CN111171868A - Oil gas recovery device - Google Patents
Oil gas recovery device Download PDFInfo
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- CN111171868A CN111171868A CN202010093578.1A CN202010093578A CN111171868A CN 111171868 A CN111171868 A CN 111171868A CN 202010093578 A CN202010093578 A CN 202010093578A CN 111171868 A CN111171868 A CN 111171868A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G70/00—Working-up undefined normally gaseous mixtures obtained by processes covered by groups C10G9/00, C10G11/00, C10G15/00, C10G47/00, C10G51/00
- C10G70/04—Working-up undefined normally gaseous mixtures obtained by processes covered by groups C10G9/00, C10G11/00, C10G15/00, C10G47/00, C10G51/00 by physical processes
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G70/00—Working-up undefined normally gaseous mixtures obtained by processes covered by groups C10G9/00, C10G11/00, C10G15/00, C10G47/00, C10G51/00
- C10G70/04—Working-up undefined normally gaseous mixtures obtained by processes covered by groups C10G9/00, C10G11/00, C10G15/00, C10G47/00, C10G51/00 by physical processes
- C10G70/043—Working-up undefined normally gaseous mixtures obtained by processes covered by groups C10G9/00, C10G11/00, C10G15/00, C10G47/00, C10G51/00 by physical processes by fractional condensation
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G70/00—Working-up undefined normally gaseous mixtures obtained by processes covered by groups C10G9/00, C10G11/00, C10G15/00, C10G47/00, C10G51/00
- C10G70/04—Working-up undefined normally gaseous mixtures obtained by processes covered by groups C10G9/00, C10G11/00, C10G15/00, C10G47/00, C10G51/00 by physical processes
- C10G70/046—Working-up undefined normally gaseous mixtures obtained by processes covered by groups C10G9/00, C10G11/00, C10G15/00, C10G47/00, C10G51/00 by physical processes by adsorption, i.e. with the use of solids
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G70/00—Working-up undefined normally gaseous mixtures obtained by processes covered by groups C10G9/00, C10G11/00, C10G15/00, C10G47/00, C10G51/00
- C10G70/04—Working-up undefined normally gaseous mixtures obtained by processes covered by groups C10G9/00, C10G11/00, C10G15/00, C10G47/00, C10G51/00 by physical processes
- C10G70/06—Working-up undefined normally gaseous mixtures obtained by processes covered by groups C10G9/00, C10G11/00, C10G15/00, C10G47/00, C10G51/00 by physical processes by gas-liquid contact
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention provides an oil gas recovery device, which comprises an absorption, condensation, adsorption and desorption system, wherein the absorption system comprises an absorption tower, a compressor and an oil storage tank, the oil storage tank is respectively communicated with the top of the absorption tower and a liquid inlet of a liquid ring compressor through an oil pump, an exhaust port of the liquid ring compressor is communicated with a gas inlet of the absorption tower, the bottom of the absorption tower is communicated with an oil collection tank, and the oil collection tank is communicated with the oil storage tank through an oil return pump; the condensing system comprises a first heat exchanger, a first gas-liquid separator, a second gas-liquid separator, a third gas-liquid separator and a cascade refrigerating unit, wherein liquid outlets of the first gas-liquid separator, the second gas-liquid separator and the third gas-liquid separator are communicated with an oil collecting tank; the adsorption system comprises an adsorption tower communicated with the air outlet of the third gas-liquid separator; the desorption system comprises a liquid ring vacuum pump, and a gas outlet of the liquid ring vacuum pump is communicated with the oil collecting tank. The device can condense, liquefy and recover C2 and C3 molecules without cryogenic cooling, thereby achieving milligram (mg/m) grade emission of non-methane total hydrocarbon value, and the oil gas recovery rate is high, and the whole device is safe, stable, efficient and energy-saving.
Description
Technical Field
The invention relates to the technical field of oil gas recovery, in particular to an oil gas recovery device.
Background
During oil recovery, transportation, storage, transfer, processing, and production, storage, transportation, transfer, sale of crude oil processed products (hydrocarbons, alcohols, benzenes, etc.), a large amount of oil and gas escapes into the atmosphere.
The oil gas is dissipated into the atmosphere, so that the evaporation loss of oil products is caused, the resource waste is caused, and safety hidden troubles and environmental hazards are brought.
Because the explosion limit of oil gas is 1% -6% (volume), the concentration of oil gas around the oil gas escape facility can easily reach the explosion limit, the high-concentration oil gas gathered near the ground brings great disaster risks to enterprises and consumers, and explosion accidents easily occur in an oil unloading area and an oil distributing area.
the oil gas is one of the gases of VOCs, and the VOCs are the precursor for generating ozone, so the emission of the oil gas can cause serious pollution to the environment, most of the VOCs are toxic and malodorous, and have carcinogenic effect partially, and when several toxic substances in the atmosphere coexist, the harm generated is much larger due to the toxic additive effect.
Oil gas belongs to typical volatile organic compounds, and most of the 12 VOCs major industries which are clearly concerned by the country relate to petroleum and products thereof. Through the research on the oil gas emission mechanism and the research, development, popularization and application of the oil gas recovery technology in China for nearly 30 years, the 'contribution rate' of oil gas to atmospheric pollution is greatly reduced on the whole. With the universalization of the oil gas pollution control range, more refined control indexes and increased supervision of the effectiveness of the oil gas recovery equipment, the oil gas recovery technology faces new challenges.
Currently, the oil gas recovery technology generally adopts the following methods: however, in the methods in the prior art, the emission concentration of the processed oil gas can only achieve the non-methane total hydrocarbon value of less than or equal to 25g/m for cultivation, and with increasingly strict environmental requirements, some regions and industries have required that the non-methane total hydrocarbon emission value of an oil gas recovery system reaches less than or equal to 80mg/m for cultivation, even higher-level emission requirements, and at present, on the basis of optimizing respective processes, a whole set of oil gas recovery processes integrated by different processes needs to be researched and developed.
According to the physicochemical properties of the oil gas, if the non-methane total hydrocarbon value is to realize the emission of less than or equal to 80mg/m, the problem of effective recovery of the oil gas containing light hydrocarbon components below C3 needs to be solved. For oil gas containing light hydrocarbon components below C3, a refrigerating unit needs to achieve subzero condensation at the temperature of-110 ℃, so that the condensation load of a low-temperature level is increased, the energy consumption of the unit is obviously increased, and the failure rate is increased. On the other hand, in the combined process of condensation and adsorption, C2 is not easy to condense at-70 ℃, so that C2 molecules are accumulated in the whole system in a circulating manner, and finally, the emission is inevitably exceeded.
Disclosure of Invention
The invention aims to provide an oil gas recovery device, which can condense, liquefy and recover C2 and C3 molecules without deep cooling, so that milligram (mg/m) grade emission of non-methane total hydrocarbon value is achieved, the oil gas recovery rate is high, and the whole device is safe, stable, efficient and energy-saving.
In order to achieve the purpose, the oil gas recovery device adopts the technical scheme that: the oil gas recovery device comprises an absorption system, a condensation system, an adsorption system and a desorption system;
the absorption system comprises an absorption tower, a liquid ring compressor and an oil storage tank, wherein the oil storage tank is provided with a lean absorbent outlet and a rich absorbent inlet, the lean absorbent outlet of the oil storage tank is respectively communicated with the top of the absorption tower and the liquid inlet of the liquid ring compressor through an oil pump, the gas inlet of the liquid ring compressor is communicated with a main oil gas inlet pipeline, the gas outlet of the liquid ring compressor is communicated with the gas inlet of the absorption tower, the bottom of the absorption tower is communicated with the reflux port of the oil collection tank through a reflux pipe, and the oil outlet of the oil collection tank is communicated with the rich absorbent inlet of the oil storage tank through an oil return pump;
the condensing system comprises a first heat exchanger, a first gas-liquid separator, a second gas-liquid separator, a third gas-liquid separator and a cascade refrigerating unit, the cascade refrigerating unit comprises a high-temperature-stage compressor, a first condenser, a first throttling valve, a condensing evaporator, a low-temperature-stage compressor, a second condenser, a second throttling valve, a second heat exchanger and a third heat exchanger, the high-temperature-stage compressor, the first condenser, the first throttling valve and the condensing evaporator form a high-temperature-stage refrigerating loop, the low-temperature-stage compressor, the second condenser, the condensing evaporator, the second throttling valve, the second heat exchanger and the third heat exchanger form a low-temperature-stage refrigerating loop, an exhaust port of an absorption tower is communicated with a hot fluid inlet of the first heat exchanger, a hot fluid outlet of the first heat exchanger is communicated with an inlet of the first gas-liquid separator, a fluid outlet of the first gas-liquid separator is communicated with, the gas outlet of the first gas-liquid separator is communicated with the hot fluid inlet of the second heat exchanger, the hot fluid outlet of the second heat exchanger is communicated with the inlet of the second gas-liquid separator, the liquid outlet of the second gas-liquid separator is communicated with the oil return port of the oil collecting tank, the gas outlet of the second gas-liquid separator is communicated with the hot fluid inlet of the third heat exchanger, the hot fluid outlet of the third heat exchanger is communicated with the inlet of the third gas-liquid separator, and the liquid outlet of the third gas-liquid separator is communicated with the gas inlet of the liquid ring compressor;
the adsorption system comprises an activated carbon adsorption tower, and a gas inlet of the activated carbon adsorption tower is communicated with a gas outlet of the third gas-liquid separator;
the desorption system comprises a liquid ring vacuum pump, a liquid inlet of the liquid ring vacuum pump is communicated with a lean absorbent outlet of the oil storage tank through an oil pump, an air inlet of the liquid ring vacuum pump is communicated with a desorption opening of the adsorption tower, an air outlet of the liquid ring vacuum pump is communicated with an air return opening of the oil collection tank, and an air escape opening of the oil collection tank is communicated with a main oil gas inlet pipeline through an air escape pipeline.
Preferably, a gas outlet of the third gas-liquid separator is communicated with a cold fluid inlet of the first heat exchanger, and a cold fluid outlet of the first heat exchanger is communicated with an inlet of the activated carbon adsorption tower.
Preferably, the active carbon adsorption towers are connected in parallel to form two active carbon adsorption towers, a first electric three-way valve is arranged between the air inlets of the two active carbon adsorption towers and the cold fluid outlet of the first heat exchanger for communication, a second electric three-way valve is arranged between the desorption ports of the two active carbon adsorption towers and the air inlet of the liquid ring vacuum pump, and an electric three-way exhaust valve is arranged between the exhaust ports of the two active carbon adsorption towers.
Preferably, the filler in the activated carbon adsorption tower is activated carbon special for oil gas recovery, and the BET of the activated carbon special for oil gas recovery is more than or equal to 1500 square meters per gram and the iodine value is more than or equal to 1000 mg/g.
Preferably, the return pipe is provided with an automatic drain valve.
Preferably, the liquid ring compressor is used for pressurizing gas to 0.2-0.7 Mpa.
Preferably, the first heat exchanger condenses the temperature of the oil gas to 2 ℃, the second heat exchanger condenses the temperature of the oil gas from 2 ℃ to-35 ℃, and the third heat exchanger condenses the temperature of the oil gas from-35 ℃ to-70 ℃.
Preferably, the adsorption system and the desorption system work alternately, and the alternate time is 15-25 min.
The invention has the beneficial effects that:
1. the oil gas is pressurized by adopting the liquid ring compressor, so that the pressurized oil gas does not need to be subjected to complex cooling treatment, and the safety of the oil gas is greatly improved;
2. after the oil gas is pressurized by the liquid ring compressor, the absorption tower and a condensing system are condensed, and the recovery rate of the oil gas is improved; and when the pressure of the oil gas is increased by 0.2-0.7 Mpa, the C2 and C3 molecules can be condensed only by condensing to-70 ℃ so as to recover the C2 and C3 molecules and realize the mg/m of the non-methane total hydrocarbon value3And (4) stage discharge.
3. The condensing system adopts a cascade refrigerating unit which enables the refrigerating system to be more compact, efficient and energy-saving; meanwhile, the cascade refrigerating unit also improves the energy efficiency ratio of refrigeration;
4. the adsorbed oil gas is desorbed by adopting a liquid ring vacuum pump, and the vacuum pump works and cools at the same time, so that the working efficiency of the liquid ring vacuum pump is greatly improved.
Drawings
Fig. 1 is a schematic view of an embodiment of an oil and gas recovery device according to the present invention.
FIG. 2 is a schematic view of the cascade refrigeration unit of FIG. 1
In the figure: 1. a liquid ring compressor; 2. an absorption tower; 3. a first heat exchanger; 4. a first gas-liquid separator; 5. a second heat exchanger; 6. a second gas-liquid separator; 7. a third heat exchanger; 8. a third gas-liquid separator; 9. a cascade refrigeration unit; 10. a first activated carbon adsorption tower; 11. a second activated carbon adsorption tower; 12. an oil pump 13, a scavenge pump; 14. an automatic drain valve; 15. an oil collecting tank; 16. a liquid ring vacuum pump; 17. a second electric three-way valve; 18. a first electric three-way valve; 19. an electric three-way exhaust valve; 20. an oil storage tank; 21. a high temperature stage compressor; 22. a first condenser; 23. a first throttle valve; 24. a condensing evaporator; 25. a low temperature stage compressor; 26. a second condenser; 27. a second throttle valve.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
According to a specific embodiment of the oil gas recovery device of the present invention, as shown in fig. 1, the oil gas recovery device includes an absorption system, a condensation system, an adsorption system, and a desorption system.
The absorption system comprises a liquid ring compressor 1, an absorption tower 2 and an oil storage tank 20, wherein the oil storage tank 20 is provided with a lean absorbent outlet and a rich absorbent inlet, and the lean absorbent outlet of the oil storage tank 20 is communicated with the top of the absorption tower 2 through an oil pump 12 and is communicated with a liquid inlet of the liquid ring compressor 1 to provide a liquid ring for the liquid ring compressor 1. The air inlet of the liquid ring compressor 1 is communicated with an oil gas main air inlet pipeline and is communicated with an air escape port of the oil collecting tank 15 through an air escape pipeline so as to pump out and pressurize oil gas in the oil storage tank 1, the air exhaust port of the liquid ring compressor 1 is communicated with the air inlet of the absorption tower 2, the bottom of the absorption tower 2 is communicated with a return port of the oil collecting tank 15 through a return pipe so as to recover a rich absorbent formed by absorbing oil gas by a poor absorbent, and an automatic liquid discharge valve 14 is arranged on the return pipe. The oil outlet of the oil collecting tank 15 is communicated with the rich absorbent inlet through the oil return pump 13.
The liquid ring compressor 1 is used for pressurizing oil gas to 0.2-0.7 Mpa, and in this embodiment, the operating pressure (the pressure required during normal operation) of the absorption tower 2 is 0.2-0.7 Mpa, so that the oil gas is pressurized to 0.2-0.7 Mpa by the liquid ring compressor 1 and then is conveyed to the absorption tower 2 for absorption. According to the gas-liquid equilibrium relationship in the absorption process, the solubility of solute components can be increased by increasing the pressure, namely, the oil-gas pressurization is more beneficial to the absorption of the absorption tower 1 on the oil gas, and according to the thermodynamic phase equilibrium relationship, the volume of the oil gas can be reduced by increasing the pressure, namely, the oil gas pressurization is more beneficial to the liquefaction of the oil gas by a refrigerating unit. Thereby through pressure boost absorption and pressure boost condensation, improved the rate of recovery of oil gas greatly.
The absorption tower 2 adopts a packing type absorption tower, the poor absorbent is dispersed into a liquid drop state by installing a spraying device (such as a spray header) at the top of the absorption tower 2, a bulk packing or a regular packing is installed at the absorption section (middle part) of the absorption tower 2, the poor absorbent in the liquid drop state is uniformly sprayed from the top of the tower and flows downwards along the surface of the packing, and oil gas rises through gaps among the packing and is in continuous countercurrent contact with the poor absorbent so as to realize the recovery of the oil gas. The effective contact area of the lean absorbent in a liquid drop state and oil gas is increased in the top-down spraying process, so that the recovery rate of the oil gas is improved to a certain extent.
The condensing system comprises a first heat exchanger 3, a first gas-liquid separator 4, a second gas-liquid separator 6, a third gas-liquid separator 8 and a cascade refrigerating unit 9. The cascade refrigeration unit 9 comprises a high-temperature-stage compressor 21, a first condenser 22, a first throttle valve 23, a condensing evaporator 24, a low-temperature-stage compressor 25, a second condenser 26, a second throttle valve 27, a second heat exchanger 5 and a third heat exchanger 7, wherein the high-temperature-stage compressor 21, the first condenser 22, the first throttle valve 23 and the condensing evaporator 24 form a high-temperature-stage refrigeration loop, and the low-temperature-stage compressor 25, the second condenser 26, the condensing evaporator 24, the second throttle valve 27, the second heat exchanger 5 and the third heat exchanger 7 form a low-temperature-stage refrigeration loop. The cascade refrigerating unit 9 not only makes the refrigerating system more compact, efficient and energy-saving, but also improves the energy efficiency ratio of refrigeration.
An exhaust port of the absorption tower 2 is communicated with a hot fluid inlet of the first heat exchanger 3, a hot fluid outlet of the first heat exchanger 3 is communicated with an inlet of the first gas-liquid separator 4, a liquid discharge port of the first gas-liquid separator 4 is communicated with an oil return port of the oil collecting tank 15, a gas outlet of the first gas-liquid separator 4 is communicated with a hot fluid inlet of the second heat exchanger 5, a hot fluid outlet of the second heat exchanger 5 is communicated with an inlet of the second gas-liquid separator 6, a liquid discharge port of the second gas-liquid separator 6 is communicated with an oil return port of the oil collecting tank 15, a gas outlet of the second gas-liquid separator 6 is communicated with a hot fluid inlet of the third heat exchanger 7, a hot fluid outlet of the third heat exchanger 7 is communicated with an inlet of the third gas-liquid separator 8, and a liquid discharge port.
The first heat exchanger 3 condenses the temperature of the oil gas to 2 ℃, the second heat exchanger 5 condenses the temperature of the oil gas from 2 ℃ to-35 ℃, and the third heat exchanger 7 condenses the temperature of the oil gas from-35 ℃ to-70 ℃.
The adsorption system comprises an activated carbon adsorption tower, in the embodiment, the gas outlet of the third gas-liquid separator 8 is communicated with the cold fluid inlet of the first heat exchanger 3, and the cold fluid outlet of the first heat exchanger 3 is communicated with the inlet of the activated carbon adsorption tower. Therefore, the oil gas separated from the third gas-liquid separator 8 and with lower temperature condenses the oil gas in the first heat exchanger, so that the utilization of residual cold is realized, and the energy consumption is further reduced.
In this embodiment, two activated carbon adsorption towers are connected in parallel, which are respectively defined as a first activated carbon adsorption tower 10 and a second activated carbon adsorption tower 11, a first electric three-way valve communication 18 is arranged between the air inlet of the first activated carbon adsorption tower 10 and the air inlet of the second activated carbon adsorption tower 11 and the cold fluid outlet of the first heat exchanger 3, and an electric three-way exhaust valve 19 is arranged between the exhaust port of the first activated carbon adsorption tower 10 and the exhaust port of the second activated carbon adsorption tower 11. Like this when the activated carbon adsorption in first activated carbon adsorption tower 10 reaches the breakthrough point, carry out desorption to first activated carbon adsorption tower 10 and handle, switch over second activated carbon adsorption tower 11 simultaneously and adsorb the processing to oil gas, realized not shutting down and handled the desorption of oil gas, improved work efficiency.
The filler in the first active carbon adsorption tower 10 and the filler in the second active carbon adsorption tower 11 are special active carbon for oil gas recovery, and the BET of the special active carbon for oil gas recovery is more than or equal to 1500 square meters per gram and the iodine value is more than or equal to 1000 mg/g.
The desorption system comprises a liquid ring vacuum pump for desorbing oil gas adsorbed by the activated carbon, a liquid inlet of the liquid ring vacuum pump 16 is communicated with a lean absorbent outlet of the oil storage tank 20 through an oil pump 12, an air inlet of the liquid ring vacuum pump 16 is communicated with a desorption port of the first activated carbon adsorption tower 10 and a desorption port of the second activated carbon adsorption tower 10 through a second electric three-way valve 17, an air outlet of the liquid ring vacuum pump 16 is communicated with an air return port of the oil collection tank 15 so as to introduce the desorbed oil gas into the oil collection tank 15 for recovery, and further the recovery rate of the oil gas is further provided.
And the adsorption system and the desorption system, namely the activated carbon adsorption tower and the liquid ring vacuum pump 16 work alternately for 15-25 min.
The oil gas recovery method of the oil gas recovery device comprises five processes of compression, absorption, condensation, adsorption and desorption, and specifically comprises the following steps:
s1: oil gas in the oil gas main air inlet pipeline is pressurized to 0.2-0.7 Mpa and then is conveyed into the absorption tower 2 through the flame arrester and the liquid ring compressor 1.
S2: the lean absorbent in the oil storage tank 20 is pumped into the absorption tower 2 through the oil pump 12, the lean absorbent is sprayed from top to bottom and flows in the reverse direction with the oil gas in the absorption tower 2 to absorb the oil gas, the lean absorbent absorbs the oil gas to become a rich absorbent, the rich absorbent flows back into the oil collection tank 15 through an oil return pipe, the oil return pipe is provided with an automatic drain valve 14, and the rich absorbent in the oil collection tank 15 is pumped into the oil storage tank 20 through the oil return pump 13.
S3: and introducing the residual oil gas absorbed by the absorption tower 2 into a first heat exchanger 3 to condense the oil gas to 2 ℃.
S4: the oil gas condensed to 2 ℃ is introduced into the first gas-liquid separator 4 for first gas-liquid separation, and the separated liquid is discharged into the oil collecting tank 15.
S5: introducing the oil gas separated from the first gas-liquid separator 4 into a second heat exchanger 5, and condensing the oil gas from 2 ℃ to-35 ℃;
s6: introducing the oil gas condensed to-35 ℃ into a second gas-liquid separator 6 for second gas-liquid separation, and discharging the separated liquid into an oil collecting tank 15;
s7: the oil gas separated from the second gas-liquid separator 6 passes through a third heat exchanger 7, so that the oil gas is condensed from-35 ℃ to-70 ℃, and C2 and C3 molecules in the oil gas can be condensed at-70 ℃ so as to recover C2 and C3 molecules.
S8: and introducing the oil gas condensed to-70 ℃ into a third gas-liquid separator 8 for third gas-liquid separation, and discharging the separated liquid into an oil collecting tank 15.
S9: the oil gas separated by the third gas-liquid separator 8 is firstly introduced into the first heat exchanger 3 from the cold fluid inlet of the first heat exchanger 3, and then introduced into the activated carbon adsorption tower from the cold fluid outlet of the first heat exchanger 3 for adsorption treatment, and the standard-reaching gas after adsorption treatment is discharged from the exhaust port of the activated carbon adsorption tower.
S10: desorbing the oil gas adsorbed by the activated carbon in the activated carbon adsorption tower by a liquid ring vacuum pump 16, introducing the desorbed oil gas into an oil collecting tank 15 for recovery, and communicating an air escape port of the oil collecting tank with an air inlet of a liquid ring compressor through an air escape pipeline.
And the adsorption treatment in the S8 and the desorption treatment in the S8 work alternately for 15-25 min.
The liquid ring of the liquid ring compressor 1 in S1 and the liquid ring of the hydraulic vacuum pump 16 in S10 are formed by the oil pump 12 pumping in the lean absorbent in the oil storage tank 20.
In other embodiments, the gas outlet of the third gas-liquid separator can also be directly communicated with the gas inlet of the activated carbon adsorption tower; one active carbon adsorption tower can be arranged; the filler in the activated carbon adsorption tower can also be activated carbon with other types (BET and iodine values).
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides an oil gas recovery device, includes absorption system, condensing system, its characterized in that: the device also comprises an adsorption system and a desorption system;
the absorption system comprises an absorption tower, a liquid ring compressor and an oil storage tank, wherein the oil storage tank is provided with a lean absorbent outlet and a rich absorbent inlet, the lean absorbent outlet of the oil storage tank is respectively communicated with the top of the absorption tower and the liquid inlet of the liquid ring compressor through an oil pump, the gas inlet of the liquid ring compressor is communicated with a main oil gas inlet pipeline, the gas outlet of the liquid ring compressor is communicated with the gas inlet of the absorption tower, the bottom of the absorption tower is communicated with the reflux port of the oil collection tank through a reflux pipe, and the oil outlet of the oil collection tank is communicated with the rich absorbent inlet of the oil storage tank through an oil return pump;
the condensing system comprises a first heat exchanger, a first gas-liquid separator, a second gas-liquid separator, a third gas-liquid separator and a cascade refrigerating unit, the cascade refrigerating unit comprises a high-temperature-stage compressor, a first condenser, a first throttling valve, a condensing evaporator, a low-temperature-stage compressor, a second condenser, a second throttling valve, a second heat exchanger and a third heat exchanger, the high-temperature-stage compressor, the first condenser, the first throttling valve and the condensing evaporator form a high-temperature-stage refrigerating loop, the low-temperature-stage compressor, the second condenser, the second throttling valve of the condensing evaporator, the second heat exchanger and the third heat exchanger form a low-temperature-stage refrigerating loop, an exhaust port of an absorption tower is communicated with a hot fluid inlet of the first heat exchanger, a hot fluid outlet of the first heat exchanger is communicated with an inlet of the first gas-liquid separator, a fluid outlet of the first gas-liquid separator is communicated, the gas outlet of the first gas-liquid separator is communicated with the hot fluid inlet of the second heat exchanger, the hot fluid outlet of the second heat exchanger is communicated with the inlet of the second gas-liquid separator, the liquid outlet of the second gas-liquid separator is communicated with the oil return port of the oil collecting tank, the gas outlet of the second gas-liquid separator is communicated with the hot fluid inlet of the third heat exchanger, the hot fluid outlet of the third heat exchanger is communicated with the inlet of the third gas-liquid separator, and the liquid outlet of the third gas-liquid separator is communicated with the oil return port of the oil collecting tank;
the adsorption system comprises an activated carbon adsorption tower, and a gas inlet of the activated carbon adsorption tower is communicated with a gas outlet of the third gas-liquid separator;
the desorption system comprises a liquid ring vacuum pump, a liquid inlet of the liquid ring vacuum pump is communicated with a lean absorbent outlet of the oil storage tank through an oil pump, a gas inlet of the liquid ring vacuum pump is communicated with a desorption port of the adsorption tower, a gas outlet of the liquid ring vacuum pump is communicated with a gas return port of the oil collection tank, and a gas escape port of the oil collection tank is communicated with a gas inlet of the liquid ring compressor through a gas escape pipeline.
2. The oil and gas recovery device according to claim 1, characterized in that: and a gas outlet of the third gas-liquid separator is communicated with a cold fluid inlet of the first heat exchanger, and a cold fluid outlet of the first heat exchanger is communicated with an inlet of the activated carbon adsorption tower.
3. The oil and gas recovery device according to claim 2, characterized in that: the active carbon adsorption tower connects in parallel and sets up two, is equipped with first electronic three-way valve intercommunication between the air inlet of two active carbon adsorption towers and the cold fluid outlet of first heat exchanger, is equipped with the electronic three-way valve of second between desorption mouth and the air inlet of liquid ring vacuum pump of two active carbon adsorption towers, is equipped with electronic three-way discharge valve between the gas vent of two active carbon adsorption towers.
4. The oil and gas recovery device according to claim 3, characterized in that: the filler in the activated carbon adsorption tower is activated carbon special for oil gas recovery, and the BET of the activated carbon special for oil gas recovery is more than or equal to 1500 square meters per gram and the iodine value is more than or equal to 1000 mg/g.
5. The oil and gas recovery device according to claim 1, characterized in that: and an automatic drain valve is arranged on the return pipe.
6. The oil and gas recovery device according to any one of claims 1 to 5, wherein: the liquid ring compressor is used for pressurizing gas to 0.2-0.7 Mpa.
7. The oil and gas recovery device according to any one of claims 1 to 5, characterized in that: the first heat exchanger condenses the temperature of the oil gas to 2 ℃, the second heat exchanger condenses the temperature of the oil gas from 2 ℃ to-35 ℃, and the third heat exchanger condenses the temperature of the oil gas from-35 ℃ to-70 ℃.
8. The oil and gas recovery device according to any one of claims 1 to 5, wherein: the adsorption system and the desorption system work alternately, and the alternate time is 15-25 min.
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