A supersonic swirl oil and gas VOCS condensation recovery system

Abstract

The present invention provides a supersonic cyclone oil and gas (VOCS) condensation recovery system, comprising a separation unit, wherein the separation unit comprises an ejector unit (1), a supersonic cyclone separation unit (2) and a circulating air pressurizing unit (3). The supersonic cyclone oil and gas (VOCS) condensation recovery system adopts supersonic cyclone separation technology to condense hydrocarbons in oil and gas (VOCs) and then separate them. The system does not require additional refrigeration equipment and does not contain low-temperature moving parts. The process structure is simple and reliable, the number of equipment is small, and the construction cost is low. The system also uses circulating clean air to eject the oil and gas (VOCs) feed, thereby avoiding the safety hazard of flammability and explosion caused by the heat generated after direct compression of the oil and gas (VOCs).

Description

Technical Field

[0001] The present invention relates to the field of ejectors and supersonic liquefaction, and in particular to a supersonic cyclone oil and gas VOCs condensation recovery system. Background Art

[0002] During the production, storage, transportation, and use of oil products in the petrochemical industry, large amounts of light hydrocarbon components evaporate into the air due to factors such as respiration in oil depots, forming volatile organic chemicals (VOCs). This creates severe environmental pollution and energy waste. Recovering VOCs has significant energy-saving and environmental benefits, as well as significant economic value. my country has formulated standards such as the "Petrochemical Industry Pollutant Emission Standard (GB-31571)," stipulating that non-methane hydrocarbon (NMHC) emission concentrations should be below 120 mg / m³, with a removal efficiency exceeding 95%.

[0003] Current methods for treating VOCs in oil and gas primarily include incineration, condensation, absorption, adsorption, membrane separation, and combinations of these methods. Except for incineration, all of these methods can recover hydrocarbons from VOCs in oil and gas. While absorption, adsorption, and membrane separation are relatively simple, they suffer from issues such as low recovery rates, heat generation from adsorption that can lead to combustion, and limited lifespans for consumables such as absorbents, adsorbents, and separation membranes.

[0004] The condensation method can directly and continuously recover hydrocarbons from oil and gas VOCs, and has a low operating temperature and good safety. Existing oil and gas VOCs condensation recovery systems mostly use two- to three-stage cascade refrigerators, but these consume a lot of energy. At the same time, the refrigeration system has a complex structure, many compressors and other equipment, and the initial investment in equipment is high, which to a certain extent limits the application of the condensation method.

[0005] In addition, the separation effect of oil and gas VOCs can be significantly improved after pressurization, but the temperature increases during the compression process, posing a safety hazard of flammability and explosion. A safer means of pressurizing oil and gas VOCs is needed.

[0006] At present, supersonic cyclone separation technology has been applied to fields such as natural gas liquefaction. Its process structure is simple and does not require additional refrigeration equipment. It shows good liquefaction and separation effects and has certain application prospects in the field of oil and gas VOCs condensation.

[0007] Therefore, it is necessary to build a safe, efficient, simple and low-cost oil and gas VOCs condensation recovery process based on the ejector principle and supersonic cyclone separation technology. Summary of the Invention

[0008] In view of this, it is necessary to provide a supersonic cyclone oil and gas VOCS condensation recovery system that is safe, efficient, simple in structure and low in cost to address the defects of the existing technology.

[0009] To achieve the above object, the present invention adopts the following technical solutions:

[0010] A supersonic cyclone oil and gas VOCS condensation recovery system comprises a separation unit, wherein the separation unit comprises an ejector unit (1), a supersonic cyclone separation unit (2) and a circulating air pressurizing unit (3), wherein the ejector unit (1) comprises a working fluid nozzle (101), an intake chamber (102), a mixing section (103) and a diffuser section (104); the supersonic cyclone separation unit (2) comprises an inlet stabilizing section (201), a Laval nozzle (202), a cyclone (203), a straight pipe section (204), a separator (205), a diffuser section (206) and a distributor (207), wherein separation holes are distributed on the straight pipe section (204) and the diffuser section (206); the circulating air pressurizing unit (3) comprises an air compressor (301) and a cooler (302), wherein:

[0011] External oil and gas VOCs are sucked into the suction chamber (102) and enter the mixing section (103) together with the circulating air to be fully mixed, and then enter the diffuser section (104) to be decelerated and pressurized to form a high-pressure oil and gas mixture;

[0012] The high-pressure oil-gas mixture enters the inlet stabilization section (201), and then enters the Laval nozzle (202) to reduce pressure and temperature and accelerate the formation of a low-pressure and high-speed oil-gas mixture with hydrocarbon droplets;

[0013] The low-pressure and high-speed oil-gas mixture is formed into a swirling flow by the swirler (203) and then enters the diffuser section (206) through the straight pipe section (204);

[0014] The hydrocarbon droplets in the low-pressure and high-speed oil-gas mixture enter the separator (205) through the separation holes under the action of centrifugation, and the collected liquid hydrocarbons are discharged and recovered from the outlet of the separator (205);

[0015] The clean air formed after the hydrocarbon droplets are separated from the low-pressure and high-speed oil-gas mixture is decelerated and pressurized by the diffuser section (206) and then divided into two streams by the distributor (207), one of which is a small stream entering the circulating air pressurizing unit (3) as circulating air, and the other large stream is discharged as exhaust gas or enters the next stage separation unit;

[0016] The circulating air is pressurized to a relatively high pressure by the air compressor (301) and then cooled to a suitable temperature by the cooler (302) to form high-pressure circulating air;

[0017] The high-pressure circulating air is ejected through the working fluid nozzle (101) to form a high-speed fluid, forming a low pressure in the suction chamber (102), sucking external oil and gas VOCs into the suction chamber (102), completing the cycle.

[0018] In some embodiments, the circulating air pressurizing unit (3) further includes a circulating air expander 303. The circulating air is pressurized by the air compressor (301) and then cooled to a suitable temperature by the cooler (302) to form high-pressure circulating air. The high-pressure circulating air is cooled and reduced in pressure to a suitable intermediate pressure by the circulating air expander 303 before entering the working fluid nozzle (101) of the ejector unit (1).

[0019] In some embodiments, the circulating air pressurizing unit (3) further includes a circulating air expander 303 and a pre-cooling regenerator 304. The circulating air is pressurized by the air compressor (301) and then cooled to a suitable temperature by the cooler (302) to form high-pressure circulating air. The high-pressure circulating air is cooled by the clean air with a lower temperature in the pre-cooling regenerator 304, and then cooled and reduced in pressure to a suitable intermediate pressure by the circulating air expander 303 before entering the working fluid nozzle (101) of the ejector unit (1).

[0020] In some embodiments, the supersonic cyclone separation unit (2) further includes a clean air expander 208, and the circulating air booster unit (3) further includes a pre-cooling regenerator 304. The clean air formed after the hydrocarbon droplets are separated from the low-pressure and high-speed oil-gas mixture is decelerated and pressurized by the diffuser section (206), and then cooled and depressurized by the clean air expander 208 before entering the pre-cooling regenerator 304 to provide cooling capacity. The clean air is then divided into two streams by the distributor (207), a small stream of which enters the circulating air booster unit (3) as circulating air, and the other large stream is discharged as exhaust gas or enters the next-stage separation unit; the circulating air is pressurized by the air compressor (301) and cooled by the cooler (302) and the pre-cooling regenerator 304 in sequence, and then enters the working fluid nozzle (101) of the ejector unit (1).

[0021] In some embodiments, the supersonic cyclone separation unit (3) further comprises a clean air expander (208) and a high-pressure oil and gas regenerator (209); the clean air formed after the hydrocarbon droplets are separated from the low-pressure and high-speed oil and gas mixture is decelerated and pressurized by the diffuser section (206), and then cooled and depressurized by the clean air expander (208) before entering the high-pressure oil and gas regenerator (209) to provide cooling capacity, and then divided into two streams by the distributor (207); a small stream is used as circulating air to enter the circulating air pressurizing unit (3), and the other large stream is discharged as tail gas or enters the next stage separation unit;

[0022] The high-pressure oil-gas mixture is decelerated and pressurized in the diffuser section (104), is cooled by the clean air at a lower temperature in the high-pressure oil-gas regenerator 209, and then enters the inlet stabilization section (201) of the supersonic cyclone separation unit (2).

[0023] In some embodiments, the separation unit has two or more stages.

[0024] In some embodiments, the cooler (302) may be a water chiller, an air-cooled cooler, or a pre-cooling refrigerator.

[0025] The advantages of the present invention using the above technical solution are:

[0026] The supersonic cyclone oil and gas VOCS condensation recovery system provided by the present invention uses supersonic cyclone separation technology to condense and separate hydrocarbons in oil and gas VOCs. It does not require additional refrigeration equipment and does not contain low-temperature moving parts. The process structure is simple and reliable, the number of equipment is small, and the construction cost is low. The oil and gas VOCs feed is introduced through circulating clean air, avoiding the safety hazards of flammability and explosion caused by heat after direct compression of the oil and gas VOCs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 paying any creative work.

[0028] Figure 1 This is a structural schematic diagram of the supersonic cyclonic oil and gas VOCS condensation recovery system provided in Example 1 of the present invention.

[0029] Figure 2 This is a structural schematic diagram of the supersonic cyclonic oil and gas VOCS condensation recovery system provided in Example 2 of the present invention.

[0030] Figure 3 This is a structural schematic diagram of the supersonic cyclonic oil and gas VOCS condensation recovery system provided in Example 3 of the present invention.

[0031] Figure 4 This is a structural diagram of the supersonic cyclonic oil and gas VOCS condensation recovery system provided in Example 4 of the present invention.

[0032] Figure 5 This is a structural schematic diagram of the supersonic cyclonic oil and gas VOCS condensation recovery system provided in Example 5 of the present invention.

[0033] Figure 6This is a structural diagram of the supersonic cyclonic oil and gas VOCS condensation recovery system provided in Example 6 of the present invention. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] Example 1

[0036] See also Figure 1 , which is a structural schematic diagram of the supersonic cyclone oil and gas VOCS condensation recovery system provided in Example 1 of the present invention, comprising: a separation unit, wherein the separation unit comprises an ejector unit (1), a supersonic cyclone separation unit (2) and a circulating air pressurizing unit (3).

[0037] The ejector unit (1) comprises a working fluid nozzle (101), an intake chamber (102), a mixing section (103) and a diffuser section (104), and the ejector unit (1) can be used for safe pressurization of oil and gas VOCs feed; the supersonic cyclone separation unit (2) comprises an inlet stabilization section (201), a Laval nozzle (202), a cyclone (203), a straight pipe section (204), a separator (205), a diffuser section (206) and a distributor (207), and separation holes are distributed on the straight pipe section (204) and the diffuser section (206), and the supersonic cyclone separation unit (2) can be used for condensing and separating hydrocarbons in a high-pressure oil and gas mixture; the circulating air boosting unit (3) comprises an air compressor (301) and a cooler (302), and the circulating air boosting unit (3) can be used for providing high-pressure circulating air with a suitable temperature.

[0038] The cooler (302) can be a water chiller, an air-cooled cooler or a pre-cooling refrigerator.

[0039] The supersonic cyclonic oil and gas VOCS condensation recovery system provided in the above embodiment 1 works as follows:

[0040] External oil and gas VOCs are sucked into the suction chamber (102) and enter the mixing section (103) together with the circulating air to be fully mixed, and then enter the diffuser section (104) to be decelerated and pressurized to form a high-pressure oil and gas mixture;

[0041] The high-pressure oil-gas mixture enters the inlet stabilization section (201), and then enters the Laval nozzle (202) to reduce pressure and temperature and accelerate the formation of a low-pressure and high-speed oil-gas mixture with hydrocarbon droplets;

[0042] The low-pressure and high-speed oil-gas mixture is formed into a swirling flow by the swirler (203) and then enters the diffuser section (206) through the straight pipe section (204);

[0043] The hydrocarbon droplets in the low-pressure and high-speed oil-gas mixture enter the separator (205) through the separation holes under the action of centrifugation, and the collected liquid hydrocarbons are discharged and recovered from the outlet of the separator (205);

[0044] The clean air formed after the hydrocarbon droplets are separated from the low-pressure and high-speed oil-gas mixture is decelerated and pressurized by the diffuser section (206) and then divided into two streams by the distributor (207), one of which is a small stream entering the circulating air pressurizing unit (3) as circulating air, and the other large stream is discharged as exhaust gas or enters the next stage separation unit;

[0045] The circulating air is pressurized to a relatively high pressure by the air compressor (301) and then cooled to a suitable temperature by the cooler (302) to form high-pressure circulating air;

[0046] The high-pressure circulating air is ejected through the working fluid nozzle (101) to form a high-speed fluid, forming a low pressure in the suction chamber (102), sucking external oil and gas VOCs into the suction chamber (102), completing the cycle.

[0047] The supersonic cyclone oil and gas VOCs condensation and recovery system provided in the above-mentioned embodiment 1 of the present invention adopts supersonic cyclone separation technology to condense and separate hydrocarbons in oil and gas VOCs. It does not require additional refrigeration equipment, does not contain low-temperature moving parts, and has a simple and reliable structure. It also uses circulating clean air to introduce oil and gas VOCs feed, avoiding the safety hazard of flammability and explosion caused by heat after direct compression of oil and gas VOCs.

[0048] Example 2

[0049] See also Figure 2 , which is a structural schematic diagram of the supersonic cyclone oil and gas VOCS condensation recovery system provided in Example 2 of the present invention.

[0050] The difference from Example 1 is that the circulating air pressurizing unit (3) further includes a circulating air expander 303. The circulating air is pressurized by the air compressor (301) and then cooled to a suitable temperature by the cooler (302) to form high-pressure circulating air. The high-pressure circulating air is cooled and reduced in pressure to a suitable intermediate pressure by the circulating air expander 303 before entering the working fluid nozzle (101) of the ejector unit (1).

[0051] The other working methods are the same as those in Example 1 of the present invention and will not be described again here.

[0052] It can be understood that in this embodiment, the circulating air expander 303 can reduce the temperature of the high-pressure circulating air and the temperature of the high-pressure oil-gas mixture, thereby improving the condensation separation effect.

[0053] The supersonic cyclone oil and gas VOCs condensation and recovery system provided in the above-mentioned embodiment 2 of the present invention adopts supersonic cyclone separation technology to condense and separate hydrocarbons in oil and gas VOCs. It does not require additional refrigeration equipment, does not contain low-temperature moving parts, and has a simple and reliable structure. It also uses circulating clean air to introduce oil and gas VOCs feed, avoiding the safety hazard of flammability and explosion caused by heat after direct compression of oil and gas VOCs.

[0054] Example 3

[0055] See also Figure 3 , which is a structural schematic diagram of the supersonic cyclone oil and gas VOCS condensation recovery system provided in Example 3 of the present invention.

[0056] The difference from Example 1 is that the circulating air pressurizing unit (3) further includes a circulating air expander 303 and a pre-cooling regenerator 304. The circulating air is pressurized by the air compressor (301) and then cooled to a suitable temperature by the cooler (302) to form high-pressure circulating air. The high-pressure circulating air is cooled by the clean air with a lower temperature in the pre-cooling regenerator 304, and then cooled and reduced in pressure to a suitable intermediate pressure by the circulating air expander 303 before entering the working fluid nozzle (101) of the ejector unit (1).

[0057] The other working methods are the same as those in Example 1 of the present invention and will not be described again here.

[0058] It can be understood that the use of the circulating air expander 303 and the pre-cooling regenerator 304 in this embodiment can further reduce the temperature of the high-pressure circulating air and the temperature of the high-pressure oil-gas mixture, thereby improving the condensation separation effect.

[0059] The supersonic cyclone oil and gas VOCs condensation and recovery system provided in the above-mentioned embodiment 3 of the present invention adopts supersonic cyclone separation technology to condense and separate hydrocarbons in oil and gas VOCs. It does not require additional refrigeration equipment, does not contain low-temperature moving parts, and has a simple and reliable structure. It also uses circulating clean air to introduce oil and gas VOCs feed, avoiding the safety hazard of flammability and explosion caused by heat after direct compression of oil and gas VOCs.

[0060] Example 4

[0061] See also Figure 4 , which is a structural schematic diagram of the supersonic cyclone oil and gas VOCS condensation recovery system provided in Example 4 of the present invention.

[0062] The difference from Example 1 is that the supersonic cyclone separation unit (2) further includes a clean air expander 208, and the circulating air booster unit (3) further includes a pre-cooling regenerator 304. The clean air formed after the hydrocarbon droplets are separated from the low-pressure and high-speed oil-gas mixture is decelerated and pressurized by the diffuser section (206), and then cooled and depressurized by the clean air expander 208 before entering the pre-cooling regenerator 304 to provide cooling capacity. The clean air is then divided into two streams by the distributor (207), a small stream of which enters the circulating air booster unit (3) as circulating air, and the other large stream is discharged as exhaust gas or enters the next-stage separation unit; the circulating air is pressurized by the air compressor (301) and cooled by the cooler (302) and the pre-cooling regenerator 304 in sequence, and then enters the working fluid nozzle (101) of the ejector unit (1).

[0063] The other working methods are the same as those in Example 1 of the present invention and will not be described again here.

[0064] It can be understood that in this embodiment, by providing the clean air expander 208 and the pre-cooling regenerator 304, the temperature of the high-pressure circulating air and the temperature of the high-pressure oil-gas mixture can be further reduced, thereby improving the condensation separation effect.

[0065] The supersonic cyclone oil and gas VOCs condensation and recovery system provided in the above-mentioned embodiment 4 of the present invention adopts supersonic cyclone separation technology to condense and separate hydrocarbons in oil and gas VOCs. It does not require additional refrigeration equipment, does not contain low-temperature moving parts, and has a simple and reliable structure. It also uses circulating clean air to inject oil and gas VOCs into the feed, avoiding the safety hazards of flammability and explosion caused by heat generated after directly compressing the oil and gas VOCs.

[0066] Example 5

[0067] See also Figure 5 , which is a structural schematic diagram of the supersonic cyclone oil and gas VOCS condensation recovery system provided in Example 5 of the present invention.

[0068] The difference from Example 1 of the present invention is that the supersonic cyclone separation unit (3) further includes a clean air expander (208) and a high-pressure oil and gas regenerator (209); the clean air formed after the hydrocarbon droplets are separated from the low-pressure and high-speed oil and gas mixture is decelerated and pressurized by the expansion section (206), and then cooled and depressurized by the clean air expander (208) before entering the high-pressure oil and gas regenerator (209) to provide cooling capacity, and then divided into two streams by the distributor (207); a small stream enters the circulating air boosting unit (3) as circulating air, and the other large stream is discharged as tail gas or enters the next stage separation unit;

[0069] The high-pressure oil-gas mixture is decelerated and pressurized in the diffuser section (104), is cooled by the clean air at a lower temperature in the high-pressure oil-gas regenerator 209, and then enters the inlet stabilization section (201) of the supersonic cyclone separation unit (2).

[0070] The other working methods are the same as those in Example 1 of the present invention and will not be described again here.

[0071] It can be understood that in this embodiment, by providing the clean air expander 208 and the high-pressure oil-gas regenerator 209 , the temperature of the high-pressure oil-gas mixture can be further reduced, thereby improving the condensation separation effect.

[0072] The supersonic cyclone oil and gas VOCs condensation and recovery system provided in the above-mentioned embodiment 5 of the present invention adopts supersonic cyclone separation technology to condense and separate hydrocarbons in oil and gas VOCs. It does not require additional refrigeration equipment, does not contain low-temperature moving parts, and has a simple and reliable structure. It also uses circulating clean air to inject oil and gas VOCs into the feed, avoiding the safety hazard of flammability and explosion caused by heat generated after directly compressing the oil and gas VOCs.

[0073] Example 6

[0074] See also Figure 6 , which is a structural schematic diagram of the supersonic cyclone oil and gas VOCS condensation recovery system provided in Example 6 of the present invention.

[0075] The difference from Example 1 of the present invention is that in the supersonic cyclone oil and gas VOCs condensation recovery system provided by Example 6 of the present invention, the separation unit is two-stage or more, and after the exhaust gas is discharged from the first-stage separation unit, it enters the next-stage separation unit to further separate the residual hydrocarbons; the two-stage separation unit method can further reduce the emission residue.

[0076] The supersonic cyclone oil and gas VOCs condensation and recovery system provided in the above-mentioned embodiment 6 of the present invention adopts supersonic cyclone separation technology to condense and separate hydrocarbons in oil and gas VOCs. It does not require additional refrigeration equipment, does not contain low-temperature moving parts, and has a simple and reliable structure. It also uses circulating clean air to inject oil and gas VOCs into the feed, avoiding the safety hazard of flammability and explosion caused by heat generated after directly compressing the oil and gas VOCs.

[0077] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0078] Of course, the positive electrode material of the supersonic cyclonic oil and gas VOCS condensation recovery system of the present invention can be subjected to various variations and modifications and is not limited to the specific structure of the above embodiment. In short, the scope of protection of the present invention should include those variations, substitutions, and modifications that are obvious to those skilled in the art.

Claims

1. A supersonic cyclonic oil and gas VOCS condensation recovery system, characterized in that: The invention comprises a separation unit, wherein the separation unit comprises an ejector unit (1), a supersonic cyclone separation unit (2) and a circulating air pressurizing unit (3), wherein the ejector unit (1) comprises a working fluid nozzle (101), an intake chamber (102), a mixing section (103) and a first diffuser section (104); the supersonic cyclone separation unit (2) comprises an inlet stabilizing section (201), a Laval nozzle (202), a cyclone (203), a straight pipe section (204), a separator (205), a second diffuser section (206) and a distributor (207), and separation holes are distributed on the straight pipe section (204) and the second diffuser section (206); the circulating air pressurizing unit (3) comprises an air compressor (301) and a cooler (302), wherein: External oil and gas VOCs are sucked into the suction chamber (102) and enter the mixing section (103) together with the circulating air to be fully mixed, and then enter the first diffuser section (104) to be decelerated and pressurized to form a high-pressure oil and gas mixture; The high-pressure oil-gas mixture enters the inlet stabilization section (201), and then enters the Laval nozzle (202) to reduce pressure and temperature and accelerate the formation of a low-pressure and high-speed oil-gas mixture with hydrocarbon droplets; The low-pressure, high-speed oil-gas mixture forms a swirling flow through the swirler (203) and then enters the second diffuser section (206) through the straight pipe section (204); The hydrocarbon droplets in the low-pressure and high-speed oil-gas mixture enter the separator (205) through the separation holes under the action of centrifugation, and the collected liquid hydrocarbons are discharged and recovered from the outlet of the separator (205); The clean air formed after the hydrocarbon droplets are separated from the low-pressure and high-speed oil-gas mixture is decelerated and pressurized by the second diffuser section (206) and then divided into two streams by the distributor (207), one of which is used as circulating air to enter the circulating air pressurizing unit (3), and the other is used as exhaust gas to be discharged or enter the next stage separation unit; The circulating air is pressurized to a relatively high pressure by the air compressor (301) and then cooled to a suitable temperature by the cooler (302) to form high-pressure circulating air; The high-pressure circulating air is ejected through the working fluid nozzle (101) to form a high-speed fluid, forming a low pressure in the suction chamber (102), and sucking external oil and gas VOCs into the suction chamber (102), completing the cycle.

2. The supersonic cyclone oil and gas VOCS condensation recovery system according to claim 1 is characterized in that: The circulating air pressurizing unit (3) further includes a circulating air expander 303. The circulating air is pressurized by the air compressor (301) and then cooled to a suitable temperature by the cooler (302) to form high-pressure circulating air. The high-pressure circulating air is cooled and reduced in pressure to a suitable intermediate pressure by the circulating air expander 303 before entering the working fluid nozzle (101) of the ejector unit (1).

3. The supersonic cyclone oil and gas VOCS condensation recovery system according to claim 1 is characterized in that: The circulating air pressurizing unit (3) further comprises a circulating air expander (303) and a pre-cooling regenerator (304). The circulating air is pressurized by the air compressor (301) and then cooled to a suitable temperature by the cooler (302) to form high-pressure circulating air. The high-pressure circulating air is cooled by the clean air with a lower temperature in the pre-cooling regenerator 304, and then cooled and decompressed to a suitable intermediate pressure by the circulating air expander 303 before entering the working fluid nozzle (101) of the ejector unit (1).

4. The supersonic cyclone oil and gas VOCS condensation recovery system according to claim 1, wherein the supersonic cyclone separation unit (2) further comprises a clean air expander 208, and the circulating air booster unit (3) further comprises a pre-cooling regenerator 304. The clean air formed after the hydrocarbon droplets are separated from the low-pressure and high-speed oil and gas mixture is decelerated and pressurized by the second diffuser section (206), and then cooled and depressurized by the clean air expander 208 before entering the pre-cooling regenerator 304 to provide cooling capacity. The clean air is then divided into two streams by the distributor (207), a small stream of which enters the circulating air booster unit (3) as circulating air, and the other large stream is discharged as exhaust gas or enters the next-stage separation unit; the circulating air is pressurized by the air compressor (301) and cooled by the cooler (302) and the pre-cooling regenerator 304 in sequence, and then enters the working fluid nozzle (101) of the ejector unit (1).

5. The supersonic cyclone oil and gas VOCS condensation recovery system according to claim 1, characterized in that: The supersonic cyclone separation unit (2) further includes a clean air expander (208) and a high-pressure oil and gas regenerator (209). The clean air formed after the hydrocarbon droplets are separated from the low-pressure and high-speed oil and gas mixture is decelerated and pressurized by the second diffuser (206), and then cooled and depressurized by the clean air expander (208) before entering the high-pressure oil and gas regenerator (209) to provide cooling capacity. The clean air is then divided into two streams by the distributor (207), a small stream of which enters the circulating air boosting unit (3) as circulating air, and the other large stream is discharged as tail gas or enters the next-stage separation unit. The high-pressure oil-gas mixture is decelerated and pressurized in the first diffuser section (104), is cooled by the clean air at a lower temperature in the high-pressure oil-gas regenerator (209), and then enters the inlet stabilization section (201) of the supersonic cyclone separation unit (2).

6. The supersonic cyclonic oil and gas VOCS condensation recovery system according to any one of claims 1 to 5, characterized in that: The separation unit has two or more stages.

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