CN109339891B - Closed energy conversion remote transmission and carbon fixation system and method using magnesium as carrier - Google Patents
Closed energy conversion remote transmission and carbon fixation system and method using magnesium as carrier Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
- C01B3/06—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of inorganic compounds containing electro-positively bound hydrogen, e.g. water, acids, bases, ammonia, with inorganic reducing agents
- C01B3/08—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of inorganic compounds containing electro-positively bound hydrogen, e.g. water, acids, bases, ammonia, with inorganic reducing agents with metals
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/24—Magnesium carbonates
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
- C25C3/04—Electrolytic production, recovery or refining of metals by electrolysis of melts of magnesium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
- F01K25/103—Carbon dioxide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/32—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/133—Renewable energy sources, e.g. sunlight
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
Abstract
The invention provides a closed energy conversion remote transmission and carbon fixation system taking magnesium as a carrier, which comprises a magnesium electrolysis subsystem, a magnesium and water reaction power generation and hydrogen production subsystem and a carbon fixation subsystem which utilize renewable energy power. The invention also provides a closed energy conversion remote transmission and carbon fixation method taking magnesium as a carrier, redundant power of the renewable energy power plant is provided for an electrolytic magnesium plant, and magnesium produced by the electrolytic magnesium plant is transported to a use place through a long-distance transportation link. Magnesium reacts with water in a reactor to generate hydrogen and magnesium oxide, and the reaction heat is input into supercritical carbon dioxide for recycling to generate electricity. Magnesium reacts with water to generate magnesium oxide to the magnesium oxide carbon fixing device, and carbonation reaction heat in the magnesium oxide carbon fixing device is transferred to carbon dioxide for recycling to generate electricity. The invention can consume a large amount of renewable energy sources, realize large-scale long-distance transmission of energy, prepare high-quality hydrogen, fix carbon dioxide and provide heat for the supercritical carbon dioxide circulating generator set.
Description
Technical Field
The invention relates to a closed energy conversion remote transmission and carbon fixation system and method taking magnesium as a carrier, and belongs to the technical field of new energy.
Background
The current society is undergoing an unprecedented energy revolution, on one hand, renewable energy sources replace conventional fossil energy sources to comprehensively enter the energy utilization fields in industrial production and daily life, on the other hand, carriers of the energy sources become more diversified, and electricity, heat and hydrogen, and energy-containing materials are all energy carriers. Energy technology is very different, but also brings about inconsistencies and conflicts which cannot be ignored. The western region and the northwest region of China are renewable energy enrichment regions such as solar energy, wind energy, water energy and the like, but the new energy cannot be absorbed by a power grid, and the conditions of wind discarding, light discarding and water discarding are quite prominent, so that serious resource waste is caused. The eastern area has developed industry and dense population, but renewable energy sources are few, and the large-scale use of fossil energy sources brings serious atmospheric pollution problems and large-scale carbon emission, so that the high-quality development progress of society is restricted.
How to transfer renewable energy sources in the western region and the three north regions to the eastern region with high efficiency and how to reduce emission are important problems to be solved urgently. At present, renewable energy sources are used for producing hydrogen and then delivering the hydrogen in a long distance, which is a feasible way, but the cost is high and the safety problem exists. Therefore, other energy conversion and remote transmission modes must be searched, carbon emission is reduced, and better comprehensive benefits are realized.
Disclosure of Invention
The invention aims to solve the technical problems of providing an energy conversion and remote transmission mode, reducing carbon emission and realizing better comprehensive benefits.
In order to solve the technical problems, the technical scheme of the invention is to provide a closed energy conversion remote transmission and carbon fixation system taking magnesium as a carrier, which is characterized in that: comprises a magnesium electrolysis subsystem, a magnesium and water reaction power generation subsystem and a hydrogen production subsystem and a carbon fixation subsystem which utilize renewable energy sources to electrically electrolyze magnesium;
the subsystem for electrolyzing magnesium by using renewable energy power comprises a renewable energy power plant, wherein a redundant power transmission system of the renewable energy power plant is connected with a magnesium electrolysis plant, and the magnesium electrolysis plant is connected with a magnesium supply device through a transportation link;
the magnesium-water reaction power generation and hydrogen production subsystem comprises a supercritical carbon dioxide circulation loop and a magnesium-water reaction loop;
the supercritical carbon dioxide circulation loop comprises a compressor, wherein an outlet of the compressor is divided into two paths, one path is connected with a low-temperature side inlet of the low-temperature heat regenerator, and the other path is connected with an inlet of the magnesia carbon fixing device; the low-temperature side outlet of the low-temperature heat regenerator is connected with the low-temperature side inlet of the high-temperature heat regenerator after being converged with the outlet of the magnesia carbon fixing device, the low-temperature side outlet of the high-temperature heat regenerator is connected with the carbon dioxide side inlet of the reactor, the carbon dioxide side outlet of the reactor is connected with the turbine inlet, the turbine outlet is connected with the high-temperature side inlet of the high-temperature heat regenerator, the high-temperature side outlet of the high-temperature heat regenerator is connected with the high-temperature side inlet of the low-temperature heat regenerator, the high-temperature side outlet of the low-temperature heat regenerator is connected with the precooler inlet, and the precooler outlet is connected with the compressor inlet;
the magnesium and water reaction loop comprises a water feed pump, an outlet of the water feed pump is connected with a water side inlet of a cooler, an outlet of the water side of the cooler is connected with a water inlet of a reactor, a gas product outlet of the reactor is connected with a product side inlet of the cooler, an outlet of the product side of the cooler is connected with a water separator, a gas outlet of the water separator is connected with a hydrogen collecting device, and a magnesium supply device is connected with a magnesium inlet of the reactor;
the carbon fixing subsystem comprises a magnesium oxide carbon fixing device and a carbon dioxide supply device, wherein a solid product outlet of the reactor is connected with a solid inlet of the magnesium oxide carbon fixing device, and the carbon dioxide supply device is connected with a gas inlet of the magnesium oxide carbon fixing device.
Preferably, the turbine is connected to an electrical generator.
The invention also provides a closed energy conversion remote transmission and carbon fixation method using magnesium as a carrier, which is characterized by comprising the following steps of:
step 1: redundant power of the renewable energy power plant is provided for an electrolytic magnesium plant, and magnesium produced by the electrolytic magnesium plant is conveyed to a magnesium supply device at a use place through a transportation link;
step 2: the magnesium supply device inputs magnesium into the reactor, the water supply pump supplies water to the reactor, and the magnesium reacts with the water in the reactor to generate magnesium oxide and hydrogen, and Mg+H 2 O＝MgO+H 2 The water separator separates water in the hydrogen and water mixture, the hydrogen enters the hydrogen collecting device, and the heat released by the reactor is transferred to the carbon dioxide;
step 3: the carbon dioxide working medium at the outlet of the compressor is divided into two paths: one path of the carbon dioxide working medium enters a low-temperature heat regenerator, the other path of the carbon dioxide working medium enters a magnesium oxide carbon fixing device to absorb carbonation reaction heat, the two paths of carbon dioxide working medium are converged and enter a high-temperature heat regenerator, then enter a reactor to absorb heat, then enter a turbine to expand and do work, turbine exhaust enters the high-temperature heat regenerator and the low-temperature heat regenerator to transfer part of heat to the carbon dioxide working medium, then the carbon dioxide working medium is cooled by a precooler, and finally returns to a compressor;
step 4: the carbon dioxide supply device inputs carbon dioxide to the magnesia carbon fixing device, the reactor outputs solid products to the magnesia carbon fixing device, carbonation reaction occurs in the magnesia carbon fixing device, and MgO+CO is generated 2 ＝MgCO 3 The reaction heat is transferred to the carbon dioxide working medium in the supercritical carbon dioxide circulation.
Preferably, in the step 1, the raw material of the electrolytic magnesium in the electrolytic magnesium plant is magnesium chloride.
Preferably, in the step 2, the reaction temperature of magnesium and water in the reactor is 650-1000 ℃ and the pressure is 20-40MPa.
Preferably, in the step 3, the turbine expands to do work to drive the generator to generate electric energy.
Preferably, in the step 4, the carbonation reaction temperature in the magnesia carbon fixing device is 200-500 ℃ and the pressure is more than 8 MPa.
Compared with the prior art, the closed energy conversion remote transmission and carbon fixation system taking magnesium as a carrier has the following beneficial effects:
1. the renewable energy sources can be consumed in a large amount, particularly, solar power generation, wind power and water power in Qinghai province in China are rich, the magnesium electrolysis industry is very developed, and a magnesium electrolysis factory can consume the renewable energy sources in a large amount on site to convert electric energy into magnesium with higher efficiency, so that the problems of wind discarding, light discarding and water discarding are avoided.
2. The large-scale long-distance transmission of energy can be realized, magnesium is light metal, has stable chemical property, is nontoxic and harmless, and the large-scale energy transmission mode using magnesium as a carrier is economical and safe.
3. Can prepare high-quality hydrogen, and magnesium reacts with water to generate magnesium oxide and hydrogen (Mg+H) 2 O＝MgO+H 2 ) The generated hydrogen has high quality and can react under high pressure, so that high-pressure hydrogen is directly prepared, and the compression power consumption of the hydrogen is saved.
4. Oxygen, a reactant for fixing carbon dioxide, magnesium and waterMagnesium oxide absorbs carbon dioxide (MgO+CO) by chemical process 2 ＝MgCO 3 ) Very stable magnesium carbonate is produced, which is a permanent, stable carbon fixation mode, and the whole process is carbon negative emission.
5. The heat can be provided for the supercritical carbon dioxide circulating generator set, the high-temperature reaction heat released by the reaction of magnesium and water can be used for generating electricity, and the reaction heat released by the carbonation reaction can also be used for generating electricity.
Drawings
FIG. 1 is a schematic diagram of a closed energy conversion remote transmission and carbon fixation system using magnesium as a carrier according to the embodiment;
reference numerals illustrate:
1-compressor, 2-low temperature regenerator, 3-high temperature regenerator, 4-turbine, 5-generator, 6-precooler, 7-feed pump, 8-cooler, 9-reactor, 10-water separator, 11-hydrogen collection device, 12-magnesium supply device, 13-carbon dioxide supply device, 14-magnesia carbon fixation device, 15-renewable energy power plant, 16-electrolytic magnesium plant, 17-transportation link.
Detailed Description
The invention will be further illustrated with reference to specific examples.
Fig. 1 is a schematic diagram of a closed energy conversion remote transmission and carbon fixation system using magnesium as a carrier according to the present embodiment, where the closed energy conversion remote transmission and carbon fixation system using magnesium as a carrier includes a renewable energy power plant 15, and the renewable energy power plant 15 transmits redundant power to an electrolytic magnesium plant 16, where the electrolytic magnesium plant 16 produces magnesium and transmits the magnesium to a magnesium supply device 12 at a use site through a remote transportation link 17 (transportation modes such as a waterway, a railway, a highway, etc.). The raw material of the electrolytic magnesium is magnesium chloride which can be obtained from a western salt lake.
In the supercritical carbon dioxide circulation loop, the outlet of the compressor 1 is divided into two paths, one path is connected with the low-temperature side inlet of the low-temperature heat regenerator 2, and the other path is connected with the inlet of the magnesia carbon fixing device 14; the outlet of the low temperature side of the low temperature heat regenerator 2 is connected with the inlet of the low temperature side of the high temperature heat regenerator 3 after being converged with the outlet of the magnesia carbon fixing device 14, the outlet of the low temperature side of the high temperature heat regenerator 3 is connected with the inlet of the carbon dioxide side of the reactor 9, the outlet of the carbon dioxide side of the reactor 9 is connected with the inlet of the turbine 4, the outlet of the turbine 4 is connected with the inlet of the high temperature side of the high temperature heat regenerator 3, the outlet of the high temperature side of the high temperature heat regenerator 3 is connected with the inlet of the high temperature side of the low temperature heat regenerator 2, the outlet of the high temperature side of the low temperature heat regenerator 2 is connected with the inlet of the precooler 6, and the outlet of the precooler 6 is connected with the inlet of the compressor 1; the generator 5 is connected to the turbine 4.
In the magnesium and water reaction loop, an outlet of a water feed pump 7 is connected with a water side inlet of a cooler 8, a water side outlet of the cooler 8 is connected with a water inlet of a reactor 9, a gas product outlet of the reactor 9 is connected with a product side inlet of the cooler 8, a product side outlet of the cooler 8 is connected with a water separator 10, a gas outlet of the water separator 10 is connected with a hydrogen collecting device 11, and a magnesium supply device 12 is connected with a magnesium inlet of the reactor 9.
The solid product outlet of the reactor 9 is connected with the solid inlet of the magnesia carbon fixing device 14, and the carbon dioxide supply device 13 is connected with the gas inlet of the magnesia carbon fixing device 14.
The implementation method of the closed energy conversion remote transmission and carbon fixation system taking magnesium as a carrier comprises the following steps:
the redundant power of the renewable energy power plant 15 is provided to the electrolytic magnesium plant 16, the raw material of the electrolytic magnesium is magnesium chloride which can come from a western salt lake, and the magnesium produced by the electrolytic magnesium plant 16 is transported to a using place through a long-distance transportation link 17.
Magnesium reacts with water in the reactor 9 to form hydrogen and magnesium oxide, a water supply pump 7 supplies water to the reactor 9, the pressure of the water depends on the pressure of product hydrogen, the water mixture of the hydrogen and the water discharged from the reactor 9 is cooled by a cooler 8, a water separator 10 separates water in the mixture of the hydrogen and the water, the hydrogen enters a hydrogen collecting device 11, a magnesium supply device 12 inputs magnesium into the reactor 9, and heat released by the reactor 9 is transferred to carbon dioxide.
The carbon dioxide working medium at the outlet of the compressor 1 is divided into two paths, one path enters the low-temperature heat regenerator 2, the other path enters the magnesium oxide carbon fixing device 14 to absorb carbonation reaction heat, the two paths of carbon dioxide working medium which are discharged are converged and enter the high-temperature heat regenerator 3, then enter the reactor 9 to absorb heat, then enter the turbine 4 to expand and do work to push the generator 5 to generate electric energy, and the turbine 4 exhaust enters the high-temperature heat regenerator 3 and the low-temperature heat regenerator 2 to transfer part of heat to the carbon dioxide working medium, then is cooled by the precooler 6 and finally returns to the compressor 1.
The carbon dioxide supply device 13 inputs carbon dioxide to the magnesia carbon fixation device 14, the reactor 9 outputs a solid product to the magnesia carbon fixation device 14, and the carbonation reaction heat in the magnesia carbon fixation device 14 is transferred to the carbon dioxide.
While the invention has been described with respect to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and additions may be made without departing from the scope of the invention. Equivalent embodiments of the present invention will be apparent to those skilled in the art having the benefit of the teachings disclosed herein, when considered in the light of the foregoing disclosure, and without departing from the spirit and scope of the invention; meanwhile, any equivalent changes, modifications and evolution of the above embodiments according to the essential technology of the present invention still fall within the scope of the technical solution of the present invention.
Claims (7)
1. A closed energy conversion remote transmission and carbon fixation system taking magnesium as a carrier is characterized in that: comprises a magnesium electrolysis subsystem, a magnesium and water reaction power generation subsystem and a hydrogen production subsystem and a carbon fixation subsystem which utilize renewable energy sources to electrically electrolyze magnesium;
the subsystem for electrolyzing magnesium by using renewable energy power comprises a renewable energy power plant (15), wherein a redundant power transmission system of the renewable energy power plant (15) is connected with an electrolytic magnesium plant (16), and the electrolytic magnesium plant (16) is connected with a magnesium supply device (12) through a transportation link (17);
the magnesium-water reaction power generation and hydrogen production subsystem comprises a supercritical carbon dioxide circulation loop and a magnesium-water reaction loop;
the supercritical carbon dioxide circulation loop comprises a compressor (1), wherein an outlet of the compressor (1) is divided into two paths, one path is connected with a low-temperature side inlet of the low-temperature heat regenerator (2), and the other path is connected with an inlet of the magnesia carbon fixing device (14); the low-temperature side outlet of the low-temperature heat regenerator (2) is connected with the low-temperature side inlet of the high-temperature heat regenerator (3) after being converged with the outlet of the magnesia carbon fixing device (14), the low-temperature side outlet of the high-temperature heat regenerator (3) is connected with the carbon dioxide side inlet of the reactor (9), the carbon dioxide side outlet of the reactor (9) is connected with the inlet of the turbine (4), the outlet of the turbine (4) is connected with the high-temperature side inlet of the high-temperature heat regenerator (3), the high-temperature side outlet of the high-temperature heat regenerator (3) is connected with the high-temperature side inlet of the low-temperature heat regenerator (2), the high-temperature side outlet of the low-temperature heat regenerator (2) is connected with the inlet of the precooler (6), and the outlet of the precooler (6) is connected with the inlet of the compressor (1);
the magnesium and water reaction loop comprises a water feeding pump (7), an outlet of the water feeding pump (7) is connected with a water side inlet of a cooler (8), a water side outlet of the cooler (8) is connected with a water inlet of a reactor (9), a gas product outlet of the reactor (9) is connected with a product side inlet of the cooler (8), a product side outlet of the cooler (8) is connected with a water separator (10), a gas outlet of the water separator (10) is connected with a hydrogen collecting device (11), and a magnesium supply device (12) is connected with a magnesium inlet of the reactor (9);
the carbon fixing subsystem comprises a magnesium oxide carbon fixing device (14) and a carbon dioxide supply device (13), wherein a solid product outlet of the reactor (9) is connected with a solid inlet of the magnesium oxide carbon fixing device (14), and the carbon dioxide supply device (13) is connected with a gas inlet of the magnesium oxide carbon fixing device (14).
2. The closed energy conversion remote transmission and carbon fixation system using magnesium as a carrier as claimed in claim 1, wherein: the turbine (4) is connected with a generator (5).
3. A closed energy conversion remote transmission and carbon fixation method using magnesium as a carrier, characterized in that the closed energy conversion remote transmission and carbon fixation system using magnesium as a carrier as claimed in claim 1 or 2 comprises the following steps:
step 1: redundant power of the renewable energy power plant (15) is provided for an electrolytic magnesium plant (16), and magnesium produced by the electrolytic magnesium plant (16) is conveyed to a magnesium supply device (12) at a using place through a conveying link (17);
step 2: the magnesium supply device (12) inputs magnesium into the reactor (9), the water supply pump (7) supplies water to the reactor (9), and the magnesium reacts with the water in the reactor (9) to generate magnesium oxide and hydrogen, and Mg+H 2 O＝MgO+H 2 And cooling the reactor (9) by means of a cooler (8)) The water in the mixture of the hydrogen and the water is separated by a water separator (10), the hydrogen enters a hydrogen collecting device (11), and the heat released by a reactor (9) is transferred to carbon dioxide;
step 3: the carbon dioxide working medium at the outlet of the compressor (1) is divided into two paths: one path enters a low-temperature heat regenerator (2), the other path enters a magnesium oxide carbon fixing device (14) to absorb carbonation reaction heat, two paths of carbon dioxide working media which come out are converged and enter a high-temperature heat regenerator (3), then enter a reactor (9) to absorb heat, then enter a turbine (4) to expand and apply work, and the exhaust gas of the turbine (4) enters the high-temperature heat regenerator (3) and the low-temperature heat regenerator (2) to transfer part of heat to the carbon dioxide working media, then the carbon dioxide working media are cooled by a precooler (6) and finally return to a compressor (1);
step 4: the carbon dioxide supply device (13) inputs carbon dioxide to the magnesia carbon fixing device (14), the reactor (9) outputs solid products to the magnesia carbon fixing device (14), carbonation reaction occurs in the magnesia carbon fixing device (14), and MgO+CO is added 2 ＝MgCO 3 The reaction heat is transferred to the carbon dioxide working medium in the supercritical carbon dioxide circulation.
4. A closed energy conversion remote transmission and carbon fixation method using magnesium as carrier as claimed in claim 3, wherein: in the step 1, the raw material of the electrolytic magnesium in the electrolytic magnesium plant (16) is magnesium chloride.
5. A closed energy conversion remote transmission and carbon fixation method using magnesium as carrier as claimed in claim 3, wherein: in the step 2, the reaction temperature of magnesium and water in the reactor (9) is 650-1000 ℃ and the pressure is 20-40MPa.
6. A closed energy conversion remote transmission and carbon fixation method using magnesium as carrier as claimed in claim 3, wherein: in the step 3, the turbine (4) expands to do work so as to push the generator to generate electric energy.
7. A closed energy conversion remote transmission and carbon fixation method using magnesium as carrier as claimed in claim 3, wherein: in the step 4, the carbonation reaction temperature in the magnesia carbon fixing device (14) is 200-500 ℃ and the pressure is more than 8 MPa.
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