An oil separator for a gas storage tank injection compressor with a tube-type filter element.

Abstract

This invention belongs to the field of oil and gas field equipment and discloses an oil separator for a gas storage injection compressor with a pipe-type filter element. It includes a cylindrical body with a support plate inside and an oil guide pipe on the support plate. An inlet pipe is located at the initial separation chamber on the cylindrical body, and a drain pipe is located at the bottom of the cylindrical body. A filter element assembly is located above the support plate in the cylindrical body. The support plate has through holes for the gas-liquid mixture to flow into the filter element assembly. An outlet pipe is located above the filter element assembly on the cylindrical body. The filter element assembly includes a filter unit, which includes a support tube and a filter layer fixedly sleeved on the outside of the support tube. The support tube extends from the bottom to the top of the filter layer, and multiple filter holes are formed on the support tube in the area corresponding to the filter layer. The top of the filter layer and the support tube are sealed. This invention allows gas to flow out evenly from the pores of the support tube during the filtration process, thereby making full use of the filter element.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas field equipment, specifically relating to an oil separator for a gas storage injection compressor with a tube-type filter element. Background Technology

[0002] Gas storage facilities are the primary method for natural gas peak shaving due to their advantages such as strong peak-shaving capacity, low investment cost, large storage capacity, and high safety factor. During gas injection, dry gas is usually used as the gas source and transported to the gas storage area's gas gathering station via long-distance pipelines. At the gathering station, the incoming gas is separated and filtered, then pressurized by a compressor. The cooled gas is filtered again to remove the lubricating oil carried over from the compressor before being injected into the underground gas storage facility for storage.

[0003] When the gas injection compressor is working, it injects lubricating oil into the cylinder for lubrication and sealing. During the exhaust process, the lubricating oil droplets flow with the natural gas to the downstream pipeline of the compressor, then enter the gas storage tank, and penetrate into the fissures of the formation, changing the porosity of the gas storage tank and reducing the gas storage capacity of the tank, which seriously affects the production of injection and production wells. Therefore, at the outlet of the gas injection compressor, a high-efficiency oil separator is needed to separate and filter the oil-containing natural gas at the exhaust end.

[0004] The oil separator of the gas-injection compressor handles large-flow, high-pressure oil-gas mixtures. It typically has a vertical structure, consisting of upper and lower parts. The bottom is the primary separation chamber, where the oil-gas mixture first arrives and is separated into larger oil droplets with a diameter of 10 μm or more through inertial collision. The upper part of the separator contains regularly arranged filter elements. After the oil-gas mixture enters the filter elements at a slower speed, it undergoes further separation through coalescence on the fiber surface, further removing the tiny oil droplets that were not separated in the primary separation device.

[0005] The efficiency of the oil separator not only significantly impacts the utilization rate of lubricating oil and the service life of the filter element, but the purity of the gas also plays a crucial role in the stable operation of downstream pipelines and other equipment. However, existing oil separators have low oil removal efficiency, and lubricating oil still accumulates on downstream pipelines, and even enters the injection and production wells, posing a significant challenge to the safe operation of the entire gas storage facility. The main reason for this phenomenon is the unreasonable structure of the filter element in the existing gas storage facility's injection compressor oil separator. The existing filter element is cylindrical and vertically arranged. The lubricating oil adsorbed and filtered on the filter element moves downwards along the outer surface of the filter element and gradually accumulates in the lower half of the straight section of the filter element, forming an attached liquid film. When the gas passes through from the bottom, it carries small droplets, causing entrainment. Furthermore, under the operating conditions of the gas storage facility, the mainstream field of the gas-liquid mixture gathers at the bottom of the filter element, about the lower 1 / 3, leaving the upper part of the filter element idle and unable to fully perform its filtration function. Throughout the gas injection cycle, the injection pressure gradually increases, and the gas velocity entering the filter element gradually decreases. The above phenomenon will become more and more serious, further causing a decrease in filter element efficiency. Summary of the Invention

[0006] To address the problems existing in the prior art, the purpose of this invention is to provide an oil separator for an air storage tank injection compressor with a tube-type filter element. This invention can improve the utilization rate and filtration efficiency of the filter element.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] An oil separator for an air-injection compressor with a tube-type filter element in a gas storage tank includes a cylinder, an inner cavity of which is provided with a support plate, a chamber located below the support plate in the cylinder as a primary separation chamber, an oil guide pipe provided on the support plate, an inlet pipe provided on the cylinder at the primary separation chamber, and a drain pipe provided at the bottom of the cylinder.

[0009] A filter element assembly is provided in the upper part of the support plate in the cylinder. The support plate has a through hole for the gas-liquid mixture to flow into the filter element assembly. An outlet pipe is provided above the filter element assembly in the cylinder.

[0010] The filter element assembly includes a filter unit, which includes a support tube and a filter layer fixedly sleeved on the outside of the support tube. The support tube extends from the bottom of the filter layer to the top of the filter layer. Multiple filter holes are opened on the support tube in the area corresponding to the filter layer. The top of the filter layer and the support tube are closed.

[0011] Preferably, the support tube is provided with a filter element limiting support ring for limiting the lower end of the filter layer. The filter element limiting support ring includes a plurality of concentric and spaced rings, which are fixedly connected by a connecting bracket.

[0012] Preferably, the top end of the support tube is provided with a support tube positioning rod, and the top of the filter layer is provided with a filter layer positioning hole that matches the support tube positioning rod, with the support tube positioning rod extending into the filter layer positioning hole.

[0013] Preferably, the filter layer includes a filter element and a filter element cover. The filter element is sleeved on the outside of the support tube, and the filter element cover is located at the upper end of the filter element. The filter element cover has the filter layer positioning hole.

[0014] Preferably, a gap is provided between the outer wall of the support tube positioning rod and the inner wall of the filter layer.

[0015] Preferably, the size of the gap is 2mm to 3mm.

[0016] Preferably, multiple filter holes are evenly distributed in an array on the support tube.

[0017] Preferably, the filter assembly includes a plurality of filter units arranged in parallel to each other.

[0018] Preferably, the inner cavity of the cylinder is provided with a U-shaped inlet baffle on the outlet side of the inlet pipe. The bottom edge of the inlet baffle is arc-shaped, and the concave side of the bottom edge of the inlet baffle is directly opposite the outlet side of the inlet pipe. The two wings of the inlet baffle are located on the upper and lower sides of the outlet side of the inlet pipe, respectively.

[0019] Preferably, the inner cavity of the cylinder is provided with a flow straightener on the inlet side of the outlet pipe.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The oil separator in the gas injection compressor of the gas storage facility has low separation efficiency and low oil recovery rate. Even after passing through the oil separator, a large amount of lubricating oil remains in the natural gas, adhering to the pipe wall or entering the formation, severely affecting the production of injection and production wells. The specific reasons are: the flow field of oil-bearing natural gas is uneven at the filter element, the filtration load at the bottom section of the filter element is too high, and oil film accumulates at the bottom of the filter element, causing entrainment and preventing the filter element from achieving its most efficient filtration performance. This results in rapid failure, short replacement cycles, and high operating costs for the oil separator. The feature of this invention is that the short, low-bottomed support pipe in the existing structure is extended upwards to run through the entire height of the filter element, and perforations (i.e., filter holes) are made on the surface of the support pipe. Simultaneously, the filter element is installed on the outside of the support pipe using a sleeve. This improved filter element structure allows oily natural gas to be evenly discharged from the filter holes of the support tube, resulting in a more uniform load on the filter element assembly. It promotes a more even distribution of the liquid film on the filter element, preventing excessive accumulation of liquid film at the bottom of the vertical filter element and reducing the possibility of entrainment. Simultaneously, it improves the airflow characteristics of the entire filter element assembly, allowing more gas-liquid two-phase mixture to reach the upper part of the oil separator, thus enhancing the overall efficiency of the filter element assembly. Furthermore, in existing structures, due to the short support tube and only one operating port at the top, slight swaying during filter element installation makes positioning and placement very difficult. In this invention, the extended support tube allows for easy installation or replacement of the filter element with simple alignment and insertion, greatly facilitating operation. Attached Figure Description

[0022] Figure 1 This is a structural diagram of the oil separator of the gas injection compressor with insert-type filter element in the gas storage tank according to the present invention.

[0023] Figure 2 This is an internal cross-sectional view of the oil separator of the gas storage tank injection compressor with insert-type filter element according to the present invention.

[0024] Figure 3 This is a schematic diagram of the filter element assembly according to an embodiment of the present invention (wherein the middle filter element unit is a quarter longitudinal section view).

[0025] Figure 4 This is a quarter longitudinal section view of the filter element unit used in an embodiment of the present invention;

[0026] Figure 5 This is an enlarged schematic diagram (quarter longitudinal section) of the top of the filter element unit in an embodiment of the present invention.

[0027] Figure 6 This is a simulation model diagram from an embodiment of the present invention;

[0028] Figure 7 This is a model diagram of the filter element limiting support ring in an embodiment of the present invention;

[0029] Figure 8 In this embodiment of the invention, the velocity field of the internal cross section of the two model structures is shown when v = 0.5 m / s.

[0030] Figure 9 In this embodiment of the invention, the velocity field of the internal cross section of the two model structures is shown when v=3.0m / s.

[0031] In the diagram: 1-Cylinder, 1-1-Inlet pipe, 1-2-Outlet pipe, 1-3-Drain pipe, 1-4-Primary separation chamber, 2-Top cover, 3-Inlet baffle, 4-Support plate, 4-1-Filter tube through hole, 4-2-Oil guide tube through hole, 5-Oil guide tube, 6-Filter hole, 7-Support pipe, 7-1-Support pipe positioning rod, 7-2-Gap, 8-Filter layer, 8-1-Filter layer positioning hole, 8-2-Filter element top cover, 8-3-Filter element, 9-Rectifier plate, 10-Filter element limiting support ring, 10-1-Ring, 10-2-Connecting bracket, 10-3-Gap. Detailed Implementation

[0032] In the following, specific embodiments of this application will be described in detail with reference to the accompanying drawings. Based on these detailed descriptions, those skilled in the art will be able to clearly understand and implement this application. Without departing from the principles of this application, features from various embodiments can be combined to obtain new implementations, or certain features from some embodiments can be substituted to obtain other preferred implementations.

[0033] like Figures 1-4As shown, the oil separator for the gas storage compressor with a tube-type filter element in this embodiment includes a cylinder 1. A support plate 4 is provided inside the cylinder 1. The chamber located below the support plate 4 in the cylinder 1 serves as the primary separation chamber 1-4. An oil guide pipe 5 is provided on the support plate 4, which is used to guide the liquid from the upper part of the support plate 4 to the wall of the primary separation chamber 1-4 or to the outside of the cylinder 1. An inlet pipe 1-1 is provided on the cylinder 1 at the primary separation chamber 1-4, and a drain pipe 1-3 is provided at the bottom of the cylinder 1. A filter element assembly is provided on the upper part of the support plate 4. The support plate 4 has through holes for the gas-liquid mixture to flow into the filter element assembly. The cylinder 1 has an outlet pipe 1-2 above the filter element assembly. The filter element assembly includes a filter unit, which includes a support tube 7 and a filter layer 8 fixedly sleeved on the outside of the support tube 7. The support tube 7 extends from the bottom of the filter layer 8 to the top of the filter layer 8. Multiple filter holes 6 are provided on the support tube 7 in the area corresponding to the filter layer 8. The top of the filter layer 8 and the support tube 7 are closed.

[0034] When the oil separator with a tube-type filter element of the gas storage tank injection compressor described in the above embodiments of the present invention is applied in the gas storage tank injection compressor, the specific oil removal process is as follows:

[0035] The high-pressure natural gas-lubricating oil mixture at the compressor exhaust end enters the primary separation chamber 1-4 through the inlet pipe 1-1. In the primary separation chamber 1-4, a portion of the liquid in the gas-liquid mixture is captured by the wall of the cylinder 1 and then flows to the bottom of the cylinder 1. When the oil accumulates to a certain amount, it is discharged from the drain pipe 1-3 through the drain control, thereby achieving the initial separation of the gas-liquid mixture. The remaining gas-liquid mixture moves upward and then enters the filter element assembly through the through holes on the support plate 4 for gas-liquid separation.

[0036] When the gas-liquid mixture enters the support pipe 7 through the through holes on the support plate 4, it can be distributed relatively evenly along the length of the support pipe 7. The gas-liquid mixture flowing out of the filter holes 6 of the support pipe 7 flows through the filter layer 8, where gas-liquid separation is achieved by the filter element fibers of the filter layer 8. The oil that coalesces on the filter layer 8 flows downward along the surface of the filter layer 8 onto the support plate 4. After the separated oil accumulates to a certain amount, it enters the oil guide pipe 5 through the through hole 4-2 and is discharged along the oil guide pipe 5 to the outside of the cylinder 1 or the inner wall of the cylinder 1, and flows down the wall to the bottom of the cylinder 1. The purified high-pressure natural gas flowing out from the side of the filter layer 8 moves further upward and is then discharged from the outlet pipe 1-2 into the downstream pipeline.

[0037] As a preferred embodiment of the present invention, in this embodiment, such as Figure 3As shown, the support tube 7 is provided with a filter element limiting support ring 10 for limiting the lower end of the filter layer 8. The filter element limiting support ring 10 includes several concentric and spaced rings 10-1, which are fixedly connected by a connecting bracket 10-2. During assembly, the ring with the smallest diameter in the filter element limiting support ring 10 can be connected to the support tube 7 by interference fit or by welding. Since there are gaps between the rings 10-1, the filter element limiting support ring 10 in this embodiment can support the filter element while ensuring that the oil droplets filtered from the filter element can flow down through the gaps between the rings 10-1 and enter the drain pipe for discharge. Therefore, when installing or replacing the filter layer 8, only slight alignment is required, and the insert can be inserted, which brings great convenience to the operator.

[0038] As a preferred embodiment of the present invention, in this embodiment, such as Figure 4 , Figure 5 As shown, the top of the support tube 7 is provided with a support tube positioning rod 7-1, and the top of the filter layer 8 is provided with a filter layer positioning hole 8-1 that is adapted to the support tube positioning rod 7-1. The support tube positioning rod 7-1 extends into the filter layer positioning hole 8-1. By utilizing the cooperation between the support tube positioning rod 7-1 and the filter layer positioning hole 8-1, the positioning between the support tube 7 and the filter layer 8 can be achieved. Therefore, when installing or replacing the filter layer 8, it is only necessary to slightly align it and insert the sleeve, which brings great convenience to the operator.

[0039] As a preferred embodiment of the present invention, in this embodiment, such as Figure 4 , Figure 5 As shown, the filter layer 8 includes a filter element 8-3 and a filter element cover 8-2. The filter element 8-3 is sleeved on the outside of the support tube 7, and the filter element cover 8-2 is located on the upper end of the filter element 8-3. The filter element cover 8-2 is used to seal the upper end of the filter element 8-3 and the support tube 7 to prevent gas leakage. The filter layer positioning hole 8-1 is opened on the filter element cover 8-2.

[0040] As a preferred embodiment of the present invention, in this embodiment, such as Figure 5 As shown, a gap 7-2 is provided between the outer wall of the support tube positioning rod 7-1 and the inner wall of the filter layer 8. The advantage of this structural design is that the airflow flowing out of the filter holes 6 of the support tube 7 can be mixed in the gap 7-2, allowing the gas-liquid mixture to be more evenly distributed in the height direction of the filter layer 8, thereby making full use of the filter layer 8 and improving the efficiency of the filter element. Furthermore, the size of the gap 7-2 is 2mm~3mm. This gap can prevent the pressure drop of the gas-liquid mixture in the height direction of the filter layer 8 from being too fast, which is conducive to the uniform distribution of the gas-liquid mixture in the height direction of the filter layer 8.

[0041] As a preferred embodiment of the present invention, in this embodiment, such as Figures 2-5 As shown, multiple filter holes 6 are evenly distributed in an array on the support tube 7. The size of the filter holes 6 can be set according to specific circumstances, and the present invention does not impose a specific limitation.

[0042] As a preferred embodiment of the present invention, in this embodiment, such as Figure 2 and Figure 3 As shown, the filter assembly includes multiple filter units arranged in parallel to each other.

[0043] As a preferred embodiment of the present invention, in this embodiment, such as Figure 2 As shown, the inner cavity of the cylinder 1 has a U-shaped inlet baffle 3 at the outlet side of the inlet pipe 1-1. The bottom edge of the inlet baffle 3 is arc-shaped, and the concave side of the bottom edge of the inlet baffle 3 is directly opposite the outlet side of the inlet pipe 1-1. The two wings of the inlet baffle 3 are located on the upper and lower sides of the outlet side of the inlet pipe 1-1, respectively. The advantage of this structural design is that when the high-pressure natural gas-lubricating oil mixture from the compressor exhaust end enters the primary separation chamber 1-4 from the inlet pipe 1-1, the gas-liquid mixture will impact the bottom edge of the inlet baffle 3. Larger oil droplets in the mixture adhere to the inner wall of the bottom edge of the inlet baffle 3, aggregate and spread on the inner wall of the bottom edge of the inlet baffle 3 to form an oil film, and then flow down along the bottom edge of the inlet baffle 3. After converging at the wing on the lower side of the inlet baffle 3 (i.e., the wing on the lower side of the inlet pipe 1-1), they drip down from both sides of the wing and reach the bottom of the oil separator cylinder 1; and the inlet baffle 3 After the bottom edge impact, the gas-liquid mixture is forced to flow out from both sides of the inlet baffle 3 (i.e., the openings on both sides of the bottom edge of the inlet baffle 3). These two streams of air continue to move along the wall of the cylinder 1. During this process, the gas-liquid mixture collides and separates again on the wall of the cylinder 1. Subsequently, the fluid moving along the wall of the cylinder flows around the primary separation chamber 1-4. The oil-gas mixture moving in the primary separation chamber 1-4 continuously collides and contacts the wall of the cylinder 1. Therefore, the oil droplets continuously gather on the wall of the cylinder 1. After gathering to form a liquid film, it flows along the wall of the cylinder to the bottom of the cylinder 1.

[0044] As a preferred embodiment of the present invention, in this embodiment, such as Figure 2 As shown, the inner cavity of the cylinder 1 is provided with a rectifier plate 9 on the inlet side of the outlet pipe 1-2. The rectifier plate 9 can be used to rectify the purified high-pressure natural gas flowing out from the side of the filter element 8-3 into a relatively stable airflow, and then discharge it from the outlet pipe 1-2 into the downstream pipeline.

[0045] Example

[0046] This embodiment of the oil separator for the gas injection compressor of the gas storage tank with a tube-type filter element includes a cylindrical body 1 and a filter layer 8. The bottom of the cylinder 1 is a primary separation chamber 1-4, and a filter assembly is installed in the upper middle part. The lower part of the cylinder 1 has an inlet pipe 1-1 for the oil-gas mixture to enter the primary separation chamber 1-4. The upper part of the cylinder 1, above the filter assembly, has an outlet pipe 1-2 for the purified gas to flow out. The central axes of the inlet pipe 1-1 and the outlet pipe 1-2 are arranged at 90°. The bottom of the cylinder 1... The unit has a vertically downward drain pipe 1-3 in the middle; inside the oil separator, in the lower primary separation chamber 1-4, an arc-shaped concave semi-enclosed inlet baffle 3 is installed behind the inlet pipe 1-1 (i.e., on the outlet side of the inlet pipe 1-1). The inlet baffle 3 is U-shaped with an arc-shaped bottom edge, and the concave side of the bottom edge is opposite to the outlet side of the inlet pipe 1-1; a support plate 4 is installed in the middle of the cylinder 1, which supports the filter element assembly above the support plate 4, and the primary separation chamber 1-4 is below the support plate 4. The filter element assembly includes six vertically arranged filter units. Each filter unit includes a cylindrical support tube 7 and a filter layer 8 fitted onto the support tube 7, with a 2mm~3mm gap 7-2 between the filter layer 8 and the support tube 7. Filter holes 6 are evenly distributed on the surface of the support tube 7 corresponding to the filter layer 8. The support plate has six filter tube through holes 4-1 and one oil guide pipe through hole 4-2 near the side of the cylinder 1, connecting to the oil guide pipe 5. 2 is connected to the oil guide pipe 5, which leads to the outside of the cylinder. Each support pipe 7 has a corresponding filter pipe through hole 4-1 at its lower end. A support plate 10 is installed at the lower part of the support pipe 7, limiting the lower end of the filter layer 8. A support pipe positioning rod 7-1 is installed at the upper end of the support pipe 7. A support pipe positioning hole 8-1 is opened on the filter element cover 8-2 of the filter layer 8. The support pipe 7 and the filter layer 8 are fixed by the support pipe positioning rod 7-1 and the support pipe positioning hole 8-1. An oil guide pipe 5 is connected below the support plate 4. Inside the cylinder 1, a vertical rectifier plate 9 is installed before the outlet pipe 1-2 to rectify the discharged gas.

[0047] The specific implementation method of the oil separator for the gas injection compressor of the gas storage tank with a tube-type filter element at the exhaust end of the gas injection compressor of the gas storage tank in this embodiment is as follows:

[0048] The compressed natural gas-lubricating oil mixture flowing from the compressor exhaust end enters the cylinder 1 through inlet pipe 1-1;

[0049] After the gas-liquid mixture enters, it impacts the concave inlet baffle 3 in the forward direction. Larger oil droplets in the mixture adhere to the inner wall of the inlet baffle 3, aggregate and spread on the inner wall of the inlet baffle 3 to form an oil film, and then flow down along the inlet baffle 3. After gathering at the wing below the inlet baffle 3, they drip down from both sides of the wing and reach the bottom of the oil separator cylinder 1.

[0050] After the gas-liquid mixture collides with the vertical baffle (i.e. the bottom edge of the inlet baffle 3), it splits into two streams, which flow out from both sides of the bottom edge of the inlet baffle 3. After moving a certain distance along the arc-shaped inner wall (i.e. the bottom edge of the inlet baffle 3), they merge into the interior of the initial separation chamber 1-4, and then flow upward along the pressure difference.

[0051] In the primary separation chambers 1-4, the oil-gas mixture continuously collides and contacts the wall of cylinder 1. Therefore, oil droplets continuously accumulate on the wall of cylinder 1, forming a liquid film that flows down the wall to the bottom of cylinder 1. Once the lubricating oil at the bottom of the primary separation chambers 1-4 accumulates to a certain amount, it is discharged through a sludge control operation.

[0052] The gas-liquid mixture enters the support tube 7 through the openings on the support plate 4, and then flows out from the pores (i.e. filter holes 6) of each support tube and is filtered by the filter element installed outside the support tube 7. The oil droplets are filtered and aggregated by the filter cotton, forming a liquid film, and then flow down along the surface of the filter element to the support plate, and then flow to the support plate 4 below.

[0053] The oil flowing down from the filter element gathers on the support plate 4 below. After the oil accumulates to a certain amount on the support plate, it enters the oil guide pipe 5 and flows out to the outside of the cylinder 1 along the oil guide pipe.

[0054] The clean gas exiting from the side of the filter element continues to flow upward, bypasses the rectifier plate, and is discharged from the outlet pipe.

[0055] Simulation results:

[0056] like Figure 6 As shown, this invention studied and designed the original model and the improved model of this embodiment. The original model 1 and the model 2 with a porosity of 0.475 used in this invention simulated natural gas as the fluid. Under the operating conditions of the gas storage tank, the gas velocity at the inlet of the central pipe at the bottom of the filter element is between 0.5 and 3.0 m / s. Therefore, the flow field of the gas was simulated mainly for gas velocities of 0.5 m / s and 3.0 m / s, and the results were obtained. Figure 8 and Figure 9 The simulation results.

[0057] according to Figure 8In the original structural diagram (Model 1), the high-speed region of the gas phase flow field is concentrated in the lower 1 / 3 of the filter element. The gas outflow velocity decreases with increasing height, while the gas escaping from the sides of the upper and middle parts of the filter element enters the filter layer at a velocity of only about 0.18 m / s, resulting in a large difference in the internal gas flow velocity. This situation causes a large number of oil droplets to accumulate in the lower and middle parts of the filter element, leading to a decrease in efficiency. At the same time, the uneven velocity of the discharged gas leads to insufficient use of the filter element, reducing efficiency and shortening its lifespan. In the novel structure provided by this invention (Model 2), the gas-liquid mixture enters from the bottom and diffuses upwards, so that the velocity of the gas-liquid mixture flowing out from the sides is more evenly distributed around 0.3 m / s throughout the entire height range. The gap between the support tube and the filter layer allows the gas-liquid mixture to have a more uniform velocity as it flows through the filter element. Furthermore, in the original model, the pressure was mainly concentrated at the lower end of the tube during operation, with a maximum pressure difference of about 700 Pa. In contrast, the pressure in the tube of this model is more uniform, with a maximum pressure difference of about 1080 Pa. The pressure drop of the two structures is not much different, but the flow field of the new structure is significantly improved, and the pressure inside the tube is more uniform, which is conducive to the flow of gas.

[0058] Model 2 of the present invention demonstrated high efficiency in simulation. The improved model allows gas to be discharged uniformly from the filter element, thus achieving filtration. The pressure inside the tube is uniform, and the gas discharge speed varies little, which can effectively extend the service life and improve efficiency, thereby proving the feasibility of the present invention.

[0059] In summary, this invention innovates and improves the filter element structure of the oil separator in the gas storage tank's injection compressor. Its main feature is the extension of the originally short support tube into a perforated drain pipe with a positioning rod at the top and a support plate at the bottom. This allows the gas to flow evenly through the perforations of the support tube during filtration, maximizing the utilization of the filter element. Furthermore, the filter screen and filter cover are combined into a filter layer. The positioning holes between the filter layer and the support tube prevent the filter layer from rotating due to airflow, increasing stability and facilitating positioning, installation, and replacement of the filter layer. This structural improvement promotes the uniform passage of the gas-liquid mixture through the filter element, effectively improving filter element utilization and filtration efficiency. It also facilitates filter layer replacement, simplifying operation and reducing costs.

[0060] The above content provides a further detailed description of the present invention. It should not be construed that the specific embodiments of the present invention are limited to this. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all such deductions or substitutions should be considered to fall within the scope of protection of the present invention as defined by the submitted claims.

Claims

1. An oil separator for an air-injection compressor in a gas storage tank with a tube-type filter element, characterized in that, Includes a cylinder (1), the inner cavity of the cylinder (1) is provided with a support plate (4), the chamber located below the support plate (4) in the cylinder (1) serves as the initial separation chamber (1-4), the support plate (4) is provided with an oil guide pipe (5), the cylinder (1) is provided with an inlet pipe (1-1) at the initial separation chamber (1-4), and the bottom of the cylinder (1) is provided with a drain pipe (1-3). A filter element assembly is provided on the upper part of the support plate (4) in the cylinder (1). The support plate (4) has a through hole for the gas-liquid mixture to flow into the filter element assembly. An outlet pipe (1-2) is provided above the filter element assembly in the cylinder (1). The filter element assembly includes a filter unit, which includes a support tube (7) and a filter layer (8) fixedly sleeved on the outside of the support tube (7). The support tube (7) extends from the bottom of the filter layer (8) to the top of the filter layer (8). Multiple filter holes (6) are opened on the support tube (7) in the area corresponding to the filter layer (8). The top of the filter layer (8) and the support tube (7) are closed.

2. The oil separator for a gas storage tank injection compressor with a tube-type filter element according to claim 1, characterized in that, The support tube (7) is provided with a filter element limiting support ring (10) for lowering the filter layer (8). The filter element limiting support ring (10) includes several concentric and spaced rings (10-1), which are fixedly connected by a connecting bracket (10-2).

3. The oil separator for a gas storage tank injection compressor with a tube-type filter element according to claim 1, characterized in that, The top end of the support tube (7) is provided with a support tube positioning rod (7-1), and the top end of the filter layer (8) is provided with a filter layer positioning hole (8-1) that is adapted to the support tube positioning rod (7-1). The support tube positioning rod (7-1) extends into the filter layer positioning hole (8-1).

4. The oil separator for a gas storage tank injection compressor with a tube-type filter element according to claim 3, characterized in that, The filter layer (8) includes a filter element (8-3) and a filter element cover (8-2). The filter element (8-3) is sleeved on the outside of the support tube (7). The filter element cover (8-2) is located at the upper end of the filter element (8-3). The filter layer positioning hole (8-1) is opened on the filter element cover (8-2).

5. The oil separator for a gas storage tank injection compressor with a tube-type filter element according to claim 1, characterized in that, A gap (7-2) is provided between the outer wall of the support tube positioning rod (7-1) and the inner wall of the filter layer (8).

6. The oil separator for a gas storage tank injection compressor with a tube-type filter element according to claim 5, characterized in that, The size of the gap (7-2) is 2mm~3mm.

7. The oil separator for a gas storage tank injection compressor with a tube-type filter element according to claim 1, characterized in that, Multiple filter holes (6) are evenly distributed in an array on the support tube (7).

8. The oil separator for a gas storage tank injection compressor with a tube-type filter element according to claim 1, characterized in that, The filter assembly includes multiple filter units arranged in parallel to each other.

9. The oil separator for a gas storage tank injection compressor with a tube-type filter element according to claim 1, characterized in that, The inner cavity of the cylinder (1) is provided with a U-shaped inlet baffle (3) on the outlet side of the inlet pipe (1-1). The bottom edge of the inlet baffle (3) is arc-shaped. The concave side of the bottom edge of the inlet baffle (3) is directly opposite to the outlet side of the inlet pipe (1-1). The two wings of the inlet baffle (3) are located on the upper and lower sides of the outlet side of the inlet pipe (1-1) respectively.

10. The oil separator for a gas storage tank injection compressor with a tube-type filter element according to claim 1, characterized in that, The inner cavity of the cylinder (1) is provided with a flow straightener (9) on the inlet side of the outlet pipe (1-2).

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