CN111575042B - Combined oil gas recovery device and recovery process - Google Patents
Combined oil gas recovery device and recovery process Download PDFInfo
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- CN111575042B CN111575042B CN202010530280.2A CN202010530280A CN111575042B CN 111575042 B CN111575042 B CN 111575042B CN 202010530280 A CN202010530280 A CN 202010530280A CN 111575042 B CN111575042 B CN 111575042B
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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
- C10G5/00—Recovery of liquid hydrocarbon mixtures from gases, e.g. natural gas
- C10G5/04—Recovery of liquid hydrocarbon mixtures from gases, e.g. natural gas with liquid absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B01D53/02—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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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B01D53/14—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 absorption
- B01D53/1487—Removing organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B01D53/14—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 absorption
- B01D53/1493—Selection of liquid materials for use as absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B01D53/14—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 absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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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
- C10G5/00—Recovery of liquid hydrocarbon mixtures from gases, e.g. natural gas
- C10G5/02—Recovery of liquid hydrocarbon mixtures from gases, e.g. natural gas with solid adsorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/20—Organic absorbents
- B01D2252/205—Other organic compounds not covered by B01D2252/00 - B01D2252/20494
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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Abstract
A combined oil gas recovery device and a recovery process, wherein the combined oil gas recovery device comprises an absorbent input system, a first absorption system, a second absorption system and an adsorption system; the absorbent input system comprises a heavy hydrocarbon oil gas absorbent, a light hydrocarbon oil gas absorbent input end, an oil depot I, an oil depot II, a first power pump and a second power pump; the first absorption system and the second absorption system comprise an absorption tower A and an absorption tower B; the adsorption system comprises two adsorption tanks, a four-way reversing valve and a vacuum pump. This combination oil gas recovery's process method utilizes two-stage absorption system and the adsorption system who comprises two adsorption tanks, separates the absorption to heavy hydrocarbon class macromolecule oil gas and light hydrocarbon class micromolecule oil gas in the combination oil gas to the circulation circuit circulation that forms through adsorption system and second absorption system adsorbs absorption light hydrocarbon micromolecule oil gas, and recovery efficiency is high, and two adsorption tanks realize adsorbing and desorbing the switching of function simultaneously, guarantee adsorption system continuous operation, improve work efficiency.
Description
Technical Field
The invention belongs to the technical field of oil gas recovery, and particularly relates to a combined oil gas recovery device and a recovery process.
Background
With the development of economy and industry, the use of petroleum series products is rapidly increased, the petroleum series products have strong volatility, are volatilized in the storage and transportation processes to generate a large amount of oil gas, so that the loss and the waste are caused, the oil gas is directly discharged into the atmosphere to cause environmental pollution, the volatilized oil gas needs to be collected, the oil gas comprises a plurality of hydrocarbon organic compounds, and chemical smoke can be formed due to improper treatment, so that the safety production is endangered, and the environment is polluted. In recent years, research and engineering on oil gas recovery and utilization are receiving wide attention, and in order to meet the national oil gas emission standard, an oil gas recovery processing device must be installed to recover and process light hydrocarbon components in oil gas, and the existing oil gas processing methods include four methods, namely a condensation method, an absorption method, an adsorption method and a membrane separation method.
The oil gas recovery technology of 'adsorption/absorption' has been developed by americans for a long time, and currently, both america and europe have application of an oil gas recovery processing technology of an adsorption/absorption combined process, although the technology is simple in process and good in oil gas processing effect, the overall adsorption effect of an adsorbent is strictly examined, when the adsorbent starts to adsorb oil gas, heavy hydrocarbon macromolecules in the oil gas are embedded into pores of the adsorbent, so that most of light hydrocarbon micromolecule oil gas cannot be smoothly adsorbed, but the combined oil gas is difficult to avoid the existence of both heavy hydrocarbon macromolecule oil gas and light hydrocarbon micromolecule oil gas, so that the existing 'adsorption/absorption' oil gas recovery technology cannot well realize the absorption of the light hydrocarbon molecule oil gas, and the separation effect is not ideal. In addition, most light hydrocarbon components in oil gas can be liquefied and recovered by the existing condensation method, but increasingly strict national standards and local emission standards are required to be met, high deep cooling is required, great power consumption cost is required to be paid by the mode, and the production cost of enterprises is increased, so that the problem that the production enterprises are urgently required to solve is to design a novel oil gas recovery device which is economical, efficient and compact in structure.
Disclosure of Invention
The invention aims to design a combined oil-gas recovery device and a recovery process, the device utilizes a two-stage absorption system and an absorption system consisting of two absorption tanks to separate the combined oil-gas of heavy hydrocarbon macromolecule oil-gas and light hydrocarbon micromolecule oil-gas, a circulation loop formed by the absorption system and a second absorption system firstly separates heavy hydrocarbon macromolecule in the combined oil-gas and then circularly and repeatedly absorbs the light hydrocarbon micromolecule oil-gas, thereby improving the recovery efficiency of the light hydrocarbon micromolecule oil-gas and realizing the separation and recovery of the combined oil-gas.
The purpose of the invention can be realized by adopting the following technical scheme: a combined oil gas recovery device and a recovery process are provided, wherein the combined oil gas recovery device is arranged beside an oil refinery and comprises an absorbent input system, a first absorption system, a second absorption system, an adsorption system and an oil storage tank; the absorbent input system comprises a heavy hydrocarbon oil gas absorbent input end, a light hydrocarbon oil gas absorbent input end, an oil depot I, an oil depot II, a first power pump and a second power pump, and is respectively connected with the first absorption system and the second absorption system through the first power pump and the second power pump; the first absorption system comprises an absorption tower A, a third power pump and a first liquid level meter, the second absorption system comprises an absorption tower B, a fourth power pump and a second liquid level meter, and the first absorption system and the second absorption system are connected with the oil storage tank through the third power pump and the fourth power pump; the adsorption system comprises a first adsorption tank, a second adsorption tank, a condensate separation tank, a four-way reversing valve, an electromagnetic three-way valve and a vacuum pump, and is communicated with the first absorption system and the second absorption system through the condensate separation tank and the vacuum pump; the oil storage tank is arranged between the oil depot I and the oil depot II and is respectively communicated with the oil depot I and the oil depot II and an oil refinery.
The heavy hydrocarbon oil gas absorbent input end is arranged on an oil depot I, the oil depot I is used for storing heavy diesel oil, an oil gas inlet of the oil depot I is connected with an oil refinery, the first power pump is arranged between the oil depot I and an absorption tower A of a first absorption system, one end of the first power pump is connected with the heavy hydrocarbon oil gas absorbent input end, and the other end of the first power pump is connected with the absorption tower A; the input end of the light hydrocarbon oil gas absorbent is arranged on an oil depot II, the oil depot II is used for storing light diesel oil, and an oil gas inlet of the oil depot II is connected with an oil refinery; and the second power pump is arranged between the oil depot II and the absorption tower B of the second absorption system, one end of the second power pump is connected with the input end of the light hydrocarbon oil gas absorbent, and the other end of the second power pump is connected with the absorption tower B.
The absorption tower A is provided with a first oil gas inlet, a first absorbent inlet, a heavy hydrocarbon oil gas outlet and a first light hydrocarbon oil gas outlet; the first absorbent inlet is positioned above the absorption tower A, the first light hydrocarbon oil gas outlet is arranged at the top end of the absorption tower A and positioned above the first absorbent inlet, and the heavy hydrocarbon oil gas outlet is arranged below the absorption tower A; first oil gas entry and outside oil gas pipe connection, first absorbent entry are connected with the output of first power pump, and the heavy hydrocarbon oil gas export is connected with the oil storage tank through the third power pump, and first light hydrocarbon oil gas export is connected with adsorption system's condensate separation tank.
The absorption tower B is provided with a second oil gas inlet, a second absorbent inlet, a light hydrocarbon oil gas circulation outlet and a second light hydrocarbon oil gas outlet; the second absorbent inlet is positioned above the absorption tower B, and the light hydrocarbon oil-gas circulation outlet is arranged at the top end of the absorption tower B and positioned above the second absorbent inlet; the second oil gas inlet is communicated with the adsorption system, the second absorbent inlet is connected with the output end of the second power pump, the light hydrocarbon oil gas circulation outlet is communicated with the condensate separation tank of the adsorption system, and the second light hydrocarbon oil gas outlet is connected with the oil storage tank through the fourth power pump.
The third power pump set up between the heavy hydrocarbon oil gas export of absorption tower A and oil storage tank, still be provided with the first level gauge that is used for monitoring the heavy hydrocarbon absorbent liquid level of absorption tower A bottom simultaneously between third power pump and absorption tower A.
The fourth power pump is arranged between a second light hydrocarbon oil gas outlet of the absorption tower B and the oil storage tank, and a second liquid level meter for monitoring the liquid level of the light hydrocarbon absorbent at the bottom of the absorption tower B is also arranged between the fourth power pump and the absorption tower B.
The bottom of the first adsorption tank and the bottom of the second adsorption tank of the adsorption system are provided with four-way reversing valves, the four-way reversing valves are communicated with the condensate separation tank and a second oil-gas inlet on the absorption tower B, the top of the first adsorption tank and the top of the second adsorption tank are provided with electromagnetic three-way valves, and the electromagnetic three-way valves are connected with a discharge pipe.
The condensate separating tank is arranged between a first light hydrocarbon oil gas outlet on the adsorption system and the absorption tower A and a light hydrocarbon oil gas circulating outlet on the absorption tower B, and the output end of the condensate separating tank is connected with a four-way reversing valve of the adsorption system.
The vacuum pump is arranged between the adsorption system and a second oil gas inlet on the absorption tower B, and is a dry double-screw vacuum pump which is communicated with a four-way reversing valve of the adsorption system.
The recovery process of the combined oil gas recovery device comprises the following steps:
a. heavy diesel oil and light diesel oil extracted by an oil refinery are respectively stored in an oil depot I and an oil depot II as heavy hydrocarbon oil gas absorbents and light hydrocarbon oil gas absorbents, the heavy diesel oil is conveyed from the oil depot I to a first absorption system by a first absorbent inlet of an absorption tower A by a first power pump, heavy hydrocarbon macromolecular oil gas in combined oil gas is absorbed by the heavy hydrocarbon macromolecular absorbents in the first absorption system, and the heavy hydrocarbon oil gas absorbents are monitored by a first liquid level meter to be saturated and then conveyed back to an oil storage tank by a third power pump;
b. the light hydrocarbon micromolecule oil gas which is not absorbed after passing through the first absorption system enters a condensate separation tank through a first light hydrocarbon oil gas outlet of the absorption tower A, oil liquid drops in the oil gas are separated out by the condensate separation tank and stored at the bottom of the condensate separation tank, the oil gas enters a first adsorption tank of the adsorption system through a four-way reversing valve for absorption and separation, and the first adsorption tank is switched to a second adsorption tank for continuous adsorption work after the adsorption of the first adsorption tank reaches saturation, so that the alternate work of the two adsorption tanks is realized, and the continuous and stable operation of the adsorption system is ensured;
c. the light hydrocarbon micromolecule oil gas which is adsorbed and desorbed by the adsorption system is introduced into the second absorption system from a second oil gas inlet through a vacuum pump, the light hydrocarbon micromolecule oil gas is absorbed and recovered by using a light hydrocarbon oil gas absorbent in the absorption tower B, and the light hydrocarbon oil gas absorbent is conveyed back into the oil storage tank through a fourth power pump after being monitored by the second liquid level meter to be absorbed and saturated;
d. adsorption system and second absorption system form circulation circuit, light hydrocarbon micromolecule oil gas that is not absorbed by light hydrocarbon oil gas absorbent in the second absorption system returns through the light hydrocarbon oil gas circulation export at absorption tower B top and enters into the condensate separation tank, through the cross-valve switching-over valve reentrant adsorption system, carry out the reabsorption separation under adsorption system's effect, discharge the tail gas up to standard of extremely low concentration through the electromagnetism three-way valve, finally make light hydrocarbon micromolecule oil gas by abundant absorption.
The invention has the beneficial effects that:
(1) the combined oil gas recovery device provided by the invention utilizes the two absorption systems and the absorption system consisting of the two absorption tanks to separate heavy hydrocarbon macromolecule oil gas in the combined oil gas, so that the absorption system is ensured to have good absorption effect on light hydrocarbon micromolecule oil gas, and the light hydrocarbon micromolecule oil gas is further thoroughly separated by adopting the second absorption system, thereby improving the separation and recovery effect.
(2) And the adsorption system and the second absorption system form circulating work, and light hydrocarbon small molecule oil gas is absorbed by circulating adsorption, so that the recovery efficiency of the light hydrocarbon small molecule oil gas is improved.
(3) Oil drops are removed by the condensate separating tank before the light hydrocarbon micromolecule oil gas enters the second adsorption system, so that the adsorption system is prevented from being damaged by liquid drops in the oil gas, and the service life of the adsorption system is effectively prolonged.
(4) Two adsorption tanks of the adsorption system use a four-way reversing valve and an electromagnetic three-way valve to realize the switching of the adsorption and desorption functions of the two adsorption tanks, so that the adsorption system can continuously operate and has high working efficiency.
(5) Heavy diesel oil and light diesel oil extracted from an oil refinery are directly used as a heavy hydrocarbon oil gas absorbent and a light hydrocarbon oil gas absorbent respectively, oil refinery resources are fully utilized, separation and recovery of combined oil gas are realized, and the method is economical and environment-friendly.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
the labels in the figure are: 1. oil depot I, 2, heavy hydrocarbon oil gas absorbent input end, 3, oil depot II, 4, light hydrocarbon oil gas absorbent input end, 5, a first power pump, 6, a second power pump, 7, an absorption tower A, 8, a third power pump, 9, a first liquid level meter, 10, an absorption tower B, 11, a fourth power pump, 12, a second liquid level meter, 13, an oil storage tank, 14, an oil refinery, 15, a first adsorption tank, 16, a second adsorption tank, 17, a condensate separation tank, 18, a four-way reversing valve, 19, an electromagnetic three-way valve, 20, a vacuum pump, 21, a first oil gas inlet, 22, a first absorbent inlet, 23, a heavy hydrocarbon oil gas outlet, 24, a first light hydrocarbon oil gas outlet, 25, a second oil gas inlet, 26, a second absorbent inlet, 27, a light hydrocarbon oil gas circulation outlet, 28, a second light hydrocarbon oil gas outlet, 29, a discharge pipe.
Detailed Description
The following detailed description of the embodiments of the present invention will be described in conjunction with the accompanying drawings, which are included for purposes of illustration only and are not to be construed as limiting the invention, and in which certain features are omitted, enlarged or reduced in size, not to represent the size of the actual product, for the purpose of better describing the following embodiments; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
As shown in fig. 1, a combined oil gas recovery device and a recovery process, the combined oil gas recovery device is arranged beside an oil refinery 14, and the combined oil gas recovery device comprises an absorbent input system, a first absorption system, a second absorption system, an absorption system and an oil storage tank 13; the absorbent input system comprises a heavy hydrocarbon oil gas absorbent input end 2, a light hydrocarbon oil gas absorbent input end 4, an oil depot I1, an oil depot II 3, a first power pump 5 and a second power pump 6; the heavy hydrocarbon oil gas absorbent input end 2 is arranged on an oil depot I1, the oil depot I1 is used for storing heavy diesel oil, an oil gas inlet of the oil depot I1 is connected with an oil refinery 14, a first power pump 5 is arranged between the oil depot I1 and an absorption tower A7 of a first absorption system, one end of the first power pump 5 is connected with the heavy hydrocarbon oil gas absorbent input end 2, and the other end of the first power pump is connected with an absorption tower A7 and is used for conveying the heavy diesel oil from the oil depot I1 to the first absorption system; the input end 4 of the light hydrocarbon oil gas absorbent is arranged on the oil depot II 3, the oil depot II 3 is used for storing light diesel oil, and an oil gas inlet of the oil depot II 3 is connected with an oil refinery 14; the second power pump 6 is arranged between the oil depot II 3 and an absorption tower B10 of the second absorption system, one end of the second power pump 6 is connected with the light hydrocarbon oil gas absorbent input end 4, and the other end of the second power pump is connected with an absorption tower B10 and is used for conveying light diesel oil from the oil depot II 3 to the second absorption system; the oil depot I1 and the oil depot II 3 are respectively connected with an oil refinery 14, and heavy diesel oil and light diesel oil respectively serve as a heavy hydrocarbon oil gas absorbent and a light hydrocarbon oil gas absorbent to enter a first absorption system and a second absorption system, so that the heavy diesel oil and the light diesel oil resources of the oil refinery 14 are fully utilized, and the combined oil-gas separation and recovery are realized.
The first absorption system comprises an absorption tower A7, a third power pump 8 and a first liquid level meter 9; the absorption tower A7 is provided with a first oil gas inlet 21, a first absorbent inlet 22, a heavy hydrocarbon oil gas outlet 23 and a first light hydrocarbon oil gas outlet 24; the first absorbent inlet 22 is positioned above the absorption tower A7, the first light hydrocarbon oil gas outlet 24 is arranged at the top end of the absorption tower A7 and is positioned above the first absorbent inlet 22, and the heavy hydrocarbon oil gas outlet 23 is arranged below the absorption tower A7; a first oil gas inlet 21 is connected with an external oil gas pipeline, a first absorbent inlet 22 is connected with the output end of the first power pump 5, a heavy hydrocarbon oil gas outlet 23 is connected with the oil storage tank 13 through a third power pump 8, and a first light hydrocarbon oil gas outlet 24 is connected with a condensate separation tank 17 of the adsorption system; and the third power pump 8 is used for sending the saturated heavy hydrocarbon oil gas absorbent in the absorption tower A7 back to the oil storage tank 13, a first liquid level meter 9 for monitoring the liquid level height of the heavy hydrocarbon absorbent in the absorption tower A7 is arranged between the third power pump 8 and the absorption tower A7, and the first liquid level meter 9 is electrically connected with the third power pump 8.
The second absorption system comprises an absorption tower B10, a fourth power pump 11 and a second liquid level meter 12; the absorption tower B10 is provided with a second oil gas inlet 25, a second absorbent inlet 26, a light hydrocarbon oil gas circulation outlet 27 and a second light hydrocarbon oil gas outlet 28; the second absorbent inlet 26 is positioned above the absorption tower B10, and the light hydrocarbon oil gas circulation outlet 27 is arranged at the top end of the absorption tower B10 and is positioned above the second absorbent inlet 26, so that the design structure is scientific and reasonable, the light hydrocarbon small molecule oil gas can be fully absorbed and recovered, and the absorption efficiency is improved; second oil gas entry 25 communicates with each other with adsorption system, and second absorbent entry 26 is connected with the output of second power pump 6, and light hydrocarbon oil gas circulation export 27 communicates with each other with adsorption system's condensate separation tank 17, and second light hydrocarbon gas export 28 is connected with oil storage tank 13 through fourth power pump 11, fourth power pump 11 be arranged in sending the saturated light hydrocarbon oil gas absorbent in absorption tower B10 back to oil storage tank 13, be provided with between fourth power pump 11 and the absorption tower B10 and be used for monitoring the second level gauge 12 of the light hydrocarbon absorbent liquid level of absorption tower B10 bottom, second level gauge 12 is connected with fourth power pump 11 electricity.
The adsorption system comprises a first adsorption tank 15, a second adsorption tank 16, a condensate separation tank 17, a four-way reversing valve 18, an electromagnetic three-way valve 19 and a vacuum pump 20; the bottoms of the first adsorption tank 15 and the second adsorption tank 16 are provided with a four-way reversing valve 18, the four-way reversing valve 18 is communicated with the condensate separation tank 17 and a second oil-gas inlet 25 on an absorption tower B10, the tops of the first adsorption tank 15 and the second adsorption tank 16 are provided with an electromagnetic three-way valve 19, and the electromagnetic three-way valve 19 is connected with a discharge pipe 29; the condensate separating tank 17 is arranged between the adsorption system and a first light hydrocarbon oil gas outlet 24 on the absorption tower A7 and a light hydrocarbon oil gas circulating outlet 27 on the absorption tower B10, and is used for separating oil droplets in light hydrocarbon micromolecule oil gas output from the first absorption system and the second absorption system; the vacuum pump 20 is arranged between the adsorption system and the second oil gas inlet 25 on the absorption tower B10 and is communicated with the four-way reversing valve 18 of the adsorption system, and the vacuum pump 20 is a dry double-screw vacuum pump and is used for desorbing the adsorbent in the adsorption system, so that the purity of the light hydrocarbon micromolecule oil gas is higher.
The oil storage tank 13 is communicated with the oil refinery 14, so that the heavy hydrocarbon macromolecular oil gas and the light hydrocarbon micromolecular oil gas in the oil storage tank 13 are finally separated and recovered, and are conveyed to the oil refinery 14 to be continuously refined and used, and the oil gas utilization rate is improved.
The recovery process of the combined oil and gas recovery device comprises the following steps:
a. heavy diesel oil and light diesel oil extracted from an oil refinery are respectively stored in an oil depot I1 and an oil depot II 3 as a heavy hydrocarbon oil gas absorbent and a light hydrocarbon oil gas absorbent, a first power pump 5 is started to convey the heavy diesel oil from the oil depot I1 to a first absorption system, namely, the heavy diesel oil enters the first absorption system from a first absorbent inlet 22 of an absorption tower A7, the heavy hydrocarbon oil gas absorbent firstly absorbs and separates heavy hydrocarbon macromolecular oil gas in combined oil gas, a third power pump 8 is started when the first liquid level meter monitors 9 that the heavy hydrocarbon absorbent at the bottom of the absorption tower A7 reaches a certain height, and the heavy hydrocarbon macromolecular oil gas is conveyed into an oil storage tank 13 through the third power pump 8;
b. the light hydrocarbon micromolecule oil gas which is not absorbed after passing through the first absorption system enters the condensate separation tank 17 through the first light hydrocarbon oil gas outlet 24 of the absorption tower A7, the absorption structure of the absorption system in the embodiment adopts a porous activated carbon structure, in order to prevent liquid drops in the oil gas from entering into gaps of the activated carbon and causing damage to the activated carbon structure, the condensate separation tank 17 is arranged between the first absorption system and the absorption system, the oil liquid drops in the oil gas are separated out by the condensate separation tank 17 and stored at the bottom of the tank, then the oil gas enters the first absorption tank 15 of the absorption system through the four-way reversing valve 18 for absorption and separation, when the activated carbon in the first absorption tank 15 is saturated and does not have absorption capacity, the adsorption operation is continued by switching to the second absorption tank 16 through the four-way reversing valve 18, and the first absorption tank 15 with saturated absorption enters a desorption regeneration state, the oil gas in the activated carbon is desorbed, so that the first adsorption tank 15 recovers the original adsorption capacity, when the second adsorption tank 16 is saturated again, the four-way reversing valve 18 is switched to the first adsorption tank 15 again to continue the adsorption work, the uninterrupted switching work of adsorption and desorption of the two adsorption tanks is realized, the continuous and stable operation of the adsorption system is ensured, and the work efficiency is improved;
c. the light hydrocarbon micromolecule oil gas adsorbed and desorbed by the adsorption system is introduced into the second absorption system through a second oil gas inlet 25 of the absorption tower B10 by the dry-type double-screw vacuum pump 20, the light hydrocarbon micromolecule oil gas is absorbed and recovered by using a light hydrocarbon oil gas absorbent in the absorption tower B10, when the second liquid level meter 12 monitors that the light hydrocarbon absorbent saturated in the bottom of the absorption tower B10 reaches a certain height, the fourth power pump 12 is started, and the light hydrocarbon micromolecule oil gas is conveyed into the oil storage tank 13 by the fourth power pump 12, so that the light hydrocarbon micromolecule oil gas and the heavy hydrocarbon macromolecule oil gas enter the oil storage tank 13 in batches for recovery, the continuous recovery is avoided, the working efficiency is reduced, and the cost is increased;
d. light hydrocarbon micromolecule oil gas which is not absorbed by the light hydrocarbon oil gas absorbent in the second absorption system returns to the condensate separation tank 17 through the light hydrocarbon oil gas circulation outlet 27 at the top of the absorption tower B10, the condensate separation tank 17 separates oil drops in the oil gas and stores the oil drops at the bottom of the tank, then the oil gas reenters the absorption system through the four-way reversing valve 18, the oil gas is absorbed and separated again under the action of the absorption system, the absorption system and the second absorption system form a circulation loop, finally, the light hydrocarbon micromolecule oil gas is fully absorbed and absorbed, and tail gas which reaches the emission standard and has extremely low concentration is discharged from the discharge pipe 29 through the electromagnetic three-way valve 19.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention claims should be included in the protection scope of the present invention claims.
Claims (4)
1. The utility model provides a combination vapor recovery system device, characterized by: the combined oil gas recovery device is arranged beside an oil refinery (14), and comprises an absorbent input system, a first absorption system, a second absorption system, an adsorption system and an oil storage tank (13); the absorption agent input system comprises a heavy hydrocarbon oil gas absorption agent input end (2), a light hydrocarbon oil gas absorption agent input end (4), an oil depot I (1), an oil depot II (3), a first power pump (5) and a second power pump (6), and the absorption agent input system is respectively connected with the first absorption system and the second absorption system through the first power pump (5) and the second power pump (6); the first absorption system comprises an absorption tower A (7), a third power pump (8) and a first liquid level meter (9), the second absorption system comprises an absorption tower B (10), a fourth power pump (11) and a second liquid level meter (12), and the first absorption system and the second absorption system are connected with an oil storage tank (13) through the third power pump (8) and the fourth power pump (11); the adsorption system comprises a first adsorption tank (15), a second adsorption tank (16), a condensate separation tank (17), a four-way reversing valve (18), an electromagnetic three-way valve (19) and a vacuum pump (20), and is communicated with the first absorption system and the second absorption system through the condensate separation tank (17) and the vacuum pump (20); the oil storage tank (13) is arranged between the oil depot I (1) and the oil depot II (3) and is respectively communicated with the oil depot I (1) and the oil depot II (3) and an oil refinery (14);
the third power pump (8) is arranged between a heavy hydrocarbon oil gas outlet (23) of the absorption tower A (7) and the oil storage tank (13), and a first liquid level meter (9) for monitoring the liquid level of a heavy hydrocarbon absorbent at the bottom of the absorption tower A (7) is also arranged between the third power pump (8) and the absorption tower A (7);
the fourth power pump (11) is arranged between a second light hydrocarbon gas outlet (28) of the absorption tower B (10) and the oil storage tank (13), and a second liquid level meter (12) for monitoring the liquid level of a light hydrocarbon absorbent at the bottom of the absorption tower B (10) is also arranged between the fourth power pump (11) and the absorption tower B (10);
the bottom parts of a first adsorption tank (15) and a second adsorption tank (16) of the adsorption system are provided with a four-way reversing valve (18), the four-way reversing valve (18) is communicated with a condensate separation tank (17) and a second oil-gas inlet (25) on an absorption tower B (10), the top parts of the first adsorption tank (15) and the second adsorption tank (16) are provided with an electromagnetic three-way valve (19), and the electromagnetic three-way valve (19) is connected with a discharge pipe (29);
the condensate separation tank (17) is arranged between the adsorption system and a first light hydrocarbon oil-gas outlet (24) on the absorption tower A (7) and a light hydrocarbon oil-gas circulation outlet (27) on the absorption tower B (10), and the output end of the condensate separation tank (17) is connected with a four-way reversing valve (18) of the adsorption system;
the vacuum pump (20) is arranged between the adsorption system and a second oil gas inlet (25) on the absorption tower B (10), and the vacuum pump (20) is a dry double-screw vacuum pump and is communicated with a four-way reversing valve (18) of the adsorption system;
the heavy hydrocarbon oil gas absorbent is characterized in that an input end (2) of the heavy hydrocarbon oil gas absorbent is arranged on an oil depot I (1), the oil gas inlet of the oil depot I (1) is connected with an oil refinery (14), a first power pump (5) is arranged between the oil depot I (1) and an absorption tower A (7) of a first absorption system, one end of the first power pump (5) is connected with the input end (2) of the heavy hydrocarbon oil gas absorbent, and the other end of the first power pump is connected with the absorption tower A (7); the input end (4) of the light hydrocarbon oil gas absorbent is arranged on the oil depot II (3), the oil depot II (3) is used for storing light diesel oil, and an oil gas inlet of the oil depot II (3) is connected with an oil refinery (14); and the second power pump (6) is arranged between the oil depot II (3) and the absorption tower B (10) of the second absorption system, one end of the second power pump (6) is connected with the light hydrocarbon oil gas absorbent input end (4), and the other end of the second power pump is connected with the absorption tower B (10).
2. The combination oil and gas recovery device of claim 1, wherein: a first oil gas inlet (21), a first absorbent inlet (22), a heavy hydrocarbon oil gas outlet (23) and a first light hydrocarbon oil gas outlet (24) are formed in the absorption tower A (7); the first absorbent inlet (22) is positioned above the absorption tower A (7), the first light hydrocarbon oil gas outlet (24) is arranged at the top end of the absorption tower A (7) and is positioned above the first absorbent inlet (22), and the heavy hydrocarbon oil gas outlet (23) is arranged below the absorption tower A (7); first oil gas entry (21) are connected with outside oil gas pipeline, and first absorbent entry (22) are connected with the output of first power pump (5), and heavy hydrocarbon oil gas export (23) are connected with oil storage tank (13) through third power pump (8), and first light hydrocarbon oil gas export (24) are connected with adsorption system's lime set separating tank (17).
3. The combination oil and gas recovery device of claim 1, wherein: the absorption tower B (10) is provided with a second oil gas inlet (25), a second absorbent inlet (26), a light hydrocarbon oil gas circulation outlet (27) and a second light hydrocarbon oil gas outlet (28); the second absorbent inlet (26) is positioned above the absorption tower B (10), and the light hydrocarbon oil-gas circulation outlet (27) is arranged at the top end of the absorption tower B (10) and positioned above the second absorbent inlet (26); the second oil gas inlet (25) is communicated with the adsorption system, the second absorbent inlet (26) is connected with the output end of the second power pump (6), the light hydrocarbon oil gas circulation outlet (27) is communicated with the condensate separation tank (17) of the adsorption system, and the second light hydrocarbon oil gas outlet (28) is connected with the oil storage tank (13) through the fourth power pump (11).
4. A recovery process of a combined oil and gas recovery device according to any one of claims 1 to 3, characterized by: the recovery process of the combined oil gas recovery device comprises the steps of utilizing heavy diesel oil and light diesel oil as a two-stage absorption system of a heavy hydrocarbon oil gas absorbent and a light hydrocarbon oil gas absorbent and an absorption system consisting of two absorption tanks, separating and recovering heavy hydrocarbon macromolecular oil gas and light hydrocarbon micromolecular oil gas in the combined oil gas, and circularly absorbing and absorbing the light hydrocarbon micromolecular oil gas through a circulating loop formed by the absorption system and a second absorption system, so that the recovery efficiency of the light hydrocarbon micromolecular oil gas is improved; the method specifically comprises the following steps:
a. heavy diesel oil and light diesel oil extracted from an oil refinery are respectively stored in an oil depot I (1) and an oil depot II (3) as a heavy hydrocarbon oil-gas absorbent and a light hydrocarbon oil-gas absorbent, the heavy diesel oil is conveyed to a first absorption system from the oil depot I (1) through a first absorbent inlet (22) of an absorption tower A (7) by a first power pump (5), heavy hydrocarbon macromolecular oil gas in combined oil gas is absorbed by the heavy hydrocarbon macromolecular absorbent in the first absorption system, and the heavy hydrocarbon oil-gas absorbent is monitored by a first liquid level meter (9) to be conveyed back to an oil storage tank (13) through a third power pump (8) after being saturated;
b. light hydrocarbon micromolecule oil gas which is not absorbed after passing through the first absorption system enters a condensate separation tank (17) through a first light hydrocarbon oil gas outlet (24) of an absorption tower A (7), oil drops in the oil gas are separated by the condensate separation tank (17) and stored at the bottom of the tank, the oil gas enters a first adsorption tank (15) of the adsorption system through a four-way reversing valve (18) for absorption and separation, when the first adsorption tank (15) is adsorbed to be saturated, the adsorption system is switched to a second adsorption tank (16) for continuous adsorption work, the alternate work of the two adsorption tanks is realized, and the continuous and stable operation of the adsorption system is ensured;
c. the light hydrocarbon micromolecule oil gas desorbed after being adsorbed by the adsorption system is introduced into a second absorption system through a second oil gas inlet (25) by a vacuum pump (20), the light hydrocarbon micromolecule oil gas is absorbed and recovered by using a light hydrocarbon oil gas absorbent in the absorption tower B (10), and the light hydrocarbon oil gas absorbent is conveyed back into the oil storage tank (13) through a fourth power pump (11) after being monitored by a second liquid level meter (12) to be absorbed and saturated;
d. adsorption system and second absorption system form circulation circuit, light hydrocarbon micromolecule oil gas that is not absorbed by light hydrocarbon oil gas absorbent in the second absorption system, light hydrocarbon oil gas circulation export (27) through absorption tower B (10) top returns and enters into in condensate separation tank (17), enter into adsorption system again through four-way reversing valve (18), absorb the separation once more under adsorption system's effect, discharge up to standard tail gas of extremely low concentration through electromagnetic three-way valve (19), finally make light hydrocarbon micromolecule oil gas fully adsorb the absorption.
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| CN101015760A (en) * | 2006-12-29 | 2007-08-15 | 江苏工业学院 | Oil-gas recovery method and device using absorption and adsorbing integration technology |
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