CN215528622U - Combined operation system for electrolytic hydrogen production by utilizing wind power, photovoltaic and solid oxide - Google Patents

Abstract

The utility model discloses a combined operation system for producing hydrogen by utilizing wind power, photovoltaic and solid oxide electrolysis, which comprises a steam generation unit; the output end of the power distribution network is respectively and electrically connected with the solid oxide electrolytic cell pile unit and the steam generation unit; the steam outlet of the resistance-type electric heating boiler is connected with the steam inlet of the solid heat storage boiler, and the steam outlet of the solid heat storage boiler is communicated with the steam inlet of the solid oxide electrolytic cell pile unit. The advantages are that: clean electric energy is provided for the solid oxide electrolytic cell pile unit and the steam generating unit through the wind power generating unit and the photovoltaic generating unit, and the steam generating unit provides clean heat energy required by electrolytic reaction for the solid oxide electrolytic cell pile unit; the coupling of new energy sources such as wind power, photovoltaic and the like and a high-temperature solid oxide electrolytic hydrogen production technology is realized, a technical route combining the high-temperature solid oxide electrolytic hydrogen production technology and non-nuclear energy is created, the resource utilization rate is improved, and the problem of wind abandoning and electricity limiting in the three north areas of China is solved.

Description

Combined operation system for electrolytic hydrogen production by utilizing wind power, photovoltaic and solid oxide

The technical field is as follows:

the utility model relates to the technical field of hydrogen production by utilizing clean energy, in particular to a combined operation system for hydrogen production by utilizing wind power, photovoltaic and solid oxide electrolysis.

Background art:

with the continuous expansion of wind power and photovoltaic scales in the three north areas in recent years, under the influence of wind power output, photovoltaic output characteristics and power load characteristics, wind abandoning and light abandoning electricity limiting phenomena exist in wind power plants and photovoltaic power stations in most areas, and due to the fact that a power grid lacks of peak regulation means such as energy storage facilities, the output of a wind power unit and a photovoltaic module has to be limited, and obvious influence is generated on the operation hours of the wind power and the photovoltaic.

The prior water electrolysis hydrogen production energy storage technology comprises an alkaline electrolysis technology, a solid polymer electrolysis technology (SPE) and a solid oxide electrolysis technology (SOEC); the alkaline electrolysis technology is mature, the cost is the lowest, large-scale hydrogen production application is realized, but the efficiency is low, although the SPE electrolysis technology is improved to a certain extent compared with the alkaline electrolysis technology, the system efficiency is still not high after the loss of auxiliary equipment is taken into account, and the SPE electrolysis technology is not an ideal scheme; the high-temperature SOEC technology works at about 800 ℃, compared with the alkaline electrolysis technology and the SPE electrolysis technology which work at about 80 ℃, the electrolysis efficiency is greatly improved, and the technology is a water electrolysis hydrogen production technology with great prospect in the three technologies.

Because the SOEC working temperature is about 800-950 ℃, a high temperature gas cooled reactor (HTGR) is generally adopted to provide electric energy and high temperature heat energy at present, and an electric energy and heat energy providing system of the high temperature gas cooled reactor is a common research direction in China and abroad at present, but deep research on renewable energy sources such as wind energy, solar energy and the like and a high temperature solid oxide electrolytic cell hydrogen production coupling technology is not developed.

In view of the current situation of large-scale electricity abandonment of renewable energy sources, the high efficiency of hydrogen production by water electrolysis through high-temperature SOEC, and the multi-field application value of hydrogen which can be used as a clean fuel and a chemical raw material, the popularization of the coupling technology of hydrogen energy through water electrolysis through renewable energy sources and high-temperature SOEC brings wide application prospects.

The utility model has the following contents:

the utility model aims to provide a combined operation system for producing hydrogen by utilizing wind power, photovoltaic and solid oxide electrolysis, which can convert electric energy of rich wind power and photovoltaic of a power grid into heat energy for storage and provide a peak clipping and valley filling means for the power grid; and a brand new energy source mode for producing hydrogen by electrolyzing the solid oxide electrolytic cell is provided, namely clean electric energy and heat energy are provided for the solid oxide electrolytic cell by utilizing wind energy and solar energy combined with electric heat storage equipment.

The utility model is implemented by the following technical scheme: a combined operation system for electrolytic hydrogen production by utilizing wind power, photovoltaic and solid oxide comprises a wind power generation unit, a photovoltaic power generation unit, a solid oxide electrolytic cell pile unit, a steam generation unit, a heat recovery and utilization unit, a hydrogen storage tank, an oxygen storage tank, a pure water preparation unit and a power distribution network; the output end of the wind power generation unit and the output end of the photovoltaic power generation unit are respectively and electrically connected with the input end of the power distribution network, and the output end of the power distribution network is respectively and electrically connected with the power utilization equipment of the solid oxide electrolytic cell pile unit and the power utilization equipment of the steam generation unit; an oxygen outlet of the solid oxide electrolytic cell stack unit is communicated with the oxygen storage tank through an oxygen outlet main pipe, and a hydrogen outlet of the solid oxide electrolytic cell stack unit is communicated with the hydrogen storage tank through a hydrogen outlet main pipe; the steam generating unit comprises a solid heat storage boiler and a resistance type electric heating boiler; the water outlet of the pure water preparation unit is communicated with the water inlet of the resistance-type electric heating boiler, the steam outlet of the resistance-type electric heating boiler is communicated with the steam inlet of the solid heat storage boiler through a pipeline, and the steam outlet of the solid heat storage boiler is communicated with the steam inlet of the solid oxide electrolytic cell pile unit through a steam inlet main pipe.

Furthermore, a gas flow control valve is arranged on a pipeline between a steam outlet of the resistance type electric heating boiler and a steam inlet of the solid heat storage boiler.

Further, the solid oxide electrolytic cell stack unit comprises a solid oxide electrolytic cell, an electrolytic hydrogen production transformer and a rectification inverter; the input end of the electrolysis hydrogen production transformer is electrically connected with the output end of the power distribution network, the output end of the electrolysis hydrogen production transformer is electrically connected with the input end of the rectifier inverter, and the output end of the rectifier inverter is electrically connected with the solid oxide electrolytic cell.

Further, the hydrogen and water vapor separator further comprises a stop valve and a check valve which are connected between the hydrogen outlet main pipe and the water vapor inlet main pipe in series.

Further, the electric heating system also comprises an electric heating system transformer and a boiler control cabinet; the input end of the electric heating system transformer is electrically connected with the output end of the power distribution network, the output end of the electric heating system transformer is electrically connected with the input end of the boiler control cabinet, and the output end of the boiler control cabinet is electrically connected with the resistance type electric heating boiler and the solid heat storage boiler respectively.

Further, the heat recovery and utilization unit comprises a first preheater and a second preheater; an oxygen outlet of the oxygen outlet header pipe is communicated with an air inlet of the first preheater, and an air outlet of the first preheater is communicated with the oxygen storage tank through a pipeline; a hydrogen outlet of the hydrogen outlet header pipe is communicated with an air inlet of the second preheater, and an air outlet of the second preheater is communicated with the hydrogen storage tank through a pipeline; the water outlet of the pure water preparation unit is communicated with the water inlet of the first preheater, the water outlet of the first preheater is communicated with the water inlet of the second preheater, and the water outlet of the second preheater is communicated with the water inlet of the resistance type electric heating boiler.

Further, the device also comprises a first gas-water separator and a second gas-water separator; the gas outlet of the first preheater is communicated with the gas inlet of the first gas-water separator, and the gas outlet of the first gas-water separator is communicated with the gas inlet of the oxygen storage tank; the gas outlet of the second preheater is communicated with the gas inlet of the gas-water second separator, and the gas outlet of the gas-water second separator is communicated with the gas inlet of the hydrogen storage tank; and the condensed water outlet of the first gas-water separator and the condensed water outlet of the second gas-water separator are communicated with the water outlet of the pure water preparation unit.

Further, the pure water preparation unit comprises a raw water storage tank and a pure water preparation device, and a water outlet of the raw water storage tank is communicated with a water inlet of the pure water preparation device.

Further, the solid heat storage boiler comprises a base, a saturated steam inlet header pipe, a superheated steam outlet header pipe and a heat insulation furnace shell fixed at the top of the base; a heat storage brick layer is built in the heat insulation furnace shell, and a plurality of electric heating wires are embedded in the heat storage brick layer; a plurality of water vapor heating pipelines are arranged in the heat storage brick layer in a penetrating manner, the saturated water vapor inlet header pipe is communicated with the inlet of each water vapor heating pipeline, and the outlet of each water vapor heating pipeline is communicated with the superheated water vapor outlet header pipe; and the saturated steam inlet main pipe is provided with a high-temperature fan.

The utility model has the advantages that: clean electric energy is provided for the solid oxide electrolytic cell pile unit and the steam generating unit through the wind power generating unit and the photovoltaic power generating unit, the steam generating unit provides clean heat energy required by electrolytic reaction for the solid oxide electrolytic cell pile unit, namely, the electric energy and the heat energy required by the solid oxide electrolytic cell pile unit are both provided by new energy; compared with the existing high-temperature gas-cooled reactor, the utility model is more beneficial to saving energy and fully utilizing the renewable energy.

The utility model realizes the heat recovery and cyclic utilization of hydrogen and oxygen generated by electrolytic reaction through the heat recovery and utilization unit, and can convert electric energy of abundant wind power and photovoltaic of a power grid into heat energy for storage by utilizing the resistance type electric heating boiler and the solid heat storage boiler, and provides a novel energy source mode for the electrolytic hydrogen production of the solid oxide electrolytic cell.

Description of the drawings:

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of the solid heat storage boiler according to the present invention.

The parts in the drawings are numbered as follows: wind power generation unit 1, wind power generator 1.1, wind power generation transformer 1.2, photovoltaic power generation unit 2, photovoltaic module 2.1, inverter 2.2, photovoltaic power generation transformer 2.3, solid oxide electrolytic cell pile unit 3, electrolytic hydrogen production transformer 3.1, rectifier inverter 3.2, solid oxide electrolytic cell 3.3, electrolytic cell cathode 3.31, electrolytic cell anode 3.32, electrolyte 3.33, hydrogen gas outlet header pipe 3.34, water vapor inlet header pipe 3.35, oxygen gas outlet header pipe 3.36, stop valve 3.4, check valve 3.5, steam generation unit 4, electric heating system transformer 4.1, boiler control cabinet 4.2, resistance type electric heating boiler 4.3, heat storage boiler 4.4, base 4.41, heat insulation furnace shell 4.42, brick layer 4.43, electric heating wire 4.44, water vapor heating pipeline 4.45, saturated water vapor inlet header pipe 4.46, superheated water vapor outlet header pipe 4.47, high temperature fan 4.48, gas flow control valve 4.5, and heat recovery unit utilizing heat flow, The system comprises a first preheater 5.1, a second preheater 5.2, a first gas-water separator 5.3, a second gas-water separator 5.4, a hydrogen storage tank 6, an oxygen storage tank 7, a pure water preparation unit 8, a raw water storage tank 8.1, a pure water preparation unit 8.2 and a power distribution network 9.

The specific implementation mode is as follows:

as shown in fig. 1 and fig. 2, the present embodiment provides a combined operation system for producing hydrogen by electrolysis of wind power, photovoltaic and solid oxide, which includes a wind power generation unit 1, a photovoltaic power generation unit 2, a solid oxide electrolytic cell stack unit 3, a steam generation unit 4, a heat recovery and utilization unit 5, a hydrogen storage tank 6, an oxygen storage tank 7, a pure water preparation unit 8 and a power distribution network 9.

The output end of the wind power generation unit 1 and the output end of the photovoltaic power generation unit 2 are respectively and electrically connected with the input end of the power distribution network 9, the wind power generation unit 1 comprises a wind power generator 1.1 and a wind power generation transformer 1.2, the output end of the wind power generator 1.1 is electrically connected with the input end of the wind power generation transformer 1.2, and the output end of the wind power generation transformer 1.2 is electrically connected with the input end of the power distribution network 9; the power generated by the wind power generation unit 1 is supplied to a power distribution network 9; the photovoltaic power generation unit 2 comprises a photovoltaic module 2.1, an inverter 2.2 and a photovoltaic power generation transformer 2.3; the output end of the photovoltaic module 2.1 is electrically connected with the input end of the inverter 2.2, the output end of the inverter 2.2 is electrically connected with the input end of the photovoltaic power generation transformer 2.3, the output end of the photovoltaic power generation transformer 2.3 is electrically connected with the input end of the power distribution network 9, and the electric energy generated by the photovoltaic power generation unit 2 is supplied to the power distribution network 9.

The solid oxide electrolytic cell pile unit 3 comprises a solid oxide electrolytic cell 3.3, an electrolytic hydrogen production transformer 3.1 and a rectification inverter 3.2; the output end of the power distribution network 9 is electrically connected with the input end of an electrolytic hydrogen production transformer 3.1 of the solid oxide electrolytic cell pile unit 3, the output end of the electrolytic hydrogen production transformer 3.1 is electrically connected with the input end of a rectifier inverter 3.2, the output end of the rectifier inverter 3.2 is electrically connected with a solid oxide electrolytic cell 3.3, wherein the positive circuit of the rectifier inverter 3.2 is electrically connected with an electrolytic cell anode 3.32 of the solid oxide electrolytic cell 3.3, and the negative circuit of the rectifier inverter 3.2 is electrically connected with an electrolytic cell cathode 3.31 of the solid oxide electrolytic cell 3.3; after the new energy power from the wind power generation unit 1 and the photovoltaic power generation unit 2 is transformed by an electrolytic hydrogen production transformer 3.1, alternating current is converted into direct current through a rectifier inverter 3.2, and the direct current is introduced to an electrode of a solid oxide electrolytic cell 3.3 for electrolytic reaction; a plurality of solid oxide electrolytic cells 3.3 form a pile through a connector, the connector has two functions, one is gas for separating a cathode chamber and an anode chamber, the other is current transmission between electrolytic cell units, and the currently used connector material mainly comprises LaCrO₃Two types of base ceramic materials and high-temperature alloy materials; the cathode 3.31 material of the solid oxide electrolytic cell 3.3 adopts Ni/YSZ porous metal ceramic, the anode 3.32 material of the electrolytic cell is mainly perovskite oxide material, the middle electrolyte 3.33 adopts YSZ oxygen ion conductor, after certain direct current voltage is applied to the electrodes at two sides of the solid oxide electrolytic cell 3.3, water molecules are electrolyzed and decomposed at the cathode 3.31 of the electrolytic cell to generate hydrogen and oxygen ions, the oxygen ions pass through the electrolyte 3.33 to reach the anode 3.32 of the electrolytic cell, and electrons are lost at the anode 3.32 of the electrolytic cell to generate oxygen; still including the stop valve 3.4 and the check valve 3.5 of concatenating between the export of hydrogen gas outlet manifold 3.34 and the export of steam inlet manifold 3.35, can effectively prevent through check valve 3.5 that the steam in the steam inlet manifold 3.35 from backflowing to in the hydrogen gas outlet manifold 3.34, and through control stop valve 3.4, can guarantee that a small amount of hydrogen in the hydrogen gas outlet manifold 3.34 gets into the steamIn the steam inlet main pipe 3.35, the steam mixed with a small amount of hydrogen enters from the cathode 3.31 of the electrolytic cell, and the purpose of hydrogen mixing is to ensure the reducing atmosphere of the cathode of the electrolytic cell and prevent the cathode material Ni from being oxidized.

The steam generating unit 4 comprises an electric heating system transformer 4.1, a boiler control cabinet 4.2, a solid heat storage boiler 4.4 and a resistance type electric heating boiler 4.3; the input end of an electric heating system transformer 4.1 is electrically connected with the output end of a power distribution network 9, the output end of the electric heating system transformer 4.1 is electrically connected with the input end of a boiler control cabinet 4.2, and the output end of the boiler control cabinet 4.2 is respectively electrically connected with a resistance type electric heating boiler 4.3 and a solid heat storage boiler 4.4; the electric energy generated by the wind power generation unit 1 and the photovoltaic power generation unit 2 is supplied to the resistance type electric heating boiler 4.3 and the solid heat storage boiler 4.4 to generate heat energy, namely the steam generation unit 4 converts the electric energy generated by wind power generation and photovoltaic power generation into heat energy, wherein the heat storage medium in the solid heat storage boiler 4.4 can store the heat energy; thereby, clean power is supplied to the solid oxide electrolytic cell stack unit 3 and the steam generation unit 4 through the wind power generation unit 1 and the photovoltaic power generation unit 2.

A hydrogen outlet header pipe 3.34 and a water vapor inlet header pipe 3.35 are communicated with the cathode 3.31 of the solid oxide electrolytic cell 3.3, and an oxygen outlet header pipe 3.36 is communicated with the anode 3.32 of the electrolytic cell; an oxygen outlet of the oxygen outlet header pipe 3.36 is communicated with an air inlet of a first preheater 5.1 of the heat recovery and utilization unit 5, an air outlet of the first preheater 5.1 is communicated with the oxygen storage tank 7 through a pipeline, an air outlet of the first preheater 5.1 is communicated with an air inlet of a first gas-water separator 5.3, and an air outlet of the first gas-water separator 5.3 is communicated with an air inlet of the oxygen storage tank 7; a hydrogen outlet of the hydrogen outlet header pipe 3.34 is communicated with an air inlet of a second preheater 5.2 of the heat recovery and utilization unit 5, an air outlet of the second preheater 5.2 is communicated with the hydrogen storage tank 6 through a pipeline, an air outlet of the second preheater 5.2 is communicated with an air inlet of a gas-water second separator 5.4, and an air outlet of the gas-water second separator 5.4 is communicated with an air inlet of the hydrogen storage tank 6; the pure water preparation unit 8 comprises a raw water storage tank 8.1 and a pure water preparation device 8.2, a water outlet of the raw water storage tank 8.1 is communicated with a water inlet of the pure water preparation device 8.2, and the pure water preparation device 8.2 selects EDI deionized water equipment or reverse osmosis pure water equipment to prepare raw material pure water; the water outlet of the pure water preparation device 8.2 is communicated with the water inlet of the first preheater 5.1, and the water outlet of the first preheater 5.1 is communicated with the water inlet of the second preheater 5.2; the first preheater 5.1 and the second preheater 5.2 are plate heat exchangers; oxygen generated by electrolysis of the solid oxide electrolytic cell 3.3 is introduced into the first preheater 5.1, exchanges heat with pure water discharged from the pure water preparation device 8.2, preheats the pure water for the first time, the preheated pure water flows into the second preheater 5.2, exchanges heat with hydrogen generated by electrolysis of the solid oxide electrolytic cell 3.3 again, and preheats the pure water for the second time through the heat of the hydrogen; therefore, the heat of the hydrogen and the oxygen generated by the solid oxide electrolytic cell 3.3 can be recycled through the heat recycling unit 5, the pure water prepared by the pure water preparation unit 8 is preheated, the preheated pure water is provided for the steam generation unit 4, and the energy recycling of the whole system is realized; separating oxygen and water by a gas-water separator I5.3, introducing the separated oxygen into an oxygen storage tank 7 for storage, separating hydrogen and water by a gas-water separator II 5.4, and introducing the separated hydrogen into a hydrogen storage tank 6 for storage; the condensed water outlet of the first gas-water separator 5.3 and the condensed water outlet of the second gas-water separator 5.4 are both communicated with the water outlet of the pure water preparation device 8.2; the separated condensed water and the pure water prepared by the pure water preparation device 8.2 are converged into the first preheater 5.1, so that the recycling of the condensed water is realized.

The water outlet of the second preheater 5.2 is communicated with the water inlet of the resistance-type electric heating boiler 4.3, the steam outlet of the resistance-type electric heating boiler 4.3 is communicated with the steam inlet of the solid heat storage boiler 4.4 through a gas flow control valve 4.5, and the steam outlet of the solid heat storage boiler 4.4 is communicated with the steam inlet of the steam inlet main pipe 3.35; the pure water preheated for the second time is introduced into a resistance type electric heating boiler 4.3, the pure water is heated by the resistance type electric heating boiler 4.3 to generate saturated steam, then the saturated steam is heated to superheated steam by a solid heat storage boiler 4.4, the superheated steam generated by heating is introduced into a solid oxide electrolytic cell 3.3, the temperature of the superheated steam reaches 800 ℃, and clean heat energy is provided for the electrolytic reaction of the solid oxide electrolytic cell 3.3; compared with the existing high-temperature gas-cooled reactor, the utility model is more favorable for saving energy, fully utilizes the renewable energy and realizes the technical coupling of renewable energy power generation and high-temperature solid oxide electrolysis hydrogen production.

The resistance-type electric heating boiler 4.3 is prior art, the specific structure is not repeated herein, the resistance-type electric heating boiler 4.3 adopts a high-impedance tubular electric heating component, after the power is switched on, the tubular electric heating component is in the boiler barrel and is subjected to heat convection, so that the high heat generated by the electric heating component can heat or generate steam in the whole boiler barrel, the tubular electric heating component is composed of a metal shell, an electric heating wire and magnesium oxide, the metal shell is generally made of stainless steel or No. 10 seamless steel pipe, and the magnesium oxide is filled between the metal pipe wall and the electric heating wire as an insulator and a heat-conducting medium.

The solid heat storage boiler 4.4 comprises a base 4.41, a saturated steam inlet header 4.46, a superheated steam outlet header 4.47 and an insulated furnace shell 4.42 fixed at the top of the base 4.41; a heat storage brick layer 4.43 is built in the heat insulation furnace shell 4.42, and a plurality of electric heating wires 4.44 are embedded in the heat storage brick layer 4.43; a plurality of steam heating pipelines 4.45 penetrate through the heat storage brick layer 4.43, a saturated steam inlet header pipe 4.46 is communicated with inlets of the steam heating pipelines 4.45, and outlets of the steam heating pipelines 4.45 are communicated with a superheated steam outlet header pipe 4.47; a high-temperature fan 4.48 is arranged on the saturated steam inlet header 4.46, and a superheated steam outlet header 4.47 is connected with a steam inlet header 3.35; under the action of the high-temperature fan 4.48, saturated steam of the resistance-type electric heating boiler 4.3 is sent into a steam heating pipeline 4.45 laid in the solid heat storage boiler 4.4 through a pipeline, is heated by a heat storage brick layer 4.43 and then is sent into the solid oxide electrolytic cell 3.3 from a steam inlet header pipe 3.35 to provide a heat source.

On the basis of the original structure, the structure of the solid heat storage boiler 4.4 is improved, the heat supply of the original solid heat storage boiler is realized by medium heat exchange, namely, the gas-water or gas-gas heat exchanger is additionally arranged outside the solid heat storage boiler 4.4 to realize the external output of heat, and the steam heating pipeline 4.45 is directly and uniformly paved inside the solid heat storage boiler 4, namely, between heat accumulators of a heat storage brick layer 4.43, so that the heat exchange links are reduced, and the heat storage brick layer 4.43 is used for directly heating steam; the heating wire 4.44 in the solid heat storage boiler 4.4 is electrified to heat the heat storage brick layer 4.43, the heat storage brick layer 4.43 is usually magnesium metal oxide, the highest heat storage temperature can reach 900 ℃, the rated heat storage temperature adopted in the utility model is 850 ℃, the main functions of the solid heat storage boiler 4.4 are two, firstly, new energy electric energy of wind power and photovoltaic is converted into heat energy and stored, the solid heat storage boiler 4.4 has the heat storage function, so the solid heat storage boiler can be used as a peak regulation means of a power grid after being incorporated into the power grid, the new energy electric energy is stored in the low-valley period of the power grid load, the saturated steam is heated by using the heat energy stored in the solid heat storage boiler 4, and the electric heating power is regulated and reduced in the high-peak period of the power grid load, so that the technology has power grid friendliness; therefore, the function of smoothing wind and light output fluctuation is achieved, the resource utilization rate is improved, the problem of wind abandoning and electricity limiting in the three north areas in China is solved, redundant new energy electric power is stored through heat energy, and a peak clipping and valley filling means is provided for a power grid; secondly, saturated steam generated by heating the resistance-type electric boiler 4.3 is heated to superheated steam at 800 ℃ to provide superheated steam for the solid oxide electrolytic cell 3.3; the gas flow is adjusted by the gas flow control valve 4.5, and then the temperature of the high-temperature raw material steam is controlled.

The utility model can convert the electric energy of rich wind power and photovoltaic of the power grid into heat energy for storage by utilizing the resistance type electric heating boiler 4.3 and the solid heat storage boiler 4.4, and provides a novel energy source mode for electrolytic hydrogen production by the solid oxide electrolytic cell 3.3, which comprises the electric energy and the heat energy, realizes the coupling of new energy sources such as the wind power and the photovoltaic and a high-temperature solid oxide electrolytic hydrogen production technology, and simultaneously improves the resource utilization rate, relieves the problems of wind abandoning and electricity limiting in the three north areas of China, enables the redundant new energy source electric power to be stored through the hydrogen energy and the heat energy, and provides a peak clipping and valley filling means for the power grid.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (9)

1. The system is characterized by comprising a wind power generation unit, a photovoltaic power generation unit, a solid oxide electrolytic cell pile unit, a steam generation unit, a heat recovery and utilization unit, a hydrogen storage tank, an oxygen storage tank, a pure water preparation unit and a power distribution network;

the output end of the wind power generation unit and the output end of the photovoltaic power generation unit are respectively and electrically connected with the input end of the power distribution network, and the output end of the power distribution network is respectively and electrically connected with the power utilization equipment of the solid oxide electrolytic cell pile unit and the power utilization equipment of the steam generation unit;

an oxygen outlet of the solid oxide electrolytic cell stack unit is communicated with the oxygen storage tank through an oxygen outlet main pipe, and a hydrogen outlet of the solid oxide electrolytic cell stack unit is communicated with the hydrogen storage tank through a hydrogen outlet main pipe;

the steam generating unit comprises a solid heat storage boiler and a resistance type electric heating boiler; the water outlet of the pure water preparation unit is communicated with the water inlet of the resistance-type electric heating boiler, the steam outlet of the resistance-type electric heating boiler is communicated with the steam inlet of the solid heat storage boiler through a pipeline, and the steam outlet of the solid heat storage boiler is communicated with the steam inlet of the solid oxide electrolytic cell pile unit through a steam inlet main pipe.

2. The system of claim 1, wherein a gas flow control valve is arranged on a pipeline between a steam outlet of the resistance type electric heating boiler and a steam inlet of the solid heat storage boiler.

3. The system for combined operation of wind power generation, photovoltaic generation and solid oxide electrolytic hydrogen production according to claim 1, wherein the solid oxide electrolytic cell stack unit comprises a solid oxide electrolytic cell, an electrolytic hydrogen production transformer and a rectifier inverter;

the input end of the electrolysis hydrogen production transformer is electrically connected with the output end of the power distribution network, the output end of the electrolysis hydrogen production transformer is electrically connected with the input end of the rectifier inverter, and the output end of the rectifier inverter is electrically connected with the solid oxide electrolytic cell.

4. The system of claim 1, further comprising a stop valve and a check valve connected in series between the hydrogen outlet main and the steam inlet main.

5. The system for joint operation of wind power generation, photovoltaic and solid oxide electrolysis for hydrogen production according to claim 1, further comprising an electric heating system transformer and a boiler control cabinet;

the input end of the electric heating system transformer is electrically connected with the output end of the power distribution network, the output end of the electric heating system transformer is electrically connected with the input end of the boiler control cabinet, and the output end of the boiler control cabinet is electrically connected with the resistance type electric heating boiler and the solid heat storage boiler respectively.

6. The combined operation system for producing hydrogen by utilizing wind power, photovoltaic and solid oxide electrolysis according to any one of claims 1 to 5, wherein the heat recovery and utilization unit comprises a first preheater and a second preheater; an oxygen outlet of the oxygen outlet header pipe is communicated with an air inlet of the first preheater, and an air outlet of the first preheater is communicated with the oxygen storage tank through a pipeline; a hydrogen outlet of the hydrogen outlet header pipe is communicated with an air inlet of the second preheater, and an air outlet of the second preheater is communicated with the hydrogen storage tank through a pipeline; the water outlet of the pure water preparation unit is communicated with the water inlet of the first preheater, the water outlet of the first preheater is communicated with the water inlet of the second preheater, and the water outlet of the second preheater is communicated with the water inlet of the resistance type electric heating boiler.

7. The system for jointly operating wind power generation, photovoltaic generation and solid oxide electrolysis hydrogen production according to claim 6, further comprising a first gas-water separator and a second gas-water separator; the gas outlet of the first preheater is communicated with the gas inlet of the first gas-water separator, and the gas outlet of the first gas-water separator is communicated with the gas inlet of the oxygen storage tank; the gas outlet of the second preheater is communicated with the gas inlet of the gas-water second separator, and the gas outlet of the gas-water second separator is communicated with the gas inlet of the hydrogen storage tank; and the condensed water outlet of the first gas-water separator and the condensed water outlet of the second gas-water separator are communicated with the water outlet of the pure water preparation unit.

8. The system of claim 6, wherein the pure water preparation unit comprises a raw water storage tank and a pure water preparation device, and a water outlet of the raw water storage tank is communicated with a water inlet of the pure water preparation device.

9. The system for jointly operating wind power generation, photovoltaic generation and solid oxide electrolysis hydrogen production according to claim 1, wherein the solid heat storage boiler comprises a base, a saturated steam inlet header pipe, a superheated steam outlet header pipe and a heat insulation furnace shell fixed on the top of the base; a heat storage brick layer is built in the heat insulation furnace shell, and a plurality of electric heating wires are embedded in the heat storage brick layer; a plurality of water vapor heating pipelines are arranged in the heat storage brick layer in a penetrating manner, the saturated water vapor inlet header pipe is communicated with the inlet of each water vapor heating pipeline, and the outlet of each water vapor heating pipeline is communicated with the superheated water vapor outlet header pipe; and the saturated steam inlet main pipe is provided with a high-temperature fan.

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