CN115450603A - Well head high pressure natural gas automatic purification and step-down power generation system - Google Patents
Well head high pressure natural gas automatic purification and step-down power generation system Download PDFInfo
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- CN115450603A CN115450603A CN202211241271.7A CN202211241271A CN115450603A CN 115450603 A CN115450603 A CN 115450603A CN 202211241271 A CN202211241271 A CN 202211241271A CN 115450603 A CN115450603 A CN 115450603A
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 100
- 239000003345 natural gas Substances 0.000 title claims abstract description 51
- 238000010248 power generation Methods 0.000 title claims abstract description 21
- 238000000746 purification Methods 0.000 title claims abstract description 18
- 238000000926 separation method Methods 0.000 claims abstract description 113
- 239000007789 gas Substances 0.000 claims abstract description 106
- 238000011084 recovery Methods 0.000 claims abstract description 84
- 239000007788 liquid Substances 0.000 claims abstract description 59
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 58
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 58
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 58
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 230000008602 contraction Effects 0.000 claims description 14
- 238000002347 injection Methods 0.000 claims description 14
- 239000007924 injection Substances 0.000 claims description 14
- 238000009792 diffusion process Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000010992 reflux Methods 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 230000006837 decompression Effects 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 abstract description 6
- 230000005611 electricity Effects 0.000 abstract description 4
- 239000002343 natural gas well Substances 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 10
- 238000004064 recycling Methods 0.000 description 5
- 238000004134 energy conservation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000003245 working effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000009351 contact transmission Effects 0.000 description 1
- 230000020335 dealkylation Effects 0.000 description 1
- 238000006900 dealkylation reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
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- Mining & Mineral Resources (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
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- Geochemistry & Mineralogy (AREA)
- Fluid Mechanics (AREA)
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Abstract
The invention provides a wellhead high-pressure natural gas automatic purification and depressurization power generation system; this system adopts integral sled dress, including the natural gas well head gas production tree that connects gradually, vertical three-phase separator, recovery unit, steam turbine, generator, battery, recovery unit includes heavy hydrocarbon separation and gas recovery unit and the gas-liquid separation and the gas recovery unit who is connected with heavy hydrocarbon separation and gas recovery unit, is connected with the horizontal double-phase separator of the reseparation that is used for heavy hydrocarbon and natural gas on heavy hydrocarbon separation and gas recovery unit, is connected with the horizontal double-phase separator of the reseparation second that is used for free aqueous vapor and natural gas on gas-liquid separation and the gas recovery unit. The invention can generate power by pressure energy, recover huge pressure energy, and has the advantages of eliminating potential safety hazard of equipment, higher economy and the like; the application to the natural gas pipe network can not only solve the problem of electricity shortage of remote voltage regulating stations and voltage regulating boxes, but also replace or reduce municipal electricity consumption of office places.
Description
Technical Field
The invention relates to a wellhead high-pressure natural gas automatic purification and depressurization power generation system, and belongs to the technical field of deep well and ultra-deep well high-pressure natural gas exploitation.
Background
Along with the continuous development of oil gas trade, more and more unconventional gas fields are explored and developed, and deep well and ultra-deep well are more and more, and well head gas production pressure is higher than the pipe transmission pressure far away, consequently need carry out the depressurization to well head gas production and handle, and traditional depressurization mode not only will contain the pressure energy waste, still can threaten pipeline and equipment operation safety because of sharply cooling down.
Disclosure of Invention
In order to solve the technical problems, the invention provides a wellhead high-pressure natural gas automatic purification and depressurization power generation system which is of an integral skid-mounted structure, solves the problems of depressurization and pressure energy reutilization after the exploitation of high-pressure natural gas of deep wells and ultra-deep wells, realizes the reutilization of depressurization pressure energy, improves the energy reutilization efficiency, and has the advantages of high efficiency, energy conservation, economy and environmental protection.
The invention is realized by the following technical scheme.
The invention provides a wellhead high-pressure natural gas automatic purification and depressurization power generation system; the system adopts an integral skid-mounted device and comprises a natural gas wellhead gas production tree, a vertical three-phase separator, a recovery device, a steam turbine, a generator and a storage battery which are sequentially connected, wherein the recovery device comprises a heavy hydrocarbon separation and gas recovery device and a gas-liquid separation and gas recovery device connected with the heavy hydrocarbon separation and gas recovery device, and the heavy hydrocarbon separation and gas recovery device and the gas-liquid separation and gas recovery device have the same structure; the heavy hydrocarbon separation and gas recovery device is connected with a first horizontal two-phase separator for re-separation of heavy hydrocarbon and natural gas, and the gas-liquid separation and gas recovery device is connected with a second horizontal two-phase separator for re-separation of free water gas and natural gas.
Heavy hydrocarbon separation and gaseous recovery unit again includes the stationary flow section, and the one end intercommunication of stationary flow section has separation chamber and export diffusion section, and the other end intercommunication has to draw and penetrates backward flow chamber and be used for the gas to step down the contraction and expansion type nozzle with higher speed.
The contraction and expansion type nozzle is provided with an injection backflow port, and the separation cavity is provided with a separation port.
The inlet end of the contraction and expansion type nozzle is connected with an inlet cavity, and a swirler for swirling natural gas is arranged in the inlet cavity.
The outlet diffusion section of the heavy hydrocarbon separation and gas recovery device is connected with the inlet chamber of the gas-liquid separation and gas recovery device, the inlet chamber of the heavy hydrocarbon separation and gas recovery device is connected with the vertical three-phase separator, and the outlet diffusion section of the gas-liquid separation and gas recovery device is connected with the steam turbine; the separation port and the injection backflow port of the heavy hydrocarbon separation and gas recycling device are connected with the first horizontal two-phase separator through flanges, and the separation port and the injection backflow port of the gas-liquid separation and gas recycling device are connected with the second horizontal two-phase separator through flanges.
A manual control valve for regulating and protecting bottom hole pressure is arranged between the natural gas wellhead gas production tree and the vertical three-phase separator for primary gas-solid-liquid separation; and a material level meter for detecting the amount of solid liquid and feeding back related signals is arranged on one side of the vertical three-phase separator, and a first electric valve for cleaning and separating solid and liquid is arranged at a bottom flow port of the vertical three-phase separator.
A second electric valve, a first gas mass flowmeter and a first pressure transmitter are sequentially arranged on a pipeline connected with the vertical three-phase separator and the heavy hydrocarbon separation and gas recovery device; a second pressure transmitter, a fourth electric valve and a third pressure transmitter are sequentially arranged on a pipeline connecting the heavy hydrocarbon separation and gas recovery device with the gas-liquid separation and gas recovery device; and a fourth pressure transmitter and a sixth electric valve are sequentially arranged on a pipeline connecting the gas-liquid separation and gas recycling device with the steam turbine.
A first liquid level meter is arranged on one side of the first horizontal two-phase separator, and a third electric valve is arranged at the underflow opening of the first horizontal two-phase separator; and a second liquid level meter is arranged on one side of the second horizontal two-phase separator, and a fifth electric valve is arranged at the underflow port of the second horizontal two-phase separator.
And a seventh electric valve and a second gas mass flow meter are sequentially arranged on a gas outlet pipeline of the steam turbine, and a pipeline interface connected with an external pipeline is reserved on the second gas mass flow meter.
And a rotating shaft of the steam turbine is connected with the generator through a magnetic coupling.
The invention has the beneficial effects that: the pressure energy power generation can be carried out, huge pressure energy is recovered, and the device has the advantages of eliminating potential safety hazards of equipment, being high in economy and the like; the application of the natural gas pipeline can solve the problem of electricity shortage of remote voltage regulating stations and voltage regulating boxes, replace or reduce municipal power consumption in office places, open up a new energy path for energy conservation and consumption reduction of enterprises, and contribute to energy conservation, emission reduction and environmental protection.
Drawings
FIG. 1 is a schematic connection diagram of the present invention;
FIG. 2 is a schematic diagram of the heavy hydrocarbon separation and gas recovery unit of FIG. 1;
in the figure: 1-natural gas wellhead gas production tree, 2-manual control valve, 3-first electric valve, 4-vertical three-phase separator, 5-level meter, 6-second electric valve, 7-first gas mass flowmeter, 8-first pressure transmitter, 9-heavy hydrocarbon separation and gas recovery device, 901-inlet chamber, 902-cyclone, 903-contraction and expansion type nozzle, 904-injection reflux chamber, 905-steady flow section, 906-separation chamber, 907-outlet pressure expansion section, 908-separation port, 909-injection reflux port, 10-first liquid level meter, 11-first horizontal two-phase separator, 12-third electric valve, 13-second pressure transmitter, 14-fourth electric valve, 15-third pressure transmitter, 16-gas-liquid separation and gas recovery device, 17-second liquid level meter, 18-second horizontal two-phase separator, 19-fifth electric valve, 20-fourth pressure transmitter, 21-sixth electric valve, 22-manual control valve, 23-second gas mass flowmeter, 24-seventh electric valve, 25-magnetic power generator, storage battery mass flowmeter, 26-25-magnetic power generator, and storage battery.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
Example 1
As shown in fig. 1, a wellhead high-pressure natural gas automatic purification and depressurization power generation system; the system adopts an integral skid-mounted structure and comprises a natural gas wellhead gas production tree 1, a vertical three-phase separator 4, a recovery device, a steam turbine 22, a generator 26 and a storage battery 27 which are sequentially connected, wherein the recovery device comprises a heavy hydrocarbon separation and gas recovery device 9 and a gas-liquid separation and gas recovery device 16 connected with the heavy hydrocarbon separation and gas recovery device 9, and the heavy hydrocarbon separation and gas recovery device 9 and the gas-liquid separation and gas recovery device 16 have the same structure; the heavy hydrocarbon separation and gas recovery device 9 is connected with a first horizontal two-phase separator 11 for re-separation of heavy hydrocarbon and natural gas, and the gas-liquid separation and gas recovery device 16 is connected with a second horizontal two-phase separator 18 for re-separation of free water gas and natural gas.
As shown in fig. 2, the heavy hydrocarbon separation and gas recovery device 9 includes a steady flow section 905, one end of the steady flow section 905 is communicated with a separation cavity 906 and an outlet diffusion section 907, and the other end is communicated with an injection reflux cavity 904 and a contraction and expansion type nozzle 903 for reducing pressure and accelerating gas.
An injection backflow port 909 is arranged on the contraction and expansion type nozzle 903, and a separation port 908 is arranged on the separation cavity 906.
An inlet chamber 901 is connected to an inlet end of the convergent-divergent nozzle 903, and a cyclone 902 for swirling natural gas is arranged in the inlet chamber 901.
The outlet diffusion section 907 of the heavy hydrocarbon separation and gas recovery device 9 is connected with the inlet chamber 901 of the gas-liquid separation and gas recovery device 16, the inlet chamber 901 of the heavy hydrocarbon separation and gas recovery device 9 is connected with the vertical three-phase separator 4, and the outlet diffusion section 907 of the gas-liquid separation and gas recovery device 16 is connected with the steam turbine 22; the separation port 908 and the injection reflux port 909 of the heavy hydrocarbon separation and gas recovery device 9 are connected with the first horizontal two-phase separator 11 through flanges, and the separation port 908 and the injection reflux port 909 of the gas-liquid separation and gas recovery device 16 are connected with the second horizontal two-phase separator 18 through flanges.
A manual control valve 2 for regulating and protecting bottom hole pressure is arranged between the natural gas wellhead gas production tree 1 and a vertical three-phase separator 4 for primary gas-solid-liquid separation; one side of the vertical three-phase separator 4 is provided with a material level meter 5 for detecting the amount of solid liquid and feeding back related signals, and a bottom flow port of the vertical three-phase separator 4 is provided with a first electric valve 3 for cleaning and separating solid and liquid.
A second electric valve 6, a first gas mass flowmeter 7 and a first pressure transmitter 8 are sequentially arranged on a pipeline connected with the vertical three-phase separator 4 and the heavy hydrocarbon separation and gas recovery device 9; a second pressure transmitter 13, a fourth electric valve 14 and a third pressure transmitter 15 are sequentially arranged on a pipeline connecting the heavy hydrocarbon separation and gas recovery device 9 with the gas-liquid separation and gas recovery device 16; and a fourth pressure transmitter 20 and a sixth electric valve 21 are sequentially arranged on a pipeline connecting the gas-liquid separation and gas recovery device 16 and a steam turbine 22.
A first liquid level meter 10 is arranged on one side of the first horizontal two-phase separator 11, and a third electric valve 12 is arranged at a bottom flow port of the first horizontal two-phase separator 11; a second liquid level meter 17 is arranged on one side of the second horizontal two-phase separator 18, and a fifth electric valve 19 is arranged at the underflow port of the second horizontal two-phase separator 18.
A seventh electric valve 24 and a second gas mass flow meter 23 are sequentially arranged on a gas outlet pipeline of the steam turbine 22, and a pipeline interface connected with an external pipeline is reserved on the second gas mass flow meter 23.
The shaft of the turbine 22 is connected to a generator 26 via a magnetic coupling 25.
Example 2
The technical solution of example 1 is adopted, and:
the gas-liquid separation and gas recovery device 16 is consistent with the heavy hydrocarbon separation and gas recovery device 9 in structure and function principle.
Example 3
The technical solution of example 1 is adopted, and:
the first electric valve 3 is automatically switched on and off by receiving a feedback signal of the level meter 5 so as to clean separated solid and liquid.
Example 4
The technical solution of example 1 is adopted, and:
the contraction and expansion type nozzle 903 is externally provided with an injection backflow cavity 904, and the outlet diffusion section 907 is externally provided with a separation cavity 906.
Example 5
The technical solution of embodiment 1 is adopted, and:
in heavy hydrocarbon separation and gaseous recovery unit 9 again, the natural gas gets into behind the gas inlet cavity 901, add through swirler 902 and revolve and with higher speed through contraction and expansion type nozzle 903 throttle decompression, form the negative pressure zone in contraction and expansion type nozzle 903 exit, the heavy hydrocarbon condenses for the liquid droplet because of rapid cooling condensation, and flow along the pipe wall under centrifugal force, and the natural gas then flows in the middle of the pipeline, separate heavy hydrocarbon and natural gas through separation chamber 906, the heavy hydrocarbon gets into first horizontal two-phase separator 11 through separation mouth 908 and carries out the secondary separation, the natural gas of escape is retrieved through drawing injection backward flow mouth 909.
Example 6
The technical solution of example 1 is adopted, and:
through pressure around first pressure transmitter 8 and 13 real-time supervision heavy hydrocarbon separation of second pressure transmitter and the gaseous recovery unit 9, fourth electric valve 14 realizes the automatic regulation and control to detecting pressure differential in heavy hydrocarbon separation and the gaseous recovery unit 9 through first pressure transmitter 8 and 13 feedback signal of second pressure transmitter, guarantees 9 working property of heavy hydrocarbon separation and gaseous recovery unit.
Through pressure around third pressure transmitter 15 and the real-time supervision gas-liquid separation of fourth pressure transmitter 20 and the gaseous recovery unit 16, sixth electric valve 21 realizes the automatic regulation and control to detecting pressure differential in heavy hydrocarbon separation and the gaseous recovery unit 16 through third pressure transmitter 15 and the 20 feedback signal of fourth pressure transmitter, guarantees 16 working property of heavy hydrocarbon separation and gaseous recovery unit.
Example 7
The technical solution of example 1 is adopted, and:
the level meter 5 is combined with the first electric valve 3, the first liquid level meter 10 is combined with the third electric valve 12, and the second liquid level meter 17 is combined with the fifth electric valve 19, so that the liquid level monitoring and the automatic liquid drainage of the vertical three-phase separator 4, the first horizontal two-phase separator 11 and the second horizontal two-phase separator 18 are sequentially realized.
Example 8
The technical solution of example 1 is adopted, and:
the purified natural gas drives the steam turbine 22 to rotate, the steam turbine 22 drives the generator 26 to generate electricity through the magnetic coupling 25, and the problem of dynamic sealing of the high-pressure natural gas power generation device is effectively solved.
The electric energy generated by the generator 26 is stored by the storage battery 27 and supplies power to electrical elements in the pipeline, so that the real-time monitoring and automatic control of the system are realized.
Example 9
The technical solution of example 1 is adopted, and:
the vertical three-phase separator 4, the heavy hydrocarbon separation and gas recycling device 9, the first horizontal two-phase separator 11, the gas-liquid separation and gas recycling device 16 and the second horizontal two-phase separator 18 are adopted to realize pre-separation treatment and dehydrocarbon dehydration of high-pressure natural gas, and the problem of ice blockage possibly generated in the depressurization process is effectively solved.
Example 10
The technical solution of example 1 is adopted, and:
the gas-liquid separation and gas recovery device (16) is consistent with the structure and the functional principle of the heavy hydrocarbon separation and gas recovery device (9), when the size of the shrinking and expanding nozzle 903 is determined through the dew point of hydrocarbon, the gas-liquid separation and gas recovery device (16) is used for separating free water in natural gas and recovering partial natural gas, and when the size of the shrinking and expanding nozzle 903 is determined through the dew point, the gas-liquid separation and gas recovery device (9) is used for separating heavy hydrocarbon in natural gas and recovering partial natural gas.
Specifically, the size design of the internal contraction and expansion type nozzle 903 of the heavy hydrocarbon separation and gas recovery device 9 is determined by a hydrocarbon dew point, the size design of the internal contraction and expansion type nozzle 903 of the gas-liquid separation and gas recovery device 16 is determined by a water dew point, the hydrocarbon dew point is different from the water dew point, and the size of the contraction and expansion type nozzle 903 is different, so that the heavy hydrocarbon separation and gas recovery device 9 is used for separating heavy hydrocarbon, and the gas-liquid separation and gas recovery device 16 is used for separating water vapor.
In conclusion, the invention adopts an integral skid-mounted design, and is convenient to install and transport; the multi-stage separation and purification is adopted to realize dehydration and dealkylation of natural gas, thereby effectively solving the problem of ice blockage in the pressure reduction process; electric elements such as a liquid level meter, an electric valve and the like are installed to form a feedback type automatic control system, so that real-time monitoring of the process is realized, system automation is realized through feedback control, and automation of the mining process is realized; the non-contact transmission is adopted for power generation, so that the problem of high-pressure dynamic sealing of the power generation device is effectively solved, and meanwhile, a power source can be provided for electrical elements.
Claims (10)
1. The utility model provides a well head high pressure natural gas self-purification and step-down power generation system which characterized in that: the system adopts an integral skid-mounted structure and comprises a natural gas wellhead gas production tree (1), a vertical three-phase separator (4), a recovery device, a steam turbine (22), a generator (26) and a storage battery (27), which are sequentially connected, wherein the recovery device comprises a heavy hydrocarbon separation and gas recovery device (9) and a gas-liquid separation and gas recovery device (16) connected with the heavy hydrocarbon separation and gas recovery device (9), and the heavy hydrocarbon separation and gas recovery device (9) and the gas-liquid separation and gas recovery device (16) have the same structure; the heavy hydrocarbon separation and gas recovery device (9) is connected with a first horizontal two-phase separator (11) for re-separation of heavy hydrocarbon and natural gas, and the gas-liquid separation and gas recovery device (16) is connected with a second horizontal two-phase separator (18) for re-separation of free water, gas and natural gas.
2. The wellhead high-pressure natural gas automatic purification and depressurization power generation system according to claim 1, wherein: heavy hydrocarbon separation and gas recovery unit (9) include stationary flow section (905), and the one end intercommunication of stationary flow section (905) has separation chamber (906) and export diffusion section (907), and the other end intercommunication has to draw and penetrates backward flow chamber (904) and is used for gas decompression accelerating contraction and expansion type nozzle (903).
3. The wellhead high-pressure natural gas automatic purification and depressurization power generation system according to claim 2, characterized in that: an injection backflow port (909) is arranged on the contraction and expansion type nozzle (903), and a separation port (908) is arranged on the separation cavity (906).
4. The wellhead high-pressure natural gas automatic purification and depressurization power generation system according to claim 2, wherein: the inlet end of the contraction and expansion type nozzle (903) is connected with an inlet chamber (901), and a cyclone (902) for adding swirling natural gas is arranged in the inlet chamber (901).
5. The wellhead high-pressure natural gas automatic purification and depressurization power generation system according to claim 2, wherein: the outlet diffusion section (907) of the heavy hydrocarbon separation and gas recovery device (9) is connected with the inlet chamber (901) of the gas-liquid separation and gas recovery device (16), the inlet chamber (901) of the heavy hydrocarbon separation and gas recovery device (9) is connected with the vertical three-phase separator (4), and the outlet diffusion section (907) of the gas-liquid separation and gas recovery device (16) is connected with the steam turbine (22); the separation port (908) and the injection reflux port (909) of the heavy hydrocarbon separation and gas recovery device (9) are connected with the first horizontal two-phase separator (11) through flanges, and the separation port (908) and the injection reflux port (909) of the gas-liquid separation and gas recovery device (16) are connected with the second horizontal two-phase separator (18) through flanges.
6. The wellhead high-pressure natural gas automatic purification and depressurization power generation system according to claim 1, wherein: a manual control valve (2) for bottom hole pressure regulation and protection is arranged between the natural gas wellhead gas production tree (1) and the vertical three-phase separator (4) for primary gas-solid-liquid separation; one side of the vertical three-phase separator (4) is provided with a level meter (5) for detecting the amount of solid liquid and feeding back related signals, and a bottom flow port of the vertical three-phase separator (4) is provided with a first electric valve (3) for cleaning and separating solid and liquid.
7. The wellhead high-pressure natural gas automatic purification and depressurization power generation system according to claim 1, wherein: a second electric valve (6), a first gas mass flowmeter (7) and a first pressure transmitter (8) are sequentially arranged on a pipeline connected with the vertical three-phase separator (4) and the heavy hydrocarbon separation and gas recovery device (9); a second pressure transmitter (13), a fourth electric valve (14) and a third pressure transmitter (15) are sequentially arranged on a pipeline connecting the heavy hydrocarbon separation and gas recovery device (9) with the gas-liquid separation and gas recovery device (16); and a fourth pressure transmitter (20) and a sixth electric valve (21) are sequentially arranged on a pipeline connecting the gas-liquid separation and gas recovery device (16) and the steam turbine (22).
8. The wellhead high-pressure natural gas automatic purification and depressurization power generation system according to claim 1, wherein: a first liquid level meter (10) is arranged on one side of the first horizontal two-phase separator (11), and a third electric valve (12) is arranged at a bottom flow port of the first horizontal two-phase separator (11); a second liquid level meter (17) is arranged on one side of the second horizontal two-phase separator (18), and a fifth electric valve (19) is arranged at the underflow port of the second horizontal two-phase separator (18).
9. The wellhead high-pressure natural gas automatic purification and depressurization power generation system according to claim 1, wherein: and a seventh electric valve (24) and a second gas mass flow meter (23) are sequentially arranged on a gas outlet pipeline of the steam turbine (22), and a pipeline interface connected with an external pipeline is reserved on the second gas mass flow meter (23).
10. The wellhead high-pressure natural gas automatic purification and depressurization power generation system according to claim 1, wherein: and a rotating shaft of the steam turbine (22) is connected with a generator (26) through a magnetic coupling (25).
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