US20200056290A1 - Synthetic ammonia system for making hydrogen by electrolysis in thermal power plant - Google Patents
Synthetic ammonia system for making hydrogen by electrolysis in thermal power plant Download PDFInfo
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- US20200056290A1 US20200056290A1 US16/208,588 US201816208588A US2020056290A1 US 20200056290 A1 US20200056290 A1 US 20200056290A1 US 201816208588 A US201816208588 A US 201816208588A US 2020056290 A1 US2020056290 A1 US 2020056290A1
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- hydrogen
- thermal power
- power plant
- electrolysis
- ammonia
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 255
- 239000001257 hydrogen Substances 0.000 title claims abstract description 154
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 154
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 137
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 122
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 59
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 138
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 69
- 238000010248 power generation Methods 0.000 claims abstract description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 32
- 239000001301 oxygen Substances 0.000 claims description 32
- 229910052760 oxygen Inorganic materials 0.000 claims description 32
- 238000003860 storage Methods 0.000 claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 150000002431 hydrogen Chemical class 0.000 claims description 17
- 239000007789 gas Substances 0.000 claims description 16
- 239000000446 fuel Substances 0.000 claims description 14
- 239000000126 substance Substances 0.000 claims description 10
- 239000008213 purified water Substances 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 5
- 239000003546 flue gas Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 230000032258 transport Effects 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 239000003915 liquefied petroleum gas Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 239000003245 coal Substances 0.000 description 5
- 230000005611 electricity Effects 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 241001282153 Scopelogadus mizolepis Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Images
Classifications
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- 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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
- C01B13/02—Preparation of oxygen
- C01B13/0203—Preparation of oxygen from inorganic compounds
- C01B13/0207—Water
-
- 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
- C01B3/025—Preparation or purification of gas mixtures for ammonia synthesis
-
- 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
-
- 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
-
- 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
- C01C1/0488—Processes integrated with preparations of other compounds, e.g. methanol, urea or with processes for power generation
-
- 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
- C25B15/00—Operating or servicing cells
- C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy
-
- 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
- C01B2203/06—Integration with other chemical processes
- C01B2203/068—Ammonia synthesis
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy
- H02J15/008—Systems for storing electric energy using hydrogen as energy vector
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
-
- 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
-
- 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
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
-
- 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
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/50—Energy storage in industry with an added climate change mitigation effect
Definitions
- the present invention relates to the field of electrical energy and synthetic ammonia technologies, and in particular to a synthetic ammonia system for making hydrogen by electrolysis in a thermal power plant.
- the peak regulation in the thermal power plant has been a salient contradiction in the grid operation.
- the Chinese thermal power flexibility peak regulation transformation is targeted at heat supply units in winter.
- how to adjust a peak in summer is a problem many thermal power plants facing.
- the deep reformation of peak regulation should be performed.
- thermal power flexibility peak regulation and carbon emission reduction it is necessary for thermal power units to solve these problems.
- the electrolytic hydrogen making is efficient and clean, with a simple process and high product purity up to 99.9% (hydrogen and oxygen).
- hydrogen will become an ideal carrier for storing electric energy.
- the electric energy generated by the clean energy is converted into hydrogen energy to be stored, or as needed, the hydrogen energy is converted into methane, methyl alcohol and other liquid fuel by the subsequent chemical process.
- Ammonia is a very important chemical product for human. With the social development and progress in industrial civilization, a synthetic ammonia product has obvious contributions to human. As hydrogen storage fuel which is transported conveniently, many research units and energy companies think that ammonia is promising. Ammonia may be liquefied at a temperature of 20 degrees centigrade below zero, and thus may be transported conveniently with low costs; in addition, ammonia is also a fuel and refrigerant, not only for burning, but also for cooling. Currently, ammonia is mainly used for a SCR denitration system.
- the present invention is directed to providing a synthetic ammonia system for making hydrogen by electrolysis in a thermal power plant, which implements electrolytic hydrogen making and space division nitrogen and oxygen making by using peak regulation and frequency modulation power, then produces ammonia by the synthetic ammonia process using the resultant nitrogen and hydrogen, such that the power plant turns into an electrochemical plant of various gas and fuel products.
- a synthetic ammonia system for making hydrogen by electrolysis in a thermal power plant includes an electrolytic hydrogen making device and a synthetic ammonia equipment; a power input end of the electrolytic hydrogen making device is electrically connected with a power generation output end of the thermal power plant, so as to use peak regulation balance electric quantity of the thermal power plant to produce hydrogen and oxygen for power supply electrolysis; a hydrogen output end of the electrolysis hydrogen making device is connected with a hydrogen inlet of the synthetic ammonia equipment, a nitrogen inlet of the synthetic ammonia equipment is connected with a nitrogen source, the synthetic ammonia equipment is used for using the hydrogen produced by the electrolysis hydrogen making device and nitrogen of the nitrogen source to synthesize ammonia; an ammonia output end of the synthetic ammonia equipment is communicated to an ammonia supply pipeline and/or a liquid ammonia tank of the thermal power plant.
- ammonia supply pipeline is communicated to a multifuel burner of a hearth of a boiler of the thermal power plant, for taking part in the hearth burning as fuel, and/or into a SCR working surface of a flue gas cleaning denitration device at a rear gas flue of the boiler of the thermal power plant.
- the nitrogen source includes a space division device, a power input end of the space division device is connected to a power generation output end of the thermal power plant, so as to obtain the peak regulation balance electric quantity of the thermal power plant as a power supply, and a nitrogen output end is connected with a nitrogen inlet of the synthetic ammonia equipment.
- an oxygen output end of the electrolysis hydrogen making device is communicated with an oxygen storage tank; a hydrogen output end of the electrolysis hydrogen making device is connected to a hydrogen storage tank by an ultralow temperature liquefying device or a high pressure gas compression device, for outputting the hydrogen which is not input to the synthetic ammonia equipment in a state of ultralow temperature liquid hydrogen or high pressure compression gaseous hydrogen to the hydrogen storage tank.
- a hydrogen output end of the electrolysis hydrogen making device or the hydrogen storage tank is communicated to an external hydrogen transporting pipeline, and directly transports the hydrogen externally by the external hydrogen transporting pipeline.
- an oxygen output end of the space division device is communicated to an oxygen storage tank, and a nitrogen output end of the space division device is also communicated to the nitrogen storage tank, for outputting nitrogen which is not input to the synthetic ammonia equipment to the nitrogen storage tank.
- the electrolysis hydrogen making device is alkaline aqueous solution type, a solid polymer type or a high temperature solid oxide type.
- a water inlet of the electrolysis hydrogen making device is communicated with a chemical water treatment workshop of the thermal power plant by a make-up pump, and the chemical water treatment workshop of the thermal power plant is communicated with the make-up pump by a purified water preparing device.
- the present invention further provides a peak regulation and frequency modulation electrochemical plant, which has the above-mentioned synthetic ammonia system for making hydrogen by electrolysis in a thermal power plant, with a resultant product of one or more of electric power, thermal power, hydrogen, nitrogen, oxygen and ammonia, which is connected to the corresponding gas storage device by a gas purifying device respectively, so as to implement low temperature liquidation or high pressure storage of one or more of hydrogen, nitrogen, oxygen and ammonia.
- the production device for one or more of hydrogen, nitrogen, oxygen and ammonia is connected with the corresponding high pressure or low temperature liquefied petroleum gas cylinder bottling device by the gas purifying device, which may sell one or more of the gaseous products of hydrogen, nitrogen, oxygen and ammonia.
- the present invention has the beneficial effects that by the above-mentioned synthetic ammonia system for making hydrogen by electrolysis in a thermal power plant, which implements hydrogen and nitrogen making in the power plant by taking full advantage of peak regulation and frequency modulation power, then produces ammonia by the synthetic ammonia process using the resultant nitrogen and hydrogen, such that the thermal power plant turns into an electrochemical plant of various gas and fuel products (ammonia and hydrogen is taken as fuel to replace coal, and various gases such as hydrogen, nitrogen, ammonia and oxygen may be on sale and output). Especially, hydrogen and ammonia is taken as fuel with zero carbon emission, certainly with broad application prospects in the future.
- the synthetic ammonia system for making hydrogen by electrolysis in a thermal power plant acquires electric energy at a low ebb, converts its electric energy into hydrogen energy, and then performs synthetic ammonia process on hydrogen energy and nitrogen, thereby converting hydrogen energy into chemical energy of ammonia fuel easy to transport and store, which not only realize electric energy storage in disguised form, but also transform the traditional thermal power plant into an energy plant for producing various gaseous products.
- the synthetic ammonia system for making hydrogen by electrolysis in a thermal power plant may directly consume the peak regulation balance electric quantity of the power plant, indirectly uses wind, light, water and nuclear power curtailment, alleviates the problems of grid balance and peak and valley difference, prolongs the service life of the power plant equipment, implements the disguised storage of electricity energy, and realizes the stable storage of energy and effective usage.
- FIG. 1 is a structural schematic diagram of a first embodiment according to the present invention
- FIG. 2 is a structural schematic diagram of a second embodiment according to the present invention.
- FIG. 3 is a structural schematic diagram of a third embodiment according to the present invention.
- a synthetic ammonia system for making hydrogen by electrolysis in a thermal power plant includes an electrolytic hydrogen making device 1 and a synthetic ammonia equipment 2 ; a power input end of the electrolytic hydrogen making device 1 is electrically connected with a power generation output end of the thermal power plant; a hydrogen output end of the electrolysis hydrogen making device 1 is connected with a hydrogen inlet of the synthetic ammonia equipment 2 , a nitrogen inlet of the synthetic ammonia equipment 2 is connected with a nitrogen source; an ammonia output end of the synthetic ammonia equipment 2 is communicated to an ammonia supply pipeline and a liquid ammonia tank 12 of the thermal power plant.
- the ammonia supply pipeline may include an ammonia supply pipeline and a liquid ammonia supply pipeline.
- the above-mentioned synthetic ammonia system for making hydrogen by electrolysis in a thermal power plant has the following working principal.
- a grid control center sends a peak regulation load instruction to a power plant centralized control center of the thermal power plant according to a real-time power generation and peak regulation load requirement in a region, and the centralized control center of the thermal power plant controls and adjusts the peak regulation and frequency modulation balance electricity quantity of the thermal power plant according to the peak regulation load instruction.
- the peak regulation and frequency modulation balance electric quantity of the thermal power plant provides power supply for the electrolysis hydrogen making device, and the hydrogen made by the electrolysis hydrogen making device is transported to the synthetic ammonia equipment.
- the ammonia supply pipeline of the thermal power plant provides the ammonia to various systems needing ammonia of the thermal power plant.
- the extra ammonia may be stored in the liquid ammonia storage tank 12 , is liquefied at a low temperature to the liquid ammonia, and bottled to be on sale.
- the hydrogen prepared by the peak regulation and frequency modulation balance electric quantity of the thermal power plant may be used to synthesize into ammonia, thereby providing ammonia for various systems needing ammonia of the thermal power plant, and realizes cyclic utilization and transformation of energy.
- a power generation device of the thermal power plant is a thermal power generation unit, including an electric generator 101 , a steam turbine 102 , a condenser 103 , a low pressure heater 104 , a deaerator 105 , a high pressure heater 106 and a boiler 107 ; a power input end of the electrolysis hydrogen making device 1 is connected to a power output end of the electric generator 101 , and the electric generator 101 provides a power supply for the electrolysis hydrogen making device 1 using the peak regulation and frequency modulation balance electric quantity.
- ammonia supply pipeline is communicated to a multifuel burner 110 of a hearth of a boiler 107 of the thermal power plant, for taking part in the hearth burning as fuel, and/or into a SCR working surface 108 of a flue gas cleaning denitration device at a rear gas flue of the boiler of the thermal power plant.
- the ammonia enters the multifuel burner of the hearth of the boiler to be fuel and burnt in the hearth, partially replacing coal, which may reduce the boiler coal amount and CO 2 emission load.
- the liquid ammonia leads to the SCR working surface of a flue gas cleaning denitration device, and performs ammonia spraying process on the SCR working surface.
- the liquid ammonia supply pipeline firstly leads to the ammonia spraying device 109 , and to the SCR working surface by the ammonia spraying device.
- the nitrogen in the nitrogen source may be directly purchased on the market.
- the nitrogen source includes a space division device 3 , and a power input end of the space division device 3 is connected to a power generation output end (the electric generator 101 in the present embodiment) of the thermal power plant, and a nitrogen output end is connected with a nitrogen inlet of the synthetic ammonia equipment 2 .
- the space division device 3 is used to make nitrogen, by taking the peak regulation and frequency modulation balance electric quantity of the thermal power plant as the electric energy source, which may save the cost of purchasing nitrogen on the market, further taking full advantage of the balance electric quantity of the thermal power plant, and improving energy utilization rate.
- a copious cooling space division nitrogen making device, a pressure swing adsorption space division device or a film separation space division device may be used.
- an oxygen output end of the electrolysis hydrogen making device 1 is communicated with one oxygen storing tank 4 . Further, the oxygen output end of the space division device 3 is also connected to the above-mentioned oxygen storing tank 4 .
- the oxygen generated during the hydrogen and nitrogen making process is stored in the oxygen storage tank, is on sale after bottled, and may also provide oxygen for the boiler burning.
- a hydrogen output end of the electrolysis hydrogen making device 1 is also connected to a hydrogen storage tank 5 by an ultralow temperature liquefying device or a high pressure gas compression device, for outputting the hydrogen which is not input to the synthetic ammonia equipment in a state of ultralow temperature liquid hydrogen or high pressure compression gaseous hydrogen to the hydrogen storage tank 5 .
- the hydrogen not used for preparing ammonia immediately during the hydrogen making may be firstly stored in the hydrogen storage tank 5 , which not only provides fuel for the boiler burning, but also may be on sale, providing hydrogen for the subsequent ammonia preparation.
- a hydrogen output end of the electrolysis hydrogen making device or a hydrogen storage tank may also be communicated to an external hydrogen transporting pipeline, and directly transports the hydrogen externally by the external hydrogen transporting pipeline.
- the electrolysis hydrogen making device 1 and the space division device 3 may introduce hydrogen and nitrogen to the synthetic ammonia equipment 2 through a flow valve respectively.
- the flow valve may introduce hydrogen and nitrogen into the synthetic ammonia equipment according to a preset ratio of hydrogen to nitrogen, which not only ensures effects of making ammonia, but also not wastes hydrogen and nitrogen.
- a nitrogen output end of the space division device 3 is also communicated to a nitrogen storage tank 6 , for outputting nitrogen which is not input to the synthetic ammonia equipment to the nitrogen storage tank 6 .
- the hydrogen not used for preparing ammonia immediately during the hydrogen making may be firstly stored in the nitrogen storage tank 6 , which may not only be bottled to be on sale, but also provide nitrogen for the subsequent ammonia preparation.
- the electrolysis hydrogen making device 1 may be an alkaline aqueous solution type, a solid polymer type or a high temperature solid oxide type.
- a water inlet of the electrolysis hydrogen making device 1 is communicated with a chemical water treatment workshop 8 by a make-up pump 7
- the chemical water treatment workshop 8 of the thermal power plant is communicated with the make-up pump 7 by a purified water preparing device 9 .
- the electric generation output end of the thermal power plant (the output end of the electric generator 101 in the present embodiment) is electrically connected to a power supply input end of the electrolysis hydrogen making device 1 through an inverter 10 , and the generator output end of the thermal power plant is also electrically connected with the power supply input end of the space division device 3 through another inverter 11 .
- the synthetic ammonia equipment 2 may be communicated with the ammonia supply pipeline through the ammonia flow control valve.
- a grid control center sends a peak regulation load instruction to a power plant centralized control center of the thermal power plant according to a real-time power generation and peak regulation load requirement in a region, and the centralized control center of the thermal power plant controls and adjusts the peak regulation and frequency modulation balance electricity quantity of the thermal power plant according to the peak regulation load instruction.
- the peak regulation and frequency modulation balance electric quantity of the thermal power plant provides power supply for the electrolysis hydrogen making device 1 by the electric generation device of the thermal power plant, and the hydrogen made by the electrolysis hydrogen making device is transported to the synthetic ammonia equipment 2 .
- the nitrogen is made by the space division device 3 , a power input end of the space division device 3 is connected to a power generation output end (the output end of the electric generator 101 in the present embodiment) of the thermal power plant, and a nitrogen output end is connected with a nitrogen inlet of the synthetic ammonia equipment 2 .
- the electric generation device may provide a power supply for the space division device 3 using balance electric quantity.
- ammonia is made at a high temperature and a high pressure, and is provided to various systems needing ammonia of the thermal power plant by the ammonia supply pipeline of the thermal power plant.
- the liquid ammonia enters the hearth of the boiler 107 to be fuel and burnt in the hearth, partially replacing coal, which may reduce the boiler coal amount and CO 2 emission load.
- the liquid ammonia leads to the ammonia spraying device 109 , and is sprayed into the SCR working surface of a flue gas cleaning denitration device, performing ammonia spraying process on the SCR working surface.
- the extra hydrogen and the resultant oxygen in the electrolysis hydrogen making device 1 lead to the multifuel burner 110 of the hearth of the boiler 107 for supporting and stabilizing combustion.
- the oxygen realizes oxygen-enriched combustion of the boiler.
- the chemical water treatment workshop 8 of the thermal power plant leads the treated chemical water to the purified water preparation device 9 .
- the make-up pump pumps the purified water to the electrolysis hydrogen making device as raw water.
- various gaseous products prepared by the power plant are all used for the power plant system, without external sales.
- the constitution of the present embodiment is substantially the same as that in the first embodiment, with the main difference in that in the present embodiment, there is no space division device, all nitrogen may be purchased directly externally, and the oxygen is generated from the electrolysis hydrogen making device.
- Other constitutions and functions as well as final products of the system are substantially the same as those in the first embodiment.
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Abstract
Description
- The present application claims the benefit of priority to Chinese patent application No. 201810922444.9, titled “ SYNTHETIC AMMONIA SYSTEM FOR MAKING HYDROGEN BY ELECTROLYSIS IN THERMAL POWER PLANT”, filed with the Chinese State Intellectual Property Office on Aug. 14, 2018, the entire disclosure of which is incorporated herein by reference.
- The present invention relates to the field of electrical energy and synthetic ammonia technologies, and in particular to a synthetic ammonia system for making hydrogen by electrolysis in a thermal power plant.
- At the present stage, in Chinese electrical power systems, there is an abundant electricity production capacity but a lack of a peak regulation power supply such as a gas turbine and pumped storage, so the obvious contradiction occurs between grid peak regulation and thermal power generating unit flexibility, and the ability of grid consuming wind electricity, photoelectricity, hydropower and nuclear power is insufficient.
- In a related art, the peak regulation in the thermal power plant has been a salient contradiction in the grid operation. Currently, the Chinese thermal power flexibility peak regulation transformation is targeted at heat supply units in winter. However, how to adjust a peak in summer is a problem many thermal power plants facing. In order to meet the requirement of grid peak regulation, reduce the energy waste during the peak regulation to maximum extent, and make the power plants survive in fierce competition, the deep reformation of peak regulation should be performed.
- On the other hand, carbon emission reduction would exert increasing pressure on the thermal power plant. In order to solve the problems of wind and light curtailment, thermal power flexibility peak regulation and carbon emission reduction, it is necessary for thermal power units to solve these problems.
- As a most promising hydrogen making technology on a big scale, the electrolytic hydrogen making is efficient and clean, with a simple process and high product purity up to 99.9% (hydrogen and oxygen). Especially, with the increase in the clean power generation, hydrogen will become an ideal carrier for storing electric energy. By implementing the clean power generation and applying the water-electrolytic hydrogen making technology, the electric energy generated by the clean energy is converted into hydrogen energy to be stored, or as needed, the hydrogen energy is converted into methane, methyl alcohol and other liquid fuel by the subsequent chemical process.
- Ammonia is a very important chemical product for human. With the social development and progress in industrial civilization, a synthetic ammonia product has obvious contributions to human. As hydrogen storage fuel which is transported conveniently, many research units and energy companies think that ammonia is promising. Ammonia may be liquefied at a temperature of 20 degrees centigrade below zero, and thus may be transported conveniently with low costs; in addition, ammonia is also a fuel and refrigerant, not only for burning, but also for cooling. Currently, ammonia is mainly used for a SCR denitration system.
- In view of defects in the related art, the present invention is directed to providing a synthetic ammonia system for making hydrogen by electrolysis in a thermal power plant, which implements electrolytic hydrogen making and space division nitrogen and oxygen making by using peak regulation and frequency modulation power, then produces ammonia by the synthetic ammonia process using the resultant nitrogen and hydrogen, such that the power plant turns into an electrochemical plant of various gas and fuel products.
- In order to realize the above purpose, the present invention utilizes the following technical solutions.
- A synthetic ammonia system for making hydrogen by electrolysis in a thermal power plant includes an electrolytic hydrogen making device and a synthetic ammonia equipment; a power input end of the electrolytic hydrogen making device is electrically connected with a power generation output end of the thermal power plant, so as to use peak regulation balance electric quantity of the thermal power plant to produce hydrogen and oxygen for power supply electrolysis; a hydrogen output end of the electrolysis hydrogen making device is connected with a hydrogen inlet of the synthetic ammonia equipment, a nitrogen inlet of the synthetic ammonia equipment is connected with a nitrogen source, the synthetic ammonia equipment is used for using the hydrogen produced by the electrolysis hydrogen making device and nitrogen of the nitrogen source to synthesize ammonia; an ammonia output end of the synthetic ammonia equipment is communicated to an ammonia supply pipeline and/or a liquid ammonia tank of the thermal power plant.
- Further, the ammonia supply pipeline is communicated to a multifuel burner of a hearth of a boiler of the thermal power plant, for taking part in the hearth burning as fuel, and/or into a SCR working surface of a flue gas cleaning denitration device at a rear gas flue of the boiler of the thermal power plant.
- Further, the nitrogen source includes a space division device, a power input end of the space division device is connected to a power generation output end of the thermal power plant, so as to obtain the peak regulation balance electric quantity of the thermal power plant as a power supply, and a nitrogen output end is connected with a nitrogen inlet of the synthetic ammonia equipment.
- Further, an oxygen output end of the electrolysis hydrogen making device is communicated with an oxygen storage tank; a hydrogen output end of the electrolysis hydrogen making device is connected to a hydrogen storage tank by an ultralow temperature liquefying device or a high pressure gas compression device, for outputting the hydrogen which is not input to the synthetic ammonia equipment in a state of ultralow temperature liquid hydrogen or high pressure compression gaseous hydrogen to the hydrogen storage tank.
- Further, a hydrogen output end of the electrolysis hydrogen making device or the hydrogen storage tank is communicated to an external hydrogen transporting pipeline, and directly transports the hydrogen externally by the external hydrogen transporting pipeline.
- Further, an oxygen output end of the space division device is communicated to an oxygen storage tank, and a nitrogen output end of the space division device is also communicated to the nitrogen storage tank, for outputting nitrogen which is not input to the synthetic ammonia equipment to the nitrogen storage tank.
- Further, the electrolysis hydrogen making device is alkaline aqueous solution type, a solid polymer type or a high temperature solid oxide type.
- Further, a water inlet of the electrolysis hydrogen making device is communicated with a chemical water treatment workshop of the thermal power plant by a make-up pump, and the chemical water treatment workshop of the thermal power plant is communicated with the make-up pump by a purified water preparing device.
- The present invention further provides a peak regulation and frequency modulation electrochemical plant, which has the above-mentioned synthetic ammonia system for making hydrogen by electrolysis in a thermal power plant, with a resultant product of one or more of electric power, thermal power, hydrogen, nitrogen, oxygen and ammonia, which is connected to the corresponding gas storage device by a gas purifying device respectively, so as to implement low temperature liquidation or high pressure storage of one or more of hydrogen, nitrogen, oxygen and ammonia.
- Further, the production device for one or more of hydrogen, nitrogen, oxygen and ammonia is connected with the corresponding high pressure or low temperature liquefied petroleum gas cylinder bottling device by the gas purifying device, which may sell one or more of the gaseous products of hydrogen, nitrogen, oxygen and ammonia.
- The present invention has the beneficial effects that by the above-mentioned synthetic ammonia system for making hydrogen by electrolysis in a thermal power plant, which implements hydrogen and nitrogen making in the power plant by taking full advantage of peak regulation and frequency modulation power, then produces ammonia by the synthetic ammonia process using the resultant nitrogen and hydrogen, such that the thermal power plant turns into an electrochemical plant of various gas and fuel products (ammonia and hydrogen is taken as fuel to replace coal, and various gases such as hydrogen, nitrogen, ammonia and oxygen may be on sale and output). Especially, hydrogen and ammonia is taken as fuel with zero carbon emission, certainly with broad application prospects in the future.
- The synthetic ammonia system for making hydrogen by electrolysis in a thermal power plant according to the present invention acquires electric energy at a low ebb, converts its electric energy into hydrogen energy, and then performs synthetic ammonia process on hydrogen energy and nitrogen, thereby converting hydrogen energy into chemical energy of ammonia fuel easy to transport and store, which not only realize electric energy storage in disguised form, but also transform the traditional thermal power plant into an energy plant for producing various gaseous products.
- In addition, the synthetic ammonia system for making hydrogen by electrolysis in a thermal power plant according to the present invention may directly consume the peak regulation balance electric quantity of the power plant, indirectly uses wind, light, water and nuclear power curtailment, alleviates the problems of grid balance and peak and valley difference, prolongs the service life of the power plant equipment, implements the disguised storage of electricity energy, and realizes the stable storage of energy and effective usage.
-
FIG. 1 is a structural schematic diagram of a first embodiment according to the present invention; -
FIG. 2 is a structural schematic diagram of a second embodiment according to the present invention; and -
FIG. 3 is a structural schematic diagram of a third embodiment according to the present invention. - The present invention will be further described in combination with drawings. It should be noted that the embodiment provides detailed implementation modes and specific operation process by taking the present technical solution as a premise. However, the protection scope of the present invention is not limited the present embodiment.
- As shown in
FIG. 1 , a synthetic ammonia system for making hydrogen by electrolysis in a thermal power plant includes an electrolytichydrogen making device 1 and asynthetic ammonia equipment 2; a power input end of the electrolytichydrogen making device 1 is electrically connected with a power generation output end of the thermal power plant; a hydrogen output end of the electrolysishydrogen making device 1 is connected with a hydrogen inlet of thesynthetic ammonia equipment 2, a nitrogen inlet of thesynthetic ammonia equipment 2 is connected with a nitrogen source; an ammonia output end of thesynthetic ammonia equipment 2 is communicated to an ammonia supply pipeline and aliquid ammonia tank 12 of the thermal power plant. The ammonia supply pipeline may include an ammonia supply pipeline and a liquid ammonia supply pipeline. - The above-mentioned synthetic ammonia system for making hydrogen by electrolysis in a thermal power plant has the following working principal. Usually, a grid control center sends a peak regulation load instruction to a power plant centralized control center of the thermal power plant according to a real-time power generation and peak regulation load requirement in a region, and the centralized control center of the thermal power plant controls and adjusts the peak regulation and frequency modulation balance electricity quantity of the thermal power plant according to the peak regulation load instruction. In the above-mentioned synthetic ammonia system for making hydrogen by electrolysis in a thermal power plant, the peak regulation and frequency modulation balance electric quantity of the thermal power plant provides power supply for the electrolysis hydrogen making device, and the hydrogen made by the electrolysis hydrogen making device is transported to the synthetic ammonia equipment. After the synthetic ammonia equipment obtains hydrogen from the electrolysis hydrogen making device and nitrogen from a nitrogen source, and makes ammonia at a high temperature and a high pressure, the ammonia supply pipeline of the thermal power plant provides the ammonia to various systems needing ammonia of the thermal power plant. The extra ammonia may be stored in the liquid
ammonia storage tank 12, is liquefied at a low temperature to the liquid ammonia, and bottled to be on sale. - With the above-mentioned synthetic ammonia system for making hydrogen by electrolysis in a thermal power plant, the hydrogen prepared by the peak regulation and frequency modulation balance electric quantity of the thermal power plant may be used to synthesize into ammonia, thereby providing ammonia for various systems needing ammonia of the thermal power plant, and realizes cyclic utilization and transformation of energy.
- Usually, a power generation device of the thermal power plant is a thermal power generation unit, including an
electric generator 101, asteam turbine 102, acondenser 103, alow pressure heater 104, adeaerator 105, ahigh pressure heater 106 and aboiler 107; a power input end of the electrolysishydrogen making device 1 is connected to a power output end of theelectric generator 101, and theelectric generator 101 provides a power supply for the electrolysishydrogen making device 1 using the peak regulation and frequency modulation balance electric quantity. - Further, the ammonia supply pipeline is communicated to a
multifuel burner 110 of a hearth of aboiler 107 of the thermal power plant, for taking part in the hearth burning as fuel, and/or into aSCR working surface 108 of a flue gas cleaning denitration device at a rear gas flue of the boiler of the thermal power plant. - The ammonia enters the multifuel burner of the hearth of the boiler to be fuel and burnt in the hearth, partially replacing coal, which may reduce the boiler coal amount and CO2 emission load. The liquid ammonia leads to the SCR working surface of a flue gas cleaning denitration device, and performs ammonia spraying process on the SCR working surface. In the present embodiment, the liquid ammonia supply pipeline firstly leads to the
ammonia spraying device 109, and to the SCR working surface by the ammonia spraying device. - The nitrogen in the nitrogen source may be directly purchased on the market. In the present embodiment, the nitrogen source includes a
space division device 3, and a power input end of thespace division device 3 is connected to a power generation output end (theelectric generator 101 in the present embodiment) of the thermal power plant, and a nitrogen output end is connected with a nitrogen inlet of thesynthetic ammonia equipment 2. - The
space division device 3 is used to make nitrogen, by taking the peak regulation and frequency modulation balance electric quantity of the thermal power plant as the electric energy source, which may save the cost of purchasing nitrogen on the market, further taking full advantage of the balance electric quantity of the thermal power plant, and improving energy utilization rate. In practical applications, a copious cooling space division nitrogen making device, a pressure swing adsorption space division device or a film separation space division device may be used. - Further, an oxygen output end of the electrolysis
hydrogen making device 1 is communicated with oneoxygen storing tank 4. Further, the oxygen output end of thespace division device 3 is also connected to the above-mentionedoxygen storing tank 4. The oxygen generated during the hydrogen and nitrogen making process is stored in the oxygen storage tank, is on sale after bottled, and may also provide oxygen for the boiler burning. - A hydrogen output end of the electrolysis
hydrogen making device 1 is also connected to ahydrogen storage tank 5 by an ultralow temperature liquefying device or a high pressure gas compression device, for outputting the hydrogen which is not input to the synthetic ammonia equipment in a state of ultralow temperature liquid hydrogen or high pressure compression gaseous hydrogen to thehydrogen storage tank 5. The hydrogen not used for preparing ammonia immediately during the hydrogen making may be firstly stored in thehydrogen storage tank 5, which not only provides fuel for the boiler burning, but also may be on sale, providing hydrogen for the subsequent ammonia preparation. - Further, a hydrogen output end of the electrolysis hydrogen making device or a hydrogen storage tank may also be communicated to an external hydrogen transporting pipeline, and directly transports the hydrogen externally by the external hydrogen transporting pipeline.
- The electrolysis
hydrogen making device 1 and thespace division device 3 may introduce hydrogen and nitrogen to thesynthetic ammonia equipment 2 through a flow valve respectively. The flow valve may introduce hydrogen and nitrogen into the synthetic ammonia equipment according to a preset ratio of hydrogen to nitrogen, which not only ensures effects of making ammonia, but also not wastes hydrogen and nitrogen. - Further, a nitrogen output end of the
space division device 3 is also communicated to anitrogen storage tank 6, for outputting nitrogen which is not input to the synthetic ammonia equipment to thenitrogen storage tank 6. Similarly, the hydrogen not used for preparing ammonia immediately during the hydrogen making may be firstly stored in thenitrogen storage tank 6, which may not only be bottled to be on sale, but also provide nitrogen for the subsequent ammonia preparation. - Further, the electrolysis
hydrogen making device 1 may be an alkaline aqueous solution type, a solid polymer type or a high temperature solid oxide type. - Further, a water inlet of the electrolysis
hydrogen making device 1 is communicated with a chemicalwater treatment workshop 8 by a make-uppump 7, and the chemicalwater treatment workshop 8 of the thermal power plant is communicated with the make-uppump 7 by a purifiedwater preparing device 9. - Further, the electric generation output end of the thermal power plant (the output end of the
electric generator 101 in the present embodiment) is electrically connected to a power supply input end of the electrolysishydrogen making device 1 through aninverter 10, and the generator output end of the thermal power plant is also electrically connected with the power supply input end of thespace division device 3 through anotherinverter 11. - The
synthetic ammonia equipment 2 may be communicated with the ammonia supply pipeline through the ammonia flow control valve. - As shown in
FIG. 2 , in the present embodiment, a grid control center sends a peak regulation load instruction to a power plant centralized control center of the thermal power plant according to a real-time power generation and peak regulation load requirement in a region, and the centralized control center of the thermal power plant controls and adjusts the peak regulation and frequency modulation balance electricity quantity of the thermal power plant according to the peak regulation load instruction. The peak regulation and frequency modulation balance electric quantity of the thermal power plant provides power supply for the electrolysishydrogen making device 1 by the electric generation device of the thermal power plant, and the hydrogen made by the electrolysis hydrogen making device is transported to thesynthetic ammonia equipment 2. - The nitrogen is made by the
space division device 3, a power input end of thespace division device 3 is connected to a power generation output end (the output end of theelectric generator 101 in the present embodiment) of the thermal power plant, and a nitrogen output end is connected with a nitrogen inlet of thesynthetic ammonia equipment 2. The electric generation device may provide a power supply for thespace division device 3 using balance electric quantity. - After the synthetic ammonia equipment obtains hydrogen from the electrolysis hydrogen making device and nitrogen from a nitrogen source, ammonia is made at a high temperature and a high pressure, and is provided to various systems needing ammonia of the thermal power plant by the ammonia supply pipeline of the thermal power plant.
- The liquid ammonia enters the hearth of the
boiler 107 to be fuel and burnt in the hearth, partially replacing coal, which may reduce the boiler coal amount and CO2 emission load. In addition, the liquid ammonia leads to theammonia spraying device 109, and is sprayed into the SCR working surface of a flue gas cleaning denitration device, performing ammonia spraying process on the SCR working surface. - In the present embodiment, the extra hydrogen and the resultant oxygen in the electrolysis
hydrogen making device 1 lead to themultifuel burner 110 of the hearth of theboiler 107 for supporting and stabilizing combustion. The oxygen realizes oxygen-enriched combustion of the boiler. - The chemical
water treatment workshop 8 of the thermal power plant leads the treated chemical water to the purifiedwater preparation device 9. After the purifiedwater preparation device 9 makes purified water, the make-up pump pumps the purified water to the electrolysis hydrogen making device as raw water. - In the present embodiment, various gaseous products prepared by the power plant are all used for the power plant system, without external sales.
- As shown in
FIG. 3 , the constitution of the present embodiment is substantially the same as that in the first embodiment, with the main difference in that in the present embodiment, there is no space division device, all nitrogen may be purchased directly externally, and the oxygen is generated from the electrolysis hydrogen making device. Other constitutions and functions as well as final products of the system are substantially the same as those in the first embodiment. - According to the above-mentioned technical solution and conception, persons skilled in the art make various changes and alternations which should fall within the protection scope of the claims of the present invention.
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CN201810922444.9 | 2018-08-14 |
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