gas pipelines often contains solid impurities, mainly from pipeline corrosion, construction residues, and tiny mineral particles from the strata or processing. Solid particulate impurities can wear down valves, instruments, compressor cylinders, and piston rings; they can also clog pipelines, filters, instrument pressure lines, and pressure regulator valve ports, reducing equipment efficiency and shortening service life. The aforementioned equipment does not have the function of removing solid impurities. Second, although the device is designed with a level gauge interface, the bottom of the interface is still higher than the bottom of the tank, making it impossible to completely remove liquid impurities from the tank.

[0005] For the reasons mentioned above, there is an urgent need to develop a buffer tank for long-distance natural gas pipelines that can remove solid impurities from natural gas and completely discharge deposited liquid impurities. Utility Model Content

[0006] To address the shortcomings of existing technologies, this invention proposes a buffer tank for long-distance natural gas pipelines capable of removing impurities. It aims to solve the problems of existing buffer tanks for long-distance natural gas pipelines being unable to remove solid impurities and incompletely draining deposited liquid impurities.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A buffer tank for long-distance natural gas pipelines capable of removing impurities includes a tank body, an air inlet pipe connected to one side of the tank body, an air outlet pipe connected to the top of the tank body, and a filter device. A solid particle filter screen is installed inside the housing of the filter device. Both ends of the housing are connected to maintenance valves via flanges. One maintenance valve is connected to the air inlet pipe of the buffer tank, and the other maintenance valve is connected to an air inlet connection pipe. A diverter pipe is connected between the air inlet connection pipe and the air inlet pipe of the buffer tank, and a diverter valve is provided at one end of the diverter pipe connected to the air inlet connection pipe. A drain tank is provided on one side of the tank body. A first connecting pipe is connected between the top of the drain tank and the top of the tank body. A second connecting pipe is connected between the bottom of the tank body and the bottom of the drain tank. The installation height of the bottom of the drain tank is lower than the height of the bottom of the tank body. The installation height of the top of the drain tank is higher than the height of the bottom of the tank body. A drain pipe is connected to one side of the drain tank. The installation height of the drain pipe is lower than the bottom of the tank body and higher than the bottom of the drain tank. A drain valve is connected to one end of the drain pipe. A liquid level observation window is provided on the side wall of the drain tank. The lower edge of the liquid level observation window is not higher than the bottom of the tank body (1).

[0008] Preferably, the housing of the filter device is further equipped with an activated carbon adsorption plate and a zinc oxide adsorption plate, which are located upstream of the solid particle filter screen.

[0009] Preferably, the upper part of the housing of the filter device is bolted to a top cover, and the bottom of the housing is connected to a pressure relief valve.

[0010] Preferably, the solid particle filter plate, activated carbon adsorption plate, and zinc oxide adsorption plate are inserted into the housing via an insert frame, with slots on both sides of the insert frame, and slide rails corresponding to the slots are provided inside the housing.

[0011] Preferably, the solid particle filter plate includes three layers of metal filter screens installed in the insert frame, and the aperture of the three layers of metal filter screens decreases sequentially in the natural gas inlet direction.

[0012] Preferably, the activated carbon adsorption plate includes a first perforated metal plate installed on both sides of the insertion frame, and activated carbon particles are filled between the two layers of the first perforated metal plate.

[0013] Preferably, the zinc oxide adsorption plate includes a second metal perforated plate installed on both sides of the insertion frame, and zinc oxide particles are filled between the two layers of the second metal perforated plate.

[0014] Preferably, the upper and lower parts of the insert frame are provided with sealing strips, which are in contact with the inner walls of the housing and the top cover, respectively.

[0015] Beneficial effects: Compared with the prior art, the present invention can achieve at least the following technical effects; 1. This utility model provides a filter device on one side of the buffer tank pipe body. The solid particle filter screen in the filter device can remove solid particle impurities in natural gas, avoiding wear and tear on equipment such as compressors and valves caused by solid particle impurities, and improving the operating efficiency and service life of the equipment.

[0016] 2. This utility model provides a drain tank on one side of the buffer tank body. The installation height of the bottom of the drain tank is lower than the height of the bottom of the tank body, so that the condensate oil, water and other impurities deposited in the buffer tank can be completely removed.

[0017] 3. The filter device of this utility model has a modular installation structure and is equipped with a spare diversion pipeline, which facilitates the cleaning and replacement of the filter plate inside the filter device. Through the spare diversion pipeline, the filter device can be maintained without shutting off the air intake connection pipe.

[0018] 4. In some embodiments of this utility model, the filter device is also equipped with an activated carbon adsorption plate and a zinc oxide adsorption plate, which can perform preliminary adsorption and removal of gaseous impurities such as H2S and CO2 in natural gas. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the filter device of this utility model.

[0021] Figure 3 This is a schematic diagram of the solid particle filter screen of this utility model.

[0022] Figure 4 This is a schematic diagram of the activated carbon adsorption plate structure of this utility model.

[0023] Figure 5 This is a schematic diagram of the zinc oxide adsorption plate structure of this utility model.

[0024] The components are as follows: 1. Tank body; 2. Buffer tank inlet pipe; 3. Inspection valve; 4. Filter device; 401. Shell; 402. Activated carbon adsorption plate; 4021. First metal perforated plate; 4022. Activated carbon particles; 403. Zinc oxide adsorption plate; 4031. Second metal perforated plate; 4032. Zinc oxide particles; 404. Solid particle filter screen plate; 4041. Metal filter screen; 405. Top cover; 406. Insert frame; 4061. Slot; 4062. Sealing strip; 5. Diverter valve; 6. Diverter pipe; 7. Inlet connecting pipe; 8. Outlet pipe; 9. First connecting pipe; 10. Drain tank; 11. Liquid level observation window; 12. Drain pipe; 13. Drain valve; 14. Second connecting pipe; 15. Pressure relief valve. Detailed Implementation

[0025] The present invention will be further explained below with reference to specific implementation examples.

[0026] Please see Figure 1 , Figure 2 This utility model proposes a buffer tank for long-distance natural gas pipelines that can remove impurities, including a tank body 1. A buffer tank inlet pipe 2 is connected to one side of the tank body 1, and an outlet pipe 8 is connected to the top of the tank body 1. This embodiment also includes a filter device 4. A solid particle filter screen 404 is installed inside the shell 401 of the filter device 4. Both ends of the shell 401 are connected to maintenance valves 3 through flanges. One maintenance valve 3 is connected to the buffer tank inlet pipe 2, and the other maintenance valve 3 is connected to an inlet connection pipe 7. A diversion pipe 6 is connected between the inlet connection pipe 7 and the buffer tank inlet pipe 2. A diversion valve 5 is provided at one end of the diversion pipe 6 connected to the inlet connection pipe 7. The gas inlet connection pipe 7 connects to the upstream long-distance pipeline. Natural gas from the upstream pipeline enters the filter device 4 through the gas inlet connection pipe 7. The solid particle filter plate 404 in the filter device 4 filters solid impurities in the natural gas, such as pipeline corrosion, construction residues, and small mineral particles from the strata or processing. The filtered natural gas enters the tank 1 through the buffer tank inlet pipe 2. When the filter device 4 is working, the diversion valve 5 is normally closed, and the maintenance valve 3 is normally open. When the filter device 4 needs to be replaced or maintained, first open the diversion valve 5 on the diversion pipe 6, then close the maintenance valves 3 at both ends of the filter device 4. Then, while keeping the gas inlet connection pipe 7 connected to the tank 1, clean or replace the solid particle filter plate 404 of the filter device 4. After completion, open the maintenance valve 3 and close the diversion valve 5. During this period, although some unfiltered natural gas may enter the tank 1, this process is short and will not affect the quality of the natural gas.

[0027] A drain tank 10 is provided on one side of the tank body 1. A first connecting pipe 9 is connected between the top of the drain tank 10 and the top of the tank body 1. A second connecting pipe 14 is connected between the bottom of the tank body 1 and the bottom of the drain tank 10. The installation height of the bottom of the drain tank 10 is lower than the bottom height of the tank body 1, and the installation height of the top of the drain tank 10 is higher than the bottom height of the tank body 1. A drain pipe 12 is connected to one side of the drain tank 10. The installation height of the drain pipe 12 is lower than the bottom of the tank body 1 and higher than the bottom of the drain tank 10. A drain valve 13 is connected to one end of the drain pipe 12. A liquid level observation window 11 is provided on the side wall of the drain tank 10. The lower edge of the liquid level observation window 11 is not higher than the bottom of the tank body 1.

[0028] After prolonged use, heavy hydrocarbons and water vapor in the buffer tank will deposit as liquid condensate oil and liquid water at the bottom of the tank 1 under pressure. By setting up a drain tank 10, the liquid impurities deposited in the tank 1 will enter the drain tank 10 through the second connecting pipe 14. Since the top of the drain tank 10 is connected to the top of the tank 1 by the first connecting pipe 9, the pressure in the drain tank 10 and the tank 1 remains balanced, and the liquid level in the tank 1 is flush with the liquid level in the drain tank 10. By opening the drain valve 13, the liquid impurities in the tank 1 and the drain tank 10 can be discharged. Since the bottom height of the drain tank 10 is lower than the bottom height of the tank 1, and the lower edge of the liquid level observation window 11 is not higher than the bottom of the tank 1, when the liquid level shown in the liquid level observation window 11 drops to the lowest point, the liquid in the tank 1 has been completely drained, while some liquid remains at the bottom of the drain tank 10, thus ensuring that the natural gas in the tank 1 will not leak from the drain pipe 12.

[0029] like Figure 2 As shown, in this embodiment, the housing 401 of the filter device 4 is further equipped with an activated carbon adsorption plate 402 and a zinc oxide adsorption plate 403, which are located upstream of the solid particle filter screen 404.

[0030] In this embodiment, the filtration device is equipped with an activated carbon adsorption plate 402 and a zinc oxide adsorption plate 403 to address gaseous impurities in natural gas. The activated carbon adsorption plate 402 is mainly used for physical adsorption to remove VOCs from natural gas, while the zinc oxide adsorption plate 403 is mainly used for chemical adsorption to remove gaseous impurities such as acid gases and sulfides from natural gas.

[0031] In this embodiment, the upper part of the housing 401 of the filter device 4 is connected to a top cover 405 by bolts, and the bottom of the housing 401 is connected to a pressure relief valve 15. The solid particle filter plate 404, activated carbon adsorption plate 402 and zinc oxide adsorption plate 403 are inserted into the housing 401 through the insertion frame 406. The insertion frame 406 has slots 4061 on both sides, and the housing 401 has slide rails corresponding to the slots 4061.

[0032] In this embodiment, the solid particle filter plate 404, activated carbon adsorption plate 402, and zinc oxide adsorption plate 403 can be modularly installed through the insert frame 406. After opening the top cover 405, the slots 4061 on both sides of the insert frame 406 are inserted into the slide rails (rib-like protrusions that cooperate with the slots 4061) on the inner wall of the housing 401, which can complete the quick replacement of the solid particle filter plate 404, activated carbon adsorption plate 402, and zinc oxide adsorption plate 403. Since high-pressure natural gas still remains inside the housing 401 after the maintenance valve 3 is closed, for safety purposes, this embodiment is equipped with a pressure relief valve 15. Before opening the top cover 405, the pressure relief valve 15 must be opened first to discharge the high-pressure gas inside the housing 401 to avoid danger.

[0033] Please see Figure 3 In this embodiment, the solid particle filter plate 404 is further configured to include three layers of metal filter screen 4041 installed in the insert frame 406, and the aperture of the three layers of metal filter screen 4041 decreases sequentially in the natural gas inlet direction.

[0034] The solid particle filter plate 404 adopts a three-stage filtration system, with the pore size decreasing in each stage, which can fully filter solid particulate impurities of different sizes in natural gas.

[0035] Please see Figure 4 In this embodiment, the activated carbon adsorption plate 402 is further configured to include a first metal perforated plate 4021 installed on both sides of the insertion frame 406, and activated carbon particles 4022 are filled between the two layers of the first metal perforated plate 4021. After natural gas passes through the activated carbon adsorption plate 402, the activated carbon particles 4022 physically adsorb gaseous impurities such as volatile organic compounds in the natural gas. The pore size of the first metal perforated plate 4021 should be smaller than the particle size of the activated carbon particles 4022 to prevent the natural gas flow from blowing out the activated carbon particles 4022.

[0036] Please see Figure 5 In this embodiment, the zinc oxide adsorption plate 403 is further configured to include a second metal perforated plate 4031 installed on both sides of the insertion frame 406, and zinc oxide particles 4032 are filled between the two layers of the second metal perforated plate 4031.

[0037] After natural gas passes through the zinc oxide adsorption plate 403, the zinc oxide particles 4032 chemically adsorb gaseous impurities such as hydrogen sulfide in the natural gas. The pore size of the second metal perforated plate 4031 should be smaller than the particle size of the zinc oxide particles 4032 to prevent the natural gas flow from blowing out the zinc oxide particles 4032.

[0038] In this embodiment, the upper and lower parts of the insertion frame 406 are provided with sealing strips 4062, and the sealing strips 4062 are in contact with the inner walls of the housing 401 and the top cover 405, respectively.

[0039] By setting the sealing strip 4062, a seal is formed between the outer contour of the insert frame 406 and the housing 401 and the top cover 405, preventing gas from passing through the gap between the insert frame 406 and the housing 401 or the top cover 405, thus affecting the filtration effect.

[0040] In the description of this utility model, the term "multiple" refers to two or more. Unless otherwise explicitly defined, the terms "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0041] In the description of this utility model, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this utility model, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0042] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. 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 buffer tank for long-distance natural gas pipelines capable of removing impurities, comprising a tank body (1), wherein a buffer tank inlet pipe (2) is connected to one side of the tank body (1), and an outlet pipe (8) is connected to the top of the tank body (1), characterized in that, It also includes a filter device (4), in which a solid particle filter screen (404) is installed in the housing (401) of the filter device (4). Both ends of the housing (401) are connected to maintenance valves (3) via flanges. One maintenance valve (3) is connected to the air inlet pipe (2) of the buffer tank, and the other maintenance valve (3) is connected to an air inlet connection pipe (7). A diverter pipe (6) is connected between the air inlet connection pipe (7) and the air inlet pipe (2) of the buffer tank. A diverter valve (5) is provided at one end of the diverter pipe (6) connected to the air inlet connection pipe (7). A drain tank (10) is provided on one side of the tank body (1). A first connecting pipe (9) is connected between the top of the drain tank (10) and the top of the tank body (1). A second connecting pipe (14) is connected between the bottom of the tank body (1) and the bottom of the drain tank (10). The installation height of the bottom of the drain tank (10) is lower than the height of the bottom of the tank body (1). A drain pipe (12) is connected to one side of the drain tank (10). The installation height of the drain pipe (12) is lower than the bottom of the tank body (1) and higher than the bottom of the drain tank (10). A drain valve (13) is connected to one end of the drain pipe (12). A liquid level observation window (11) is provided on the side wall of the drain tank (10). The lower edge of the liquid level observation window (11) is not higher than the bottom of the tank body (1).

2. A buffer tank for long-distance natural gas pipelines capable of removing impurities according to claim 1, characterized in that, The housing (401) of the filter device (4) is also equipped with an activated carbon adsorption plate (402) and a zinc oxide adsorption plate (403), which are located upstream of the solid particle filter screen (404).

3. A buffer tank for long-distance natural gas pipelines capable of removing impurities according to claim 1, characterized in that, The upper part of the housing (401) of the filter device (4) is bolted to a top cover (405), and the bottom of the housing (401) is connected to a pressure relief valve (15).

4. A buffer tank for long-distance natural gas pipelines capable of removing impurities according to claim 2, characterized in that, The solid particle filter plate (404), activated carbon adsorption plate (402) and zinc oxide adsorption plate (403) are inserted into the housing (401) through the insertion frame (406). The insertion frame (406) has slots (4061) on both sides, and the housing (401) has slide rails corresponding to the slots (4061).

5. A buffer tank for long-distance natural gas pipelines capable of removing impurities according to claim 4, characterized in that, The solid particle filter plate (404) includes three layers of metal filter screens (4041) installed in the insert frame (406), and the aperture of the three layers of metal filter screens (4041) decreases sequentially in the natural gas inlet direction.

6. A buffer tank for long-distance natural gas pipelines capable of removing impurities according to claim 4, characterized in that, The activated carbon adsorption plate (402) includes a first metal perforated plate (4021) installed on both sides of the insert frame (406), and activated carbon particles (4022) are filled between the two layers of the first metal perforated plate (4021).

7. A buffer tank for long-distance natural gas pipelines capable of removing impurities according to claim 4, characterized in that, The zinc oxide adsorption plate (403) includes a second metal perforated plate (4031) installed on both sides of the insert frame (406), and zinc oxide particles (4032) are filled between the two layers of second metal perforated plates (4031).

8. A buffer tank for long-distance natural gas pipelines capable of removing impurities according to claim 4, characterized in that, The upper and lower parts of the insert frame (406) are provided with sealing strips (4062), which are in contact with the inner walls of the housing (401) and the top cover (405), respectively.

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