Natural gas pipeline oil mist separation system

Abstract

The invention relates to the technical field of natural gas separation, in particular to a natural gas pipeline oil mist separation system which comprises a gas inlet end, an oil mist separation mechanism, an exhaust end and an oil dirt discharge mechanism, the gas inlet end comprises a natural gas inlet main pipe and two natural gas inlet branch pipes, and the natural gas inlet branch pipes are connected with a filtering device; the two groups of oil mist separation mechanisms are fixedly mounted on the filtering device and are used for separating and removing oil mist in the natural gas; the exhaust end comprises a natural gas outlet main pipe and two natural gas outlet branch pipes; and the oil mist discharging mechanism is connected with the oil mist separating mechanism and is used for recovering and treating the oil mist. The filtering device comprises a filter, and a filtering assembly composed of a filter element support, a coalescence sintering type filter element and a bearing is arranged in the filtering device. The oil mist separation mechanism comprises a high-pressure steam source, a steam conveying pipe, a steam branch pipe and a blade, and oil mist separation is achieved through steam injection. Oil mist in natural gas can be effectively separated, and the filtering efficiency and the natural gas quality are improved.

Description

Technical Field

[0001] The present application relates to the technical field of natural gas filtration, and in particular to a natural gas pipeline oil mist separation system. Background Art

[0002] During transportation and use, natural gas often carries large amounts of impurities such as oil mist and dust. These impurities not only affect the quality of the gas but can also damage downstream equipment. Therefore, an oil mist separation system is required within natural gas pipeline systems to effectively separate and treat the oil mist. Currently, commonly used separation devices in natural gas pipelines include filters and cyclone separators.

[0003] However, existing filters still suffer from the following issues: when natural gas contains excessive oil mist or has high viscosity, it accumulates on the surface of the coalescing and sintering filter element, forming oil droplets and an oil film. This increases the pressure differential across the element and causes frequent alarms in the differential pressure transmitter. This not only reduces filtration efficiency but also increases the frequency of cleaning, seriously impacting the quality of natural gas transported through pipelines. Furthermore, most existing technologies lack effective oil mist recovery and treatment mechanisms, making it impossible to properly recycle the separated oil mist, resulting in resource waste and environmental pollution. Summary of the Invention

[0004] In order to solve the technical problem that when natural gas station filters process natural gas containing excessive oil mist or high viscosity, the oil mist cannot be completely separated, and oil droplets and oil films will be formed and adhered to the surface of the coalescing and sintering filter element, resulting in reduced filtration efficiency and increased cleaning frequency of the coalescing and sintering filter element, which seriously affects the quality of natural gas transported by pipeline and increases the workload of cleaning and replacing the coalescing and sintering filter element, the present invention provides a natural gas pipeline oil mist separation system.

[0005] The oil mist separation system for a natural gas pipeline provided in this application adopts the following technical solution:

[0006] A cyclone separator for a natural gas station, comprising:

[0007] The gas inlet end includes a natural gas inlet main pipe and two natural gas inlet branch pipes, wherein the natural gas inlet main pipe is connected to the two natural gas inlet branch pipes through a three-way electric ball valve; the two natural gas inlet branch pipes are respectively connected to a filter device, and the natural gas inlet branch pipes are connected to the input end of the filter device; the filter device is used to filter dust and oil mist in the natural gas;

[0008] An oil mist separation mechanism, wherein two groups of the oil mist separation mechanisms are provided, and the two groups of the oil mist separation mechanisms are respectively fixedly mounted on the filtering device; the oil mist separation mechanisms are used to separate and remove oil mist from natural gas;

[0009] The exhaust end includes a natural gas outlet main pipe and two natural gas outlet branch pipes, one end of each of the two natural gas outlet branch pipes is connected to the output end of the filtering device, and the other end is connected to the natural gas outlet main pipe; the natural gas outlet main pipe is used to input the filtered natural gas into the downstream pipeline;

[0010] The oil discharge mechanism is connected to the two groups of oil mist separation mechanisms respectively, and is used to recover and process the oil mist in the natural gas.

[0011] In a specific embodiment, the filtering device includes a filter, and a filtering component is provided in the filter;

[0012] The filter assembly includes a filter element holder, a coalesced sintered filter element, and two bearings; the filter element holder is fixedly arranged in the inner cavity of the filter, and the two bearings are respectively installed at the top and bottom ends of the filter element holder, and the projections of the two bearings in the vertical direction coincide with each other, and the inner rings of the bearings are fixedly connected to the filter element holder; the coalesced sintered filter element is sleeved on the two bearings, and the inner wall of the coalesced sintered filter element is fixedly connected to the outer rings of the bearings;

[0013] A liquid level transmitter is installed on the side wall of the filter;

[0014] The bottom of the filter is provided with a sewage outlet, the sewage outlet is connected to a sewage pipe, and the sewage pipe is connected to the oil discharge mechanism;

[0015] A differential pressure transmitter is provided between the input end and the output end of the filtering device.

[0016] In a specific embodiment, the filtering device further includes a displacement mechanism, which includes a nitrogen displacement inlet and a nitrogen displacement outlet, wherein the nitrogen displacement inlet is arranged on the natural gas inlet branch, and the nitrogen displacement outlet is arranged on the natural gas outlet branch.

[0017] In a specific possible implementation scheme, the natural gas inlet branch pipe, the natural gas outlet branch pipe and the sewage pipe are all provided with electric ball valves.

[0018] In a specific embodiment, the oil mist separation mechanism includes a high-pressure steam source, a steam delivery pipe, a first steam branch pipe, a second steam branch pipe, and blades;

[0019] The high-pressure steam source is arranged outside the filter, one end of the steam delivery pipe is located in the filter cavity, and the other end is connected to the high-pressure steam source. The steam delivery pipe is mounted above the coalesced sintered filter element, and one end of the steam delivery pipe located in the filter cavity is connected to the first steam branch pipe and the second steam branch pipe respectively;

[0020] The first steam branch pipe is located outside the coalescing and sintering filter element, and is provided with a plurality of first nozzles, and the plurality of first nozzles are directed toward the outer side wall of the coalescing and sintering filter element and the blades; the second steam branch pipe extends into the inner cavity of the coalescing and sintering filter element, and is provided with a plurality of second nozzles, and the plurality of second nozzles are directed toward the inner side wall of the coalescing and sintering filter element;

[0021] The blades have a certain curvature, are fixedly arranged on the outer side wall of the coalescing and sintering filter element, and a plurality of the blades are evenly distributed along the circumference of the coalescing and sintering filter element.

[0022] In a specific embodiment, the oil mist separation mechanism further includes a heating device, which is disposed in the inner cavity of the filter; the heating device includes an electric heating tube, a temperature transmitter, and a controller, the electric heating tube being spirally disposed in the inner cavity of the filter, and heat transfer oil circulates in the electric heating tube, and the controller is electrically connected to the electric heating tube;

[0023] The temperature transmitter is fixedly arranged on the side wall of the filter; the temperature transmitter is electrically connected to the controller.

[0024] In a specific embodiment, the oil discharge mechanism includes a sewage tank, wherein a partition is vertically provided in the inner cavity of the sewage tank, and the partition divides the inner cavity of the sewage tank into an oil-water collection chamber and an oil discharge chamber, and the oil-water collection chamber and the oil discharge chamber are connected above; two tuning fork liquid level transmitters are installed on the side wall of the oil-water collection chamber, and the two tuning fork liquid level transmitters are located at different heights of the oil-water collection chamber; the height of the tuning fork liquid level transmitter located above is lower than the height of the partition; the two tuning fork liquid level transmitters are both used to monitor the height of the oil-water interface;

[0025] A discharge port is provided at the bottom of the oil-water collecting chamber, and a discharge pipe is connected to the discharge port; a first solenoid valve is installed on the discharge pipe;

[0026] The bottom of the oil discharge chamber is connected to an oil discharge pipe, and the oil discharge pipe is used to discharge the oil to a recovery device.

[0027] In a specific feasible implementation scheme, the oil discharge mechanism also includes an external water source and an external water input pipe, one end of the external water input pipe is connected to the external water source, and the other end extends into the inner cavity of the sewage tank, and the external water input pipe is located above the oil and water collection chamber, and a second solenoid valve is provided on the external water input pipe.

[0028] In a specific implementation manner, the two tuning fork liquid level transmitters are both electrically connected to the first solenoid valve and the second solenoid valve.

[0029] In a specific embodiment, the outer side walls of the sewage pipe, sewage tank and discharge pipe are all covered with electric heating cables and thermal insulation materials.

[0030] In summary, this application includes at least one of the following beneficial technical effects:

[0031] 1. The present invention arranges blades on the outer wall of the coalescing and sintering filter element, and sprays steam to the inner wall of the coalescing and sintering filter element through the second nozzle. The high-pressure steam melts the oil and dirt adhered to the surface of the coalescing and sintering filter element. At the same time, when the first nozzle sprays high-pressure steam to the blades, the blades produce a rotational motion, driving the coalescing and sintering filter element to rotate. Under the action of centrifugal force, the oil and dirt are thrown to the inner wall of the filter and flow to the drain outlet for separation. The filter element adopts a coalescing and sintering filter element, which has high compressive strength, high temperature resistance, and strong impact resistance, thereby achieving effective separation of oil and dirt and improving filtration efficiency.

[0032] 2. The present invention adopts a one-in-one-standby working mode, and controls the natural gas distribution through a three-way electric ball valve, ensuring that the natural gas pipeline can filter and separate normally while continuously supplying natural gas, thereby ensuring the normal gas supply volume downstream.

[0033] 3. The present invention adopts an interlocking control method of a sewage tank and a controller, and divides the inner cavity of the sewage tank into an oil-water collection chamber and an oil discharge chamber through a partition, thereby achieving further separation of oil and water; according to the oil-water interface height monitored by the tuning fork level gauge, the first solenoid valve and the second solenoid valve are opened and closed accordingly, thereby achieving automatic control of the oil-water interface, so that the oil automatically crosses the partition and enters the oil discharge chamber, which is convenient for recycling the oil.

[0034] 4. The present invention uses a heating device inside the filter to facilitate the melting of oil stains attached to the coalescing and sintering filter element, and can also dry the filter, thereby improving the cleaning efficiency of the coalescing and sintering filter element, avoiding manual cleaning of the coalescing and sintering filter element, and reducing workload. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application.

[0036] Figure 1 This is a schematic diagram of the overall structure of a natural gas pipeline oil mist separation system according to an embodiment of the present application;

[0037] Figure 2 This is a schematic diagram of the overall structure of the filtering device according to an embodiment of the present application;

[0038] Figure 3 Schematic diagram of the overall structure of the oil mist separation mechanism and the first nozzle driving blade in an embodiment of the present application;

[0039] Figure 4 This is a schematic diagram of the overall structure of the oil discharge mechanism of the embodiment of the present application;

[0040] Figure 5 Schematic diagram of the liquid level of the oil-water mixture in the sewage tank according to the embodiment of the present application;

[0041] Description of the drawings: 1. Inlet end; 11. Natural gas inlet main pipe; 12. Natural gas inlet branch pipe; 13. Three-way electric ball valve; 14. Filter device; 141. Filter; 1411. Filter element bracket; 1412. Coalescing sintered filter element; 1413. Bearing; 1414. Liquid level transmitter; 1415. Drain pipe; 142. Displacement mechanism; 1421. Nitrogen displacement inlet; 1422. Nitrogen displacement outlet; 143. Differential pressure transmitter; 144. Electric throttling stop vent valve; 15. Electric ball valve; 2. Oil mist separation mechanism; 21. High-pressure steam source; 22. Steam delivery pipe; 23. First steam branch pipe; 231, first nozzle; 24, second steam branch pipe; 241, second nozzle; 25, blade; 26, heating device; 261, electric heating pipe; 262, temperature transmitter; 3, exhaust end; 31, natural gas outlet main pipe; 32, natural gas outlet branch pipe; 4, oil and sewage discharge mechanism; 41, sewage tank; 411, partition; 412, oil and water collection chamber; 4121, tuning fork liquid level transmitter; 4122, discharge port; 4123, discharge pipe; 4124, first solenoid valve; 413, oil discharge chamber; 4131, oil drain pipe; 42, external water source; 43, external water input pipe; 431, second solenoid valve. DETAILED DESCRIPTION

[0042] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0043] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features indicated. Thus, features specified as "first" or "second" may explicitly or implicitly include one or more of such features; and in the description of this application, unless otherwise specified, "plurality" means two or more.

[0044] The following is combined with Figure 1-5 This application is described in further detail.

[0045] The embodiment of the present application discloses a natural gas pipeline oil mist separation system.

[0046] Reference Figure 1 A natural gas pipeline oil mist separation system includes: an air inlet end 1, an oil mist separation mechanism 2, an exhaust end 3 and an oil discharge mechanism 4. The inlet end 1 includes a natural gas inlet main pipe 11 and two natural gas inlet branch pipes 12. The natural gas inlet main pipe 11 is connected to the two natural gas inlet branch pipes 12 through a three-way electric ball valve 13. The two natural gas inlet branch pipes 12 are respectively connected to a filter device 14, and the natural gas inlet branch pipes 12 are connected to the input end of the filter device 14. The filter device 14 is used to filter dust impurities in the natural gas. Two groups of oil mist separation mechanisms 2 are provided, and the two groups of oil mist separation mechanisms 2 are respectively fixedly mounted on the filter devices 14. The oil mist separation mechanisms 2 are used to separate and remove oil mist from the natural gas. The exhaust end 3 includes a natural gas outlet main pipe 31 and two natural gas outlet branch pipes 32. One end of the two natural gas outlet branch pipes 32 is connected to the output end of the two filter devices 14, respectively, and the other end is connected to the natural gas outlet main pipe 31. The natural gas outlet main pipe 31 is used to input the filtered natural gas into the downstream pipeline. The oil discharge mechanism 4 is respectively connected to the two groups of oil mist separation mechanisms 2 for recovering and treating the oil mist in the natural gas.

[0047] Reference Figure 2 The filtering device 14 includes a filter 141 and a replacement mechanism 142, and a filtering assembly is arranged in the filter 141; the filtering assembly includes a filter element bracket 1411, a coalesced sintered filter element 1412 and two bearings 1413; the filter element bracket 1411 is fixedly arranged in the inner cavity of the filter 141, and the two bearings 1413 are respectively installed at the top and bottom ends of the filter element bracket 1411, and the projections of the two bearings 1413 in the vertical direction coincide, and the inner ring of the bearing 1413 is fixedly connected to the filter element bracket 1411; the coalesced sintered filter element 1412 is sleeved on the two bearings 1413, and the inner wall of the coalesced sintered filter element 1412 is fixedly connected to the outer ring of the bearing 1413; the coalesced sintered filter element 1412 adopted in this filter element has high pressure resistance, high temperature resistance and strong impact resistance. Furthermore, the coalescing sintered filter element 1412 is made of 316L stainless steel or nickel-based alloy, and can be used in working conditions where natural gas contains corrosive media H2S and CO2 acidic gases; it supports backwash regeneration, has strong anti-clogging ability, and high dirt holding capacity; it integrates filtration, coalescing, and separation functions, realizes effective separation of oil and dirt, and improves filtration efficiency.

[0048] Reference Figure 2A liquid level transmitter 1414 is installed on the side wall of the filter 141; a drain outlet is provided at the bottom of the filter 141, and the drain outlet is connected to a drain pipe 1415, which is connected to the oil discharge mechanism 4; an electric throttling stop vent valve 144 is provided near the top of the filter 141, which is used to discharge the residual natural gas inside when cleaning the filter 141; a pressure differential transmitter 143 is provided between the input and output ends of the filter device 14, and the pressure differential transmitter 143 can monitor the pressure difference between the input and output ends of the filter device 14 in real time to determine whether the agglomerated sintered filter element 1412 is blocked. The displacement mechanism 142 includes a nitrogen displacement inlet 1421 and a nitrogen displacement outlet 1422. Nitrogen displacement inlet 1421 is located on the natural gas inlet branch 12, while nitrogen displacement outlet 1422 is located on the natural gas outlet branch 32. When the coalescing and sintering filter element 1412 becomes clogged and requires cleaning, the electric throttling shutoff vent valve 144 opens, allowing residual natural gas inside to escape. Nitrogen is then introduced into the filter device 14 through nitrogen displacement inlet 1421, and the gas inside the filter device 14 is discharged through nitrogen displacement outlet 1422, thereby preventing the safety risk posed by residual natural gas during the cleaning of the coalescing and sintering filter element 1412. Electric ball valves 15 are installed on the natural gas inlet branch 12, the natural gas outlet branch 32, and the drain pipe 1415 to ensure that the filter device 14 is not operating.

[0049] Reference Figure 3The oil mist separation mechanism 2 includes a high-pressure steam source 21, a steam delivery pipe 22, a first steam branch pipe 23, a second steam branch pipe 24, a blade 25 and a heating device 26; the high-pressure steam source 21 is arranged outside the filter 141, one end of the steam delivery pipe 22 is located in the inner cavity of the filter 141, and the other end is connected to the high-pressure steam source 21, the steam delivery pipe 22 is mounted above the coalescing sintered filter element 1412, and the steam delivery pipe 22 is located in the inner cavity of the filter 141. One end is connected to the first steam branch pipe 23 and the second steam branch pipe 24 respectively; the first steam branch 23 is located in the coalescing sintered filter element 141. On the outside of the core 1412, a plurality of first nozzles 231 are provided on the first steam branch pipe 23, and the plurality of first nozzles 231 are directed toward the outer side wall of the coalescing and sintering filter element 1412 and the blades 25; the second steam branch pipe 24 extends into the inner cavity of the coalescing and sintering filter element 1412, and a plurality of second nozzles 241 are provided on the second steam branch pipe 24, and the plurality of second nozzles 241 are directed toward the inner side wall of the coalescing and sintering filter element 1412; the blades 25 are fixedly provided on the outer side wall of the coalescing and sintering filter element 1412, and the plurality of blades 25 are evenly distributed along the circumference of the coalescing and sintering filter element 1412. The heating device 26 is arranged in the inner cavity of the filter 141. The heating device 26 includes an electric heating tube 261, a temperature transmitter 262 and a controller (not shown in the figure). The electric heating tube 261 is spirally arranged in the inner cavity of the filter 141, and heat transfer oil circulates in the electric heating tube 261. The controller is electrically connected to the electric heating tube 261; the temperature transmitter 262 is fixedly arranged on the side wall of the filter 141; the temperature transmitter 262 is electrically connected to the controller. When cleaning and separating oil contaminants from filter 141, the controller sets the operating range of electric heating tube 261. When temperature transmitter 262 detects that the temperature within filter 141 is below the minimum set temperature, the controller activates electric heating tube 261, raising the temperature of the thermal oil circulating within it. This heat is then transferred to the filter 141 through electric heating tube 261, causing the oil contaminants to heat up and melt, allowing them to flow normally to the drain pipe. This prevents the oil contaminants from re-adhering to the sidewalls of filter 141 and improves the cleaning effect on coalescing sintered filter element 1412. When temperature transmitter 262 detects that the temperature within filter 141 approaches or reaches the maximum set temperature, the controller deactivates electric heating tube 261, slowly lowering the temperature within filter 141 to prevent safety risks. To ensure the normal flow of oil droplets, the set temperature range is generally between 20°C and 70°C, with the maximum set temperature not exceeding the equipment design temperature. At the same time, after the coalescing sintered filter element 1412 is cleaned, the heating device 26 can also evaporate the moisture in the inner cavity of the filter 141 to avoid the increase of moisture in the natural gas during filtration and reduce the purity of the natural gas in the downstream pipeline.

[0050] Reference Figure 4The oil discharge mechanism 4 includes a sewage tank 41, an external water source 42 and an external water input pipe 43. A partition 411 is vertically provided in the inner cavity of the sewage tank 41. The partition 411 divides the inner cavity of the sewage tank 41 into an oil-water collecting chamber 412 and an oil discharge chamber 413. The oil-water collecting chamber 412 is connected to the upper part of the oil discharge chamber 413. Two tuning fork liquid level transmitters 4121 are installed on the side wall of the oil-water collecting chamber 412, and the two tuning fork liquid level transmitters 4121 are located at the opposite ends of the oil-water collecting chamber 412. At the same height; the tuning fork level transmitter 4121 located above is lower than the height of the partition 411; both tuning fork level transmitters 4121 are used to monitor the oil-water interface height; a drain port 4122 is provided at the bottom of the oil-water collection chamber 412, to which a drain pipe 4123 is connected; a first solenoid valve 4124 is installed on the drain pipe 4123; an oil drain pipe 4131 is connected to the bottom of the oil discharge chamber 413, which is used to discharge the oil to a recovery device. One end of the external water input pipe 43 is connected to the external water source 42, and the other end extends into the inner cavity of the sewage tank 41. The external water input pipe 43 is located above the oil-water collection chamber 412 and is provided with a second solenoid valve 431. Both tuning fork level transmitters 4121 are electrically connected to the first solenoid valve 4124 and the second solenoid valve 431.

[0051] Specifically, the outer walls of sewage pipe 1415, sewage tank 41, and oil drain pipe 4131 are coated with heating cables and insulation (not shown). These heating cables and insulation heat sewage pipe 1415, sewage tank 41, and oil drain pipe 4131 during the discharge of the oil-water mixture and separated oil, preventing the oil from cooling and adhering to the inner walls of the pipes, potentially causing blockage.

[0052] The operating principle of the natural gas pipeline oil mist separation system of this embodiment is as follows: When natural gas is transported from a natural gas station to a downstream pipeline, it enters through the natural gas inlet main pipe 11 and then, under the action of a three-way electric ball valve 13, enters one of the natural gas inlet branch pipes 12. After entering the filter device 14, dust impurities and oil mist are filtered out. The filtered natural gas enters the natural gas outlet main pipe 31 through the natural gas outlet branch pipe 32 and then flows into the downstream pipeline. As small-diameter water and oil mist in the natural gas pass through the coalescing sintered filter element 1412, they continuously coalesce on the filter element, gradually transforming from small diameter droplets to larger diameter droplets. These droplets are initially separated by gravity, then enter the drain pipe 1415 at the bottom of the filter 141 and are discharged to the drain tank 41 for further oil-water separation.

[0053] During the natural gas filtration process, a pressure transmitter monitors the pressure differential between the input and output ends of filter 141 in real time. When the pressure differential reaches a set value, it is determined that coalescing sintered filter element 1412 is clogged. Oil mist and dust impurities adhere to the surface of coalescing sintered filter element 1412, forming oil contamination and requiring cleaning. To perform this cleaning, the three-way electric ball valve 13 is first switched, allowing the other filter unit 14 to operate, ensuring a normal natural gas supply. Then, close the electric ball valve 15 on the natural gas inlet branch 12 where the clogged filter 141 is located, open the electric throttling stop vent valve 144, so that the residual natural gas in the clogged filter 141 is discharged, and when the pressure of the natural gas outlet branch 32 is at normal pressure, add nitrogen to the nitrogen replacement inlet 1421, open the nitrogen replacement inlet 1421 and the nitrogen replacement outlet 1422, so that the natural gas in the clogged filter 141 is completely discharged and replaced by nitrogen, then turn on the high-pressure steam source 21, the high-pressure steam source 21 outputs high-pressure steam (the pressure of the high-pressure steam is less than the design pressure value of the filter 141 and the pipeline), and enters the first steam branch 23 and the second steam branch 24 through the steam delivery pipe 22, and the high-pressure steam is discharged from the first nozzle 23 and the second steam branch 24 respectively. 1 and the second nozzle 241 are discharged. The first nozzle 231 sprays high-pressure steam onto the outer wall of the coalescing and sintering filter element 1412 and the blade 25. The second nozzle 241 sprays high-pressure steam onto the inner wall of the coalescing and sintering filter element 1412. The high-pressure steam melts the oil adhered to the surface of the coalescing and sintering filter element 1412. At the same time, the blade 25 is affected by the unbalanced force and rotates. Driven by the blade 25, the coalescing and sintering filter element 1412 rotates around the bearing 1413 following the blade 25, thereby generating centrifugal force, so that the oil on the surface of the coalescing and sintering filter element 1412 is thrown to the inner wall of the filter 141, thereby cleaning the oil. Under the action of the heating device 26, the melted oil gathers at the drain port and enters the drain tank 41 through the drain pipe 1415.

[0054] Reference Figure 5When the mixture of oil and sewage flows into the sewage tank 41, it collects in the oil-water collection chamber 412. Due to the difference in density, the oil and sewage separate into layers, allowing operators to process the oil-water mixture according to actual needs. When oil recovery is no longer necessary, hot water is added to the external water source 42, and a strong base is added to the hot water to form a hot lye solution. The hot lye solution enters the oil-water collection chamber 412 through the external water inlet pipe 43. The first solenoid valve 4124 opens, and the solution is discharged through the drain pipe 4123. When oil pollution needs to be recovered, the two tuning fork level transmitters 4121 can respectively monitor the low value h1 and the high value h2 of the oil-water interface, wherein the height h2 is lower than the height of the partition 411. When the oil-water mixture accumulates in the oil-water collecting chamber, when the oil-water liquid level is lower than h1, the two tuning fork level transmitters 4121 cannot detect the frequency change of the liquid level. The second solenoid valve 431 is opened, the first solenoid valve 4124 is closed, and the external water source 42 injects water into the oil-water collecting chamber 412 through the external water input pipe 43, so that the oil-water interface height rises. When the oil-water interface height rises to h1, it is located at the lower The tuning fork level transmitter 4121 on the left detects a change in the medium, causing the frequency of the tuning fork level transmitter 4121 below to change. The second solenoid valve 431 is closed, and the injection of water into the oil-water collecting chamber 412 is stopped. As the oil-water mixture continues to enter the oil-water collecting chamber 412, the oil-water interface height continues to rise. When the oil-water interface height rises to h2, the tuning fork level transmitter 4121 located above detects a change in the medium, causing the frequency of the tuning fork level transmitter 4121 above to change. The first solenoid valve 4124 is opened, allowing the water layer below the oil layer to pass through the discharge port 4122 and be discharged from the discharge pipe 4123. The two tuning fork liquid level transmitters 4121 ensure that the oil-water interface height is always maintained between h1 and h2. The sewage below the oil-water interface is always blocked by the partition 411 in the oil-water collection chamber 412. With the continuous influx of the oil-liquid mixture, the oil-water interface height is maintained within the range of h1 to h2, and the oil layer height above the oil-water interface continues to increase. When the oil layer height rises to the height of the partition 411, the oil layer passes over the partition 411 and enters the oil discharge chamber 413. The oil enters the recovery device through the oil drain pipe 4131 below the oil discharge chamber 413. After the separated oil is collected, it can be reused in the equipment lubrication or cooling system.

[0055] The above embodiments are intended only to illustrate the technical solutions of the present application and are not intended to limit them. The present application is not limited to the precise structures described above and illustrated in the accompanying drawings, and it cannot be assumed that the specific implementation of the present application is limited to these descriptions. For those skilled in the art of the present application, any changes and modifications made without departing from the concept of the present application should be deemed to fall within the scope of protection of the present application.

Claims

1. A natural gas pipeline oil mist separation system, characterized in that: include: The gas inlet end (1) comprises a natural gas inlet main pipe (11) and two natural gas inlet branch pipes (12), wherein the natural gas inlet main pipe (11) is connected to the two natural gas inlet branch pipes (12) respectively through a three-way electric ball valve (13); the two natural gas inlet branch pipes (12) are respectively connected to a filter device (14), and the natural gas inlet branch pipes (12) are connected to the input end of the filter device (14); the filter device (14) is used to filter dust and oil mist in the natural gas; An oil mist separation mechanism (2), wherein two groups of the oil mist separation mechanisms (2) are provided, and the two groups of the oil mist separation mechanisms (2) are respectively fixedly mounted on the filtering device (14); the oil mist separation mechanism (2) is used to separate and remove oil mist in natural gas; The exhaust end (3) comprises a natural gas outlet main pipe (31) and two natural gas outlet branch pipes (32), one end of each of the two natural gas outlet branch pipes (32) being connected to the output end of the filtering device (14), and the other end of each of the two natural gas outlet branch pipes (32) being connected to the natural gas outlet main pipe (31); the natural gas outlet main pipe (31) is used to input the filtered natural gas into a downstream pipeline; An oil discharge mechanism (4) is connected to the two groups of oil mist separation mechanisms (2) respectively, and is used to recover and process oil mist in natural gas.

2. A natural gas pipeline oil mist separation system according to claim 1, characterized in that: The filtering device (14) comprises a filter (141), wherein a filtering component is provided in the filter (141); The filter assembly comprises a filter element support (1411), a coalesced sintered filter element (1412), and two bearings (1413); the filter element support (1411) is fixedly arranged in the inner cavity of the filter (141); the two bearings (1413) are respectively mounted on the top and bottom ends of the filter element support (1411), and the projections of the two bearings (1413) in the vertical direction overlap, and the inner rings of the bearings (1413) are fixedly connected to the filter element support (1411); the coalesced sintered filter element (1412) is sleeved on the two bearings (1413), and the inner wall of the coalesced sintered filter element (1412) is fixedly connected to the outer rings of the bearings (1413); A liquid level transmitter (1414) is installed on the side wall of the filter (141); The bottom of the filter (141) is provided with a sewage outlet, the sewage outlet is connected to a sewage pipe (1415), and the sewage pipe (1415) is connected to the oil discharge mechanism (4); A differential pressure transmitter (143) is provided between the input end and the output end of the filtering device (14).

3. A natural gas pipeline oil mist separation system according to claim 2, characterized in that: The filtering device (14) further comprises a displacement mechanism (142), the displacement mechanism (142) comprising a nitrogen displacement inlet end (1421) and a nitrogen displacement outlet end (1422), the nitrogen displacement inlet end (1421) being arranged on the natural gas inlet branch pipe (12), and the nitrogen displacement outlet end (1422) being arranged on the natural gas outlet branch pipe (32).

4. A natural gas pipeline oil mist separation system according to claim 2, characterized in that: The natural gas inlet branch pipe (12), the natural gas outlet branch pipe (32) and the sewage pipe (1415) are all provided with electric ball valves (15).

5. The natural gas pipeline oil mist separation system according to claim 2, characterized in that: The oil mist separation mechanism (2) comprises a high-pressure steam source (21), a steam delivery pipe (22), a first steam branch pipe (23), a second steam branch pipe (24), and blades (25); The high-pressure steam source (21) is arranged outside the filter (141); one end of the steam delivery pipe (22) is located in the inner cavity of the filter (141), and the other end is connected to the high-pressure steam source (21); the steam delivery pipe (22) is mounted above the coalesced sintered filter element (1412), and one end of the steam delivery pipe (22) located in the inner cavity of the filter (141) is connected to the first steam branch pipe (23) and the second steam branch pipe (24); The first steam branch pipe (23) is located outside the coalescing and sintering filter element (1412), and a plurality of first nozzles (231) are provided on the first steam branch pipe (23), and the plurality of first nozzles (231) are directed toward the outer wall of the coalescing and sintering filter element (1412) and the blades (25); the second steam branch pipe (24) extends into the inner cavity of the coalescing and sintering filter element (1412), and a plurality of second nozzles (241) are provided on the second steam branch pipe (24), and the plurality of second nozzles (241) are directed toward the inner wall of the coalescing and sintering filter element (1412); The blades (25) are fixedly arranged on the outer side wall of the coalescing and sintering filter element (1412), and a plurality of the blades (25) are evenly distributed along the circumference of the coalescing and sintering filter element (1412).

6. The natural gas pipeline oil mist separation system according to claim 5, characterized in that: The oil mist separation mechanism (2) further comprises a heating device (26), the heating device (26) being arranged in the inner cavity of the filter (141); the heating device (26) comprising an electric heating pipe (261), a temperature transmitter (262) and a controller, the electric heating pipe (261) being spirally arranged in the inner cavity of the filter (141), and heat-conducting oil circulating in the electric heating pipe (261), and the controller being electrically connected to the electric heating pipe (261); The temperature transmitter (262) is fixedly arranged on the side wall of the filter (141); the temperature transmitter (262) is electrically connected to the controller.

7. The natural gas pipeline oil mist separation system according to claim 2, characterized in that: The oil-contaminated discharge mechanism (4) comprises a sewage tank (41), wherein a partition (411) is vertically provided in the inner cavity of the sewage tank (41), wherein the partition (411) divides the inner cavity of the sewage tank (41) into an oil-water collection chamber (412) and an oil discharge chamber (413), wherein the oil-water collection chamber (412) and the oil discharge chamber (413) are communicated with each other at their upper sides; two tuning fork level transmitters (4121) are installed on the side wall of the oil-water collection chamber (412), and the two tuning fork level transmitters (4121) are located at different heights of the oil-water collection chamber (412); the height of the tuning fork level transmitter (4121) located at the upper side is lower than the height of the partition (411); and the two tuning fork level transmitters (4121) are both used to monitor the height of the oil-water interface; The bottom of the oil-water collecting chamber (412) is provided with a discharge port (4122), and a discharge pipe (4123) is connected to the discharge port (4122); a first solenoid valve (4124) is installed on the discharge pipe (4123); The bottom of the oil discharge chamber (413) is connected to an oil discharge pipe (4131), and the oil discharge pipe (4131) is used to discharge the oil to a recovery device.

8. The natural gas pipeline oil mist separation system according to claim 7, characterized in that: The oil-contaminated discharge mechanism (4) further comprises an external water source (42) and an external water input pipe (43). One end of the external water input pipe (43) is connected to the external water source (42), and the other end extends into the inner cavity of the sewage discharge tank (41). The external water input pipe (43) is located above the oil-contaminated water collecting chamber (412). A second solenoid valve (431) is provided on the external water input pipe (43).

9. The natural gas pipeline oil mist separation system according to claim 8, characterized in that: The two tuning fork liquid level transmitters (4121) are both electrically connected to the first solenoid valve (4124) and the second solenoid valve (431).

10. The natural gas pipeline oil mist separation system according to claim 7, characterized in that: The outer side walls of the sewage pipe (1415), the sewage tank (41) and the discharge pipe (4123) are all covered with electric heating cables and thermal insulation materials.

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