CN114655923A - System and method for hydrogen and electricity cogeneration of coal-fired boiler - Google Patents
System and method for hydrogen and electricity cogeneration of coal-fired boiler Download PDFInfo
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- CN114655923A CN114655923A CN202210428027.5A CN202210428027A CN114655923A CN 114655923 A CN114655923 A CN 114655923A CN 202210428027 A CN202210428027 A CN 202210428027A CN 114655923 A CN114655923 A CN 114655923A
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- carbon dioxide
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- coal
- boiler
- heat exchanger
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- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 55
- 239000001257 hydrogen Substances 0.000 title claims abstract description 55
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000005611 electricity Effects 0.000 title claims description 12
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 258
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 129
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 129
- 229910000043 hydrogen iodide Inorganic materials 0.000 claims abstract description 87
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 claims abstract description 78
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 72
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 claims abstract description 58
- 229910052740 iodine Inorganic materials 0.000 claims abstract description 58
- 239000011630 iodine Substances 0.000 claims abstract description 58
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 54
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims abstract description 54
- 239000003546 flue gas Substances 0.000 claims abstract description 54
- 238000010248 power generation Methods 0.000 claims abstract description 50
- 238000011084 recovery Methods 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000000843 powder Substances 0.000 claims abstract description 24
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 23
- 238000000926 separation method Methods 0.000 claims abstract description 22
- 239000000428 dust Substances 0.000 claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 claims abstract description 18
- GOIGHUHRYZUEOM-UHFFFAOYSA-N [S].[I] Chemical compound [S].[I] GOIGHUHRYZUEOM-UHFFFAOYSA-N 0.000 claims abstract description 9
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000002485 combustion reaction Methods 0.000 claims description 11
- 239000003245 coal Substances 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 238000010298 pulverizing process Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 2
- 150000002431 hydrogen Chemical class 0.000 abstract description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- 238000006477 desulfuration reaction Methods 0.000 description 6
- 230000023556 desulfurization Effects 0.000 description 6
- 239000001117 sulphuric acid Substances 0.000 description 4
- 235000011149 sulphuric acid Nutrition 0.000 description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000003203 everyday effect Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- C01B3/04—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by decomposition of inorganic compounds, e.g. ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1481—Removing sulfur dioxide or sulfur trioxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1493—Selection of liquid materials for use as absorbents
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/69—Sulfur trioxide; Sulfuric acid
- C01B17/74—Preparation
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/69—Sulfur trioxide; Sulfuric acid
- C01B17/88—Concentration of sulfuric acid
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/13—Iodine; Hydrogen iodide
- C01B7/135—Hydrogen iodide
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/13—Iodine; Hydrogen iodide
- C01B7/14—Iodine
-
- 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
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
-
- 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
-
- 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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/006—Layout of treatment plant
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- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
- C01B2203/02—Processes for making hydrogen or synthesis gas
- C01B2203/0266—Processes for making hydrogen or synthesis gas containing a decomposition step
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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
- C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
- C01B2203/08—Methods of heating or cooling
- C01B2203/0805—Methods of heating the process for making hydrogen or synthesis gas
- C01B2203/0833—Heating by indirect heat exchange with hot fluids, other than combustion gases, product gases or non-combustive exothermic reaction product gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/10—Nitrogen; Compounds thereof
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- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Treating Waste Gases (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention relates to a coal-fired boiler hydrogen-electricity cogeneration system and a coal-fired boiler hydrogen-electricity cogeneration method, wherein the system couples a coal-fired boiler and sulfur-iodine circulating hydrogen production with supercritical carbon dioxide power generation to perform hydrogen-electricity cogeneration and comprises a coal-fired carbon dioxide boiler, a carbon dioxide power generation system, a high-temperature heat exchanger, a medium-temperature heat exchanger, a denitration module, a low-temperature heat exchanger, an air preheater, a dust remover, a draught fan, a Bunsen reactor, a flue gas emission system, a separation system, a hydrogen iodide solution concentration and rectification system, a hydrogen iodide decomposition system, an iodine recovery system, a hydrogen collection and storage system, a sulfuric acid collection and storage system, an air supply system, an air powder system and a water supply system. The method uses the iodine solution to absorb the sulfur dioxide in the boiler flue gas, does not generate extra carbon dioxide emission, and can recycle the iodine, thereby having lower operation cost; the sulfur dioxide which is a polluting gas generated by the boiler is used for producing hydrogen, so that the pollution is reduced, and the energy is increased; the supercritical carbon dioxide power generation is enabled to work at the highest efficiency temperature section, and the power generation efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of thermal power, environmental protection and hydrogen production, and particularly relates to a system and a method for hydrogen-electricity cogeneration of a coal-fired boiler.
Background
The flue gas of a coal-fired unit contains sulfur dioxide, most of the current flue gas is prepared by burning calcium carbonate into calcium oxide, grinding the calcium oxide into powder and preparing slurry, so that the sulfur dioxide is absorbed by the flue gas containing the sulfur dioxide through the slurry to generate calcium sulfate, and the desulfurization is carried out. This desulfurization process releases the solidified carbon dioxide from the calcium carbonate and thus the desulfurization process additionally increases carbon emissions. In addition, calcium carbonate is required to be continuously used in the desulfurization process, and the cost of raw materials is high.
The supercritical carbon dioxide power generation is a technology which is relatively hot in large-scale application recently, the technical system and equipment are few, the power generation efficiency is high, and carbon dioxide is used for replacing water, so that water resources are saved. However, in order to reduce the carbon dioxide compression work, it is necessary to reduce the temperature of part of the carbon dioxide to near the critical point, and an external medium is required to cool the carbon dioxide, which results in a waste of part of the heat.
The sulfur-iodine circulation hydrogen production is a thermochemical hydrogen production method, and compared with the hydrogen production by electrolysis, the method has the advantage that a link of converting heat into electricity is omitted, so that the hydrogen production efficiency is greatly improved. But the sulfur-iodine circulation hydrogen production needs to utilize a high-temperature heat source above 800 ℃ in a strong corrosive environment, and is difficult to apply in large-scale industry.
Disclosure of Invention
The invention aims to provide a system and a method for hydrogen-electricity cogeneration of a coal-fired boiler aiming at the defects of the prior art.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
a coal-fired boiler hydrogen-electricity cogeneration system couples a coal-fired boiler, sulfur-iodine circulation hydrogen production and supercritical carbon dioxide power generation to perform hydrogen-electricity cogeneration, and comprises a coal-fired carbon dioxide boiler, a carbon dioxide power generation system and a high-temperature heat exchanger; wherein,
the first outlet of the coal-fired carbon dioxide boiler is connected with the inlet of the high-temperature heat exchanger, the second outlet of the coal-fired carbon dioxide boiler is connected with the first inlet of the carbon dioxide power generation system, and the first outlet of the carbon dioxide power generation system is connected with the second inlet of the coal-fired carbon dioxide boiler.
The invention has the further improvement that the working medium in the coal-fired carbon dioxide boiler pipe is carbon dioxide, the temperature of the carbon dioxide after absorbing heat in the coal-fired carbon dioxide boiler reaches over 620 ℃, the pressure reaches over 28MPa, the working medium outside the coal-fired carbon dioxide boiler pipe is flue gas containing sulfur dioxide generated by coal combustion, and the carbon dioxide power generation system comprises a carbon dioxide turbine, a compressor, a heat regenerator, a cooler and accessory equipment thereof.
The invention is further improved in that the high-temperature heat exchanger is a flue gas-hydrogen iodide heat exchanger, and hydrogen iodide absorbs the heat of the flue gas in the high-temperature heat exchanger and is heated to more than 500 ℃.
The invention has the further improvement that the system also comprises a medium-temperature heat exchanger, a denitration module, a low-temperature heat exchanger, an air preheater, a dust remover, an induced draft fan and a Bunsen reactor;
the export of high temperature heat exchanger connects the entry at the medium temperature heat exchanger, and the export of medium temperature heat exchanger connects the entry at the denitration module, and the export of denitration module connects the entry at low temperature heat exchanger, and the export of low temperature heat exchanger connects the first entry at the air preheater, and the first export of air preheater connects the entry at the dust remover, and the export of dust remover connects the entry at the draught fan, and the export of draught fan connects the first entry at this living reactor.
The invention has the further improvement that the medium temperature heat exchanger is a flue gas-hydrogen iodide solution heat exchanger, and the hydrogen iodide solution is concentrated and rectified in the medium temperature heat exchanger to generate hydrogen iodide.
The invention has the further improvement that the flue gas from the medium-temperature heat exchanger enters the Bunsen reactor through a denitration module, a low-temperature heat exchanger, an air preheater, a dust remover and an induced draft fan, the low-temperature heat exchanger is a flue gas-hydrogen iodide solution heat exchanger, the hydrogen iodide solution is preheated in the low-temperature heat exchanger, the Bunsen reactor is a circulating spray absorption tower type reactor, and a circulating pump, a stirrer, a spray layer and a demisting layer are arranged in the reactor.
The invention has the further improvement that the device also comprises a flue gas discharge system, a separation system, a hydrogen iodide solution concentration and rectification system, a hydrogen iodide decomposition system, an iodine recovery system, a hydrogen storage system, a sulfuric acid storage system and a water supply system;
the first outlet of the Bunsen reactor is connected with the inlet of the flue gas discharge system, the second outlet of the Bunsen reactor is connected with the inlet of the separation system, the first outlet of the separation system is connected with the inlet of the concentrated rectification system of the hydrogen iodide solution, the second outlet of the separation system is connected with the inlet of the sulfuric acid storage system, the outlet of the concentrated rectification system of the hydrogen iodide solution is connected with the inlet of the hydrogen iodide decomposition system, the first outlet of the hydrogen iodide decomposition system is connected with the inlet of the hydrogen storage system, the second outlet of the hydrogen iodide decomposition system is connected with the inlet of the iodine recovery system, the outlet of the iodine recovery system is connected with the second inlet of the Bunsen reactor, and the outlet of the water supply system is connected with the third inlet of the Bunsen reactor.
The invention has the further improvement that sulfur dioxide in the flue gas entering the Bunsen reactor reacts with iodine recovered from an iodine recovery system and water from a water supply system to generate a hydrogen iodide solution and a sulfuric acid solution, the flue gas discharged from the Bunsen reactor is discharged through a flue gas discharge system, the hydrogen iodide solution and the sulfuric acid solution generated by the Bunsen reactor enter a separation system, the sulfuric acid solution and the hydrogen iodide solution are separated in the separation system, the sulfuric acid solution enters a sulfuric acid storage system, the hydrogen iodide solution enters a hydrogen iodide solution concentration and rectification system to be concentrated and rectified and then enters a hydrogen iodide decomposition system to be decomposed into hydrogen and iodine, the hydrogen enters a hydrogen storage system, and the iodine enters an iodine recovery system.
The invention has the further improvement that the invention also comprises an air supply system and an air powder system;
the outlet of the air supply system is connected with the second inlet of the carbon dioxide power generation system, the second outlet of the carbon dioxide power generation system is connected with the second inlet of the air preheater, the second outlet of the air preheater is connected with the inlet of the air-powder system, and the outlet of the air-powder system is connected with the first inlet of the coal-fired carbon dioxide boiler;
the cooler of the carbon dioxide power generation system is arranged at the inlet of the air supply system, the air entering the air supply system absorbs the heat of the carbon dioxide which does work in the carbon dioxide power generation system, the carbon dioxide is cooled to a position near a critical point, the air coming out of the air supply system enters the air preheater and is further heated, then enters the air powder system for pulverizing and providing combustion-supporting air for pulverized coal combustion, and the air powder and the combustion-supporting air enter the coal-fired carbon dioxide boiler for combustion to generate high-temperature flue gas containing sulfur dioxide.
A coal-fired boiler hydrogen-electricity co-production method is based on the coal-fired boiler hydrogen-electricity co-production system and comprises the following steps:
filling carbon dioxide into the coal-fired carbon dioxide boiler pipe and the carbon dioxide power generation system, and establishing carbon dioxide loop pressure and carbon dioxide circulation;
starting an air preheater, a dust remover, an induced draft fan and an air supply system, and discharging air through an air supply system, a carbon dioxide power generation system, the starting air preheater, the dust remover, the induced draft fan and a Bunsen reactor through a flue gas discharge system;
adding water into a Bunsen reactor through a water supply system, adding iodine into the Bunsen reactor through an iodine recovery system, forming an iodine solution in the Bunsen reactor, starting a circulating pump in the Bunsen reactor, and establishing iodine solution spraying circulation in the Bunsen reactor;
starting an air powder system, feeding powder to a coal-fired carbon dioxide boiler, igniting the boiler, denitrifying the sulfur dioxide-containing flue gas generated by the boiler through a denitrification module, dedusting by a deduster, and discharging the flue gas which reaches the standard after absorbing sulfur dioxide by a Bunsen reactor through a flue gas discharge system;
the load of the boiler is gradually increased, the flue gas temperature of the coal-fired carbon dioxide boiler is gradually increased, the carbon dioxide temperature of the carbon dioxide power generation system is gradually increased, and the electric load sent out by the carbon dioxide power generation system is gradually increased;
along with the increase of the load of a coal-fired carbon dioxide boiler, the solution in the Bunsen reactor absorbs more sulfur dioxide, the iodine dissolving capacity is increased, more iodine is added into the Bunsen reactor through an iodine recovery system, when the solution density in the Bunsen reactor reaches A, the solution enters a separation system to separate a hydrogen iodide solution and a sulfuric acid solution, the sulfuric acid solution enters a sulfuric acid storage system, the hydrogen iodide solution enters a hydrogen iodide solution concentration rectification system to be concentrated and rectified to generate hydrogen iodide, and the heat required by the concentration and rectification is obtained from a low-temperature heat exchanger and a medium-temperature heat exchanger;
the hydrogen iodide is decomposed into hydrogen and iodine in the hydrogen iodide decomposition system, the heat required by the decomposition comes from the high-temperature heat exchanger, the hydrogen enters the hydrogen storage system, and the iodine enters the iodine recovery system.
Compared with the prior art, the invention has at least the following beneficial technical effects:
compared with the system commonly used at present, the system and the method for the hydrogen-electricity cogeneration of the coal-fired boiler have the following obvious advantages:
1) according to the method, the iodine solution is used for absorbing sulfur dioxide in the boiler flue gas, no extra carbon dioxide emission is generated, the iodine can be recycled, and the operation cost is low;
2) the sulfur dioxide which is a polluting gas generated by the boiler is used for producing hydrogen, so that the pollution is reduced, and the energy is increased;
3) the supercritical carbon dioxide power generation can work at the highest efficiency temperature section, and the power generation efficiency is greatly improved;
4) heat generated by a boiler is used in a stepped manner, heat in a high-temperature section is used for generating power, heat in a high-temperature section and a middle-temperature section is used for supplying the heat to a sulfur-iodine circulating hydrogen production system for decomposing hydrogen iodide, and heat in the middle-temperature section and the low-temperature section is used for concentrating and rectifying a hydrogen iodide solution and concentrating sulfuric acid;
5) because the sulfur-iodine circulation hydrogen production is carried out by the method, sulfur dioxide is not required to be prepared by decomposing sulfuric acid, the thermochemical hydrogen production can be realized without too high temperature (about 500 ℃), and a large-scale and high-efficiency hydrogen production way is provided;
6) the air required by the boiler is used for cooling the carbon dioxide in the supercritical carbon dioxide power generation cycle, so that the system is simplified, and meanwhile, the waste heat is utilized, and the utilization efficiency of heat is improved;
7) almost the full amount of heat generated by the boiler is used.
Drawings
FIG. 1 is a block diagram of a system for co-generation of hydrogen and electricity for a coal-fired boiler according to the present invention.
Description of reference numerals:
1. coal-fired carbon dioxide boiler, 2, carbon dioxide power generation system, 3, high temperature heat exchanger, 4, medium temperature heat exchanger, 5, denitration module, 6, low temperature heat exchanger, 7, air preheater, 8, dust remover, 9, draught fan, 10, bensheng reactor, 11, flue gas discharge system, 12, piece-rate system, 13, hydrogen iodide solution concentration rectification system, 14, hydrogen iodide decomposition system, 15, iodine recovery system, 16, hydrogen is received and is stored up the system, 17, sulphuric acid is received and is stored up the system, 18, air supply system, 19, wind powder system, 20, water supply system.
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 of the present invention 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 system for co-production of hydrogen and electricity by a coal-fired boiler, which couples a coal-fired boiler with sulfur-iodine cycle hydrogen production and supercritical carbon dioxide power generation to perform co-production of hydrogen and electricity, comprises a coal-fired carbon dioxide boiler 1, a carbon dioxide power generation system 2, a high-temperature heat exchanger 3, a medium-temperature heat exchanger 4, a denitration module 5, a low-temperature heat exchanger 6, an air preheater 7, a dust remover 8, an induced draft fan 9, a Bunsen reactor 10, a flue gas emission system 11, a separation system 12, a hydrogen iodide solution concentration and rectification system 13, a hydrogen iodide decomposition system 14, an iodine recovery system 15, a hydrogen storage system 16, a sulfuric acid storage system 17, an air supply system 18, an air powder system 19 and a water supply system 20.
A first outlet of the coal-fired carbon dioxide boiler 1 is connected with an inlet of the high-temperature heat exchanger 3, a second outlet of the coal-fired carbon dioxide boiler 1 is connected with a first inlet of the carbon dioxide power generation system 2, and a first outlet of the carbon dioxide power generation system 2 is connected with a second inlet of the coal-fired carbon dioxide boiler 1; an outlet of the high-temperature heat exchanger 3 is connected with an inlet of the medium-temperature heat exchanger 4, an outlet of the medium-temperature heat exchanger 4 is connected with an inlet of the denitration module 5, an outlet of the denitration module 5 is connected with an inlet of the low-temperature heat exchanger 6, an outlet of the low-temperature heat exchanger 6 is connected with a first inlet of the air preheater 7, a first outlet of the air preheater 7 is connected with an inlet of the dust remover 8, an outlet of the dust remover 8 is connected with an inlet of the induced draft fan 9, and an outlet of the induced draft fan 9 is connected with a first inlet of the Bunsen reactor 10; a first outlet of the Bunsen reactor 10 is connected with an inlet of the flue gas discharge system 11, a second outlet of the Bunsen reactor 10 is connected with an inlet of the separation system 12, a first outlet of the separation system 12 is connected with an inlet of the hydrogen iodide solution concentration and rectification system 13, a second outlet of the separation system 12 is connected with an inlet of the sulfuric acid storage system 17, an outlet of the hydrogen iodide solution concentration and rectification system 13 is connected with an inlet of the hydrogen iodide decomposition system 14, a first outlet of the hydrogen iodide decomposition system 14 is connected with an inlet of the hydrogen storage system 16, a second outlet of the hydrogen iodide decomposition system 14 is connected with an inlet of the iodine recovery system 15, an outlet of the iodine recovery system 15 is connected with a second inlet of the Bunsen reactor 10, and an outlet of the water supply system 20 is connected with a third inlet of the Bunsen reactor 10; the outlet of the air supply system 18 is connected with the second inlet of the carbon dioxide power generation system 2, the second outlet of the carbon dioxide power generation system 2 is connected with the second inlet of the air preheater 7, the second outlet of the air preheater 7 is connected with the inlet of the air powder system 19, and the outlet of the air powder system 19 is connected with the first inlet of the coal-fired carbon dioxide boiler 1.
The working medium in the coal-fired carbon dioxide boiler 1 is carbon dioxide, the temperature of the carbon dioxide after heat absorption in the coal-fired carbon dioxide boiler 1 is over 620 ℃, the pressure is over 28MPa, the working medium outside the coal-fired carbon dioxide boiler 1 is flue gas containing sulfur dioxide generated by coal combustion, and the carbon dioxide power generation system 2 comprises a carbon dioxide turbine, a compressor, a heat regenerator, a cooler and accessory equipment thereof. The high temperature heat exchanger 3 is a flue gas-hydrogen iodide heat exchanger, and hydrogen iodide absorbs the heat of the flue gas in the high temperature heat exchanger 3 and is heated to more than 500 ℃.
The medium temperature heat exchanger 4 is a flue gas-hydrogen iodide solution heat exchanger, and the hydrogen iodide solution is concentrated and rectified in the medium temperature heat exchanger 4 to generate hydrogen iodide. Flue gas coming out of the medium-temperature heat exchanger 4 passes through the denitration module 5 and the low-temperature heat exchanger 6, the air preheater 7, the dust remover 8 and the induced draft fan 9 and enters the Bunsen reactor 10, the low-temperature heat exchanger 6 is a flue gas-hydrogen iodide solution heat exchanger, hydrogen iodide solution is preheated in the low-temperature heat exchanger 6, the Bunsen reactor 10 is a circulating spray absorption tower type reactor, and a circulating pump, a stirrer, a spray layer and a demisting layer are arranged in the reactor.
The sulfur dioxide in the flue gas entering the Bunsen reactor 10 reacts with the iodine recovered from the iodine recovery system 15 and the water from the water supply system 20 to generate a hydrogen iodide solution and a sulfuric acid solution, the flue gas discharged from the Bunsen reactor 10 is discharged through the flue gas discharge system 11, the hydrogen iodide solution and the sulfuric acid solution generated by the Bunsen reactor 10 enter the separation system 12, the sulfuric acid solution and the hydrogen iodide solution are separated in the separation system 12, the sulfuric acid solution enters the sulfuric acid storage system 17, the hydrogen iodide solution enters the hydrogen iodide solution concentration and rectification system 13, is concentrated and rectified, then enters the hydrogen iodide decomposition system 14 to be decomposed into hydrogen and iodine, the hydrogen enters the hydrogen storage system 16, and the iodine enters the iodine recovery system 15.
The cooler of the carbon dioxide power generation system 2 is arranged at the inlet of the air supply system 18, the air entering the air supply system 18 absorbs the heat of the carbon dioxide which does work in the carbon dioxide power generation system 2, the carbon dioxide is cooled to the position near a critical point, the air coming out of the air supply system 18 enters the air preheater 7, is further heated and then enters the air powder system 19 for pulverizing and providing combustion air for pulverized coal combustion, and the air powder and the combustion air enter the coal-fired carbon dioxide boiler 1 for combustion to generate high-temperature flue gas containing sulfur dioxide.
The invention provides a coal-fired boiler hydrogen-electricity cogeneration method, which comprises the following steps:
filling carbon dioxide into the pipe of the coal-fired carbon dioxide boiler 1 and the carbon dioxide power generation system 2, and establishing carbon dioxide loop pressure and carbon dioxide circulation;
starting an air preheater 7, a dust remover 8, an induced draft fan 9 and an air supply system 18, and discharging air through the air supply system 18, the carbon dioxide power generation system 2, the starting air preheater 7, the dust remover 8, the induced draft fan 9 and the Bunsen reactor 10 through a flue gas discharge system 11;
adding water into a Bunsen reactor 10 through a water supply system 20, adding iodine into the Bunsen reactor 10 through an iodine recovery system 15, forming an iodine solution in the Bunsen reactor 10, starting a circulating pump in the Bunsen reactor 10, and establishing the iodine solution spraying circulation in the Bunsen reactor 10;
starting an air powder system 19, feeding powder to a coal-fired carbon dioxide boiler 1, igniting the boiler, denitrifying the sulfur dioxide-containing flue gas generated by the boiler through a denitrification module 5, dedusting by a deduster 8, and discharging the flue gas which reaches the standard after absorbing sulfur dioxide by a Bunsen reactor 10 through a flue gas discharge system 11;
the load of the boiler is gradually increased, the temperature of the flue gas of the coal-fired carbon dioxide boiler 1 is gradually increased, the temperature of the carbon dioxide power generation system 2 is gradually increased, and the electric load sent out by the carbon dioxide power generation system 2 is gradually increased;
along with the increase of the load of the coal-fired carbon dioxide boiler 1, the solution in the Bunsen reactor 10 absorbs more sulfur dioxide, the capacity of dissolving iodine is increased, more iodine is added into the Bunsen reactor 10 through an iodine recovery system 15, when the density of the solution in the Bunsen reactor 10 reaches A, the solution enters a separation system 12 to separate the hydrogen iodide solution from the sulfuric acid solution, the sulfuric acid solution enters a sulfuric acid storage system 17, the hydrogen iodide solution enters a hydrogen iodide solution concentration and rectification system 13 to be concentrated and rectified to generate hydrogen iodide, and the heat required by the concentration and rectification is obtained from a low-temperature heat exchanger 6 and a medium-temperature heat exchanger 4;
the hydrogen iodide is decomposed into hydrogen and iodine in the hydrogen iodide decomposition system 14, the heat required for the decomposition comes from the high-temperature heat exchanger 3, the hydrogen enters the hydrogen storage system 16, and the iodine enters the iodine recovery system 15.
Examples
The invention is adopted to build a carbon dioxide coal-fired boiler generating set which can generate 750MW heat, and the boiler burns fuel coal with 0.8% of sulfur content. The unit does not need a circulating water system, a condensate system, a water supply system, a deaerator system, a high-low pressure heater system, a main steam system and a demineralized water system, the system is greatly simplified, and the investment cost can be greatly reduced.
The temperature of the carbon dioxide can reach 620 ℃, the pressure reaches 28MPa, and the carbon dioxide is converted into a carbon dioxide turbine to generate 350 MW;
the air required by the combustion of the boiler is used for cooling the carbon dioxide after the carbon dioxide turbine works, the temperature of the carbon dioxide can be cooled to be close to the critical temperature, and an additional cold source is not needed in the carbon dioxide power generation system, so that the utilization efficiency of heat is improved;
the flue gas discharged by the boiler is introduced into a Bunsen reactor for producing hydrogen by sulfur-iodine circulation, the iodine solution absorbs sulfur dioxide in the flue gas to generate sulfuric acid and hydrogen iodide, the boiler does not need a desulfurization system any more, and the operation cost of the desulfurization system can be saved by about 2 ten thousand yuan each day;
obtaining 1200KW of heat at 200 ℃ from boiler flue gas for concentrating and rectifying hydrogen iodide solution;
230KW of heat of 500 ℃ is obtained from boiler flue gas to be used for decomposing hydrogen iodide, and 19200m can be generated every day3Hydrogen of 4 to 10 yuan10 ten thousand yuan can be generated;
iodine enters a Bunsen reactor for reuse;
the heat of obtaining 200KW from the boiler flue gas is used for carrying out the concentration of sulphuric acid, can obtain 90 tons of concentrated sulphuric acid every day, and every ton of sulphuric acid can produce 4.5 ten thousand yuan of income according to 500 yuan of calculation.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A coal-fired boiler hydrogen-electricity cogeneration system is characterized in that the system couples a coal-fired boiler, sulfur-iodine circulation hydrogen production and supercritical carbon dioxide power generation to perform hydrogen-electricity cogeneration, and comprises a coal-fired carbon dioxide boiler (1), a carbon dioxide power generation system (2) and a high-temperature heat exchanger (3); wherein,
the first outlet of the coal-fired carbon dioxide boiler (1) is connected with the inlet of the high-temperature heat exchanger (3), the second outlet of the coal-fired carbon dioxide boiler (1) is connected with the first inlet of the carbon dioxide power generation system (2), and the first outlet of the carbon dioxide power generation system (2) is connected with the second inlet of the coal-fired carbon dioxide boiler (1).
2. The system for the hydrogen and electricity cogeneration of the coal-fired boiler according to claim 1, wherein the working medium in the pipe of the coal-fired carbon dioxide boiler (1) is carbon dioxide, the temperature of the carbon dioxide after absorbing heat in the coal-fired carbon dioxide boiler (1) reaches over 620 ℃, the pressure of the carbon dioxide reaches over 28MPa, the working medium outside the pipe of the coal-fired carbon dioxide boiler (1) is flue gas containing sulfur dioxide generated by coal combustion, and the carbon dioxide power generation system (2) comprises a carbon dioxide turbine, a compressor, a heat regenerator, a cooler and auxiliary equipment thereof.
3. The system for the hydrogen and electricity cogeneration of a coal-fired boiler as claimed in claim 1, wherein the high temperature heat exchanger (3) is a flue gas-hydrogen iodide heat exchanger, and hydrogen iodide absorbs the heat of the flue gas in the high temperature heat exchanger (3) and is heated to more than 500 ℃.
4. The system for the hydrogen and electricity cogeneration of the coal-fired boiler according to claim 1, further comprising a medium-temperature heat exchanger (4), a denitration module (5), a low-temperature heat exchanger (6), an air preheater (7), a dust remover (8), an induced draft fan (9) and a Bunsen reactor (10);
the export of high temperature heat exchanger (3) connects in the entry of middle temperature heat exchanger (4), the export of middle temperature heat exchanger (4) connects in the entry of denitration module (5), the export of denitration module (5) connects in the entry of low temperature heat exchanger (6), the export of low temperature heat exchanger (6) connects in the first entry of air preheater (7), the first export of air preheater (7) connects in the entry of dust remover (8), the export of dust remover (8) connects in the entry of draught fan (9), the export of draught fan (9) connects in the first entry of this living reactor (10).
5. The coal-fired boiler hydrogen and power cogeneration system according to claim 4, wherein the medium temperature heat exchanger (4) is a flue gas-hydrogen iodide solution heat exchanger, and the hydrogen iodide solution is concentrated and rectified in the medium temperature heat exchanger (4) to produce hydrogen iodide.
6. The system for the cogeneration of hydrogen and electricity of a coal-fired boiler according to claim 4, wherein the flue gas from the medium temperature heat exchanger (4) passes through the denitration module (5) and the low temperature heat exchanger (6), the air preheater (7), the dust remover (8) and the induced draft fan (9) and enters the Bunsen reactor (10), the low temperature heat exchanger (6) is a flue gas-hydrogen iodide solution heat exchanger, the hydrogen iodide solution is preheated in the low temperature heat exchanger (6), the Bunsen reactor (10) is a circulating spray absorption tower type reactor, and the reactor is provided with a circulating pump, a stirrer, a spray layer and a demisting layer.
7. The coal-fired boiler hydrogen-electricity cogeneration system according to claim 4, further comprising a flue gas discharge system (11), a separation system (12), a hydrogen iodide solution concentration and rectification system (13), a hydrogen iodide decomposition system (14), an iodine recovery system (15), a hydrogen gas collection and storage system (16), a sulfuric acid collection and storage system (17) and a water supply system (20);
the first outlet of the Bunsen reactor (10) is connected with the inlet of the flue gas discharge system (11), the second outlet of the Bunsen reactor (10) is connected with the inlet of the separation system (12), the first outlet of the separation system (12) is connected with the inlet of the hydrogen iodide solution concentration and rectification system (13), the second outlet of the separation system (12) is connected with the inlet of the sulfuric acid storage system (17), the outlet of the hydrogen iodide solution concentration and rectification system (13) is connected with the inlet of the hydrogen iodide decomposition system (14), the first outlet of the hydrogen iodide decomposition system (14) is connected with the inlet of the hydrogen storage system (16), the second outlet of the hydrogen iodide decomposition system (14) is connected with the inlet of the iodine recovery system (15), the outlet of the iodine recovery system (15) is connected with the second inlet of the Bunsen reactor (10), and the outlet of the water supply system (20) is connected with the third inlet of the Bunsen reactor (10).
8. The system for co-generation of hydrogen and electricity of a coal-fired boiler according to claim 7, wherein sulfur dioxide in flue gas entering the Bunsen reactor (10) reacts with iodine recovered from an iodine recovery system (15) and water from a water supply system (20) to generate hydrogen iodide solution and sulfuric acid solution, the flue gas discharged from the Bunsen reactor (10) is discharged after passing through a flue gas discharge system (11), the hydrogen iodide solution and the sulfuric acid solution generated by the Bunsen reactor (10) enter a separation system (12), the sulfuric acid solution and the hydrogen iodide solution are separated in the separation system (12), the sulfuric acid solution enters a sulfuric acid storage system (17), the hydrogen iodide solution enters a hydrogen iodide solution concentration and rectification system (13) to be concentrated and rectified, then enters a hydrogen iodide decomposition system (14) to be decomposed into hydrogen and iodine, and the hydrogen enters a hydrogen storage system (16), the iodine enters an iodine recovery system (15).
9. The system for the hydrogen and electricity cogeneration of a coal-fired boiler as claimed in claim 7, further comprising an air supply system (18) and a wind powder system (19);
an outlet of the air supply system (18) is connected with a second inlet of the carbon dioxide power generation system (2), a second outlet of the carbon dioxide power generation system (2) is connected with a second inlet of the air preheater (7), a second outlet of the air preheater (7) is connected with an inlet of the air-powder system (19), and an outlet of the air-powder system (19) is connected with a first inlet of the coal-fired carbon dioxide boiler (1);
a cooler of the carbon dioxide power generation system (2) is arranged at an inlet of an air supply system (18), air entering the air supply system (18) absorbs heat of carbon dioxide doing work in the carbon dioxide power generation system (2), the carbon dioxide is cooled to a position near a critical point, air coming out of the air supply system (18) enters an air preheater (7) to be further heated and then enters an air powder system (19) to be used for pulverizing and providing combustion-supporting air for pulverized coal combustion, the air powder and the combustion-supporting air enter a coal-fired carbon dioxide boiler (1) to be combusted, and high-temperature flue gas containing sulfur dioxide is generated.
10. A coal-fired boiler hydrogen-electricity cogeneration method is based on the coal-fired boiler hydrogen-electricity cogeneration system of claim 9, and comprises the following steps:
carbon dioxide is filled into the pipe of the coal-fired carbon dioxide boiler (1) and the carbon dioxide power generation system (2), and carbon dioxide loop pressure and carbon dioxide circulation are established;
the method comprises the following steps that an air preheater (7), a dust remover (8), a draught fan (9) and an air supply system (18) are started, and air is exhausted through a flue gas exhaust system (11) through the air supply system (18), a carbon dioxide power generation system (2), the air preheater (7), the dust remover (8), the draught fan (9) and a Bunsen reactor (10);
adding water into a Bunsen reactor (10) through a water supply system (20), adding iodine into the Bunsen reactor (10) through an iodine recovery system (15), forming an iodine solution in the Bunsen reactor (10), starting a circulating pump in the Bunsen reactor (10), and establishing iodine solution spraying circulation in the Bunsen reactor (10);
starting an air powder system (19), feeding powder to a coal-fired carbon dioxide boiler (1), igniting the boiler, denitrifying the flue gas containing sulfur dioxide generated by the boiler through a denitrification module (5), dedusting by a deduster (8), and discharging the flue gas which reaches the standard after sulfur dioxide is absorbed by a Bunsen reactor (10) through a flue gas discharge system (11);
the load of the boiler is gradually increased, the temperature of the flue gas of the coal-fired carbon dioxide boiler (1) is gradually increased, the temperature of the carbon dioxide power generation system (2) is gradually increased, and the electric load sent out by the carbon dioxide power generation system (2) is gradually increased;
along with the increase of the load of a coal-fired carbon dioxide boiler (1), the solution in the Bunsen reactor (10) absorbs more sulfur dioxide, the capacity of dissolving iodine is increased, more iodine is added into the Bunsen reactor (10) through an iodine recovery system (15), when the solution density in the Bunsen reactor (10) reaches A, the solution enters a separation system (12) to separate hydrogen iodide solution and sulfuric acid solution, the sulfuric acid solution enters a sulfuric acid storage system (17), the hydrogen iodide solution enters a hydrogen iodide solution concentration and rectification system (13) to carry out concentration and rectification to generate hydrogen iodide, and the heat required by the concentration and rectification is obtained from a low-temperature heat exchanger (6) and a medium-temperature heat exchanger (4);
the hydrogen iodide is decomposed into hydrogen and iodine in a hydrogen iodide decomposition system (14), the heat required by the decomposition is from a high-temperature heat exchanger (3), the hydrogen enters a hydrogen storage system (16), and the iodine enters an iodine recovery system (15).
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| CN202210428027.5A CN114655923B (en) | 2022-04-22 | 2022-04-22 | System and method for cogeneration of hydrogen and electricity of coal-fired boiler |
| PCT/CN2022/142284 WO2023202139A1 (en) | 2022-04-22 | 2022-12-27 | System and method for hydrogen and power cogeneration of coal-fired boiler |
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| WO2023202139A1 (en) | 2023-10-26 |
| CN114655923B (en) | 2023-05-30 |
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