CN114914945A - Photovoltaic direct-current off-grid electricity hydrogen production system and capacity optimal configuration method and self-adaptive control method thereof - Google Patents
Photovoltaic direct-current off-grid electricity hydrogen production system and capacity optimal configuration method and self-adaptive control method thereof Download PDFInfo
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- 239000001257 hydrogen Substances 0.000 title claims abstract description 387
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 387
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 373
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 280
- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000005611 electricity Effects 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 144
- 239000007789 gas Substances 0.000 claims abstract description 96
- 238000003860 storage Methods 0.000 claims abstract description 79
- 239000007788 liquid Substances 0.000 claims abstract description 78
- 238000000746 purification Methods 0.000 claims abstract description 73
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- 230000005540 biological transmission Effects 0.000 claims abstract description 40
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- 239000001301 oxygen Substances 0.000 claims description 99
- 229910052760 oxygen Inorganic materials 0.000 claims description 99
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 97
- 239000003513 alkali Substances 0.000 claims description 62
- 238000005868 electrolysis reaction Methods 0.000 claims description 41
- 239000000498 cooling water Substances 0.000 claims description 16
- 150000002431 hydrogen Chemical class 0.000 claims description 11
- 239000002994 raw material Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 7
- 230000003044 adaptive effect Effects 0.000 claims description 6
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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
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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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
- 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
- C25B15/02—Process control or regulation
-
- 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
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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
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/17—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof
- C25B9/19—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms
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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
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/60—Constructional parts of cells
- C25B9/65—Means for supplying current; Electrode connections; Electric inter-cell connections
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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
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/34—Electrical components comprising specially adapted electrical connection means to be structurally associated with the PV module, e.g. junction boxes
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/38—Energy storage means, e.g. batteries, structurally associated with PV modules
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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Abstract
The embodiment of the invention provides a photovoltaic direct-current off-grid power hydrogen production system and a capacity optimization configuration method and a self-adaptive control method thereof, and relates to the technical field of hydrogen production. The photovoltaic direct-current off-grid electricity hydrogen production system comprises a photovoltaic direct-current hydrogen production module, a gas transmission pipeline, a gas storage tank system and a compressor, wherein the photovoltaic direct-current hydrogen production module is collected to the gas storage tank system through the gas transmission pipeline, and an outlet of the gas storage tank system is connected with the compressor, wherein the photovoltaic direct-current hydrogen production module comprises a photovoltaic array, a confluence box, a DC/DC converter, an electrolyzed water hydrogen production tank and a gas-liquid separation and purification device which are sequentially connected. The system can save investment of direct current cables, can realize flexible configuration of the photovoltaic direct current hydrogen production module, and is suitable for photovoltaic large-scale development and absorption in remote areas such as deserts, Gobi and desert.
Description
Technical Field
The invention relates to the technical field of hydrogen production, in particular to a photovoltaic direct-current off-grid hydrogen production system and a capacity optimal configuration method and a self-adaptive control method thereof.
Background
The construction of large-scale new energy bases in deserts, gobi, deserts and other areas has important significance for resource utilization, but no power grid exists in remote areas or the power grid is weak, so that large-scale new energy power development needs to wait for the construction of the power grid, and the large-scale new energy development progress is influenced. The large-scale photovoltaic hydrogen production becomes an important application mode for solving the problems of large-scale development of new energy and local consumption in remote areas.
The traditional large-scale photovoltaic grid-connected hydrogen production system has multiple links of inversion, boosting and grid-connected, transmission, voltage reduction, rectification hydrogen production and the like, and is high in system loss and construction cost; and large-scale photovoltaic access needs a power grid to provide an access point, and the fluctuation and randomness of the access point easily influence the safe and stable operation of the power grid. Therefore, the scheme of the large-scale photovoltaic direct current hydrogen production system becomes an important technical path concerned by the new energy industry.
Patent applications CN107359363A, CN110601231A and CN107196418A all propose a system based on integration of photovoltaic hydrogen production and hydrogen fuel cell, wherein one part of power generation of a photovoltaic cell matrix is directly inverted to be on the Internet, and the other part of power generation of the photovoltaic cell matrix is on the Internet through hydrogen production and fuel cell power generation, so that the storage of photovoltaic power generation is realized. However, the frequent fluctuation of photovoltaic power generation can affect the safety of hydrogen production equipment, and the regulation rate of the hydrogen production equipment cannot meet the demand of rapid regulation of dispatching. Patent application CN113098038A proposes a photovoltaic hydrogen production and energy storage system, comprising: the photovoltaic power station comprises a photovoltaic panel array, a junction box, a direct current box, an inverter and a boosting system, and electricity generated by the photovoltaic panel array is conveyed to a power grid through the junction box, the direct current box, the inverter and the boosting system in sequence. Patent application CN111934348A proposes a distributed hydrogen production and shared energy storage direct current side access system of a photovoltaic power station, and solves the problem of electricity abandonment of the photovoltaic power station by utilizing a shared battery energy storage system. According to the technical scheme, the photovoltaic power generation is mainly absorbed by a power grid, and is not suitable for large-scale development of new energy in remote areas such as deserts, Gobi and deserts.
Patent application CN112217227A provides a direct-current coupling photovoltaic off-grid hydrogen production system and a control method thereof, which optimizes control methods of standby, startup and the like of a DC/DC converter and avoids the problem that the DC/DC converter is frequently started up and shut down when the illumination is weak in the prior art. Patent application CN112217192A provides a direct current coupling photovoltaic off-grid hydrogen production system and a control method thereof, which optimizes the connection mode of N group series power converters, avoids the problem that the whole hydrogen production system is closed due to the fault of a single DC/DC converter, increases the reliability of power distribution, and enhances the redundancy performance of the system. Patent application CN112217193A proposes a direct current coupling photovoltaic off-grid hydrogen production system and a control method thereof, and power supply reliability is improved by optimizing a DC/DC conversion unit. Patent application CN112994075A proposes a photovoltaic off-grid hydrogen production method and system, the photovoltaic off-grid hydrogen production system comprising: the system comprises a photovoltaic array system, a two-stage DC/DC converter system hydrogen production tank system and a control system. Patent application CN114182276A proposes a direct current coupling photovoltaic off-grid hydrogen production system and a control method thereof, wherein a photovoltaic square matrix supplies power to auxiliary electric equipment continuously through a DC/AC conversion unit. The above patent applications all adopt the photovoltaic direct current off-grid electrical hydrogen production system technology, and the direct current bus collection adopted in the system leads to large-scale photovoltaic hydrogen production direct current cables with large length and high investment cost; and the technical scheme adopts the gas storage tank, and does not consider the combined regulation and control of the hydrogen production by electricity, the gas storage tank and the gas transmission official network, so that the requirements of large-scale development of the new energy hydrogen production by electricity and the problem of large-scale hydrogen output are difficult to meet.
It can be seen that the current photovoltaic direct current hydrogen production system has at least the following problems:
1. the grid-connected photovoltaic hydrogen production system has large capacity when being connected into a power grid, has high requirements on a power transmission channel and the power grid regulation capacity, and is not suitable for the application scene of large-scale new energy hydrogen production in desert, next door and desert areas of weak power grids or without power grids;
2. direct current collection is adopted in an off-grid photovoltaic direct current hydrogen production system, so that the cable length is large and the investment cost is high;
3. the off-grid photovoltaic direct-current hydrogen production system adopts a gas storage system, has limited storage capacity, does not consider the combined regulation and control of the hydrogen production by electricity, a gas storage tank and a gas transmission pipe network, is difficult to meet the requirement of large-scale development of the new energy hydrogen production and the requirement of large-scale outward transmission of hydrogen, and does not consider how to solve the water source of the large-scale new energy hydrogen production in deserts, partitions and desert regions;
4. the capacity of the photovoltaic array and the power of the electrolytic cell do not adopt an optimal configuration method, so that the utilization rate of the electric hydrogen production equipment is low, and the economy of the photovoltaic hydrogen production system is influenced.
Disclosure of Invention
The invention aims to provide a photovoltaic direct current off-grid electricity hydrogen production system, a capacity optimization configuration method and an adaptive control method thereof, which can save direct current cable investment, realize flexible configuration of photovoltaic direct current hydrogen production modules and are suitable for photovoltaic large-scale development and absorption in remote areas such as deserts, Gobi and deserts.
Embodiments of the invention may be implemented as follows:
in a first aspect, the invention provides a photovoltaic direct-current off-grid hydrogen production system, which comprises a photovoltaic direct-current hydrogen production module, a gas transmission pipeline, a gas storage tank system and a compressor, wherein the photovoltaic direct-current hydrogen production module is collected to the gas storage tank system through the gas transmission pipeline, and an outlet of the gas storage tank system is connected with the compressor, wherein the photovoltaic direct-current hydrogen production module comprises a photovoltaic array, a confluence box, a DC/DC converter, an electrolyzed water hydrogen production tank and a gas-liquid separation and purification device which are sequentially connected.
In an optional embodiment, the photovoltaic array, the header box, the DC/DC converter and the water electrolysis hydrogen production tank which are connected in sequence form a hydrogen production unit, and a plurality of hydrogen production units share one gas-liquid separation and purification device.
In an optional embodiment, the photovoltaic direct-current off-grid hydrogen production system comprises a plurality of photovoltaic direct-current hydrogen production modules, and the photovoltaic direct-current hydrogen production modules are connected in parallel and then collected to the gas storage tank system through a gas transmission pipeline.
In an optional embodiment, the photovoltaic direct current off-grid electrical hydrogen production system comprises a plurality of photovoltaic direct current hydrogen production modules, wherein the plurality of photovoltaic direct current hydrogen production modules share auxiliary equipment;
in each photovoltaic direct current hydrogen production module, a photovoltaic array, a junction box, a DC/DC converter and an electrolytic water hydrogen production tank which are sequentially connected form a hydrogen production unit, and a plurality of hydrogen production units share one gas-liquid separation and purification device.
In an alternative embodiment, the gas transmission pipeline comprises a hydrogen pipeline and an oxygen pipeline, the gas storage tank system comprises a hydrogen storage tank and an oxygen storage tank, and the compressor comprises a hydrogen compressor and an oxygen compressor;
the gas-liquid separation purification device is connected to a hydrogen storage tank through a hydrogen pipeline, the hydrogen storage tank is connected to a hydrogen compressor, the hydrogen compressor is connected to an external hydrogen conveying pipeline, the gas-liquid separation purification device is connected to an oxygen storage tank through an oxygen pipeline, the oxygen storage tank is connected to the oxygen compressor, and the oxygen compressor is connected to an external oxygen conveying pipeline.
In an optional embodiment, the photovoltaic direct current off-grid electrical hydrogen production system further comprises a water pipeline, a water storage tank, a first liquid pump and a second liquid pump;
the electrolytic water hydrogen production tank is connected to a first liquid pump through a water pipeline, the first liquid pump is connected to a water storage tank, and the water storage tank is connected to an external water pipeline through a second liquid pump.
In an optional embodiment, the gas-liquid separation and purification device comprises a hydrogen alkali liquid separation device, a hydrogen purification device, an oxygen alkali liquid separation device and an oxygen purification device;
hydrogen and alkali liquor mixture from the water electrolysis hydrogen production tank enters a hydrogen and alkali liquor separation device, the separated hydrogen enters hydrogen purification equipment, and a hydrogen storage tank, a hydrogen compressor and an external hydrogen conveying pipeline are connected behind the hydrogen purification equipment; the oxygen and alkali liquor mixture from the water electrolysis hydrogen production tank enters an oxygen and alkali liquor separation device, the separated oxygen enters oxygen purification equipment, and an oxygen storage tank, an oxygen compressor and an external oxygen transmission pipeline are connected behind the oxygen purification equipment.
In an optional embodiment, the photovoltaic direct-current off-grid hydrogen production system further comprises a freezing water pipeline, a cooling water pipeline and an alkali liquor pipeline;
freezing water pipeling supplies the refrigerated water for hydrogen purification equipment and oxygen purification equipment, cooling water pipeling provides the cooling water for hydrogen alkali lye separator and oxygen alkali lye separator, hydrogen alkali lye separator and oxygen alkali lye separator are connected to the water pipeling respectively through the alkali lye pipeline, the water pipeling is connected to brineelectrolysis hydrogen manufacturing groove, the alkali lye that hydrogen alkali lye separator and oxygen alkali lye separator came out, enter into brineelectrolysis hydrogen manufacturing groove through the alkali lye pipeline, the water pipeling is according to brineelectrolysis hydrogen manufacturing water consumption supplementary raw materials water in the brineelectrolysis hydrogen manufacturing groove.
In a second aspect, the present invention provides a capacity optimization configuration method for a photovoltaic direct-current off-grid hydrogen production system, where the capacity optimization configuration method for the photovoltaic direct-current off-grid hydrogen production system is applied to the photovoltaic direct-current off-grid hydrogen production system of the foregoing embodiment, and the method includes:
the first step is as follows: determining the direct-current bus voltage U of the photovoltaic array;
the second step is that: determining the output-side voltage U of a DC/DC converter 1 Further determining the power P of the water electrolysis hydrogen production tank;
the third step: and determining the component capacity of the photovoltaic array according to the power regulation range of the electrolytic water hydrogen production tank.
In a third aspect, the present invention provides an adaptive control method for a photovoltaic direct-current off-grid hydrogen production system, where the adaptive control method for the photovoltaic direct-current off-grid hydrogen production system is applied to the photovoltaic direct-current off-grid hydrogen production system in the foregoing embodiment, and the method includes:
according to the operating power of the electrolytic water hydrogen production tank, regulating the flow of the alkali liquor, the flow of the cooling water and the flow of the raw material water in the gas-liquid separation device, and ensuring that the temperature of the alkali liquor at the inlet of the electrolytic water hydrogen production tank is 65-70 ℃ and the temperature range of the alkali liquor at the outlet of the electrolytic water hydrogen production tank is 80-90 ℃;
and controlling the valve to ensure that the outlet pressure of the oxygen side and the outlet pressure of the hydrogen side in the gas-liquid separator are the same, and automatically adjusting the outlet gas pressure of the purification equipment according to the pressure of a gas pipeline in the field.
The photovoltaic direct current off-grid electricity hydrogen production system and the capacity optimization configuration method and the self-adaptive control method thereof provided by the embodiment of the invention have the beneficial effects that:
1. the gas pipeline replaces a direct current cable, the investment of the direct current cable is saved, the flexible configuration of a photovoltaic direct current hydrogen production module can be realized, and meanwhile, the photovoltaic large-scale development and absorption in remote areas such as deserts, gobi, deserts and the like are realized by combining the development trend of outward transportation of the hydrogen pipeline in a large-scale new energy base;
2. the gas transmission pipeline is adopted to replace the traditional power transmission line, and the combined optimization of hydrogen production, hydrogen storage and hydrogen transmission is adopted, so that the utilization rate of the gas transmission pipeline is improved, and the problems of low utilization rate of the power transmission line due to low utilization hours of photovoltaic power generation are solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a block diagram of a photovoltaic DC off-grid hydrogen production system according to a first embodiment of the present invention;
FIG. 2 is a block diagram of a photovoltaic DC off-grid hydrogen production system according to a second embodiment of the present invention;
FIG. 3 is a block diagram of a photovoltaic DC off-grid hydrogen production system according to a third embodiment of the present invention;
FIG. 4 is a block diagram of a photovoltaic DC off-grid hydrogen production system according to a fourth embodiment of the present invention;
fig. 5 is a schematic view of the working principle of the gas-liquid separation and purification device in the system.
Icon: 100-photovoltaic direct current off-grid hydrogen production system; 1-photovoltaic direct current hydrogen production module; 2-a hydrogen production unit; 21-a photovoltaic array; 22-a combiner box; 23-DC/DC converter; 24-a hydrogen production tank by water electrolysis; 25-gas-liquid separation and purification device; 3-hydrogen alkali liquor separation device; 4-hydrogen purification equipment; 5-oxygen alkali liquor separation device; 6-oxygen purification equipment; 7-a gas pipeline; 71-a hydrogen line; 72-an oxygen line; 8-a gas reservoir system; 81-hydrogen storage tank; 82-an oxygen storage tank; 9-a compressor; 91-a hydrogen compressor; 92-an oxygen compressor; 10-a water pipeline; 11-a water storage tank; 12-a first liquid pump; 13-a second liquid pump; 14-a chilled water pipeline; 15-cooling water pipeline; 16-alkali liquor pipeline.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
The large-scale photovoltaic direct-current off-grid electricity hydrogen production system does not need to be examined and approved by photovoltaic network access, the construction period can be greatly shortened, and the scale and the capacity are more flexibly set; the system has no links such as boosting, transmission, pressure reduction hydrogen production and the like, has higher system efficiency than grid-connected hydrogen production, and has no influence on a large power grid due to off-grid operation. However, the large-scale photovoltaic direct-current collection off-grid hydrogen production system needs direct-current collection and direct-current transmission, so that the investment cost of the centralized photovoltaic direct-current hydrogen production system is high. In order to solve the problems, the embodiment of the invention provides a large-scale photovoltaic direct-current off-grid hydrogen production system based on gas pipeline collection, and the specific structure is as follows.
First embodiment
Referring to fig. 1, the present embodiment provides a photovoltaic direct-current off-grid hydrogen production system 100, which includes a photovoltaic direct-current hydrogen production module 1, a gas transmission pipeline 7, a gas storage tank system 8, and a compressor 9, wherein the photovoltaic direct-current hydrogen production module 1 includes a photovoltaic array 21, a junction box 22, a DC/DC converter 23, an electrolytic water hydrogen production tank 24, and a gas-liquid separation and purification device 25, which are sequentially connected.
The photovoltaic direct current hydrogen production module 1 is connected with equipment such as a gas transmission pipeline 7, a gas storage tank system 8 and a compressor 9, the photovoltaic direct current hydrogen production module 1 is collected to the gas storage tank system 8 through the gas transmission pipeline 7, an outlet of the gas storage tank system 8 is connected with the compressor 9, and then the photovoltaic direct current hydrogen production module is connected with the gas transmission pipeline 7 with large capacity and is conveyed to downstream hydrogen customers such as chemical enterprises. In the technical scheme, the gas transmission pipeline 7 is adopted to replace a power transmission line, and the method is suitable for scenes of no power grid, weak power grid and the like existing in remote areas such as deserts, Gobi and deserts.
According to the technical scheme, the gas pipeline 7 replaces a direct current cable, the investment of the direct current cable is saved, meanwhile, the development trend of outward transportation of the hydrogen pipeline 71 in a large new energy base is combined, photovoltaic large-scale development in remote areas such as deserts, gobi and deserts can be realized, and a novel large-scale off-grid photovoltaic direct current hydrogen production scheme of large-scale outward transportation in a hydrogen mode can also be realized.
Second embodiment
Referring to fig. 2, the present embodiment provides a photovoltaic direct current off-grid hydrogen production system 100, which has a similar structure to that provided in the first embodiment, and is different in that the photovoltaic direct current hydrogen production module 1 includes a hydrogen production unit 2 and a gas-liquid separation and purification device 25, and a plurality of hydrogen production units 2 share one gas-liquid separation and purification device 25, so as to reduce the cost of the gas-liquid separation and purification device.
The hydrogen production unit 2 comprises a photovoltaic array 21, a header box 22, a DC/DC converter 23 and a water electrolysis hydrogen production tank 24 which are connected in sequence. In this way, the hydrogen production efficiency of the photovoltaic direct current off-grid hydrogen production system 100 can be improved.
Third embodiment
Referring to fig. 3, the present embodiment provides a photovoltaic direct current off-grid hydrogen production system 100, which has a similar structure to that of the system provided in the first embodiment, except that a plurality of photovoltaic direct current hydrogen production modules 1 are provided.
Each photovoltaic direct-current hydrogen production module 1 comprises a photovoltaic array 21, a header box 22, a DC/DC converter 23, an electrolytic water hydrogen production tank 24 and a gas-liquid separation and purification device 25 which are connected in sequence.
The gas transmission pipeline 7 comprises a hydrogen pipeline 71 and an oxygen pipeline 72, the gas storage tank system 8 comprises a hydrogen storage tank 81 and an oxygen storage tank 82, and the compressor 9 comprises a hydrogen compressor 91 and an oxygen compressor 92. The photovoltaic direct current off-grid electrical hydrogen production system 100 further comprises a water pipeline 10, a water storage tank 11, a first liquid pump 12, a second liquid pump 13 and a system controller (not shown in the figure).
The system controller is connected to the combiner box 22, the DC/DC converter 23, the water electrolysis hydrogen production tank 24, the gas-liquid separation and purification device 25, the hydrogen compressor 91, the oxygen compressor 92, the first liquid pump 12, the second liquid pump 13 and the sensors of the pipe valves, and the communication network meets the requirement of two-way communication. The system controller adopts an optimization control algorithm to control the photovoltaic direct current hydrogen production module 1, and realizes the control of key processes such as photovoltaic power generation, electrical hydrogen production, gas-liquid separation, gas purification, raw material water supplement, cooling water flow and the like.
Wherein, the electrolytic water hydrogen production tanks 24 are connected through the water pipeline 10. The water pipe 10 is connected to the water storage tank 11 through a first liquid pump 12, and the water storage tank 11 is connected to the external water pipe 10 through a second liquid pump 13. The gas-liquid separation and purification device 25 is connected to a hydrogen storage tank 81 through a hydrogen pipe 71, the hydrogen storage tank 81 is connected to a hydrogen compressor 91, and the hydrogen compressor 91 is connected to an external hydrogen pipe. The gas-liquid separation and purification device 25 is connected to an oxygen storage tank 82 through an oxygen pipeline 72, the oxygen storage tank 82 is connected to an oxygen compressor 92, and the oxygen compressor 92 is connected to an external oxygen pipeline.
The photovoltaic direct current hydrogen production module 1 is controlled in an internal self-adaptive mode, and the DC/DC converter 23 is adjusted according to the photovoltaic power generation power so as to realize that the power of the water electrolysis hydrogen production tank 24 is the same as that of the photovoltaic array 21. The photovoltaic direct current hydrogen production module 1 generates hydrogen and oxygen, the hydrogen and the oxygen are purified and then are connected to a plant gas pipeline to realize gas collection, and a gas check valve is arranged at a gas outlet of gas purification equipment, so that the influence of the reverse flow of gas in the plant gas pipeline on the internal operation control of the photovoltaic direct current hydrogen production module 1 is avoided. The different photovoltaic direct current hydrogen production modules 1 operate independently, and the power generation of the photovoltaic array 21 can be utilized to the maximum extent to continuously electrolyze water to produce hydrogen. The regulation and control strategy of the photovoltaic direct current off-grid hydrogen production system 100 is to regulate the operation condition of the compressor 9 according to the gas pressure at the outlet of the gas storage tank, so as to ensure that the gas entering the gas transmission pipeline 7 meets the requirement of the gas transmission pipeline 7.
Fourth embodiment
Referring to fig. 4, the present embodiment provides a photovoltaic direct current off-grid hydrogen production system 100, which has a similar structure to that provided in the third embodiment, except that a plurality of photovoltaic direct current hydrogen production modules 1 are provided to form a photovoltaic direct current hydrogen production array, and the plurality of photovoltaic direct current hydrogen production modules 1 share an auxiliary device. Each photovoltaic direct-current hydrogen production module 1 comprises a hydrogen production unit 2 and a gas-liquid separation and purification device 25, and the plurality of hydrogen production units 2 share one gas-liquid separation and purification device 25, so that the cost of the gas-liquid separation and purification device is reduced.
The hydrogen production unit 2 comprises a photovoltaic array 21, a header box 22, a DC/DC converter 23 and a water electrolysis hydrogen production tank 24 which are connected in sequence. In this way, the hydrogen production efficiency of the photovoltaic direct current off-grid hydrogen production system 100 can be improved.
The photovoltaic direct current hydrogen production array is connected with a water inlet pipeline 10, a hydrogen pipeline 71 and an oxygen pipeline 72 in parallel. In the embodiment, the photovoltaic direct current hydrogen production module 1 is controlled in an internal self-adaptive manner, and the DC/DC converter 23 is adjusted according to the photovoltaic power generation power, so that the power of the water electrolysis hydrogen production tank 24 is the same as that of the photovoltaic array 21. The different photovoltaic direct current hydrogen production modules 1 operate independently, and the power generation of the photovoltaic array 21 can be utilized to the maximum extent to continuously electrolyze water to produce hydrogen. In the embodiment, a plurality of photovoltaic direct current hydrogen production modules 1 share one set of gas-liquid separation and purification device 25, so that the consistency of the temperature of the alkali liquor and the purity of the gas at the outlet of the purification device can be improved, and the investment of the gas-liquid separation device and the purification equipment can be reduced.
In the above embodiment, the water sources of the raw water, the cooling water and the chilled water in the hydrogen production tank 24 by electrolysis and the gas-liquid separation and purification device 25 are all from the water pipeline 10, the water pipeline 10 is industrial water, and the hydrogen production tank 24 by electrolysis and the gas-liquid separation and purification device 25 comprise water purification equipment and chilled water preparation equipment. Hydrogen at the outlets of the gas purification devices of the photovoltaic direct current hydrogen production modules 1 all enters the hydrogen pipeline 71, and oxygen at the outlets of the gas purification devices all enters the oxygen pipeline 72. The hydrogen pipeline 71 in the station is connected into the hydrogen storage tank 81, the outlet of the hydrogen storage tank is connected with the hydrogen compressor 91, the outlet of the hydrogen compressor 91 is connected into the external hydrogen conveying pipeline, and hydrogen is conveyed to user enterprises. The oxygen pipeline 72 in the station is connected to the oxygen storage tank 82, the outlet of the oxygen storage tank 82 is connected to the oxygen compressor 92, and the outlet of the oxygen compressor 92 is connected to the external oxygen pipeline to deliver oxygen to the user enterprises. A check valve is arranged before a gas pipe network of the gas purification device of each photovoltaic direct-current hydrogen production module is connected to the gas transmission pipeline 7, so that hydrogen is prevented from flowing back to the front-section hydrogen production section from the gas storage tank. In this case the pressure of hydrogen or oxygen is equal to the pressure of the gas at the outlet of the purification apparatus.
The gas-liquid separation and purification device 25, the pipe valve, the liquid pump, the compressor 9, the system controller and the like in the system are powered by a power grid, so that the power supply reliability of auxiliary equipment is ensured. In order to meet the power supply reliability of the auxiliary equipment, the UPS power supply is configured.
In other embodiments, the photovoltaic direct current off-grid electrical hydrogen production system 100 can be configured without the oxygen storage tank 82 and the oxygen compressor 92, and the oxygen is discharged to the air at the high position through a pipeline at the oxygen outlet of the gas purification device in the case of the double production without oxygen users. This arrangement can reduce the equipment investment for the oxygen storage tank 82 and the oxygen compressor 92.
Referring to fig. 5, a plurality of electrolytic water hydrogen production tanks 24 in the photovoltaic direct current hydrogen production array share one set of gas-liquid separation and purification equipment, so that the centralized separation of alkali liquor and gas mixture, the centralized supplement of raw material water and the centralized control of alkali liquor temperature are realized, the stability of alkali liquor temperature control can be improved, and the purity and pressure stability of a gas outlet are improved by adopting large-scale gas purification equipment.
The hydrogen and alkali liquor mixture from the multiple water electrolysis hydrogen production tanks 24 in the photovoltaic direct current hydrogen production array enters a hydrogen and alkali liquor separation device 3, the separated hydrogen enters a hydrogen purification device 4, and the rear part of the hydrogen purification device is connected with a hydrogen storage tank 81, a hydrogen compressor 91 and an external hydrogen conveying pipeline. Oxygen and alkali liquor mixtures from a plurality of water electrolysis hydrogen production tanks 24 in the photovoltaic direct current hydrogen production array enter an oxygen and alkali liquor separation device 5, the separated oxygen enters an oxygen purification device 6, and the rear part of the oxygen purification device is connected with an oxygen storage tank 82, an oxygen compressor 92 and an external oxygen pipeline. The chilled water pipeline 14 in the photovoltaic direct current hydrogen production array supplies chilled water for the two gas purification devices, the cooling water pipeline 15 supplies cooling water for the two gas-liquid separation devices, and the cooling water is used for cooling alkali liquor in the gas-liquid separation devices so as to meet the requirement of the temperature of the alkali liquor at the inlet of the electrolyzed water hydrogen production tank 24. The alkali liquor from the two gas-liquid separation devices in the photovoltaic direct current hydrogen production array enters the electrolytic water hydrogen production tank 24 through the alkali liquor pipeline 16, the water pipeline 10 is connected with the alkali liquor pipeline 16, and the raw material water is supplemented according to the water consumption of electrolytic hydrogen production in the electrolytic water hydrogen production tank 24.
The photovoltaic direct current hydrogen production module 1 adopts the capacity optimization configuration technology of the photovoltaic array 21 and the water electrolysis hydrogen production tank 24, and improves the utilization rate of the electric hydrogen production equipment. By means of an optimized configuration scheme, one DC/DC converter 23 is used to connect the photovoltaic array 21 and the electrolyzed water hydrogen production tank 24 by adopting a common direct current bus principle, the situation that equipment in links such as DC/DC boosting, power transmission, DC/DC voltage reduction and the like needs to be added in a photovoltaic direct current hydrogen production system is avoided, and the investment cost of a direct current link is reduced.
Optionally, the gas pipeline collection technical scheme can also adopt a photovoltaic direct current hydrogen production module 1, and then is connected with a gas storage tank. The gas storage tank is transported by a tank truck, collected to a place and then connected to a large-capacity hydrogen transportation pipeline by a compressor 9. In the present embodiment, the photovoltaic array 21, the junction box 22, and the electrolytic bath are connected by one DC/DC converter 23, or the photovoltaic array 21, the junction box 22, the DC/DC boost converter, the DC/DC buck converter, and the electrolytic bath may be connected. The gas-liquid separation device of the water electrolysis hydrogen production tank 24 is of the type that the alkali liquor of the hydrogen alkali-liquid separator and the oxygen alkali-liquid separator flows together and then enters the electrolytic tank again. The technical scheme of the embodiment is also suitable for the gas-liquid separation device which is provided with the type that the gas-liquid separators on the hydrogen side and the oxygen side circulate independently and the alkali liquor does not flow together after separation.
The capacity optimization configuration method of the photovoltaic array 21 and the electrolytic water hydrogen production tank 24 of the photovoltaic direct current hydrogen production module 1 comprises the following steps:
the first step is as follows: and determining the direct current bus voltage U of the photovoltaic array 21, wherein 1000V and 1500V can be selected.
The second step is that: determining the voltage of the output side of the DC/DC converter 23, namely the voltage U of a direct current bus of the water electrolysis hydrogen production tank 24 1 And further determines the power P of the electrolytic water hydrogen production tank 24. The closer the transformation ratio of the DC/DC converter 23 is to 1, the higher the conversion efficiency. The DC/DC converter 23 may have a transformation ratio of 0.2 to 5, and preferably has a transformation ratio of 0.5 to 2 to ensure the transformation efficiency. The voltage of the direct current bus of the water electrolysis hydrogen production tank 24 can be adjusted by adjusting the number of the electrolysis small chambers, and can also be realized by connecting the water electrolysis hydrogen production tanks 24 in series. The power of the electrolytic water hydrogen production tank 24 is direct currentThe electrode surface current is pressed, and the electrode surface current can be optimized by selecting electrodes with different areas and different types of electrolytic catalysts, so that the power of the water electrolysis hydrogen production tank 24 is optimized.
P＝U 1 *I
Wherein, P is the power of the electrolytic water hydrogen production tank 24, and the unit kW; u shape 1 Is the direct current bus voltage of the electrolytic water hydrogen production tank 24, unit V; i is the surface current of the electrolytic water hydrogen production tank 24, and the unit is A.
The third step: and determining the component capacity of the photovoltaic array 21 according to the power regulation range of the electrolytic water hydrogen production tank 24. The large-scale alkaline water electrolysis hydrogen production tank 24 adopts a porous diaphragm, so that the content of hydrogen impurities is increased under a low-load working condition, and the electrical hydrogen production efficiency and the equipment safety are influenced, so that the large-scale alkaline water electrolysis hydrogen production tank 24 has the lowest operation power. The power regulation range of the electrolytic water hydrogen production tank 24 can be 30-110%, in a photovoltaic direct current hydrogen production array which shares a gas-liquid separation device and a gas purification device, the shutdown condition of part of the electrolytic water hydrogen production tanks 24 can be realized by adopting the centralized control of the temperature of alkali liquor, and the normal operation of other electrolytic water hydrogen production tanks 24 can improve the power regulation range of an electric hydrogen production system in the array. The power regulation range [ u1 × P, u2 × P ] of the electrohydrogen production system in the photovoltaic direct current hydrogen production module 1 or array, wherein u1 and u2 are the ratio of the lowest operation power and the maximum operation power of the electrolyzer respectively.
u2*P＝P s
Wherein, P s The peak generated power of the photovoltaic array 21 is in kWp.
And determining the capacity of the photovoltaic array 21 according to the fact that the maximum operating power of the electrical hydrogen production system is equal to the peak power generation power of the photovoltaic array 21, and realizing that the electrical hydrogen production system completely consumes the photovoltaic power generation. Because the time of the photovoltaic array 21 in the peak power generation is short, the photovoltaic array is consumed in a short-time overpower operation mode of the hydrogen production system, and the utilization rate of the hydrogen production equipment can be effectively improved.
The capacity optimization configuration of the photovoltaic direct current hydrogen production module 1 in this embodiment may be: and determining the voltage of the water electrolysis hydrogen production tank 24 according to the optimal transformation ratio according to 1500V direct current DC/DC, wherein the direct current voltage of the water electrolysis hydrogen production tank 24 is 750V when the transformation ratio is 2. The surface current of the water electrolysis hydrogen production tank 24 is 8000A, and the power of the water electrolysis hydrogen production tank 24 is 6000 kW. The power regulation range of the water electrolysis hydrogen production tank 24 is 30-110% P by adopting a flexible regulation and control technology, and the power generation capacity of the photovoltaic array 21 is 6600kWp according to the condition that the rated power of the water electrolysis hydrogen production tank 24 is equal to the peak power of the photovoltaic array 21.
The present embodiment also provides a method for regulating the photovoltaic dc off-grid hydrogen production system 100, which includes: the system controller determines an optimized operation mode through data processing by acquiring equipment operation data, and issues a control instruction to the response equipment to realize the optimized dispatching control of the photovoltaic direct-current off-grid hydrogen production system 100.
Aiming at the integrated system of the photovoltaic direct current hydrogen production module 1, the system regulation strategy is to regulate the operating power of the compressor 9 according to the outlet pressure and flow of the hydrogen storage tank 81 or the oxygen storage tank 82, so as to ensure that the pressure of the gas entering the gas transmission pipeline 7 meets the requirement of the gas transmission pipeline 7. The outlet pressure of the hydrogen storage tank 81 is the same as that of the oxygen storage tank 82, so that the pressure difference between the hydrogen side and the oxygen side in the water electrolysis hydrogen production tank 24 is avoided, the gas impurity content is improved, and the service life of the diaphragm is shortened. The photovoltaic array 21, the DC/DC converter 23, the water electrolysis hydrogen production tank 24, the gas-liquid separation device and the gas purification equipment in the photovoltaic direct current hydrogen production module 1 adopt an adaptive control strategy, and the maximized photovoltaic power generation hydrogen production is realized.
Because the photovoltaic direct current hydrogen production array shares a gas-liquid separation device and a gas purification device, the self-adaptive control strategy in the array is restricted by a sharing auxiliary machine:
p down ＜＜p h ＜＜p up
p down ＜＜p o ＜＜p up
p h ＝p o
wherein p is down 、p up Respectively a lower gas pressure limit value and an upper gas pressure limit value of the inlet of the compressor 9 in kPa; p is a radical of h 、p o Outlet gas pressures in kPa for the hydrogen reservoir 81 and the oxygen reservoir 82, respectively.
The self-adaptive control method of the photovoltaic direct-current hydrogen production array comprises the following steps:
controlling the running power of a liquid pump connected to an external water pipeline 10 according to the liquid level of a water storage tank 11 to ensure that the water quantity in the water storage tank 11 is sufficient, and adjusting the running power of the liquid pump at the outlet of the water storage tank 11 according to the water consumption of raw material water, cooling water and chilled water of a system; the control of the photovoltaic direct current hydrogen production module 1 controls the DC/DC converter 23 according to the power generation power of the photovoltaic array 21, so that the power consumption power of the electrolyzed water hydrogen production tank 24 is ensured to track the power generation power, and the maximum consumption of the power generation of the photovoltaic array 21 is realized.
The control strategy of the gas-liquid separation device and the purification equipment behind the electrolytic water hydrogen production tank 24 in the photovoltaic direct current hydrogen production module 1 is as follows: according to the operation power of the electrolytic water hydrogen production tank 24, the flow of the alkali liquor, the flow of the cooling water and the flow of the raw material water in the gas-liquid separation device are adjusted, the temperature of the alkali liquor at the inlet of the electrolytic water hydrogen production tank 24 is ensured to be 65-70 ℃, the temperature range of the alkali liquor at the outlet of the electrolytic water hydrogen production tank 24 is ensured to be 80-90 ℃, the pressure of the outlets at the oxygen side and the hydrogen side in the gas-liquid separator needs to be controlled by a valve so as to ensure that the pressure of the outlets at the two sides is the same, and the outlet of the purification device automatically adjusts the pressure of the outlet gas according to the pressure of a gas pipeline in a field.
The operation states of a plurality of electrolyzed water hydrogen production grooves 24 in the photovoltaic direct current hydrogen production array track the power generation power of the photovoltaic arrays 21 which are respectively connected, the operation working points of different electrolyzed water hydrogen production grooves 24 are different, the temperature of the alkali liquor at the outlet is different, but the temperature of the converged alkali liquor after the hydrogen side and the oxygen side gas-liquid separator enters the electrolyzed water hydrogen production grooves 24 again is the same.
The photovoltaic direct current off-grid electricity hydrogen production system 100 and the capacity optimization configuration method and the self-adaptive control method thereof provided by the embodiment have the beneficial effects that:
1. the gas pipeline replaces a direct current cable, the investment of the direct current cable is saved, the photovoltaic direct current hydrogen production module 1 can be flexibly configured, and meanwhile, the photovoltaic large-scale development and absorption in remote areas such as deserts, gobi, deserts and the like are suitable for combining the outward transportation development trend of the hydrogen pipeline 71 in a large-scale new energy base;
2. the water conveying pipeline 10 and the gas conveying pipeline 7 are adopted to replace the traditional power transmission line, and the combined optimization of hydrogen production, hydrogen storage and hydrogen conveying is adopted, so that the utilization rate of the gas conveying pipeline 7 is improved, and the problems of low utilization rate of the power transmission line caused by low utilization hours of photovoltaic power generation are solved;
3. the photovoltaic direct current hydrogen production module 1 adopts the capacity optimization configuration technology of the photovoltaic array 21 and the electrolyzed water hydrogen production tank 24, improves the utilization rate of the electric hydrogen production equipment, adopts a common direct current bus principle to connect the photovoltaic array 21 and the electrolyzed water hydrogen production tank 24 by adopting an optimization configuration scheme and a DC/DC converter 23, avoids the need of adding devices of links such as DC/DC boosting, power transmission, DC/DC voltage reduction and the like in a photovoltaic direct current hydrogen production system, and reduces the investment cost of a direct current link;
4. according to the self-adaptive control method of the photovoltaic direct current hydrogen production module 1 or array, the DC/DC converter 23 is controlled to realize that the water electrolysis hydrogen production tank 24 operates at the optimal efficiency point according to the power generation power of the photovoltaic array 21, so that the electrolysis efficiency of the photovoltaic direct current hydrogen production module 1 or array is improved, the photovoltaic electricity waste is reduced, and the hydrogen and oxygen yield is improved;
5. shared gas-liquid separation and gas purification equipment is used in the photovoltaic direct-current hydrogen production array, so that the cost of the gas-liquid separation and purification device is reduced.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a photovoltaic direct current leaves net electricity hydrogen manufacturing system, a serial communication port, photovoltaic direct current leaves net electricity hydrogen manufacturing system includes photovoltaic direct current hydrogen manufacturing module (1), gas transmission pipeline (7), gas storage tank system (8) and compressor (9), photovoltaic direct current hydrogen manufacturing module (1) passes through gas transmission pipeline (7) are collected gas storage tank system (8), the exit linkage of gas storage tank system (8) compressor (9), wherein, photovoltaic direct current hydrogen manufacturing module (1) is including photovoltaic array (21), collection flow box (22), DC/DC converter (23), electrolysis water hydrogen manufacturing groove (24) and gas-liquid separation purification device (25) that connect gradually.
2. The photovoltaic direct-current off-grid electrical hydrogen production system according to claim 1, wherein the photovoltaic array (21), the header box (22), the DC/DC converter (23) and the electrolyzed water hydrogen production tank (24) which are connected in sequence form a hydrogen production unit (2), and a plurality of hydrogen production units (2) share one gas-liquid separation and purification device (25).
3. The photovoltaic direct-current off-grid electrical hydrogen production system according to claim 1, comprising a plurality of photovoltaic direct-current hydrogen production modules (1), wherein the plurality of photovoltaic direct-current hydrogen production modules (1) are connected in parallel and then collected to the gas storage tank system (8) through the gas transmission pipeline (7).
4. The photovoltaic direct current off-grid electrical hydrogen production system according to claim 1, comprising a plurality of photovoltaic direct current hydrogen production modules (1), wherein a plurality of photovoltaic direct current hydrogen production modules (1) share auxiliary equipment;
in each photovoltaic direct current hydrogen production module (1), the photovoltaic array (21), the header box (22), the DC/DC converter (23) and the electrolytic water hydrogen production tank (24) which are sequentially connected form a hydrogen production unit (2), and the hydrogen production units (2) share one gas-liquid separation and purification device (25).
5. The pv dc off-grid electrical hydrogen production system according to claim 1, wherein the gas transmission pipeline (7) comprises a hydrogen pipeline (71) and an oxygen pipeline (72), the gas storage tank system (8) comprises a hydrogen storage tank (81) and an oxygen storage tank (82), and the compressor (9) comprises a hydrogen compressor (91) and an oxygen compressor (92);
the gas-liquid separation and purification device (25) is connected to the hydrogen storage tank (81) through the hydrogen pipeline (71), the hydrogen storage tank (81) is connected to the hydrogen compressor (91), the hydrogen compressor (91) is connected to an external hydrogen conveying pipeline, the gas-liquid separation and purification device (25) is connected to the oxygen storage tank (82) through the oxygen pipeline (72), the oxygen storage tank (82) is connected to the oxygen compressor (92), and the oxygen compressor (92) is connected to an external oxygen conveying pipeline.
6. The photovoltaic direct current off-grid electrical hydrogen production system according to claim 1, further comprising a water conduit (10), a water storage tank (11), a first liquid pump (12), and a second liquid pump (13);
the electrolytic water hydrogen production tank (24) is connected to the first liquid pump (12) through the water pipeline (10), the first liquid pump (12) is connected to the water storage tank (11), and the water storage tank (11) is connected to an external water pipeline (10) through the second liquid pump (13).
7. The photovoltaic direct current off-grid electrical hydrogen production system according to claim 5, wherein the gas-liquid separation and purification device (25) comprises a hydrogen-alkali separation device (3), a hydrogen purification apparatus (4), an oxygen-alkali separation device (5) and an oxygen purification apparatus (6);
the hydrogen and alkali liquor mixture from the water electrolysis hydrogen production tank (24) enters the hydrogen and alkali liquor separation device (3), the separated hydrogen enters the hydrogen purification equipment (4), and the rear part of the hydrogen purification equipment (4) is connected with the hydrogen storage tank (81), the hydrogen compressor (91) and the external hydrogen conveying pipeline; oxygen and alkali liquor mixture from the water electrolysis hydrogen production tank (24) enters the oxygen and alkali liquor separation device (5), the separated oxygen enters the oxygen purification equipment (6), and the oxygen storage tank (82), the oxygen compressor (92) and the external oxygen transmission pipeline are connected behind the oxygen purification equipment (6).
8. The photovoltaic direct-current off-grid electrical hydrogen production system according to claim 7, further comprising a chilled water pipeline (14), a cooling water pipeline (15), and an alkali liquor pipeline (16);
freezing water pipeline (14) does hydrogen purification equipment (4) with oxygen purification equipment (6) supply refrigerated water, cooling water pipeline (15) do hydrogen alkali lye separator (3) with oxygen alkali lye separator (5) provide the cooling water, hydrogen alkali lye separator (3) with oxygen alkali lye separator (5) pass through alkali liquor pipeline (16) are connected to water pipeling (10) respectively, water pipeling (10) are connected to brineelectrolysis hydrogen manufacturing groove (24), hydrogen alkali lye separator (3) and the alkali liquor that oxygen alkali lye separator (5) came out, pass through alkali liquor pipeline (16) enter into brineelectrolysis hydrogen manufacturing groove (24), water pipeling (10) basis electrolyzation hydrogen manufacturing water consumption supplyes raw materials water in brineelectrolysis hydrogen manufacturing groove (24).
9. A capacity optimization configuration method of a photovoltaic direct-current off-grid hydrogen production system is applied to the photovoltaic direct-current off-grid hydrogen production system of claim 1, and comprises the following steps:
the first step is as follows: determining a direct current bus voltage U of the photovoltaic array (21);
the second step is that: determining the output-side voltage U of the DC/DC converter (23) 1 Further determining the power P of the water electrolysis hydrogen production tank (24);
the third step: and determining the component capacity of the photovoltaic array (21) according to the power regulation range of the water electrolysis hydrogen production tank (24).
10. An adaptive control method of a photovoltaic direct-current off-grid hydrogen production system, wherein the adaptive control method of the photovoltaic direct-current off-grid hydrogen production system is applied to the photovoltaic direct-current off-grid hydrogen production system of claim 1, and the method comprises the following steps:
according to the operating power of the water electrolysis hydrogen production tank (24), regulating the flow of alkali liquor, the flow of cooling water and the flow of raw material water in a gas-liquid separation device, and ensuring that the temperature of the alkali liquor at the inlet of the water electrolysis hydrogen production tank (24) is 65-70 ℃ and the temperature range of the alkali liquor at the outlet of the water electrolysis hydrogen production tank (24) is 80-90 ℃;
and controlling the valve to ensure that the outlet pressure of the oxygen side and the outlet pressure of the hydrogen side in the gas-liquid separator are the same, and automatically adjusting the outlet gas pressure of the purifying equipment according to the pressure of a gas pipeline in the field.
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