CN117526438A - Polygeneration system suitable for Sha Ge barren region energy base - Google Patents
Polygeneration system suitable for Sha Ge barren region energy base Download PDFInfo
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- CN117526438A CN117526438A CN202311457299.9A CN202311457299A CN117526438A CN 117526438 A CN117526438 A CN 117526438A CN 202311457299 A CN202311457299 A CN 202311457299A CN 117526438 A CN117526438 A CN 117526438A
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 185
- 239000001257 hydrogen Substances 0.000 claims abstract description 100
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 100
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 97
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 70
- 238000004519 manufacturing process Methods 0.000 claims abstract description 67
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 61
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 60
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 39
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 30
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000010248 power generation Methods 0.000 claims abstract description 25
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000003546 flue gas Substances 0.000 claims abstract description 15
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 13
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 13
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 114
- 229910021529 ammonia Inorganic materials 0.000 claims description 55
- 239000007789 gas Substances 0.000 claims description 32
- 238000010521 absorption reaction Methods 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 17
- 238000003795 desorption Methods 0.000 claims description 15
- 238000000926 separation method Methods 0.000 claims description 15
- 239000002912 waste gas Substances 0.000 claims description 6
- 239000002699 waste material Substances 0.000 claims 3
- 238000000034 method Methods 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 7
- 230000005611 electricity Effects 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000000446 fuel Substances 0.000 description 6
- 238000003860 storage Methods 0.000 description 6
- 239000002803 fossil fuel Substances 0.000 description 5
- 150000002431 hydrogen Chemical class 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000000376 reactant Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000005261 decarburization Methods 0.000 description 3
- 230000029087 digestion Effects 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000001308 synthesis method Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 230000035425 carbon utilization Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000002194 synthesizing effect Effects 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000007701 flash-distillation Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000013082 photovoltaic technology Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011949 solid catalyst Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
Classifications
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- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
-
- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
-
- 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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
-
- 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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention provides a poly-generation system suitable for an energy base in Sha Ge barren regions, which belongs to low-carbon energy-saving and emission-reducing, and comprises: the renewable energy source power generation subsystem is connected with the power grid, and is used for generating power by using renewable energy sources and supplying power to the power grid; the water electrolysis hydrogen production subsystem is connected with the renewable energy power generation subsystem and is used for producing hydrogen based on the electric power generated by the renewable energy power generation subsystem; the thermal power unit carbon capture subsystem is used for decarburizing the flue gas of the thermal power plant and capturing carbon dioxide; the methanol synthesis subsystem is respectively connected with the water electrolysis hydrogen production subsystem and the thermal power unit carbon capture subsystem and is used for preparing methanol based on hydrogen prepared by the water electrolysis hydrogen production subsystem and carbon dioxide captured by the thermal power unit carbon capture subsystem. The invention reduces the wind and light discarding phenomenon of the power grid and improves the utilization rate of renewable energy sources.
Description
Technical Field
The invention relates to the field of low-carbon energy conservation and emission reduction, in particular to a polygeneration system suitable for an energy base in a Sha Ge barren region.
Background
Sha Ge barren areas have rich renewable resources, however, the supply of renewable resources such as wind and light has intermittence and strong fluctuation, so that the wind and light discarding phenomenon of the power grid is serious. In the last decades, fossil energy and some non-renewable energy produced environmental pollution and CO during the process of use 2 The emission problem is increasingly serious, and energy utilization modes of low carbon, energy conservation and emission reduction have attracted wide attention.
The green hydrogen energy prepared by the renewable power can improve the utilization level of a renewable energy system, however, the storage and transportation of hydrogen has a certain risk, and the carbon capture of a conventional thermal power plant is affected by CO 2 In the prior art, renewable energy power generation is generally transmitted to electricity users through a power grid, and due to the intermittence and strong fluctuation of wind and light supply, the phenomenon of wind and light abandoning often exists, and even if redundant power is stored by taking hydrogen as a carrier, potential safety hazards exist in the storage and utilization of the hydrogen. In addition, captured CO of thermal power plant 2 The method is often used for geological storage and oil displacement, and the economic benefit brought by the method can not compensate for the additional cost brought by carbon capture equipment investment, operation and maintenance.
Disclosure of Invention
The invention aims to provide a poly-generation system suitable for an energy base in a Sha Ge barren area, which can reduce the wind and light discarding phenomenon of a power grid and improve the utilization rate of renewable energy sources.
In order to achieve the above object, the present invention provides the following solutions:
a polygeneration system suitable for use in an energy base of a Sha Ge barren region, comprising:
the renewable energy source power generation subsystem is connected with a power grid, and is used for generating power by using renewable energy sources and supplying power to the power grid;
the water electrolysis hydrogen production subsystem is connected with the renewable energy power generation subsystem and is used for preparing hydrogen based on the electric power generated by the renewable energy power generation subsystem;
the thermal power unit carbon capture subsystem is used for decarburizing the flue gas of the thermal power plant and capturing carbon dioxide;
and the methanol synthesis subsystem is respectively connected with the water electrolysis hydrogen production subsystem and the thermal power unit carbon capture subsystem and is used for preparing methanol based on hydrogen prepared by the water electrolysis hydrogen production subsystem and carbon dioxide captured by the thermal power unit carbon capture subsystem.
Optionally, the water electrolysis hydrogen production subsystem comprises: an electrolytic water hydrogen production device, a first cooler and a first compressor;
the inlet of the electrolytic water hydrogen production device is filled with water and is connected with the renewable energy power generation subsystem; the hydrogen outlet of the electrolytic water hydrogen production device, the first cooler and the inlet of the first compressor are sequentially connected; the outlet of the first compressor is connected with the methanol synthesis subsystem.
Optionally, the thermal power generating unit carbon capture subsystem includes: the system comprises a thermal power plant, a second compressor, an absorption tower, a rich liquid pump, a second cooler, a heat exchanger, a desorption tower, a lean liquid pump, a third cooler and a third compressor;
the flue gas outlet of the thermal power plant, the second compressor and the flue gas inlet of the absorption tower are sequentially connected;
the rich solution outlet of the absorption tower, the rich solution pump, the heat exchanger and the inlet of the desorption tower are sequentially connected;
the lean liquid outlet of the desorption tower, the lean liquid pump, the heat exchanger, the second cooler and the lean liquid inlet of the absorption tower are sequentially connected;
the carbon dioxide outlet of the desorption tower, the third cooler and the inlet of the third compressor are sequentially connected; the outlet of the third compressor is connected with the methanol synthesis subsystem.
Optionally, the methanol synthesis subsystem comprises: the device comprises a first mixer, a methanol synthesis tower, a fourth cooler, a flash evaporator, a rectifying tower, a separator and a second mixer;
the inlet of the first mixer is respectively connected with the electrolytic water hydrogen production subsystem and the thermal power unit carbon capture subsystem;
the outlet of the first mixer, the methanol synthesis tower, the fourth cooler and the inlet of the flash evaporator are sequentially connected;
the non-condensable gas outlet of the flash evaporator is connected with the inlet of the separator so as to separate the non-condensable gas and obtain circulating tail gas and waste gas;
the circulating tail gas outlet of the separator is connected with the inlet of the first mixer;
the exhaust gas outlet of the separator is connected with the inlet of the second mixer;
the crude methanol outlet of the flash evaporator is connected with the inlet of the rectifying tower;
the waste gas outlet of the rectifying tower is connected with the inlet of the second mixer;
and a methanol outlet of the rectifying tower outputs methanol.
Optionally, the polygeneration system applicable to the energy resource base of the Sha Ge barren region further comprises:
the ammonia synthesis subsystem is connected with the water electrolysis hydrogen production subsystem and is used for producing ammonia by utilizing the hydrogen prepared by the water electrolysis hydrogen production subsystem.
Optionally, the ammonia synthesis subsystem is a green haber ammonia synthesis system.
Optionally, the ammonia synthesis subsystem comprises: an air separation device, a fourth compressor, a third mixer, an ammonia synthesis tower and a condenser;
the inlet of the air separation device is filled with air and is connected with the water electrolysis hydrogen production subsystem;
the outlet of the air separation device, the fourth compressor, the third mixer, the ammonia synthesis tower and the inlet of the condenser are sequentially connected;
the ammonia gas outlet of the condenser outputs ammonia gas;
the non-condensable gas outlet of the condenser is connected with the inlet of the third mixer;
the inlet of the third mixer is also connected with the hydrogen production subsystem through water electrolysis. According to the specific embodiment provided by the invention, the invention discloses the following technical effects: according to the invention, the renewable energy power generation subsystem, the electrolyzed water hydrogen production subsystem, the thermal power unit carbon capture subsystem and the methanol synthesis subsystem are integrated, under the condition that wind and light output and electricity demand of users regularly fluctuate, the phenomena of wind abandon and light abandon in Sha Ge barren areas can be effectively overcome, the carbon dioxide captured by the thermal power unit carbon capture subsystem and the hydrogen prepared by the electrolyzed water hydrogen production subsystem are used as reactants to prepare methanol, the fuel convenient for storage and transportation is used for replacing the methanol, the development and utilization of the hydrogen are realized, the carbon utilization is realized while the decarburization is carried out on a thermal power plant, the dependence of a conventional methanol synthesis method on fossil fuels is reduced by the prepared methanol, and the utilization rate of renewable energy sources is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a polygeneration system suitable for an energy base in a Sha Ge barren region.
Symbol description: 1-renewable energy power generation subsystem, 2-electric network, 3-electrolyzed water hydrogen production subsystem, 31-electrolyzed water hydrogen production device, 32-first cooler, 33-first compressor, 4-thermal power unit carbon capture subsystem, 40-thermal power plant, 41-second compressor, 42-absorption tower, 43-rich liquor pump, 44-second cooler, 45-heat exchanger, 46-desorption tower, 47-lean liquor pump, 48-third cooler, 49-third compressor, 5-methanol synthesis subsystem, 51-first mixer, 52-methanol synthesis tower, 53-fourth cooler, 54-flash evaporator, 55-rectifying tower, 56-separator, 57-second mixer, 6-ammonia synthesis subsystem, 61-air separation device, 62-fourth compressor, 63-third mixer, 64-ammonia synthesis tower, 65-condenser.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a poly-generation system suitable for an energy base in a Sha Ge barren region, which combines the hydrogen production of renewable resources in the Sha Ge barren region with the decarburization recycling of a thermal power generating unit to generate useful fuel substitutes and electric power, thereby reducing the dependence on fossil fuel, reducing the energy cost, relieving the environmental pressure and reducing CO 2 Effect of discharge.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1, the polygeneration system applicable to the energy resource base in the Sha Ge barren region provided by the invention comprises: the system comprises a renewable energy power generation subsystem 1, a water electrolysis hydrogen production subsystem 3, a thermal power generating unit carbon capture subsystem 4 and a methanol synthesis subsystem 5.
The renewable energy power generation subsystem 1 is connected with the power grid 2, and the renewable energy power generation subsystem 1 is used for generating power by using renewable energy and supplying power to the power grid 2.
The water electrolysis hydrogen production subsystem 3 is connected with the renewable energy power generation subsystem 1, and the water electrolysis hydrogen production subsystem 3 is used for preparing hydrogen based on the electric power generated by the renewable energy power generation subsystem 1.
Specifically, the electrolytic water hydrogen production subsystem 3 includes: an electrolyzed water hydrogen production apparatus 31, a first cooler 32 and a first compressor 33.
The inlet of the electrolytic water hydrogen production device 31 is filled with water and is connected with the renewable energy power generation subsystem 1. The hydrogen outlet of the electrolyzed water hydrogen production apparatus 31, the first cooler 32, and the inlet of the first compressor 33 are sequentially connected. The outlet of the first compressor 33 is connected to the methanol synthesis subsystem 5.
The outlet of the renewable energy power generation subsystem 1 is connected with the inlet of the power grid 2, and the redundant power generated by the renewable energy power generation subsystem 1 is connected with the inlet of the water electrolysis hydrogen production device 31. The redundant power generated by the renewable energy power generation subsystem 1 is supplied to the electrolyzed water hydrogen production device 31 to prepare hydrogen, the phenomena of wind abandon and light abandon are reduced, the hydrogen prepared by the electrolyzed water hydrogen production device 31 is cooled by the first cooler 32, enters the first compressor 33 to be compressed to reach the reaction condition, and then enters the methanol synthesis subsystem 5 as a reactant.
The thermal power plant carbon capture subsystem 4 is used for decarbonizing the flue gas of the thermal power plant 40 and capturing carbon dioxide.
The carbon capture subsystem 4 of the thermal power unit realizes decarburization treatment on the flue gas of the thermal power unit, and captured high-purity CO 2 The methanol is prepared by reacting the reactant entering the methanol synthesis subsystem 5 with hydrogen, and the fuel which is convenient to store and transport is used for replacing the methanol, so that the development and the utilization of the hydrogen are realized, and meanwhile, the dependence of the conventional methanol synthesis method on fossil fuel is reduced by the methanol prepared by the method.
Specifically, the thermal power generating unit carbon capture subsystem 4 includes: the thermal power plant 40, the second compressor 41, the absorption tower 42, the rich liquid pump 43, the second cooler 44, the heat exchanger 45, the desorption tower 46, the lean liquid pump 47, the third cooler 48, and the third compressor 49.
The flue gas outlet of the thermal power plant 40, the second compressor 41 and the flue gas inlet of the absorption tower 42 are sequentially connected.
The rich solution outlet of the absorption column 42, the rich solution pump 43, the heat exchanger 45, and the inlet of the desorption column 46 are connected in this order.
The lean liquid outlet of the desorption column 46, the lean liquid pump 47, the heat exchanger 45, the second cooler 44, and the lean liquid inlet of the absorption column 42 are connected in this order. Wherein the outlet of the lean liquid pump 47 is connected to the heat source inlet of the heat exchanger 45, and the heat source outlet of the heat exchanger 45 is connected to the inlet of the second cooler 44.
The carbon dioxide outlet of the desorption column 46, the third cooler 48, and the inlet of the third compressor 49 are connected in this order. The outlet of the third compressor 49 is connected to the methanol synthesis subsystem 5.
The flue gas of the thermal power plant 40 is pressurized to a proper pressure by the second compressor 41 and then is sent to the absorption tower 42, so that carbon emission reduction of the thermal power plant 40 is realized. The lean solution is cooled to a suitable temperature in a second cooler 44 before entering the absorber tower 42 to achieve a higher absorption rate. In the absorption tower 42, CO in the flue gas 2 Absorbed by the lean solution from the outlet of the second cooler 44 to form a rich solution. The rich solution is compressed by the rich solution pump 43 to the pressure of the desorption column 46. The heat exchanger 45 warms the rich solution. The heat at the bottom of the desorber 46 continuously increases the temperature of the rich solution, resulting in a significant amount of water evaporation with the desorbed CO 2 Ascending to break up CO in the rich solution 2 With solvent, this gas mixture rises to top condensate, most of the water is condensed and returned to the desorber column 46, while CO containing residual moisture (up to 99% purity) 2 Enters the third cooler 48 for cooling and then enters the third compressor 49 for compression. The regenerated lean solution at the bottom of the desorption tower 46 is pressurized by a lean solution pump 47, passes through a heat exchanger 45 and a second cooler 44 to reach a proper temperature, and enters an absorption tower 42 to absorb CO in the flue gas 2 . The decarbonized flue gas is discharged from the top of the absorption tower 42.
The methanol synthesis subsystem 5 is respectively connected with the electrolytic water hydrogen production subsystem 3 and the thermal power generating unit carbon capture subsystem 4, and the methanol synthesis subsystem 5 is used for preparing methanol based on hydrogen prepared by the electrolytic water hydrogen production subsystem 3 and carbon dioxide captured by the thermal power generating unit carbon capture subsystem 4.
Specifically, the methanol synthesis subsystem 5 includes: a first mixer 51, a methanol synthesis column 52, a fourth cooler 53, a flash evaporator 54, a rectifying column 55, a separator 56, and a second mixer 57.
The inlet of the first mixer 51 is respectively connected with the electrolytic water hydrogen production subsystem 3 and the thermal power generating unit carbon capture subsystem 4. The outlet of the first mixer 51, the methanol synthesis tower 52, the fourth cooler 53, and the inlet of the flash evaporator 54 are connected in this order.
CO trapped by carbon trapping subsystem 4 of thermal power generating unit 2 Green hydrogen produced with the electrolyzed water hydrogen production subsystem 3 is mixed in a first mixer 51 and CO is promoted by a solid catalyst (Cu/ZnO/Al 2O 3) in a methanol synthesis tower 52 2 Hydrogenation reaction for synthesizing methanol, exothermic reaction for raising temperature of methanol synthesizing tower 52, and mixed gas after reaction mainly contains CO 2 Carbon monoxide, hydrogen and methanol. For separation and purification, the mixed gas is cooled in the fourth cooler 53 and then enters the flash evaporator 54.
The non-condensable gas outlet of the flash vessel 54 is connected to the inlet of the separator 56 to separate the non-condensable gas to obtain a recycle tail gas and an exhaust gas. The recycle tail gas outlet of the separator 56 is connected to the inlet of the first mixer 51. The exhaust gas outlet of the separator 56 is connected to the inlet of the second mixer 57.
Due to the lower one-way conversion of methanol, a separator 56 is added for tail gas recovery to significantly increase CO 2 Is a conversion rate of (a). The non-condensable gases are sent to a separator 56 for separation, and the recycle tail gas is recycled to participate in the reaction. The remaining part is fed as exhaust gas to the second mixer 57.
The crude methanol outlet of the flash vessel 54 is connected to the inlet of the rectifying column 55. The off-gas outlet of the rectifying column 55 is connected to the inlet of the second mixer 57. The methanol outlet of the rectifying tower 55 outputs methanol.
The remaining liquid in flash vessel 54 is crude methanol, which is primarily synthesized from methanol and water, and contains a small amount of CO 2 And oxygen. The crude methanol enters a rectifying tower 55, refined methanol is obtained through flash distillation and rectification, and the waste gas enters a second mixer 57 and is discharged after being treated together with the waste gas discharged from a separator 56.
The invention stores redundant renewable energy power by electrolyzing water to prepare hydrogen, reduces the wind and light discarding phenomenon, improves the utilization level of renewable energy, and captures high-purity CO captured by the thermal power unit carbon capture subsystem 4 2 The hydrogen generated by the hydrogen production device 31 by electrolyzing water is sent into the methanol synthesis subsystem 5 to prepare methanol, so that the problems of development and utilization of the hydrogen are solved, the dependence on fossil fuel is reduced, and the carbon emission is reduced.
Further, the polygeneration system applicable to the Sha Ge barren region energy base provided by the invention further comprises: and the ammonia synthesis subsystem 6 is connected with the water electrolysis hydrogen production subsystem 3 and is used for producing ammonia by utilizing the hydrogen prepared by the water electrolysis hydrogen production subsystem 3.
Specifically, the ammonia synthesis subsystem 6 is a green haber ammonia synthesis system. The ammonia synthesis subsystem 6 comprises: an air separation device 61, a fourth compressor 62, a third mixer 63, an ammonia synthesis column 64, and a condenser 65.
The inlet of the air separation device 61 is filled with air and is connected with the electrolytic water hydrogen production subsystem 3. Specifically, the inlet of the air separation unit 61 is connected to the oxygen outlet of the electrolyzed water forming hydrogen system 31.
The outlet of the air separation unit 61, the fourth compressor 62, the third mixer 63, the ammonia synthesis tower 64, and the inlet of the condenser 65 are connected in this order.
The ammonia gas outlet of the condenser 65 outputs ammonia gas.
The non-condensable gas outlet of the condenser 65 is connected to the inlet of the third mixer 63.
The inlet of the third mixer 63 is also connected to the electrolytic water hydrogen production subsystem 3.
After the ammonia, the hydrogen and the nitrogen which are not completely reacted in the ammonia synthesis subsystem 6 leave the ammonia synthesis tower 64, the non-condensable mixed gas is continuously introduced into the ammonia synthesis tower 64 through the third mixer 63 to form cyclic utilization, so that the production cost is saved.
In order to ensure the development and utilization of hydrogen, the energy storage function is realized by utilizing the technology of producing green ammonia by water electrolysis and hydrogen production, ammonia can be liquefied under the normal temperature condition and the pressure of 0.8-1.2 MPa, and the storage and transportation of ammonia are very convenient and economic by adopting the form of liquid ammonia according to the physical property and the storage characteristics. Green ammonia production (raw materials from renewable energy driven water electrolysis and air separation) is considered a clean ammonia production route. The ammonia synthesis reaction is completed in a high pressure environment in the ammonia synthesis column 64, the hydrogen gas outputted from the first compressor 33 is mixed with the nitrogen gas from the air separation unit 61 and pressurized by the fourth compressor 62 in the third mixer 63, a part of the mixed gas is reacted with the nitrogen gas in the ammonia synthesis column 64 to synthesize ammonia gas, the ammonia and the unreacted hydrogen gas and nitrogen gas leave the ammonia synthesis column 64, and the mixed gas is liquefied by the condenser 65 to separate ammonia.
On the other hand, the non-condensable gas is continuously introduced into the ammonia synthesis tower 64 after being mixed by the third mixer 63, so that recycling is formed, and the production cost is saved.
More than 90% of the current synthetic ammonia paths come from ammonia production by coal and CO as a byproduct 2 The emission is large, and belongs to the industry with high energy consumption and high emission. Along with the promotion of the photovoltaic wind power technology, the downward adjustment of green electricity price and the low-carbon guidance, the hydrogen production by electrolysis of water instead of fossil energy source hydrogen production has market feasibility, and under the influence of the trend, the synthetic ammonia of hydrogen and nitrogen under the action of an iron-based catalyst has the core path of the Haber method unchanged except that the synthetic ammonia is kept, and the hydrogen source is changed from using fossil energy source and water as raw materials to using only water as raw materials for hydrogen supply. The process is changed from the discharge of a large amount of carbon dioxide as a byproduct to the hydrogen production by water, and ammonia is produced by water hydrogen production, so that the ammonia synthesis industry decarbonizes to obtain a new development space, such as being used as fuel for replacing ship combustion, being used for storing energy for replacing kerosene and gas for power generation, and the like.
The photovoltaic wind power resources in Sha Gehuang area are rich, and the green electricity electrolyzes water to produce hydrogen and replace coal, so that the energy conservation and carbon reduction can be realized greatly. The produced ammonia heavy oil can be used for ship combustion, becomes green petroleum produced on the ground, and along with the progress of photovoltaic technology and the saturation of green electricity market, physical photovoltaics are bound to be transformed into chemical photovoltaics. Photovoltaic wind power plants face the dilemma of green electricity digestion, and hydrogen production and ammonia production by water electrolysis can be regarded as a large number of digestion means and industrial chains. The photovoltaic wind power plant has a raw material workshop which is going to become ammonia synthesis in one day, the technology for producing green ammonia by water electrolysis hydrogen production provides a solution for producing synthetic ammonia fertilizer with low carbon and low cost, the ammonia synthesis is going to enter the electro-hydrogen era, and the ammonia is going to be changed from chemical positioning to energy storage and special energy storage fuel positioning.
The invention integrates the renewable energy power generation subsystem 1, the electrolyzed water hydrogen production subsystem 3, the thermal power unit carbon capture subsystem 4, the methanol synthesis subsystem 5 and the ammonia synthesis subsystem 6, effectively overcomes the phenomena of wind and light abandoning in Sha Ge barren areas under the condition that wind and light output and user electricity demand regularly fluctuate, and captures high-purity CO captured by the thermal power unit carbon capture subsystem 4 2 The methanol is prepared by taking green hydrogen as a reactant, the development and the utilization of hydrogen are realized by utilizing the fuel substitute methanol which is convenient to store and transport, the carbon utilization is realized while decarbonizing the thermal power plant 40, the economic benefit of the thermal power plant carbon capture subsystem 4 is improved, the dependence of a conventional methanol synthesis method on fossil fuel is reduced by the methanol prepared by the method, and in addition, the CO captured by the thermal power plant 40 2 When the green hydrogen is not fully utilized, the hydrogen production and the ammonia production by the water electrolysis can be regarded as a mass digestion means of renewable power, and a solution for producing the synthetic ammonia with low carbon and low cost is provided.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (7)
1. A polygeneration system suitable for use in an energy base in a Sha Ge barren region, the polygeneration system suitable for use in an energy base in a Sha Ge barren region comprising:
the renewable energy source power generation subsystem is connected with a power grid, and is used for generating power by using renewable energy sources and supplying power to the power grid;
the water electrolysis hydrogen production subsystem is connected with the renewable energy power generation subsystem and is used for preparing hydrogen based on the electric power generated by the renewable energy power generation subsystem;
the thermal power unit carbon capture subsystem is used for decarburizing the flue gas of the thermal power plant and capturing carbon dioxide;
and the methanol synthesis subsystem is respectively connected with the water electrolysis hydrogen production subsystem and the thermal power unit carbon capture subsystem and is used for preparing methanol based on hydrogen prepared by the water electrolysis hydrogen production subsystem and carbon dioxide captured by the thermal power unit carbon capture subsystem.
2. The polygeneration system suitable for use in Sha Ge waste land energy bases of claim 1, wherein said electrolyzed water hydrogen production subsystem comprises: an electrolytic water hydrogen production device, a first cooler and a first compressor;
the inlet of the electrolytic water hydrogen production device is filled with water and is connected with the renewable energy power generation subsystem; the hydrogen outlet of the electrolytic water hydrogen production device, the first cooler and the inlet of the first compressor are sequentially connected; the outlet of the first compressor is connected with the methanol synthesis subsystem.
3. The polygeneration system suitable for use in Sha Ge waste land energy bases of claim 1, wherein the thermal power plant carbon capture subsystem comprises: the system comprises a thermal power plant, a second compressor, an absorption tower, a rich liquid pump, a second cooler, a heat exchanger, a desorption tower, a lean liquid pump, a third cooler and a third compressor;
the flue gas outlet of the thermal power plant, the second compressor and the flue gas inlet of the absorption tower are sequentially connected;
the rich solution outlet of the absorption tower, the rich solution pump, the heat exchanger and the inlet of the desorption tower are sequentially connected;
the lean liquid outlet of the desorption tower, the lean liquid pump, the heat exchanger, the second cooler and the lean liquid inlet of the absorption tower are sequentially connected;
the carbon dioxide outlet of the desorption tower, the third cooler and the inlet of the third compressor are sequentially connected; the outlet of the third compressor is connected with the methanol synthesis subsystem.
4. The polygeneration system of claim 1, adapted for use in an energy base of Sha Ge barren regions, wherein the methanol synthesis subsystem comprises: the device comprises a first mixer, a methanol synthesis tower, a fourth cooler, a flash evaporator, a rectifying tower, a separator and a second mixer;
the inlet of the first mixer is respectively connected with the electrolytic water hydrogen production subsystem and the thermal power unit carbon capture subsystem;
the outlet of the first mixer, the methanol synthesis tower, the fourth cooler and the inlet of the flash evaporator are sequentially connected;
the non-condensable gas outlet of the flash evaporator is connected with the inlet of the separator so as to separate the non-condensable gas and obtain circulating tail gas and waste gas;
the circulating tail gas outlet of the separator is connected with the inlet of the first mixer;
the exhaust gas outlet of the separator is connected with the inlet of the second mixer;
the crude methanol outlet of the flash evaporator is connected with the inlet of the rectifying tower;
the waste gas outlet of the rectifying tower is connected with the inlet of the second mixer;
and a methanol outlet of the rectifying tower outputs methanol.
5. The polygeneration system of claim 1, adapted for use with an energy base in Sha Ge barren regions, wherein the polygeneration system adapted for use with an energy base in Sha Ge barren regions further comprises:
the ammonia synthesis subsystem is connected with the water electrolysis hydrogen production subsystem and is used for producing ammonia by utilizing the hydrogen prepared by the water electrolysis hydrogen production subsystem.
6. The polygeneration system suitable for use in an energy base of a Sha Ge wasteland area of claim 5, wherein said ammonia synthesis subsystem is a green haber ammonia synthesis system.
7. The polygeneration system suitable for use in Sha Ge waste land energy bases of claim 5, wherein said ammonia synthesis subsystem comprises: an air separation device, a fourth compressor, a third mixer, an ammonia synthesis tower and a condenser;
the inlet of the air separation device is filled with air and is connected with the water electrolysis hydrogen production subsystem;
the outlet of the air separation device, the fourth compressor, the third mixer, the ammonia synthesis tower and the inlet of the condenser are sequentially connected;
the ammonia gas outlet of the condenser outputs ammonia gas;
the non-condensable gas outlet of the condenser is connected with the inlet of the third mixer;
the inlet of the third mixer is also connected with the hydrogen production subsystem through water electrolysis.
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