Oil-gas mixture filtering and degassing device

Abstract

The present invention discloses a device for filtering and degassing an oil-gas mixture, comprising a filter degasser, the filter degasser comprising a tank body, a liquid inlet pipe provided on one side of the tank body, a liquid outlet pipe provided on the other side of the tank body, a filter cartridge assembly having an inlet connected to the liquid inlet pipe, a defoaming device installed at the gas outlet at the top of the tank body, the defoaming device comprising an outer barrel installed at the gas outlet, a float linkage device installed at the top of the outer barrel, the bottom end of the outer barrel extending into the tank body, a lower defoaming plate provided at the bottom end of the outer barrel, and an upper defoaming plate provided on the inner side of the outer barrel. The device for filtering and degassing an oil-gas mixture reduces foam at the oil-gas interface, avoids the appearance of excessive foam at the oil-gas interface during the rising liquid level, effectively reduces the amount of liquid contained in the exhaust gas of the filter degasser gas line during the rising liquid level, improves the gas-liquid separation effect, and avoids the problem of liquid contained in the gas line of the filter degasser.

Description

Technical Field

[0001] The invention relates to the field of oil-gas separation, and in particular to an oil-gas mixture filtering and degassing device. Background Art

[0002] In the measurement and transportation processes of crude oil and petroleum products, filter eliminators have long been used to purify solid foreign matter and eliminate gases from liquid media. This reduces erosion of the pipe walls by solid foreign matter and gases, and ensures the proper functioning and accurate measurement of the metering equipment behind the filter eliminator. Therefore, filter eliminators play an important role in the measurement and transportation of crude oil and petroleum products.

[0003] Currently, most filter-degassers use a tank expansion and filter system to achieve gas-liquid separation and filtration. When the gas-liquid two-phase fluid enters the filter-degasser, the increased volume within the tank reduces the fluid's pressure upon entry. The volume of gas originally dissolved and contaminated in the liquid increases, causing it to separate from the liquid and rise to the upper surface, forming an oil-gas interface. The airless or low-gas liquid below the oil-gas interface passes through the filter and exits the filter-degasser through the outlet. As the gas-containing fluid gradually flows in, more gas is separated from the oil-gas interface, increasing the gas pressure. This degassing effect decreases, forcing the liquid interface in the tank downward. At this point, the float in the tank descends along with the liquid level, pulling the exhaust valve downward. The valve at the top of the degasser opens, releasing gas from the top, reducing the tank pressure and raising the liquid level, restoring the filter-degasser's gas separation capabilities.

[0004] However, in actual use, when the filter eliminator is used in applications involving thick oil or other highly viscous liquid media, the gas separated from the liquid forms a large number of difficult-to-break bubbles at the oil-gas interface. As the liquid level drops, the bubbles, due to their high viscosity, remain attached to the vent hole and the inner wall. When the float opens the exhaust valve downward, the bubbles are discharged from the filter eliminator along with the gas, causing liquid to remain at the filter eliminator's gas outlet. This not only affects the gas-liquid separation effect but also clogs the gas pipeline with crude oil, increasing on-site maintenance work. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides an oil-gas mixture filtering and degassing device, which solves the problems in the background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a device for filtering and degassing an oil-gas mixture, including a filter eliminator, the filter eliminator including a tank body, a liquid inlet pipe is provided on one side of the tank body, and a liquid outlet pipe is provided on the other side of the tank body, a filter cartridge assembly whose inlet is connected to the liquid inlet pipe is provided in the tank body, and a defoaming device is installed at the gas outlet at the top of the tank body.

[0007] The defoaming device includes an outer barrel installed at the gas outlet, a float linkage device is installed on the top of the outer barrel, the bottom end of the outer barrel extends into the tank body, and a lower defoaming plate is provided at the bottom end of the outer barrel and an upper defoaming plate is provided on the inner side of the outer barrel.

[0008] It is further defined that the upper defoaming plate is a perfect circular punching plate with a diameter equal to the inner diameter of the outer barrel.

[0009] It is further defined that the lower defoaming plate is a punched plate rolled into a conical surface with an opening facing downward, and its generatrix is ​​at thirty degrees to the horizontal plane.

[0010] It is further defined that the filter degasser also includes a filter barrel fixing device arranged inside the tank body at the liquid inlet pipe, and the filter barrel assembly is installed on the filter barrel fixing device.

[0011] It is further defined that the filter barrel assembly includes a filter barrel body rolled from a punching plate, a top plate is fixed to the top of the filter barrel body, a filter screen is provided on the inner wall of the filter barrel body, the bottom end of the filter barrel body is connected to the bottom circle of the filter barrel by bolts, the bottom circle of the filter barrel is made of a punching plate and is provided with a circular groove for embedding and fixing the filter barrel body and the filter screen, the top of the filter screen extends to the top plate and is fixed by a filter screen pressing plate through bolts, and a handle is welded on the filter screen pressing plate.

[0012] It is further defined that the filter barrel fixing device, filter screen pressure plate and top plate are all made of elliptical annular steel plates inclined at forty-five degrees, the filter barrel body is located inside the filter barrel fixing device and the bottom surface of the top plate is in contact with the upper surface of the filter barrel fixing device.

[0013] It is further defined that the float linkage device includes an exhaust valve body installed on the top of the outer barrel, the valve core of the exhaust valve body is hinged to the top of the float through a float connecting rod, and a float fixing rod is fixed to the bottom end of the exhaust valve body, and the other end of the float fixing rod is hinged to the top of the float.

[0014] The present invention has the following beneficial effects: the oil-gas mixture filtering and degassing device reduces the foam at the oil-gas interface, avoids the appearance of a large amount of foam at the oil-gas interface during the rising process of the liquid level, effectively reduces the exhaust gas containing liquid in the gas pipeline of the filter eliminator during the rising process of the liquid level, improves the gas-liquid separation effect, and avoids the problem of liquid in the gas pipeline of the filter eliminator. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the float linkage device of the present invention;

[0017] Figure 3 Schematic diagram of the defoaming device of the present invention.

[0018] In the figure: 1. Float linkage device; 11. Float; 12. Float connecting rod; 13. Float fixing rod; 14. Valve core; 15. Exhaust valve body; 2. Filter eliminator; 21. Liquid inlet pipe; 22. Liquid outlet pipe; 23. Tank body; 24. Filter barrel fixing device; 3. Defoaming device; 31. Lower defoaming plate; 32. Outer barrel; 33. Upper defoaming plate; 4. Filter barrel assembly; 41. Filter barrel body; 42. Filter screen; 43. Filter barrel bottom circle; 44 Filter screen pressure plate; 45. Handle. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] See also Figure 1-3 The present invention provides a technical solution: a filtering and degassing device for an oil-gas mixture, comprising a filtering and degassing device 2, the filtering and degassing device 2 comprising a tank body 23, the tank body 23 being a supporting component of the entire device, a liquid inlet pipe 21 being provided on one side of the tank body 23, a liquid outlet pipe 22 being provided on the other side of the tank body 23, one end of the liquid inlet pipe 21 and the outlet pipe 22 being connected to the tank body and the other end being provided with a flange, a filter cartridge assembly 4 having an inlet connected to the liquid inlet pipe 21 being provided in the tank body 23, and a defoaming device 3 being installed at the gas outlet at the top end of the tank body 23.

[0021] See Figure 3 The defoaming device 3 includes an outer barrel 32 installed at the gas outlet, a float linkage device 1 is installed on the top of the outer barrel 32, the bottom end of the outer barrel 32 extends into the tank body 23, and a lower defoaming plate 31 is provided at the bottom end of the outer barrel 32, and an upper defoaming plate 33 is provided on the inner side of the outer barrel 32. The upper defoaming plate 33 adopts a perfect circular punching plate with a diameter equal to the inner diameter of the outer barrel 32, and the lower defoaming plate 31 adopts a punching plate rolled into a cone and opening downward, and its generatrix is ​​thirty degrees to the horizontal plane.

[0022] See Figure 1The filter degasser 2 also includes a filter barrel fixing device 24 arranged on the inner side of the tank body 23 at the liquid inlet pipe 21. The filter barrel assembly 4 includes a filter barrel body 41 rolled by a punching plate. A top plate is fixed to the top of the filter barrel body 41. A filter screen 42 is provided on the inner wall of the filter barrel body 41. The bottom end of the filter barrel body 41 is connected to the filter barrel bottom circle 43 by bolts. The filter barrel bottom circle 43 adopts a punching plate and is provided with a circular groove for embedding and fixing the filter barrel body 41 and the filter screen 42. The top of the net 42 extends to the top plate and is fixed by the filter screen pressing plate 44 with bolts. A handle 45 is welded on the filter screen pressing plate 44 to facilitate the disassembly of the filter barrel assembly 4. The filter barrel fixing device 24, the filter screen pressing plate 44 and the top plate are all made of elliptical annular steel plates inclined at forty-five degrees. The filter barrel body 41 is located on the inner side of the filter barrel fixing device 24 and the bottom surface of the top plate is in contact with the upper surface of the filter barrel fixing device 24. The filter barrel fixing device 24 is used to provide circumferential and axial positioning for the filter barrel assembly 4.

[0023] See Figure 2 The float linkage device 1 includes an exhaust valve body 15 installed on the top of the outer barrel 32. The valve core 14 of the exhaust valve body 15 is hinged to the top of the float 11 through the float connecting rod 12. A float fixing rod 13 is fixed to the bottom end of the exhaust valve body 15. The other end of the float fixing rod 13 is hinged to the top of the float 11. Under liquid-free conditions, the float 11 is in contact with the upper defoaming plate 33.

[0024] When the filter degasser 2 is working, the three-phase mixture of solid, liquid and gas enters the tank body 23 through the liquid inlet pipe 21, and enters the interior of the filter barrel cylinder 41 through the 45-degree opening of the filter barrel assembly 4. Due to the large space of the tank body 23, the internal pressure of the tank body 23 is lower than that of the inlet pipe 21, so that the liquid level in the tank body 23 can be higher than the inlet pipe 21. At the same time, due to the reduction in the pressure in the tank body 23, the volume of the gas originally dissolved and mixed in the fluid increases, and is separated from the liquid phase and rises to the liquid surface to form bubbles; in the process of the bubbles rising with the liquid level, the bubbles first contact the lower defoaming plate 31, and in the process of contact with the lower defoaming plate 31, the bubbles are subjected to the tangential friction force of the lower defoaming plate 31 and burst;

[0025] As the liquid level continues to rise and reaches the upper defoamer plate 33, the foam breaks due to frictional contact with the upper defoamer plate 33. After two defoaming cycles, the foam at the oil-gas interface is reduced, preventing excessive foam from forming at the oil-gas interface during the rising liquid level. This effectively reduces the amount of liquid contained in the gas pipeline during the filter-eliminator 2's exhaust. When the liquid level exceeds the float 11, the buoyancy of the float 11 drives the float connecting rod 12, lifting the valve core 14 and closing the exhaust valve. As more gas separates from the liquid, a large amount of gas accumulates at the top of the filter-eliminator 2, causing the pressure to rise and forcing the liquid level to drop. The float 11 follows the drop in the liquid level and pulls the valve core 14 downward, exhausting the filter-eliminator 2 and repeating the above process. The liquid entering the filter-eliminator 2 is filtered through the filter screen 42 of the filter barrel assembly 4, leaving solid impurities trapped within the screen 42. The liquid and a small amount of gas then exit the filter-eliminator 2 through the liquid outlet pipe 22.

[0026] During the operation of the filter eliminator 2, the liquid level in the tank body 23 rises and falls continuously, and the foam at the oil-gas interface contacts the lower defoaming plate 31 and the upper defoaming plate 33 of the defoaming device 3 multiple times. The friction force of the defoaming plate removes the foam at the oil-gas interface, thereby improving the overall oil-gas separation effect of the device and avoiding the presence of liquid in the gas pipeline of the filter eliminator 2.

[0027] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0028] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for filtering and degassing an oil-gas mixture, comprising a filter eliminator (2), the filter eliminator (2) comprising a tank body (23), a liquid inlet pipe (21) being provided on one side of the tank body (23), and a liquid outlet pipe (22) being provided on the other side of the tank body (23), characterized in that: The tank body (23) is provided with a filter barrel assembly (4) whose inlet is connected to the liquid inlet pipe (21), and a defoaming device (3) is installed at the gas outlet at the top of the tank body (23); The defoaming device (3) comprises an outer barrel (32) installed at the gas outlet, a float linkage device (1) is installed at the top of the outer barrel (32), the bottom end of the outer barrel (32) extends into the tank body (23), and a lower defoaming plate (31) is provided at the bottom end of the outer barrel (32), and an upper defoaming plate (33) is provided on the inner side of the outer barrel (32); The filter eliminator (2) further comprises a filter barrel fixing device (24) arranged on the inner side of the tank body (23) at the liquid inlet pipe (21), and the filter barrel assembly (4) is mounted on the filter barrel fixing device (24); The filter barrel assembly (4) comprises a filter barrel body (41) rolled from a punching plate, a top plate fixed to the top of the filter barrel body (41), a filter screen (42) provided on the inner wall of the filter barrel body (41), a filter barrel bottom circle (43) made of a punching plate and provided with a circular groove for embedding and fixing the filter barrel body (41) and the filter screen (42), and the top of the filter screen (42) extends to the top plate and is fixed by a filter screen pressing plate (44) through bolts; The upper defoaming plate (33) is a circular perforated plate having a diameter equal to the inner diameter of the outer barrel (32); The lower defoaming plate (31) is a punched plate rolled into a conical surface with an opening downward, and its generatrix is ​​at a 30-degree angle to the horizontal plane; The filter barrel fixing device (24), the filter screen pressing plate (44) and the top plate are all made of elliptical annular steel plates inclined at 45 degrees; When the filter degasser (2) is in operation, a three-phase mixed fluid of solid, liquid and gas enters the tank body (23) through the liquid inlet pipe (21) and enters the interior of the filter barrel body (41) through the 45-degree opening of the filter barrel assembly (4).

2. The oil-gas mixture filtering and degassing device according to claim 1, characterized in that: The bottom end of the filter barrel body (41) is connected to the filter barrel bottom circle (43) through bolts, and a handle (45) is welded on the filter screen pressing plate (44).

3. The oil-gas mixture filtering and degassing device according to claim 2, characterized in that: The filter barrel body (41) is located inside the filter barrel fixing device (24), and the bottom surface of the top plate is in contact with the upper surface of the filter barrel fixing device (24).

4. The oil-gas mixture filtering and degassing device according to any one of claims 1 to 3, characterized in that: The float linkage device (1) comprises an exhaust valve body (15) mounted on the top of an outer barrel (32); a valve core (14) of the exhaust valve body (15) is hinged to the top of a float (11) via a float connecting rod (12); a float fixing rod (13) is fixed to the bottom end of the exhaust valve body (15); and the other end of the float fixing rod (13) is hinged to the top of the float (11).

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