CN113713791A - Adsorbent regeneration method and oil gas recovery system - Google Patents
Adsorbent regeneration method and oil gas recovery system Download PDFInfo
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- CN113713791A CN113713791A CN202110617636.0A CN202110617636A CN113713791A CN 113713791 A CN113713791 A CN 113713791A CN 202110617636 A CN202110617636 A CN 202110617636A CN 113713791 A CN113713791 A CN 113713791A
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/3483—Regenerating or reactivating by thermal treatment not covered by groups B01J20/3441 - B01J20/3475, e.g. by heating or cooling
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/3416—Regenerating or reactivating of sorbents or filter aids comprising free carbon, e.g. activated carbon
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Abstract
The invention relates to an adsorbent regeneration method and an oil gas recovery system, the adsorbent regeneration method is used in an organic solvent waste gas discharge recovery process, the discharge recovery process comprises that a raw material gas enters an adsorption tower after passing through a refrigerant evaporator, and the adsorbent regeneration method comprises the following operations: the refrigerant is evaporated and then enters the compressor to raise the pressure and temperature of the refrigerant, and the heat of the refrigerant is utilized to carry out heat exchange and temperature rise on the regenerated gas flowing to the refrigerant evaporator, so that the regenerated gas flowing to the adsorption tower is heated. The method improves the long-time heat transfer effect of the refrigerant evaporator of the condensing unit, and ensures that VOCs such as gasoline and diesel oil and the like are condensed to a specified temperature; meanwhile, the regeneration effect of the adsorbent such as activated carbon is improved, the secondary adsorption efficiency is high, and the high temperature generated at the outlet of the refrigerant compressor is utilized for recovery in the whole process, so that the environment-friendly treatment effect is achieved.
Description
Technical Field
The invention relates to an adsorbent regeneration method and an oil gas recovery system, and also relates to an oil gas recovery system.
Background
At present, atmospheric pollution troubles human life, and the national environmental protection policy requires that pollutant emission gas can be discharged after being treated.
Organic solvents such as gasoline and diesel belong to the group of VOCs, which is the acronym for volatile organic compounds (VOLATILE ORGANIC COMPOUNDS). In China, VOCs refer to organic compounds with saturated vapor pressure of more than 70Pa at normal temperature and boiling point of less than 260 ℃ at normal pressure, or all organic compounds with corresponding volatility and vapor pressure of more than or equal to 10Pa at 20 ℃.
VOCs have volatility, and are easy to volatilize at normal temperature to form VOCs gas, VOCs and nitrogen oxide generate photochemical reaction to generate secondary organic pollutants such as O3, peroxyacetyl nitrate and the like, and the secondary organic pollutants form high-oxidability mixed gas mass to become photochemical smog and aerosol at the same time. Many urban photochemical smog cause greater harm to human health. In addition, the aerosol is one of the precursors of the particulate matter PM2.5, and is an important reason for causing haze.
Therefore, the national environmental protection requires that the pollution source emission can be treated and then discharged to the atmosphere so as to reduce the pollution capacity of the atmosphere, maintain good atmospheric environment and be beneficial to the health of people.
Volatile organic pollution sources such as Volatile Organic Compounds (VOCs) such as gasoline and diesel oil are volatilized in the storage and filling processes, during the storage process, the storage tank is in the liquid inlet process, and along with the rising of the liquid level, the volatile VOCs such as gasoline and diesel oil at the top of the storage tank are discharged from the breather valve to form the pollution sources; in the filling process, namely when VOCs such as gasoline and diesel oil enter the oil filling pipe and the tank car in the loading process, the VOCs such as gasoline and diesel oil are discharged to form a waste gas pollution source. These waste gas pollution sources discharge the atmosphere, cause the atmospheric pollution, must administer, mainly adopt condensation + adsorption technique at present, this technique utilizes steam compression refrigeration to provide the cold source, utilize the cold source to carry out the cooling condensation with organic solvent VOCs waste gas such as gasoline and diesel oil, become liquid by the gaseous state, pollutant greatly reduced in the waste gas noncondensable gas after the condensation, let in waste gas noncondensable gas in the active carbon again and adsorb, change over the pollutant in the noncondensable gas of waste gas into the solid, waste gas can reach emission standard this moment, qualified emission to the atmosphere, but present condensation + adsorption technique adopts normal atmospheric temperature vacuum desorption, because the high normal atmospheric temperature regeneration effect of gasoline and diesel oil organic matter boiling point is poor, lead to active carbon adsorption efficiency very low once more.
Disclosure of Invention
It is an object of the present invention to provide a better method for regenerating an adsorbent.
In order to achieve the above object, the present application provides an adsorbent regeneration method for use in an organic solvent waste gas discharge recovery process, the discharge recovery process comprising passing a raw gas through a refrigerant evaporator and then entering an adsorption column, the adsorbent regeneration method comprising the operations of: the refrigerant is evaporated and then enters the compressor to raise the pressure and temperature of the refrigerant, and the heat of the refrigerant is utilized to carry out heat exchange and temperature rise on the regenerated gas flowing to the refrigerant evaporator, so that the regenerated gas flowing to the adsorption tower is heated.
At present, VOCs tank districts such as gasoline and diesel oil are treated with filling, on-site conditions and safety are considered, a condensation + adsorption technology is mainly adopted, a cold source is provided by utilizing steam compression refrigeration, organic solvent VOCs waste gas such as gasoline and diesel oil is cooled and condensed by utilizing the cold source, and the gas state is changed into a liquid state. The pollutants in the condensed waste gas non-condensable gas are greatly reduced, but the emission requirement cannot be met, then the waste gas non-condensable gas is introduced into the activated carbon for adsorption, the pollutants in the waste gas non-condensable gas are transferred into a solid, and the waste gas can reach the emission standard and is emitted to the atmosphere in a qualified mode. After the activated carbon is saturated, vacuum desorption is carried out, organic matters such as gasoline and diesel oil adsorbed by the activated carbon are desorbed and returned to the steam compression refrigeration inlet for recycling and condensation. The condensation temperature of the technology is critical, the condensation temperature is converted into partial pressure according to the emission concentration of the emission required component, and then the corresponding saturation temperature is found out according to the partial pressure (saturated vapor pressure), namely the condensation temperature. The lower the condensation temperature, the less contaminants in the non-condensable gas. But the lower the temperature, the greater the increase in system power consumption. Therefore, it is generally selected to be between-20 ℃ and-90 ℃.
Because the existing condensation and adsorption technology has a low-temperature evaporation process, the viscosity of organic matters such as gasoline and diesel oil and water is increased after the organic matters and the water form an ice point, and the heat exchange effect of a refrigerant evaporator is low after the operation is carried out for a period of time, so that the organic matters such as gasoline and diesel oil can not be condensed. In the prior art, normal-temperature nitrogen is supplemented for defrosting generally, but the defrosting effect is poor, and the heat exchange effect of a refrigerant evaporator is poor.In addition, normal-temperature vacuum desorption is adopted for adsorption at the rear end of condensation, and the secondary adsorption efficiency of the activated carbon is very low due to the poor normal-temperature regeneration effect of high boiling points of gasoline and diesel organic matters. Based on the two defects, the existing condensation and adsorption technology is found to basically meet the emission concentration 25g/m required by oil gas recovery equipment only after long-term operation3And the long-term operation is difficult to reach the national standard and the industrial standard.
The method of the invention improves the long-time heat transfer effect of the refrigerant evaporator of the condensing unit, and ensures that VOCs such as gasoline and diesel oil are condensed to a specified temperature; meanwhile, the regeneration effect of the adsorbent such as activated carbon is improved, the secondary adsorption efficiency is high, and the high temperature generated at the outlet of the refrigerant compressor is utilized for recovery in the whole process, so that the environment-friendly treatment effect is achieved. The regeneration gas adopted by the method can adopt nitrogen.
Specifically, the temperature rise of the refrigerant is increased after the refrigerant is compressed by the compressor.
The refrigerant compression outlet of the condensing unit is specially selected as a heat absorption heat source of the refrigerant (a heat exchange medium in figure 3), so that the refrigerant can absorb higher heat, the regenerant and the adsorbate can be fully separated, and the safety of the regenerant is guaranteed. The temperature of the refrigerant rises after being compressed by the compressor; the high-temperature high-pressure refrigerant at the outlet of the compressor exchanges heat with the regeneration gas flowing to the refrigerant evaporator to ensure that the regeneration gas reaches more than 80 ℃, more than 81 ℃, more than 82 ℃, more than 83 ℃, more than 84 ℃, more than 85 ℃, more than 86 ℃, more than 87 ℃, more than 88 ℃, more than 89 ℃ or more than 90 ℃ and less than 110 ℃.
Specifically, the adsorbent regeneration method comprises the steps of arranging two heat exchangers, heating two paths of input regeneration gas respectively by the two heat exchangers, and connecting the two heat exchangers in series by a pipeline where the refrigerant is located.
Besides the arrangement mode, the pipeline where the refrigerant is located can also be connected with the two heat exchangers in parallel.
Whether series or parallel is used here depends on the particular installation requirements, such as the amount of regeneration gas introduced, the spatial constraints of the heat exchanger arrangement, etc.
Specifically, the refrigerant exchanges heat with the regenerated gas flowing to the adsorption tower, and then exchanges heat with the refrigerant after temperature rise again, and then the regenerated gas flows back to the raw material gas inlet end of the refrigerant evaporator to be mixed with the raw material gas entering the refrigerant evaporator, so that the regenerated gas circularly flows between the refrigerant evaporator and the adsorption tower.
Namely, after the heat of the regenerated gas is transferred to the adsorbent, the regenerated gas and the adsorbed substances are output from the adsorption tower together, the temperature of the regenerated gas and the temperature of the adsorbed substances are reduced, the regenerated gas is heated again and then enters the adsorption tower, the cycle is kept until the regeneration of the adsorbent is completed, the high-concentration regenerated gas (the high-concentration regenerated gas is the regenerated gas containing gaseous organic solvent) after the desorption is completed is mixed with the raw material gas, and then the mixture enters the refrigerant evaporator again for condensation.
And further, introducing the regenerated gas subjected to heat exchange into an adsorption tower for heating regeneration, separating the adsorbed substances in the adsorption tower from the adsorbent to change the adsorbed substances into a gaseous state, mixing the adsorbed substances changed into the gaseous state with the regenerated gas, and refluxing to the feed gas inlet end of the refrigerant evaporator.
Furthermore, the compressed high-temperature and high-pressure refrigerant heats up the regeneration gas, and the heated regeneration gas enters the evaporator for defrosting, so that the heat exchange efficiency of the evaporator is improved. The regeneration gas can be nitrogen or carbon dioxide.
The invention also provides an oil gas recovery system for improving the regeneration effect of the adsorbent, which comprises a refrigerant evaporator, an adsorption tower and a refrigeration compressor, wherein oil gas raw material gas enters the adsorption tower through the refrigerant evaporator and then is recovered; the oil gas recovery system also comprises two heat exchangers, wherein the two heat exchangers are connected with a regeneration gas pipeline communicated with the refrigerant evaporator and the adsorption tower and used for heating the regeneration gas.
By adopting the oil gas recovery system, the oil gas can be recovered more fully, meanwhile, the adsorbent can be recycled better, the adsorbent can be ensured to be in higher adsorption efficiency for a longer time, and the oil gas recovery system can run for a long time and has operating efficiency reaching and exceeding the industrial requirements.
Furthermore, the regeneration gas pipeline comprises a defrosting pipeline and a desorption pipeline, and the defrosting pipeline and the desorption pipeline respectively pass through one heat exchanger; the defrosting pipeline is communicated with the refrigerant evaporator and is used for heating viscous substances attached to the inner wall of the refrigerant evaporator; the desorption pipeline is communicated with the adsorption tower and is used for heating the adsorbent or the adsorption substance in the adsorption tower.
The defrosting pipeline and the desorption pipeline arranged in the oil gas recovery system operate simultaneously, high-temperature heat of a refrigerant compression outlet of a condensing unit is recovered, a heat exchanger exchanges heat at the high temperature of the refrigerant compression outlet to heat regenerated gas, and an adsorbent such as activated carbon is removed for desorption and regeneration after the temperature of the regenerated gas is raised, so that the desorption and regeneration effects of the activated carbon are greatly improved; the other heat exchanger exchanges heat with high temperature at a refrigerant compression outlet to heat the defrosting regeneration gas, the refrigerant evaporator is introduced to heat the refrigerant evaporator, organic matters such as gasoline and diesel oil and ice are defrosted, and the heat transfer capacity is recovered after the refrigerant evaporator is defrosted, so that the condensation effect can be ensured.
Furthermore, a refrigerant pipeline of the refrigerant evaporator connects the refrigerant evaporator, the refrigeration compressor and a heat exchanger group formed by two heat exchangers in sequence to form a refrigerant loop, and a refrigerant inlet of the refrigerant evaporator is provided with a control valve.
Further, the adsorption tower comprises two tank bodies, one tank body is connected with a regenerated gas pipeline, a discharge port of the adsorption tower is arranged on the other tank body, and the evaporator is connected with the two tank bodies in parallel.
And further, the refrigerant outlets of the two heat exchangers are connected with air coolers.
The invention is further described with reference to the following figures and detailed description. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description. Or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to assist in understanding the invention, and are included to explain the invention and their equivalents and not limit it unduly. In the drawings:
FIG. 1 is a schematic flow chart for explaining a method for regenerating an adsorbent according to the first embodiment;
FIG. 2 is a schematic flow chart for explaining the regeneration method of the adsorbent according to the second embodiment;
FIG. 3 is a schematic diagram illustrating the present oil and gas recovery system;
labeled as: : 1-refrigerant evaporator, 2-adsorption tower, 3-refrigeration compressor, 4-heat exchanger, 5-defrosting pipeline, 6-desorption pipeline, 7-air cooler and 8-nitrogen loop.
Detailed Description
The invention will be described more fully hereinafter with reference to the accompanying drawings. Those skilled in the art will be able to implement the invention based on these teachings. Before the present invention is described in detail with reference to the accompanying drawings, it is to be noted that:
the technical solutions and features provided in the present invention in the respective sections including the following description may be combined with each other without conflict.
Moreover, the embodiments of the present invention described in the following description are generally only some embodiments of the present invention, and not all embodiments. Therefore, all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.
With respect to terms and units in the present invention. The term "comprises" and any variations thereof in the description and claims of this invention and the related sections are intended to cover non-exclusive inclusions.
Referring to fig. 1, in the first embodiment: an adsorbent regeneration method is used in an oil and gas emission recovery process, the emission recovery process comprises that raw material gas enters an adsorption tower after passing through a refrigerant evaporator under the driving of a fan, an adsorbent in the adsorption tower is activated carbon, in the embodiment, nitrogen is used as regeneration gas to regenerate the activated carbon, and the adsorbent regeneration method comprises the following operations:
s1.1, defrosting nitrogen heat exchange: heating the nitrogen to raise the temperature, wherein the heat comes from a high-temperature refrigerant at the outlet of the refrigeration compressor;
s1.2, desorbing nitrogen and heating: heating the nitrogen to raise the temperature, wherein the heat comes from a high-temperature refrigerant at the outlet of the refrigeration compressor;
s2.1, defrosting: the heated nitrogen enters the refrigerant evaporator to heat the viscous substance attached to the inner wall of the refrigerant evaporator, and the viscosity of the viscous substance is reduced after the temperature of the viscous substance is raised, so that the defrosting purpose is achieved;
s2.2, desorbing the adsorbent by using hot nitrogen: the heated nitrogen enters an adsorption tower, the adsorbent is heated by hot nitrogen, and after the adsorbent is heated, adsorbed substances are separated from an active center of the adsorbent and enter a gas state through a pore channel, so that the adsorbent is regenerated;
s3a, desorption and regeneration of nitrogen circulation: after the heat of the nitrogen is transferred to the adsorbent, the nitrogen and the adsorbed substances come out of the adsorption tower together, the temperature is reduced, the regenerated gas is heated again, and then enters the adsorption tower after being heated, the circulation is carried out until the regeneration of the adsorbent is completed, the high-concentration regenerated gas after the desorption is mixed with the feed gas, and then the regenerated gas enters the refrigerant evaporator again for condensation.
Referring to fig. 2, embodiment two: unlike the first embodiment, in the present desorption regeneration nitrogen cycle, step S3b is performed:
s3b, desorption and regeneration of nitrogen circulation: and after the heat of the nitrogen is transferred to the adsorbent, the nitrogen and the adsorbed substances come out of the adsorption tower together, the temperature is reduced, the regenerated gas is heated again, part of heated nitrogen enters the adsorption tower again after being heated, the nitrogen circulates all the time, and the other part of heated high-concentration nitrogen is mixed with the feed gas and enters the refrigerant evaporator again for condensation.
In the above two embodiments, the opening and closing of the pipeline are controlled by different valve controls. During specific control, an oil gas concentration detector can be arranged on a pipeline between the adsorption tower and the heat exchanger, and when the concentration reaches a preset standard, a nitrogen pipeline which is returned to the evaporator by the adsorption tower is opened.
The method in the embodiment improves the long-time heat transfer effect of the refrigerant evaporator of the condensing unit, and ensures that VOCs such as gasoline and diesel oil are condensed to a specified temperature; meanwhile, the regeneration effect of the adsorbent such as activated carbon is improved, the secondary adsorption efficiency is high, and the high temperature generated at the outlet of the refrigerant compressor is utilized for recovery in the whole process, so that the environment-friendly treatment effect is achieved. The regeneration gas adopted by the method can adopt nitrogen.
The two heat exchangers are connected in series on a pipeline where the refrigerant is located, and can be connected in series or in parallel.
Referring to fig. 3, in the present embodiment, an oil gas recovery system is adopted, which includes a refrigerant evaporator 1 and an adsorption tower 2, an oil gas raw material gas enters the adsorption tower 2 through the refrigerant evaporator 1 to recover oil gas, and the oil gas recovery system further includes a refrigeration compressor 3, wherein a refrigerant pipeline of the refrigerant evaporator 1 is in heat conduction connection with the refrigeration compressor 3, and is used for heating a refrigerant through the refrigeration compressor 3; the oil gas recovery system also comprises two heat exchangers 4, wherein the two heat exchangers 4 are connected with a regeneration gas pipeline communicated with the refrigerant evaporator 1 and the adsorption tower 2 and used for heating the regeneration gas. The nitrogen mixture in the adsorption tower 2 is returned to the inlet end of the refrigerant evaporator 1 through the nitrogen loop 8 line, and condensed again.
By adopting the oil gas recovery system, the oil gas can be recovered more fully, meanwhile, the adsorbent can be recycled better, the adsorbent can be ensured to be in higher adsorption efficiency for a longer time, and the oil gas recovery system can run for a long time and has operating efficiency reaching and exceeding the industrial requirements.
Preferably, the adsorption tower 2 can be provided with two tank bodies, one tank body is used as a node in the nitrogen circulation route, the other tank body is used as a tail end tank body in the final discharge process, and the tail end tank body does not participate in the nitrogen circulation route, so that the reliable operation of the adsorption tower 2 can be effectively guaranteed, and the maintenance is convenient.
The regeneration gas pipeline comprises a defrosting pipeline 5 and a desorption pipeline 6, and the defrosting pipeline 5 and the desorption pipeline 6 respectively pass through one heat exchanger 4; the defrosting pipeline 5 is communicated with the refrigerant evaporator 1 and is used for heating viscous substances attached to the inner wall of the refrigerant evaporator 1; the desorption pipeline 6 is communicated with the adsorption tower 2 and used for heating the adsorbent or the adsorption substance in the adsorption tower 2.
The defrosting pipeline 5 and the desorption pipeline 6 arranged in the oil gas recovery system operate simultaneously, high-temperature heat at a refrigerant compression outlet of a condensing unit is utilized for recovering, a heat exchanger 4 exchanges heat at the high temperature of the refrigerant compression outlet to heat regenerated gas, and adsorbent such as activated carbon is removed for desorption and regeneration after the temperature of the regenerated gas is raised, so that the desorption and regeneration effects of the activated carbon are greatly improved; the other heat exchanger 4 exchanges heat with high temperature at a refrigerant compression outlet to heat the defrosted regeneration gas, the refrigerant evaporator 1 is introduced to heat the refrigerant evaporator 1, organic matters such as gasoline and diesel oil and ice are defrosted, and the heat transfer capacity is recovered after the refrigerant evaporator 1 is defrosted, so that the condensation effect can be ensured.
A refrigerant pipeline of the refrigerant evaporator 1 connects a refrigerant evaporator 1, a refrigeration compressor 3 and a heat exchanger 4 group formed by two heat exchangers 4 in sequence to form a refrigerant loop, and a refrigerant inlet of the refrigerant evaporator 1 is provided with a control valve. And refrigerant outlets of the two heat exchangers 4 are connected with air coolers 7, so that the refrigerant before entering the refrigerant evaporator 1 is cooled.
The contents of the present invention have been explained above. Those skilled in the art will be able to implement the invention based on these teachings. All other embodiments, which can be derived by a person skilled in the art from the above description without inventive step, shall fall within the scope of protection of the present invention.
Claims (10)
1. An adsorbent regeneration method, which is used in an exhaust recovery process of organic solvent waste gas, the exhaust recovery process comprises passing a raw gas through a refrigerant evaporator and then entering an adsorption tower, the adsorbent regeneration method comprises the following operations: the refrigerant is evaporated and then enters the compressor to raise the pressure and temperature of the refrigerant, and the heat of the refrigerant is utilized to carry out heat exchange and temperature rise on the regenerated gas flowing to the refrigerant evaporator, so that the regenerated gas flowing to the adsorption tower is heated.
2. A method of regenerating an adsorbent as set forth in claim 1, characterized in that said refrigerant is compressed by a compressor and then increases in temperature; the high-temperature high-pressure refrigerant at the outlet of the compressor exchanges heat with the regeneration gas flowing to the refrigerant evaporator to ensure that the regeneration gas reaches more than 80 ℃, more than 81 ℃, more than 82 ℃, more than 83 ℃, more than 84 ℃, more than 85 ℃, more than 86 ℃, more than 87 ℃, more than 88 ℃, more than 89 ℃ or more than 90 ℃ and less than 110 ℃.
3. The method of claim 1, including providing two heat exchangers for separately heating the incoming regeneration gas, the refrigerant line connecting the two heat exchangers in series.
4. The method for regenerating the adsorbent according to claim 1, wherein two heat exchangers are provided, the two heat exchangers respectively heat the two paths of the regeneration gas, and the refrigerant pipeline is connected in parallel with the two heat exchangers.
5. The method for regenerating an adsorbent as claimed in claim 1, wherein the regenerated gas after heat exchange is introduced into the adsorption tower to be heated and regenerated, the adsorbent in the adsorption tower is separated from the adsorbent to turn the adsorbent into a gaseous state, and the adsorbent turned into the gaseous state is mixed with the regenerated gas and then refluxed to the raw material inlet end of the refrigerant evaporator.
6. The method of claim 1, wherein the compressed high temperature and high pressure refrigerant is used to warm the regeneration gas, and the warmed regeneration gas is passed to a refrigerant evaporator for defrosting.
7. The oil gas recovery system comprises a refrigerant evaporator and an adsorption tower, wherein oil gas raw materials enter the adsorption tower through the refrigerant evaporator and then are recovered; the oil gas recovery system also comprises two heat exchangers, wherein the two heat exchangers are connected with a regeneration gas pipeline communicated with the refrigerant evaporator and the adsorption tower and used for heating the regeneration gas.
8. The vapor recovery system of claim 7, wherein said regeneration gas line comprises a defrost line and a desorption line, said defrost line and desorption line each passing through one of said heat exchangers; the defrosting pipeline is communicated with the refrigerant evaporator and is used for heating viscous substances attached to the inner wall of the refrigerant evaporator; the desorption pipeline is communicated with the adsorption tower and is used for heating the adsorbent or the adsorption substance in the adsorption tower.
9. The oil and gas recovery system as set forth in claim 7, wherein the refrigerant line of said refrigerant evaporator connects the refrigerant evaporator, the refrigerant compressor, and the heat exchanger group formed by two heat exchangers in sequence to form a refrigerant circuit, and the inlet of said refrigerant line is provided with a control valve.
10. The oil and gas recovery system of claim 7, wherein the adsorption tower comprises two tanks, one tank being connected to the regeneration gas line, the discharge port of the adsorption tower being disposed on the other tank, and the evaporator being connected in parallel to the two tanks.
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