Solid oxide electrolytic hydrogen production system

Abstract

The invention provides a solid oxide electrolytic hydrogen production system, which relates to the field of renewable energy and new energy fluctuation power supply regulation and energy storage, and comprises an SOEC module, an air transmission pipeline, a steam transmission pipeline, a steam supply module, an oxygen transmission pipeline, a hydrogen transmission pipeline and a solid hydrogen storage device. One end of the air transmission pipeline is communicated to the SOEC air inlet; one end of the steam transmission pipeline is communicated to the SOEC steam inlet, and the other end of the steam transmission pipeline is communicated to the steam supply module; one end of the oxygen transmission pipeline is communicated to the SOEC oxygen outlet; one end of the hydrogen transmission pipeline is communicated to the SOEC hydrogen discharge port, and the other end of the hydrogen transmission pipeline is communicated to the solid hydrogen storage device. The solid oxide electrolytic hydrogen production system can convert electric energy into hydrogen and store the hydrogen in a solid hydrogen storage mode, the energy conversion efficiency is high, the application range is wide, energy storage energy loss is avoided during long-time energy storage, high-temperature steam generated in the power generation process of power supply equipment can be further utilized, and the energy utilization rate is high. The energy utilization rate is high.

Description

Technical Field

[0001] The present invention relates to the fields of renewable energy, new energy fluctuation power supply regulation and energy storage, and in particular to a solid oxide electrolysis hydrogen production system. Background Art

[0002] In recent years, with the continuous development of renewable energy, power supply equipment that uses solar energy, wind energy, geothermal energy, etc. to generate electricity has been further developed and applied. When these power generation equipment using renewable energy supplies electricity to the outside, there are usually limitations such as strong power supply volatility, strong dependence on power supply sources, weak load response adaptability, and high difficulty in grid dispatching. In order to provide a stable power supply to the outside, the electric energy generated by the fluctuating power supply can be stored.

[0003] Traditional means of electric energy storage mainly include pumped storage, compressed air storage, flywheel storage, and the new battery storage that is being promoted. However, traditional energy storage methods have low energy conversion efficiency and are limited in application occasions. For example, the pumped storage currently used on a large scale is mainly suitable for places with land height differences and abundant water resources; the investment cost of compressed air storage equipment is high and it is not suitable for large-scale promotion; flywheel storage is mainly suitable for occasions with short energy storage cycles, especially for energy storage scenarios where renewable energy power supply is dispatched on a daily, weekly, or seasonal basis; although battery storage has a high energy conversion efficiency, the battery decays quickly, recycling is difficult, and the investment cost is high, which has always been a difficulty in the industry. In addition, the steam generated by some power supply equipment is also directly discharged to the outside, resulting in the heat energy not being further utilized and the energy utilization rate being low.

[0004] Based on this, in order to effectively store the electrical energy generated by renewable energy, recover the heat in the steam, and improve the energy utilization rate, it is necessary to provide a new system. Summary of the invention

[0005] The present invention provides a solid oxide electrolysis hydrogen production system to solve the defects of traditional electric energy storage means in the prior art, such as low energy conversion efficiency, large application limitations, energy loss during long-term energy storage, and low energy utilization rate due to the high-temperature steam generated by power supply equipment during power generation not being further utilized.

[0006] The present invention provides a solid oxide electrolysis hydrogen production system, comprising: A SOEC module, wherein the SOEC module has a SOEC air inlet, a SOEC steam inlet, a SOEC oxygen exhaust port, and a SOEC hydrogen exhaust port; An air transmission pipeline, one end of which is connected to the air inlet of the SOEC, and the other end of which is connected to the air inlet of the outside atmosphere; A steam transmission pipeline and a steam supply module, wherein one end of the steam transmission pipeline is connected to the steam inlet of the SOEC, and the other end is connected to the steam supply module, and the steam supply module can receive steam generated by external renewable energy; An oxygen transmission pipeline, one end of which is connected to the oxygen exhaust port of the SOEC, and the other end of which is connected to the oxygen exhaust port of the external atmosphere; A hydrogen transmission pipeline and a solid-state hydrogen storage device, wherein one end of the hydrogen transmission pipeline is connected to the SOEC hydrogen discharge port, and the other end is connected to the solid-state hydrogen storage device.

[0007] A solid oxide electrolysis hydrogen production system provided according to the present invention further includes: a heating temperature equalizer, which is arranged on the steam transmission pipeline and the air transmission pipeline at the same time.

[0008] A solid oxide electrolysis hydrogen production system provided according to the present invention also includes: a hydrogen storage pump, a condenser and a water separator, wherein the hydrogen storage pump, the condenser and the water separator are arranged on the hydrogen transmission pipeline and are arranged in sequence in a direction from the SOEC hydrogen outlet to the solid-state hydrogen storage device.

[0009] A solid oxide electrolysis hydrogen production system provided according to the present invention also includes: a first transmission pipeline and a cooling water pump, one end of the first transmission pipeline is connected to an external cooling water source, and the other end is connected to the steam transmission pipeline, the solid-state hydrogen storage device and the cooling water pump are arranged on the first transmission pipeline and are arranged in sequence at intervals in the direction from the cooling water source to the steam transmission pipeline.

[0010] A solid oxide electrolysis hydrogen production system provided according to the present invention also includes: a first heat exchanger, which is arranged between the hydrogen transmission pipeline and the steam transmission pipeline and is located downstream of the connection position between the first transmission pipeline and the steam transmission pipeline.

[0011] A solid oxide electrolysis hydrogen production system provided according to the present invention also includes: a second transmission pipeline, a liquid water circulation pump, a water tank and an electrolysis water source pump, one end of the second transmission pipeline is connected to the water separator, and the other end is connected to the steam transmission pipeline, the liquid water circulation pump, the water tank and the electrolysis water source pump are arranged on the second transmission pipeline and are arranged in sequence from the water separator to the steam transmission pipeline.

[0012] A solid oxide electrolysis hydrogen production system provided according to the present invention further includes: a second heat exchanger, wherein the second heat exchanger is arranged between the second transmission pipeline and the hydrogen transmission pipeline.

[0013] A solid oxide electrolysis hydrogen production system provided according to the present invention also includes: a third transmission pipeline and a hydrogen circulation pump, one end of the third transmission pipeline is connected to the hydrogen transmission pipeline, and the other end is connected to the steam transmission pipeline, and the hydrogen circulation pump is arranged on the third transmission pipeline.

[0014] A solid oxide electrolysis hydrogen production system provided according to the present invention also includes: a steam buffer tank and a steam valve, wherein the steam buffer tank and the steam valve are arranged on the steam transmission pipeline and are arranged in sequence from the steam supply module to the SOEC steam inlet.

[0015] A solid oxide electrolysis hydrogen production system provided according to the present invention further includes: a third heat exchanger and a fourth heat exchanger, and the third heat exchanger and the fourth heat exchanger are both arranged between the air transmission pipeline and the oxygen transmission pipeline.

[0016] The solid oxide electrolysis hydrogen production system provided by the present invention comprises: a SOEC module, an air transmission pipeline, a steam transmission pipeline and a steam supply module, an oxygen transmission pipeline, a hydrogen transmission pipeline and a solid-state hydrogen storage device, which can convert the electrical energy generated by renewable energy into chemical energy and store it. Compared with traditional electric energy storage methods, the SOEC module can convert electrical energy into hydrogen and store it in a solid-state hydrogen storage manner. It has high energy conversion efficiency and a wide range of applications. There will be no loss of stored energy during long-term energy storage. Moreover, the high-temperature steam generated by the power supply equipment during the power generation process can be further utilized, and the energy utilization rate is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic structural diagram of a solid oxide electrolysis hydrogen production system coupled with fluctuating power supply and steam supply according to one embodiment of the present invention.

[0019] Figure 2 It is a schematic diagram of the structure of a power supply circuit of a solid oxide electrolysis hydrogen production system coupled with fluctuating power supply and steam supply according to one embodiment of the present invention.

[0020] Figure 3 It is a schematic diagram of the installation of a solid-state hydrogen storage device of a solid oxide electrolysis hydrogen production system coupled with fluctuating power supply and steam supply according to one embodiment of the present invention.

[0021] Reference numerals: 10. SOEC module; 11. SOEC air inlet; 12. SOEC steam inlet; 13. SOEC oxygen outlet; 14. SOEC hydrogen outlet; 20. Air transmission pipeline; 21. External atmospheric air inlet; 22. Air compressor; 23. Heating thermostat; 24. First heat exchanger; 25. Third heat exchanger; 26. Fourth heat exchanger; 30. Steam transmission pipeline; 31. Steam supply module; 32. First three-way valve; 33. Four-way valve; 34. Steam buffer tank; 35. Steam valve; 40. Oxygen transmission pipeline; 41. External atmospheric oxygen outlet; 50. Hydrogen transmission pipeline; 51. Solid-state hydrogen storage device; 511. Magnesium-based hydrogen storage alloy particles; 512. Cooling water channel; 513, third additional three-way valve; 514, safety valve; 515, hydrogen exhaust source; 516, switch solenoid valve; 52, hydrogen storage pump; 53, condenser; 54, water distributor; 55, second heat exchanger; 56, second three-way valve; 60, power supply line; 61, local or national power grid; 62, electrolysis power supply network; 70, first transmission pipeline; 71, cooling water pump; 72, cooling water source; 73, impurity filter; 74, first additional three-way valve; 75, additional water tank; 76, second additional three-way valve; 80, second transmission pipeline; 81, liquid water circulation pump; 82, water tank; 83, electrolysis water source water pump; 90, third transmission pipeline; 91, hydrogen circulation pump. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In one embodiment of the present invention, a solid oxide electrolysis hydrogen production system is provided, which includes a SOEC module and a steam supply module. The SOEC module can receive steam generated by an external power supply device that uses renewable energy to generate electricity through the steam supply module. The SOEC module can also receive electric energy generated by an external power supply device that uses renewable energy to generate electricity through a power supply line. The SOEC module can thus use steam and electric energy to electrolyze hydrogen, thereby converting the electric energy into chemical energy for storage. With the help of this system, on the one hand, energy can be stored for a long time according to demand, and the application scenarios are wide. On the other hand, the high-temperature steam generated by the power supply device based on renewable energy can be recycled and utilized, and the energy utilization rate is high. The following is combined with Figures 1 to 3 The solid oxide electrolysis hydrogen production system in this embodiment is further described.

[0024] Specifically, if Figure 1 As shown, the solid oxide electrolysis hydrogen production system in this embodiment includes: a SOEC module 10, an air transmission pipeline 20, a steam transmission pipeline 30 and a steam supply module 31, an oxygen transmission pipeline 40, a hydrogen transmission pipeline 50 and a solid hydrogen storage device 51.

[0025] Among them, the SOEC module 10 has a SOEC air inlet 11, a SOEC steam inlet 12, a SOEC oxygen exhaust port 13 and a SOEC hydrogen exhaust port 14; one end of the air transmission pipeline 20 is connected to the SOEC air inlet 11, and the other end is connected to the external atmospheric air inlet 21; one end of the steam transmission pipeline 30 is connected to the SOEC steam inlet 12, and the other end is connected to the steam supply module 31, and the steam supply module 31 can receive steam generated by external renewable energy; one end of the oxygen transmission pipeline 40 is connected to the SOEC oxygen exhaust port 13, and the other end is connected to the external atmospheric oxygen exhaust port 41; one end of the hydrogen transmission pipeline 50 is connected to the SOEC hydrogen exhaust port 14, and the other end is connected to the solid-state hydrogen storage device 51.

[0026] Exemplarily, the SOEC module 10 is a solid oxide electrolysis stack having two inlets and two outlets, the two inlets being a SOEC air inlet 11 and a SOEC steam inlet 12, through which external air and steam can enter the SOEC module 10 respectively, and the two outlets being a SOEC oxygen exhaust port 13 and a SOEC hydrogen exhaust port 14, after the SOEC module 10 is powered on and electrolysis is performed, oxygen and hydrogen can be generated, and the generated oxygen and hydrogen can be supplied to the outside world through the SOEC oxygen exhaust port 13 and the SOEC hydrogen exhaust port 14 respectively.

[0027] Exemplarily, the air transmission pipeline 20 can be a conventional metal or non-metallic pipe, which is connected between the SOEC air inlet 11 and the external atmosphere air inlet 21. The air in the external environment can enter the air transmission pipeline 20 through the external atmosphere air inlet 21, and then the air transmission pipeline 20 can transmit the air to the SOEC air inlet 11.

[0028] Optionally, in order to allow air in the external environment to be absorbed into the air delivery pipeline 20, as Figure 1 As shown, an air compressor 22 may also be provided on the air transmission pipeline 20 , and the air compressor 22 can draw air from the external environment into the air transmission pipeline 20 when working.

[0029] Exemplarily, the steam supply module 31 can be connected to the discharge port of an external renewable energy power generation device. For example, the steam supply module 31 can be connected to the discharge port of a power generation device that generates electricity through solar energy, wind energy, tidal energy or geothermal energy. The high-temperature steam generated by the power generation device during operation can be received by the steam supply module 31, and then the steam supply module 31 can transmit the high-temperature steam to the steam inlet of the SOEC, which can avoid direct discharge of low-temperature, low-grade steam generated by renewable energy. At this time, the system in this embodiment can also be used in forests and mines without waste heat steam.

[0030] Exemplarily, the oxygen transmission pipeline 40 can be a conventional oxidation-resistant metal or non-metallic pipeline. The oxygen transmission pipeline 40 is connected between the SOEC oxygen exhaust port 13 and the external atmosphere oxygen exhaust port 41. After the SOEC module 10 is powered on and generates oxygen, the generated oxygen can be transported to the oxygen transmission pipeline 40 via the SOEC oxygen exhaust port 13, and then transmitted to the outside world or related oxygen storage devices via the external atmosphere oxygen exhaust port 41.

[0031] In the related technology, the storage of hydrogen is a challenging task, and the conventional method is high-pressure gaseous hydrogen storage or liquid hydrogen storage. However, the hydrogen storage technology of high-pressure gaseous hydrogen storage is easy to use, but the hydrogen storage volume density is also low, and the investment cost of high-pressure compressors and high-pressure hydrogen storage tanks is high; although liquid hydrogen storage can increase the hydrogen storage volume density, hydrogen is extremely difficult to liquefy, and the liquefaction device has a high technical threshold, poor reliability, and serious energy waste. Solid-state hydrogen storage can complete hydrogen storage at normal pressure and temperature, with simple equipment and large hydrogen storage capacity.

[0032] Based on this, in the present embodiment, the solid-state hydrogen storage device 51 can store hydrogen in the form of solid-state hydrogen storage. For example, hydrogen storage alloys can be provided inside the solid-state hydrogen storage device 51, and these hydrogen storage alloys can be used to achieve solid-state hydrogen storage.

[0033] In a specific embodiment, the solid-state hydrogen storage device 51 can be constructed as a can-shaped or barrel-shaped sealed device, and the solid-state hydrogen storage device 51 is provided with magnesium-based hydrogen storage alloys, iron-based hydrogen storage alloys, lanthanum-nickel rare earth-based hydrogen storage alloys, titanium-based hydrogen storage alloys, zirconium-based hydrogen storage alloys, etc. Considering the material cost and technical maturity, in a preferred embodiment, the solid-state hydrogen storage device 51 is provided with magnesium-based hydrogen storage alloys, and the magnesium-based hydrogen storage alloys can be made into 0.1nm~30μm solid particles filled in the device.

[0034] Accordingly, the hydrogen transmission pipeline 50 can be a conventional metal or non-metallic pipeline. The hydrogen transmission pipeline 50 is connected between the SOEC hydrogen exhaust port 14 and the solid-state hydrogen storage device 51. After the SOEC module 10 is powered on and generates hydrogen, the generated hydrogen can be transported to the hydrogen transmission pipeline 50 via the SOEC hydrogen exhaust port 14, and then enter the solid-state hydrogen storage device 51 for storage.

[0035] The SOEC module 10 can receive electric energy generated by an external renewable energy power generation device through a power supply line 60 .

[0036] In one embodiment, Figure 2 As shown, the power supply line 60 includes a local or national power grid 61 and an electrolysis power grid 62, wherein the local or national power grid 61 can be connected to a power generation device using renewable energy, and the electrolysis power grid 62 is connected between the local or national power grid 61 and the SOEC module 10. Therefore, when the power generation device using renewable energy generates electricity, the electric energy can be transmitted to the local or national power grid 61, and then transmitted to the SOEC module 10 via the electrolysis power grid 62.

[0037] Alternatively, if Figure 2 As shown, the power generation equipment using renewable energy may be a power generation equipment that generates electricity through solar energy, wind energy, tidal energy or geothermal energy.

[0038] In actual use, after the power generation equipment uses renewable energy such as solar energy, wind energy, etc. to generate electricity, this electricity can be transmitted to the SOEC module 10 via the power supply line 60. At the same time, the high-temperature steam generated by the power generation equipment can also be absorbed by the steam supply module 31 and transmitted to the SOEC module 10 via the steam transmission pipeline 30. The atmosphere in the external environment can also enter the air transmission pipeline 20 through the external atmosphere air inlet 21 and then enter the SOEC module 10. The SOEC module 10 can perform electrolysis and produce hydrogen and oxygen. The generated hydrogen can enter the solid-state hydrogen storage device 51, thereby converting electrical energy into chemical energy and storing it.

[0039] It can be understood that in addition to using solar energy and wind energy to generate electricity, power generation equipment can also use renewable energy such as geothermal energy and tidal energy to generate electricity.

[0040] Moreover, when the SOEC module 10 is powered, the power supply line 60 can be set by the electronic control device to power the SOEC module 10 when the electric energy supplied by the power generation equipment fluctuates and exceeds the power load. Therefore, the solid oxide electrolysis hydrogen production system in this embodiment can also be electrically connected to the power generation equipment with periodic or non-periodic fluctuations through the power supply line 60, which can receive electric energy according to the fluctuation state of the power supply, consume the excess electric energy generated by the power generation equipment, and store the electric energy in the form of chemical energy for future use.

[0041] It can be seen that with the help of the solid oxide electrolysis hydrogen production system in this embodiment, it is possible to convert the electrical energy generated by renewable energy into chemical energy and store it. Compared with traditional power energy storage methods, the SOEC module 10 can convert electrical energy into hydrogen and store it in the form of solid hydrogen storage. It has high energy conversion efficiency and a wide range of applications. There will be no loss of stored energy during long-term energy storage. Moreover, the high-temperature steam generated by the power supply equipment during the power generation process can be further utilized, and the energy utilization rate is high.

[0042] Further, in this embodiment, if Figure 1 As shown, the solid oxide electrolysis hydrogen production system further includes: a heating temperature equalizer 23 , which is disposed on both the steam transmission pipeline 30 and the air transmission pipeline 20 .

[0043] In practice, there may be heat attenuation when steam and air are transmitted in the steam transmission pipeline 30 and the air transmission pipeline 20 respectively, resulting in insufficient temperature of the steam and air when they enter the SOEC module 10. Therefore, the heating thermostat 23 provided in this embodiment can adopt electric heating or fuel combustion heating to heat the steam in the steam transmission pipeline 30 and the air in the air transmission pipeline 20 at the same time, so that the steam and air entering the SOEC module 10 have approximately the same temperature, thereby reducing the temperature difference of the fuel cell stack and improving the system operation reliability.

[0044] Further, in this embodiment, if Figure 1 As shown, the solid oxide electrolysis hydrogen production system also includes: a hydrogen storage pump 52, a condenser 53 and a water separator 54. The hydrogen storage pump 52, the condenser 53 and the water separator 54 are arranged on the hydrogen transmission pipeline 50 and are arranged in sequence in the direction from the SOEC hydrogen outlet 14 to the solid hydrogen storage device 51.

[0045] Exemplarily, the hydrogen storage pump 52 is a pumping mechanism, which can make the hydrogen in the hydrogen transmission pipeline 50 flow from the SOEC hydrogen outlet 14 toward the solid hydrogen storage device 51 during operation.

[0046] Moreover, the gas entering the hydrogen transmission pipeline 50 from the SOEC hydrogen discharge port 14 generally includes water vapor in addition to hydrogen, that is, the gas entering the hydrogen transmission pipeline 50 through the SOEC hydrogen discharge port 14 is a mixed gas of hydrogen and water vapor. In order to effectively separate the hydrogen and water vapor, the condenser 53 can cool the gas in the hydrogen transmission pipeline 50 so that the water vapor in the mixed gas in the hydrogen transmission pipeline 50 is condensed into liquid water.

[0047] The water separator 54 can effectively separate the hydrogen and liquid water in the hydrogen transmission pipeline 50 .

[0048] In actual use, after the SOEC module 10 performs electrolysis to produce hydrogen, a mixed gas formed by high-temperature hydrogen and water vapor will enter the hydrogen transmission pipeline 50 through the SOEC hydrogen discharge port 14, and the hydrogen storage pump 52 can drive the mixed gas to flow toward the solid-state hydrogen storage device 51. Moreover, when the mixed gas flows to the condenser 53, the high-temperature water vapor condenses into liquid water. Then, the mixture formed by hydrogen and liquid water is separated into steam and water in the water separator 54, and the relatively dry gaseous hydrogen continues to flow toward the solid-state hydrogen storage device 51, while the liquid water remains in the water separator 54.

[0049] Further, in one embodiment, Figure 1 As shown, the solid oxide electrolysis hydrogen production system also includes: a first transmission pipeline 70 and a cooling water pump 71, one end of the first transmission pipeline 70 is connected to an external cooling water source 72, and the other end is connected to the steam transmission pipeline 30, the solid hydrogen storage device 51 and the cooling water pump 71 are arranged on the first transmission pipeline 70 and are arranged in sequence in the direction from the cooling water source 72 to the steam transmission pipeline 30.

[0050] Exemplarily, after hydrogen enters the solid-state hydrogen storage device 51, the solid-state hydrogen storage device 51 will still have a certain high temperature. Moreover, solid-state hydrogen storage is an exothermic process and heat dissipation is necessary. In order to cool the solid-state hydrogen storage device 51 and improve the utilization efficiency of heat, the first transmission pipeline 70 can be arranged on the solid-state hydrogen storage device 51, and the external cooling water source 72 can provide low-temperature cooling water.

[0051] In one embodiment, the outer wall of the solid hydrogen storage device 51 may be provided with a mechanism for liquid water circulation, such as a circulation structure surrounded by ceramic spacer plates, metal fin plates, or a pipeline-based circulation structure, and the first transmission pipeline 70 is connected to the circulation mechanism. In this embodiment, it is preferably set to a pipeline-based circulation structure.

[0052] In actual use, the cooling water pump 71 can pump the low-temperature cooling water from the cooling water source 72 to the first transmission pipeline 70. When the low-temperature cooling water flows through the solid-state hydrogen storage device 51, it can flow into the circulation mechanism and then flow out of the circulation mechanism. The low-temperature cooling water can take away the heat of the solid-state hydrogen storage device 51 during the flow, and cool the solid-state hydrogen storage device 51, so that the solid-state hydrogen storage device 51 can better realize solid-state hydrogen storage for hydrogen. The low-temperature cooling water that absorbs heat becomes high-temperature water vapor or a steam-water mixture and can flow to the steam transmission pipeline 30. The high-temperature water vapor or steam-water mixture can be used as a raw material for the electrolysis reaction and is transported to the SOEC module 10 along with the steam in the steam transmission pipeline 30, thereby improving the energy efficiency of the system.

[0053] In a specific embodiment, Figure 1 As shown, a first three-way valve 32 is provided on the steam transmission pipeline 30 , and the end of the first transmission pipeline 70 is connected to the first three-way valve 32 . At this time, the first transmission pipeline 70 can be connected to the steam transmission pipeline 30 by means of the first three-way valve 32 .

[0054] Optionally, in order to ensure that the solid-state hydrogen storage device 51 can effectively realize solid-state hydrogen storage, as Figure 3 As shown, the mixed gas of hydrogen and water vapor in the hydrogen transmission pipeline 50 flows into the water separator 54 to separate the steam and water, and the relatively dry hydrogen enters the impurity filter 73 to facilitate impurity filtration, and further remove part or all of the water vapor or other possible impurities (such as oxygen) in the hydrogen until the downstream equipment meets the requirements for hydrogen storage, transportation, and use. The hydrogen after impurity filtration enters the solid hydrogen storage device 51, and the interior of the solid hydrogen storage device 51 is filled with magnesium-based hydrogen storage alloy particles 511.

[0055] A cooling water channel 512 is also provided inside the solid hydrogen storage device 51, and both ends of the cooling water channel 512 are connected to the first transmission pipeline 70. When the cooling water pump 71 is working, the cooling water of the cooling water source can enter the cooling water channel 512 via the first transmission pipeline 70, and the magnesium-based hydrogen storage alloy particles 511 can be cooled. The cooling water after cooling the solid hydrogen storage device 51 can continue to enter the first additional three-way valve 74, and the cooling water flowing out of the first additional three-way valve 74 is divided into two parts, one part of which flows into the additional water tank 75, and the other part flows into the second additional three-way valve 76, and the cooling water in the additional water tank 75 can also flow into the second additional three-way valve 76. The cooling water flowing out of the second additional three-way valve 76 forms a hot water or steam exhaust source and can be transmitted to the steam transmission pipeline 30. Moreover, when the demand for hot water or steam in the steam transmission pipeline 30 decreases, the cooling water flowing out of the first additional three-way valve 74 can flow into the additional water tank 75 and be temporarily stored.

[0056] The solid-state hydrogen storage device 51 is also connected to a third additional three-way valve 513, the two outlets of which are respectively connected to a safety valve 514 and a hydrogen discharge source 515, and a switch solenoid valve 516 is provided between the hydrogen discharge source 515 and the third additional three-way valve 513. In actual use, when the hydrogen in the solid-state hydrogen storage device 51 needs to be used, the switch solenoid valve 516 can be opened to allow the hydrogen in the solid-state hydrogen storage device 51 to flow into the hydrogen discharge source 515 via the third additional three-way valve 513 and the switch solenoid valve 516 in sequence. Moreover, by providing the safety valve 514, the need for hydrogen discharge in an emergency can be met.

[0057] In addition, the solid-state hydrogen storage device 51 can also be installed with a pressure gauge and a temperature gauge to facilitate monitoring and feedback of the hydrogen storage status of the solid-state hydrogen storage. Accordingly, the solid-state hydrogen storage device 51 can be further connected to a controller to facilitate real-time judgment of the safety status of the solid-state hydrogen storage.

[0058] Further, in one embodiment, Figure 1 As shown, the solid oxide electrolysis hydrogen production system also includes: a first heat exchanger 24, which is arranged between the hydrogen transmission pipeline 50 and the steam transmission pipeline 30, and is located downstream of the connection position between the first transmission pipeline 70 and the steam transmission pipeline 30.

[0059] Exemplarily, the hydrogen generated by electrolysis in the SOEC module 10 has a certain high temperature, and the steam in the steam transmission pipeline 30 may decrease in temperature during the transmission process. Moreover, in the first transmission pipeline 70, after the liquid water from the cooling water pump 71 exchanges heat with the solid hydrogen storage device 51, the temperature of the mixed gas formed after the heat exchange of these liquid waters is not high. Therefore, by setting the first heat exchanger 24, the mixed gas formed by the mixed gas from the first transmission pipeline 70 and the steam from the steam supply module 31 can receive the heat transferred by the hydrogen in the hydrogen transmission pipeline 50, so that the mixture in the steam transmission pipeline 30 can be heated up before entering the SOEC module 10.

[0060] Further, in one embodiment, Figure 1 As shown, the solid oxide electrolysis hydrogen production system also includes: a second transmission pipeline 80, a liquid water circulation pump 81, a water tank 82 and an electrolysis water source pump 83. One end of the second transmission pipeline 80 is connected to the water separator 54, and the other end is connected to the steam transmission pipeline 30. The liquid water circulation pump 81, the water tank 82 and the electrolysis water source pump 83 are arranged on the second transmission pipeline 80 and are arranged in sequence in the direction from the water separator 54 to the steam transmission pipeline 30.

[0061] Exemplarily, both ends of the second transmission pipeline 80 are connected to the water separator 54 and the steam transmission pipeline 30 respectively, the liquid water circulation pump 81 is a pumping mechanism, which can pump the liquid water in the water separator 54 to the water tank 82 and temporarily store it in the water tank 82, and the electrolyzed water source pump 83 is also a pumping mechanism, which can pump the liquid water stored in the water tank 82 to the steam transmission pipeline 30. Thus, the liquid water in the water separator 54 can enter the steam transmission pipeline via the second transmission pipeline 80.

[0062] It can be understood that in this embodiment, by arranging the water tank 82 downstream of the liquid water circulation pump 81, and the water outlet of the water tank 82 can be arranged at the bottom. The liquid water in the water tank 82 flows out to the electrolytic water source pump 83, which can buffer the pressure fluctuation of the circulating liquid water and reduce the idling frequency of the electrolytic water source pump 83, thereby improving the reliability of system operation.

[0063] In addition, according to actual installation requirements, the liquid water circulation pump 81 may also be omitted.

[0064] Further, in one embodiment, Figure 1 As shown, the solid oxide electrolysis hydrogen production system further includes: a second heat exchanger 55 , which is disposed between the second transmission pipeline 80 and the hydrogen transmission pipeline 50 .

[0065] Exemplarily, the liquid water in the water tank 82 can be pumped to the steam transmission pipeline 30 via the electrolytic water source pump 83, however, the temperature of the liquid water is not high. Based on this, by providing the second heat exchanger 55, the liquid water from the water tank 82 can receive the heat of the hydrogen in the hydrogen transmission pipeline 50, so that the liquid water in the water tank 82 can be heated before entering the steam transmission pipeline 30.

[0066] Further, in one embodiment, Figure 1 As shown, the solid oxide electrolysis hydrogen production system also includes: a third transmission pipeline 90 and a hydrogen circulation pump 91, one end of the third transmission pipeline 90 is connected to the hydrogen transmission pipeline 50, and the other end is connected to the steam transmission pipeline 30, and the hydrogen circulation pump 91 is arranged on the third transmission pipeline 90.

[0067] Exemplarily, both ends of the third transmission pipeline 90 are respectively connected to the hydrogen transmission pipeline 50 and the steam transmission pipeline 30 , and the hydrogen circulation pump 91 is a pumping mechanism that can pump the mixed gas containing hydrogen in the hydrogen transmission pipeline 50 into the steam transmission pipeline 30 .

[0068] In a specific embodiment, Figure 1As described, a second three-way valve 56 is provided on the hydrogen transmission pipeline 50, and one end of the third transmission pipeline 90 is connected to the second three-way valve 56. At this time, the third transmission pipeline 90 can be connected to the hydrogen transmission pipeline 50 with the help of the second three-way valve 56. Moreover, the second three-way valve 56 can be used as a diversion node. By controlling the opening of the second three-way valve 56, the hydrogen from the SOEC module 10 can be reasonably distributed and transported to the solid hydrogen storage device 51 and the steam transmission pipeline 30.

[0069] Furthermore, the flow rate of the circulating steam entering the steam transmission pipeline 30 via the third transmission pipeline 90 can be controlled by adjusting the rotation speed of the hydrogen circulation pump 91 and the opening degree of the second three-way valve 56 .

[0070] In order to ensure that the second transmission pipeline 80 and the third transmission pipeline 90 can be effectively connected to the steam transmission pipeline 30, in one embodiment, as shown in FIG. Figure 1 As shown, a four-way valve 33 is provided on the steam transmission pipeline 30, and one end of the second transmission pipeline 80 and one end of the third transmission pipeline 90 are simultaneously connected to the four-way valve 33. At this time, the second transmission pipeline 80 and the third transmission pipeline 90 can be connected to the steam transmission pipeline 30 via the four-way valve 33.

[0071] Moreover, the four-way valve 33 serves as the confluence node of the second transmission pipeline 80, the third transmission pipeline 90 and the steam transmission pipeline 30. By adjusting the opening of different connecting ports in the four-way valve 33, the confluence ratio of the steam on both sides of the confluence of the second transmission pipeline 80 and the third transmission pipeline 90 can be controlled and adjusted.

[0072] Further, in one embodiment, Figure 1 As shown, the solid oxide electrolysis hydrogen production system also includes: a steam buffer tank 34 and a steam valve 35, which are arranged on the steam transmission pipeline 30 and are arranged in sequence from the steam supply module 31 to the SOEC steam inlet.

[0073] For example, after the steam generated by the power supply equipment of renewable energy is received by the steam supply module 31, the steam can flow into the steam buffer tank 34 and be temporarily stored, which can facilitate the pressure and flow regulation of the downstream steam valve 35 and the first three-way valve 32. The steam valve 35 is arranged between the steam buffer tank 34 and the first three-way valve 32. In actual use, the steam valve 35 can be opened and closed according to the needs of the electrolysis system, thereby controlling the release state of the steam to the outside.

[0074] Further, in one embodiment, Figure 1As shown, the solid oxide electrolysis hydrogen production system further includes: a third heat exchanger 25 and a fourth heat exchanger 26 , and the third heat exchanger 25 and the fourth heat exchanger 26 are both arranged between the air transmission pipeline 20 and the oxygen transmission pipeline 40 .

[0075] Exemplarily, the third heat exchanger 25 and the fourth heat exchanger 26 may be arranged in sequence and spaced apart from each other on the oxygen transmission pipeline 40 in a direction from the SOEC hydrogen discharge port 14 toward the external atmosphere oxygen discharge port 41 .

[0076] In actual use, when outside air enters the SOEC air inlet 11 through the air transmission pipeline 20, the oxygen output from the SOEC oxygen outlet can also flow in the oxygen transmission pipeline 40. During the flow of air and oxygen, the third heat exchanger 25 and the fourth heat exchanger 26 can be used to transfer the heat of the oxygen in the oxygen transmission pipeline 40 to the air in the air transmission pipeline 20, so that the air in the air transmission pipeline 20 is heated and then transported to the SOEC module 10.

[0077] Compared with the existing technology, the solid oxide electrolysis hydrogen production system in this embodiment can combine renewable energy power supply technology, solid oxide electrolysis stack technology, renewable energy steam utilization technology, and solid hydrogen storage technology. It can improve the energy utilization efficiency of industrial systems, reduce energy costs and material costs, increase energy storage cycles, improve the adjustability of renewable energy power supply, increase renewable energy application scenarios, and contribute to the sustainable development of the economy and society.

[0078] Moreover, the present embodiment proposes a scheme for diverting low-temperature media (liquid water or low-temperature steam) to improve the utilization efficiency of the heat exchanger and the enthalpy energy utilization rate of the high-temperature gas discharged from the solid oxide electrolysis reactor, reduce the heating workload of the heat exchanger, reduce the cost of components, and improve the versatility of components.

[0079] In addition, in this embodiment, the gas on both sides of the inlet of the electrolytic stack can be electrically heated at the same time, thereby reducing the temperature difference of the stack and improving the reliability of system operation.

[0080] The solid oxide electrolysis hydrogen production system in this embodiment can also be used in forests and mines where there is no waste heat steam.

[0081] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative effort.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A solid oxide electrolysis hydrogen production system, characterized in that: include: A SOEC module, wherein the SOEC module has a SOEC air inlet, a SOEC steam inlet, a SOEC oxygen exhaust port, and a SOEC hydrogen exhaust port; An air transmission pipeline, one end of which is connected to the air inlet of the SOEC, and the other end of which is connected to the air inlet of the outside atmosphere; A steam transmission pipeline and a steam supply module, wherein one end of the steam transmission pipeline is connected to the steam inlet of the SOEC, and the other end is connected to the steam supply module, and the steam supply module can receive steam generated by external renewable energy; An oxygen transmission pipeline, one end of which is connected to the oxygen exhaust port of the SOEC, and the other end of which is connected to the oxygen exhaust port of the external atmosphere; A hydrogen transmission pipeline and a solid-state hydrogen storage device, wherein one end of the hydrogen transmission pipeline is connected to the SOEC hydrogen discharge port, and the other end is connected to the solid-state hydrogen storage device.

2. The solid oxide electrolysis hydrogen production system according to claim 1, characterized in that: Also includes: A heating thermostat is provided on both the steam transmission pipeline and the air transmission pipeline.

3. The solid oxide electrolysis hydrogen production system according to claim 1, characterized in that: Also includes: A hydrogen storage pump, a condenser and a water separator, wherein the hydrogen storage pump, the condenser and the water separator are arranged on the hydrogen transmission pipeline and are arranged in sequence and spaced apart in the direction from the SOEC hydrogen discharge port to the solid-state hydrogen storage device.

4. The solid oxide electrolysis hydrogen production system according to claim 1, characterized in that: Also includes: A first transmission pipeline and a cooling water pump, one end of the first transmission pipeline is connected to an external cooling water source, and the other end is connected to the steam transmission pipeline, the solid hydrogen storage device and the cooling water pump are arranged on the first transmission pipeline and are arranged in sequence in the direction from the cooling water source to the steam transmission pipeline.

5. The solid oxide electrolysis hydrogen production system according to claim 4, characterized in that: Also includes: A first heat exchanger, wherein the first heat exchanger is disposed between the hydrogen transmission pipeline and the steam transmission pipeline and is located downstream of a position where the first transmission pipeline and the steam transmission pipeline are connected.

6. The solid oxide electrolysis hydrogen production system according to claim 3, characterized in that: Also includes: A second transmission pipeline, a liquid water circulation pump, a water tank and an electrolytic water source water pump, one end of the second transmission pipeline is connected to the water distributor, and the other end is connected to the steam transmission pipeline, the liquid water circulation pump, the water tank and the electrolytic water source water pump are arranged on the second transmission pipeline and are arranged in sequence from the water distributor to the steam transmission pipeline.

7. The solid oxide electrolysis hydrogen production system according to claim 6, characterized in that: Also includes: A second heat exchanger is disposed between the second transmission pipeline and the hydrogen transmission pipeline.

8. The solid oxide electrolysis hydrogen production system according to claim 1, characterized in that: Also includes: A third transmission pipeline and a hydrogen circulation pump, one end of the third transmission pipeline is connected to the hydrogen transmission pipeline, and the other end is connected to the steam transmission pipeline, and the hydrogen circulation pump is arranged on the third transmission pipeline.

9. The solid oxide electrolysis hydrogen production system according to claim 1, characterized in that: Also includes: A steam buffer tank and a steam valve, wherein the steam buffer tank and the steam valve are arranged on the steam transmission pipeline and are arranged in sequence from the steam supply module to the SOEC steam inlet.

10. The solid oxide electrolysis hydrogen production system according to claim 1, characterized in that: Also includes: A third heat exchanger and a fourth heat exchanger, wherein the third heat exchanger and the fourth heat exchanger are both arranged between the air transmission pipeline and the oxygen transmission pipeline.

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