Solid oxide electrolytic hydrogen production device

Abstract

The invention provides a solid oxide electrolytic hydrogen production device, relates to the technical field of water electrolysis hydrogen production, and aims to solve the technical problem that energy is wasted due to the fact that energy in an oil field is not fully utilized. The first flow path comprises a water injection port and a water outlet, the second flow path comprises a preheating medium inlet and a preheating medium outlet, heat exchange can be conducted between the first flow path and the second flow path, and the first flow path and the second flow path are used for preheating water flowing through the first flow path; the water vapor generator is communicated with the water outlet and is used for converting the preheated water into water vapor; and the electrolysis device is connected with the water vapor generator, and the water vapor flowing out of the water vapor generator can be subjected to electrolytic reaction on the electrolysis device to generate hydrogen. The first heat exchanger is arranged in front of the water vapor generator, so that the generation rate of water vapor can be increased, and meanwhile, energy is saved.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen production by water electrolysis, and in particular to a solid oxide electrolysis hydrogen production device. Background Art

[0002] Existing oil fields contain a large amount of heat, which is not fully utilized at present, resulting in energy waste. The front end of the solid oxide electrolysis hydrogen production system usually requires a heating device to heat the raw gas, but this part of the energy in the oil field is not fully utilized, thus wasting energy.

[0003] Therefore, how to achieve the rational use of energy is a technical problem that needs to be solved urgently. Summary of the invention

[0004] In view of this, the present invention aims to solve the technical problem that the energy in the oil field is not fully utilized, resulting in energy waste.

[0005] The technical solution of the present invention provides a solid oxide electrolysis hydrogen production device.

[0006] The solid oxide electrolysis hydrogen production device provided by the present invention includes: a first heat exchanger, including a first flow path and a second flow path, the first flow path includes a water injection port and a water outlet, the second flow path includes a preheating medium inlet and a preheating medium outlet, and heat exchange can be performed between the first flow path and the second flow path, which is used to preheat the water flowing through the first flow path; a steam generator, which is connected to the water outlet, and is used to vaporize the preheated water into water vapor; an electrolysis device, which is connected to the steam generator, and the water vapor flowing out of the steam generator can undergo an electrolysis reaction on the electrolysis device to generate hydrogen.

[0007] The solid oxide electrolysis hydrogen production device provided by the present invention includes a first heat exchanger, a water vapor generator and an electrolysis device, the first heat exchanger includes a first flow path and a second flow path, the first flow path includes a water injection port and a water outlet, the second flow path includes a preheating medium inlet and a preheating medium outlet, heat exchange can be performed between the first flow path and the second flow path, the water vapor generator is connected to the water outlet, and is used to vaporize the preheated water into water vapor, the electrolysis device is connected to the water vapor generator, and the water vapor can undergo an electrolysis reaction on the electrolysis device. The present application sets a first heat exchanger in front of the water vapor generator, and then uses a high-temperature preheating medium to preheat the water, so that the water can be preheated in advance before generating water hydrogen, so that the generation rate of water vapor can be increased, and the efficiency of electrolytic hydrogen production in the later stage can be improved.

[0008] In the above technical solution, the associated gas at a first preset temperature is introduced into the second flow path through the preheating medium inlet, and the first preset temperature is greater than or equal to 80°C.

[0009] In this technical solution, the high-temperature associated gas can be introduced into the second flow path through the preheating medium inlet to preheat the water in the first flow path. In this way, the energy in the associated gas can be recovered and utilized, saving energy. It can be understood that usually, during the collection of associated gas, the high-temperature associated gas needs to be cooled to room temperature and then stored, which results in the waste of the heat in the high-temperature associated gas. However, in this application, the associated gas is used to preheat the water, which can improve the production efficiency of water vapor, realize the rational utilization of energy, and at the same time, the associated gas can be cooled and stored. Further, the first preset temperature is greater than or equal to 80 °C. Further still, the first preset temperature is greater than or equal to 100 °C and less than or equal to 120 °C.

[0010] In the above technical solution, the solid oxide electrolytic hydrogen production device further includes an associated gas storage tank, which is connected to the preheating medium inlet and is used to introduce the stored associated gas at the first preset temperature into the second flow path through the preheating medium inlet.

[0011] In this technical solution, by further setting the associated gas storage tank, it is not necessary to go to the site for electrolytic hydrogen production. The high-temperature associated gas can be pre-stored in the associated gas storage tank in advance, improving the electrolysis efficiency.

[0012] In the above technical solution, the solid oxide electrolytic hydrogen production device further includes a geothermal collector. One end of the geothermal collector is communicated with the preheating medium inlet, and the other end is communicated with the preheating medium outlet. The geothermal collector collects geothermal energy to heat the preheating medium in the geothermal collector by using the geothermal energy. The heated preheating medium is introduced into the second flow path through the preheating medium inlet and flows back to the geothermal collector through the preheating medium outlet.

[0013] In this technical solution, by setting the geothermal collector to preheat the water during the electrolysis process, on the one hand, the geothermal energy of the oil field is fully utilized, avoiding the waste of the geothermal energy of the oil field. On the other hand, using the geothermal energy of the oil field to preheat the water can meet the demand for electrolytic water hydrogen production, so there is no need to additionally set up a heating device, which not only saves costs but also avoids energy waste.

[0014] In the above technical solution, the geothermal collector includes a heat exchange tube. One end of the heat exchange tube is communicated with the preheating medium inlet, and the other end is communicated with the preheating medium outlet. The preheating medium is arranged inside the heat exchange tube.

[0015] In this technical solution, using the heat exchange tube as the geothermal collector can simplify the structure of the geothermal collector and reduce the production cost.

[0016] In the above technical solution, the preheating medium is preheated oil.

[0017] In this technical solution, since the specific heat capacity of oil is relatively large, using preheated oil as the preheating medium can improve the heat exchange efficiency.

[0018] In the above technical solution, the heat exchange tube includes an inner tube and an outer tube. One end of the inner tube is provided with a liquid outlet, and the other end is provided with a communication port. The liquid outlet is communicated with the preheating medium inlet. One end of the communication port of the inner tube extends into the outer tube. The outer tube includes a liquid return port, and the liquid return port is communicated with the preheating medium outlet. The outer surface of the outer tube is in contact with the heat source.

[0019] In this technical solution, the heat exchange tube adopts the design of an outer tube sleeving an inner tube, which can increase the contact area between the heat exchange tube and the heat source, thereby improving the heat exchange efficiency.

[0020] In the above technical solution, the solid oxide electrolysis hydrogen production device further includes a circulator, which is arranged between the geothermal collector and the preheating medium inlet, and is used for introducing the heated preheating medium into the second flow path through the preheating medium inlet.

[0021] In this technical solution, setting the circulator can ensure that the preheating medium can circulate and flow, and ensure the heat exchange efficiency.

[0022] In the above technical solution, the circulator is a circulation pump.

[0023] In the above technical solution, the first heat exchanger is one of a shell-and-tube heat exchanger, a tubular heat exchanger, a plate heat exchanger, and a fin heat exchanger. The surface area of this type of heat exchanger is relatively large, which can improve the heat exchange efficiency.

[0024] In the above technical solution, the solid oxide electrolysis hydrogen production device further includes a heating component, which is arranged between the steam generator and the electrolysis device, and is used for heating the steam flowing out of the steam generator and introducing the heated steam into the electrolysis device to carry out an electrolysis reaction.

[0025] In this technical solution, the heating component can heat the steam flowing out of the steam generator to the electrolysis temperature, and the heated steam can carry out an electrolysis reaction on the electrolysis device.

[0026] In the above technical solution, the solid oxide electrolysis hydrogen production device further includes: a gas mixing device, which is arranged between the steam generator and the heating component; a protective gas generating device, which is connected to the gas mixing device and can generate a protective gas; wherein, the protective gas generated by the protective gas generating device and the steam generated by the steam generator can be mixed in the gas mixing device and flow into the heating component together.

[0027] In this technical solution, the solid oxide electrolysis hydrogen production device further includes a gas mixing device and a protective gas generating device. The gas mixing device is arranged between the steam generator and the heating component, and the protective gas generating device is connected to the gas mixing device and can generate protective gas. In this way, the protective gas generated by the protective gas generating device and the steam generated by the steam generator can be mixed in the gas mixing device and flow into the heating component together. In this way, the protective gas can prevent the cathode of the electrolysis device from being oxidized, that is, prevent the nickel metal from being oxidized, and ensure the smooth progress of the electrolysis reaction. It can be understood that in this application, nickel metal is used as the electrolysis cathode, and by setting the electrolysis environment of the protective gas, the nickel metal can be prevented from being oxidized.

[0028] In the above technical solution, the protective gas generating device is one of a hydrogen generating device, a nitrogen generating device, and a helium generating device.

[0029] In the above technical solution, the electrolysis device includes: a first input end, which is communicated with the heating component, and the heated steam and protective gas can enter the electrolysis device through the first input end; a second input end, which is communicated with the outside air, and the outside air can enter the electrolysis device through the second input end; a first output end, which is used to output the hydrogen generated by electrolysis; and a second output end, which is used to output the oxygen-rich gas generated by electrolysis.

[0030] In this technical solution, the electrolytic water device includes a first input end, a second input end, a first output end, and a second output end. The first input end is communicated with the heating component and can transport the heated steam to the electrolytic water device for electrolysis based on the steam. The second input end is communicated with the outside air and can allow the outside air to enter the electrolysis device to meet the electrolysis requirements. The first output end can output the hydrogen generated by electrolysis, and the second output end can discharge the oxygen-rich air generated by electrolysis. Among them, introducing air through the second input end can also carry out the oxygen generated by electrolysis, maintain the performance of the electrolytic water device, and keep the pressure difference balance on both sides of the electrolytic water device.

[0031] In the above technical solution, the heating component includes: a first heat exchange part, which is connected to the gas mixing device and is used for first-stage heating of the mixed protective gas and steam; a first electric heater, which is connected to the first heat exchange part and the first input end and is used for second-stage heating of the first-stage heated protective gas and steam.

[0032] In this technical solution, by segmented heating, the first heat exchange part is first used to fully utilize the waste heat of the high-temperature gas, the mixed protective gas and water vapor are preheated, and then the first electric heater is used to heat the mixed protective gas and water vapor to the electrolysis temperature, so that the energy utilization efficiency of the system can be improved. It can be understood that, for example, the heat generated in the boiler room is first used to preheat the first heat exchange part, and then the first heat exchange part is used to exchange heat with the mixed protective gas and water vapor, and the mixed protective gas and water vapor are first heated in one section, so that the heat in the boiler room can be recycled and utilized, and the energy utilization rate is improved compared to directly using the first electric heater to heat to the electrolysis temperature.

[0033] In the above technical solution, the solid oxide electrolysis hydrogen production device also includes: a second heat exchange part, connected to the first output end, used to perform a first-stage cooling of the hydrogen generated during the electrolysis process; a first cooler, connected to the second heat exchange part, used to perform a second-stage cooling of the hydrogen after the first-stage cooling.

[0034] In this technical solution, the generated hydrogen is cooled by the second heat exchange part and the first cooler, so that the hydrogen can be recycled and the energy utilization rate can be improved.

[0035] In the above technical solution, the first heat exchange part and the second heat exchange part are on the same heat exchanger.

[0036] In this technical solution, the first heat exchange part and the second heat exchange part are on the same heat exchanger, for example, both are arranged on the second heat exchanger. It can be understood that the second heat exchanger includes a first cold end and a first hot end. The first hot end is used as a first heat exchange part to preheat water vapor, and the first cold end is used as a second heat exchange part to cool hydrogen. The first heat exchange part and the second heat exchange part are arranged on the same heat exchanger, so that the number of heat exchangers can be reduced and the overall complexity of the device can be reduced.

[0037] In the above technical solution, the solid oxide electrolysis hydrogen production device also includes: a gas delivery component connected to the second input end and used to deliver air to the electrolysis device; a gas recovery component connected to the second output end and used to recover the oxygen-rich gas produced by electrolysis.

[0038] In the above technical solution, the gas delivery component includes: a fan, including an air supply port, for delivering air; a third heat exchange part, connected to the air supply port of the fan, for performing a first-stage heating of the air delivered from the air supply port; a fourth heat exchange part, connected to the third heat exchange part, for performing a second-stage heating of the air after the first-stage heating; a second electric heater, connected to the fourth heat exchange part and the second input end, for performing a third-stage heating of the air after the second-stage heating.

[0039] In this technical solution, the air delivered from the air outlet is heated in sections, which can improve the utilization rate of energy.

[0040] In the above technical solution, the gas recovery assembly includes: a return air fan, connected to the second output end, including a return air inlet for recovering the oxygen-rich gas generated by electrolysis; a fifth heat exchange part, connected to the return air inlet, for performing a first-stage cooling on the oxygen-rich gas recovered by the return air inlet; and a sixth heat exchange part, connected to the fifth heat exchange part, for performing a second-stage cooling on the oxygen-rich gas after the first-stage cooling.

[0041] In this technical solution, the recovered high-temperature oxygen-rich gas is first cooled in the fifth heat exchange part in the first stage and then cooled in the sixth heat exchange part in the second stage, so that the oxygen-rich air can be cooled to the storage temperature for storage for later use.

[0042] In the above technical solution, the temperature after the first-stage cooling is greater than or equal to 500 °C and less than or equal to 550 °C; the temperature after the second-stage cooling is greater than or equal to 50 °C and less than or equal to 100 °C.

[0043] In the above technical solution, the gas recovery assembly further includes a regenerator, which can be arranged between the fifth heat exchange part and the return air inlet.

[0044] In this technical solution, in order to realize the recovery and utilization of energy, a regenerator can be arranged between the fifth heat exchange part and the return air inlet, so that the heat can be recovered by the regenerator before the high-temperature oxygen-rich gas is cooled. This not only improves the energy utilization rate but also improves the later cooling effect.

[0045] In the above technical solution, the fourth heat exchange part and the fifth heat exchange part are on the same heat exchanger.

[0046] In this technical solution, the fourth heat exchange part and the fifth heat exchange part are on the same heat exchanger. For example, they are both arranged on the third heat exchanger. It can be understood that the third heat exchanger includes a second cold end and a second hot end. The second hot end is used as the fourth heat exchange part to preheat the air, and the second cold end is used as the fifth heat exchange part to cool the oxygen-rich air. Arranging the fourth heat exchange part and the fifth heat exchange part on the same heat exchanger can reduce the number of heat exchangers and lower the overall complexity of the device.

[0047] In the above technical solution, the third heat exchange part and the sixth heat exchange part are arranged on the same heat exchanger.

[0048] In this technical solution, the third heat exchange part and the sixth heat exchange part are on the same heat exchanger. For example, they are both arranged on the fourth heat exchanger. It can be understood that the fourth heat exchanger includes a third cold end and a third hot end. The third hot end serves as the third heat exchange part for preheating air, and the third cold end serves as the sixth heat exchange part for cooling oxygen-rich air. Arranging the third heat exchange part and the sixth heat exchange part on the same heat exchanger can reduce the number of heat exchangers and lower the overall complexity of the device.

[0049] In the above technical solution, the electrolysis device is a solid oxide electrolysis device. Brief Description of the Drawings

[0050] The drawings herein are incorporated into the specification and form a part of this specification, showing embodiments in accordance with the present invention and, together with the specification, are used to explain the principles of the present invention.

[0051] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0052] Figure 1 It is a schematic structural diagram of a solid oxide electrolysis hydrogen production device provided by an embodiment of the present invention;

[0053] Figure 2 It is another schematic structural diagram of a solid oxide electrolysis hydrogen production device provided by an embodiment of the present invention;

[0054] Figure 3 It is a schematic structural diagram of a heat exchange tube of a solid oxide electrolysis hydrogen production device provided by an embodiment of the present invention.

[0055] Among them, Figures 1 to 3 The corresponding relationship between the reference numerals and the component names in the drawings is as follows:

[0056] 1 First heat exchanger, 102 Water injection port, 104 Preheating medium inlet, 106 Preheating medium outlet, 2 Steam generator, 3 Gas mixing device, 4 Second heat exchanger, 5 First electric heater, 6 Electrolysis device, 7 First cooler, 8 Third heat exchanger, 9 Fourth heat exchanger, 10 Second electric heater, 11 Geothermal collector, 112 Inner tube, 114 Outer tube, 12 Circulation pump, 13 Heat source. Detailed Embodiments

[0057] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

[0058] As Figure 1 shown, the solid oxide electrolytic hydrogen production device provided by the present invention includes a first heat exchanger 1. The first heat exchanger 1 includes a first flow path and a second flow path. The first flow path includes a water injection port 102 and a water outlet. The second flow path includes a preheating medium inlet 104 and a preheating medium outlet 106. Heat exchange can occur between the first flow path and the second flow path for preheating the water flowing through the first flow path. A steam generator 2 is connected to the water outlet for vaporizing the preheated water into steam. An electrolysis device 6 is connected to the steam generator 2, and the steam flowing out of the steam generator 2 can undergo an electrolysis reaction on the electrolysis device 6 to generate hydrogen.

[0059] The solid oxide electrolytic hydrogen production device provided by the present invention includes a first heat exchanger 1, a steam generator 2, and an electrolysis device 6. The first heat exchanger 1 includes a first flow path and a second flow path. The first flow path includes a water injection port 102 and a water outlet. The second flow path includes a preheating medium inlet 104 and a preheating medium outlet 106. Heat exchange can occur between the first flow path and the second flow path. The steam generator 2 is connected to the water outlet for vaporizing the preheated water into steam. The electrolysis device 6 is connected to the steam generator 2, and steam can undergo an electrolysis reaction on the electrolysis device 6. In this application, a first heat exchanger 1 is provided before the steam generator 2, and then high-temperature preheating medium is used to preheat the water, so that the water can be preheated in advance before generating hydrogen and steam, thereby improving the steam generation rate and the subsequent electrolytic hydrogen production efficiency.

[0060] In the above embodiment, the associated gas at the first preset temperature is introduced into the second flow path through the preheating medium inlet 104, and the first preset temperature is greater than or equal to 80 °C.

[0061] In this embodiment, the high-temperature associated gas can be introduced into the second flow path through the preheating medium inlet 104 to preheat the water in the first flow path, so that the energy in the associated gas can be recovered and utilized, saving energy. It can be understood that, usually, during the collection of associated gas, the high-temperature associated gas needs to be cooled to room temperature and then stored, which results in the waste of the heat in the high-temperature associated gas. However, in this application, the associated gas is used to preheat the water, which can improve the production efficiency of water vapor, realize the rational utilization of energy, and at the same time, the associated gas can be cooled and stored. Further, the first preset temperature is greater than or equal to 80 °C, and further, the first preset temperature is greater than or equal to 100 °C and less than or equal to 120 °C.

[0062] In the above embodiment, the solid oxide electrolytic hydrogen production device further includes an associated gas storage tank, which is connected to the preheating medium inlet 104 and is used to introduce the stored associated gas at the first preset temperature into the second flow path through the preheating medium inlet 104.

[0063] In this embodiment, by further setting the associated gas storage tank, on-site electrolytic hydrogen production is not required, and the high-temperature associated gas can be pre-stored in the associated gas storage tank in advance, improving the electrolysis efficiency.

[0064] As Figure 2 shown, in the above embodiment, the solid oxide electrolytic hydrogen production device further includes a geothermal collector, one end of which is communicated with the preheating medium inlet 104, and the other end is communicated with the preheating medium outlet 106. The geothermal collector collects geothermal energy to heat the preheating medium in the geothermal collector by using the geothermal energy. The heated preheating medium is introduced into the second flow path through the preheating medium inlet 104 and flows back to the geothermal collector through the preheating medium outlet 106.

[0065] In this embodiment, by setting the geothermal collector to preheat the water during the electrolysis process, on the one hand, the geothermal energy of the oilfield is fully utilized, avoiding the waste of the geothermal energy of the oilfield. On the other hand, using the geothermal energy of the oilfield to preheat the water can meet the demand for electrolytic water hydrogen production, so that there is no need to additionally set up a heating device, which not only saves costs but also avoids energy waste.

[0066] In the above embodiment, the geothermal collector includes a heat exchange tube, one end of the heat exchange tube is communicated with the preheating medium inlet 104, the other end is communicated with the preheating medium outlet 106, and the preheating medium is arranged inside the heat exchange tube.

[0067] In this embodiment, using the heat exchange tube as the geothermal collector can simplify the structure of the geothermal collector and reduce the production cost.

[0068] In the above embodiment, the preheating medium is preheated oil.

[0069] In this embodiment, since the specific heat capacity of the oil is relatively large, preheated oil is used as the preheating medium, which can improve the heat exchange efficiency.

[0070] In the above embodiment, as Figure 3 shown, the heat exchange tube includes an inner tube 112 and an outer tube 114. One end of the inner tube 112 is provided with a liquid outlet, and the other end is provided with a communication port. The liquid outlet is communicated with the preheating medium inlet 104. One end of the communication port of the inner tube 112 extends into the outer tube 114. The outer tube 114 includes a liquid return port, and the liquid return port is communicated with the preheating medium outlet 106. The outer surface of the outer tube 114 is in contact with the heat source 13.

[0071] In this embodiment, the heat exchange tube adopts the design of the outer tube 114 sleeving the inner tube 112, which can increase the contact area between the heat exchange tube and the heat source 13, thereby improving the heat exchange efficiency.

[0072] In the above embodiment, the solid oxide electrolytic hydrogen production device further includes a circulator, which is arranged between the geothermal collector and the preheating medium inlet 104, and is used to introduce the heated preheating medium into the second flow path through the preheating medium inlet 104.

[0073] In this embodiment, setting the circulator can ensure that the preheating medium can circulate, ensuring the heat exchange efficiency.

[0074] In the above embodiment, the circulator is a circulation pump 12.

[0075] In the above embodiment, the first heat exchanger 1 is one of a shell-and-tube heat exchanger, a tubular heat exchanger, a plate heat exchanger, and a fin heat exchanger. The surface area of this type of heat exchanger is relatively large, which can improve the heat exchange efficiency.

[0076] In the above embodiment, the solid oxide electrolytic hydrogen production device further includes a heating component, which is arranged between the steam generator 2 and the electrolysis device 6, and is used to heat the steam flowing out of the steam generator 2 and introduce the heated steam into the electrolysis device 6 to carry out an electrolysis reaction.

[0077] In this embodiment, the heating component can heat the steam flowing out of the steam generator 2 to the electrolysis temperature, and the heated steam can carry out an electrolysis reaction on the electrolysis device 6.

[0078] In the above embodiment, the solid oxide electrolytic hydrogen production device further includes: a gas mixing device 3, which is arranged between the steam generator 2 and the heating component; a protective gas generating device, which is connected to the gas mixing device 3 and can generate a protective gas; wherein, the protective gas generated by the protective gas generating device and the steam generated by the steam generator 2 can be mixed in the gas mixing device 3 and flow into the heating component together.

[0079] In this embodiment, the solid oxide electrolysis hydrogen production device further includes a gas mixing device 3 and a protective gas generation device. The gas mixing device 3 is arranged between the steam generator 2 and the heating assembly. The protective gas generation device is connected to the gas mixing device 3 and can generate protective gas. In this way, the protective gas generated by the protective gas generation device and the steam generated by the steam generator 2 can be mixed in the gas mixing device 3 and flow into the heating assembly together. In this way, the protective gas can prevent the cathode of the electrolysis device 6 from being oxidized, that is, prevent the nickel metal from being oxidized, and ensure the smooth progress of the electrolysis reaction. It can be understood that in this application, nickel metal is used as the electrolysis cathode, and by setting the electrolysis environment of the protective gas, the nickel metal can be prevented from being oxidized.

[0080] In the above embodiment, the protective gas generation device is one of a hydrogen generation device, a nitrogen generation device, and a helium generation device.

[0081] In the above embodiment, the electrolysis device 6 includes: a first input end, which is communicated with the heating assembly, and the heated steam and protective gas can enter the electrolysis device 6 through the first input end; a second input end, which is communicated with the outside air, and the outside air can enter the electrolysis device 6 through the second input end; a first output end, which is used to output the hydrogen generated by electrolysis; and a second output end, which is used to output the oxygen-rich gas generated by electrolysis.

[0082] In this embodiment, the electrolytic water device includes a first input end, a second input end, a first output end, and a second output end. The first input end is communicated with the heating assembly and can transport the heated steam to the electrolytic water device for electrolysis based on the steam. The second input end is communicated with the outside air and can allow the outside air to enter the electrolysis device 6 to meet the electrolysis requirements. The first output end can output the hydrogen generated by electrolysis, and the second output end can discharge the oxygen-rich air generated by electrolysis. Among them, introducing air through the second input end can also carry out the oxygen generated by electrolysis, maintain the performance of the electrolytic water device, and keep the pressure difference balance on both sides of the electrolytic water device.

[0083] In the above embodiment, the heating assembly includes: a first heat exchange part, which is connected to the gas mixing device 3 and is used for performing a first-stage heating on the mixed protective gas and steam; a first electric heater 5, which is connected to the first heat exchange part and the first input end and is used for performing a second-stage heating on the protective gas and steam after the first-stage heating.

[0084] In this embodiment, through segmented heating, the waste heat of the high-temperature gas is first fully utilized by the first heat exchange part to preheat the mixed protective gas and water vapor, and then the first electric heater 5 is used to heat the mixed protective gas and water vapor to the electrolysis temperature, which can improve the energy utilization efficiency of the system. It can be understood that, for example, the heat generated in the boiler room first preheats the first heat exchange part, and then the first heat exchange part exchanges heat with the mixed protective gas and water vapor to perform a first-stage heating on the mixed protective gas and water vapor, so that the heat recovery in the boiler room can be realized. Compared with directly heating to the electrolysis temperature by the first electric heater 5, the energy utilization rate is improved.

[0085] In the above embodiment, the solid oxide electrolysis hydrogen production device further includes: a second heat exchange part connected to the first output end for performing a first-stage cooling on the hydrogen generated during the electrolysis process; a first cooler 7 connected to the second heat exchange part for performing a second-stage cooling on the hydrogen after the first-stage cooling.

[0086] In this embodiment, the generated hydrogen is cooled by the second heat exchange part and the first cooler 7, which can realize the recycling of hydrogen and improve the energy utilization rate.

[0087] In the above embodiment, the first heat exchange part and the second heat exchange part are on the same heat exchanger.

[0088] In this embodiment, the first heat exchange part and the second heat exchange part are on the same heat exchanger. For example, they are both arranged on the second heat exchanger 4. It can be understood that the second heat exchanger 4 includes a first cold end and a first hot end. The first hot end serves as the first heat exchange part for preheating the water vapor, and the first cold end serves as the second heat exchange part for cooling the hydrogen. By arranging the first heat exchange part and the second heat exchange part on the same heat exchanger, the number of heat exchangers can be reduced, and the overall complexity of the device can be lowered.

[0089] In the above embodiment, the solid oxide electrolysis hydrogen production device further includes: a gas delivery component connected to the second input end for delivering air to the electrolysis device 6; a gas recovery component connected to the second output end for recovering the oxygen-rich gas generated by the electrolysis.

[0090] In the above embodiment, the gas delivery component includes: a fan including an air outlet for delivering air; a third heat exchange part connected to the air outlet of the fan for performing a first-stage heating on the air sent out from the air outlet; a fourth heat exchange part connected to the third heat exchange part for performing a second-stage heating on the air after the first-stage heating; a second electric heater 10 connected to the fourth heat exchange part and the second input end for performing a third-stage heating on the air after the second-stage heating.

[0091] In this embodiment, the air sent out from the air supply outlet is heated in sections, which can improve the utilization rate of energy.

[0092] In the above embodiment, the gas recovery assembly includes: a return air fan, connected to the second output end, including a return air inlet for recovering the oxygen-rich gas generated by electrolysis; a fifth heat exchange part, connected to the return air inlet, for performing a first-stage cooling on the oxygen-rich gas recovered from the return air inlet; a sixth heat exchange part, connected to the fifth heat exchange part, for performing a second-stage cooling on the oxygen-rich gas after the first-stage cooling.

[0093] In this embodiment, the recovered high-temperature oxygen-rich gas is first cooled in the fifth heat exchange part in the first stage and then cooled in the sixth heat exchange part in the second stage, so that the oxygen-rich air can be reduced to the storage temperature for storage for later use.

[0094] In the above embodiment, the temperature after the first-stage cooling is greater than or equal to 500 °C and less than or equal to 550 °C; the temperature after the second-stage cooling is greater than or equal to 50 °C and less than or equal to 100 °C.

[0095] In the above embodiment, the gas recovery assembly further includes a heat accumulator, and the heat accumulator can be arranged between the fifth heat exchange part and the return air inlet.

[0096] In this embodiment, in order to realize the recovery and utilization of energy, a heat accumulator can be arranged between the fifth heat exchange part and the return air inlet, so that the heat can be recovered by the heat accumulator before the high-temperature oxygen-rich gas is cooled. This not only improves the utilization rate of energy but also improves the subsequent cooling effect.

[0097] In the above embodiment, the fourth heat exchange part and the fifth heat exchange part are on the same heat exchanger.

[0098] In this embodiment, the fourth heat exchange part and the fifth heat exchange part are on the same heat exchanger. For example, they are both arranged on the third heat exchanger 8. It can be understood that the third heat exchanger 8 includes a second cold end and a second hot end. The second hot end is used as the fourth heat exchange part to preheat the air, and the second cold end is used as the fifth heat exchange part to cool the oxygen-rich air. Arranging the fourth heat exchange part and the fifth heat exchange part on the same heat exchanger can reduce the number of heat exchangers and lower the overall complexity of the device.

[0099] In the above embodiment, the third heat exchange part and the sixth heat exchange part are arranged on the same heat exchanger.

[0100] In this embodiment, the third heat exchange part and the sixth heat exchange part are on the same heat exchanger. For example, they are both arranged on the fourth heat exchanger 9. It can be understood that the fourth heat exchanger 9 includes a third cold end and a third hot end. The third hot end serves as the third heat exchange part for preheating air, and the third cold end serves as the sixth heat exchange part for cooling the oxygen-rich air. Arranging the third heat exchange part and the sixth heat exchange part on the same heat exchanger can reduce the number of heat exchangers and lower the overall complexity of the device.

[0101] In the above embodiment, the electrolysis device 6 is a solid oxide electrolysis device 6.

[0102] The working process of the solid oxide electrolysis hydrogen production device provided by the embodiment of the present invention is as follows:

[0103] High-temperature associated gas circulation process: The temperature of the high-temperature associated gas is 100°C to 120°C. The associated gas is introduced into the first heat exchanger 1 to preheat pure water and then supplied to other systems.

[0104] Gas flow on the raw material gas side: Pure water is preheated to 80°C to 90°C in the first heat exchanger 1 and then enters the steam generator 2 for gasification to produce steam at 200°C to 210°C, which then enters the gas mixing device 3. Protective hydrogen enters the gas mixing device 3. The gases are mixed evenly in the gas mixing device 3. The mixed gas is heated to 550°C to 600°C through the second heat exchanger 4 and flows to the first electric heater 5 to be heated to 700°C to 750°C. H2O enters the SOEC stack (i.e., the electrolysis device 6) for reaction to produce H2. The high-temperature gas is cooled to 200°C to 250°C through the second heat exchanger 4 and further cooled to 50°C to 60°C in the first cooler 7 to remove H2O in the tail gas and then supplied for external use.

[0105] Further, the electrolysis reaction occurring on the cathode side is as follows

[0106] H2O + 2e- → H2 + O2-;

[0107] The O2- generated by electrolysis is transferred from the cathode to the anode through the electrolyte. On the anode side, 2 mol of O2 releases 4 mol of electrons, and the reaction is as follows:

[0108] 2O2- - 4e- → O2. Air side gas flow: Normal temperature air is heated to 250°C to 300°C through the third heat exchanger 8, flows through the fourth heat exchanger 9 to be heated to 550°C to 600°C, enters the second electric heater 10 to be heated to 700°C to 750°C, and the hot air enters the 7SOEC stack (i.e., the electrolysis device 6). The high-temperature oxygen-rich air is heated to 500°C to 550°C through the fourth heat exchanger 9 and flows to the third heat exchanger 8 to be cooled to 50°C to 100°C and then discharged. Among them, the electrolysis efficiency of the SOEC electrolysis system is 90% to 95%, and the system efficiency is 70% to 75%.

[0109] Although this specification contains many specific implementation details, these should not be construed as limiting the scope of any invention or the scope of what is claimed, but rather are primarily used to describe the features of specific embodiments of a particular invention. Certain features that are described in multiple embodiments in this specification may also be implemented in combination in a single embodiment. On the other hand, the various features described in a single embodiment may also be implemented separately in multiple embodiments or in any suitable sub-combination. Additionally, although features may operate in certain combinations as described above and even be claimed as such initially, one or more features from a claimed combination may in some cases be removed from that combination, and the claimed combination may be directed to a sub-combination or a variation of a sub-combination.

[0110] Similarly, although operations are depicted in the drawings in a particular order, this should not be construed as requiring that those operations be performed in the particular order shown or sequentially, or that all illustrated operations be performed, to achieve the desired result. In some cases, multitasking and parallel processing may be advantageous. Additionally, the separation of various system modules and components in the above embodiments should not be construed as requiring such separation in all embodiments, and it should be understood that the described program components and systems can generally be integrated together in a single software product or packaged into multiple software products.

[0111] Accordingly, specific embodiments of the subject matter have been described. Other embodiments are within the scope of the appended claims. In some cases, the acts recited in the claims may be performed in a different order and still achieve the desired result. Additionally, the processes depicted in the drawings are not necessarily in the particular order or sequential order shown to achieve the desired result. In some implementations, multitasking and parallel processing may be advantageous.

[0112] It should be noted that, in this document, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements that are inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0113] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A solid oxide electrolysis hydrogen production device, characterized in that Comprising: A first heat exchanger (1), including a first flow path and a second flow path. The first flow path includes a water injection port (102) and a water outlet, and the second flow path includes a preheating medium inlet (104) and a preheating medium outlet (106). Heat exchange can occur between the first flow path and the second flow path, and is used to preheat the water flowing through the first flow path. A steam generator (2), connected to the water outlet, and is used to vaporize the preheated water into steam. An electrolysis device (6), connected to the steam generator (2). The steam flowing out of the steam generator (2) can undergo an electrolysis reaction on the electrolysis device (6) to generate hydrogen.

2. The solid oxide electrolysis hydrogen production device according to claim 1, wherein The associated gas at a first preset temperature is introduced into the second flow path through the preheating medium inlet (104), and the first preset temperature is greater than or equal to 80 °C.

3. The solid oxide electrolysis hydrogen production device according to claim 2, wherein The first preset temperature is greater than or equal to 100 °C and less than or equal to 120 °C.

4. The solid oxide electrolysis hydrogen production device according to claim 2, characterized in that, Further comprising: An associated gas storage tank, connected to the preheating medium inlet (104), and is used to introduce the stored associated gas at the first preset temperature into the second flow path through the preheating medium inlet (104).

5. The solid oxide electrolysis hydrogen production device according to claim 1, characterized in that, Further comprising: A geothermal collector (11), one end of which is connected to the preheating medium inlet (104), and the other end is connected to the preheating medium outlet (106). The geothermal collector (11) collects geothermal energy to heat the preheating medium in the geothermal collector (11) using geothermal energy. The heated preheating medium is introduced into the second flow path through the preheating medium inlet (104), and flows back to the geothermal collector (11) through the preheating medium outlet (106).

6. The solid oxide electrolysis hydrogen production device according to claim 5, characterized in that, The geothermal collector (11) includes a heat exchange tube. One end of the heat exchange tube is connected to the preheating medium inlet (104), and the other end is connected to the preheating medium outlet (106). The preheating medium is arranged inside the heat exchange tube.

7. The solid oxide electrolysis hydrogen production device according to claim 5, characterized in that, The preheating medium is preheated oil.

8. The solid oxide electrolysis hydrogen production device according to claim 6, characterized in that The heat exchange tube includes an inner tube (112) and an outer tube (114). One end of the inner tube (112) is provided with a liquid outlet, and the other end is provided with a communication port. The liquid outlet is connected to the preheating medium inlet (104). One end of the communication port of the inner tube (112) extends into the outer tube (114). The outer tube (114) includes a liquid return port, and the liquid return port is connected to the preheating medium outlet (106). The outer surface of the outer tube (114) is in contact with a heat source (13).

9. The solid oxide electrolysis hydrogen production device according to claim 5, characterized in that, Further comprising: A circulator, arranged between the geothermal collector (11) and the preheating medium inlet, and is used to introduce the heated preheating medium into the second flow path through the preheating medium inlet (104).

10. The solid oxide electrolysis hydrogen production device according to claim 9, wherein The circulator is a circulation pump (12).

11. The solid oxide electrolysis hydrogen production device according to claim 1, wherein, The first heat exchanger (1) is one of a shell-and-tube heat exchanger, a tubular heat exchanger, a plate heat exchanger, and a fin heat exchanger.

12. The solid oxide electrolysis hydrogen production device according to claim 1, wherein Further comprising: A heating component is arranged between the water vapor generator (2) and the electrolysis device (6), and is used to heat the water vapor flowing out of the water vapor generator (2), and pass the heated water vapor into the electrolysis device (6) to generate an electrolysis reaction.

13. The solid oxide electrolysis hydrogen production device according to claim 12, characterized in that, Also includes: A gas mixing device (3) is arranged between the water vapor generator (2) and the heating component; A protective gas generating device, connected to the gas mixing device (3) and capable of generating protective gas; The protective gas generated by the protective gas generating device and the water vapor generated by the water vapor generator (2) can be mixed in the gas mixing device (3) and flow into the heating component together.

14. The solid oxide electrolysis hydrogen production device according to claim 13, characterized in that: The protective gas generator is one of a hydrogen generator, a nitrogen generator and a helium generator.

15. The solid oxide electrolysis hydrogen production device according to claim 13, characterized in that, The electrolysis device (6) comprises: a first input end, connected to the heating component, through which the heated water vapor and protective gas can enter the electrolysis device (6); a second input end, connected to the outside air, and the outside air can enter the electrolysis device (6) through the second input end; A first output terminal, used for outputting hydrogen generated by electrolysis; The second output terminal is used to output the oxygen-rich gas generated by electrolysis.

16. The solid oxide electrolysis hydrogen production device according to claim 15, characterized in that, The heating assembly comprises: A first heat exchange part, connected to the gas mixing device (3), for heating the mixed protective gas and water vapor; A first electric heater (5) is connected to the first heat exchange part and the first input end, and is used for performing second-stage heating on the protective gas and water vapor after the first-stage heating.

17. The solid oxide electrolysis hydrogen production device according to claim 15, characterized in that, Also includes: A second heat exchange part, connected to the first output end, for cooling the hydrogen generated during the electrolysis process; The first cooler (7) is connected to the second heat exchange part and is used to perform a second stage of cooling on the hydrogen after the first stage of cooling.

18. The solid oxide electrolysis hydrogen production device according to claim 15, characterized in that, Also includes: a gas delivery component connected to the second input end and used for delivering air to the electrolysis device (6); A gas recovery component is connected to the second output end and is used to recover the oxygen-rich gas generated by electrolysis.

19. The solid oxide electrolysis hydrogen production device according to claim 18, characterized in that, The gas delivery assembly comprises: A fan, including an air supply port, for conveying air; A third heat exchange part, connected to the air outlet of the fan, for heating the air delivered from the air outlet; a fourth heat exchange part, connected to the third heat exchange part, and used for performing second-stage heating on the air after the first-stage heating; The second electric heater (10) is connected to the fourth heat exchange part and the second input end, and is used for performing three-stage heating on the air after the two-stage heating.

20. The solid oxide electrolysis hydrogen production device according to claim 18, wherein, The gas recovery assembly comprises: a return air fan connected to the second output end, comprising a return air port, wherein the return air port is used to recover the oxygen-rich gas generated by electrolysis; a fifth heat exchange part, connected to the return air port, for cooling the oxygen-rich gas recovered from the return air port; The sixth heat exchange part is connected to the fifth heat exchange part, and is used for performing a second stage of cooling on the oxygen-rich gas after the first stage of cooling.

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