A kind of equipment for purifying and recovering waste gas from petroleum refining

Abstract

The present invention relates to the technical field of waste gas treatment, and specifically to a petroleum refining waste gas purification and recovery equipment, including a condensate recovery tank, a condensate storage tank and a spray tower, wherein the upper end of the condensate recovery tank is provided with an exhaust pipe, the lower part is provided with an air intake pipe connected to the exhaust port of the acidic water tank, and the air intake pipe is provided with a check valve; a cooling coil is provided in the lower part of the condensate recovery tank, water is contained in the condensate recovery tank, an oil-water separation mechanism located above the cooling coil is provided in the condensate recovery tank, the oil-water separation mechanism is located at the liquid surface of the water, a drain pipe is provided at the lower end of the oil-water separation mechanism, the drain pipe penetrates the side wall of the condensate recovery tank and is connected to the condensate storage tank, and a return pipe connected to the exhaust pipe is provided at the upper end of the condensate storage tank; the other end of the exhaust pipe is connected to the spray tower. The present invention can treat the volatile waste gas in the acidic water tank area, purify, separate and recover the volatile petroleum gas components in the waste gas, reduce environmental pollution and recover petroleum resources.

Description

Technical Field

[0001] The invention relates to the technical field of waste gas treatment, and in particular to a petroleum refining waste gas purification and recovery device. Background Art

[0002] Pollutants in petroleum refining waste gas include hydrogen sulfide, organic sulfides, hydrocarbons, etc. Organized waste gas emissions during the petroleum refining process can usually be effectively treated, but unorganized waste gas emissions cannot be effectively treated because of their irregular emission time and emission volume. Among them, the acidic water tanks and oil intermediate tank areas have larger emissions and more serious pollution.

[0003] Acidic water tank areas and intermediate oil tank areas are a type of complex pollution and malodorous gas emission sources in petroleum refining enterprises. Their unorganized emissions of waste gas are mainly total hydrocarbons and hydrogen sulfide. Among them, total hydrocarbon substances are all volatile organic compounds. The main characteristics of this type of substance are high evaporation rate at room temperature and easy volatility. They are high-concentration toxic and harmful gases, which cause serious pollution to the anaerobic environment. Therefore, both at home and abroad, great attention is paid to the reduction and control of waste gas pollutants in acidic water tank areas.

[0004] In the existing technology, emission reduction treatment at this point is usually carried out by establishing interconnected pipelines of multiple acidic water tanks (according to data reports, emissions can be reduced by about 17%), or by removing hydrogen sulfide through alkaline solution spraying and then connecting the exhaust gas combustion pipeline for mixed combustion.

[0005] This leads to waste of volatile gases in the acidic water tank area, resulting in a large amount of waste of petroleum resources every year. The combustion of sulfur-containing substances also produces sulfur dioxide, which pollutes the environment. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a petroleum refining waste gas purification and recovery equipment, which can treat the volatile waste gas in the acidic water tank area, purify, separate and recover the components in the volatile gas, reduce environmental pollution and recover petroleum resources; another purpose of the present invention is to minimize the energy consumption of waste gas treatment.

[0007] The technical solution adopted in this application to solve this technical problem is:

[0008] A petroleum refining waste gas purification and recovery equipment comprises a condensate recovery tank, a condensate storage tank and a spray tower, wherein the upper end of the condensate recovery tank is provided with an exhaust pipe, the lower part is provided with an air intake pipe connected to the exhaust port of an acidic water tank, and the air intake pipe is provided with a check valve; a cooling coil is provided in the lower part of the condensate recovery tank, water is contained in the condensate recovery tank, an oil-water separation mechanism located above the cooling coil is provided in the condensate recovery tank, the oil-water separation mechanism uses the different densities of oil and water to separate oil and water, the liquid level of water is located in the middle of the oil-water separation mechanism, a drain pipe is provided at the lower end of the oil-water separation mechanism, the drain pipe passes through the side wall of the condensate recovery tank and is connected to the condensate storage tank, and a return pipe connected to the exhaust pipe is provided at the upper end of the condensate storage tank; the other end of the exhaust pipe is connected to the spray tower.

[0009] Furthermore, the oil-water separation mechanism includes a recovery cylinder and a separation head. The recovery cylinder is in the upper part of the condensation recovery tank, and a plurality of separation heads are evenly distributed on the outer circumference of the recovery cylinder. The separation head includes a connecting pipe and a separation pipe. One end of the connecting pipe is connected to the recovery cylinder, and the other end is connected to the separation pipe in a vertical state. The inner diameter of the separation pipe is larger than the inner diameter of the connecting pipe. A separation ball is arranged in the separation pipe. The diameter of the separation ball is larger than the inner diameter of the connecting pipe and smaller than the inner diameter of the separation pipe. The apparent density of the separation ball is 9.6-9.8g / cm³. A limiter is arranged at the lower end of the separation pipe to prevent the separation ball from falling.

[0010] Furthermore, a liquid level stabilizing mechanism is provided outside the oil-water separation mechanism, and the liquid level stabilizing mechanism includes a baffle ring and a filter cylinder. The baffle ring is a horizontally arranged annular plate body, the inner edge of the baffle ring is connected to the lower end outer wall of the recovery cylinder, and the outer edge of the baffle ring is connected to the filter cylinder, and the filter cylinder is surrounded outside the recovery cylinder.

[0011] Furthermore, the mesh size of the filter cartridge is 40-100 mesh.

[0012] Furthermore, a gas distributor is provided below the cooling coil, and the gas distributor includes a fixed plate and a breathable cone tube, the fixed plate is connected to the inner wall of the condensation recovery tank, and breathable holes are evenly distributed on the fixed plate, and each of the breathable holes is connected to a breathable cone tube located above the fixed plate.

[0013] Furthermore, a drain pipe is provided at the lower portion of the condensate recovery tank, and a discharge pipe is connected to the lower end and the middle portion of the condensate storage tank.

[0014] Furthermore, the liquid sprayed by the spray tower is an aqueous solution of sodium carbonate.

[0015] Furthermore, it also includes a compression recovery module, which includes a buffer tank, an ultra-high pressure gas compressor and a separation tank connected in sequence. The buffer tank is a cylindrical tank body. A guide rod is provided in the buffer tank, and a piston disk is slidably connected to the guide rod. The piston disk is in sliding contact with the inner wall of the buffer tank. The buffer tank is connected to the air outlet at the upper end of the spray tower through the air pipe below the piston disk. A displacement sensor is provided at the top of the buffer tank. The displacement sensor detects the distance between the piston disk and the top of the buffer tank, and starts or stops the ultra-high pressure gas compressor and the spray tower according to the distance. The air outlet of the ultra-high pressure gas compressor is connected to the separation tank, and the external exhaust pipeline at the bottom of the spray tower is higher than the connection between the exhaust pipe and the spray tower.

[0016] Furthermore, the separation tank is a closed tank body, a hydrocarbon exhaust pipeline is provided at the lower end of the separation tank, and an exhaust gas emission pipeline is connected to the upper end of the separation tank. A pressure limiting valve is provided on the exhaust gas emission pipeline, and the minimum value of the pressure limiting valve is 9MPa.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention can utilize limited water to condense and recover waste gas, and directly obtain oil resources after separation by the oil-water separation mechanism. The water vapor in the acidic water tank replenishes the separation agent, and there is no need for external circulation of the separation agent, thereby reducing energy consumption; 2. The present invention can purify and recover different components in different ways, effectively recover oil resources, and according to the production scale of the oil refinery, recover oil and gas resources each year, which can reduce hundreds of tons of oil and gas emissions; 3. The present invention can achieve matching of the start and stop of the treatment equipment with the unorganized waste gas emissions, increase the operating time when the waste gas flow is large, and stop the equipment when the waste gas stops being discharged, thereby saving energy consumption for waste gas treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention;

[0019] Figure 2 is a sectional front view of the first embodiment of the present invention;

[0020] Figure 3 It is a schematic structural diagram of the separation head of the present invention;

[0021] Figure 4 is a sectional front view of the separation head of the present invention;

[0022] Figure 5 is a structural diagram of Embodiment 2 of the present invention;

[0023] Figure 6 It is a sectional front view of the second embodiment of the present invention.

[0024] The numbers in the attached drawings are: 1, condensate recovery tank; 2, condensate storage tank; 3, spray tower; 4, exhaust pipe; 5, air inlet pipe; 6, check valve; 7, cooling coil; 8, oil-water separation mechanism; 9, drain pipe; 10, return air pipe; 11, recovery cylinder; 12, separation head; 13, connecting pipe; 14, separation pipe; 15, separation ball; 16, limiter; 17, liquid level stabilization mechanism; 18, retaining ring; 19, filter cartridge; 20 , gas distributor; 21. fixed plate; 22. breathable cone; 23. drain pipe; 24. discharge pipe; 25. liquid level gauge; 26. compression recovery module; 27. buffer tank; 28. ultra-high pressure gas compressor; 29. ​​separation tank; 30. guide rod; 31. piston plate; 32. gas transmission pipe; 33. displacement sensor; 34. tower bottom external discharge pipeline; 35. hydrocarbon discharge pipeline; 36. exhaust gas discharge pipeline; 37. pressure limiting valve. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0026] Malodorous pollutants in petroleum refining include hydrogen sulfide, organic sulfides, hydrocarbons, etc. Organized exhaust gas emissions during the petroleum refining process can usually be effectively treated, but unorganized exhaust gas emissions cannot be effectively treated because of their irregular emission time and emission volume. Among them, the acidic water tanks and oil intermediate tank areas have larger emissions and more serious pollution. Their unorganized emissions are mainly caused by large and small breathing, which are strongly affected by seasons and temperatures. The emissions are irregular and cannot be effectively recovered and treated, but their pollution is relatively serious.

[0027] Table 1: Main components of waste gas from the acidic water tank area and the oil intermediate tank area (mixed sampling from the blending pipeline)

[0028]

[0029] These waste gases are too highly concentrated and toxic to be discharged directly into the atmosphere. They are usually connected to combustion pipelines for co-incineration. However, in addition to hydrogen sulfide, there are also some sulfur-containing organic matter that cannot be washed with alkaline solution. After co-incineration, sulfur dioxide is produced, which also causes pollution.

[0030] Embodiment 1: Figure 1 and Figure 2As shown, the present invention provides a petroleum refining waste gas purification and recovery equipment, including a condensate recovery tank 1, a condensate storage tank 2 and a spray tower 3, the upper end of the condensate recovery tank 1 is provided with an exhaust pipe 4, the lower part is provided with an air intake pipe 5 connected to the exhaust port of the acid water tank, and a check valve 6 is provided on the air intake pipe 5; a cooling coil 7 is provided in the lower part of the condensate recovery tank 1, and a coolant flows in the cooling coil 7 to cool the water in the condensate recovery tank 1 to 0-5°C, the condensate recovery tank 1 is filled with water, and the condensate recovery tank 1 is provided with an oil-water separation mechanism 8 located above the cooling coil 7, the oil-water separation mechanism 8 uses the different densities of oil and water to separate oil and water, the oil-water separation mechanism 8 is located at the liquid surface of the water, and the liquid surface of the water is located in the middle of the oil-water separation mechanism 8, the lower end of the oil-water separation mechanism 8 is provided with a drain pipe 9, the drain pipe 9 passes through the side wall of the condensate recovery tank 1 and is connected to the condensate storage tank 2, and the upper end of the condensate storage tank 2 is provided with a return pipe 10 connected to the exhaust pipe 4; the other end of the exhaust pipe 4 is connected to the spray tower 3.

[0031] The present invention utilizes the condensation recovery tank 1 for condensation recovery, but the present invention does not recover all components in the exhaust gas, but only recovers components with a higher boiling point (≥0°C) for condensation recovery. This part usually has a higher boiling point and is easy to condense, which can reduce the energy consumption of equipment operation, and also removes most of the organic matter containing sulfur except hydrogen sulfide, reducing the consumption of alkali solution during the later spraying. In addition to recovering most of the petroleum resources, no sulfur dioxide pollution is generated even if co-firing is carried out.

[0032] In addition, the present invention separates the components with higher boiling points by the oil-water separation mechanism 8, without external circulation of the separation agent (water) and without additional treatment to obtain the separated components, thereby further reducing the energy consumption of the equipment operation.

[0033] like Figure 3 and Figure 4 As shown, the oil-water separation mechanism 8 includes a recovery cylinder 11 and a separation head 12. The recovery cylinder 11 is in the upper part of the condensation recovery tank 1. A plurality of separation heads 12 are evenly distributed on the periphery of the recovery cylinder 11. The separation head 12 includes a connecting pipe 13 and a separation pipe 14. One end of the connecting pipe 13 is connected to the recovery cylinder 11, and the other end is connected to the separation pipe 14 in a vertical state. The inner diameter of the separation pipe 14 is larger than the inner diameter of the connecting pipe 13. A separation ball 15 is arranged in the separation pipe 14. The diameter of the separation ball 15 is larger than the inner diameter of the connecting pipe 13 and smaller than the inner diameter of the separation pipe 14. The apparent density of the separation ball 15 is 9.6-9.8 g / cm³. A stopper 16 is arranged at the lower end of the separation pipe 14 to prevent the separation ball 15 from falling.

[0034] The present invention utilizes buoyancy to separate oil and water to achieve the effect of automatic separation. The main components of the waste gas in the acidic water tank area and the oil intermediate tank area have densities less than water. Among them, the C8 hydrocarbons and mercaptans have the highest density, with a density of 0.82-0.86g / cm³, floating on the water surface, and the apparent density of the separation ball 15 of the present invention is 9.6-9.8g / cm³, located on the oil-water interface, that is, the separation ball 15 of the present invention allows condensed oil to pass through the separation head 12, and when water enters the separation head 12, it is blocked at the lower end of the connecting pipe 13 due to buoyancy, and a large amount of water is not allowed to pass through (a small amount of water will pass through) the two discharge pipes 24 on the condensate storage tank 2 for separate discharge. Because there are multiple separation heads 12, as long as the water level is between the lower end and the upper end of the recovery cylinder 11, oil-water separation can be achieved without additional control and energy consumption.

[0035] A liquid level stabilizing mechanism 17 is provided outside the oil-water separation mechanism 8. The liquid level stabilizing mechanism 17 includes a baffle ring 18 and a filter cartridge 19. The baffle ring 18 is a horizontally arranged annular plate. The inner edge of the baffle ring 18 is connected to the outer wall of the lower end of the recovery cartridge 11. The outer edge of the baffle ring 18 is connected to the filter cartridge 19. The filter cartridge 19 is surrounded outside the recovery cartridge 11.

[0036] The liquid level stabilizing mechanism 17 can limit the fluctuation of the liquid level, make the oil-water separation more stable, and reduce the water content in the oil component after separation.

[0037] The mesh size of the filter cartridge 19 is 40-100 meshes.

[0038] A gas distributor 20 is provided below the cooling coil 7, and the gas distributor 20 includes a fixed disk 21 and a breathable cone 22. The fixed disk 21 is connected to the inner wall of the condensation recovery tank 1, and breathable holes are evenly distributed on the fixed disk 21. Each breathable hole is connected to a breathable cone 22 located above the fixed disk 21.

[0039] The gas distributor 20 can distribute the gas so that the gas rises evenly in the water, thereby increasing the contact time and contact area between the exhaust gas and the water and increasing the condensation effect.

[0040] The inlet water temperature of the acidic water tank area is 50-60°C. In addition to the volatilization of the exhaust gas, water vapor is also generated, resulting in more and more water in the condensate recovery tank 1. A drain pipe 23 is provided at the lower part of the condensate recovery tank 1, and a discharge pipe 24 is connected to the lower end and the middle part of the condensate storage tank 2.

[0041] A liquid level gauge 25 is provided on the condensation recovery tank 1, through which the water level can be seen. When there is a lot of water, it is discharged through the drain pipe 23.

[0042] The liquid sprayed by the spray tower 3 is an aqueous solution of sodium carbonate.

[0043] Example 2: Usually, after most of the organic matter is recovered, other components no longer affect the co-combustion state, but there are still many alkanes and olefins with a freezing point below 0°C, which still need to be recovered.

[0044] like Figure 5 and Figure 6 As shown, on the basis of the first embodiment, the present embodiment adds a compression recovery module 26, the compression recovery module 26 comprises a buffer tank 27, an ultra-high pressure gas compressor 28 and a separation tank 29 which are connected in sequence, the buffer tank 27 is a cylindrical tank body, a guide rod 30 is arranged in the buffer tank 27, a piston disc 31 is slidably connected to the guide rod 30, the piston disc 31 is in sliding contact with the inner wall of the buffer tank 27, the buffer tank 27 is connected to the gas outlet at the upper end of the spray tower 3 through the gas pipeline 32 below the piston disc 31, and the gas inside the buffer tank 27 between the piston disc 31 and the gas pipeline 32 is There is a mechanism on the wall to limit the piston disc 31, which is a flange or a protrusion. Its function is to prevent the piston disc 31 from falling below the upper end of the gas pipe 32. A displacement sensor 33 is provided at the top of the buffer tank 27. The displacement sensor 33 detects the distance between the piston disc 31 and the top of the buffer tank 27, and according to the size of the distance, the ultra-high pressure gas compressor 28 and the spray tower 3 are started or stopped. The outlet of the ultra-high pressure gas compressor 28 is connected to the separation tank 29, and the bottom external exhaust pipeline 34 of the spray tower 3 is higher than the connection between the exhaust pipe 4 and the spray tower 3.

[0045] The present invention utilizes an ultra-high pressure gas compressor 28 to compress the waste gas. Due to the pressure, alkanes and olefins can be liquefied and thus separated from the waste gas to achieve resource recovery. In particular, the present invention further provides a separation tank 29 for separating liquefied petroleum gas, and utilizes a displacement sensor 33 to realize the start and stop of the ultra-high pressure gas compressor 28 and the spray tower 3, that is, the present invention can realize automatic control according to the exhaust of the storage tank. When the piston disk 31 rises to a distance close to the displacement sensor 33, the displacement sensor 33 provides an electrical signal to the controller to start the ultra-high pressure gas compressor 28. When the piston disk 31 drops to a distance far from the displacement sensor 33, the displacement sensor 33 provides an electrical signal to the controller to stop the ultra-high pressure gas compressor 28. This control circuit is a basic electrical circuit, and ordinary electricians can master this technique proficiently. It will not be repeated here. The waste gas treatment is coordinated with the state of unorganized exhaust to avoid the state of equipment running all the time, thereby achieving cost reduction and efficiency improvement.

[0046] The gravity of the piston disc 31 is m, the projected area of ​​the piston disc 31 on the horizontal plane is s, the ratio of m to s is 0.3-0.5, and the unit is MPa; the gravity and projected area ratio of the piston disc 31 is the gas pressure in the buffer tank 27, and the gravity and projected area ratio of the piston disc 31 reaches 0.3-0.5, which is enough to keep the condensate recovery tank 1, the condensate storage tank 2 and the spray tower 3 at a relatively high pressure, which is beneficial to the condensation of hydrocarbons in the exhaust gas, and is also beneficial to compressing the gas, reducing the starting frequency of the ultra-high pressure gas compressor 28, and helping to extend the service life of the equipment.

[0047] This setting not only increases the weight of the piston disc 31 and makes its up and down movement more stable, but also increases the pressure in the condensation recovery tank 1 to increase the condensation effect. The air intake of the ultra-high pressure gas compressor 28 is also 0.3-0.5MPa, which can reduce the energy consumption of the ultra-high pressure gas compressor 28.

[0048] The separation tank 29 is a sealed tank body, and a hydrocarbon discharge pipeline 35 is provided at the lower end of the separation tank 29. The upper end of the separation tank 29 is connected to the exhaust gas discharge pipeline 36. A pressure limiting valve 37 is provided on the exhaust gas discharge pipeline 36. The minimum value of the pressure limiting valve 37 is 9MPa; 9MPa is the pressure at which the main components of the exhaust gas from the above-mentioned acidic water tank area and the oil intermediate tank area are liquefied. Under this pressure at normal temperature, except for some methane that cannot be liquefied, other components can be pressurized and liquefied. The liquefied components remain in the separation tank 29, and the parts that cannot be liquefied are discharged through the exhaust gas discharge pipeline 36.

[0049] The operating principle of the present invention is as follows: the air inlet pipe 5 is directly connected to the exhaust port of the acidic water tank. When the acidic water tank breathes (due to temperature changes or changes in the acidic water liquid level), the acidic water tank does not pass through the air inlet pipe 5 when it inhales air because of the check valve 6. When the acidic water tank exhausts air, the exhaust gas passes through the air inlet pipe 5. At this time, the exhaust gas passes through the gas distributor 20 for uniform bubbling. The exhaust gas is fully in contact with water. The cooling coil 7 keeps the water at a low temperature. After the exhaust gas is heat-exchanged with low-temperature water, it condenses into a liquid oil layer and floats on the water surface. As the thickness of the oil layer increases, when the upper surface of the liquid oil layer exceeds the separation head 12, it enters the recovery cylinder 11 and is then transported to the condensate storage tank 2 through the drain pipe 9. In this process, it is inevitable that a small amount of water enters the condensate storage tank 2. The return air pipe at the upper end of the condensate storage tank 2 10 is used to stabilize the air pressure so that the oil can smoothly enter the condensate storage tank 2. The condensate storage tank 2 still has oil and water layers, wherein the lower layer of water is discharged through the discharge pipe 24 at the lower end of the condensate storage tank 2, and the upper layer of oil is extracted through the discharge pipe 24 in the middle of the condensate storage tank 2; the waste gas that has not condensed in the condensate recovery tank 1 enters the spray tower 3 through the exhaust pipe 4, which mainly contains hydrogen sulfide and hydrocarbons that are gaseous at room temperature (such as methane, ethylene, etc.). The spray tower 3 sprays an aqueous solution of sodium carbonate to absorb hydrogen sulfide. The remaining waste gas is compressed by the ultra-high pressure gas compressor 28, and olefins and part of the alkanes are liquefied and left in the separation tank 29. Other non-condensable gases no longer contain hazardous substances, and the alkane concentration is lower than the technical emission standard. They are discharged from the waste gas emission pipeline 36 or connected to the gas pipeline network for mixed combustion.

[0050] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

Claims

1. A petroleum refining waste gas purification and recovery equipment, characterized in that: The invention comprises a condensate recovery tank (1), a condensate storage tank (2) and a spray tower (3), wherein the upper end of the condensate recovery tank (1) is provided with an exhaust pipe (4), and the lower part is provided with an air intake pipe (5) connected to the exhaust port of the acid water tank, and the air intake pipe (5) is provided with a check valve (6); a cooling coil (7) is provided in the lower part of the condensate recovery tank (1), and the condensate recovery tank (1) is filled with water; an oil-water separation mechanism (8) is provided in the condensate recovery tank (1) and is located above the cooling coil (7); the oil-water separation mechanism (8) separates oil and water by utilizing the different densities of oil and water, and the liquid level of water is located in the middle of the oil-water separation mechanism (8); a drain pipe (9) is provided at the lower end of the oil-water separation mechanism (8), and the drain pipe (9) passes through the side wall of the condensate recovery tank (1) and is connected to the condensate storage tank (2); a return pipe (10) connected to the exhaust pipe (4) is provided at the upper end of the condensate storage tank (2); the other end of the exhaust pipe (4) is connected to the spray tower (3); The oil-water separation mechanism (8) comprises a recovery cylinder (11) and a separation head (12), wherein the recovery cylinder (11) is located in the upper part of the condensation recovery tank (1), and a plurality of separation heads (12) are evenly distributed on the outer periphery of the recovery cylinder (11), and the separation head (12) comprises a connecting tube (13) and a separation tube (14), wherein one end of the connecting tube (13) is connected to the recovery cylinder (11), and the other end is connected to the separation tube (14) which is in a vertical state, wherein the inner diameter of the separation tube (14) is larger than the inner diameter of the connecting tube (13), and a separation ball (15) is arranged in the separation tube (14), wherein the diameter of the separation ball (15) is larger than the inner diameter of the connecting tube (13) and smaller than the inner diameter of the separation tube (14), and the apparent density of the separation ball (15) is 9.6-9.8 g / cm³, and a stopper (16) is arranged at the lower end of the separation tube (14) to prevent the separation ball (15) from falling; The separation ball (15) allows condensed oil to pass through the separation head (12), and when water enters the separation head (12), it is blocked at the lower end of the connecting pipe (13) due to buoyancy, and a large amount of water is not allowed to pass through. The two discharge pipes (24) on the condensate storage tank (2) are used for separate discharge. There are multiple separation heads (12), and oil-water separation can be achieved as long as the water level is between the lower end and the upper end of the recovery cylinder (11).

2. The oil refining waste gas purification and recovery equipment according to claim 1, characterized in that: A liquid level stabilizing mechanism (17) is provided outside the oil-water separation mechanism (8), and the liquid level stabilizing mechanism (17) comprises a baffle ring (18) and a filter cartridge (19), the baffle ring (18) being a horizontally arranged annular plate, the inner edge of the baffle ring (18) being connected to the outer wall of the lower end of the recovery cartridge (11), the outer edge of the baffle ring (18) being connected to the filter cartridge (19), and the filter cartridge (19) being surrounded outside the recovery cartridge (11).

3. The oil refining waste gas purification and recovery equipment according to claim 2, characterized in that: The mesh size of the filter cartridge (19) is 40-100 mesh.

4. The oil refining waste gas purification and recovery equipment according to claim 1, characterized in that: A gas distributor (20) is provided below the cooling coil (7), the gas distributor (20) comprising a fixed plate (21) and a ventilating cone (22), the fixed plate (21) being connected to the inner wall of the condensation recovery tank (1), the fixed plate (21) being provided with ventilating holes evenly distributed thereon, each of the ventilating holes being connected to a ventilating cone (22) located above the fixed plate (21).

5. The oil refining waste gas purification and recovery equipment according to claim 1, characterized in that: The lower portion of the condensate recovery tank (1) is provided with a drainage pipe (23), and the lower end and the middle portion of the condensate storage tank (2) are both connected to a discharge pipe (24).

6. The oil refining waste gas purification and recovery equipment according to claim 1, characterized in that: The liquid sprayed by the spray tower (3) is an aqueous solution of sodium carbonate.

7. The oil refining waste gas purification and recovery equipment according to claim 1, characterized in that: The system further comprises a compression recovery module (26), wherein the compression recovery module (26) comprises a buffer tank (27), an ultra-high pressure gas compressor (28) and a separation tank (29) which are connected in sequence, wherein the buffer tank (27) is a cylindrical tank body, wherein a guide rod (30) is provided in the buffer tank (27), wherein a piston disk (31) is slidably connected to the guide rod (30), wherein the piston disk (31) is in sliding contact with the inner wall of the buffer tank (27), and the buffer tank (27) is connected to the spray tower (39) via a gas transmission pipe (32) below the piston disk (31). ), a displacement sensor (33) is provided at the top of the buffer tank (27), the displacement sensor (33) detects the distance between the piston disc (31) and the top of the buffer tank (27), and according to the size of the distance, the ultra-high pressure gas compressor (28) and the spray tower (3) are started or stopped, the outlet of the ultra-high pressure gas compressor (28) is connected to the separation tank (29), and the bottom external discharge pipeline (34) of the spray tower (3) is higher than the connection between the exhaust pipe (4) and the spray tower (3).

8. The oil refining waste gas purification and recovery equipment according to claim 7, characterized in that: The separation tank (29) is a sealed tank body. A hydrocarbon exhaust pipeline (35) is provided at the lower end of the separation tank (29). The upper end of the separation tank (29) is connected to an exhaust gas discharge pipeline (36). A pressure limiting valve (37) is provided on the exhaust gas discharge pipeline (36). The minimum value of the pressure limiting valve (37) is 9 MPa.

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