Filtering structure of oil gas recovery oil storage tank

Abstract

The utility model discloses a filtering structure of an oil-gas recovery oil storage tank, and aims to solve the problems of low filtering efficiency, easiness in blockage and difficulty in maintenance in the traditional oil-gas recovery. The structure comprises an oil storage tank, a filtering device, an air inlet pipe and an air outlet pipe. The filtering device is sequentially provided with a coarse filtering layer, a coalescence layer, an activated carbon layer and an oil gas fine filtering device in the oil gas transmission direction. The coarse filtering layer adopts a metal net filter element and is provided with a self-cleaning mechanism, the coalescence layer is made of an oleophylic and hydrophobic material, and the activated carbon layer is of a porous honeycomb structure. The oil-gas fine filtering device comprises a cyclone separator and an electrostatic capturing device. A box body is arranged in the electrostatic capturing device, a positive plate and a negative pole form an oil gas channel, the negative pole ionizes particles, and the positive plate captures the particles. The positive plate is fixed through a spring structure, and the beating device drives the beating hammer to vibrate for cleaning. The efficiency is improved through combination of multi-stage filtration and electrostatic dust collection, and the maintenance cost is reduced through a self-cleaning mechanism.

Description

Technical Field

[0001] This utility model relates to a filtration structure for an oil and gas recovery storage tank, belonging to the field of oil and gas recovery technology. Background Technology

[0002] In the petrochemical industry, oil storage tanks generate significant amounts of volatile oil and gas during storage and transportation. This not only wastes resources but also pollutes the environment. Therefore, oil and gas recovery technology has been widely applied. Traditional oil and gas recovery devices typically treat oil and gas through filtration and adsorption, but these methods suffer from low filtration efficiency and difficult equipment maintenance. Furthermore, with increased usage time, impurities accumulate in the filter, leading to blockages and impacting oil and gas recovery efficiency.

[0003] Existing oil and gas filtration structures mostly employ a single filter layer or a simple multi-layer filtration design. While these can separate impurities from oil and gas to some extent, their effectiveness in capturing fine particles or liquid oil droplets is limited. Furthermore, after long-term operation, the performance of filtration devices is easily degraded due to the accumulation of oil and particulate matter, and the lack of an effective self-cleaning mechanism leads to increased maintenance costs. Therefore, a highly efficient and easy-to-maintain oil and gas recovery filtration structure is needed. Utility Model Content

[0004] The purpose of this invention is to provide a filtration structure for an oil and gas recovery storage tank, which can effectively solve the above-mentioned problems.

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

[0006] It includes an oil storage tank, a filter device, and an air inlet pipe and an air outlet pipe installed on the filter device. The filter device includes a coarse filter layer, a coalescing layer, an activated carbon layer, and an oil-gas fine filter device arranged sequentially along the oil-gas transmission direction.

[0007] The oil and gas fine filtration device includes a cyclone separator and an electrostatic capture device connected to the top output end of the cyclone separator.

[0008] Furthermore: the electrostatic capture device includes a housing, in which multiple positive plates are evenly spaced, forming an oil-gas channel between the positive plates, and a negative electrode post is disposed in the oil-gas channel.

[0009] Furthermore: the upper and lower ends of the positive electrode plate are both fixed to the housing by a spring structure. The spring structure includes a fixing plate, and multiple springs are evenly arranged on the end face of the fixing plate. One end of each spring is connected to a mounting plate, and the positive electrode plate is fixed to the mounting plate. The housing is also equipped with a tapping device to control the vibration of the mounting plate.

[0010] Furthermore: the striking device includes a rotating shaft disposed inside the housing, one end of which is driven by an electric motor; a mounting ring is disposed on the rotating shaft, a mounting arm is disposed on the mounting ring, a connecting plate is rotatably connected to the front and rear ends of the mounting arm, and a striking hammer is rotatably connected between the connecting plates, the striking hammer being cylindrical in shape and having a rubber layer covering its outer surface.

[0011] Furthermore: the coarse filter layer, the coalescing layer, and the activated carbon layer are arranged sequentially in the primary filter box according to the oil and gas transmission direction;

[0012] The coarse filter layer is made of metal mesh or wire mesh filter element, and a self-cleaning mechanism is provided on the end face of the coarse filter layer; the coalescing layer is made of oleophilic and hydrophobic material; the activated carbon layer adopts a porous honeycomb structure; the self-cleaning mechanism adopts either a rotating scraper or a pulse airflow device.

[0013] The beneficial effects are:

[0014] 1. Through a multi-stage filtration structure consisting of a coarse filter layer, a coalescing layer, an activated carbon layer, and an oil and gas fine filter, it can effectively remove large particulate impurities, liquid oil droplets, and volatile organic compounds from oil and gas, thereby improving the purity of oil and gas recovery.

[0015] 2. The cyclone separator and electrostatic capture device in the oil and gas fine filtration device are used in combination. The cyclone separation removes larger particles, while the electrostatic effect captures fine particles and oil mist, further improving the filtration accuracy.

[0016] 3. The positive plate in the electrostatic capture device vibrates through a spring structure and a striking device, which can effectively remove oil and particles attached to the positive plate and extend the service life of the device. Attached Figure Description

[0017] For ease of explanation, this utility model is described in detail below with reference to the specific embodiments and accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a structural diagram of the internal structure of the primary filter box of this utility model;

[0020] Figure 3 This is a structural diagram of the cyclone separator of this utility model;

[0021] Figure 4 This is a partial cross-sectional view of the electrostatic capture device of this utility model;

[0022] Figure 5 This is a schematic diagram of the internal structure of the electrostatic capture device of this utility model;

[0023] Figure 6 for Figure 5 Enlarged view of a portion of the image;

[0024] Figure 7 This is an internal cross-sectional view of the electrostatic capture device of this utility model.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Oil storage tank; 2. Air inlet pipe; 3. Air outlet pipe; 4. Filtration device; 5. Coarse filter layer; 6. Coalescing layer; 7. Activated carbon layer; 8. Oil-gas fine filtration device; 9. Cyclone separator; 10. Electrostatic capture device; 101. Housing; 102. Positive electrode plate; 103. Negative electrode post; 11. Spring structure; 111. Fixing plate; 112. Spring; 113. Mounting plate; 12. Striking device; 121. Rotating shaft; 122. Mounting ring; 123. Mounting arm; 124. Connecting plate; 125. Striking hammer; 13. Primary filter box. Detailed Implementation

[0027] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0028] It should be noted that, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are 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, and therefore should not be construed as a limitation of this utility model.

[0029] Furthermore, the terms “first,” “second,” “third,” etc., are used for descriptive purposes only and should not be interpreted as indicating or implying relative importance.

[0030] Furthermore, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] See Figure 1-7 This is one embodiment of the filtration structure of an oil and gas recovery storage tank according to the present invention.

[0032] like Figure 1 The filtration structure of the oil and gas recovery storage tank in this embodiment includes an oil storage tank 1, a filtration device 4, and an inlet pipe 2 and an outlet pipe 3 installed on the filtration device 4. The oil storage tank 1 is used to store the recovered oil and gas. The oil and gas that needs to be filtered enters the filtration device 4 through the inlet pipe 2, and is discharged from the outlet pipe 3 after being processed.

[0033] Preliminary filtration by filter device 4:

[0034] like Figure 2 , Figure 3 The filtration device 4 is sequentially arranged with a coarse filter layer 5, a coalescing layer 6, and an activated carbon layer 7 along the oil and gas transmission direction. Specifically, the coarse filter layer 5, the coalescing layer 6, and the activated carbon layer 7 are installed in the primary filter box 13 and arranged sequentially according to the oil and gas flow direction. The coarse filter layer 5 uses a metal mesh filter element to initially filter large particulate impurities in the oil and gas. Its end face is equipped with a self-cleaning mechanism, which in this embodiment uses a rotating scraper. The rotating scraper is driven by a motor to periodically scrape off the deposits on the surface of the coarse filter layer 5. The coalescing layer 6 is made of an oleophilic and hydrophobic material, which can effectively coalesce liquid oil droplets in the oil and gas, causing them to separate and settle. The activated carbon layer 7 adopts a porous honeycomb structure with a large specific surface area, and is used to adsorb volatile organic compounds in the oil and gas.

[0035] Fine filtration by filter device 4:

[0036] The oil and gas fine filtration device 8 is located downstream of the primary filter box 13 and includes a cyclone separator 9 and an electrostatic capture device 10 connected to the top output end of the cyclone separator 9. The cyclone separator 9 uses the principle of centrifugal force to separate larger particles in the oil and gas to the bottom, and the gas output from the top enters the electrostatic capture device 10 for further processing.

[0037] like Figure 4-7The electrostatic capture device 10 includes a housing 101, within which multiple positive electrode plates 102 are evenly spaced, forming oil-gas channels. A negative electrode post 103 is positioned within these channels. When energized, the positive electrode plates 102 and the negative electrode post 103 create an electrostatic field, capturing fine particles and oil mist from the oil-gas mixture. Specifically, the negative electrode post 103 functions as a charge emitter and particle charge generator in the electrostatic capture device 10. Connected to the negative terminal of a high-voltage power supply, the negative electrode post 103 is designed as a slender cylindrical structure and positioned within the oil-gas channels between the positive electrode plates 102. When high voltage is applied, corona discharge occurs around the negative electrode post 103, releasing a large number of electrons and ionizing nearby gas molecules to form negative ions. These negative ions collide with fine particles and oil mist particles in the oil-gas mixture, causing them to acquire a negative charge. This process lays the foundation for subsequent particle capture by the positive electrode plate 102. The positive electrode 102 is connected to the positive terminal of the high-voltage power supply, providing a stable positive charge distribution and ensuring a uniform and efficient electric field in the oil and gas channel. Negatively charged particles, driven by the electric field, move towards the positive electrode 102 and adhere to its surface, thus being captured.

[0038] The structure for removing adhering particles from the positive electrode plate 102 in the electrostatic capture device 10:

[0039] The upper and lower ends of the positive electrode plate 102 are fixed to the housing 101 by a spring structure 11. The spring structure 11 includes a fixing plate 111, on which multiple springs 112 are evenly arranged. One end of each spring 112 is connected to a mounting plate 113, and the positive electrode plate 102 is fixed to the mounting plate 113. The elastic design of the springs 112 allows the positive electrode plate 102 to vibrate slightly when subjected to external force. To remove oil and particles adhering to the positive electrode plate 102, a striking device 12 is also provided inside the housing 101. The striking device 12 includes a rotating shaft 121, one end of which is driven by a motor. A mounting ring 122 is fixed on the rotating shaft 121, and a mounting arm 123 is connected to the mounting ring 122. The front and rear ends of the mounting arm 123 are connected to a rotating connecting plate 124, and a striking hammer 125 is rotatably connected between the connecting plates 124. The hammer 125 has a cylindrical structure and its outer surface is covered with a rubber layer to reduce noise during impact and wear on the mounting plate 113. When the rotating shaft 121 rotates, the hammer 125 periodically strikes the mounting plate 113 along with the mounting arm 123, causing the positive electrode plate 102 to vibrate and thus shake off the attached material.

[0040] Meanwhile, due to the structural design of the striking device 12, when the striking hammer 125 follows the rotating shaft 121 from the rising process to the falling process, it releases its own weight. Under the combination of the centripetal force of the rotating shaft 121 and the gravity, the striking hammer 125 will tilt and strike the mounting plate 113, causing the mounting plate 113 to vibrate. This method can save energy by relying on the weight of the striking hammer 125 itself.

[0041] The working process of this embodiment is as follows: The oil and gas generated in the oil storage tank 1 enters the filtration device 4 through the air inlet pipe 2. First, the oil and gas passes through the coarse filter layer 5, where the metal mesh filter element filters out larger particulate impurities. The rotating scraper periodically cleans the deposits on the surface of the coarse filter layer 5 to ensure unobstructed flow. Next, the oil and gas enters the coalescing layer 6, where the oleophilic and hydrophobic materials coalesce the liquid oil droplets, causing them to settle and separate. Subsequently, the oil and gas passes through the activated carbon layer 7, where the porous honeycomb structure adsorbs volatile organic compounds, further purifying the gas. Afterward, the oil and gas enters the oil and gas fine filtration device 8, where the cyclone separator 9 separates larger particles through centrifugal force. The remaining gas enters the electrostatic capture device 10. The positive electrode plate 102 captures fine particles and oil mist. The rotating shaft 121 in the tapping device 12 drives the tapping hammer 125 to periodically tap the mounting plate 113, causing the positive electrode plate 102 to vibrate and remove the adhering substances. Finally, the treated clean gas is discharged from the air outlet pipe 3.

[0042] This embodiment achieves efficient separation and recovery of oil and gas through multi-stage treatment consisting of a coarse filter layer 5, a coalescing layer 6, an activated carbon layer 7, and an oil-gas fine filtration device 8. Simultaneously, the self-cleaning mechanism of the coarse filter layer 5 and the tapping device 12 of the electrostatic capture device 10 effectively reduce impurity accumulation, extend the service life of the filter structure, and reduce maintenance frequency.

[0043] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A filtration structure for an oil and gas recovery storage tank, comprising an oil storage tank (1), a filtration device (4), and an inlet pipe (2) and an outlet pipe (3) disposed on the filtration device (4), characterized in that: The filtration device (4) includes a coarse filter layer (5), a coalescing layer (6), an activated carbon layer (7), and an oil and gas fine filter device (8) arranged sequentially along the oil and gas transmission direction; wherein, the oil and gas fine filter device (8) includes a cyclone separator (9) and an electrostatic capture device (10) connected to the top output end of the cyclone separator (9).

2. The filtering structure of an oil and gas recovery storage tank according to claim 1, characterized in that: The electrostatic capture device (10) includes a housing (101), in which a plurality of positive plates (102) are evenly spaced, forming an oil and gas channel between the positive plates (102), and a negative electrode post (103) is provided in the oil and gas channel.

3. The filtering structure of the oil and gas recovery storage tank according to claim 2, characterized in that: The positive electrode plate (102) is fixed to the housing (101) at both ends by a spring structure (11). The spring structure (11) includes a fixing plate (111). Multiple springs (112) are evenly arranged on the end face of the fixing plate (111). One end of the spring (112) is connected to a mounting plate (113). The positive electrode plate (102) is fixed on the mounting plate (113). A tapping device (12) for controlling the vibration of the mounting plate (113) is also provided inside the housing (101).

4. The filtering structure of the oil and gas recovery storage tank according to claim 3, characterized in that: The striking device (12) includes a rotating shaft (121) disposed in the housing (101), one end of which is driven by an electric motor; a mounting ring (122) is disposed on the rotating shaft (121), a mounting arm (123) is disposed on the mounting ring (122), a connecting plate (124) is rotatably connected to the front and rear ends of the mounting arm (123), and a striking hammer (125) is rotatably connected between the connecting plates (124). The striking hammer (125) is cylindrical in shape, and the outer surface of the striking hammer (125) is covered with a rubber layer.

5. The filtration structure of an oil and gas recovery storage tank according to claim 1, characterized by: The coarse filter layer (5), the coalescing layer (6), and the activated carbon layer (7) are arranged sequentially in the primary filter box (13) according to the oil and gas transmission direction; the coarse filter layer (5) adopts a metal mesh or wire mesh filter element, and a self-cleaning mechanism is provided on the end face of the coarse filter layer (5); the coalescing layer (6) is made of oleophilic and hydrophobic material; the activated carbon layer (7) adopts a porous honeycomb structure; the self-cleaning mechanism adopts either a rotating scraper or a pulse airflow device.

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