Wharf oil gas recovery treatment method

Abstract

The invention discloses a wharf oil gas recovery treatment method which comprises the steps that mixed gas is fed into a shell from a first inlet, a separation device is arranged in the shell, a first cavity is formed between the separation device and the shell, oil gas and a water mixture in the mixed gas are separated under the action of the separation device, and first-stage separation is completed; the mixed gas subjected to primary separation enters a second cavity of the first filtering device, the first filtering device is located in the first filtering device, a fourth cavity is defined by the first filtering device and the separating device, and the mixed gas filtered by the first filtering device enters the fourth cavity from the second cavity; and the mixed gas entering the fourth chamber is conveyed to the first gas outlet pipe from the first outlet. According to the treatment method, gas and liquid in the oil-gas mixture can be effectively separated, and solid particles can be efficiently filtered. The processing method is suitable for an oil and gas transmission system between a ship and a shore-based facility so as to ensure the safety and stability of oil and gas transmission.

Description

Technical Field

[0001] The present application belongs to the technical field of oil and gas recovery and treatment, and in particular relates to a method for oil and gas recovery and treatment at a wharf. Background Art

[0002] In the oil and gas recovery and processing facilities at the wharf, gas-liquid separation is a crucial link, especially when oil and gas are transmitted between ships and shore. Due to the gas and liquid mixture that may be generated during the transmission process, if it is not effectively separated, it will not only affect the transmission efficiency, but also may cause damage to the equipment and even cause safety accidents. Therefore, it is particularly important to design an efficient, safe and easy-to-maintain gas-liquid separator. Traditional gas-liquid separators often have problems such as low filtration efficiency, difficult maintenance, and insufficient automation in design. Especially when dealing with oil and gas mixtures containing solid particles, they are prone to clogging, affecting the separation effect and the long-term stable operation of the equipment. Summary of the invention

[0003] Purpose of the invention: This application provides a method for recovering and treating oil and gas at a wharf. The treatment method of this application can effectively separate the gas and liquid in the oil and gas mixture, and can also efficiently filter solid particles. The treatment method of this application is applicable to the oil and gas transmission system between ships and shore-based facilities to ensure the safety and stability of oil and gas transmission.

[0004] Technical solution: The embodiment of the present application provides a method for recovering oil and gas at a wharf, comprising:

[0005] The mixed gas is fed into the shell from the first inlet. A separation device is provided inside the shell. A first chamber is provided between the separation device and the shell. The mixed gas is separated from the oil-gas and water mixture in the mixed gas by the separation device, thus completing the first-level separation.

[0006] The mixed gas after the primary separation enters the second chamber of the first filter device, the first filter device is located inside the first filter device, the first filter device and the separation device form a fourth chamber, and the mixed gas after being filtered by the first filter device enters the fourth chamber from the second chamber;

[0007] The mixed gas entering the fourth chamber is sent to the first gas outlet pipe from the first outlet.

[0008] In some embodiments, the mixed gas is further processed by a second filtering device before being sent to the first filtering device.

[0009] In some embodiments, the separation device includes a first cylinder, which is coaxially arranged with the shell, and the outer wall of the first cylinder is provided with spiral blades. The mixed gas spirals up from bottom to top along the spiral blades, and the oil gas and water vapor in the mixed gas are separated under the action of inertia, centrifugal force and gravity.

[0010] In some embodiments, the first cylinder has a first end and a second end, and the pitch of the spiral blade gradually increases along the direction from the first end to the second end.

[0011] In some embodiments, the spiral blade rotates counterclockwise, and a bottom end starting point of the spiral blade is located at the left center of the first outlet.

[0012] In some embodiments, a first air inlet pipe is provided on the shell, and the first air inlet pipe extends along the tangential direction of the shell cylinder wall; the mixed gas enters the first chamber along the inner wall of the second cylinder in the tangential direction, and rotates upward to enter the interior of the shell.

[0013] In some embodiments, the separation device further includes an inner sealing plate, the inner sealing plate is located at the lower end of the first cylinder, and a plurality of first through holes are provided on the inner sealing plate.

[0014] In some embodiments, the separation device further includes a first support plate and a second support plate; the first support plate and the second support plate are respectively located at the upper and lower ends of the first cylinder, and are used to fix the first cylinder to the inside of the shell.

[0015] In some embodiments, the first support plate and the second support plate are in an arc-shaped structure.

[0016] In some embodiments, the first filter device includes a filter element fixing plate, a first filter element body fixed to the filter element fixing plate, and a filter element lower sealing plate arranged below the first filter element body. The first filter element body and the filter element fixing plate form an upper opening air inlet, and the gas entering the first filter element body enters the fourth chamber from the side wall of the first filter element body.

[0017] In some embodiments, the first filter element body is a multi-layer stainless steel fiber.

[0018] In some embodiments, an air inlet pressure measuring port is provided on the first air inlet pipe, and an air outlet pressure measuring port is provided on the first air outlet pipe. Differential pressure transmitters are installed on the air inlet pressure measuring port and the air outlet pressure measuring port to monitor the differential pressure at the air inlet and air outlet ends of the gas-liquid separator.

[0019] In some embodiments, the second filter device is located above the first filter device, and the second filter device includes a first head and a first filter layer, the first head and the first filter layer form a third chamber, the third chamber is connected to the first chamber, and the third chamber is connected to the second chamber.

[0020] In some embodiments, the first filter layer is a corrosion-resistant stainless steel multi-layer wire mesh.

[0021] In some embodiments, the second filtering device further comprises an air supply port, a safety valve port and a pressure detection port; the air supply port is provided with an air supply valve, the safety valve port is provided with a safety valve, and the pressure detection port is provided with a pressure transmitter for monitoring the pressure in the gas-liquid separator:

[0022] When the pressure is lower than the low pressure threshold, the air supply valve on the air supply port is opened;

[0023] When the pressure is higher than a first high pressure threshold, reducing or closing the air intake of the first inlet;

[0024] When the pressure is higher than the second high pressure threshold, an alarm will be sounded and the safety valve will open to prevent the equipment from overpressure or leakage.

[0025] Beneficial effects: The present application provides a method for recovering and treating oil and gas at a wharf, the method comprising: a mixed gas is sent into the interior of a shell from a first inlet, a separation device is arranged inside the shell, a first chamber is provided between the separation device and the shell, and the oil and gas mixed gas is separated from the oil and gas and water mixture in the mixed gas under the action of the separation device, completing a first-level separation; the mixed gas after the first-level separation enters the second chamber of the first filter device, the first filter device is located inside the first filter device, the first filter device and the separation device form a fourth chamber, and the mixed gas filtered by the first filter device enters the fourth chamber from the second chamber; the mixed gas entering the fourth chamber is sent from the first outlet to the first outlet pipe. The treatment method of the present application can effectively separate the gas and liquid in the oil and gas mixture, and can also efficiently filter solid particulate matter. The treatment method of the present application is applicable to the oil and gas transmission system between ships and shore-based facilities to ensure the safety and stability of oil and gas transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of a gas-liquid separation device for a ship-shore safety interface for oil and gas recovery at a dock in an embodiment of the present application;

[0027] Figure 2 This is a schematic diagram of the structure of a gas-liquid separation device for a ship-shore safety interface for oil and gas recovery at a dock in an embodiment of the present application;

[0028] Figure 3 This is a partial structural schematic diagram of a separation device in an embodiment of the present application;

[0029] Figure 4 This is a partial structural schematic diagram of a separation device in an embodiment of the present application;

[0030] Figure 5 This is a schematic diagram of the structure of the housing in the embodiment of the present application;

[0031] Figure 6This is a schematic diagram of the structure of the first filtering device in the embodiment of the present application;

[0032] Figure 7 This is a schematic diagram of the structure of a gas-liquid separation device for a ship-shore safety interface for oil and gas recovery at a dock in an embodiment of the present application;

[0033] Figure 8 It is a perspective schematic diagram of a gas-liquid separation device for a ship-shore safety interface for oil and gas recovery at a dock in an embodiment of the present application;

[0034] Fig. 9 This is a schematic diagram of the structure of a gas-liquid separation device for a ship-shore safety interface for oil and gas recovery at a dock in an embodiment of the present application;

[0035] Fig.10 A top view of a gas-liquid separation device for a ship-shore safety interface for oil and gas recovery at a dock in an embodiment of the present application;

[0036] Fig.11 A schematic diagram of the gas flow direction of the gas-liquid separation device for oil and gas separation at the ship-shore safety interface for oil and gas recovery at the wharf in the embodiment of the present application;

[0037] Reference numerals:

[0038] Shell 10, first chamber 110, first inlet 101, first air inlet pipe 102, air inlet pressure measuring port 1021, second cylinder 103, first air outlet pipe 104, air outlet pressure measuring port 1041, second end cap 105, liquid level gauge connecting pipe 106, liquid level gauge upper joint 1061, liquid level gauge lower joint 1062, drainage device 107, drainage trough 1071, drainage pipe 1072, drainage plug 1073, second filter layer 1074, concave flange 108; separation device 20, first cylinder 201, spiral blade 202, first outlet 203 , inner sealing plate -204, first through hole -205, first supporting plate -206, second supporting plate -207, first fixing plate -208; first filter device -30, second chamber -310, fourth chamber -320, filter element fixing plate -301, first filter element body -302, filter element lower sealing plate -303, filter element handle -304; second filter device -40, third chamber -410, first head -401, first filter layer -402, air supply port -403, safety valve port -404, pressure detection port -405, convex flange -406, bolt -407; insulation layer -50; bracket -60. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0040] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0041] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection or mutual communication; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present application can be understood according to the specific circumstances. In addition, the first direction described in the embodiment of the present application is the direction in which the X-axis extends, and the second direction is the direction in which the Y-axis extends. The first direction and the second direction intersect each other. Preferably, the first direction and the second direction are perpendicular to each other; the vertical described in the present application is not absolutely vertical, but can be nearly vertical; the parallel described in the present application is not absolutely parallel, but can be nearly parallel. The first direction X described in the present application can also be a direction from bottom to top. The second direction Y in the present application can also be a direction from left to right.

[0042] Example 1: The treatment of oil and gas at the wharf, especially the oil and gas mixture containing solid particles (hereinafter referred to as oil and gas mixture or mixed gas), is prone to cause equipment blockage, affecting the separation effect and the long-term stable operation of the equipment. The embodiment of the present application provides a gas-liquid separation device for separating oil and gas mixtures containing solid particles, which has the functions of efficient filtration of solid particles, intelligent liquid level monitoring, pressure monitoring and signal output, and can adapt to the safe treatment requirements of oil and gas at the wharf under different working conditions.

[0043] like Figures 1 to 10 As shown, the gas-liquid separation device includes a shell 10, on which a first inlet 101 for gas introduction is provided, the main structure of the shell 10 is a second cylinder 103, above the second cylinder 103 is a second filter device 40, and the main support structure of the second filter device 30 is a first head 401. In some specific embodiments, the second cylinder 103 and the first head 401 are made of materials that comply with GB 150 and are made of corrosion-resistant stainless steel to ensure the pressure bearing capacity and safety of the equipment.

[0044] In the embodiment of the present application, the first air inlet pipe 102 surrounds the first inlet 101 . In some embodiments, the first air inlet pipe 102 extends along the tangent direction of the second cylinder 103 in the second direction Y, and the gas to be treated is delivered into the shell 10 from the first inlet 101 .

[0045] In some embodiments, the second cylinder 103 is further provided with a first gas outlet pipe 104, which is connected to the lower end of the first cylinder 201 in the separation device 20 and is used to discharge the gas sent out from the separation device 20. In some embodiments, the first air inlet pipe 102 and the first air outlet pipe 104 are fixed at the same height.

[0046] In some embodiments, an air inlet pressure measuring port 1021 is provided on the first air inlet pipe 102, and an air outlet pressure measuring port 1041 is provided on the first air outlet pipe 104. A differential pressure transmitter is installed on the air inlet pressure measuring port 1021 and the air outlet pressure measuring port 1041 to monitor the differential pressure at the air inlet and air outlet ends of the gas-liquid separator. When the differential pressure reaches a set value (5 kPa, adjustable), an alarm is triggered to remind that cleaning or replacement is required.

[0047] In some embodiments, the lower end of the second cylinder 103 is provided with a liquid level gauge pipe 106 and a liquid discharge device 107. In addition, the lower end of the second cylinder 103 in the present application is provided with a second head 105, such as Figure 5As shown, the level gauge pipe 106 is located on the second cylinder 103 and the second end cap 105; the level gauge pipe 106 includes an upper joint 1061 and a lower joint 1062, wherein the upper joint 1061 is located on the second cylinder 103 and the lower joint 1062 is located on the second end cap 105. The upper joint 1061 and the lower joint 1062 are provided with a liquid level indicator. In some specific embodiments, the level gauge pipe 106 adopts a magnetic flap level gauge, whose measuring range covers the entire liquid level height in the shell, ensuring accurate indication of the liquid level, and is used to monitor the liquid level of the gas-liquid separator. When the liquid level reaches the high liquid level setting value (adjustable), the liquid is automatically drained, and when the liquid level reaches the high liquid level setting value (adjustable), an alarm is triggered to remind that manual intervention is required for draining. In some specific embodiments, the liquid level meter of the present application is also equipped with high liquid level and high-high liquid level alarms, which are respectively set at different heights of the liquid level meter for real-time monitoring of the liquid level in the shell and sending out an alarm signal when the liquid level reaches the set value, providing a signal to the ship-shore safety device control system to ensure the safe operation of the equipment.

[0048] In some embodiments, the drain device 107 is located at the bottom of the second end cap 105, and the waste separated by the gas-liquid separation device is discharged through the drain device 107. In some embodiments, the drain device 107 includes a drain tank 1071, a drain pipe 1072, and a drain plug 1073. Figure 5 As shown, a second filter layer 1074 is provided in the drain tank 1071 as a third-level filter layer. The second filter layer 1074 uses a corrosion-resistant stainless steel multi-layer wire mesh to intercept the separated fine solid particles. The fine solid particles are buffered in the drain tank 1071 and are regularly discharged from the drain plug 1073. In some embodiments, an automatic valve is provided at the outlet of the drain pipe 1072 to control the opening and closing of the drain port. When the separated liquid needs to be discharged, the valve is automatically opened to perform the drain operation; when the drain is completed, the valve is automatically closed to ensure the sealing of the equipment. In some embodiments, when the separated solid particles need to be discharged, the drain plug 1073 is manually opened to perform the drain operation; when the drain is completed, the valve is closed to ensure the sealing of the equipment.

[0049] In some embodiments, a bracket 60 is further provided at the bottom end of the second cylinder, and the bracket 60 is welded and fixed to the lower part of the second cylinder 103 and avoids the welds between the second cylinder 103 and the air inlet pipe and the air outlet pipe. In some specific embodiments, three container legs are used as the bracket 60, and the three container legs are evenly distributed at an angle of 120°, and the first air outlet pipe 104 is just located in the middle of two of the container legs; Figure 7As shown, the first air inlet pipe 102 is butt-welded along the tangent direction of the cylinder wall of the second cylinder 103 , and the wharf oil and gas entering from the first air inlet pipe 102 rotates upward along the tangent of the cylinder wall and enters the interior of the second cylinder 103 .

[0050] like Figure 3 and Figure 4 As shown, the present application is provided with a separation device 20 inside the second cylinder 103, and the separation device 20 includes a first cylinder 201, and the first cylinder 201 and the shell 10 form a first chamber 110. In some embodiments, the first cylinder 201 and the second cylinder 103 are coaxially arranged (first central axis O1), and a continuous spiral blade 202 is welded to the outer wall of the first cylinder 201. The spiral blade 202 has a spiral structure and rotates counterclockwise. The starting point of the spiral blade 202 is the center of the left side of the first outlet pipe 104. The center of the first outlet pipe 104 described in the present application is the position of the first outlet pipe 104 at the second central axis O2, and the starting point of the spiral blade 202 is located on the left side of the center position of the first outlet pipe 104; the wharf oil and gas to be processed enters along the inner wall of the second cylinder 203 in a tangential direction, and at the same time spirals up from bottom to top along the spiral blade 202, and under the multiple effects of inertia, centrifugal force and gravity, an efficient separation of the oil, gas and water mixture is achieved.

[0051] In some embodiments, the first cylinder 201 has a first end 210 and a second end 220, and the pitch of the spiral blade 202 gradually increases along the direction from the first end 210 to the second end 220. In other embodiments, the spiral blade 202 can be adjusted according to actual needs to adapt to oil-gas mixtures with different flow rates and pressure drop requirements. In some specific embodiments, the pitch gradually increases from 110 mm at the bottom to 200 mm at the top. The present application is provided with a spiral blade 202 in the first chamber 110 to guide the flow direction of the oil-gas mixture in the chamber and improve the separation efficiency.

[0052] The separation device 20 of the present application optimizes the separation effect of the separation device 20 on the oil-gas-water mixture by setting the position of the spiral blade 202 , the structure of the spiral blade 202 , and the structure of the first air intake pipe 102 .

[0053] In some embodiments, the first cylinder 201 is provided with a first outlet 203, which is connected to the first air outlet pipe 104. The lower end of the first cylinder 201 is blocked by an inner sealing plate 204, and a plurality of first through holes 205 are provided on the inner sealing plate 204. In some specific embodiments, the inner sealing plate 204 of the first cylinder 201 has four ￠8 small holes to facilitate filtering and separating the aggregation of tiny droplets, protecting the rear end flame arrester from clogging, and improving the stability and safety of the overall system.

[0054] In some embodiments, the first cylinder 201 is fixed inside the second cylinder 103 by a first support plate 206 and a second support plate 207, and a first fixing plate 208 is provided at the top of the first cylinder 201, and the first cylinder 201 is fixed to the second filter device at its upper end by the first fixing plate 208. In some embodiments, the first support plate 206 and the second support plate 207 fix the first cylinder 201 to the inner wall of the second cylinder 103 by welding. In some embodiments, the first support plate 206 and the second support plate 207 of the present application are arc-shaped structures.

[0055] The separation device 20 of the present application adopts a combination of cyclone separation and gravity separation to improve separation efficiency. The cyclone fold is placed on the outer wall of the inner tube, and the fluid enters the inner wall of the cylinder tangentially. The centrifugal force generated by the rotation throws the liquid to the cylinder wall and the outer wall of the tube to achieve preliminary separation; the centrifugal force of the folded flow rotation is used to make the solid particles or water in the liquid generate different centrifugal forces during the rotation process due to the density difference, thereby achieving gas-water separation. In cyclone separation, the liquid mixture rotates at high speed after entering from the inlet. The centrifugal forces of different components are different. The heavier components will rotate toward the wall and fall to the bottom of the cylinder according to gravity. The lighter components will move toward the central axis of the spiral blade and flow out from the top. The support plate of the first cylinder 201 is designed to be a lower arc to facilitate the sliding of the downstream liquid.

[0056] In some embodiments, the present application provides a first filter device 30 inside the first cylinder 201, a second chamber 310 is formed inside the first filter device, and a fourth chamber 320 is provided between the first filter device 30 and the first cylinder 201. Figure 6 As shown, the first filter device 30 of the present application includes a filter element fixing plate 301, a first filter element body 302, a filter element lower sealing plate 303 and a filter element handle 304. In some embodiments, the first filter element body 302 and the filter element fixing plate 301 form an upper opening for air intake, and the gas entering the first filter element body 302 enters the fourth chamber 320 from the side wall of the first filter element body 302, and the filter structure of the filter element lower sealing plate 303 is vented around the side of the filter element. A movable filter element handle 304 is welded at the entrance of the first filter element body 302 to facilitate the pulling out and storage of the first filter device 30.

[0057] In some embodiments, the first filter element body 302 adopts a stainless steel fiber multilayer design to perform secondary filtration on the oil and gas at the terminal, and can capture tiny particles and droplets. The density of the stainless steel fiber is selected to be compatible with the maximum safe test gap (MESG) value of the flame arrester to ensure that tiny particles will not block the flame arrester gap. Protect the normal operation of the rear-end detonation arrester. The design of the filter structure is easy to clean and maintain, ensuring the long-term stable operation of the equipment.

[0058] In some embodiments, the gas-liquid separation device further includes a second filter device 40, which is located above the first filter device 30. The second filter device 40 includes a first end cap 401 and a first filter layer 402. The first end cap 401 and the first filter layer 402 enclose a third chamber 410, which is connected to the first chamber 110, and the third chamber 410 is connected to the second chamber 310. In some embodiments, the first filter layer 402 is a corrosion-resistant stainless steel multi-layer wire mesh, which performs primary filtration on the oil and gas at the terminal to filter out fine particles and free water vapor.

[0059] In some specific embodiments, the present application further optimizes the structure of the filter layer and the filter element through testing the oil-gas separation effect. The first filter layer 402 and the second filter layer 1074 use a 3mm fine-pore metal wire mesh with a density of 30 meshes, and the first filter element body 302 is woven from 0.5mm metal fibers to form a detachable filter mesh with a density of 200 meshes. The present application improves the separation and filtering effect of the gas-liquid separation device in the embodiment of the present application for the oil-gas mixture containing solid particles through the structural optimization of the separation device 20, the first filter device 30 and the second filter device 40.

[0060] In some embodiments, the second filter device 40 of the present application further includes a gas supply port 403, a safety valve port 404, a pressure detection port 405 and a convex flange 406. The gas supply port 403 of the present application is provided with a gas supply valve, the safety valve port 404 is provided with a safety valve, and the pressure detection port 405 is provided with a pressure transmitter for monitoring the pressure in the gas-liquid separator.

[0061] The present application configures a pressure detector (i.e., a pressure sensor) at both ends of the device to monitor the differential pressure at both ends of the gas-liquid separator, and has a signal output function so as to monitor the operating status of the device in real time. In some specific embodiments, the pressure sensor used in the present application adopts a high-precision pressure transmitter with a signal output function, which can convert the monitored pressure and differential pressure signals into electrical signals and output them to the control system. The gas-liquid separation device of the present application is also provided with a safety valve and a vent on the housing 10 to protect the safety of the equipment when the equipment is overpressured or needs to be vented urgently. The set pressure of the safety valve can be adjusted according to actual needs to ensure that the equipment will not cause accidents due to overpressure during normal operation.

[0062] In some specific embodiments, a low pressure threshold, a first high pressure threshold, and a second high pressure threshold are set. When the pressure measured by the pressure transmitter provided at the pressure detection port 405 is lower than the low pressure threshold, the air supply valve is opened; when the pressure measured by the pressure transmitter provided at the pressure detection port 405 reaches the first high pressure threshold, an alarm is sounded, and timely measures are taken to reduce or close the air intake at the air intake end; when the pressure measured by the pressure transmitter provided at the pressure detection port 405 reaches the second high pressure threshold, an alarm is sounded, and the safety valve is opened to avoid safety hazards such as overpressure or leakage of the equipment. The low pressure threshold, the first high pressure threshold, and the second high pressure threshold in this application can be adjusted according to actual needs.

[0063] like Figure 2 As shown, the outer periphery of the shell 10 of the present application is provided with a heat-insulating layer 50 which is glued and fixed to the outer wall of the shell 10. The provision of the heat-insulating layer and the safety valve of the present application further improves the safety and stability of the equipment. In some specific embodiments, the heat-insulating layer can be made of heat-insulating materials such as rock wool and glass wool.

[0064] In some embodiments, the shell 10 and the second filter device 40 are fixed and disassembled by a fixed sealing fastener 407. In the present application, a concave flange 108 and a convex flange are welded and fixed to the upper end of the second cylinder 103 to fix the first head 403 and the second cylinder 103.

[0065] The gas-liquid separation device of the present application can not only effectively separate the gas and liquid in the oil-gas mixture, but also efficiently filter solid particles, and at the same time has intelligent monitoring and management functions to ensure the safe and efficient operation of the equipment. In addition, the present application further improves the separation efficiency of the oil-gas mixture by designing different separation chambers, meeting application scenarios with different flow and pressure drop requirements.

[0066] Example 2: Recovery and treatment of oil and gas at the wharf

[0067] The gas-liquid separation device shown in Example 1 is used to process oil and gas at the wharf, including:

[0068] The mixed gas enters the first chamber 110 along the tangential direction from the first inlet 101, and the mixed gas spirals upward from bottom to top along the spiral blades 202, and the oil gas and water vapor in the mixed gas are separated under the action of inertia, centrifugal force and gravity;

[0069] After the preliminary separation, the mixed gas enters the third cavity 320 of the second filter device 40, and the mixed gas passes through the first filter layer 402 in the second filter device 40. The first filter layer 402 is woven from fine metal fibers to effectively intercept fine particles. In some specific embodiments, the first filter layer 402 uses a 3mm fine-pore metal wire mesh with a density of 30 meshes.

[0070] The mixed gas filtered by the second filter device 40 enters the second chamber 310 of the first filter device 30. The inner wall of the first filter element body 302 in the first filter device 30 is composed of multiple layers of stainless steel fibers, which are used to filter solid particles in the oil-gas mixture. The density of the first filter element body 302 is selected to be compatible with the maximum safety test gap (MESG) value of the flame arrester to ensure that solid particles will not block the flame arrester gap and protect the normal operation of the rear-end detonation-proof flame arrester. The design of the filter structure is easy to clean and maintain, ensuring the long-term stable operation of the equipment; in some specific embodiments, the first filter element body 302 is woven from 0.5mm metal fibers, and the density of the detachable filter screen is 200 meshes;

[0071] The mixed gas enters the fourth chamber 410 from the second chamber 310 of the first filter element body 301, is sent to the first gas outlet pipe 104 from the first outlet 203 on the first cylinder 201, and then is sent out of the gas-liquid separation device;

[0072] The waste separated by the gas-liquid separation device is discharged through the drainage device 107. Specifically, the present application sets a second filter layer 1074 as a third-level filter layer in the sewage tank 1071. The second filter layer 1074 adopts a corrosion-resistant stainless steel multi-layer wire mesh. In some specific embodiments, the second filter layer adopts a 3mm fine-pore metal wire mesh with a density of 30 meshes to intercept the separated fine particles of solid. The fine particles of solid are buffered in the sewage tank 1071 and are regularly discharged from the sewage plug 1073; the outlet of the drainage pipe 1072 is provided with an automatic valve for controlling the opening and closing of the drainage port. When the separated liquid needs to be discharged, the valve is automatically opened to perform the drainage operation; when the drainage is completed, the valve is automatically closed to ensure the sealing of the equipment. In some embodiments, when the separated solid particles need to be discharged, the sewage plug 1073 is manually opened to perform the sewage discharge operation; when the sewage discharge is completed, the valve is closed to ensure the sealing of the equipment;

[0073] The liquid level indicator installed on the upper joint 1061 and the lower joint 1062 of the liquid level gauge is used to monitor the liquid level of the gas-liquid separator. When the liquid level reaches the high liquid level setting value (adjustable), the liquid is automatically drained. When the liquid level reaches the high liquid level setting value (adjustable), an alarm is sounded to remind that manual intervention is required for draining. At the same time, the high liquid level and high-high liquid level alarms matched with the liquid level gauge of the present application can monitor the liquid level in the shell in real time, and send out an alarm signal when the liquid level reaches the set value, and provide a signal to the ship-shore safety device control system to ensure the safe operation of the equipment.

[0074] In order to ensure the safe operation of the equipment, the differential pressure transmitters installed on the air inlet pressure measuring port 1021 and the air outlet pressure measuring port 1041 monitor the differential pressure at both ends of the air inlet and air outlet of the gas-liquid separator. When the differential pressure reaches the set value, such as 5kPa, an alarm is issued to remind that cleaning or replacement is required;

[0075] The safety valve and venting port provided on the housing 10 are used to protect the safety of the equipment when the equipment is over-pressured or needs to be vented urgently. The set pressure of the safety valve can be adjusted according to actual needs to ensure that the equipment will not have an accident due to over-pressure during normal operation. In some specific embodiments, a low pressure threshold, a first high pressure threshold and a second high pressure threshold are set, such as the low pressure threshold is -3.5kPa, the first high pressure threshold is 14kPa, and the second high pressure threshold is 50kPa. The low pressure threshold, the first high pressure threshold and the second high pressure threshold in this application can be adjusted according to actual needs. When the pressure measured by the pressure transmitter provided at the pressure detection port 405 is lower than the low pressure threshold, the air supply valve on the air supply port 403 is opened; when the pressure measured by the pressure transmitter provided at the pressure detection port 405 is higher than the first high pressure threshold, the air intake of the first inlet 101 is reduced or closed; when the pressure measured by the pressure transmitter provided at the pressure detection port 405 is higher than the second high pressure threshold, an alarm is triggered when the high pressure is high, and the safety valve 404 is opened to avoid over-pressure or leakage of the equipment.

[0076] Application example: The oil and gas transmission system of a ship wharf adopts the gas-liquid separator of this application. The main material is 304 stainless steel, the diameter of the first air inlet pipe and the first air outlet pipe is DN150, the second cylinder is DN400X4, the height of the second cylinder is 1000mm, the design pressure is 1.0MPa, the working pressure is 15kPa, and the maximum oil and gas flow rate is 500m 3 / h. A three-stage filtration structure is set inside the equipment. The first filter layer 402 and the second filter layer 1074 use 3mm fine-pore metal wire mesh with a density of 30 meshes. The first filter element body 302 is woven from 0.5mm metal fibers, and the filter mesh density of the first filter element body 302 is 200 meshes. The spiral blade 202 is 30mm wide, 3mm thick, and has 5.5 turns. The pitch increases gradually from 110mm at the bottom to 200mm at the top. In actual operation, the gas-liquid separator shows a good separation effect, the outlet gas has no tiny impurities, and the flame arrester inlet is clean and intact to meet the design requirements. At the same time, the liquid level monitoring system and the pressure monitoring and control system operate stably, can accurately monitor the changes in liquid level and pressure, and send out alarm signals in time, effectively ensuring the safe operation of the oil and gas transmission system at the terminal.

[0077] The gas-liquid separation device of the present application solves the problems of low gas-liquid separation efficiency, high maintenance cost, insufficient automated monitoring, etc. in the prior art, and improves the safety and stability of the oil and gas transmission system at the terminal. The device can not only effectively separate the gas and liquid in the oil and gas mixture, but also efficiently filter solid particles, and at the same time has intelligent monitoring and management functions. The gas-liquid separation device of the present application ensures the stable operation and efficient separation effect of the equipment through reasonable flow channel design, separation cavity optimization and configuration of safety protection devices. The device has been successfully applied in actual production and has achieved significant economic and social benefits. The device complies with the provisions of GB 150, has functions such as efficient filtration of solid particles, intelligent liquid level monitoring, pressure monitoring and signal output, and can adapt to the safe handling needs of oil and gas at the terminal under different working conditions.

[0078] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0079] The above is a detailed introduction to a wharf oil and gas recovery and processing method provided in an embodiment of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A method for recovering oil and gas at a wharf, characterized in that: include: The mixed gas is fed into the housing (10) from the first inlet (101), a separation device (20) is provided inside the housing (10), a first chamber (110) is provided between the separation device (20) and the housing (10), and the mixed gas is separated into a mixture of oil and gas and water under the action of the separation device (20), thereby completing a primary separation; The mixed gas after the primary separation enters the second chamber (310) of the first filter device (30), the first filter device (30) is located inside the first filter device (30), the first filter device (30) and the separation device (20) form a fourth chamber (320), and the mixed gas after being filtered by the first filter device (30) enters the fourth chamber (320) from the second chamber (310); The mixed gas entering the fourth chamber (320) is sent to the first gas outlet pipe (104) from the first outlet (203).

2. The method for recovering oil and gas at a wharf according to claim 1, characterized in that: The mixed gas is further processed by a second filtering device (40) before being sent to the first filtering device (30).

3. The method for recovering oil and gas at a wharf according to claim 1, characterized in that: The separation device (20) comprises a first cylinder (201), the first cylinder (201) being coaxially arranged with the shell (10), the outer wall of the first cylinder (201) being provided with spiral blades (202), the mixed gas spirally ascends from bottom to top along the spiral blades (202), and the oil gas and water vapor in the mixed gas are separated under the action of inertia, centrifugal force and gravity.

4. The method for recovering oil and gas at a wharf according to claim 3, characterized in that: The first cylinder (201) has a first end (210) and a second end (220), and the pitch of the spiral blade (202) gradually increases along the direction from the first end (210) to the second end (220); and / or, The spiral blade (202) rotates counterclockwise, and the bottom end starting point of the spiral blade (202) is located at the left center of the first outlet (203).

5. The method for recovering oil and gas at a wharf according to claim 4, characterized in that: The shell (10) is provided with a first air intake pipe (102), which extends along the tangential direction of the cylinder wall of the shell (10); the mixed gas enters the first chamber (110) along the inner wall of the second cylinder 203 in the tangential direction, and rotates upward to enter the interior of the shell (10).

6. The method for recovering oil and gas at a wharf according to claim 5, characterized in that: The separation device (20) further comprises an inner sealing plate (204), wherein the inner sealing plate (204) is located at the lower end of the first cylinder (201), and a plurality of first through holes (205) are provided on the inner sealing plate (204); and / or, The separation device (20) further comprises a first support plate (206) and a second support plate (207); the first support plate (206) and the second support plate (207) are respectively located at the upper and lower ends of the first cylinder (201), and are used to fix the first cylinder (201) to the inside of the shell (10); and / or, The first support plate (206) and the second support plate (207) are in an arc-shaped structure.

7. The method for recovering oil and gas at a wharf according to claim 1, characterized in that: The first filter device (30) comprises a filter element fixing plate (301), a first filter element body (302) fixed to the filter element fixing plate (301), and a filter element lower sealing plate (303) arranged below the first filter element body (302), wherein the first filter element body (302) and the filter element fixing plate (301) form an upper opening air intake, and the gas entering the first filter element body (302) enters the fourth chamber (320) from the side wall of the first filter element body (302); and / or, The first filter element body (302) is made of multiple layers of stainless steel fibers.

8. The method for recovering oil and gas at a wharf according to claim 1, characterized in that: The first air inlet pipe (102) is provided with an air inlet pressure measuring port (1021), and the first air outlet pipe (104) is provided with an air outlet pressure measuring port (1041). Differential pressure transmitters are installed on the air inlet pressure measuring port (1021) and the air outlet pressure measuring port (1041) to monitor the differential pressure at both ends of the air inlet and the air outlet of the gas-liquid separator.

9. The method for recovering oil and gas at a wharf according to claim 2, characterized in that: The second filter device (40) is located above the first filter device (30), the second filter device (40) comprises a first seal (401) and a first filter layer (402), the first seal (401) and the first filter layer (402) enclose a third chamber (410), the third chamber (410) is communicated with the first chamber (110), and the third chamber (410) is communicated with the second chamber (310); and / or, The first filter layer (402) is a corrosion-resistant stainless steel multi-layer wire mesh.

10. The method for recovering oil and gas at a wharf according to claim 9, characterized in that: The second filtering device (40) further comprises an air supply port (403), a safety valve port (404) and a pressure detection port (405); the air supply port (403) is provided with an air supply valve, the safety valve port (404) is provided with a safety valve, and the pressure detection port (405) is provided with a pressure transmitter for monitoring the pressure condition in the gas-liquid separator: When the pressure is lower than the low pressure threshold, the air supply valve on the air supply port (403) is opened; When the pressure is higher than a first high pressure threshold, reducing or closing the air intake of the first inlet (101); When the pressure is higher than the second high pressure threshold, an alarm is sounded and the safety valve (404) opens to prevent the equipment from overpressure or leakage.

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