CN111188992B - Recovery method for vent natural gas of gas gathering station - Google Patents
Recovery method for vent natural gas of gas gathering station Download PDFInfo
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- CN111188992B CN111188992B CN201811350045.6A CN201811350045A CN111188992B CN 111188992 B CN111188992 B CN 111188992B CN 201811350045 A CN201811350045 A CN 201811350045A CN 111188992 B CN111188992 B CN 111188992B
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 144
- 238000011084 recovery Methods 0.000 title claims abstract description 72
- 239000003345 natural gas Substances 0.000 title claims abstract description 71
- 239000007789 gas Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000003860 storage Methods 0.000 claims abstract description 129
- 238000001179 sorption measurement Methods 0.000 claims abstract description 44
- 238000005380 natural gas recovery Methods 0.000 claims abstract description 19
- 238000012545 processing Methods 0.000 claims description 13
- 239000007787 solid Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 9
- 230000009471 action Effects 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 239000008239 natural water Substances 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 239000003463 adsorbent Substances 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 238000004064 recycling Methods 0.000 abstract 2
- 230000008569 process Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000013022 venting Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
- F17C5/02—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases
- F17C5/04—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases requiring the use of refrigeration, e.g. filling with helium or hydrogen
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
- F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/04—Arrangement or mounting of valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2265/00—Effects achieved by gas storage or gas handling
- F17C2265/03—Treating the boil-off
- F17C2265/032—Treating the boil-off by recovery
- F17C2265/033—Treating the boil-off by recovery with cooling
- F17C2265/035—Treating the boil-off by recovery with cooling with subcooling the liquid phase
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a recovery method for vent natural gas of a gas gathering station, which relates to the technical field of natural gas recovery.A recovery system comprises three stages of natural gas recovery devices, wherein natural gas pipelines are sequentially connected, the primary recovery device, the secondary recovery device and the tertiary recovery device are respectively connected with a data control and acquisition system, and the primary recovery device comprises a first hydrate storage tank, a first temperature sensor and a first pressure sensor; the secondary recovery device comprises a second hydrate storage tank, a second temperature sensor and a second pressure sensor; the third-stage recovery device comprises an adsorption tank and a third temperature sensor; the top of the adsorption tank is connected with a ground torch. The gas collecting station has the advantages that the discharged natural gas of the gas collecting station is recycled and treated by the three-stage natural gas recycling, the discharged natural gas can be efficiently recycled, and the gas collecting station has the advantages of being simple in operation, high in automation degree and high in natural gas recycling efficiency.
Description
Technical Field
The invention relates to the technical field of natural gas recovery, in particular to a recovery method for vent natural gas of a gas gathering station.
Background
Currently, there is a lot of natural gas that is vented during the development and production of oil and gas fields. The emptying of natural gas mainly comes from three aspects: (1) in the development process of a gas field, natural gas emptying cannot be avoided in order to ensure safe production; (2) some oil fields are low in associated gas content, are located in remote areas and are invariable in traffic, and in addition, domestic oil and gas fields are always under rolling development, lack facilities for recovering trial production natural gas and can only be emptied for a long time; (3) and emptying the gas collecting station. The third phenomenon is the venting of natural gas (in the gas station). The existing high-pressure gas gathering station is a gas production process for carrying out centralized heating and separation treatment on natural gas of a plurality of gas wells, and has the advantages of centralized management, convenience for gas quantity regulation and automatic control, reduction of managers, management cost saving, multiple purposes of one machine and gas production cost saving.
The recovery and utilization of the vent natural gas are various, but the traditional process (in-site utilization, heavy hydrocarbon separation, collection and export and the like) has obvious defects in the recovery and utilization of the vent natural gas which is attempted to solve the problem of small gas amount and depends on poor conditions, both from the viewpoint of investment economy and site operability. The onsite utilization mode takes a well site generator as an example, although the technology is mature and has more applications, the problem that the sleeve gas resource and value cannot be fully or completely utilized exists, and the popularization and the applicability are greatly limited; the related process types of heavy hydrocarbon separation modes are various, such as a condensation method, a membrane method and the like, but mainly aim at recovering heavy hydrocarbon with higher economic value, but lack the recovery and utilization of main component methane, and simultaneously have the defects of overlarge equipment investment, complex process, overlong device investment recovery period, high field operation management requirement and the like; in the mode of collection and export, the economy of preparing the compressed natural gas product is poor; and the direct conversion of the vented natural gas into the forms of CNG and LNG has the disadvantages of harsh conditions, high investment cost and the like.
Therefore, the development of an economical and efficient recovery device and method for the evacuated natural gas in the gas gathering station is significant for effectively utilizing the natural gas. Chinese patent CN205208144U relates to a gas collecting station vent natural gas recovery system, which comprises a gas collecting main path for collecting wellhead vent gas, wherein a vent branch for venting gas to atmosphere is connected to the gas outlet of the gas collecting main path, a recovery branch for recovering vent gas is also connected to the gas outlet of the gas collecting main path, and the recovery branch is connected in parallel with the vent branch.
Disclosure of Invention
In order to solve the technical problem, the invention discloses a recovery method for vent natural gas of a gas gathering station.
In order to achieve the purpose, the invention adopts the following technical scheme:
a recovery method for the natural gas discharged from a gas gathering station comprises the steps that a recovery system comprises three stages of natural gas recovery devices which are sequentially connected through natural gas pipelines, a primary recovery device, a secondary recovery device and a tertiary recovery device are respectively connected with a data control and acquisition system, and a first stop valve, a three-way valve and a fifth stop valve are sequentially arranged on a natural gas transportation pipeline; the primary recovery device comprises a first hydrate storage tank, a first temperature sensor and a first pressure sensor; the secondary recovery device comprises a second hydrate storage tank, a second temperature sensor and a second pressure sensor; the third-stage recovery device comprises an adsorption tank and a third temperature sensor;
the method sequentially comprises the following steps:
(1) closing the first stop valve and the fifth stop valve, filling medium water and a hydrate accelerant into the first hydrate storage tank and the second hydrate storage tank in advance, filling an adsorbing material into the adsorption tanks, respectively setting the temperatures of the first hydrate storage tank and the second hydrate storage tank and the opening pressures of the first safety valve and the second safety valve, and keeping the temperatures of the first hydrate storage tank and the second hydrate storage tank for more than 2 hours when the temperatures of the first hydrate storage tank and the second hydrate storage tank reach the set temperatures;
(2) sequentially opening a three-way valve, a second stop valve, a third stop valve, a fourth stop valve, a first electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve;
opening a first stop valve, enabling the emptied natural gas to enter a first hydrate storage tank through a natural gas pipeline for primary recovery processing, enabling the natural gas and water to quickly form a solid hydrate under the action of a hydrate accelerant, recovering and storing the natural gas in the form of the solid hydrate, enabling a first temperature sensor and a first pressure sensor which are installed on the first hydrate storage tank to monitor the temperature and pressure change conditions in the first hydrate storage tank in real time, and enabling a first safety valve to be automatically opened when the pressure in the first hydrate storage tank is higher than a set pressure to perform pressure relief processing on the first hydrate storage tank; then, natural gas enters a second hydrate storage tank through a pipeline for secondary recovery treatment, the natural gas and water quickly form solid hydrate under the action of a hydrate accelerant, the natural gas is recovered and stored in the form of the solid hydrate, a second temperature sensor and a second pressure sensor which are arranged in the second hydrate storage tank can monitor the temperature and pressure change conditions in the second hydrate storage tank in real time, and when the pressure in the second hydrate storage tank is higher than the set pressure, a second safety valve can be automatically opened to perform pressure relief treatment on the second hydrate storage tank;
(3) after the natural gas of unloading is through two-stage recovery processing, the rethread adsorption tanks begins to carry out the tertiary recovery processing that adsorbs, through the high-efficient absorption of adsorption material in the adsorption tanks, and tail gas directly gets into ground torch, discharges into the atmosphere after the burning.
Furthermore, a first temperature control coil and a first heat preservation layer are sequentially arranged outside a first hydrate storage tank in the primary recovery device from inside to outside, the bottom of the first hydrate storage tank is connected with a three-way valve on a natural gas pipeline through a pipeline, a first temperature sensor is arranged at the bottom of the first hydrate storage tank, and a first pressure sensor is arranged at the top of the first hydrate storage tank;
a second temperature control coil pipe and a second heat insulation layer are sequentially arranged outside a second hydrate storage tank in the secondary recovery device from inside to outside, the bottom of the second hydrate storage tank is connected with the top of the first hydrate storage tank through a pipeline, a second temperature sensor is arranged at the bottom of the second hydrate storage tank, a second pressure sensor is arranged at the top of the second hydrate storage tank, and a first electromagnetic valve and a second stop valve are further arranged on the pipeline connecting the first hydrate storage tank and the second hydrate storage tank;
a third temperature sensor in the three-stage recovery device is arranged in the middle of the adsorption tank, the top of the second hydrate storage tank is connected with the bottom of the adsorption tank through a pipeline, and a second electromagnetic valve and a third stop valve are further arranged on the pipeline connecting the second hydrate storage tank and the adsorption tank;
the top of the adsorption tank is connected with a ground torch, and a third electromagnetic valve and a fourth stop valve are further arranged on a connecting pipeline of the adsorption tank and the ground torch.
Further, the tops of the first hydrate storage tank and the second hydrate storage tank are respectively provided with a first safety valve and a second safety valve.
Further, the first temperature sensor and the first pressure sensor are respectively connected with a data control and acquisition system.
Further, the second temperature sensor, the second pressure sensor and the first electromagnetic valve are respectively connected with a data control and acquisition system.
Further, the third temperature sensor and the second electromagnetic valve are respectively connected with a data control and acquisition system.
Further, the third electromagnetic valve is connected with a data control and acquisition system.
Further, the natural gas pipeline is also connected with the ground flare.
Furthermore, the adsorption material filled in the adsorption tank is activated carbon.
Compared with the prior art, the natural gas recovery method has the advantages that the natural gas discharged from the gas collecting station is recovered by adopting a natural gas recovery method combining a hydrate method and an adsorption material adsorption method, the efficient recovery of the discharged natural gas can be realized, and the natural gas recovery method has the advantages of simplicity in operation, high automation degree, high natural gas recovery efficiency and the like; the problems of complex process and low natural gas recovery rate of the existing gas gathering station emptying natural gas recovery method are solved.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Wherein, 1, a first heat preservation layer; 2. a first temperature control coil; 3. a first hydrate storage tank; 4. a first temperature sensor; 5. a first pressure sensor; 6. a first safety valve; 7. a first solenoid valve; 8. a second temperature sensor; 9. a second pressure sensor; 10. a second relief valve; 11. a second hydrate storage tank; 12. a second solenoid valve; 13. a second insulating layer; 14. a second temperature control coil; 15. a third temperature sensor; 16. an adsorption tank; 17. a third electromagnetic valve; 18. a ground torch; 19. a first shut-off valve; 20. a three-way valve; 21. a second stop valve; 22. a third stop valve; 23. a fourth stop valve; 24. a fifth stop valve; 25. a data control and acquisition system.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in the figure, the recovery method for the vent natural gas of the gas gathering station comprises three stages of natural gas recovery devices which are sequentially connected through natural gas pipelines, wherein a first stage recovery device, a second stage recovery device and a third stage recovery device are respectively connected with a data control and acquisition system 25, and a first stop valve 19, a three-way valve 20 and a fifth stop valve 24 are sequentially arranged on a natural gas transportation pipeline;
the primary recovery device comprises a first hydrate storage tank 3, a first temperature sensor 4 and a first pressure sensor 5, a first temperature control coil 2 and a first heat preservation layer 1 are sequentially arranged on the outer portion of the first hydrate storage tank 3 from inside to outside, and the first temperature control coil 2 is used for controlling the temperature of the first hydrate storage tank 3, so that the temperature of the first hydrate storage tank 3 is always consistent with the temperature required by hydrate generation, and smooth generation and storage of hydrate are guaranteed; the first heat preservation layer 1 is used for carrying out heat preservation treatment on the first hydrate storage tank 3 to prevent the natural gas from generating severe temperature change in the recovery process; the bottom of the first hydrate storage tank 3 is connected with a three-way valve 20 on a natural gas pipeline through a pipeline, a first temperature sensor 4 is arranged at the bottom of the first hydrate storage tank 3, and a first pressure sensor 5 is arranged at the top of the first hydrate storage tank 3;
the secondary recovery device comprises a second hydrate storage tank 11, a second temperature sensor 8 and a second pressure sensor 9, a second temperature control coil 14 and a second heat insulation layer 13 are sequentially arranged outside the second hydrate storage tank 11 from inside to outside, and the second temperature control coil 14 is used for controlling the temperature of the second hydrate storage tank 11, so that the temperature of the second hydrate storage tank 11 always meets the temperature required by hydrate generation, and smooth generation and storage of hydrate are guaranteed; the bottom of the second hydrate storage tank 11 is connected with the top of the first hydrate storage tank 3 through a pipeline, and the second heat-insulating layer 13 is used for carrying out heat-insulating treatment on the second hydrate storage tank 11 so as to prevent the natural gas from generating severe temperature change in the recovery process; the second temperature sensor 8 is arranged at the bottom of the second hydrate storage tank 11, the second pressure sensor 9 is arranged at the top of the second hydrate storage tank 11, and a first electromagnetic valve 7 and a second stop valve 21 are further arranged on a pipeline connecting the first hydrate storage tank 3 and the second hydrate storage tank 11;
the three-stage recovery device comprises an adsorption tank 16 and a third temperature sensor 15, the third temperature sensor 15 is arranged in the middle of the adsorption tank 16 and is used for monitoring the temperature change condition of the adsorption tank 16 in the natural gas recovery process on line, the top of the second hydrate storage tank 11 is connected with the bottom of the adsorption tank 16 through a pipeline, and a second electromagnetic valve 12 and a third stop valve 22 are further arranged on the pipeline connecting the second hydrate storage tank 11 and the adsorption tank 16;
the top of the adsorption tank 16 is connected with a ground torch 18, and a third electromagnetic valve 17 and a fourth stop valve 23 are further arranged on a connecting pipeline of the adsorption tank 16 and the ground torch 18.
Particularly, the tops of the first hydrate storage tank 3 and the second hydrate storage tank 11 are further provided with a first safety valve 6 and a second safety valve 10 respectively, the first safety valve 6 and the second safety valve 10 are used for performing pressure protection on the first hydrate storage tank 3 and the second hydrate storage tank 11 respectively, and when the pressure in the first hydrate storage tank 3 and the pressure in the second hydrate storage tank 11 are higher than a set pressure, the first safety valve 6 and the second safety valve 10 are automatically opened to perform pressure relief processing.
Particularly, the first temperature sensor 4 and the first pressure sensor 5 are respectively connected with the data control and acquisition system 25, the first temperature sensor 4 is used for carrying out online temperature monitoring on the first hydrate storage tank 3, and the first pressure sensor 5 is used for carrying out online pressure monitoring on the first hydrate storage tank 3.
Particularly, the second temperature sensor 8, the second pressure sensor 9 and the first electromagnetic valve 7 are respectively connected with the data control and acquisition system 25, the second temperature sensor 8 is used for carrying out online temperature monitoring on the second hydrate storage tank 11, and the second pressure sensor 9 is used for carrying out online pressure monitoring on the second hydrate storage tank 11.
In particular, the third temperature sensor 15 and the second solenoid valve 12 are respectively connected to a data control and acquisition system 25.
In particular, the third solenoid valve 17 is connected to a data control and acquisition system 25.
Particularly, the natural gas pipeline is also connected with a ground torch 18, and the ground torch 18 is used for carrying out combustion treatment on the natural gas tail gas subjected to the three-stage recovery treatment so as to avoid causing environmental pollution.
In particular, the adsorbent filled in the adsorption tank 16 is activated carbon, and the third-stage natural gas recovery treatment is performed by the adsorption action of the adsorbent.
Medium pure water and hydrate generation accelerators required for generating hydrates are filled in the first hydrate storage tank 3 and the second hydrate storage tank 11, and the hydrate generation accelerators are mainly used for accelerating the hydrate generation rate and improving the natural gas recovery efficiency; the first hydrate storage tank 3, the second hydrate storage tank 11 and the adsorption tank 16 all adopt a structural mode that natural gas enters from the bottom and is discharged from the top, and the data control and acquisition system 25 is mainly used for carrying out data control and online acquisition on a first electromagnetic valve 7, a second electromagnetic valve 12, a third electromagnetic valve 17, a first temperature sensor 4, a second temperature sensor 8, a third temperature sensor 15, a first pressure sensor 5 and a second pressure sensor 9 involved in the device.
A recovery method for vent natural gas of a gas station sequentially comprises the following steps:
(1) closing the first stop valve 19 and the fifth stop valve 24, filling medium water and hydrate accelerant for generating hydrate into the first hydrate storage tank 3 and the second hydrate storage tank 11 in advance, filling an adsorbing material into the adsorption tank 16, respectively setting the temperatures of the first hydrate storage tank 3 and the second hydrate storage tank 11 and the opening pressures of the first safety valve 6 and the second safety valve 10, and keeping the temperatures of the first hydrate storage tank 3 and the second hydrate storage tank 11 for more than 2 hours when the temperatures of the first hydrate storage tank 3 and the second hydrate storage tank 11 reach the set temperatures;
(2) sequentially opening the three-way valve 20, the second stop valve 21, the third stop valve 22, the fourth stop valve 23, the first electromagnetic valve 7, the second electromagnetic valve 12 and the third electromagnetic valve 17;
opening a first stop valve 19, enabling the emptied natural gas to enter a first hydrate storage tank 3 through a natural gas pipeline for primary recovery processing, enabling the natural gas and water to quickly form a solid hydrate under the action of a hydrate accelerant, recovering and storing the natural gas in the form of the solid hydrate, enabling a first temperature sensor 4 and a first pressure sensor 5 installed on the first hydrate storage tank 3 to monitor the temperature and pressure change conditions in the first hydrate storage tank 3 in real time, and automatically opening a first safety valve 6 to perform pressure relief processing on the first hydrate storage tank 3 when the pressure in the first hydrate storage tank 3 is higher than a set pressure; then, natural gas enters a second hydrate storage tank 11 through a pipeline for secondary recovery treatment, the natural gas and water quickly form a solid hydrate under the action of a hydrate accelerant, the natural gas is recovered and stored in the form of the solid hydrate, a second temperature sensor 8 and a second pressure sensor 9 which are installed in the second hydrate storage tank 11 can monitor the temperature and pressure change conditions in the second hydrate storage tank 11 in real time, and when the pressure in the second hydrate storage tank 11 is higher than the set pressure, a second safety valve 10 can be automatically opened to perform pressure relief treatment on the second hydrate storage tank 11;
(3) after the natural gas of unloading through the two-stage recovery processing, rethread adsorption tank 16 begins to carry out the third level and adsorbs recovery processing, and through the high-efficient absorption of adsorption material in adsorption tank 16, tail gas directly gets into ground torch 18, discharges into the atmosphere after the burning.
The natural gas recovery method combining the hydrate method and the adsorption method of the adsorption material is adopted, the natural gas discharged from the gas collecting station is recovered by the three-stage natural gas recovery method, the high-efficiency recovery of the discharged natural gas can be realized, and the method has the advantages of simplicity in operation, high automation degree, high natural gas recovery efficiency and the like.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (7)
1. A recovery method for the natural gas discharged from a gas gathering station is characterized in that a recovery system comprises three stages of natural gas recovery devices which are sequentially connected through natural gas pipelines, a primary recovery device, a secondary recovery device and a tertiary recovery device are respectively connected with a data control and acquisition system, and a first stop valve, a three-way valve and a fifth stop valve are sequentially arranged on a natural gas transportation pipeline; the primary recovery device comprises a first hydrate storage tank, a first temperature sensor and a first pressure sensor; the secondary recovery device comprises a second hydrate storage tank, a second temperature sensor and a second pressure sensor; the third-stage recovery device comprises an adsorption tank and a third temperature sensor;
a first temperature control coil and a first heat preservation layer are sequentially arranged outside a first hydrate storage tank in the primary recovery device from inside to outside, the bottom of the first hydrate storage tank is connected with a three-way valve on a natural gas pipeline through a pipeline, a first temperature sensor is arranged at the bottom of the first hydrate storage tank, and a first pressure sensor is arranged at the top of the first hydrate storage tank;
a second temperature control coil pipe and a second heat insulation layer are sequentially arranged outside a second hydrate storage tank in the secondary recovery device from inside to outside, the bottom of the second hydrate storage tank is connected with the top of the first hydrate storage tank through a pipeline, a second temperature sensor is arranged at the bottom of the second hydrate storage tank, a second pressure sensor is arranged at the top of the second hydrate storage tank, and a first electromagnetic valve and a second stop valve are further arranged on the pipeline connecting the first hydrate storage tank and the second hydrate storage tank;
a third temperature sensor in the three-stage recovery device is arranged in the middle of the adsorption tank, the top of the second hydrate storage tank is connected with the bottom of the adsorption tank through a pipeline, and a second electromagnetic valve and a third stop valve are further arranged on the pipeline connecting the second hydrate storage tank and the adsorption tank;
the top of the adsorption tank is connected with a ground torch, and a third electromagnetic valve and a fourth stop valve are further arranged on a connecting pipeline of the adsorption tank and the ground torch; the natural gas pipeline is also connected with the ground flare;
the method sequentially comprises the following steps:
(1) closing the first stop valve and the fifth stop valve, filling medium water and a hydrate accelerant into the first hydrate storage tank and the second hydrate storage tank in advance, filling an adsorbing material into the adsorption tanks, respectively setting the temperatures of the first hydrate storage tank and the second hydrate storage tank and the opening pressures of the first safety valve and the second safety valve, and keeping the temperatures of the first hydrate storage tank and the second hydrate storage tank for more than 2 hours when the temperatures of the first hydrate storage tank and the second hydrate storage tank reach the set temperatures;
(2) sequentially opening a three-way valve, a second stop valve, a third stop valve, a fourth stop valve, a first electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve;
opening a first stop valve, enabling the emptied natural gas to enter a first hydrate storage tank through a natural gas pipeline for primary recovery processing, enabling the natural gas and water to quickly form a solid hydrate under the action of a hydrate accelerant, recovering and storing the natural gas in the form of the solid hydrate, enabling a first temperature sensor and a first pressure sensor which are installed on the first hydrate storage tank to monitor the temperature and pressure change conditions in the first hydrate storage tank in real time, and enabling a first safety valve to be automatically opened when the pressure in the first hydrate storage tank is higher than a set pressure to perform pressure relief processing on the first hydrate storage tank; then, natural gas enters a second hydrate storage tank through a pipeline for secondary recovery treatment, the natural gas and water quickly form solid hydrate under the action of a hydrate accelerant, the natural gas is recovered and stored in the form of the solid hydrate, a second temperature sensor and a second pressure sensor which are arranged in the second hydrate storage tank can monitor the temperature and pressure change conditions in the second hydrate storage tank in real time, and when the pressure in the second hydrate storage tank is higher than the set pressure, a second safety valve can be automatically opened to perform pressure relief treatment on the second hydrate storage tank;
(3) after the natural gas of unloading is through two-stage recovery processing, the rethread adsorption tanks begins to carry out the tertiary recovery processing that adsorbs, through the high-efficient absorption of adsorption material in the adsorption tanks, and tail gas directly gets into ground torch, discharges into the atmosphere after the burning.
2. The recovery method for the flare gas of a gathering station as set forth in claim 1, wherein the tops of the first hydrate storage tank and the second hydrate storage tank are further provided with a first safety valve and a second safety valve, respectively.
3. The recovery method for the flare gas of a gas station of claim 1, wherein the first temperature sensor and the first pressure sensor are each connected to a data control and acquisition system.
4. The recovery method for the flare gas of a gas station of claim 1, wherein the second temperature sensor, the second pressure sensor, and the first solenoid valve are each connected to a data control and acquisition system.
5. The recovery method for the flare gas of a gas station of claim 1, wherein the third temperature sensor and the second solenoid valve are separately connected to a data control and acquisition system.
6. The recovery method for the flare gas of a gas station of claim 1, wherein the third solenoid valve is connected to a data control and acquisition system.
7. The recovery method for station vent natural gas of claim 1, wherein the adsorbent material filled inside the adsorption tank is activated carbon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811350045.6A CN111188992B (en) | 2018-11-14 | 2018-11-14 | Recovery method for vent natural gas of gas gathering station |
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| CN201811350045.6A CN111188992B (en) | 2018-11-14 | 2018-11-14 | Recovery method for vent natural gas of gas gathering station |
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| CN111188992A CN111188992A (en) | 2020-05-22 |
| CN111188992B true CN111188992B (en) | 2022-03-15 |
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| US11717784B1 (en) | 2020-11-10 | 2023-08-08 | Solid State Separation Holdings, LLC | Natural gas adsorptive separation system and method |
| US11577191B1 (en) | 2021-09-09 | 2023-02-14 | ColdStream Energy IP, LLC | Portable pressure swing adsorption method and system for fuel gas conditioning |
| CN115125043A (en) * | 2022-06-23 | 2022-09-30 | 西南石油大学 | Vehicle-mounted natural gas hydrate recovery device and method |
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