CN109779574B - Natural gas hydrate exploitation system and method based on wind power compensation - Google Patents
Natural gas hydrate exploitation system and method based on wind power compensation Download PDFInfo
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- CN109779574B CN109779574B CN201910223795.5A CN201910223795A CN109779574B CN 109779574 B CN109779574 B CN 109779574B CN 201910223795 A CN201910223795 A CN 201910223795A CN 109779574 B CN109779574 B CN 109779574B
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- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000007789 gas Substances 0.000 claims description 62
- 238000000926 separation method Methods 0.000 claims description 37
- 238000002347 injection Methods 0.000 claims description 29
- 239000007924 injection Substances 0.000 claims description 29
- 238000010248 power generation Methods 0.000 claims description 28
- 238000005485 electric heating Methods 0.000 claims description 25
- 239000013535 sea water Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 238000000746 purification Methods 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 14
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 14
- 230000001133 acceleration Effects 0.000 claims description 13
- 230000005540 biological transmission Effects 0.000 claims description 13
- 238000002485 combustion reaction Methods 0.000 claims description 11
- 238000000354 decomposition reaction Methods 0.000 claims description 8
- 239000003345 natural gas Substances 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000001737 promoting effect Effects 0.000 claims description 3
- 230000032258 transport Effects 0.000 claims description 3
- 238000005065 mining Methods 0.000 claims description 2
- 238000005553 drilling Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 150000004677 hydrates Chemical class 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- -1 alkane compounds Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000013000 chemical inhibitor Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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Abstract
The invention discloses a natural gas hydrate exploitation system and a natural gas hydrate exploitation method based on wind power compensation, which belong to the field of sea natural gas hydrate exploitation and comprise a wind power plant, an auxiliary device, an ocean platform system and an underground exploitation system which are sequentially connected.
Description
Technical Field
The invention relates to the field of sea area natural gas hydrate exploitation, in particular to a natural gas hydrate exploitation system and method based on wind power compensation.
Background
With the development of economic society, the problem of energy shortage becomes one of the main problems restricting economic development, natural gas hydrate is clean energy, is an ice-shaped and cage-shaped crystal compound formed by water and micromolecular alkane compounds under the conditions of high pressure and ground temperature, the combustion products of the natural gas hydrate are mainly water and carbon dioxide, and the natural gas hydrate is cleaner to coal-fired power generation and has better distributionThe natural gas hydrate is mainly distributed at the bottom of the ocean in a layered mode, and the seabed seepage characteristic is complex and difficult to exploit. The current better natural gas hydrate main exploitation methods comprise: heating method, depressurization method, chemical inhibitor method and CO2-CH4The replacement method has economic exploitation prospect in a mode of jointly using a depressurization method and a heating method, however, the heating method needs to invest a large amount of thermal resources, the reservoir range of the natural gas hydrate is extremely large, and the required thermal resources are also very high.
Wind energy is a clean energy, refers to kinetic energy generated by the flow of a large amount of air on the earth surface, is abundant in resources and has great development potential. In recent years, the capacity of a fan is increased year by year, but the unstable power generation of the fan causes grid connection difficulty, large-scale wind abandon is caused, and the waste of power resources and fan resources is caused. In recent years, the installed capacity of wind power generation equipment in China is increased year by year, the phenomenon of large-scale domestic 'wind abandon' is relieved in nearly two years, but the 'wind abandon' rate is still very high.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a natural gas hydrate exploitation system and method based on wind power compensation, which utilize 'wind abandoning' of a wind power generation device to the exploitation process of the natural gas hydrate, increase energy sources in the exploitation process of the natural gas hydrate, improve the energy utilization rate and effectively solve the problem of electric energy and heat energy supply in the exploitation process of the natural gas hydrate.
The technical scheme adopted by the invention for solving the technical problem is as follows: a natural gas hydrate exploitation system based on wind power compensation comprises a wind power plant and auxiliary device, an ocean platform system and an underground exploitation system which are sequentially connected, wherein the wind power plant and auxiliary device comprises a wind power plant, an inversion and rectification device, a step-up transformer and a step-down transformer which are sequentially connected;
the ocean platform system comprises a storage battery and N2Separator, thermal power generation device, controller, gas storage device and accelerating pumpa. The device comprises a purification device, a gas-water separation device, an electric heating device and an accelerating pump b, wherein a first output end of the electric heating device is connected with a first output end of a storage battery, and a second output end of the storage battery is connected with N2The separation device is connected, the third output end of the storage battery is connected with the second output end of the controller, and N is2The separation device is connected with the thermal power generation device, the thermal power generation device is connected with the first output end of the controller, the third output end of the controller is connected with the gas storage device, the gas-water separation device is connected with the purification device, and the purification device is connected with the gas storage device;
the underground mining system comprises an injection well, a gas producing well and wellhead equipment, wherein the injection well comprises a vertical section and a horizontal section, and the wellhead of the vertical section is respectively connected with one end of an accelerating pump b and N2The other end of the acceleration pump b is connected with the electric heating device; the horizontal section is of a sleeve structure and comprises an inner sleeve and an outer sleeve; the wellhead end of the gas production well is connected with wellhead equipment, and the wellhead equipment is connected with a gas-water separation device;
further, N2The separation device comprises a separation tank, a compressor and a filter which are connected in sequence through a power transmission cable; the thermal power generation device comprises a generator, a gas turbine and a combustion chamber which are sequentially connected through a power transmission cable, and a spray pipe is arranged between the gas turbine and the combustion chamber;
the first output end of the step-down transformer is connected with the storage battery, and the second output end of the step-down transformer is connected with N2The third output end of the step-down transformer is connected with the electric heating device; and a flowmeter is arranged between the gas storage device and the purification device.
Further, the first output end of the controller and the acceleration pump a are both connected with a combustion chamber of the thermal power generation device; the wellhead of the injection well vertical section is connected to a power transmission cable between the generator and the gas turbine.
A natural gas hydrate exploitation method based on wind power compensation comprises the following steps:
s1, a fan of the wind power plant is driven by wind power, the blade generates rotating torque, current is generated, and the current flows to a step-up transformer after flowing through an inversion and rectification device to carry out voltage boosting;
s2: the current passing through the step-up transformer is transmitted with electric energy through a transmission cable and flows to the step-down transformer for step-down;
s3: one end of the current which is reduced by the step-down transformer flows into the electric heating device, and the electric heating device converts the current into heat energy through electric heat conversion and injects the heat energy into the seawater to heat the seawater; the other end of the current which is reduced by the step-down transformer flows into N2Separation apparatus, process N2Separation device for separating out N2Providing a gas source; one end of the current reduced by the step-down transformer flows into the storage battery to store the residual electric energy;
s4: using N for injection wells by alternating injection2Breaking the phase equilibrium partial pressure of the natural gas hydrate reservoir, promoting the decomposition when N is2When the gas production capacity is reduced, hot seawater is quickly injected, the heat transfer rate of a reservoir is increased, heat required by phase change is provided, and the gas production efficiency is increased;
s5: the gas separated by the gas-water separation device is separated from the natural gas through the purification device and transferred into the gas storage device, and the gas storage device transports the natural gas to the thermal power generation device so as to provide electric energy required by the ocean platform system;
s6: the gas burned by the gas turbine is used as a gas source of an injection well and is injected into a natural gas hydrate reservoir, and the gas has certain heat, so that heat energy required by the reservoir can be provided, and circulation is formed.
Further, the specific step of step S3 is that the seawater heated by the electric heating device is accelerated by the acceleration pump b and injected into the injection well to flow to the reservoir of the natural gas hydrate, the inner sleeve of the horizontal section of the injection well injects hot seawater, and the outer sleeve injects N2。
The invention has the beneficial effects that: the 'abandoned wind' generated by the wind power generation device is utilized to the exploitation process of the natural gas hydrate, so that the energy source in the exploitation process of the natural gas hydrate is increased, the energy utilization rate is improved, and the problems of electric energy resource waste caused by abandonment of wind power and electricity and heat supply in the exploitation process of the natural gas hydrate are solved; the seawater heated by the electric heating device is injected into the natural gas hydrate reservoir, and the high-temperature seawater exchanges heat with the natural gas hydrate reservoir, so that heat required by hydrate decomposition in the reservoir can be provided, the hydrate decomposition is accelerated, and the exploitation efficiency is improved.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
The reference numbers in the figures are as follows: 1. the device comprises an inversion and rectification device, 2, a wind power plant, 3, a step-up transformer, 4, a step-down transformer, 5, a storage battery, 6, a separation tank, 7, a compressor, 8, a filter, 9, a generator, 10, a gas turbine, 11, a combustion chamber, 12, a controller, 13, a gas storage device, 14, acceleration pumps a, 15, a purification device, 16, a gas-water separation device, 17, an electric heating device, 18, acceleration pumps b, 19, an injection well, 20, a gas production well, 21, a flowmeter, 22 and a spray pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
Example 1
The embodiment provides a natural gas hydrate exploitation system based on wind power compensation, which comprises a wind power plant and auxiliary device, an ocean platform system and an underground exploitation system which are sequentially connected, wherein the wind power plant and auxiliary device comprises a wind power plant 2, an inversion and rectification device 1, a boosting transformer 3 and a step-down transformer 4 which are sequentially connected;
the ocean platform system comprises storage batteries 5 and N2The device comprises a separation device, a thermal power generation device, a controller 12, a gas storage device 13, an acceleration pump a14, a purification device 15, a gas-water separation device 16, an electric heating device 17 and an acceleration pump b18, wherein a first output end of the electric heating device 17 is connected with a first output end of a storage battery 5, and a second output end of the storage battery 5 is connected with N2The separation device is connected, the third output end of the storage battery 5 is connected with the second output end of the controller 12, and N is2The separation device is connected with the thermal power generation device,the thermal power generation device is connected with a first output end of the controller 12, a third output end of the controller 12 is connected with the gas storage device 13, the gas storage device 13 is connected with the thermal power generation device through an accelerating pump a14, the gas-water separation device 16 is connected with the purification device 15, and the purification device 15 is connected with the gas storage device 13;
the underground production system comprises an injection well 19, a gas production well 20 and wellhead equipment, wherein the injection well 19 comprises a vertical section and a horizontal section, and the wellheads of the vertical section are respectively connected with one end of an accelerating pump b18 and N2The other end of the acceleration pump b18 is connected with the electric heating device 17; the horizontal section is of a sleeve structure and comprises an inner sleeve and an outer sleeve; the wellhead end of the gas production well 20 is connected with wellhead equipment, and the wellhead equipment is connected with a gas-water separation device 16;
preferably, the connections are all connected by a power transmission cable.
N2The separation device comprises a separation tank 6, a compressor 7 and a filter 8 which are connected in sequence through a power transmission cable; the thermal power generation device comprises a generator 9, a gas turbine 10 and a combustion chamber 11 which are connected in sequence through a power transmission cable, and a spray pipe 22 is arranged between the gas turbine 10 and the combustion chamber 11;
the first output end of the step-down transformer 4 is connected with the storage battery 5, and the second output end of the step-down transformer 4 is connected with N2The separation device is connected, and the third output end of the step-down transformer 4 is connected with the electric heating device 17; a flowmeter 21 is arranged between the gas storage device 13 and the purification device 15.
The first output end of the controller 12 and the acceleration pump a14 are both connected with the combustion chamber 11 of the thermal power generation device; the wellhead of the vertical section of the injection well 19 is connected to the transmission cable between the generator 9 and the gas turbine 10.
Preferably, the downhole production system in the embodiment further comprises a tubular drilling rig, a directional device and a jet flow nozzle while drilling, the injection well 19 comprises a vertical section and a horizontal section, and a vertical horizontal well drilling combination mode is adopted, so that a water injection area is enlarged, and the large-range rapid decomposition of the natural gas hydrate is facilitated; the horizontal section of the injection well 19 is arranged in the natural gasIn the middle of the hydrate reservoir, a sleeve structure is adopted, so that the heat source and N can be conveniently injected in a large range2。
N injection into natural gas hydrate reservoirs2The phase equilibrium partial pressure is broken, the decomposition of the hydrate is promoted, and the exploitation efficiency is improved; the thermal power generation device provides a power supply for the ocean platform system, the power shortage caused in the wind power generation valley is avoided, the hydrate reservoir is injected with the exhaust gas discharged by the electric heating device 17, the heat required in the decomposition process of a part of hydrates can be provided, the natural gas sealed and stored by the hydrates can be displaced, the exploitation efficiency is improved, and the zero emission is realized. Preferably, in this embodiment, the gas-water separation device 16 and the electric heating device 17 are both directly connected to the seawater.
Example 2
The embodiment provides a natural gas hydrate exploitation method based on wind power compensation, which comprises the following steps:
s1, the fan of the wind power plant 2 is driven by wind power, the blade generates rotating torque, current is generated, flows to the step-up transformer 3 after flowing through the inversion and rectification device 1, and voltage is boosted;
s2: the current passing through the step-up transformer 3 is transmitted with electric energy through a transmission cable and flows to the step-down transformer 4 for step-down;
s3: one end of the current which is reduced by the step-down transformer 4 flows into the electric heating device 17, and the electric heating device 17 converts the current into heat energy through electric heat conversion and injects the heat energy into the seawater to heat the seawater; the other end of the current which is reduced by the step-down transformer 4 flows into N2Separation apparatus, process N2Separation device for separating out N2Providing a gas source; the other end of the current reduced by the step-down transformer 4 flows into the storage battery 5 to store the residual electric energy;
s4: using N for the injection well 19 in an alternating injection pattern2Breaking the phase equilibrium partial pressure of the natural gas hydrate reservoir, promoting the decomposition when N is2When the gas production capacity is reduced, hot seawater is quickly injected, the heat transfer rate of a reservoir is increased, heat required by phase change is provided, and the gas production efficiency is increased;
s5: the gas separated by the gas-water separation device 16 is separated from natural gas by the purification device 15 and transferred to the gas storage device 13, and the gas storage device 13 transports the natural gas to the thermal power generation device to be used as energy to provide electric energy required by the ocean platform system through the thermal power generation process of the thermal power generation device;
s6: the gas burned by the gas turbine 10 is used as a gas source for the injection well 19 and is injected into the natural gas hydrate reservoir, and the gas has a certain amount of heat, so that heat energy required by the reservoir can be provided, and circulation is formed.
The specific steps of step S3 are that the seawater heated by the electric heating device 17 is accelerated by the acceleration pump b18 and injected into the injection well 19 to flow to the reservoir of the natural gas hydrate, the inner sleeve of the horizontal section of the injection well 19 is injected with hot seawater, and the outer sleeve is injected with N2。
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (4)
1. A natural gas hydrate exploitation system based on wind power compensation is characterized by comprising a wind power plant and auxiliary device, an ocean platform system and an underground exploitation system which are sequentially connected, wherein the wind power plant and auxiliary device comprises a wind power plant (2), an inversion and rectification device (1), a step-up transformer (3) and a step-down transformer (4) which are sequentially connected;
the ocean platform system comprises a storage battery (5) and N2The device comprises a separation device, a thermal power generation device, a controller (12), a gas storage device (13), an accelerating pump a (14), a purification device (15), a gas-water separation device (16), an electric heating device (17) and an accelerating pump b (18), wherein a first output end of the electric heating device (17) is connected with a first output end of a storage battery (5), and a second output end of the storage battery (5) is connected with N2The separation device is connected, the third output end of the storage battery (5) is connected with the second output end of the controller (12), and N is2Separation device and heat power generatorThe device comprises an electric device, a thermal power generation device, a controller (12), a gas storage device (13), an acceleration pump a (14), a gas-water separation device (16), a purification device (15) and a purification device (13), wherein the thermal power generation device is connected with a first output end of the controller (12), a third output end of the controller (12) is connected with the gas storage device (13);
the underground mining system comprises an injection well (19), a gas production well (20) and wellhead equipment, wherein the injection well (19) comprises a vertical section and a horizontal section, and the wellhead of the vertical section is respectively connected with one end of an accelerating pump b (18), N2The other end of the acceleration pump b (18) is connected with an electric heating device (17); the horizontal section is of a sleeve structure and comprises an inner sleeve and an outer sleeve; the wellhead end of the gas production well (20) is connected with wellhead equipment, and the wellhead equipment is connected with a gas-water separation device (16);
N2the separation device comprises a separation tank (6), a compressor (7) and a filter (8) which are connected in sequence through a power transmission cable; the thermal power generation device comprises a power generator (9), a gas turbine (10) and a combustion chamber (11) which are connected in sequence through a power transmission cable, and a spray pipe (22) is arranged between the gas turbine (10) and the combustion chamber (11);
the first output end of the step-down transformer (4) is connected with the storage battery (5), and the second output end of the step-down transformer (4) is connected with N2The separation device is connected, and the third output end of the step-down transformer (4) is connected with the electric heating device (17); and a flowmeter (21) is arranged between the gas storage device (13) and the purification device (15).
2. A natural gas hydrate exploitation system based on wind power compensation according to claim 1, wherein the first output end of the controller (12) and the acceleration pump a (14) are both connected with a combustion chamber (11) of the thermal power generation device; the wellhead of the vertical section of the injection well (19) is connected to a transmission cable between the generator (9) and the gas turbine (10).
3. The natural gas hydrate exploitation system based on wind power compensation according to claim 2, wherein the exploitation method based on the system comprises the following steps:
s1, a fan of the wind power plant (2) is driven by wind power, the blade generates rotating torque, current is generated, flows through the inversion and rectification device (1) and then flows to the step-up transformer (3), and voltage is boosted;
s2: the current passing through the step-up transformer (3) is transmitted by electric energy through a power transmission cable and flows to the step-down transformer (4) for step-down;
s3: one end of the current reduced by the step-down transformer (4) flows into the electric heating device (17), and the electric heating device (17) converts the current into heat energy through electric heat conversion and injects the heat energy into the seawater to heat the seawater; the other end of the current reduced by the step-down transformer (4) flows into N2Separation apparatus, process N2Separation device for separating out N2Providing a gas source; the other end of the current reduced by the step-down transformer (4) flows into the storage battery (5) to store the residual electric energy;
s4: using N for the injection wells (19) in an alternating injection mode2Breaking the phase equilibrium partial pressure of the natural gas hydrate reservoir, promoting the decomposition when N is2When the gas production capacity is reduced, hot seawater is quickly injected, the heat transfer rate of a reservoir is increased, heat required by phase change is provided, and the gas production efficiency is increased;
s5: the gas separated by the gas-water separation device (16) is purified by the purification device (15) to separate natural gas and is transferred to the gas storage device (13), and the gas storage device (13) transports the natural gas to the thermal power generation device so as to provide electric energy required by the ocean platform system;
s6: the gas combusted by the gas turbine (10) is used as a gas source of an injection well (19) and is injected into a natural gas hydrate reservoir, and the gas has certain heat and can provide heat energy required by the reservoir to form a cycle.
4. Natural wind power compensation based on claim 3The gas hydrate exploitation system is characterized in that seawater heated by the electric heating device (17) is accelerated by the accelerating pump b (18) and then injected into the injection well (19) to flow to a reservoir of the natural gas hydrate, hot seawater is injected into an inner sleeve of the horizontal section of the injection well (19), and N is injected into an outer sleeve2。
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| CN106593372A (en) * | 2016-12-07 | 2017-04-26 | 大连理工大学 | Solar-technology-based natural gas hydrate exploitation and sea water desalination method and apparatus |
| CN106968644A (en) * | 2017-03-24 | 2017-07-21 | 青岛海洋地质研究所 | A kind of Gas Hydrate In Sea Areas hot extractor based on thermal generator |
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