Natural gas pipeline filtering device and filtering system

Abstract

The utility model belongs to the technical field of natural gas filtering equipment, and particularly relates to a natural gas pipeline filtering device and a filtering system. The natural gas pipeline filtering device comprises a barrel, a top cover arranged at the top of the barrel and a filter screen assembly movably installed in the barrel, the two sides of the barrel are connected with a gas inlet pipe and a gas outlet pipe respectively in a communicating mode, the filter screen assembly comprises a filter screen and a filter screen frame, and the filter screen frame is provided with a filter screen installation position used for containing the filter screen. A flow guide structure communicated with the air inlet pipe is arranged in the barrel, the outlet end of the flow guide structure is located below the filter screen installation position, and the inlet end of the air outlet pipe is located above the filter screen installation position. The outlet end of the flow guide structure communicated with the air inlet pipe is arranged below the filter screen mounting position used for mounting the filter screen on the filter screen frame, and the inlet end of the air outlet pipe is positioned above the filter screen mounting position, so that the filter screen is prevented from being blocked by the outlet of the air inlet pipe, the flowing path of air is prolonged, and the filter screen fully participates in impurity filtration; and the filter screen assembly is taken out to clean the filter screen.

Description

Technical Field

[0001] The utility model belongs to the technical field of natural gas filtering equipment, and in particular relates to a natural gas pipeline filtering device and a filtering system. Background Art

[0002] The distribution of terrestrial gas wells in mountain gas fields is relatively scattered, and pipeline transportation is generally used to transport natural gas to end users. However, the production of natural gas is accompanied by solid particle impurities such as silt and oil residue. Therefore, during the pipeline transportation of natural gas, it needs to go through multi-stage filtration to remove impurities in natural gas to prevent blockage of natural gas pipelines. First, after the natural gas is extracted, it enters the separator for gas-liquid separation, and at the same time separates impurities such as silt and wax; then, it is heated to increase the pipeline temperature and piped to the gas gathering station. During the pipeline transportation process, as the migration distance increases and the temperature decreases, the water vapor and liquid wax or smaller impurity particles in the pipeline gradually condense into larger wax and solid blocks and liquid water wrapped with impurities, and enter the pipeline network branch after being separated again at the gas gathering station.

[0003] After separation, the solid matter is mostly accumulated in the separator, and the pipeline resistance is reduced and the pipeline transportation volume is increased by regular sewage discharge. However, due to the irregular shape of such solid matter, it is very easy to block the sewage pipe or clog at the sewage valve of the pipeline, resulting in poor sewage discharge or even no sewage discharge, which in turn causes the liquid level in the separator to continue to rise; if it is not handled in time, natural gas and liquid mixed with the solid matter entering the separator outlet pipeline are very easy to be blocked at the reducer, causing pressure to be shut down, and the subsequent unblocking work is cumbersome and takes a long time, seriously affecting normal production; at the same time, solid matter entering the pipeline branch line will also cause pipeline transportation resistance, increasing the operation frequency of pipe cleaning. These problems will be more obvious for some terrestrial gas wells with uncertain mining time and short-term processes with poor insulation effect of pipeline laying. For this reason, filters are often set in front of the separator of the natural gas pipeline to filter impurities in the natural gas transported in the pipeline.

[0004] For example, a Chinese utility model patent with authorization announcement number CN219272513U and authorization announcement date June 30, 2023 discloses a natural gas filter, including a shell, an intake pipe, an exhaust pipe and a connecting flange. The intake pipe and the exhaust pipe are respectively connected to the two sides of the shell. A top cover is movably installed on the top of the shell by bolts, a connecting rod is welded on the lower surface of the top cover, a partition plate is connected to the bottom of the connecting rod, and a filter basket is movably connected to the lower surface of the partition plate through a sealing socket, and the partition plate is inclined at a certain angle to the horizontal plane.

[0005] However, in the above scheme, under the action of the gas transmission pressure, the natural gas entering the shell will flow directly to the outlet pipe after being blocked and diverted by the separator plate and then entering the filter basket for filtration. Only the filter basket close to the outlet pipe plays a filtering role on impurities, and the other parts of the filter basket are not fully utilized, and the filtering effect needs to be further improved; at the same time, the lowest end of the separator plate is located below the air inlet pipe, and the solid matter blocked by the separator plate will accumulate between the separator plate and the shell, and there is a risk of blocking the outlet of the air inlet pipe; when cleaning, the separator plate needs to be removed from the inner cavity of the shell through the connecting rod, and the filter basket needs to be cleaned after the separator plate and the filter basket are separated. The cleaning process is relatively cumbersome. Utility Model Content

[0006] The purpose of the utility model is to provide a natural gas pipeline filter device to solve the problem that the existing natural gas pipeline filter device needs to separate the separation plate before cleaning the filter basket, which makes the cleaning process cumbersome, and the lowest end of the separation plate is located below the intake pipe, which blocks the intake pipe outlet, and the filter basket is not fully utilized, resulting in poor filtering effect. The purpose of the utility model is also to provide a natural gas pipeline filter system to solve the same problems mentioned above.

[0007] In order to achieve the above-mentioned purpose, the natural gas pipeline filtering device in the utility model adopts the following technical solutions:

[0008] A natural gas pipeline filtering device comprises a cylinder, a top cover arranged on the top of the cylinder, and a filter assembly movably installed inside the cylinder, the two sides of the cylinder are respectively connected with an air inlet pipe and an air outlet pipe, the filter assembly comprises a filter and a filter frame, the filter frame has a filter installation position for placing the filter, a guide structure connected to the air inlet pipe is arranged in the cylinder, the outlet end of the guide structure is located below the filter installation position, and the inlet end of the outlet pipe is located above the filter installation position.

[0009] Furthermore, the filter frame is provided with a separation ring inside, and the filter installation position with a mounting opening is formed between adjacent separation rings.

[0010] Furthermore, at least two filter screen installation positions are provided and are arranged at intervals along the gas flow path.

[0011] Furthermore, the diversion structure is a diversion bend pipe section extending from the air inlet pipe to the cylinder body, and the outlet end of the diversion bend pipe section is located below the filter screen installation position of the lowest layer.

[0012] Furthermore, the mesh sizes of at least two of the filter screens gradually decrease along the gas flow path. Furthermore, the filter screen assembly is provided with an avoidance structure for the guide structure to pass through.

[0013] Furthermore, the top cover is provided with an auxiliary transfer mechanism, which includes a support fixedly arranged on the cylinder body, on which a support arm is rotatably arranged, and one end of the support arm away from the support is connected to the top cover.

[0014] The beneficial effects of the utility model are as follows: the utility model is improved based on the prior art, by configuring a filter mounting position for placing a filter on the filter frame, and at the same time configuring a guide structure that is connected to the air inlet pipe on the cylinder and making the outlet end of the guide structure located below the filter mounting position, and cooperating with the inlet end of the air outlet pipe to be located above the filter mounting position, thereby extending the gas flow path entering the cylinder, so that the filter placed at the filter mounting position can better filter impurities in the gas; through the set filter mounting position, the filter can be conveniently placed or replaced, which simplifies the operation process of cleaning the filter; by arranging the outlet end of the air inlet pipe below the filter mounting position, it is avoided that the filtered impurities block the outlet of the air inlet pipe.

[0015] In order to achieve the above purpose, the natural gas pipeline filtration system in the utility model adopts the following technical solutions:

[0016] A natural gas pipeline filtering system comprises a main pipeline and a filtering device, wherein the filtering device comprises a cylinder, a top cover arranged on the top of the cylinder, and a filter assembly movably installed inside the cylinder, the two sides of the cylinder are respectively connected with an air inlet pipe and an air outlet pipe, the filter assembly comprises a filter and a filter frame, the filter frame has a filter mounting position for placing the filter, a guide structure connected to the air inlet pipe is arranged in the cylinder, the outlet end of the guide structure is located below the filter mounting position, and the inlet end of the outlet pipe is located above the filter mounting position.

[0017] Furthermore, the filter frame is provided with a separation ring inside, and the filter installation position with a mounting opening is formed between adjacent separation rings.

[0018] Furthermore, at least two filter screen installation positions are provided and are arranged at intervals along the gas flow path.

[0019] Furthermore, the diversion structure is a diversion bend pipe section extending from the air inlet pipe to the cylinder body, and the outlet end of the diversion bend pipe section is located below the filter screen installation position of the lowest layer.

[0020] Furthermore, the mesh size of the filter screen gradually decreases along the gas flow path.

[0021] Furthermore, the filter assembly is provided with an avoidance structure for the flow guide structure to pass through.

[0022] Furthermore, the top cover is provided with an auxiliary transfer mechanism, which includes a support fixedly arranged on the cylinder body, on which a support arm is rotatably arranged, and one end of the support arm away from the support is connected to the top cover.

[0023] Furthermore, a bypass pipe communicating with the main pipe is arranged beside the filtering device.

[0024] Furthermore, pressure gauges are respectively provided on the main pipeline at the inlet side and the outlet side of the filtering device.

[0025] The beneficial effects of the utility model are as follows: the utility model is improved based on the prior art, by configuring a filter mounting position for placing a filter on the filter frame, and at the same time configuring a guide structure that is connected to the air inlet pipe on the cylinder and making the outlet end of the guide structure located below the filter mounting position, and cooperating with the inlet end of the air outlet pipe to be located above the filter mounting position, thereby extending the gas flow path entering the cylinder, so that the filter placed at the filter mounting position can better filter impurities in the gas; through the set filter mounting position, the filter can be conveniently placed or replaced, which simplifies the operation process of cleaning the filter; by arranging the outlet end of the air inlet pipe below the filter mounting position, it is avoided that the filtered impurities block the outlet of the air inlet pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of a filter device in a filter system embodiment of the utility model;

[0027] Figure 2 It is a schematic diagram of a filter frame in an embodiment of a filter system in the utility model;

[0028] Figure 3 It is a schematic diagram of a filter screen in an embodiment of a filter system in the utility model;

[0029] Figure 4 It is a schematic diagram of an embodiment of the filtering system in the present utility model.

[0030] In the figure: 100, filter device; 200, first main pipeline; 201, inlet gate valve; 202, inlet pressure gauge; 300, second main pipeline; 301, outlet gate valve; 302, outlet pressure gauge; 400, bypass pipeline; 401, bypass gate valve; 402, bypass pressure gauge; 1, cylinder; 11, air inlet pipe; 111, inlet flange; 112, guide bend section; 12, air outlet pipe; 121, outlet flange; 13, sewage pipe; 131, sewage valve; 2, filter assembly; 21, filter frame; 211, support beam; 212, separation ring; 213, reinforcement connector; 214, handle; 215, first avoidance gap; 216, frame slot; 22, filter; 221, second avoidance gap; 3, top cover; 31, filter pressure gauge; 4, support arm; 41, support. DETAILED DESCRIPTION

[0031] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0032] The utility model configures a filter mounting position for placing a filter on a filter frame, and configures a flow guide structure connected to the air inlet pipe on the cylinder body, so that the outlet end of the flow guide structure is located below the filter mounting position, and the inlet end of the air outlet pipe is located above the filter mounting position, thereby extending the gas flow path entering the cylinder body, so that the filter placed at the filter mounting position can better filter impurities in the gas; the filter mounting position is set, the filter can be conveniently placed or replaced, and the operation process of cleaning the filter is simplified; and the outlet end of the air inlet pipe is arranged below the filter mounting position, so that the filtered impurities are prevented from clogging the outlet of the air inlet pipe.

[0033] Embodiment of the natural gas pipeline filtering system in the utility model:

[0034] like Figure 4 As shown, the natural gas pipeline filtering system provided in this embodiment includes a main pipeline for transporting natural gas, a filtering device 100 connected to the main pipeline, and a bypass pipeline 400 for transporting natural gas arranged beside the main pipeline.

[0035] The main pipeline includes a first main pipeline 200 connected to the inlet flange 111 and a second main pipeline 300 connected to the outlet flange 121 . The filter device 100 is connected to the main pipeline through the inlet flange 111 and the outlet flange 121 .

[0036] like Figure 1As shown, in this embodiment, the filtering device 100 includes a cylinder 1, a top cover 3 and a filter assembly 2. Specifically, the cylinder 1 is a cylindrical pressure tank, and the outer sides of the cylinder 1 near the open end are respectively connected with an air inlet pipe 11 and an air outlet pipe 12, the end of the air inlet pipe 11 is connected with an inlet flange 111 by welding or threading, and the end of the air outlet pipe 12 is connected with an outlet flange 121 by welding or threading; the open end of the cylinder 1 is provided with a flange edge, and the top cover 3 is sealed with the flange edge by bolts; the filter assembly 2 is movably placed inside the cylinder 1.

[0037] In this embodiment, the filter assembly 2 includes a filter 22 and a filter frame 21 , and the filter frame 21 has a filter installation position for placing the filter 22 .

[0038] like Figure 2 and Figure 3 As shown, the filter frame 21 is a cylindrical frame structure, and the filter 22 is a shape adapted to the filter frame 21. In this embodiment, the filter 22 is circular; a separator ring 212 is arranged inside the filter frame 21, and a filter installation position with an installation opening is formed between adjacent separator rings 212. Specifically, the filter frame 21 includes an annular bottom frame and an annular top frame with a circular projection, and a plurality of support beams 211 connecting the bottom frame and the top frame; the bottom frame and the top frame are respectively provided with reinforcing connectors 213; a plurality of separator rings 212 are arranged between the bottom frame and the top frame along the flow path of the gas, and two adjacent separator rings 212 form a frame grid groove 216 with an installation opening between the bottom frame and the top frame, and the frame grid groove 216 forms a filter installation position for placing the filter 22. When in use, the filter 22 can be limited by placing the filter 22 from the installation opening into the frame grid groove 216. The frame slot 216 with the mounting opening can conveniently place the filter screen 22 therein, and also facilitate the cleaning and replacement of the filter screen 22;

[0039] In order to improve the filtering effect, in the present embodiment, there is an angle α between the filter installation position and the horizontal plane, and the angle α satisfies the relationship: 0°≤α<90°. Specifically, the angle between the grid groove 216 and the horizontal plane is 45°. In other embodiments, the angle between the grid groove 216 and the horizontal plane can be 0°, 15°, 30°, 60° or other suitable angles; after the filter 22 is placed in the grid groove 216, the filter 22 is in an inclined state. It should be understood that the specific selection of the angle between the grid groove 216 and the horizontal plane is reasonably selected according to actual needs, and there is no limitation on this in the present embodiment.

[0040] In the above embodiment, the inclined filter 22 can increase the contact area between the natural gas and the filter 22 when passing through, thereby increasing the filtering effect; the filter frame 21 with a frame structure can also make the impurities filtered out by the middle layer filter 22 and the highest layer filter 22 roll down along the inclined surface of the filter 22 to the inside of the cylinder 1, thereby avoiding clogging the inlet end of the outlet pipe 12; at the same time, the inclined frame groove 216 can prevent the filter 22 from slipping out of the frame groove 216 when the filter assembly 2 is taken out of the cylinder 1 or inserted into the cylinder 1 after the filter 22 is placed.

[0041] It should be noted that the setting of the support beam 211 should not affect the placement of the filter 22 in the frame slot 216. Specifically, a support beam 211 is provided on the side opposite to the installation port to limit the placement of the filter 22 in the frame slot 216; at least one support beam 211 is provided on each side of the support beam 211, so that the stability of the filter 22 after being placed in the frame slot 216 is formed by three support beams 211.

[0042] In this embodiment, there are three rack slots 216, that is, at least six separation rings 212 are provided, thereby forming three filter installation positions. Of course, in other embodiments, the rack slots 216 can be set to two, four or other suitable numbers. The specific number of rack slots 216 is reasonably selected and set according to needs, and this embodiment does not limit this.

[0043] In order to improve the filtering effect of the multi-layer filter 22, in this embodiment, the mesh size of the filter 22 gradually decreases along the gas flow path. Specifically, there are three layers of filter 22 arranged on the gas flow path, and the mesh size of each layer of filter 22 gradually decreases along the gas flow path, that is, the mesh size of the filter 22 close to the gas outlet pipe 12 is the smallest, and the mesh size of the filter 22 far away from the gas outlet pipe 12 is the largest. Natural gas enters the cylinder 1, so that the multi-layer filter 22 with different mesh sizes can be used to block and filter the solids of different specifications formed by the temperature drop and gradual condensation and wrapping during the transportation of the natural gas pipeline in turn; the filtering effect of natural gas is improved by multi-layer filtration, and such solids are effectively reduced or prevented from entering the separator, and blocked the sewage pipe or gas pipeline, thereby reducing the frequent unblocking work, and at the same time reducing the frequency of downstream pipeline branch cleaning and ball passing work.

[0044] It should be noted that in order to filter out larger solid matter that causes blockage in the downstream gas gathering station separator discharge pipe, the size of the filter mesh 22 can be reasonably selected based on factors such as the diameter of the separator discharge pipe, the duration of the inlet and outlet pressure difference increase of the filter device 100, and the frequency of cleaning, and there is no restriction on this in the present embodiment.

[0045] like Figure 1As shown, in this embodiment, a flow guiding structure communicating with the air inlet pipe 11 is arranged in the cylinder 1, the outlet end of the flow guiding structure is located below the filter screen installation position, and the inlet end of the air outlet pipe 12 is located above the filter screen installation position. The natural gas entering from the air inlet pipe 11 is guided to the bottom of the filter screen installation position by the flow guiding structure, and the inlet end of the air outlet pipe 12 is arranged above the filter screen installation position, thereby extending the flow path of the gas in the cylinder 1, so that the filter screen 22 can more fully filter the solid matter in the natural gas, and improve the filtering effect of impurities in the natural gas.

[0046] In this embodiment, the diversion structure is a diversion bend pipe section 112 extending from the air inlet pipe 11 into the cylinder 1, and the outlet end of the diversion bend pipe section 112 is located below the installation position of the lowest filter screen. Specifically, the diversion bend pipe section 112 extends into the cylinder 1 along the axial direction of the cylinder 1, and the outlet end of the diversion bend pipe section 112 is located below the lowest filter screen 22. Thus, the natural gas entering from the air inlet pipe 11 can be diverted to below the lowest filter screen 22, extending the flow path of the natural gas in the cylinder 1, so that the filter screen 22 can better filter the solid matter in the natural gas, and at the same time, the filtered solid matter can be directly dropped to the bottom of the cylinder 1, avoiding the accumulation of solid matter and blocking the outlet of the air inlet pipe 11.

[0047] like Figure 1 and 2 As shown, in order to facilitate the flow guide bend section of the air intake pipe 11 to extend into the bottom of the filter frame 21 and make the outlet end of the flow guide bend section 112 located below the lowest layer of the filter screen 22, in this embodiment, the filter screen assembly 2 is provided with an avoidance structure for the flow guide bend section 112 to pass through. Specifically, the avoidance structure is a first avoidance notch 215 provided on one side of the filter frame 21, and correspondingly, a second avoidance notch 221 adapted to the first avoidance notch 215 is provided on one side edge of the filter screen 22. By providing the avoidance notch in the filter screen assembly 2, the flow guide bend section 112 can be conveniently extended into the cylinder 1 along the first avoidance notch 215 and the second avoidance notch 221, and the outlet of the flow guide bend section 112 can be located below the lowest layer of the filter screen 22; at the same time, by cooperating with the avoidance notch and the air guide bend section 112, the filter screen assembly 2 can be positioned when placed.

[0048] As another embodiment, the filter frame 21 is no longer provided with an avoidance structure, and only an avoidance gap is provided on the filter 22 for the diversion bend section 112 to pass through.

[0049] In this embodiment, in order to facilitate the removal of the filter assembly 2 from the cylinder 1, a handle 214 is provided on the top of the filter frame 21. Specifically, the handle 214 is provided on the reinforcing connector 213 of the top frame of the filter frame 21. In other embodiments, the handle 214 may not be provided separately, but the handle 214 and the top frame reinforcing connector 213 of the filter frame 21 may be provided integrally, and the filter assembly 2 may be directly lifted out of the cylinder 1 through the reinforcing connector 213.

[0050] like Figure 1 As shown, in this embodiment, the top cover 3 is equipped with an auxiliary transfer mechanism, which includes a support 41 fixedly arranged on the cylinder 1, and a support arm 4 is rotatably arranged on the support 41, and the end of the support arm 4 away from the support 41 is connected to the top cover 3. Specifically, the support 41 is fixedly arranged on the flange edge of the cylinder 1 by welding, and the end of the support 41 away from the cylinder 1 is connected to the U-shaped support arm 4 by rotation; the rotation connection can be realized by a bearing to realize the rotation connection between the support arm 4 and the support 41, or the support arm 4 can be rotatably connected to the support 41 by other means. Of course, in other embodiments, the support can be arranged on the outer wall of the cylinder; the support arm can also be L-shaped, and the horizontal section of the support arm is connected to the top cover through a detachably connected suspension rod. Through the auxiliary transfer mechanism, the top cover 3 can be easily moved from the cylinder 1 to the side of the cylinder 1, reducing the labor intensity of the operator moving the top cover 3.

[0051] In order to facilitate instant knowledge of the pressure in the cylinder 1 , in this embodiment, a filter pressure gauge 31 is provided on the top cover 3 , so that the pressure in the cylinder 1 can be known based on the monitoring of the filter pressure gauge 31 to ensure safety when the top cover 3 is opened.

[0052] In this embodiment, in order to facilitate the discharge of impurities accumulated in the cylinder 1, the bottom of the outer wall of the cylinder 1 is connected to a drain pipe 13, and a drain valve 131 is provided on the drain pipe 13. After the drain valve 131 is opened, the impurities filtered to the bottom of the inner cavity of the cylinder 1 can be discharged through the drain pipe 13. Of course, in other embodiments, the drain pipe 13 can be provided on the bottom of the cylinder 1.

[0053] As another embodiment, the cylinder may be in a square column shape or other suitable shapes, and accordingly, the filter frame and the filter screen may also be in matching shapes.

[0054] As another embodiment, the guide structure can be a baffle that is adapted to the shape of the first notch and extends and is fixed along the axial direction of the filter frame. When the filter frame is placed in the cylinder, the channel formed by the baffle and the inner wall of the cylinder constitutes the guide structure. At this time, the air supply pipe may not be provided with a guide pipe section extending into the cylinder.

[0055] like Figures 1 to 3As shown, when in use, the filter 22 is inserted into the grid groove 216 in sequence along the gas flow path according to the mesh size, and then the filter assembly 2 is placed inside the cylinder 1, and the top cover 3 is connected to the cylinder 1 by bolts; the filter device 100 is connected to the natural gas pipeline through the inlet flange 111 and the outlet flange 121.

[0056] In this embodiment, pressure gauges are respectively provided on the inlet and outlet sides of the filter device 100 on the main pipeline. Figure 4 As shown, the first main pipeline 200 is provided with an inlet gate valve 201 for opening and closing the main pipeline and an inlet pressure gauge 202 for monitoring the pressure at the pipeline inlet end, and the second main pipeline 300 is provided with an outlet gate valve 301 for opening and closing the main pipeline and an outlet pressure gauge 302 for monitoring the pressure at the pipeline outlet end.

[0057] When in use, the filter device is installed in series at the downstream position of the main gate valve of the pipeline of the land-based natural gas intake station. When the pressure difference between the inlet pressure gauge 202 and the outlet pressure gauge 302 increases gradually, and the pressure difference increases rapidly, it indicates that the filter device 100 needs to be cleaned.

[0058] A bypass gate valve 401 for opening and closing the bypass pipeline 400 is provided on the pipe body of the bypass pipeline 400. When the filter device 100 needs to be cleaned, the inlet gate valve 201 and the outlet gate valve 301 are closed to allow natural gas to be transported through the bypass pipeline 400, thereby ensuring the normal use of natural gas and realizing online cleaning of the filter device 100.

[0059] In order to further prevent the solid matter in the natural gas during transportation through the bypass pipeline 400 from affecting the working state of the subsequent separator, a filtering device 100 may also be arranged in series in the bypass pipeline 400 .

[0060] When cleaning is required, first, fully open the bypass gate valve 401 on the bypass pipeline 400, fully close the inlet gate valve 201 on the first main pipeline 200 and the outlet gate valve 301 on the second main pipeline 300, and slowly open the drain valve 131 to discharge the liquid in the cylinder 1 after the readings of the bypass pressure gauge 402 and the outlet pressure gauge 302 are consistent; after the readings of the inlet pressure gauge 202 and the filter pressure gauge 31 return to zero, remove the bolts connecting the top cover 3 and remove the top cover 3 through the auxiliary transfer mechanism, take out the filter assembly 2 and clean the inner cavity of the cylinder 1; after replacing the filter 22, put the filter assembly 2 into the cylinder 1 again, connect the top cover 3 and the cylinder 1 and close the drain valve 131; open the inlet gate valve 201 on the first main pipeline 200 and the outlet gate valve 301 on the second main pipeline 300, and close the bypass gate valve 401 on the bypass pipeline 400; wherein, the replaced filter 22 can be kept for next use after cleaning.

[0061] By setting a filtering device 100 in the pipeline before the separator, the solid matter formed by the gradual condensation and wrapping of the incoming natural gas pipeline due to the drop in temperature can be filtered, effectively reducing or preventing such solid matter from entering the separator and clogging the sewage pipe 13 or the gas pipeline, reducing the frequent unblocking work, and cooperating with the bypass pipeline 400 to effectively ensure the normal production of the gas well.

[0062] Embodiment of the natural gas pipeline filtering device in the utility model:

[0063] The specific structure of the filter device provided in this embodiment is consistent with the structure of the filter device in the embodiment of the natural gas pipeline filter system in the utility model, and will not be described in detail here.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the description and drawings of the present invention shall be included in the protection scope of the present invention.

Claims

1. A natural gas pipeline filtering device, comprising a cylinder, a top cover arranged on the top of the cylinder, and a filter assembly movably installed inside the cylinder, wherein both sides of the cylinder are connected to an air inlet pipe and an air outlet pipe respectively, and characterized in that: The filter assembly includes a filter and a filter frame, the filter frame has a filter mounting position for placing the filter, a guide structure connected to the air inlet pipe is arranged in the cylinder, the outlet end of the guide structure is located below the filter mounting position, and the inlet end of the air outlet pipe is located above the filter mounting position.

2. The natural gas pipeline filtering device according to claim 1, characterized in that: The filter frame is provided with a separation ring inside, and the filter installation position with an installation opening is formed between adjacent separation rings.

3. The natural gas pipeline filtering device according to claim 1 or 2, characterized in that: At least two filter screen installation positions are provided and are arranged at intervals along the gas flow path.

4. The natural gas pipeline filtering device according to claim 3, characterized in that: The flow guiding structure is a flow guiding bend pipe section extending from the air inlet pipe to the cylinder body, and the outlet end of the flow guiding bend pipe section is located below the filter screen installation position of the lowest layer.

5. The natural gas pipeline filtering device according to claim 3, characterized in that: The mesh size of the filter screen gradually decreases along the gas flow path.

6. The natural gas pipeline filtering device according to claim 1 or 2, characterized in that: The filter assembly is provided with an avoidance structure for the flow guide structure to pass through.

7. The natural gas pipeline filtering device according to claim 1 or 2, characterized in that: The top cover is provided with an auxiliary transfer mechanism, which includes a support fixedly arranged on the cylinder body, a support arm rotatably arranged on the support, and an end of the support arm away from the support is connected to the top cover.

8. A natural gas pipeline filtering system, comprising a main pipeline and a filtering device, characterized in that: The filtering device is the filtering device according to any one of claims 1 to 7.

9. The natural gas pipeline filtration system according to claim 8, characterized in that: A bypass pipeline communicating with the main pipeline is arranged beside the filtering device.

10. The natural gas pipeline filtration system according to claim 8, characterized in that: The main pipeline is provided with pressure gauges at the inlet side and the outlet side of the filter device respectively.

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