A high-temperature solid oxide water electrolysis hydrogen production system coupled with photo-thermal power generation and thermo-chemical heat storage
By coupling solar thermal power generation with thermochemical thermal storage, the problems of unstable heat source and insufficient waste heat utilization in high-temperature solid oxide water electrolysis hydrogen production systems have been solved, achieving efficient and stable green hydrogen production, reducing hydrogen production costs, and improving the system's energy utilization rate and renewable energy compatibility.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HANGZHOU BOILER GRP CO LTD
- Filing Date
- 2025-08-08
- Publication Date
- 2026-08-04
AI Technical Summary
Existing high-temperature solid oxide electrolysis water production technology faces problems such as unstable heat sources and insufficient utilization of waste heat. The coupling of solar thermal power generation and SOEC lacks direct heat energy supply, and the poor integration design of thermochemical thermal storage systems with SOEC leads to low efficiency and energy waste.
Design a high-temperature solid oxide water electrolysis hydrogen production system that couples solar thermal power generation and thermochemical thermal storage. The solar thermal power generation provides clean electrical energy and high-temperature thermal energy, while the thermochemical thermal storage module realizes high-density storage and on-demand release of thermal energy, optimizes heat flow distribution, and improves system stability and efficiency.
It achieves efficient and stable thermal energy supply, reduces hydrogen production energy consumption, lowers unit cost, and improves renewable energy utilization. It is suitable for distributed or large-scale green hydrogen production and meets carbon neutrality goals.
Smart Images
Figure CN224591045U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the fields of thermal storage technology and water electrolysis for hydrogen production, and in particular to a high-temperature solid oxide water electrolysis hydrogen production system that couples solar thermal power generation and thermochemical thermal storage. Background Technology
[0002] With the global energy structure shifting towards low-carbon transformation, hydrogen energy has received widespread attention as a clean energy carrier. High-temperature solid oxide electrolysis (SOEC) hydrogen production technology has become a research hotspot due to its advantages such as high efficiency and low energy consumption. SOEC operates at high temperatures (700-1000℃), which can utilize thermal energy to replace part of the electrical energy and significantly reduce hydrogen production energy consumption. However, this technology faces the following problems: 1) Heat source and heat balance issues: SOEC operation requires a continuous and stable high-temperature heat source. Traditional electric heating methods are inefficient and difficult to match with the volatility of renewable energy sources. In addition, the endothermic reaction of electrolysis and system heat loss lead to increased heat demand, affecting overall efficiency; 2) Insufficient waste heat utilization: The high-temperature exhaust gas discharged by SOEC (such as unreacted water vapor and hot air) carries a large amount of waste heat. Existing systems have failed to achieve cascade utilization of thermal energy, resulting in energy waste.
[0003] Currently, concentrated solar power (CSP) technology can provide high-temperature heat energy through concentrated solar power collection, but its output is affected by fluctuations in solar radiation. Thermochemical thermal energy storage (TTE), on the other hand, can store heat energy with high energy density and release it on demand. Combining the two can improve the stability of heating supply. However, existing technologies face the following problems: 1) The coupling of CSP and SOEC focuses mainly on power supply, neglecting the direct satisfaction of the high-temperature heat demand of SOEC; 2) The integrated design of thermochemical thermal energy storage systems and SOEC is lacking, failing to effectively regulate heat flow distribution.
[0004] Therefore, there is an urgent need for a new integrated system that can solve the heat source problem of SOEC by synergistically supplying energy through solar thermal power generation and thermochemical thermal storage, and optimize the waste heat recovery path to achieve efficient, stable, green, and high-temperature hydrogen production. Utility Model Content
[0005] To solve the above-mentioned technical problems, this utility model designs a high-temperature solid oxide electrolysis water production system that couples solar thermal power generation and thermochemical thermal storage.
[0006] The present invention adopts the following technical solution: A high-temperature solid oxide electrolysis water production system coupled with solar thermal power generation and thermochemical thermal storage includes a power module, a thermochemical thermal storage and air supply module, a water vapor supply module and a high-temperature solid oxide electrolysis water module. The thermochemical heat storage and air supply module includes a thermochemical heat storage device, outside air is input into the thermochemical heat storage device, an electric heating wire is arranged inside the thermochemical heat storage device, the electric heating wire is connected to the power module, block heat storage material is arranged inside the thermochemical heat storage device, and the thermochemical heat storage and air supply module is connected to the water vapor supply module and the high temperature solid oxide electrolysis water module respectively. The high-temperature solid oxide electrolysis water module includes a high-temperature solid oxide electrolysis cell, which is connected to a power module, a thermochemical heat storage and air supply module, and a water vapor supply module. The water supply steam module includes a primary regenerator, a secondary regenerator, a tertiary regenerator, a quaternary regenerator, and an evaporator. The input cold water sequentially passes through the primary regenerator, the secondary regenerator, the tertiary regenerator, the evaporator, and the quaternary regenerator to connect to the high-temperature solid oxide electrolytic cell. The anode outlet of the high-temperature solid oxide electrolytic cell is connected to the heat exchange end of the secondary regenerator. The thermochemical heat storage and air supply module is connected to the heat exchange end of the tertiary regenerator. The cathode outlet of the high-temperature solid oxide electrolytic cell is connected to the heat exchange end of the primary regenerator after passing through the heat exchange end of the quaternary regenerator.
[0007] Preferably, the power module includes a photothermal mirror field, a heat absorption tower, a heat exchange and power generation system, and a power grid, wherein the photothermal mirror field is connected to the heat absorption tower, the heat absorption tower is connected to the heat exchange and power generation system, and the heat exchange and power generation system is connected to the power grid.
[0008] Preferably, the outside air is input into the thermochemical heat storage device via a fan.
[0009] Preferably, the heat exchange end of the fourth-stage regenerator is reconnected to the fourth-stage regenerator through node two and node one, where the evaporator output end is reconnected.
[0010] Preferably, a second fan is installed between node two and node one.
[0011] Preferably, the tank of the thermochemical heat storage device is arranged horizontally or vertically and is equipped with heat insulation, with electric heating wires arranged between the internal layers.
[0012] Preferably, the blocky thermal storage material has a honeycomb-shaped cylindrical structure with a diameter of 5-10 cm, a height of 5-10 cm, and a porosity of 45-55%.
[0013] Preferably, the block-shaped thermal storage material is evenly arranged at 1 / 4 to 3 / 4 of the height of the thermal storage tank, and the block-shaped thermal storage material is composed of M x O y The composition is composed of M, which is one or more of Mn, Co, Cu, and Ba.
[0014] Preferably, the high-temperature solid oxide electrolyzer is a hydrogen high-temperature solid oxide electrolyzer, which uses nanostructured electrodes and ABO3 type perovskite such as BaCeO3 and BaZrO3 as electrolyte, and is doped with one or more of Fe, Zr and Y, with a doping amount of 5-20%.
[0015] Preferably, the air source for the high-temperature solid oxide electrolytic cell is a thermochemical heat storage and air supply module with a flow rate of 4~5 m / s and an operating temperature of 600~750℃. The water vapor source is a multi-stage reheating water vapor supply module and water vapor after evaporation, with a flow rate of 8~10 m / s.
[0016] The beneficial effects of this utility model are: (1) efficient and stable thermal energy supply; the solar thermal power generation system provides clean electrical energy and high-temperature thermal energy, and the thermochemical thermal storage module realizes high-density storage and on-demand release of thermal energy through reversible reaction, which overcomes the problem of intermittent renewable energy and ensures the high-temperature stable operation of SOEC electrolyzer.
[0017] (2) Energy cascade utilization improves system efficiency; the coupled design of thermochemical thermal storage system and SOEC optimizes heat flow distribution, reduces the energy consumption of traditional electric heating, reduces the demand for external steam heating and hot air, and lowers the overall energy cost of hydrogen production. The introduction of thermochemical thermal storage module makes reasonable use of peak and valley electricity price difference, which significantly reduces the unit hydrogen production cost.
[0018] (3) System flexibility and adaptability to renewable energy, environmental friendliness; thermochemical thermal storage modules can smooth out the fluctuations of solar thermal power generation, enabling the system to still provide stable energy supply when there is insufficient sunshine, improve the utilization rate of renewable energy, and are suitable for distributed hydrogen production or large-scale centralized hydrogen energy production, realizing the clean production of green hydrogen and meeting the carbon neutrality target. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the present invention; In the diagram: 1. Photothermal mirror field; 2. Heat absorber tower; 3. Heat exchange and power generation system; 4. Power grid; 5. Fan 1; 6. Thermochemical thermal storage device; 7. High-temperature solid oxide electrolytic cell; 8. Water pump; 9. First-stage regenerator; 10. Second-stage regenerator; 11. Third-stage regenerator; 12. Evaporator; 13. Node 1; 14. Quaternary regenerator; 15. Node 2; 16. Fan 2. Detailed Implementation
[0020] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings: Example: Figure 1As shown, a high-temperature solid oxide electrolysis water production system that couples solar thermal power generation and thermochemical thermal storage includes four modules: a power module, a thermochemical thermal storage and air supply module, a steam supply module, and a high-temperature solid oxide electrolysis water module.
[0021] Power modules such as Figure 1 The area within the dashed box mainly includes a solar thermal mirror field 1, a heat absorption tower 2, a heat exchange and power generation system 3, and a power grid 4. The solar thermal mirror field is connected to the heat absorption tower, the heat absorption tower is connected to the heat exchange and power generation system, and the heat exchange and power generation system is connected to the power grid.
[0022] The thermochemical heat storage and air supply module includes a fan 5 and a thermochemical heat storage device 6. External air is input and connected to the fan, which in turn is connected to the thermochemical heat storage device. Electric heating wires are installed inside the thermochemical heat storage device and connected to the power module. Block-shaped heat storage material is also installed inside the thermochemical heat storage device. The thermochemical heat storage and air supply module is connected to both a steam supply module and a high-temperature solid oxide electrolysis water module.
[0023] The high-temperature solid oxide electrolysis water module includes a high-temperature solid oxide electrolysis cell 7. This module is connected to the power module, the thermochemical heat storage and air supply module, and the water steam supply module.
[0024] The water supply steam module includes a water pump 8, a primary regenerator 9, a secondary regenerator 10, a tertiary regenerator 11, an evaporator 12, node one 13, a quaternary regenerator 14, node two 15, and fan two 16. External cold water is input and connected to the water pump. The water pump is connected to the primary regenerator. The primary regenerator is connected to the secondary regenerator and node two. The secondary regenerator is connected to the high-temperature solid oxide electrolysis water module and the tertiary regenerator. The tertiary regenerator is connected to the thermochemical heat storage and air supply module and the evaporator. The evaporator is connected to node one. Node one is connected to the quaternary regenerator and fan two. The secondary regenerator is connected to the high-temperature solid oxide electrolysis water module and node two. Node two is connected to fan two.
[0025] The thermochemical thermal storage tank is arranged horizontally or vertically, and the tank is insulated. Electric heating wires are arranged between the internal layers. The blocky thermal storage material has a honeycomb-like cylindrical structure, with a diameter of 5-10 cm, a height of 5-10 cm, and a porosity of 45-55%. The blocky thermal storage material is evenly distributed at 1 / 4 to 3 / 4 of the tank height. The blocky thermal storage material is composed of MxOy, where M is one or more of Mn, Co, Cu, and Ba.
[0026] The high-temperature solid oxide electrolysis uses a hydrogen-based high-temperature solid oxide electrolyzer with nanostructured electrodes. The electrolyte is an ABO3-type perovskite such as BaCeO3 and BaZrO3, doped with one or more of Fe, Zr, and Y, with a doping amount of 5-20%. The air source for the high-temperature solid oxide electrolyzer is a thermochemical heat storage and air supply module, with a flow rate of 4-5 m / s and an operating temperature of 600-750℃. The water vapor source is multi-stage reheating and evaporated water vapor, with a flow rate of 8-10 m / s.
[0027] Working method: The power module is a tower-type solar thermal power generation. After the heat is collected by the heat absorption tower, one side heats the molten salt, which exchanges heat with water to generate steam for power generation and sends it to the grid; the other side heats the block-shaped heat storage material to store heat in metal oxides.
[0028] During off-peak electricity hours, the inlet and outlet valves of the thermochemical thermal storage device are closed. Resistance heating / molten salt heat exchange is used to gradually heat the bulk thermal storage material. The metal oxides are reduced and undergo an endothermic reaction, while oxygen is discharged through the pressure balancing device within the storage device. Heating is complete when the temperature sensor indicates a temperature of 980~1020℃. Electric heating is then stopped, and the device is maintained at a slightly positive pressure. A fan draws in ambient air; during off-peak electricity hours, the air is directly heated electrically, bypassing the thermochemical thermal storage device. When the air is heated to 600~750℃, it is fed into a high-temperature solid oxide electrolysis cell.
[0029] During the peak power phase, the inlet and outlet valves of the thermochemical thermal storage device are opened, and the air is heated using the thermal storage module. The metal oxides are oxidized and undergo an exothermic reaction. A fan draws ambient air into the thermochemical thermal storage device, and when the air is heated to 600~750℃, it is sent into the high-temperature solid oxide electrolytic cell.
[0030] After being pressurized by a water pump, water is preheated through a primary, secondary, and tertiary regenerator before being fed into an evaporator to generate steam at the temperature required for the high-temperature solid oxide electrolysis cell. The heat source for the tertiary regenerator is either electric heating (during off-peak electricity hours) or a thermochemical thermal storage device (during peak electricity hours). AC power from the power module is converted to DC power by a rectifier and used for electrolysis at high temperatures (600~750℃), converting the high-temperature steam into hydrogen and oxygen.
[0031] The cathode outlet contains generated hydrogen and unreacted water vapor. The inlet water vapor is preheated and then splits into two parts. One part flows through a primary regenerator to preheat the water pressurized by the pump, while the other part is drawn back into the water vapor pipeline by a second blower to continue the electrolysis reaction. The anode outlet contains generated oxygen and carrier air, which flows through a secondary regenerator to further preheat the water. The generated hydrogen and oxygen are separated, purified, and stored in specific tanks.
[0032] This invention optimizes the thermal-electric synergistic management of hydrogen production systems through the efficient coupling of solar thermal power generation, thermochemical thermal storage, and SOEC, thereby improving energy utilization while reducing operating costs and providing a reliable technical solution for large-scale renewable energy high-temperature hydrogen production.
[0033] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.
Claims
1. A high-temperature solid oxide water electrolysis hydrogen production system coupled with photo-thermal power generation and thermo-chemical heat storage, characterized in that, It includes a power module, a thermochemical thermal storage and air supply module, a water and steam supply module, and a high-temperature solid oxide electrolysis water module; The thermochemical heat storage and air supply module includes a thermochemical heat storage device, outside air is input into the thermochemical heat storage device, an electric heating wire is arranged inside the thermochemical heat storage device, the electric heating wire is connected to the power module, block heat storage material is arranged inside the thermochemical heat storage device, and the thermochemical heat storage and air supply module is connected to the water vapor supply module and the high temperature solid oxide electrolysis water module respectively. The high-temperature solid oxide electrolysis water module includes a high-temperature solid oxide electrolysis cell, which is connected to a power module, a thermochemical heat storage and air supply module, and a water vapor supply module. The water supply steam module includes a primary regenerator, a secondary regenerator, a tertiary regenerator, a quaternary regenerator, and an evaporator. The input cold water sequentially passes through the primary, secondary, tertiary, and evaporators and is connected to the high-temperature solid oxide electrolytic cell. The anode outlet of the high-temperature solid oxide electrolytic cell is connected to the heat exchange end of the secondary regenerator. The thermochemical heat storage and air supply module is connected to the heat exchange end of the tertiary regenerator. The cathode outlet of the high-temperature solid oxide electrolytic cell is connected to the heat exchange end of the primary regenerator after passing through the heat exchange end of the quaternary regenerator.
2. The high-temperature solid oxide water electrolysis hydrogen production system coupled with solar thermal power generation and thermochemical thermal storage according to claim 1, characterized in that, The power module includes a photothermal mirror field, a heat absorption tower, a heat exchange and power generation system, and a power grid. The photothermal mirror field is connected to the heat absorption tower, the heat absorption tower is connected to the heat exchange and power generation system, and the heat exchange and power generation system is connected to the power grid.
3. The system of claim 1, wherein the system further comprises a high-temperature solid oxide water electrolysis system coupled to the solar thermal power system and the thermo-chemical heat storage system. The outside air is input into the thermochemical heat storage device through a fan.
4. The system of claim 1, wherein the system further comprises a high-temperature solid oxide water electrolysis system coupled to the solar thermal power system and the thermal chemical storage system. The heat exchange end of the fourth-stage regenerator is reconnected to the fourth-stage regenerator through the evaporator output end, which is connected via node 2 and node 1.
5. The system of claim 4, wherein the system further comprises a high-temperature solid oxide water electrolysis system coupled to the solar thermal power system and the thermo-chemical heat storage system. A second fan is installed between node two and node one.
6. The system of claim 1, wherein the system further comprises a high-temperature solid oxide water electrolysis system coupled to the solar thermal power system and the thermal chemical heat storage system. The tank of the thermochemical heat storage device is arranged horizontally or vertically and is equipped with heat insulation, with electric heating wires arranged between the internal layers.
7. The system of claim 1, wherein the system further comprises a high-temperature solid-oxide water electrolysis system coupled to the solar thermal power system and the thermo-chemical heat storage system. The blocky thermal storage material has a honeycomb-shaped cylindrical structure with a diameter of 5-10 cm, a height of 5-10 cm, and a porosity of 45-55%. 8.The high-temperature solid oxide water electrolysis system coupled with photo-thermal power generation and thermo-chemical heat storage according to claim 1, characterized in that, The block-shaped thermal storage material is evenly distributed at 1 / 4 to 3 / 4 of the height of the thermal storage tank. 9.The high-temperature solid oxide water electrolysis system coupled with photo-thermal power generation and thermo-chemical heat storage of claim 1, wherein, The high-temperature solid oxide electrolyzer is a hydrogen high-temperature solid oxide electrolyzer, employing nanostructured electrodes.
10. The system of claim 1, wherein the system is characterized in that, The air source for the high-temperature solid oxide electrolytic cell is a thermochemical heat storage and air supply module with a flow rate of 4~5 m / s and an operating temperature of 600~750℃. The water vapor source is a multi-stage reheating water vapor supply module and water vapor after evaporation, with a flow rate of 8~10 m / s.