CN117867543A - Marine application combustible ice and wind power complementary ammonia production system and method - Google Patents
Marine application combustible ice and wind power complementary ammonia production system and method Download PDFInfo
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- CN117867543A CN117867543A CN202311802679.1A CN202311802679A CN117867543A CN 117867543 A CN117867543 A CN 117867543A CN 202311802679 A CN202311802679 A CN 202311802679A CN 117867543 A CN117867543 A CN 117867543A
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 160
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 95
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000000295 complement effect Effects 0.000 title claims abstract description 17
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 200
- 238000003860 storage Methods 0.000 claims abstract description 152
- 239000003345 natural gas Substances 0.000 claims abstract description 100
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 92
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 90
- 239000001257 hydrogen Substances 0.000 claims abstract description 90
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 90
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 81
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 79
- 239000001301 oxygen Substances 0.000 claims abstract description 79
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 79
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 45
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 45
- 238000000926 separation method Methods 0.000 claims abstract description 41
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 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 claims abstract description 26
- 238000010248 power generation Methods 0.000 claims abstract description 18
- 238000002485 combustion reaction Methods 0.000 claims abstract description 13
- 230000005611 electricity Effects 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 78
- 239000003949 liquefied natural gas Substances 0.000 claims description 40
- 239000013505 freshwater Substances 0.000 claims description 22
- 238000002309 gasification Methods 0.000 claims description 16
- 239000013535 sea water Substances 0.000 claims description 14
- 238000005868 electrolysis reaction Methods 0.000 claims description 12
- 238000005553 drilling Methods 0.000 claims description 10
- 238000000746 purification Methods 0.000 claims description 7
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- 229910001873 dinitrogen Inorganic materials 0.000 claims description 3
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- 150000002430 hydrocarbons Chemical class 0.000 claims description 3
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- 230000002194 synthesizing effect Effects 0.000 claims description 3
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- 230000009919 sequestration Effects 0.000 claims 2
- 230000018044 dehydration Effects 0.000 claims 1
- 238000006297 dehydration reaction Methods 0.000 claims 1
- 238000007789 sealing Methods 0.000 abstract description 10
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- 239000003570 air Substances 0.000 description 35
- 238000005516 engineering process Methods 0.000 description 9
- 229910052799 carbon Inorganic materials 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
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Abstract
A system and a method for preparing ammonia by using flammable ice and wind power complementation at sea relate to the technical field of energy utilization, utilize offshore wind energy and natural gas hydrate to generate electricity in a combined way, transmit electric energy to a storage battery pack, electrolyze water through an electrolytic hydrogen production device to generate hydrogen and oxygen; separating nitrogen and oxygen in the air by a separation device, and extracting the nitrogen and the oxygen in the air; the oxygen generated by the electrolytic hydrogen production device and the air separation device is used in the natural gas hydrate combustion power generation process, and the generated hydrogen and nitrogen are synthesized into ammonia gas so as to be convenient to convey. The system disclosed by the invention can combine and utilize the natural gas hydrate exploitation power generation with the offshore wind power, and realize the integration of natural gas hydrate exploitation, natural gas and offshore wind power complementary power generation, hydrogen production and ammonia production, carbon dioxide trapping and sealing.
Description
Technical Field
The invention relates to the technical field of energy utilization, in particular to a system and a method for preparing ammonia by using flammable ice and wind power complementation in the sea.
Background
Under the dual pressures of increasing energy demands and achieving the "two carbon" goal, the development of clean energy is urgent. Hydrogen energy has unique advantages, and future hydrogen cycles will necessarily assist the carbon cycle in achieving the "two carbon" goal. Electrolytic processes are the most commonly used industrial hydrogen production processes. The method mainly utilizes the reducibility of water, utilizes the electrolysis principle to electrolyze the water into hydrogen and oxygen, and hardly generates pollutants. The purity of the obtained hydrogen can reach more than 95 percent, and the method is the simplest and practical industrial hydrogen production method. The wind power hydrogen production technology is a hydrogen production technology which directly applies electric energy generated by wind power generation to water electrolysis hydrogen production. The wind power generation can effectively replace the traditional fossil energy power generation, reduce the energy consumption and slow down the greenhouse effect.
The publication number CN116345703A discloses a comprehensive energy system for producing hydrogen based on offshore wind power, which comprises an offshore wind power generator set, a grid-connected bus module and an electrolytic water hydrogen production platform, and is used for producing hydrogen by utilizing offshore wind power. According to the technical scheme, although the problem of possible digestion caused by wind power can be solved, the wind power is related to seasons and weather relatives, has natural randomness and fluctuation, and can not stably output hydrogen energy.
Disclosure of Invention
In view of the above, the invention discloses a system and a method for preparing ammonia by using flammable ice and wind power complementation at sea, which comprises the following specific scheme:
an offshore application combustible ice and wind power complementary ammonia production system, comprising:
an offshore wind farm for wind power generation and for transmitting electrical energy to a battery pack;
a natural gas hydrate extraction unit for extracting natural gas hydrate and delivering the natural gas to a gas turbine generator;
the gas turbine generator is connected with the natural gas hydrate exploitation unit, is used for generating power by combusting natural gas and transmitting electric energy to the storage battery pack;
a battery pack for storing electric energy;
the electrolytic hydrogen production device is connected with the storage battery pack, and performs electrolytic water reaction by utilizing electric energy to generate hydrogen and oxygen;
the first oxygen storage tank is connected with the electrolytic hydrogen production device and is used for storing oxygen generated by the electrolytic hydrogen production device; the first oxygen storage tank is also connected with the gas turbine generator and is used for conveying oxygen to the gas turbine generator;
the hydrogen storage tank is connected with the electrolytic hydrogen production device and is used for storing hydrogen generated by the electrolytic hydrogen production device; the hydrogen storage tank is also connected with the ammonia production device and used for conveying hydrogen to the ammonia production device;
the air separation device is connected with the storage battery pack, and utilizes electric energy provided by the storage battery pack to separate nitrogen and oxygen in the air and extract the nitrogen and the oxygen in the air;
the second oxygen storage tank is connected with the air separation device and used for storing oxygen extracted by the air separation device, and the second oxygen storage tank is connected with the sea gas turbine generator and used for conveying oxygen to the gas turbine generator;
the nitrogen storage tank is connected with the air separation device and is used for storing nitrogen extracted by the air separation device, and the nitrogen storage tank is also connected with the ammonia production device and is used for conveying the nitrogen to the ammonia production device;
an ammonia production device for producing ammonia gas.
The natural gas hydrate exploitation unit comprises a well drilling exploitation device and a natural gas purification device, wherein the well drilling exploitation device is used for exploiting natural gas hydrate, and the natural gas purification device is connected with the well drilling exploitation device and is used for removing impurity gas, water and partial liquid phase light hydrocarbon in unprocessed natural gas.
As a supplement to the technical proposal of the invention, the invention also comprises:
the natural gas compressor is connected with the natural gas purifying device and used for compressing natural gas into the liquefied natural gas storage tank;
an lng storage tank for storing natural gas.
The liquefied natural gas gasification cold energy utilization system is respectively connected with the liquefied natural gas storage tank and the air separation device and is used for conveying cold energy generated in the natural gas conveying process in the liquefied natural gas storage tank to the air separation device.
The mechanical energy utilization system of the gas turbine is respectively connected with the gas turbine generator and the natural gas compressor, and the mechanical energy generated by the gas turbine in the gas turbine generator is partially used for the natural gas compressor, so that the natural gas compressor compresses natural gas by using the mechanical energy.
As a supplement to the technical proposal of the invention, the invention also comprises:
the seawater desalination device is connected with the fresh water storage tank and is used for carrying out desalination treatment on seawater and conveying the desalted seawater into the fresh water storage tank;
the fresh water storage tank is connected with the electrolytic hydrogen production device and used for storing fresh water after the sea water desalination device and conveying the fresh water to the electrolytic hydrogen production device.
As a supplement to the technical proposal of the invention, the invention also comprises:
the carbon dioxide trapping device comprises a water removing device, a carbon dioxide compressor and a carbon dioxide storage tank, wherein the water removing device is connected with an exhaust port of a pipeline gas turbine and used for carrying out water removal treatment on waste gas generated after natural gas is combusted, and the carbon dioxide compressor is respectively connected with the water removing device and the carbon dioxide storage tank and used for compressing and storing carbon dioxide in the carbon dioxide storage tank
And the carbon dioxide sealing device is connected with the carbon dioxide storage tank and is used for performing ocean geological sealing on the carbon dioxide.
As a supplement to the technical proposal of the invention, the invention also comprises:
the ammonia compressor is respectively connected with the ammonia preparation device and the liquid ammonia storage tank and is used for compressing ammonia generated by the ammonia preparation device into the liquid ammonia storage tank;
and the liquid ammonia storage tank is used for storing liquid ammonia.
In addition to the technical scheme of the invention, the gas turbine generator comprises a gas turbine and a generator, and the gas turbine is connected with the generator.
The invention also discloses an ammonia production method of the offshore application flammable ice and wind power complementary ammonia production system, which specifically comprises the following steps:
s1, wind power generation is carried out through an offshore wind farm, and electric energy is stored in a storage battery pack;
natural gas is extracted through a natural gas hydrate extraction unit, natural gas is compressed into a liquefied natural gas storage tank by using a natural gas compressor, the liquefied natural gas storage tank conveys gaseous natural gas to a gas turbine generator, and the gas turbine generator generates electricity and stores electric energy in a storage battery pack;
s2, cold energy generated in the gasification process of the liquefied natural gas in the liquefied natural gas storage tank is conveyed to an air separation device through a liquefied natural gas gasification cold energy utilization system, the air separation device separates nitrogen and oxygen in the air through cold energy and electric energy, the oxygen separated by the air separation device is conveyed to a second oxygen storage tank for storage, the nitrogen is conveyed to the nitrogen storage tank for storage, and the oxygen stored in the second oxygen storage tank is conveyed to a gas turbine generator for oxygen-enriched combustion of the natural gas;
s3, the storage battery pack supplies power to the electrolytic hydrogen production device, the electrolytic hydrogen production device carries out electrolysis on water, oxygen generated by electrolysis is conveyed to a first oxygen storage tank for storage, and hydrogen generated by electrolysis is conveyed to a hydrogen storage tank for storage; oxygen stored in the first oxygen storage tank 6 is conveyed into the gas turbine generator, so that natural gas is burnt in an oxygen-enriched mode;
s4, conveying the hydrogen in the hydrogen storage tank and the nitrogen in the nitrogen storage tank into an ammonia production device, and synthesizing ammonia by the ammonia production device from the hydrogen and the nitrogen.
The beneficial effects are that: the invention solves the problem of the traditional offshore wind power generation and digestion by using the natural gas hydrate to generate electricity, realizes stable hydrogen production, and synthesizes and conveys ammonia by hydrogen and nitrogen. Oxygen generated by the electrolysis device and the air separation device is conveyed to the gas turbine generator, so that oxygen-enriched combustion of natural gas is realized, the power generation efficiency is improved, and cold energy generated in the gasification process of the natural gas is conveyed to the air separation device, so that the maximum utilization of energy is realized. Through the setting of carbon dioxide trapping device and sealing device, realize the zero carbon emission of entire system.
Drawings
FIG. 1 is a schematic diagram of an ammonia production system employing combustible ice extraction and offshore wind power complementary type clean energy conversion.
FIG. 2 is a schematic diagram of a carbon dioxide capture device.
In the figure: 1. offshore wind farm, 2. Drilling production unit, 3. Natural gas purification unit, 4. Storage battery, 5. Electrolytic hydrogen production unit, 6. First oxygen storage tank, 7. Hydrogen storage tank, 8. Air separation unit, 9. Second oxygen storage tank, 10. Nitrogen storage tank, 11. Ammonia production unit, 12. Natural gas compressor, 13. Liquefied natural gas storage tank, 14. Sea water desalination unit, 15. Fresh water storage tank, 16. Carbon dioxide capture unit, 17. Water removal unit, 18. Carbon dioxide compressor, 19. Carbon dioxide storage tank, 20. Carbon dioxide seal-up unit, 21. Ammonia compressor, 22. Liquid ammonia storage tank, 23. Gas turbine generator.
Detailed Description
In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The invention discloses an offshore application combustible ice and wind power complementary ammonia production system. The invention relates to a method for producing hydrogen by utilizing combustible ice exploitation and offshore wind energy complementation to obtain hydrogen energy. Because hydrogen has the characteristics of low density and high pressure, the transportation cost is higher, in addition, the hydrogen has the characteristic of inflammability and explosiveness, and strict safety measures are required to be taken, so that the transportation cost is increased, and the invention synthesizes the hydrogen and the ammonia into the ammonia so as to facilitate turnover transportation. As shown in fig. 1 to 2, comprising:
an offshore wind farm 1, which is built offshore for wind power generation, converts wind energy into electrical energy, and transmits the electrical energy to a storage battery 4.
A natural gas hydrate extraction unit for extracting natural gas hydrate in the sea and delivering the extracted natural gas to the gas turbine generator 23.
The gas turbine generator 23 includes a gas turbine for generating power by combusting natural gas, and a generator for generating heat by combusting natural gas in the gas turbine, the gas turbine converting the heat generated by combusting natural gas into mechanical energy and transmitting the mechanical energy to the generator, the generator converting the mechanical energy into electric energy, the generator being connected to the battery pack 4 and transmitting the electric energy to the battery pack 4.
And a battery pack 4 for storing electric energy.
And the electrolytic hydrogen production device 5 is connected with the storage battery 4, the storage battery 4 supplies electric energy to the electrolytic hydrogen production device 5, the electrolytic hydrogen production device 5 performs an electrolytic water reaction by utilizing the electric energy to generate hydrogen and oxygen, the hydrogen is conveyed and stored in the hydrogen storage tank 7, and the oxygen is conveyed and stored in the first oxygen storage tank 6. The first oxygen storage tank 6 is connected with the gas turbine generator 23 and is used for realizing the oxygen-enriched combustion of natural gas in the gas turbine, improving the total heat energy generated by the combustion of the natural gas, further improving the overall power generation efficiency of the gas turbine generator 23 and improving the energy utilization rate. The hydrogen tank 7 is connected to the ammonia production device 11, and supplies hydrogen gas to the ammonia production device 11. The electrolytic hydrogen production device 5 adopts a proton exchange membrane with higher efficiency to electrolyze water to produce hydrogen.
The air separation device 8 is connected with the storage battery 4, utilizes the electric energy provided by the storage battery 4 to separate nitrogen and oxygen in the air, conveys the separated nitrogen into the nitrogen storage tank 10, conveys the separated oxygen into the second oxygen storage tank 9, and the second oxygen storage tank 9 is connected with the gas turbine generator 23 for realizing the oxygen-enriched combustion of natural gas in the gas turbine, improving the total heat energy amount generated by the combustion of the natural gas, further improving the overall power generation efficiency of the gas turbine generator 23 and improving the energy utilization rate. The nitrogen tank 10 is connected to the ammonia production device 11, and supplies nitrogen gas to the ammonia production device 11.
An ammonia production device 11 for producing ammonia gas.
Through the arrangement, the offshore wind energy and the offshore natural gas hydrate are combined to generate electricity, so that the intermittent characteristic of wind energy can be overcome, the natural gas hydrate can be effectively utilized to stably supply power for the hydrogen production and ammonia production unit, and the hydrogen production efficiency is improved. The method solves the problem of the consumption caused by the power grid of the offshore wind power system, and realizes the zero-carbon emission hydrogen production and ammonia production by complementarily utilizing the natural gas hydrate and the offshore wind power. In order to improve the power generation efficiency of the gas turbine generator 23, oxygen generated by the air separation device 8 and oxygen generated by the electrolytic hydrogen production device 5 are both conveyed into the gas turbine generator 23, so that oxygen-enriched combustion of natural gas is realized, more heat energy is generated, and the power generation capacity of the gas turbine generator 23 is improved.
As a preferred technical scheme of the invention, the natural gas hydrate recovery unit further comprises a natural gas compressor 12 and a liquefied natural gas storage tank 13, and the natural gas hydrate recovery unit comprises a well drilling and recovery device 2 and a natural gas purification device 3.
The well drilling exploitation device 2 adopts a relatively mature depressurization method to exploit natural gas hydrate, is based on a deep water drilling platform technology, is fractured to a free gas layer of a hydrate deposit, and is used for pumping the reservoir fluid after devices such as a casing, a shaft, a sand control net and the like are arranged so as to obtain unprocessed natural gas. The natural gas purifying device 3 is used for removing impurity gas, water and partial liquid phase light hydrocarbon in raw natural gas.
The natural gas compressor 12 is connected with the natural gas purifying device 3, the natural gas purifying device 3 conveys purified natural gas into the natural gas compressor 12 for compression, the natural gas is liquefied and conveyed into a natural gas storage tank for storage, and the natural gas storage tank is connected with the gas turbine generator 23 and used for conveying the natural gas into the gas turbine generator 23.
Through the arrangement, the purpose of purifying and storing the extracted natural gas and simultaneously realizing the purpose of taking along with use while guaranteeing the combustion quality of the natural gas is realized.
As a preferred embodiment of the present invention, the lng tank 13 is connected to the air separation device 8, and cold energy generated during the gasification of natural gas in the lng tank 13 is used in the air separation device 8.
Preferably, the system further comprises an lng gasification cold energy utilization system, and the lng gasification cold energy utilization system is respectively connected with the lng storage tank 13 and the air separation device 8, and is used for conveying cold energy generated in the natural gas conveying process in the lng storage tank 13 to the air separation device 8.
Because the natural gas in the liquefied natural gas storage tank 13 is gasified to generate cold energy in the process of being conveyed to the gas turbine generator 23, the liquefied natural gas gasification cold energy utilization system is used for recovering the cold energy generated in the natural gas gasification process in the liquefied natural gas storage tank 13 and conveying the cold energy to the air separation device 8, and the air separation device 8 utilizes the cold energy to separate air and extract oxygen and nitrogen.
The lng gasification cold energy utilization system adopts a technology disclosed in the prior art, for example, a related technology disclosed in an air separation system and cold energy utilization method using lng cold energy of application number CN 115040887a, or a related technology disclosed in Process Integration of an Autothermal Reforming Hydrogen Production System with Cryogenic Air Separation and Carbon Dioxide Capture Using Liquefied Natural Gas Cold Energy published on Industrial & Engineering Chemistry Research at 5 months and 7 days of 2021.
Preferably, the battery pack 4 is connected to the air separation unit 8 for supplying electrical energy to the air separation unit 8.
As a preferred embodiment of the present invention, the gas turbine generator 23 is connected to the natural gas compressor 12, and uses mechanical energy generated by the gas turbine to partially use the mechanical energy in the natural gas compressor 12, so that the natural gas compressor 12 uses the partial mechanical energy to compress natural gas, and compresses the natural gas into a natural gas storage tank. Preferably, a gas turbine mechanical energy utilization system is also included, through which gas turbine generator 23 is connected to natural gas compressor 12, the gas turbine mechanical energy utilization system utilizing a portion of the mechanical energy generated by the gas turbine to natural gas compressor 12, causing natural gas compressor 12 to compress natural gas using this portion of the mechanical energy to compress the natural gas into a natural gas storage tank.
The mechanical energy utilization system of the gas turbine, which can use the mechanical energy generated by the gas turbine in the gas turbine generator 23 for the natural gas compressor 12, is a related technology in the prior art, for example, a complete system and method suitable for driving a compressor by the gas turbine disclosed in the patent publication No. CN 116241372A.
The invention is characterized by further comprising a sea water desalting device 14 and a fresh water storage tank 15, wherein the sea water desalting device 14 is connected with the fresh water storage tank 15 and is used for desalting sea water and delivering the desalted sea water into the fresh water storage tank 15, the fresh water storage tank 15 is used for storing fresh water and delivering the fresh water into the electrolytic hydrogen production device 5, and the electrolytic hydrogen production device 5 is connected with the fresh water storage tank 15. By arranging the sea water desalting device 14 and the fresh water storage tank 15, the sea resources can be fully utilized, and the service life of the electrolytic hydrogen production device 5 is prolonged by using fresh water to produce hydrogen.
As a preferred technical scheme of the invention, the device also comprises a carbon dioxide capturing device and a carbon dioxide sealing device 20, wherein the carbon dioxide capturing device comprises a water removing device 17, a carbon dioxide compressor 18 and a carbon dioxide storage tank 19, the water removing device 17 is connected with an exhaust port of a pipeline gas turbine and is used for carrying out water removing treatment on waste gas after natural gas combustion, a drain pipe is arranged on the water removing device 17 and is used for draining water, and the carbon dioxide compressor 18 is respectively connected with the water removing device 17 and the carbon dioxide storage tank 19 and compresses carbon dioxide subjected to water removing treatment into the carbon dioxide storage tank 19. The carbon dioxide sealing device 20 is connected with the carbon dioxide storage tank 19 and is used for performing ocean geological sealing on carbon dioxide, so that zero carbon emission of the whole system is realized.
The carbon dioxide sealing device 20 adopts the equipment/device disclosed in the prior art, for example, the technology disclosed in the related art in the patent of a marine sealing device for carbon dioxide after capturing of ship disclosed in publication number CN116788441a, and the technology disclosed in the patent of an integrated device for exploitation of combustible ice and sealing of carbon dioxide disclosed in publication number CN117027734 a.
As the preferable technical scheme of the invention, the ammonia storage device also comprises an ammonia compressor 21 and a liquid ammonia storage tank 22, wherein the ammonia compressor 21 is connected with the ammonia preparation device 11 and is used for compressing ammonia generated by the ammonia preparation device 11 into the liquid ammonia storage tank 22, so that the ammonia is liquefied and is convenient to convey.
The invention also discloses a using method of the system, which comprises the following steps:
s1, wind power generation is carried out through an offshore wind farm 1, and electric energy is stored in a storage battery pack 4; the natural gas hydrate exploitation unit is adopted to conduct natural gas exploitation, natural gas is compressed into the liquefied natural gas storage tank 13 through the natural gas compressor 12, the liquefied natural gas storage tank 13 conveys gaseous natural gas to the gas turbine generator 23, the gas turbine generator 23 generates electricity and stores electric energy in the storage battery 4, and carbon dioxide generated by the combustion of the natural gas in the gas turbine generator 23 is captured and stored through the carbon dioxide capturing device 16. The mechanical energy generated by the gas turbine generator 23 is transmitted to the natural gas compressor 12 by the gas turbine mechanical energy utilization system, and the natural gas compressor 12 compresses natural gas using the mechanical energy.
S2, cold energy generated in the gasification process of the liquefied natural gas in the liquefied natural gas storage tank 13 is conveyed to the air separation device 8 through the liquefied natural gas gasification cold energy utilization system, the storage battery pack 4 supplies power to the air separation device 8, the air separation device 8 utilizes the cold energy and the electric energy to separate nitrogen and oxygen in the air, oxygen and nitrogen are extracted, the oxygen separated by the air separation device 8 is conveyed to the second oxygen storage tank 9 to be stored, the nitrogen is conveyed to the nitrogen storage tank 10 to be stored, and the oxygen stored in the second oxygen storage tank 9 is conveyed to the gas turbine generator to enable the natural gas to be burnt in an oxygen-enriched mode.
S3, the storage battery pack 4 supplies power to the electrolytic hydrogen production device 5, the fresh water storage tank 15 supplies fresh water to the electrolytic hydrogen production device 5, the electrolytic hydrogen production device 5 carries out electrolysis on water, oxygen generated by electrolysis is conveyed to the first oxygen storage tank 6 for storage, and hydrogen generated by electrolysis is conveyed to the hydrogen storage tank 7 for storage; oxygen stored in the first oxygen storage tank 6 is conveyed into the gas turbine generator, so that natural gas is burnt in an oxygen-enriched mode.
S4, conveying hydrogen in the hydrogen storage tank 7 and nitrogen in the nitrogen storage tank 10 into the ammonia production device 11, synthesizing ammonia by the ammonia production device 11 through the hydrogen and the nitrogen, compressing the ammonia into the liquid ammonia storage tank 22 through the ammonia compressor 21, and transferring the liquid ammonia by conveying the liquid ammonia storage tank 22 to a quay of a liquid ammonia transport ship through a liquid ammonia transport ship and a quay transfer device due to the fact that the system is built on an offshore platform.
While the invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. Offshore application combustible ice and wind power complementary ammonia production system, characterized by comprising:
an offshore wind farm (1) for wind power generation and for transmitting electrical energy to a battery pack (4);
a natural gas hydrate production unit for producing natural gas hydrate and delivering the natural gas to a gas turbine generator (23);
a gas turbine generator (23) connected to the natural gas hydrate extraction unit for generating electricity by natural gas combustion and supplying electric energy to the storage battery (4);
a battery (4) for storing electrical energy;
an electrolytic hydrogen production device (5) connected with the storage battery (4) and performing an electrolytic water reaction by using electric energy to generate hydrogen and oxygen;
a first oxygen storage tank (6) connected to the electrolytic hydrogen production device (5) for storing oxygen generated by the electrolytic hydrogen production device (5); the first oxygen storage tank (6) is also connected with the gas turbine generator (23) and is used for conveying oxygen to the gas turbine generator (23);
a hydrogen storage tank (7) connected to the electrolytic hydrogen production device (5) for storing hydrogen gas generated by the electrolytic hydrogen production device (5); the hydrogen storage tank (7) is also connected with the ammonia production device (11) and is used for delivering hydrogen to the ammonia production device (11);
the air separation device (8) is connected with the storage battery pack (4), and utilizes electric energy provided by the storage battery pack (4) to separate nitrogen and oxygen in the air and extract the nitrogen and the oxygen in the air;
a second oxygen storage tank (9) connected to the air separation device (8) for storing oxygen extracted by the air separation device (8), the second oxygen storage tank (9) being connected to the sea gas turbine generator (23) for delivering oxygen to the gas turbine generator (23);
a nitrogen storage tank (10) connected to the air separation device (8) for storing nitrogen gas extracted by the air separation device (8), the nitrogen storage tank (10) being further connected to the ammonia production device (11) and delivering the nitrogen gas to the ammonia production device (11);
an ammonia production device (11) for producing ammonia gas.
2. The offshore application combustible ice and wind power complementary ammonia production system according to claim 1, wherein the natural gas hydrate production unit comprises a well drilling production device (2) and a natural gas purification device (3), the well drilling production device (2) is used for producing natural gas hydrate, and the natural gas purification device (3) is connected with the well drilling production device (2) and is used for removing impurity gas, water and partial liquid phase light hydrocarbon in raw natural gas.
3. The offshore application combustible ice and wind power complementary ammonia production system of claim 2, further comprising:
a natural gas compressor (12) connected to the natural gas purification device (3) and compressing natural gas into the liquefied natural gas storage tank (13);
a liquefied natural gas storage tank (13) for storing natural gas.
4. Offshore application combustible ice and wind power complementary ammonia production system according to claim 3, further comprising a liquefied natural gas gasification cold energy utilization system, wherein the liquefied natural gas gasification cold energy utilization system is respectively connected with the liquefied natural gas storage tank (13) and the air separation device (8) and is used for conveying cold energy generated in the natural gas conveying process in the liquefied natural gas storage tank (13) to the air separation device (8).
5. The offshore application combustible ice and wind power complementary ammonia production system of claim 4, further comprising a gas turbine mechanical energy utilization system connected to the gas turbine generator (23) and the natural gas compressor (12), respectively, wherein a portion of the mechanical energy generated by the gas turbine in the gas turbine generator is used by the natural gas compressor (12) to cause the natural gas compressor (12) to compress natural gas using the portion of the mechanical energy.
6. The offshore application combustible ice and wind power complementary ammonia production system of claim 3, further comprising:
the sea water desalting device (14) is connected with the fresh water storage tank (15) and is used for desalting sea water and conveying the desalted sea water into the fresh water storage tank (15);
and a fresh water storage tank (15) connected to the electrolytic hydrogen production device (5) for storing fresh water after the sea water desalination device (14) and for delivering the fresh water to the electrolytic hydrogen production device (5).
7. The offshore application combustible ice and wind power complementary ammonia production system of claim 3, further comprising:
carbon dioxide trapping device (16), it includes water trap (17), carbon dioxide compressor (18), carbon dioxide storage tank (19), water trap (17) are connected through pipeline gas turbine's gas vent for carry out the dehydration to the waste gas after the natural gas burning and handle, carbon dioxide compressor (18) are connected with water trap (17), carbon dioxide storage tank (19) respectively, are used for compressing and store carbon dioxide in carbon dioxide storage tank (19)
And a carbon dioxide sequestration device (20) connected to the carbon dioxide storage tank (19) for the geological sequestration of carbon dioxide in the ocean.
8. The offshore application combustible ice and wind power complementary ammonia production system of claim 3, further comprising:
an ammonia compressor (21) which is respectively connected with the ammonia production device (11) and the liquid ammonia storage tank (22) and is used for compressing the ammonia produced by the ammonia production device (11) into the liquid ammonia storage tank (22);
and a liquid ammonia storage tank (22) for storing liquid ammonia.
9. Offshore application combustible ice and wind power complementary ammonia production system according to claim 3, characterised in that the gas turbine generator (23) comprises a gas turbine, a generator, the gas turbine being connected to the generator.
10. The method for producing ammonia by using a complementary system for producing ammonia by using combustible ice and wind power at sea according to claim 5, comprising the following steps:
s1, wind power generation is carried out through an offshore wind farm (1), and electric energy is stored in a storage battery pack (4); natural gas exploitation is carried out through a natural gas hydrate exploitation unit, natural gas is compressed into a liquefied natural gas storage tank (13) by using a natural gas compressor (12), the liquefied natural gas storage tank (13) conveys gaseous natural gas to a gas turbine generator (23), and the gas turbine generator (23) generates electricity and stores electric energy in a storage battery pack (4);
s2, conveying cold energy generated in the gasification process of the liquefied natural gas in the liquefied natural gas storage tank (13) to the air separation device (8) through the liquefied natural gas gasification cold energy utilization system, separating nitrogen and oxygen in air by the air separation device (8) through cold energy and electric energy, conveying the oxygen separated by the air separation device (8) to the second oxygen storage tank (9) for storage, conveying the nitrogen to the nitrogen storage tank (10) for storage, and conveying the oxygen stored in the second oxygen storage tank (9) to the gas turbine generator for oxygen-enriched combustion of the natural gas;
s3, the storage battery pack (4) supplies power to the electrolytic hydrogen production device (5), the electrolytic hydrogen production device (5) performs electrolysis on water, oxygen generated by electrolysis is conveyed to a first oxygen storage tank (6) for storage, and hydrogen generated by electrolysis is conveyed to a hydrogen storage tank (7) for storage; oxygen stored in the first oxygen storage tank 6 is conveyed into the gas turbine generator, so that natural gas is burnt in an oxygen-enriched mode;
s4, conveying the hydrogen in the hydrogen storage tank (7) and the nitrogen in the nitrogen storage tank (10) into the ammonia production device (11), and synthesizing ammonia by the ammonia production device (11) through the hydrogen and the nitrogen.
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