Multi-energy co-production system based on geothermal energy and LNG cold energy
By combining geothermal dual ORC power generation modules and LNG cold energy integrated utilization modules, the problem of insufficient energy utilization when combining geothermal energy and LNG cold energy is solved, realizing efficient energy utilization and multiple energy outputs, reducing operating costs and improving profitability.
Patent Information
- Application Number
- CN202511580765.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-31
- Publication Date
- 2025-12-12
AI Technical Summary
In existing technologies, when geothermal energy is combined with LNG cold energy, energy utilization is insufficient, resulting in high operating costs, low profitability, and difficulty in large-scale development.
The system employs a geothermal dual ORC power generation module and an LNG cold energy comprehensive utilization module. By combining the first and second power generation cycles, it utilizes geothermal fluids and LNG cold energy to generate electricity multiple times. It also uses an LNG heating device to reheat the natural gas. Combined with RO seawater desalination and SOFC-PEM electrolysis hydrogen production modules, it achieves full utilization of energy.
It improves energy utilization, reduces operating costs, enhances profitability, and enables efficient utilization of multiple energy outputs.
Smart Images
Figure CN121111418A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of energy systems, and particularly relates to a multi-energy cogeneration system based on geothermal energy and LNG cold energy. BACKGROUND
[0002] In the global energy transformation process, integrating renewable energy into traditional energy systems has become a key trend, and multi-carrier energy systems have emerged. This system integrates various energy carriers and conversion technologies, and from the economic and environmental aspects, it realizes the connection of different energy vectors and guarantees reliable energy supply for end users.
[0003] Geothermal energy, as a stable renewable energy source, is less affected by weather conditions and has a small land footprint, making it particularly advantageous in areas where land resources are scarce. Currently, geothermal energy is mainly utilized through organic Rankine cycle (ORC), supercritical carbon dioxide cycle, and Kalina cycle technologies. Related research focuses on system integration and optimization to improve performance and achieve economic and environmental benefits. Liquid natural gas (LNG) releases a large amount of cold energy during the gasification process, and if effectively recovered and utilized, it can significantly improve energy utilization efficiency. In theory, combining geothermal energy with LNG cold energy can achieve multiple energy outputs, but in actual energy supply processes, this model often faces the problem of insufficient energy utilization, resulting in high operating costs and low revenue efficiency, which is not conducive to the large-scale development and promotion of the technology. In order to improve energy utilization and reduce operating costs, a multi-energy cogeneration system based on geothermal energy and LNG cold energy is proposed. SUMMARY
[0004] The present application aims to at least solve one of the problems in the prior art.
[0005] To this end, the present application proposes a multi-energy cogeneration system based on geothermal energy and LNG cold energy, which has the advantage of improving energy utilization.
[0006] The multi-energy cogeneration system based on geothermal energy and LNG cold energy according to the embodiments of the present application comprises a geothermal double-ORC power generation module and an LNG cold energy comprehensive utilization module. The geothermal double-ORC power generation module comprises a first power generation cycle and a second power generation cycle. The working fluid of the first power generation cycle absorbs the heat of the geothermal fluid to generate power. The working fluid of the second power generation cycle absorbs the heat of the working fluid of the first power generation cycle to generate power. The LNG cold energy comprehensive utilization module utilizes the heat energy of the working fluid of the second power generation cycle to generate power, and utilizes the heat of the geothermal fluid after being used by the first power generation cycle to reheat natural gas for subsequent use.
[0007] According to one embodiment of the present invention, the first power generation cycle includes a first evaporator, a first turbine, a second evaporator, and a first pump body; the working fluid of the first power generation cycle exchanges heat with geothermal fluid in the first evaporator to heat the working fluid into superheated steam, the steam expands in the first turbine to do work and convert it into electrical energy, and the fluid after doing work is cooled in the second evaporator and returned to the first evaporator via the first pump body, completing the cycle; the second power generation cycle includes a second turbine, a condenser, and a second pump body; the working fluid of the second power generation cycle exchanges heat with the working fluid of the first power generation cycle in the second evaporator to heat the working fluid into superheated steam, the steam expands in the second turbine to do work and convert it into electrical energy, and the fluid after doing work is cooled in the condenser and returned to the second evaporator via the second pump body, completing the cycle.
[0008] According to one embodiment of the present invention, the LNG cold energy integrated utilization module includes: an LNG storage tank, an LNG pump body, an LNG heating device, and a third turbine; the natural gas is guided from the LNG storage tank to the condenser through the LNG pump body to reduce the heat of the working fluid in the second power generation cycle. By reducing the heat of the working fluid in the second power generation cycle, the temperature gradient of the geothermal dual ORC power generation module is widened, thereby improving the power generation efficiency. Then, the natural gas is reheated by the LNG heating device to raise the temperature of the natural gas to an acceptable range. The heated natural gas then enters the third turbine to generate electricity.
[0009] According to one embodiment of the present invention, the LNG heating device is an industrial cooling device, which heats the natural gas while reducing the temperature of the working fluid of the LNG heating device, thereby generating a cooling load for continued use by surrounding factories and cold chain centers.
[0010] According to one embodiment of the present invention, the system further includes an RO seawater desalination module. The electrical energy generated by the first power generation cycle is used to supply the RO seawater desalination module for seawater desalination. The RO seawater desalination module includes a low-pressure pump, a filter, a chemical reactor, a high-pressure pump, a reverse osmosis unit, a freshwater tank, and a Pelton turbine. Under the action of the low-pressure pump, seawater is pre-filtered by the filter and chemical reactor to remove large particulate impurities, sediments, and chlorine. Then, under the action of the high-pressure pump, the pre-filtered seawater enters the reverse osmosis unit, where water molecules permeate through the membrane to become freshwater, which is then collected and utilized in the freshwater tank. Meanwhile, the concentrated brine containing high concentrations of impurities is recovered by the Pelton turbine.
[0011] According to one embodiment of the present invention, it further includes an SOFC-PEM electrolysis hydrogen production module, which includes a solid oxide fuel cell stack and a PEM electrolyzer. The natural gas used by the third turbine enters the solid oxide fuel cell stack as fuel for the solid oxide fuel cell stack. Oxygen for the electrochemical reaction is extracted from the surrounding air and converted into electrical energy at high temperature. The generated electrical energy, together with the electrical energy generated by the second turbine and the third turbine, is transported to the PEM electrolyzer.
[0012] According to one embodiment of the present invention, the SOFC-PEM electrolysis hydrogen production module further includes a first fuel preheater, a second fuel preheater, a water pump, a water preheater, and a mixer; the first fuel preheater and the second fuel preheater are used to reheat the natural gas after it has been used by the third turbine, and then the gas enters the mixer; the water pump directs the first water source to the water preheater, where it is heated, and then it enters the mixer to mix with the natural gas. After mixing, the mixture enters the solid oxide fuel cell stack. The natural gas reforming reaction requires steam as a reactant, and the hot water is mixed to provide a steam source.
[0013] According to one embodiment of the present invention, the SOFC-PEM electrolysis hydrogen production module further includes an air compressor, an air preheater, and an afterburner. The air compressor introduces air into the air preheater to increase the air temperature, and then the air enters the solid oxide fuel cell stack. After the solid oxide fuel cell stack utilizes the excess air and unused fuel, the air enters the afterburner for combustion to generate high-temperature gas, which then enters the second fuel preheater, water preheater, and air preheater in sequence to provide heat for them.
[0014] According to one embodiment of the present invention, the SOFC-PEM electrolysis hydrogen production module further includes a heat exchanger, a hydrogen tank, a separator, and an oxygen tank. A second water source enters the heat exchanger for preheating. The preheated second water source mixes with the second water source at the outlet of the PEM electrolyzer. The mixture is then directed to the cathode side, where the water undergoes an electrochemical reaction under the action of external electrical energy, decomposing into hydrogen and oxygen. The hydrogen directly enters the hydrogen tank for storage. The separator separates the water and oxygen mixture; the oxygen enters the oxygen tank, and the water returns to the outlet to mix with the preheated second water source. The injected new water is approximately °C, the circulating water is °C, and the mixed water is approximately - °C. After mixing, the water temperature can be controlled at the optimal operating temperature. The circulating water discharged from the separator contains residual ions. / Its concentration needs to be maintained at .-mol / L. If pure new water is injected directly, the ion concentration will be diluted, and the electrolysis efficiency will decrease by %. Mixing circulating water can maintain ion balance and avoid frequent addition of chemicals.
[0015] The beneficial effects of this invention are that it utilizes the heat of geothermal fluid in a first power generation cycle to generate electricity, and then utilizes the residual heat of the working fluid in the first power generation cycle in a second power generation cycle to generate electricity again, thus achieving full utilization of energy. Furthermore, the second power generation cycle cools the working fluid in the first power generation cycle, reducing the temperature difference between the working fluid and the geothermal fluid, allowing the working fluid in the first power generation cycle to more fully absorb the temperature of the geothermal fluid. Additionally, an LNG cold energy integrated utilization module absorbs the heat of the working fluid in the second power generation cycle for power generation, and the heat from the geothermal fluid used in the first power generation cycle is used to reheat the natural gas, further fully utilizing the thermal energy of the geothermal fluid and the working fluid in the second power generation cycle. This full utilization of energy improves profitability.
[0016] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention.
[0017] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the overall process of the present invention; Figure label: 1. First evaporator; 2. First turbine; 3. Second evaporator; 4. First pump body; 5. Second pump body; 6. Geothermal production well; 7. Condenser; 8. Second turbine; 9. LNG heating device; 10. LNG pump body; 11. LNG storage tank; 12. Filter; 13. Low-pressure pump; 14. Chemical reactor; 15. High-pressure pump; 16. Reverse osmosis unit; 17. Pelton turbine; 18. Freshwater tank; 19. Third turbine; 20. Pressure reducing valve; 21. First fuel preheater; 22. Reinjection well; 23. Air compressor; 24. Water pump; 25. Second fuel preheater; 26. Mixer; 27. Water preheater; 28. Air preheater; 29. Solid oxide fuel cell stack; 30. Afterburner; 31. Heat exchanger; 32. Separator; 33. Hydrogen tank; 34. Oxygen tank; 35. PEM electrolyzer. Detailed Implementation
[0019] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.
[0020] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0021] The following describes in detail, with reference to the accompanying drawings, a multi-energy combined production system based on geothermal energy and LNG cold energy according to an embodiment of the present invention.
[0022] like Figure 1 As shown, the multi-energy cogeneration system based on geothermal energy and LNG cold energy according to an embodiment of the present invention includes: a geothermal dual ORC power generation module and an LNG cold energy comprehensive utilization module; the geothermal dual ORC power generation module includes: a first power generation cycle and a second power generation cycle, wherein the working fluid of the first power generation cycle absorbs heat from the geothermal fluid from the geothermal production well 6 to generate electricity, and the working fluid of the second power generation cycle absorbs heat from the working fluid of the first power generation cycle to generate electricity; the LNG cold energy comprehensive utilization module uses the heat energy of the working fluid of the second power generation cycle to generate electricity, and uses the heat of the geothermal fluid after use in the first power generation cycle to reheat the natural gas for subsequent use.
[0023] In this embodiment, a first power generation cycle utilizes the heat of geothermal fluid to generate electricity, and a second power generation cycle utilizes the residual heat of the working fluid from the first power generation cycle to generate electricity again, achieving full utilization of energy. Furthermore, the second power generation cycle cools the working fluid of the first power generation cycle, reducing the temperature difference between the working fluid and the geothermal fluid, allowing the working fluid of the first power generation cycle to more fully absorb the temperature of the geothermal fluid. Additionally, an LNG cold energy comprehensive utilization module absorbs the heat of the working fluid in the second power generation cycle to generate electricity, and the heat from the geothermal fluid after use in the first power generation cycle is used to reheat the natural gas, further fully utilizing the thermal energy of the geothermal fluid and the working fluid of the second power generation cycle. This full utilization of energy improves profitability.
[0024] The first power generation cycle includes a first evaporator 1, a first turbine 2, a second evaporator 3, and a first pump body 4. The working fluid in the first power generation cycle exchanges heat with geothermal fluid in the first evaporator 1, heating the working fluid into superheated steam. The steam expands in the first turbine 2, performing work to convert it into electrical energy. After performing work, the fluid is cooled in the second evaporator 3 and returns to the first evaporator 1 via the first pump body 4, completing the cycle. The second power generation cycle includes a second turbine 8, a condenser 7, and a second pump body 5. The working fluid in the second power generation cycle exchanges heat with the working fluid in the first power generation cycle in the second evaporator 3, heating the working fluid into superheated steam. The steam expands in the second turbine 8, performing work to convert it into electrical energy. After performing work, the fluid is cooled in the condenser 7 and returns to the second evaporator 3 via the second pump body 5, completing the cycle.
[0025] The LNG cold energy integrated utilization module includes: LNG storage tank 11, LNG pump body 10, LNG heating device 9, and third turbine 19; natural gas is guided from LNG storage tank 11 to condenser 7 through LNG pump body 10 to reduce the heat of the working fluid in the second power generation cycle. By reducing the heat of the working fluid in the second power generation cycle, the temperature gradient of the geothermal dual ORC power generation module is widened, and the power generation efficiency is improved. Then, it is reheated by LNG heating device 9 to raise the temperature of natural gas to an acceptable range. The heated natural gas enters the third turbine 19 to generate electricity.
[0026] The LNG heating unit 9 is an industrial cooling device that heats the natural gas while lowering the temperature of the working fluid in the LNG heating unit 9, generating a cooling load for continued use by surrounding factories and cold chain centers.
[0027] It also includes an RO seawater desalination module. The electricity generated by the first power generation cycle is used to supply the RO seawater desalination module for seawater desalination. The RO seawater desalination module includes a low-pressure pump 13, a filter 12, a chemical reactor 14, a high-pressure pump 15, a reverse osmosis unit 16, a freshwater tank 18, and a Pelton turbine 17. Under the action of the low-pressure pump 13, seawater is pre-filtered by the filter 12 and the chemical reactor 14 to remove large particulate impurities, sediments, and chlorine. Then, under the action of the high-pressure pump 15, the pre-filtered seawater enters the reverse osmosis unit 16. Water molecules permeate through the membrane to become freshwater, which enters the freshwater tank 18 for collection and utilization. Meanwhile, the concentrated brine containing high concentrations of impurities is recovered by the Pelton turbine 17.
[0028] It also includes an SOFC-PEM electrolysis hydrogen production module, which includes a solid oxide fuel cell stack 29 and a PEM electrolyzer 35. The natural gas used by the third turbine 19 enters the solid oxide fuel cell stack 29 as fuel for the solid oxide fuel cell stack 29. Oxygen for the electrochemical reaction is extracted from the surrounding air and converted into electrical energy at high temperature. The generated electrical energy, together with the electrical energy generated by the second turbine 8 and the third turbine 19, is delivered to the PEM electrolyzer 35.
[0029] The SOFC-PEM electrolysis hydrogen production module also includes a first fuel preheater 21, a second fuel preheater 25, a water pump 24, a water preheater 27, and a mixer 26. The first fuel preheater 21 and the second fuel preheater 25 are used to reheat the natural gas used by the third turbine 19 before it enters the mixer 26. The water pump 24 directs the first water source to the water preheater 27, where it is heated before entering the mixer 26 to mix with the natural gas. After mixing, the mixture enters the solid oxide fuel cell stack 29. The natural gas reforming reaction requires steam as a reactant, and the hot water is mixed to provide a steam source. Before entering the first fuel preheater 21, the natural gas used by the third turbine 19 is depressurized by a pressure reducing valve 20. The geothermal fluid flows to the first fuel preheater 21 after passing through the first evaporator 1, where it heats the natural gas before flowing into the reinjection well 22.
[0030] The SOFC-PEM electrolysis hydrogen production module also includes an air compressor 23, an air preheater 28, and an afterburner 30. The air compressor 23 introduces air into the air preheater 28 to increase the air temperature, and then into the solid oxide fuel cell stack 29. After the solid oxide fuel cell stack 29 utilizes the excess air and unused fuel, it enters the afterburner 30 for combustion to produce high-temperature gas, which then sequentially enters the second fuel preheater 25, the water preheater 27, and the air preheater 28 to provide heat.
[0031] The SOFC-PEM electrolysis hydrogen production module also includes a heat exchanger 31, a hydrogen tank 33, a separator 32, and an oxygen tank 34. A second water source enters the heat exchanger 31 for preheating. The preheated second water source mixes with the second water source at the outlet of the PEM electrolysis cell 35. The mixture is then directed to the cathode side, where the water undergoes an electrochemical reaction under the influence of external electrical energy, decomposing into hydrogen and oxygen. The hydrogen directly enters the hydrogen tank 33 for storage. The separator 32 separates the water and oxygen mixture; the oxygen enters the oxygen tank 34, and the water returns to the outlet to mix with the preheated second water source. The injected fresh water is approximately 80°C, the circulating water is 50°C, and the mixed water is approximately 60-70°C. After mixing, the water temperature can be controlled at the optimal operating temperature. The circulating water discharged from the separator 32 contains residual ions. / Its concentration needs to be maintained at 0.5-1 mol / L. If pure new water is injected directly, the ion concentration will be diluted, and the electrolysis efficiency will decrease by 10-15%. Mixed circulating water can maintain ion balance and avoid frequent addition of chemicals.
[0032] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0033] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims
1. A multi-energy cogeneration system based on geothermal energy and LNG cold energy, characterized in that, include: A geothermal dual ORC power generation module, comprising: a first power generation cycle and a second power generation cycle, wherein the working fluid of the first power generation cycle absorbs heat from the geothermal fluid to generate electricity, and the working fluid of the second power generation cycle absorbs heat from the working fluid of the first power generation cycle to generate electricity. The LNG cold energy comprehensive utilization module utilizes the thermal energy of the working fluid in the second power generation cycle to generate electricity, and utilizes the heat of the geothermal fluid after the first power generation cycle to reheat the natural gas for subsequent use.
2. The multi-energy cogeneration system based on geothermal energy and LNG cold energy according to claim 1, characterized in that, The first power generation cycle includes a first evaporator (1), a first turbine (2), a second evaporator (3), and a first pump body (4); the working fluid of the first power generation cycle exchanges heat with the geothermal fluid in the first evaporator (1) to heat the working fluid into superheated steam, the steam expands in the first turbine (2) to do work and convert it into electrical energy, and the fluid after doing work is cooled in the second evaporator (3) and then returned to the first evaporator (1) through the first pump body (4) to complete the cycle; The second power generation cycle includes a second turbine (8), a condenser (7), and a second pump (5). The working fluid of the second power generation cycle exchanges heat with the working fluid of the first power generation cycle in the second evaporator (3) to heat the working fluid into superheated steam. The steam expands in the second turbine (8) to do work and convert it into electrical energy. After doing work, the fluid is cooled in the condenser (7) and then returns to the second evaporator (3) via the second pump (5) to complete the cycle.
3. The multi-energy cogeneration system based on geothermal energy and LNG cold energy according to claim 2, characterized in that, The LNG cold energy integrated utilization module includes: LNG storage tank (11), LNG pump body (10), LNG heating device (9) and third turbine (19); the natural gas is guided from LNG storage tank (11) to condenser (7) through LNG pump body (10) to reduce the heat of the working fluid of the second power generation cycle, and then reheated through LNG heating device (9). The heated natural gas enters the third turbine (19) to generate electricity.
4. The multi-energy cogeneration system based on geothermal energy and LNG cold energy according to claim 3, characterized in that, The LNG heating device (9) is an industrial cooling device.
5. The multi-energy cogeneration system based on geothermal energy and LNG cold energy according to claim 1, characterized in that, It also includes an RO seawater desalination module, whereby the electrical energy generated by the first power generation cycle is used to supply the RO seawater desalination module for seawater desalination.
6. The multi-energy cogeneration system based on geothermal energy and LNG cold energy according to claim 4, characterized in that, It also includes an SOFC-PEM electrolysis hydrogen production module, which includes a solid oxide fuel cell stack (29) and a PEM electrolyzer (35). The natural gas used by the third turbine (19) enters the solid oxide fuel cell stack (29) as fuel for the solid oxide fuel cell stack (29). The oxygen used for the electrochemical reaction is extracted from the surrounding air and converted into electrical energy at high temperature. The generated electrical energy, together with the electrical energy generated by the second turbine (8) and the third turbine (19), is transported to the PEM electrolyzer (35).
7. The multi-energy cogeneration system based on geothermal energy and LNG cold energy according to claim 6, characterized in that, The SOFC-PEM electrolysis hydrogen production module also includes a first fuel preheater (21), a second fuel preheater (25), a water pump (24), a water preheater (27), and a mixer (26); the first fuel preheater (21) and the second fuel preheater (25) are used to reheat the natural gas after it has been used by the third turbine (19), and then it enters the mixer (26); the water pump (24) directs the first water source to the water preheater (27), heats it in the water preheater (27), and then enters the mixer (26) to mix with the natural gas, and after mixing, it enters the solid oxide fuel cell stack (29).
8. The multi-energy cogeneration system based on geothermal energy and LNG cold energy according to claim 7, characterized in that, The SOFC-PEM electrolysis hydrogen production module also includes an air compressor (23), an air preheater (28), and an afterburner (30). The air compressor (23) introduces air into the air preheater (28) to increase the air temperature, and then into the solid oxide fuel cell stack (29). After the solid oxide fuel cell stack (29) utilizes the excess air and unused fuel, it enters the afterburner (30) for combustion to generate high-temperature gas, which then enters the second fuel preheater (25), water preheater (27), and air preheater (28) in sequence to provide heat for them.
9. The multi-energy cogeneration system based on geothermal energy and LNG cold energy according to claim 8, characterized in that, The SOFC-PEM electrolysis hydrogen production module also includes a heat exchanger (31), a hydrogen tank (33), a separator (32), and an oxygen tank (34). The second water source enters the heat exchanger (31) for preheating. The preheated second water source mixes with the second water source at the outlet of the PEM electrolysis cell (35). The mixture is then directed to the cathode side. Under the action of external electrical energy, the water undergoes an electrochemical reaction and decomposes into hydrogen and oxygen. The hydrogen directly enters the hydrogen tank (33) for storage. The separator (32) separates the water and oxygen mixture. The oxygen enters the oxygen tank (34), and the water returns to the outlet to mix with the preheated second water source.