A low concentration oil and gas tail gas treatment device

Abstract

The present invention relates to the technical field of oil and gas tail gas devices, and discloses a low-concentration oil and gas tail gas treatment device, including an equipment housing, the equipment housing adopts an upper cylindrical and lower conical structure, the interior of the equipment housing is provided with a cathode and cathode structure, the top of the equipment housing is provided with a positive and negative electrode structure, the cathode and cathode structures are connected with the positive and negative electrode structures, the top of the equipment housing is provided with a standard discharge port, and the interior of the equipment housing is provided with an electrolyte. The present invention is provided with an electrochemical oxidation decomposer. When the electrochemical oxidation decomposer is in operation, the power is first turned on to make the electrode oxidative, and the low-temperature oil and gas compressed by the booster concentrator flows into the interior of the oil and gas storage tank, and enters the electrochemical oxidation decomposer at a pressure of 0.10-0.2MPa, and at the same time, the filling electrode particles are suspended in the electrolyte to improve the conductivity and increase the electrolysis effect.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas tail gas devices, and in particular to a low-concentration oil and gas tail gas treatment device. Background Art

[0002] In September 2022, the Ministry of Housing and Urban-Rural Development issued the "Technical Standard for Oil and Gas Recovery and Treatment Facilities" as a national standard, numbered GB / T50759-2022, which will be implemented from December 1, 2022. The original national standard "Design Specification for Oil and Gas Recovery Facilities in Oil Loading Systems" (GB50759-2012) was abolished at the same time. The "Technical Standard for Oil and Gas Recovery and Treatment Facilities" GB / T50759-2022 puts forward the concept of oil and gas treatment devices. Oil and gas treatment devices refer to: devices that treat oil and gas using combustion, oxidation, plasma, etc.

[0003] Most oil and gas recovery devices, after processing oil and gas, the tail gas concentration is 200-300mg / m3, such as methanol tail gas, diesel, etc. It does not meet the national emission standards, so it needs to enter the oil and gas processing device for further processing.

[0004] Oil and gas processing devices, common combustion methods include: RTO furnace, TO furnace, etc. These oil and gas recovery and processing devices generally require auxiliary natural gas, and the devices are complex, occupy a large area, and the furnace has an open flame, which requires a safe distance of more than 30 meters from the tank area. The common oxidation method is mainly the CO furnace, which is characterized by oxidizing the oil and gas components under the action of the catalyst at a temperature of about 300°C without an open flame. The disadvantage is that the furnace regularly produces a large amount of waste catalysts and the processing efficiency is low. Therefore, the development of a new type of oil and gas processing device is a trend in oil and gas processing. Summary of the invention

[0005] The object of the present invention is to provide a low-concentration oil and gas tail gas treatment device to solve the problems raised in the above background technology.

[0006] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0007] The present invention is a low-concentration oil and gas tail gas treatment device, comprising a refrigerator and a dehydrator, the refrigerator and the dehydrator are connected to each other, a first liquid nitrogen inlet and a first nitrogen outlet are arranged on the outer wall of the refrigerator, a second liquid nitrogen inlet and a second nitrogen outlet are arranged on the outer wall of the dehydrator, a drain port is arranged at the bottom of the dehydrator, and an air inlet is arranged on the outer wall of the dehydrator;

[0008] The refrigerator and the dehydrator are respectively provided with regulating valves for adjusting the temperature;

[0009] The outer wall of the refrigerator is connected to a booster concentrator, one end of the booster concentrator is connected to an oil and gas storage tank, and the outer wall of the oil and gas storage tank is connected to an electrochemical oxidation decomposer for oil and gas tail gas treatment;

[0010] The electrochemical oxidation decomposer includes an equipment shell, which adopts an upper cylindrical and lower conical structure, and the volume of the cylinder and the cone is 4-5:1. The interior of the equipment shell is provided with a cathode and cathode structure, and the top of the equipment shell is provided with a positive and negative electrode structure. The cathode and cathode structures are connected with the positive and negative electrode structures. The top of the equipment shell is provided with a standard discharge port, and the interior of the equipment shell is provided with an electrolyte.

[0011] In this embodiment, the purpose of the above-mentioned setting is that the electrochemical oxidation decomposer adopts a DC power supply, the power supply is controlled at 10-12V, the current is controlled at 800-1000A, and the low-concentration oil and gas first enters the dehydrator. The dehydrator adopts liquid nitrogen as a cold source. The liquid nitrogen enters the interior of the dehydrator from the second liquid nitrogen inlet, and the temperature of the dehydrator is controlled by a regulating valve. Generally, the temperature of the dehydrator is controlled at 0-3°C to remove the moisture in the oil and gas exhaust gas to prevent clogging of subsequent equipment.

[0012] The dehydrated tail gas enters the refrigerator, and the refrigerator controls the temperature of the refrigerator through the regulating valve. Generally, the temperature of the refrigerator is controlled at -10--15℃. The function of the refrigerator is to reduce the temperature of oil and gas, improve the safety of later compression, and prevent the spontaneous combustion of oil and gas. The oil and gas tail gas after dehydration and refrigeration enters the booster concentrator for compression. The oil and gas compression has two main functions:

[0013] First, the exhaust concentration is increased to 400-600mg / m3 or above. At the same time, the refrigerator in front is to reduce the oil and gas temperature, improve safety, and compress at low temperature to improve the contact effect in the later stage;

[0014] The second is to increase the tail gas pressure so that it can stir the electrode particles in the later stage and make it easier for the tail gas to pass through the electrode;

[0015] The oil and gas tail gas after the booster concentrator enters the oil and gas storage tank, maintaining a pressure of 0.10-0.2MPa;

[0016] The anode and cathode structures and the positive and negative electrode structures on the equipment shell are connected, and the positive and negative electrode structures are energized. The anode and cathode structures cooperate with the electrolyte to oxidize and decompose the organic matter in the oil and gas exhaust. 50% of the interior of the equipment shell is electrolyte, which decomposes into carbon dioxide and water. The exhaust gas that meets the oxidation standard is discharged from the standard emission port of the equipment shell.

[0017] Furthermore, the anode and cathode structures include a hexagonal hole anode and a circular hole cathode, and the two circular hole cathodes are respectively arranged at the two ends of the bottom of the device shell, and the two circular hole cathodes penetrate and extend to the outside of the device shell;

[0018] The hexagonal hole anode forms a U-shaped structure, two ends of which are respectively arranged at the two ends of the bottom of the device shell, and the top of the hexagonal hole anode penetrates and extends to the outside of the device shell.

[0019] In this embodiment, the purpose of the above arrangement is that the top of the device housing is a contact point for the hexagonal hole anode and the round hole cathode, which are used to connect to the positive electrode and the negative electrode respectively.

[0020] Furthermore, the positive and negative electrode structure includes a positive electrode and a negative electrode, two ends of the negative electrode are respectively connected to two ends of the circular hole cathode, and one end of the positive electrode is connected to the top of the hexagonal hole anode.

[0021] In this embodiment, the purpose of the above-mentioned setting is that after the positive electrode and the negative electrode are respectively connected to the contacts of the hexagonal hole anode and the circular hole cathode, the oil and gas exhaust gas passes through the anode and the cathode inside the equipment shell, and under the joint action of the electrolyte and the electrode particles, the organic matter in the oil and gas exhaust gas is oxidized and decomposed by the cathode and cathode.

[0022] Furthermore, the conical bottom of the device housing is provided with filling electrode particles for increasing the electrolytic oxidation area.

[0023] In this embodiment, the purpose of the above-mentioned setting is that the lower part of the device shell is a conical bucket, and the inside of the bucket is filled with electrode particles to improve conductivity and increase the electrolysis effect. Filling electrode particles can increase the electrolytic oxidation area, that is, increase the reaction area, reduce the spatial distance between the anode and cathode, and greatly improve the current efficiency and improve the oxidation of the equipment.

[0024] Furthermore, an oil and gas inlet is provided at the bottom of the cone filled with electrode particles, a first outlet is provided on the outer wall of the oil and gas storage tank, and the oil and gas inlet is connected to the first outlet through a pipeline.

[0025] In this embodiment, the purpose of the above setting is to maintain the oil and gas storage tank pressure at 0.10-0.2MPa and its temperature at -5--10℃ to provide power for subsequent equipment. The oil and gas pass through the pipeline and enter the interior of the equipment housing through the oil and gas inlet.

[0026] Furthermore, a first inlet is connected to the outer wall of the oil and gas storage tank, a second outlet is provided on the top of the boost concentrator, the first inlet is connected to the second outlet through a pipeline, a second inlet is provided at one end of the boost concentrator, and the second inlet is connected to the refrigerator through a pipeline.

[0027] In this embodiment, the purpose of the above arrangement is that the condensed oil and gas are pressurized through the booster concentrator, firstly to increase the tail gas concentration to 400-600 mg / m3 and above, and at the same time, the refrigerator in front is to reduce the oil and gas temperature, improve safety, and compress at low temperature to improve the contact effect in the later stage;

[0028] The second is to increase the exhaust gas pressure so that it can stir the electrode particles in the later stage and make it easier for the exhaust gas to pass through the electrode.

[0029] Furthermore, the material of the hexagonal hole anode is sintered tetratitanium heptoxide, the hexagonal hole anode adopts a hexagonal hole anode plate, and the circular hole cathode adopts a punching plate.

[0030] In this embodiment, the purpose of the above arrangement is that the distance between the particles of tetratitanium heptoxide TiO2 gradually decreases through diffusion, and the contact area of ​​the particle surface increases, which is beneficial to increase the contact area of ​​the reaction, thereby increasing the reaction rate. After the tetratitanium heptoxide is sintered, the material can be prevented from reacting with oxygen or moisture in the air.

[0031] The length of the hexagonal anode hexagon is controlled at 20-30 μm to prevent the filling electrode particles from passing through the anode hole;

[0032] The cathode of electrochemical oxidation decomposition adopts 316L punched plate, and the punched holes are required to be circular with a hole diameter of 2-3mm.

[0033] Furthermore, the outer wall of the filled electrode particles forms a flat oval shape.

[0034] In this embodiment, the purpose of the above setting is that the filling electrode particles are formed by rolling 316L powder with a rolling thickness of 100-200 μm, and the appearance of the filling electrode particles is flat oval, with a major axis length controlled at 2-3 mm and a minor axis length controlled at 0.5-1 mm.

[0035] The present invention has the following beneficial effects:

[0036] (1) The present invention sets up an electrochemical oxidation decomposer. When the electrochemical oxidation decomposer is in operation, the power is first turned on to make the electrode oxidative. The oil and gas storage tank flows into the low-temperature oil and gas compressed by the booster concentrator and enters the electrochemical oxidation decomposer at a pressure of 0.10-0.2MPa. At the same time, the electrode particles are suspended in the electrolyte to improve the conductivity and increase the electrolysis effect. The oil and gas exhaust passes through the circular hole cathode and the hexagonal hole anode in the electrochemical oxidation decomposer. Under the joint action of the electrolyte and the electrode particles, the anode and cathode oxidize and decompose the organic matter in the oil and gas exhaust.

[0037] (2) The present invention adopts the configuration of an electrochemical oxidation decomposer, which adopts an upper cylindrical and lower conical structure, and generally controls the volume ratio of the cylindrical and cone to be 4-5:1.

[0038] (3) The present invention adopts the electrochemical oxidation decomposer, which adopts low-temperature compression technology and controls the temperature at -10--15°C to increase the safety during the compression process.

[0039] (4) The present invention provides an oil and gas storage tank. After the booster concentrator compresses the gas, the pressure of the oil and gas storage tank is maintained at 0.10-0.2MPa and the temperature is maintained at -5-10°C to provide power for subsequent equipment.

[0040] (5) The present invention sets the filling electrode particles, which are formed by rolling 316L powder with a rolling thickness of 100-200 μm. The appearance of the filling electrode particles is flat oval, with a major axis length controlled at 2-3 mm and a minor axis length controlled at 0.5-1 mm.

[0041] (6) The present invention arranges the hexagonal anode of the electrochemical oxidation decomposer as a hexagonal anode plate, and the length of the hexagonal anode is controlled at 20-30 μm to prevent the electrode particles from passing through the anode hole.

[0042] (7) The present invention arranges the anode and cathode of the electrochemical oxidation decomposer. The anode of the electrochemical oxidation decomposer is sintered with tetratitanium heptoxide. The anode is a hexagonal hole anode plate. The length of the hexagon of the hexagonal hole anode is controlled to be 20-30 mm to prevent the filling electrode particles from passing through the anode hole. The cathode of the electrochemical oxidation decomposer adopts a 316L punched plate. The punched holes are circular and the hole diameter is 2-3 mm.

[0043] (8) The present invention is provided with an electrochemical oxidation decomposer, which uses a direct current power supply, the power supply is controlled at 10-12V, and the current is controlled at 800-1000A.

[0044] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0046] Figure 1 It is a schematic diagram of the structure of the electrochemical oxidation decomposer of the present invention;

[0047] Figure 2 This is a schematic diagram of the structure of the oil and gas storage tank of the present invention;

[0048] Figure 3 This is a schematic diagram of the structure of the booster concentrator of the present invention;

[0049] Figure 4 It is a schematic diagram of the structure of the refrigerator of the present invention;

[0050] Figure 5 It is a schematic diagram of the structure of the dehydrator of the present invention;

[0051] Figure 6 This is a schematic diagram of the hexagonal hole anode structure of the present invention;

[0052] Figure 7 This is a schematic diagram of the circular hole cathode structure of the present invention;

[0053] Figure 8 This is a schematic diagram of the structure of the electrode particles filled in the present invention;

[0054] Fig. 9 It is a schematic diagram of the system of the present invention;

[0055] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0056] In the figure: 1. Electrochemical oxidation decomposer; 101. Equipment shell; 102. Circular hole cathode; 103. Hexagonal hole anode; 104. Positive electrode; 105. Negative electrode; 106. Electrolyte; 107. Filling electrode particles; 108. Oil and gas inlet; 109. Standard discharge outlet; 2. Oil and gas storage tank; 201. First inlet; 202. First outlet; 3. Booster concentrator; 301. Second inlet; 302. Second outlet; 4. Refrigerator; 401. First liquid nitrogen inlet; 402. First nitrogen outlet; 5. Dehydrator; 501. Second liquid nitrogen inlet; 502. Second nitrogen outlet; 503. Drain outlet; 504. Air inlet. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] like Figure 1 - Fig. 9As shown, the present invention is a low-concentration oil and gas tail gas treatment device, comprising a refrigerator 4 and a dehydrator 5, the refrigerator 4 and the dehydrator 5 are connected to each other, a first liquid nitrogen inlet 401 and a first nitrogen outlet 402 are arranged on the outer wall of the refrigerator 4, a second liquid nitrogen inlet 501 and a second nitrogen outlet 502 are arranged on the outer wall of the dehydrator 5, a drain port 503 is arranged at the bottom of the dehydrator 5, and an air inlet 504 is arranged on the outer wall of the dehydrator 5;

[0059] The refrigerator 4 and the dehydrator 5 are respectively provided with regulating valves for adjusting the temperature;

[0060] The outer wall of the refrigerator 4 is connected to a booster concentrator 3, one end of the booster concentrator 3 is connected to an oil and gas storage tank 2, and the outer wall of the oil and gas storage tank 2 is connected to an electrochemical oxidation decomposer 1 for oil and gas tail gas treatment;

[0061] The electrochemical oxidation decomposer 1 includes an equipment shell 101, which adopts an upper cylindrical and lower conical structure, and the volume of the cylinder and the cone is 4-5:1. The interior of the equipment shell 101 is provided with a cathode and cathode structure, and the top of the equipment shell 101 is provided with a positive and negative electrode structure, and the cathode and cathode structures are connected with the positive and negative electrode structures. The top of the equipment shell 101 is provided with a standard discharge port 109, and the interior of the equipment shell 101 is provided with an electrolyte 106.

[0062] In this embodiment, the purpose of the above-mentioned setting is that the electrochemical oxidation decomposer 1 adopts a DC power supply, the power supply is controlled at 10-12V, the current is controlled at 800-1000A, and the low-concentration oil and gas first enters the dehydrator 5. The dehydrator 5 adopts liquid nitrogen as a cold source. The liquid nitrogen enters the interior of the dehydrator 5 from the second liquid nitrogen inlet 501, and then flows out from the second nitrogen outlet 502. The temperature of the dehydrator 5 is controlled by a regulating valve. Generally, the temperature of the dehydrator 5 is controlled at 0-3°C to remove the moisture in the oil and gas tail gas to prevent clogging of subsequent equipment.

[0063] The dehydrated tail gas enters the refrigerator 4. The refrigerator 4 uses liquid nitrogen as a cold source. The liquid nitrogen enters the refrigerator 4 from the first liquid nitrogen inlet 401 and then flows out from the first nitrogen outlet 402. The refrigerator 4 controls the temperature of the refrigerator through a regulating valve. Generally, the temperature of the refrigerator 4 is controlled at -10--15°C. The function of the refrigerator 4 is to reduce the oil and gas temperature, improve the safety of the later compression, and prevent the oil and gas from spontaneous combustion. The oil and gas tail gas after dehydration and refrigeration and cooling enters the booster concentrator 3 for compression. The oil and gas compression has two main functions:

[0064] First, the exhaust concentration is increased to 400-600 mg / m3 and above. At the same time, the refrigerator 4 in front is to reduce the oil and gas temperature, improve safety, and compress at low temperature to improve the contact effect in the later stage;

[0065] The second is to increase the tail gas pressure so as to stir the electrode particles 107 in the later stage, and the tail gas can pass through the electrode more easily;

[0066] The oil and gas tail gas after passing through the booster concentrator 3 enters the oil and gas storage tank 2, maintaining a pressure of 0.10-0.2MPa;

[0067] The anode and cathode structures and the positive and negative electrode structures provided on the equipment housing 101 are connected, and the positive and negative electrode structures are energized. The anode and cathode structures cooperate with the electrolyte 106 to oxidize and decompose the organic matter in the oil and gas exhaust. 50% of the interior of the equipment housing 101 is the electrolyte 106, which is decomposed into carbon dioxide and water. The exhaust gas that meets the oxidation standards is discharged from the qualified exhaust port 109 of the equipment housing 101.

[0068] As an implementation method, Figure 1 As shown, further:

[0069] The cathode and cathode structure include a hexagonal hole anode 103 and a circular hole cathode 102. The two circular hole cathodes 102 are respectively arranged at the two ends of the bottom of the device housing 101. The two circular hole cathodes 102 penetrate and extend to the outside of the device housing 101.

[0070] The hexagonal hole anode 103 forms a U-shaped structure, with two ends thereof respectively disposed at two ends of the bottom of the device housing 101 , and the top of the hexagonal hole anode 103 penetrates and extends to the outside of the device housing 101 .

[0071] In this embodiment, the purpose of the above arrangement is that the top of the device housing 101 is the connection point of the hexagonal hole anode 103 and the round hole cathode 102, which are used to connect with the positive electrode 104 and the negative electrode 105 respectively.

[0072] As an implementation method, Figure 1 As shown, further:

[0073] The positive and negative electrode structure includes a positive electrode 104 and a negative electrode 105 . Two ends of the negative electrode 105 are respectively connected to two ends of the circular hole cathode 102 , and one end of the positive electrode 104 is connected to the top of the hexagonal hole anode 103 .

[0074] In this embodiment, the purpose of the above-mentioned setting is that after the positive electrode 104 and the negative electrode 105 are respectively connected to the contacts of the hexagonal hole anode 103 and the circular hole cathode 102, the oil and gas exhaust passes through the anode and the cathode inside the equipment housing 101, and under the joint action of the electrolyte 106 and the electrode particles, the organic matter in the oil and gas exhaust is oxidized and decomposed by the cathode and cathode.

[0075] As an implementation method, Figure 1 As shown, further:

[0076] The conical bottom of the device housing 101 is provided with filled electrode particles 107 for increasing the electrolytic oxidation area.

[0077] In this embodiment, the purpose of the above-mentioned arrangement is that the lower part of the device housing 101 is a conical bucket, and the inside of the bucket is filled with electrode particles 107 to improve conductivity and increase the electrolysis effect. Filling the electrode particles 107 can increase the electrolytic oxidation area, that is, increase the reaction area, reduce the spatial distance between the anode and cathode, and greatly improve the current efficiency and improve the oxidation of the device.

[0078] As an implementation method, Figure 2 As shown, further:

[0079] An oil and gas inlet 108 is provided at the bottom of the cone filled with electrode particles 107 , and a first outlet 202 is provided on the outer wall of the oil and gas storage tank 2 . The oil and gas inlet 108 is connected to the first outlet 202 through a pipeline.

[0080] In this embodiment, the purpose of the above setting is that the oil and gas storage tank 2 maintains a pressure of 0.10-0.2MPa and a temperature of -5--10℃ to provide power for subsequent equipment. The oil and gas pass through the pipeline and enter the interior of the equipment housing 101 through the oil and gas inlet 108.

[0081] As an implementation method, Figure 2 As shown, further:

[0082] A first inlet 201 is connected to the outer wall of the oil and gas storage tank 2, a second outlet 302 is arranged on the top of the boost concentrator 3, the first inlet 201 is connected to the second outlet 302 through a pipeline, a second inlet 301 is arranged at one end of the boost concentrator 3, and the second inlet 301 is connected to the refrigerator 4 through a pipeline.

[0083] In this embodiment, the purpose of the above arrangement is that the condensed oil and gas are pressurized by the booster concentrator 3, firstly to increase the tail gas concentration to 400-600 mg / m3 and above, and at the same time, the refrigerator 4 in front is to reduce the oil and gas temperature, improve safety, and compress at low temperature to improve the contact effect in the later stage;

[0084] The second is to increase the tail gas pressure so as to stir the electrode particles 107 in the later stage, so that the tail gas can pass through the electrode more easily.

[0085] As an implementation method, Figure 6 - Figure 7 As shown, further:

[0086] The material of the hexagonal hole anode 103 is sintered tetratitanium heptoxide, the hexagonal hole anode 103 adopts a hexagonal hole anode plate, and the circular hole cathode 102 adopts a punching plate.

[0087] In this embodiment, the purpose of the above arrangement is that the distance between the particles of tetratitanium heptoxide TiO2 gradually decreases through diffusion, and the contact area of ​​the particle surface increases, which is beneficial to increase the contact area of ​​the reaction, thereby increasing the reaction rate. After the tetratitanium heptoxide is sintered, the material can be prevented from reacting with oxygen or moisture in the air.

[0088] like Figure 6 , the length of the hexagon of the hexagonal hole anode 103 is controlled to be 20-30 μm to prevent the filled electrode particles 107 from passing through the anode hole;

[0089] The cathode of electrochemical oxidation decomposition 1 uses 316L punched plate, and the punched holes are required to be circular. Figure 7 , hole diameter 2-3mm.

[0090] As an implementation method, Figure 7 As shown, further:

[0091] The outer wall of the filled electrode particles 107 forms a flat oval shape.

[0092] In this embodiment, the purpose of the above setting is that the filling electrode particles 107 are formed by rolling 316L powder with a rolling thickness of 100-200 μm. The filling electrode particles 107 are flat oval in appearance, with a major axis length controlled at 2-3 mm and a minor axis length controlled at 0.5-1 mm.

[0093] When in use, the electrochemical oxidation decomposer 1 adopts a DC power supply, the power supply is controlled at 10-12V, and the current is controlled at 800-1000A. The low-concentration oil and gas first enters the dehydrator 5. The dehydrator 5 adopts liquid nitrogen as a cold source. The liquid nitrogen enters the interior of the dehydrator 5 from the second liquid nitrogen inlet 501. The temperature of the dehydrator is controlled by a regulating valve. Generally, the temperature of the dehydrator is controlled at 0-3°C to remove moisture from the oil and gas tail gas to prevent clogging of subsequent equipment.

[0094] The dehydrated tail gas enters the refrigerator 4, and the refrigerator 4 controls the temperature of the refrigerator 4 through the regulating valve. Generally, the temperature of the refrigerator is controlled at -10--15℃. The function of the refrigerator 4 is to reduce the temperature of the oil and gas, improve the safety of the later compression, and prevent the spontaneous combustion of the oil and gas. The oil and gas tail gas after dehydration and refrigeration and cooling enters the booster concentrator 3 for compression. The oil and gas compression has two main functions:

[0095] First, the exhaust concentration is increased to 400-600 mg / m3 and above. At the same time, the refrigerator 4 in front is to reduce the oil and gas temperature, improve safety, and compress at low temperature to improve the contact effect in the later stage;

[0096] The second is to increase the tail gas pressure so as to stir the electrode particles 107 in the later stage, and the tail gas can pass through the electrode more easily;

[0097] The oil and gas tail gas after passing through the booster concentrator 3 enters the oil and gas storage tank 2, maintaining a pressure of 0.10-0.2MPa;

[0098] The anode and cathode structures and the positive and negative electrode structures provided on the equipment housing 101 are connected, and the positive and negative electrode structures are energized. The anode and cathode structures cooperate with the electrolyte 106 to oxidize and decompose the organic matter in the oil and gas exhaust. 50% of the interior of the equipment housing 101 is the electrolyte 106, which is decomposed into carbon dioxide and water. The exhaust gas that meets the oxidation standards is discharged from the qualified exhaust port 109 of the equipment housing 101.

[0099] During this process, when the electrochemical oxidation decomposer 1 is in operation, the power supply is first turned on to make the electrode oxidizing. The low-temperature oil and gas compressed by the booster concentrator 3 flows into the oil and gas storage tank 2 and enters the electrochemical oxidation decomposer 1 at a pressure of 0.10-0.2MPa. At the same time, the filled electrode particles 107 are suspended in the electrolyte 106 to improve the conductivity and increase the electrolysis effect. The oil and gas exhaust passes through the circular hole cathode 102 and the hexagonal hole anode 103 in the electrochemical oxidation decomposer 1. Under the joint action of the electrolyte 106 and the filled electrode particles 107, the anode and cathode oxidize and decompose the organic matter in the oil and gas exhaust.

[0100] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A low-concentration oil and gas tail gas treatment device, comprising a refrigerator (4) and a dehydrator (5), characterized in that: The refrigerator (4) and the dehydrator (5) are in communication with each other; a first liquid nitrogen inlet (401) and a first nitrogen outlet (402) are provided on the outer wall of the refrigerator (4); a second liquid nitrogen inlet (501) and a second nitrogen outlet (502) are provided on the outer wall of the dehydrator (5); a drain outlet (503) is provided at the bottom of the dehydrator (5); and an air inlet (504) is provided on the outer wall of the dehydrator (5); The refrigerator (4) and the dehydrator (5) are respectively provided with regulating valves for regulating the temperature; The outer wall of the refrigerator (4) is connected to a booster concentrator (3), one end of the booster concentrator (3) is connected to an oil and gas storage tank (2), and the outer wall of the oil and gas storage tank (2) is connected to an electrochemical oxidation decomposer (1) for treating oil and gas tail gas; The electrochemical oxidation decomposer (1) comprises a device housing (101), wherein the device housing (101) adopts an upper cylindrical and lower conical structure, wherein the volume ratio of the cylindrical to the conical structure is 4-5:1, wherein a cathode and cathode structure is arranged inside the device housing (101), wherein a positive and negative electrode structure is arranged on the top of the device housing (101), wherein the cathode and cathode structures are connected to the positive and negative electrode structures, wherein a qualified discharge port (109) is arranged on the top of the device housing (101), and wherein an electrolyte (106) is arranged inside the device housing (101); The outer wall of the oil and gas storage tank (2) is connected to a first inlet (201), the top of the booster concentrator (3) is provided with a second outlet (302), the first inlet (201) is connected to the second outlet (302) via a pipeline, one end of the booster concentrator (3) is provided with a second inlet (301), and the second inlet (301) is connected to a refrigerator (4) via a pipeline.

2. A low-concentration oil and gas tail gas treatment device according to claim 1, characterized in that: The cathode and cathode structures comprise a hexagonal hole anode (103) and a circular hole cathode (102), wherein the two circular hole cathodes (102) are respectively arranged at two ends of the bottom of the device housing (101), and the two circular hole cathodes (102) penetrate and extend to the outside of the device housing (101); The hexagonal hole anode (103) forms a U-shaped structure, with two ends thereof respectively arranged at two ends of the bottom of the device housing (101), and the top of the hexagonal hole anode (103) penetrates and extends to the outside of the device housing (101).

3. A low-concentration oil and gas tail gas treatment device according to claim 2, characterized in that: The positive and negative electrode structure comprises a positive electrode (104) and a negative electrode (105), two ends of the negative electrode (105) are respectively connected to two ends of a circular hole cathode (102), and one end of the positive electrode (104) is connected to the top of a hexagonal hole anode (103).

4. A low-concentration oil and gas tail gas treatment device according to claim 3, characterized in that: The conical bottom of the device housing (101) is provided with filling electrode particles (107) for increasing the electrolytic oxidation area.

5. A low-concentration oil and gas tail gas treatment device according to claim 4, characterized in that: An oil and gas inlet (108) is provided at the bottom of the cone filled with electrode particles (107), a first outlet (202) is provided on the outer wall of the oil and gas storage tank (2), and the oil and gas inlet (108) is connected to the first outlet (202) through a pipeline.

6. A low-concentration oil and gas tail gas treatment device according to claim 5, characterized in that: The material of the hexagonal hole anode (103) is sintered tetratitanium heptoxide, the hexagonal hole anode (103) adopts a hexagonal hole anode plate, and the circular hole cathode (102) adopts a punching plate.

7. A low-concentration oil and gas tail gas treatment device according to claim 6, characterized in that: The outer wall of the filled electrode particles (107) forms a flat oval shape.

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