CN114992885A - Green ammonia production system and method based on photo-thermal technology - Google Patents
Green ammonia production system and method based on photo-thermal technology Download PDFInfo
- Publication number
- CN114992885A CN114992885A CN202210528917.3A CN202210528917A CN114992885A CN 114992885 A CN114992885 A CN 114992885A CN 202210528917 A CN202210528917 A CN 202210528917A CN 114992885 A CN114992885 A CN 114992885A
- Authority
- CN
- China
- Prior art keywords
- ammonia
- heat
- salt
- photo
- outlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 259
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 127
- 238000005516 engineering process Methods 0.000 title claims abstract description 47
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 33
- 150000003839 salts Chemical class 0.000 claims abstract description 109
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 72
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 48
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000001301 oxygen Substances 0.000 claims abstract description 40
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 40
- 238000000926 separation method Methods 0.000 claims abstract description 34
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 29
- 239000001257 hydrogen Substances 0.000 claims abstract description 28
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 28
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 25
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000002918 waste heat Substances 0.000 claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 239000007789 gas Substances 0.000 claims description 30
- 230000015572 biosynthetic process Effects 0.000 claims description 28
- 238000003786 synthesis reaction Methods 0.000 claims description 28
- 230000008569 process Effects 0.000 claims description 23
- 230000008676 import Effects 0.000 claims description 12
- 239000006096 absorbing agent Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000012141 concentrate Substances 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 11
- 239000006227 byproduct Substances 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000004146 energy storage Methods 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 22
- 229910002092 carbon dioxide Inorganic materials 0.000 description 11
- 239000001569 carbon dioxide Substances 0.000 description 11
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 230000002194 synthesizing effect Effects 0.000 description 5
- 239000003245 coal Substances 0.000 description 4
- 239000002803 fossil fuel Substances 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000009620 Haber process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S60/00—Arrangements for storing heat collected by solar heat collectors
- F24S60/30—Arrangements for storing heat collected by solar heat collectors storing heat in liquids
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/04—Preparation of ammonia by synthesis in the gas phase
- C01C1/0405—Preparation of ammonia by synthesis in the gas phase from N2 and H2 in presence of a catalyst
- C01C1/0447—Apparatus other than synthesis reactors
- C01C1/0452—Heat exchangers
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/006—Methods of steam generation characterised by form of heating method using solar heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/028—Steam generation using heat accumulators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S20/00—Solar heat collectors specially adapted for particular uses or environments
- F24S20/30—Solar heat collectors for heating objects, e.g. solar cookers or solar furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
- F25J3/04563—Integration with a nitrogen consuming unit, e.g. for purging, inerting, cooling or heating
-
- 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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/133—Renewable energy sources, e.g. sunlight
Abstract
The invention discloses a green ammonia production system and method based on a photo-thermal technology. The system comprises a photo-thermal device, a hot salt tank, a steam generator, a steam turbine, a generator, an air separation plant, an electrolytic water device, an oxygen storage tank, a compressor, a heat exchanger, a synthetic ammonia device, an ammonia storage tank, a transportation facility, an energy saver, a cold salt tank and the like. The electric energy used in the system is provided by the photo-thermal power station, fossil energy input is not needed, and carbon emission in the ammonia production process is zero. The system takes high-temperature molten salt as a heat source to heat hydrogen and nitrogen, so as to provide high-temperature conditions for reaction. The waste heat of the synthetic ammonia reaction is utilized to heat the feed water, so that the waste heat utilization is realized. Oxygen generated by the air separation device and the water electrolysis device can be recovered as a byproduct, and economic benefits are improved. The invention realizes green ammonia production and renewable energy consumption based on the photo-thermal technology, meets the environmental protection requirement and the energy storage requirement, obtains oxygen with a certain added value, and has remarkable social benefit and economic benefit.
Description
Technical Field
The invention belongs to the technical field of renewable energy sources and synthetic ammonia, and particularly relates to a green ammonia production system and method based on a photo-thermal technology.
Background
Ammonia is one of the chemical products with the largest yield in the world, and the production method is mainly to react hydrogen and nitrogen at high temperature and high pressure through a Haber-Bosch process to generate ammonia. The high temperature condition required by the reaction is mainly realized by burning fossil fuel, and in addition, most of hydrogen used as reactant is also prepared from the fossil fuel, so the carbon emission of the traditional ammonia synthesis process is very high. In fact, the energy consumed by the synthesis ammonia accounts for 3% of the total world energy consumption, and the carbon dioxide emission accounts for 1.8% of the global artificial carbon emission. With the vision of "carbon neutralization", synthetic ammonia processes have great carbon abatement pressures. Therefore, a new ammonia synthesis technology is needed to solve the problem of excessive carbon emission in the existing ammonia synthesis technology, and finally, ammonia production with zero carbon emission is realized.
The photo-thermal power generation is a technology for collecting solar heat energy by utilizing a large-scale mirror surface to heat molten salt, transferring the heat of the high-temperature molten salt to steam, driving a steam turbine to do work and finally generating power, and is a typical renewable energy utilization technology. Carbon emission is not generated in the process of obtaining high-temperature molten salt and electric power by utilizing the photo-thermal technology, so that if the photo-thermal technology is combined with the ammonia synthesis technology, a green ammonia production process without carbon dioxide emission is expected to be developed. Currently, some researchers have conducted research on the process of synthesizing ammonia by using renewable energy. For example, in the chinese patent "a supercritical carbon dioxide boiler coupled with ammonia fuel energy storage and its working method" (publication No. CN113324235A), surplus renewable energy power in the power grid is used to produce hydrogen by electrolyzing water, and then reacts with oxygen to synthesize ammonia, and the ammonia is sent to the supercritical carbon dioxide boiler to be co-fired with coal powder; in the Chinese patent 'a renewable energy power plant electrolytic hydrogen production ammonia synthesis system and peak-shaving frequency-modulation electrochemical plant' (No. CN210123896U), hydrogen and oxygen are produced by electrolysis using peak-shaving surplus electricity of the renewable energy power plant as a power supply, and ammonia is synthesized by the reaction of the hydrogen and the nitrogen; in a Chinese patent 'fixed focus disc type light-gathering heat-storage molten salt system for ammonia production' (No. CN215057943U), a fixed focus disc type light-gathering heat-storage molten salt system is disclosed, which optimizes photo-thermal facilities and uses the electric power of a photo-thermal power station for compressing hydrogen and nitrogen required by an ammonia production process. However, the above research of coupling renewable energy source with synthetic ammonia is optimized only for part of the flow in the synthetic ammonia process, and the following disadvantages still exist: (1) only realizes the low-carbon transformation of part links in the process of synthesizing ammonia, and does not realize the ammonia production with zero carbon emission in the whole process; (2) for the photo-thermal technology, no specific strategy for reasonably utilizing the heat of the high-temperature molten salt is provided; (3) a large amount of waste heat is generated in the process of synthesizing ammonia by the Haber-Bosch process, and the waste heat is not reasonably utilized by the existing research, so that the energy waste is caused.
Disclosure of Invention
The invention aims to provide a system and a method for producing green ammonia based on a photo-thermal technology, which couple the photo-thermal technology with an ammonia synthesis process and enable the production of green ammonia with zero carbon emission to be possible. The method creatively provides that the heat of the high-temperature molten salt is utilized to heat the nitrogen and the hydrogen so as to meet the high temperature required in the synthetic ammonia reaction process. In the photo-thermal power generation process, the waste heat of the synthetic ammonia reaction is firstly utilized for preheating before the feed water enters the steam generator, so that the system efficiency is improved, and the bi-directional coupling of the photo-thermal technology and the synthetic ammonia process is really realized. The power and the heat energy used in the ammonia production process are both provided by a photo-thermal technology, and the zero-carbon emission of the whole process is realized. Oxygen worthy of the air separation device and the water electrolysis device can be collected and sold as a byproduct, and the economic benefit of the system is provided.
In order to achieve the purpose, the invention adopts the following technical scheme:
a green ammonia production system based on a photo-thermal technology comprises photo-thermal equipment, a hot salt tank, a steam generator, a steam turbine, a generator, an air separation device, an electrolytic water device, an oxygen storage tank, a compressor, a heat exchanger, a synthetic ammonia device, an ammonia storage tank, an economizer, a cold salt tank, a mixed gas pipeline and a water supply pipeline;
an oxygen outlet of the air separation device and an oxygen outlet of the water electrolysis device are connected to an inlet of an oxygen storage tank, a nitrogen outlet of the air separation device and a hydrogen outlet of the water electrolysis device are connected to an inlet of a compressor, an outlet of the compressor is connected to a mixed gas inlet of a heat exchanger through a mixed gas pipeline, a mixed gas outlet of the heat exchanger is connected to a mixed gas inlet of a synthetic ammonia device, an ammonia outlet of the synthetic ammonia device is connected to an inlet of an ammonia storage tank, a waste heat outlet of the synthetic ammonia device is connected to a waste heat outlet of an energy saver, a water supply inlet is formed in the energy saver, a hot water outlet of the energy saver is connected with a hot water inlet of a steam generator through a water supply pipeline, a steam outlet of the steam generator is connected to a steam inlet of a steam turbine, the steam turbine is coaxially connected with a generator, and the generator is used for supplying power to the air separation device, the water electrolysis device and the compressor;
the high temperature fused salt export of hot salt jar divide into two the tunnel, is connected to steam generator's the import of high temperature fused salt and the import of the high temperature fused salt of heat exchanger respectively, and the low temperature fused salt export of steam generator's the export of the low temperature fused salt of heat exchanger is imported to the low temperature fused salt of cold salt jar, and the low temperature fused salt exit linkage of cold salt jar is imported to the import of light and heat equipment, and the exit linkage of light and heat equipment is imported to the high temperature fused salt of hot salt jar.
A further development of the invention is that it also comprises a transport facility, the outlet of the ammonia storage tank being connected to the inlet of the transport facility.
The invention is further improved in that the photothermal device comprises a heliostat, a solar tower and a heat absorber, the heliostat in the photothermal device is used for concentrating heat in the heat absorber on the top of the solar tower, and the low-temperature molten salt in the cold salt tank is sent to the hot salt tank after being heated.
The invention is further improved in that the temperature of the high-temperature molten salt in the hot salt tank is above 560 ℃.
The further improvement of the invention is that the temperature of the low-temperature molten salt is 285-300 ℃ when the high-temperature molten salt enters the cold salt tank after being released by the steam generator or the heat exchanger.
The invention is further improved in that oxygen generated in the air separation plant and the water electrolysis plant is collected by an oxygen storage tank.
The further improvement of the invention is that the working temperature in the ammonia synthesis device is 400-500 ℃, and the high temperature condition is realized by heating the mixed gas of nitrogen and hydrogen in a heat exchanger through high-temperature molten salt.
The invention is further improved in that the waste heat generated in the operation process of the synthetic ammonia device is utilized to heat the feed water in the energy saver, and the heated feed water is sent to the steam generator through the feed water pipeline.
A green ammonia production method based on a photothermal technology is characterized in that the method is based on the green ammonia production system based on the photothermal technology, and comprises the following steps:
1) the heliostat in the photo-thermal equipment collects heat in a heat absorber at the top of the solar tower, and the low-temperature molten salt in the cold salt tank is heated and then is sent to the hot salt tank;
2) the feed water preheated by the economizer is sent into a steam generator through a feed water pipeline, the heat of the high-temperature molten salt is continuously absorbed to generate steam, a steam turbine is pushed to do work, electric energy is generated through a generator, and the molten salt after heat exchange enters a cold salt tank;
3) the air separation device is driven by the electric energy generated by the generator to separate the air into nitrogen and oxygen, the water electrolysis device is driven by the electric energy generated by the generator to generate hydrogen and oxygen, and the oxygen generated by the air separation device and the water electrolysis device is collected in the oxygen storage tank;
4) the nitrogen generated by the air separation device and the hydrogen generated by the water electrolysis device are mixed and then are boosted by the compressor, and the electric energy consumed in the running process of the compressor is provided by the generator;
5) the compressed nitrogen and hydrogen are sent to a heat exchanger through a mixed gas pipeline, the mixed gas absorbs the heat of the high-temperature molten salt to heat, and the molten salt after heat exchange enters a cold salt tank;
6) feeding the heated mixed gas into an ammonia synthesis device for reaction, and collecting the generated ammonia gas into an ammonia storage tank;
7) the waste heat generated in the operation process of the synthetic ammonia device is utilized in the energy saver to heat the feed water;
8) repeating the steps 1) to 7), and realizing green ammonia production without carbon emission by using a photo-thermal technology.
Compared with the prior art, the invention has at least the following beneficial technical effects:
the green ammonia production system based on the photo-thermal technology integrates the photo-thermal technology and the ammonia synthesis technology, and is convenient for large-scale production of ammonia by utilizing photo-thermal resources under the condition of no carbon emission. A heat exchanger is arranged to transfer the heat of the high-temperature molten salt to the mixed gas of nitrogen and hydrogen so as to meet the high-temperature condition required in the synthetic ammonia reaction and replace the traditional method for obtaining high temperature by burning fossil fuel. The photo-thermal power generation is used for an air separation device, a water electrolysis device and a compressor, so that all power used in the whole ammonia production process is from renewable energy sources, and the emission of carbon dioxide is zero. The waste heat of the synthetic ammonia reaction is used as a heat source to heat the water supply, so that the system efficiency is improved, and the bidirectional coupling of the photo-thermal technology and the synthetic ammonia process is realized.
Compared with the traditional ammonia synthesis method, the method for producing green ammonia based on the photo-thermal technology has the advantages that hydrogen and nitrogen are respectively from water and air, the used electric energy and heat energy are provided by renewable energy sources, fossil energy does not need to be consumed, and the environmental protection benefit is obvious. Meanwhile, a byproduct of oxygen can be obtained, and the economic benefit of the system is improved. From the perspective of energy conversion, the method converts solar energy into chemical energy of ammonia, is convenient for storage and transportation, and meets the requirements of renewable energy consumption and energy storage.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Description of the reference numerals:
the system comprises a photo-thermal device 1, a hot salt tank 2, a steam generator 3, a steam turbine 4, a generator 5, an air separation device 6, an electrolytic water device 7, an oxygen storage tank 8, a compressor 9, a heat exchanger 10, an ammonia synthesis device 11, an ammonia storage tank 12, a transportation facility 13, an energy saver 14, a cold salt tank 15, a mixed gas pipeline 16 and a water supply pipeline 17.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in FIG. 1, the green ammonia production system based on photothermal technology provided by the invention comprises a photothermal device 1, a hot salt tank 2, a steam generator 3, a steam turbine 4, a generator 5, an air separation unit 6, an electrolytic water unit 7, an oxygen storage tank 8, a compressor 9, a heat exchanger 10, an ammonia synthesis unit 11, an ammonia storage tank 12, a transportation facility 13, an economizer 14, a cold salt tank 15, a mixed gas pipeline 16 and a water supply pipeline 17.
An oxygen outlet of the air separation device 6 and an oxygen outlet of the water electrolysis device 7 are connected to an inlet of an oxygen storage tank 8, a nitrogen outlet of the air separation device 6 and a hydrogen outlet of the water electrolysis device 7 are connected to an inlet of a compressor 9, an outlet of the compressor 9 is connected to a mixed gas inlet of a heat exchanger 10 through a mixed gas pipeline 16, a mixed gas outlet of the heat exchanger 10 is connected to a mixed gas inlet of an ammonia synthesis device 11, an ammonia gas outlet of the ammonia synthesis device 11 is connected to an inlet of an ammonia storage tank 12, a waste heat outlet of the ammonia synthesis device 11 is connected to a waste heat outlet of an economizer 14, a water supply inlet is arranged on the economizer 14, a hot water outlet of the economizer 14 is connected with a hot water inlet of a steam generator 3 through a water supply pipeline 17, a steam outlet of the steam generator 3 is connected to a steam inlet of a steam turbine 4, the steam turbine 4 is coaxially connected with a generator 5, and the generator 5 is used for supplying power for the air separation device 6, water separation device 7, the air separation device 6, the water electrolysis device 7 and the water electrolysis device 5, The water electrolysis device 7 and the compressor 9 supply power; the high temperature fused salt export of hot salt jar 2 is divided into two the tunnel, is connected to the import of the high temperature fused salt of steam generator 3 and the import of the high temperature fused salt of heat exchanger 10 respectively, and the export of the low temperature fused salt of steam generator 3 and the import of the low temperature fused salt exit linkage of heat exchanger 10 to cold salt jar 15, and the import of the low temperature fused salt exit linkage of cold salt jar 15 to light and heat equipment 1, the export linkage of light and heat equipment 1 to the import of the high temperature fused salt of hot salt jar 2.
Further, the photothermal device 1 includes a heliostat, a solar tower, and a heat absorber, the heliostat in the photothermal device 1 is used to concentrate heat in the heat absorber on the top of the solar tower, and the low-temperature molten salt in the cold salt tank 15 is sent to the hot salt tank 2 after being heated.
Further, the temperature of the high-temperature molten salt in the hot salt tank 2 is above 560 ℃.
Further, the temperature of the low-temperature molten salt is 285-300 ℃ when the high-temperature molten salt enters the cold salt tank 15 after heat release of the steam generator 3 or the heat exchanger 10.
Furthermore, the electric energy consumed in the working processes of the air separation device 6, the water electrolysis device 7 and the compressor 9 is provided by the generator 5.
Further, oxygen generated in the air separation plant 6 and the water electrolysis plant 7 is collected by an oxygen storage tank 8.
Further, the working temperature in the ammonia synthesis device 11 is 400 ℃ to 500 ℃, and the high temperature condition is realized by heating the mixed gas of nitrogen and hydrogen in the heat exchanger 10 through high-temperature molten salt.
Further, the feedwater is heated in the economizer 14 by the waste heat generated during the operation of the ammonia synthesis unit 11, and the heated feedwater is sent to the steam generator 3 through the feedwater pipe 17.
Further, the ammonia gas generated in the ammonia synthesis unit 11 is collected by an ammonia storage tank 12 and can be transported to various locations by a transportation facility 13.
The invention provides a green ammonia production method based on a photo-thermal technology, which comprises the following steps:
the heliostat in the photo-thermal equipment 1 collects heat in a heat absorber at the top of the solar tower, and the low-temperature molten salt in the cold salt tank 15 is heated and then is sent to the hot salt tank 2;
the feed water preheated by the economizer 14 is sent into the steam generator 3 through a feed water pipeline 17, the heat of the high-temperature molten salt is continuously absorbed to generate steam, the steam turbine 4 is pushed to do work, the generator 5 generates electric energy, and the molten salt after heat exchange enters the cold salt tank 15;
the air separation device 6 is driven by the electric energy generated by the generator 5 to separate the air into nitrogen and oxygen, the water electrolysis device 7 is driven by the electric energy generated by the generator 5 to generate hydrogen and oxygen, and the oxygen generated by the air separation device 6 and the water electrolysis device 7 is collected in the oxygen storage tank 8;
the nitrogen generated by the air separation device 6 and the hydrogen generated by the water electrolysis device 7 are mixed and then are boosted by the compressor 9, and the electric energy consumed in the running process of the compressor 9 is also provided by the generator 5;
the compressed nitrogen and hydrogen are sent to a heat exchanger 10 through a mixed gas pipeline 16, the mixed gas absorbs the heat of the high-temperature molten salt to heat, and the molten salt after heat exchange enters a cold salt tank 15;
the mixed gas after the temperature rise is sent into an ammonia synthesis device 11 for reaction, and the generated ammonia gas is collected into an ammonia storage tank 12 and can be sent to various places through a transportation facility 13;
the residual heat generated in the operation process of the ammonia synthesis device 11 is utilized in the economizer 14 to heat the feed water;
the steps are repeated, and the green ammonia production without carbon emission can be realized by utilizing a photo-thermal technology.
Examples
The emission amount of carbon dioxide in the petrochemical and chemical industries of China is about 11 hundred million tons, which accounts for about 10 percent of the total national emission amount, while the emission amount of carbon dioxide in the synthetic ammonia industry accounts for 19.9 percent of the total petrochemical and chemical industries, which is about 2.19 hundred million tons, which is a high-carbon emission industry, and has huge carbon emission reduction pressure. 1 ton of ammonia is produced, the carbon dioxide emission of the coal head route is about 4.2 tons, and the carbon dioxide emission of the natural gas head route is about 2.04 tons. Taking the scale of annual production of 30 ten thousand tons of synthetic ammonia as an example, if the green ammonia production system and the method based on the photothermal technology provided by the invention are adopted, the carbon emission can be reduced by 126 ten thousand tons/year compared with the traditional coal head route for synthesizing ammonia, and the carbon emission can be reduced by 61.2 ten thousand tons/year compared with the traditional natural gas head route for synthesizing ammonia. The international monetary fund organization predicts that carbon dioxide should be priced around $ 75 per ton to achieve a temperature control target of 2030 c at 2 c. Accordingly, it is estimated that if the system and method for producing green ammonia based on photothermal technology provided by the invention are adopted, the carbon transaction expenditure can be reduced by 9450 ten thousand dollars/year compared with the traditional coal head route synthetic ammonia, and the carbon transaction expenditure can be reduced by 4590 ten thousand dollars/year compared with the traditional natural gas head route synthetic ammonia. Therefore, the invention not only has remarkable social and environmental benefits, but also has good economic benefits.
In summary, the system and the method for producing green ammonia based on the photo-thermal technology, provided by the invention, couple the photo-thermal technology and the ammonia synthesis technology in a two-way manner, so that the whole-flow zero-carbon emission of ammonia production is realized. Renewable power generated by the photo-thermal technology is used for driving an air separation device and an electrolytic water device respectively to generate nitrogen and hydrogen, electric energy of equipment such as a compressor and the like in the system is also provided by photo-thermal power generation, and high-temperature molten salt can be used as a heat source to heat mixed gas of the hydrogen and the nitrogen, so that the temperature condition required by the synthetic ammonia reaction is met, and fossil fuel can be avoided being used in the generation process of ammonia. Zero carbon dioxide emission is realized, and green ammonia production is realized. The waste heat of the synthetic ammonia process is reasonably utilized to heat the feed water, and the efficiency of the system is further improved. Oxygen generated by the air separation device and the water electrolysis device is collected by the oxygen storage tank and can be sold as a byproduct, so that the economic benefit of the system is increased. The invention realizes the green ammonia production without carbon emission based on the photo-thermal technology, is beneficial to the achievement of the aim of 'carbon neutralization' in the global synthetic ammonia industry, also meets the requirements of renewable energy consumption and energy storage, and creates considerable social and economic benefits.
It should be understood that this example is only for illustrating the present invention and is not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications may be made by those skilled in the art after reading the teachings of the present invention, however, these equivalents also fall within the scope of the appended claims of the present application.
Claims (9)
1. A green ammonia production system based on a photo-thermal technology is characterized by comprising photo-thermal equipment (1), a hot salt tank (2), a steam generator (3), a steam turbine (4), a generator (5), an air separation device (6), an electrolytic water device (7), an oxygen storage tank (8), a compressor (9), a heat exchanger (10), a synthetic ammonia device (11), an ammonia storage tank (12), an economizer (14), a cold salt tank (15), a mixed gas pipeline (16) and a water supply pipeline (17);
an oxygen outlet of the air separation device (6) and an oxygen outlet of the water electrolysis device (7) are connected to an inlet of an oxygen storage tank (8), a nitrogen outlet of the air separation device (6) and a hydrogen outlet of the water electrolysis device (7) are connected to an inlet of a compressor (9), an outlet of the compressor (9) is connected to a mixed gas inlet of a heat exchanger (10) through a mixed gas pipeline (16), a mixed gas outlet of the heat exchanger (10) is connected to a mixed gas inlet of an ammonia synthesis device (11), an ammonia outlet of the ammonia synthesis device (11) is connected to an inlet of an ammonia storage tank (12), a waste heat outlet of the ammonia synthesis device (11) is connected to a waste heat outlet of an economizer (14), a water supply inlet is arranged on the economizer (14), a hot water outlet of the economizer (14) is connected to a hot water inlet of a steam generator (3) through a water supply pipeline (17), a steam outlet of the steam generator (3) is connected to a steam inlet of a steam turbine (4), the steam turbine (4) is coaxially connected with the generator (5), and the generator (5) is used for supplying power to the air separation device (6), the water electrolysis device (7) and the compressor (9);
the high temperature fused salt export of hot salt jar (2) is divided into two the tunnel, is connected to the high temperature fused salt import of steam generator (3) and the high temperature fused salt import of heat exchanger (10) respectively, and the low temperature fused salt export of steam generator (3) and heat exchanger (10) is connected to the low temperature fused salt import of cold salt jar (15), and the low temperature fused salt export of cold salt jar (15) is connected to the import of light and heat equipment (1), and the exit linkage of light and heat equipment (1) is imported to the high temperature fused salt of hot salt jar (2).
2. A green ammonia production system based on photothermal technology according to claim 1, further comprising a transportation facility (13), wherein the outlet of the ammonia storage tank (12) is connected to the inlet of the transportation facility (13).
3. A photothermal technology based green ammonia production system according to claim 1, wherein the photothermal device (1) comprises heliostats, solar tower and heat absorber, the heliostats in the photothermal device (1) are used to concentrate heat in the heat absorber on top of the solar tower, and the low temperature molten salt in the cold salt tank (15) is sent to the hot salt tank (2) after heating.
4. A green ammonia production system based on photothermal technology according to claim 1, wherein the temperature of the high temperature molten salt in the hot salt tank (2) is above 560 ℃.
5. A green ammonia production system based on photothermal technology according to claim 1, wherein the temperature of the molten salt at low temperature when the molten salt enters the cold salt tank (15) after the heat of the molten salt at high temperature is released by the steam generator (3) or the heat exchanger (10) is 285-300 ℃.
6. A green ammonia production system based on photothermal technology according to claim 1, wherein oxygen generated in the air separation unit (6) and the water electrolysis unit (7) is collected by the oxygen storage tank (8).
7. The green ammonia production system based on photothermal technology according to claim 1, wherein the working temperature in the ammonia synthesis device (11) is 400-500 ℃, and the high temperature condition is realized by heating the nitrogen and hydrogen mixed gas in the heat exchanger (10) through high-temperature molten salt.
8. A green ammonia production system based on photothermal technology according to claim 1, wherein the feed water is heated in the economizer (14) by the waste heat generated during the operation of the ammonia synthesis unit (11), and the heated feed water is sent to the steam generator (3) through the feed water pipe (17).
9. A method for producing green ammonia based on photothermal technology, which is based on the system for producing green ammonia based on photothermal technology as claimed in any one of claims 1 to 8, comprising the steps of:
1) the heliostat in the photo-thermal equipment (1) collects heat in a heat absorber at the top of the solar tower, and the low-temperature molten salt in the cold salt tank (15) is heated and then sent to the hot salt tank (2);
2) the feed water preheated by the economizer (14) is sent into the steam generator (3) through a feed water pipeline (17), the heat of the high-temperature molten salt is continuously absorbed to generate steam, the steam turbine (4) is pushed to do work, the electric energy is generated through the generator (5), and the molten salt after heat exchange enters the cold salt tank (15);
3) the air separation device (6) is driven by the electric energy generated by the generator (5) to separate the air into nitrogen and oxygen, the water electrolysis device (7) is driven by the electric energy generated by the generator (5) to generate hydrogen and oxygen, and the oxygen generated by the air separation device (6) and the water electrolysis device (7) is collected in the oxygen storage tank (8);
4) the nitrogen generated by the air separation device (6) is mixed with the hydrogen generated by the water electrolysis device (7) and then is boosted by the compressor (9), and the electric energy consumed in the running process of the compressor (9) is provided by the generator (5);
5) the compressed nitrogen and hydrogen are sent to a heat exchanger (10) through a mixed gas pipeline (16), the mixed gas absorbs the heat of the high-temperature molten salt to raise the temperature, and the molten salt after heat exchange enters a cold salt tank (15);
6) feeding the heated mixed gas into an ammonia synthesis device (11) for reaction, and collecting the generated ammonia gas into an ammonia storage tank (12);
7) the residual heat generated in the operation process of the ammonia synthesis device (11) is utilized in the energy saver (14) to heat the feed water;
8) repeating the steps 1) to 7), and realizing green ammonia production without carbon emission by using a photo-thermal technology.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210528917.3A CN114992885A (en) | 2022-05-16 | 2022-05-16 | Green ammonia production system and method based on photo-thermal technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210528917.3A CN114992885A (en) | 2022-05-16 | 2022-05-16 | Green ammonia production system and method based on photo-thermal technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114992885A true CN114992885A (en) | 2022-09-02 |
Family
ID=83028038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210528917.3A Pending CN114992885A (en) | 2022-05-16 | 2022-05-16 | Green ammonia production system and method based on photo-thermal technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114992885A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102428029A (en) * | 2009-05-05 | 2012-04-25 | 中村德彦 | Combined plant |
| CN105697250A (en) * | 2016-03-16 | 2016-06-22 | 绍兴文理学院 | Tower type solar synthetic ammonia system |
| CN106977369A (en) * | 2016-12-15 | 2017-07-25 | 华青松 | It is a kind of to comprehensively utilize the device and method that electric energy combines methanol processed and ammonia |
| CN111378980A (en) * | 2020-04-27 | 2020-07-07 | 中国华能集团清洁能源技术研究院有限公司 | Energy storage system and method for coproducing hydrogen and urea |
| CN113184806A (en) * | 2021-05-28 | 2021-07-30 | 浙江工业大学 | Solar ammonia decomposition hydrogen production system and process method |
-
2022
- 2022-05-16 CN CN202210528917.3A patent/CN114992885A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102428029A (en) * | 2009-05-05 | 2012-04-25 | 中村德彦 | Combined plant |
| CN105697250A (en) * | 2016-03-16 | 2016-06-22 | 绍兴文理学院 | Tower type solar synthetic ammonia system |
| CN106977369A (en) * | 2016-12-15 | 2017-07-25 | 华青松 | It is a kind of to comprehensively utilize the device and method that electric energy combines methanol processed and ammonia |
| CN111378980A (en) * | 2020-04-27 | 2020-07-07 | 中国华能集团清洁能源技术研究院有限公司 | Energy storage system and method for coproducing hydrogen and urea |
| CN113184806A (en) * | 2021-05-28 | 2021-07-30 | 浙江工业大学 | Solar ammonia decomposition hydrogen production system and process method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102660340B (en) | Process and equipment for converting carbon dioxide in flue gas into natural gas by using dump power energy | |
| CN105508051A (en) | High-temperature gas-cooled reactor helium and indirect cyclic hydrogen production coupled power generation system and method | |
| CN113322475B (en) | High-temperature solid oxide water electrolysis hydrogen production system and process coupling solar energy amino-thermal chemical energy storage and kalina circulation | |
| CN113503192B (en) | High-efficiency nuclear energy comprehensive utilization system capable of realizing flexible peak regulation of nuclear power station | |
| CN113005475B (en) | System and process for solar high-temperature water electrolysis coupling hydrogen production based on amino thermochemical energy storage | |
| CN202538625U (en) | Device for converting carbon dioxide in smoke into natural gas by dump energy | |
| CN108442982B (en) | Solar integrated coal-based methanol synthesis and power generation co-production system | |
| CN114992885A (en) | Green ammonia production system and method based on photo-thermal technology | |
| CN116317175A (en) | Solar-driven RSOC distributed poly-generation system and co-generation method thereof | |
| CN116180103A (en) | System for synthesizing green ammonia based on liquid air energy storage and high-temperature electrolysis | |
| WO2022242598A1 (en) | Apparatus and method for preparing hydrogen-containing product from natural gas on basis of new energy consumption | |
| CN115206570A (en) | Nuclear energy electricity water hydrogen co-production system and method thereof | |
| CN114353365A (en) | Solar-driven distributed energy system | |
| CN212357095U (en) | Renewable energy methanol synthesis system of thermal power plant | |
| CN114990583A (en) | Solar hydrogen production system based on magnesium-chlorine thermochemical cycle | |
| CN114853030A (en) | Solar ammonia production system and method | |
| CN113091334A (en) | Molten salt tower type solar ammonia decomposition hydrogen production system and process thereof | |
| CN219934746U (en) | Calcium hydroxide thermochemical energy storage system | |
| CN219792511U (en) | Green ammonia synthesis system | |
| CN106160242B (en) | A kind of system and technique of storage and release electric energy | |
| CN220579415U (en) | Electrolytic water hydrogen production coupling ammonia synthesis system | |
| CN214380121U (en) | Renewable energy power conversion and utilization system | |
| CN211111887U (en) | Thermal power plant pyrolysis of coal gas hydrogen manufacturing system | |
| CN117052619B (en) | LNG cold energy and photo-thermal hot water low-temperature heat energy combined power generation system and method | |
| CN217362588U (en) | Alcohol-coal renewable combustion circulation system driven by new energy |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220902 |