Solid oxide electrolytic cell system and starting method

Abstract

The solid oxide electrolytic cell system comprises an electrolytic cell, an anode inlet of the electrolytic cell is connected with an air supply mechanism through an anode side pipeline, a cathode inlet of the electrolytic cell is connected with a steam source through a cathode side pipeline, and a first heater is arranged on the anode side pipeline. A steam flow adjusting assembly and a second heater are arranged on the cathode side pipeline, the cathode side pipeline between the steam flow adjusting assembly and the second heater is connected with one end of an air pipeline, the other end of the air pipeline is connected to an air supply mechanism, and an air pipeline valve is arranged on the air pipeline. And the condensation phenomenon of water vapor on a hot part on the cathode side of the electrolytic cell is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of solid oxide electrolysis, in particular to a solid oxide electrolysis cell system and a starting method. BACKGROUND

[0002] The statements herein are provided only to enhance understanding of the present application and are not necessarily intended to constitute the prior art.

[0003] Solid oxide electrolysis is a device for converting water vapor into hydrogen by external electric energy at high temperature. The oxidation reaction of oxygen occurs on the anode side, and the anode side pipeline supplies air. The reduction reaction of steam occurs on the cathode side of the electrolysis cell, and the pipeline supplies steam. Its suitable operating temperature is 500-900℃. Due to its high-temperature operation characteristics, the system device needs to be heated to the operating temperature in advance. At present, the heating and temperature rising is only performed on the anode side before the starting of the existing solid oxide electrolysis cell system, and the temperature rising rate is slow, thereby facing the problem of long starting time. In addition, if the heat components on the cathode side in the system are not fully heated during the starting stage, condensation of water vapor in the heat components on the cathode side may occur during the purging. SUMMARY

[0004] In view of the deficiencies in the prior art, the purpose of the present application is to provide a solid oxide electrolysis cell system and a starting method, which avoids the condensation of water vapor in the heat components on the cathode side during the purging process on the cathode side.

[0005] In order to achieve the above-mentioned purpose, the present application is realized by the following technical scheme: In a first aspect, the embodiments of the present application provide a solid oxide electrolysis cell system, comprising an electrolysis cell, an air supply mechanism connected to the electrolysis cell anode inlet through an anode side pipeline, a steam source connected to the electrolysis cell cathode inlet through a cathode side pipeline, a first heater arranged on the anode side pipeline, a steam flow adjusting assembly and a second heater arranged on the cathode side pipeline, the cathode side pipeline between the steam flow adjusting assembly and the second heater being connected to one end of an air pipeline, the other end of the air pipeline being connected to the air supply mechanism and the air pipeline being provided with an air pipeline valve. Before the cathode side pipeline is connected to water vapor, the second heater can heat the air in the anode side pipeline connected by the air pipeline to preheat the cathode side of the electrolysis cell.

[0006] Optionally, along the flow direction of the air, the anode side pipeline upstream of the first heater is provided with a first heat exchanger, the cold side flow channel of the first heat exchanger is connected to the anode side pipeline, and the inlet of the hot side flow channel of the first heat exchanger is connected to the anode outlet of the electrolysis cell.

[0007] Optionally, a second heat exchanger is provided between the connection point of the air duct and the cathode-side pipeline and the second heater. The cold-side flow channel of the second heat exchanger is connected to the cathode-side pipeline, and the inlet of the hot-side flow channel is connected to the cathode outlet of the electrolytic cell.

[0008] Optionally, a temperature sensor is installed on the pipeline between the second heater and the second heat exchanger.

[0009] Optionally, a temperature sensor and an oxygen sensor are installed on the pipeline between the cathode outlet of the electrolytic cell and the inlet of the hot side flow channel of the second heat exchanger.

[0010] Optionally, the air duct is connected to a mixer installed on the cathode side duct, the mixer is connected to a steam flow regulating component, and the mixer is also connected to a hydrogen supply system.

[0011] Optionally, the hydrogen supply system includes a hydrogen supply pipeline, with its inlet end connected to a hydrogen source and its outlet end connected to a mixer. Along the flow direction of the hydrogen, a pressure reducing valve, a hydrogen pipeline on / off valve, and a hydrogen flow controller are sequentially installed on the hydrogen supply pipeline.

[0012] Optionally, the air supply mechanism uses a fan, the outlet of which is connected to the anode side pipeline and the inlet of the air duct. The anode side pipeline is equipped with an anode switch valve, and the air duct is equipped with an air duct valve. or; The air supply mechanism uses a first fan and a second fan. The first fan is connected to the anode side pipeline, and the second fan is connected to the air duct. The air duct is equipped with an air duct valve.

[0013] Optionally, the steam flow channel regulating assembly includes a regulating valve, and a flow meter is provided upstream of the regulating valve along the steam flow direction.

[0014] Secondly, embodiments of the present invention provide a startup method for the solid oxide electrolytic cell system described in the first aspect: The air supply mechanism and the first heater are started to heat the anode side of the electrolytic cell. Before steam enters the cathode side pipeline, the air pipe valve on the air pipe is opened, and the second heater is turned on. Air enters the cathode side pipeline and is heated by the second heater to heat the cathode side of the electrolytic cell. After the cathode side of the electrolytic cell is heated, the air pipe valve is closed, and steam is introduced into the cathode side pipeline through the steam flow regulating component to purge the cathode side pipeline and the cathode side of the electrolytic cell with steam. When the cathode outlet temperature of the electrolytic cell reaches the set temperature, the startup process is completed. The beneficial effects of this invention are as follows: 1. The solid oxide electrolysis cell system and starting method of the present application is provided with an air pipeline and a second heater, before the cathode side pipeline is connected to the water vapor, the air can be introduced into the cathode side pipeline through the air pipeline, and the cathode side of the electrolysis cell is heated by the second heater, the air introduced into the anode side of the electrolysis cell is heated by the first heater, so that the anode side and the cathode side of the electrolysis cell are heated synchronously, the heating rate of the electrolysis cell is improved, and the starting time is shortened, at the same time, before the steam enters the cathode side pipeline, the air introduced into the cathode side of the electrolysis cell is preheated, avoiding the condensation of steam in each heat component of the cathode side of the electrolysis cell.

[0015] 2. The solid oxide electrolysis cell system and starting method of the present application is provided with a first heat exchanger and a second heat exchanger, through the first heat exchanger, the low-temperature air introduced into the anode side pipeline can be preheated by the high-temperature air discharged from the anode of the electrolysis cell, improving the utilization rate of heat, through the second heat exchanger, the low-temperature air introduced into the cathode side pipeline can be preheated by the high-temperature air discharged from the cathode of the electrolysis cell, on the one hand, the preheating efficiency of the cathode side pipeline is improved, preventing the condensation of water vapor in the cathode side pipeline after being introduced, on the other hand, the utilization rate of heat is also improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the description of the exemplary embodiments of the present application and the explanation thereof, explain the present application, and do not constitute an improper limitation of the present application.

[0017] Figure 1 is a schematic diagram of the fixed oxide electrolysis cell system architecture; Figure 2 is a schematic diagram of the overall structure of embodiment 1 of the present application; Figure 3 is a flow chart of the starting method of embodiment 2 of the present application; Figure 4 is a schematic diagram of the overall structure of embodiment 3 of the present application; Figure 5 is a flow chart of the starting method of embodiment 4 of the present application; Among them, 1. electrolysis cell, 2. fan, 3. first heat exchanger, 4. first heater, 5. first butterfly valve, 6. mixer, 7. second heat exchanger, 8. second heater, 9. flowmeter, 10. regulating valve, 11. first on-off valve, 12. second butterfly valve, 13. pressure reducing valve, 14. second on-off valve, 15. flow controller, 16. first temperature sensor, 17. second temperature sensor, 18. oxygen sensor, 19. first fan, 20. second fan. DETAILED DESCRIPTION In this embodiment, as shown in the schematic diagram of the fixed oxide electrolysis cell system architecture, Figure 1As shown, the electrolytic cell system architecture is a co-current mode, that is, the electrolytic cell cathode side BOP only occurs between the cathode side stream heat exchange, electrolytic cell anode side BOP only occurs between the anode side stream heat exchange, electrolytic cell anode side BOP and cathode side BOP can be used with existing equipment, electrolytic cell anode side occurs oxygen oxidation reaction, O 2 - →O2+ e - , the pipeline supply gas is air. The electrolytic cell cathode side occurs a reduction reaction of steam, H2O + e - →O 2- + H2, the pipeline supply gas is water vapor. The electrolytic cell system is suitable for operating temperature of 500-900℃.

[0018] Embodiment 1 The embodiment provides a solid oxide electrolytic cell system, as shown, comprising an electrolytic cell 1, the electrolytic cell 1 can be used with existing equipment, having an anode side and a cathode side, using existing equipment, its specific structure is not described in detail here. Figure 2

[0019] The anode side inlet of the electrolytic cell 1 is connected with the anode side pipeline, and the cathode side inlet of the electrolytic cell is connected with the cathode side pipeline.

[0020] One end of the anode side pipeline is connected with the anode side inlet of the electrolytic cell 1, and the other end is connected to an air supply mechanism.

[0021] In the embodiment, the air supply mechanism uses a fan 2, the outlet of the fan 2 is connected with the inlet of the anode side pipeline, and in the flow direction of the air, the anode side pipeline is sequentially provided with an anode side pipeline valve, a first heat exchanger 3 and a first heater 4.

[0022] The anode side pipeline valve uses a first butterfly valve 5, which is used for controlling the on and off of the anode side pipeline. It can be understood that the anode side pipeline valve can also use a ball valve or other valves capable of controlling the on and off of the pipeline, which can be selected by those skilled in the art according to actual needs.

[0023] The first heat exchanger 3 can be used with existing equipment, which has a cold side flow channel and a hot side flow channel, the cold side flow channel is used for passing into a low temperature medium, and the hot side flow channel is used for passing into a high temperature medium, so as to realize heat exchange, which can be used with existing equipment, and further technical details are not described in detail here, The cold side flow channel of the first heat exchanger 3 is connected into the anode side pipeline, that is, the inlet of the cold side flow channel of the first heat exchanger 4 is connected with the outlet of the first butterfly valve 5, and the outlet of the cold side flow channel of the first heat exchanger is connected with the inlet of the first heater 4.

[0024] ​The inlet of the hot side flow channel of the first heat exchanger 3 is connected with the anode side outlet of the electrolytic cell 1 through a pipeline, and the outlet of the hot side flow channel of the first heat exchanger 4 is connected with an air exhaust pipe for exhausting the air from the anode side outlet of the electrolytic cell into the external environment.

[0025] The first heater 4 is a conventional heating device for heating air, and the specific structure thereof is not described in detail herein. The inlet of the first heater 4 is connected with the outlet of the cold side flow channel of the first heat exchanger 3, and the outlet of the first heater 4 is connected with the anode side inlet of the electrolytic cell 1.

[0026] The cathode side inlet of the electrolytic cell 1 is connected with one end of a cathode side pipeline, and the other end of the cathode side pipeline is connected with a steam source for supplying water vapor into the cathode side pipeline. The steam source is a conventional device, and the specific structure thereof is not described in detail herein.

[0027] In the flow direction of the water vapor, the cathode side pipeline is sequentially provided with a steam flow adjusting assembly, a mixer 6, a second heat exchanger 7 and a second heater 8.

[0028] The steam flow adjusting assembly comprises a flow meter 9 and an adjusting valve 10 installed on the cathode side pipeline. The flow meter 9 is located downstream of the adjusting valve 10. The flow meter 9 is used for detecting the flow of the water vapor, and the adjusting valve 10 is used for adjusting the flow of the water vapor.

[0029] The second heat exchanger 7 is a conventional device having a cold side flow channel and a hot side flow channel. The cold side flow channel is connected with the cathode side pipeline, i.e., the inlet of the cold side flow channel is connected with the outlet of the mixer 6, and the outlet of the cold side flow channel is connected with the inlet of the second heater 8. The inlet of the hot side flow channel of the second heat exchanger 7 is connected with the cathode side outlet of the electrolytic cell 1 through a pipeline, and the outlet of the hot side flow channel of the second heat exchanger 7 is provided with a hydrogen exhaust pipe for exhausting the hydrogen generated by the electrolytic cell, which is collected and utilized after being treated downstream.

[0030] The second heater 8 is a conventional device, and the specific structure thereof is not described in detail herein. The second heater 8 is used for heating the air or water vapor supplied thereto. The inlet of the second heater 8 is connected with the outlet of the cold side flow channel of the second heat exchanger 7, and the outlet of the second heater 8 is connected with the cathode side inlet of the electrolytic cell 1.

[0031] The outlet of the fan 2 is also connected with one end of an air pipeline, and the other end of the air pipeline is connected with the mixer 6 to realize the connection between the air pipeline and the cathode side pipeline.

[0032] The air pipeline is provided with an air pipeline valve. In the embodiment, the air pipeline valve comprises a first switch valve 11 and a second butterfly valve 12 arranged in sequence in the flow direction of the air, for controlling the on and off of the air pipeline. In the embodiment, the second butterfly valve 12 has poor sealing performance, and therefore the first switch valve 11 is added. Preferably, the first switch valve 11 is an electromagnetic switch valve.

[0033] In the embodiment, the air passage can introduce the air into the cathode side pipeline after passing through the first switch valve 11, the second butterfly valve 12 and the mixer 6, and into the second heater 8 after passing through the cold side flow channel of the second heat exchanger 7. The second heater 8 heats the air, which enters the cathode side of the electrolytic cell 1 and the hot side flow channel of the second heat exchanger 7 in sequence as high-temperature gas, to realize preheating and temperature rising of the cathode side components of the electrolytic cell system. When the air preheats and raises the temperature of the cathode side components to the temperature of the thermocouple reaching C2 (for example, 150°C), it indicates that the temperature of each component is high enough to meet the condition of entering steam, and condensation of the steam does not occur. In this way, the next step of starting steam supply and purging can be performed. At the same time, the high-temperature hydrogen gas discharged from the electrolytic cell 1 can heat the air in the cathode side pipeline, improving the heat utilization rate and preheating and temperature rising of the cathode side pipeline.

[0034] The mixer 6 is also connected to a hydrogen supply system. The hydrogen supply system comprises a hydrogen supply pipeline, one end of which is connected to the mixer 6, and the other end is connected to a hydrogen source. The hydrogen source can be an existing device, which will not be described in detail here. In the embodiment, the hydrogen can be provided by a hydrogen storage tank downstream of hydrogen production, or other separate supply devices, which will not be described in detail here.

[0035] In the flow direction of the hydrogen, a pressure reducing valve 13, a second switch valve 14 and a flow controller 15 (MFC) are arranged in sequence on the hydrogen supply pipeline. The pressure reducing valve 13 is used to reduce the pressure of the hydrogen, the second switch valve 14 is used to control the on and off of the hydrogen supply pipeline, and the flow controller 15 is used to control the flow of the hydrogen. The flow controller 15 can be an existing device, which will not be described in detail here.

[0036] Preferably, the second switch valve 14 is an electromagnetic switch valve.

[0037] By providing the hydrogen supply system for providing reducing hydrogen, the reducing atmosphere condition of the cathode at high temperature can be ensured.

[0038] In this embodiment, a first temperature sensor 16 is installed on the anode side pipeline between the second heat exchanger 7 and the second heater 8 to detect the temperature T1 of the medium flowing out of the cold side channel of the second heat exchanger 7. A second temperature sensor 17 and an oxygen sensor 18 are installed on the pipeline between the cathode side outlet of the electrolytic cell 1 and the hot side channel inlet of the second heat exchanger 7. The second temperature sensor is used to detect the gas temperature of the exhaust gas from the cathode side outlet of the electrolytic cell, and the oxygen sensor is used to detect the oxygen concentration of the exhaust gas from the cathode side outlet of the electrolytic cell.

[0039] Example 2 This embodiment provides a startup method for the solid oxide electrolytic cell system described in Embodiment 1, such as... Figure 3 As shown, after the start command is triggered, the first butterfly valve 5 and the fan 2 are opened, and the first heater 4 is turned on at the same time. The control temperature of the first heater 4 is set to C1 (for example, 400℃). The temperature C1 can be set according to actual needs and will not be described in detail here. The first heater 4 heats the air introduced into the anode side pipeline, thereby raising the temperature of the anode side system of the electrolytic cell 1. The high-temperature air discharged from the anode side outlet of the electrolytic cell 1 enters the high-temperature flow channel of the first heat exchanger 3 to preheat the air introduced into the anode side pipeline, realizing the utilization of waste heat and improving the heat utilization rate. Simultaneously open the second butterfly valve 12 and the first switch valve 11, and open the second heater 8. The air delivered by the fan 2 enters the cathode side pipeline through the air pipe and mixer 6. The second heater 8 heats the air entering the cathode side pipeline. The high-temperature air enters the cathode side of the electrolytic cell 1 to preheat the cathode side system. The high-temperature air discharged from the cathode side outlet of the electrolytic cell 1 enters the hot side flow channel of the second heat exchanger 7 to preheat the air in the cathode side pipeline, realizing the utilization of waste heat and preheating the cathode side pipeline at the same time.

[0040] The second heater 8 is set to control temperature C1, and the temperature T1 monitored by the first temperature sensor 16 is monitored. When T1 does not reach the set temperature C2, the air supply in the air channel is maintained to continue to preheat the cathode side of the electrolytic cell 1. The set temperature C2 is 150°C. It is understood that those skilled in the art can set the specific value of the set temperature C2 according to actual needs.

[0041] When the first temperature sensor 16 detects that T1 has reached the set temperature C2, it indicates that the preheating process has been completed. The steam regulating component is adjusted to introduce water vapor into the cathode-side pipeline. At the same time, the first switch valve 11 and the second butterfly valve 12 on the air pipeline are closed. Water vapor enters the cathode-side pipeline and the cathode side of the electrolytic cell 1 to purge the air from the cathode-side pipeline and the cathode side of the electrolytic cell 1. The detection value of the oxygen sensor 18 is monitored. If the detected oxygen concentration value is not lower than the set concentration value C3, the water vapor purging is continued until the oxygen concentration value is lower than the set concentration value C3, thus completing the water vapor purging stage.

[0042] In the condition of keeping water vapor supply, the second switch valve 14 is opened, the cathode side pipeline is connected to hydrogen, and the cathode side of the electrolytic cell is completely in the mixed reducing condition of water vapor and hydrogen. At this time, the electrolytic cell 1 can continue to be heated, the temperature is controlled to C4 (for example, 700℃) by adjusting the first heater 4 and the second heater 8, the electrolytic cell system enters the hydrogen protection heating process, and the starting process is completed when the second temperature sensor 17 detects that the temperature reaches the set temperature C5 (for example, 700℃).

[0043] In the embodiment, the cathode side and the anode side of the electrolytic cell can be heated and controlled during the starting process of the system. Compared with the traditional electrolytic cell system in which only the anode side is heated and controlled, the starting time of the system can be effectively shortened.

[0044] Moreover, the cathode side of the electrolytic cell system has been heated by the second heater and air before the water vapor is blown to replace it, so that the condensation problem in the cathode side heat components during the water vapor blowing process can be avoided.

[0045] Embodiment 3 The embodiment provides a solid oxide electrolytic cell system, as shown in Figure 4 Compared with the embodiment 1, the difference is that two fans are arranged, namely a first fan 19 and a second fan 20, the first fan 19 is connected with the anode side pipeline, the second fan 20 is connected with the air pipeline, no first butterfly valve is arranged between the first fan and the first heat exchanger, only one first switch valve 11 is arranged on the air pipeline between the second fan 20 and the mixer 6, and the rest of the structure of the embodiment is the same as that of the embodiment 1, which will not be described in detail.

[0046] Embodiment 4 The embodiment provides a working method of the solid oxide electrolytic cell system in the embodiment 3, as shown in Figure 5As shown, after receiving the start instruction, the first air blower 19 is started to supply air, and the first heater 4 is started, the first heater 4 is set to control the temperature C1 (for example, 400℃), and the anode side system is heated. At the same time, the second air blower 20, the first switch valve 11, and the second heater 8 are started to provide preheated air for the cathode side of the electrolytic cell system, the heated air enters the cathode side of the electrolytic cell 1 to preheat and heat the cathode side system, and the second heater 8 is set to control the temperature to be C1. The first temperature sensor 16 detects the temperature value T1, if the set temperature value C2 (150℃) is not reached, the second air blower 20 and the air passage are kept to supply air, and the preheating and heating continue, if the set temperature value C2 is reached, it means that the preheating and heating process is completed, at this time, the steam flow adjusting assembly is controlled, the cathode side pipeline is supplied with water vapor, the second air blower 20 and the first switch valve 11 are closed at the same time, and the water vapor purging process is entered, which is responsible for blowing away the air in the cathode side pipeline and the electrolytic cell cathode side flow channel. If the oxygen sensor 18 detects that the oxygen concentration value is not lower than the set concentration value C3, the water vapor purging is kept, if the oxygen concentration value is lower than the set concentration value C3, the water vapor purging stage is completed. The second switch valve 14 is opened to supply hydrogen to the cathode side pipeline under the condition of keeping the water vapor supply, the cathode side of the electrolytic cell 1 is completely in the mixed reducing condition of water vapor and hydrogen, at this time, the electrolytic cell 1 can continue to be heated, the first heater 4 and the second heater 8 are adjusted to control the temperature to be C4 (for example, 700℃), the system enters the hydrogen protection heating process, and when the second temperature sensor 17 detects that the temperature T2 reaches C5 (for example, 700℃), the start process is completed.

[0047] The electrolytic cell system and the start method of the embodiment can realize heating and heating control of the anode and cathode sides of the electrolytic cell in the start process, can effectively reduce the start time of the system, and can realize heating and heating of the cathode side components and pipelines of the electrolytic cell system before water vapor purging, to avoid condensation in the hot components in the steam purging process.

[0048] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Those skilled in the art can make various changes and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A solid oxide electrolysis cell system comprising an electrolysis cell, an anode inlet of the electrolysis cell being connected to an air supply mechanism through an anode side pipe, a cathode inlet of the electrolysis cell being connected to a steam source through a cathode side pipe, a first heater being arranged on the anode side pipe, a steam flow adjusting assembly and a second heater being arranged on the cathode side pipe, the cathode side pipe between the steam flow adjusting assembly and the second heater being connected to one end of an air pipe, the other end of the air pipe being connected to the air supply mechanism and an air pipe valve being arranged on the air pipe; The second heater can heat the air in the anode side pipe from the air pipe to preheat the cathode side of the electrolysis cell before the cathode side pipe is connected to the water vapor.

2. A solid oxide electrolyser system according to claim 1, wherein, In the flow direction of the air, a first heat exchanger is arranged on the anode side pipe upstream of the first heater, a cold side flow channel of the first heat exchanger is connected to the anode side pipe, and an inlet of a hot side flow channel of the first heat exchanger is connected to an anode outlet of the electrolysis cell.

3. A solid oxide electrolyser system according to claim 1, wherein, A second heat exchanger is arranged between the connection position of the air pipe and the cathode side pipe and the second heater, a cold side flow channel of the second heat exchanger is connected to the cathode side pipe, and an inlet of a hot side flow channel of the second heat exchanger is connected to a cathode outlet of the electrolysis cell.

4. A solid oxide electrolyser system according to claim 3, wherein, A temperature sensor is arranged on the pipe between the second heater and the second heat exchanger.

5. A solid oxide electrolyser system according to claim 3, wherein, A temperature sensor and an oxygen sensor are arranged on the pipe between the cathode outlet of the electrolysis cell and the inlet of the hot side flow channel of the second heat exchanger.

6. A solid oxide electrolyser system according to claim 1, wherein, The air pipe is connected to a mixer arranged on the cathode side pipe, the mixer is connected to the steam flow adjusting assembly, and the mixer is also connected to a hydrogen supply system.

7. A solid oxide electrolyser system according to claim 6, wherein, The hydrogen supply system comprises a hydrogen supply pipe, an inlet end of the hydrogen supply pipe being connected to a hydrogen source, and an outlet end of the hydrogen supply pipe being connected to the mixer, in the flow direction of the hydrogen, a pressure reducing valve, a hydrogen pipe on-off valve, and a hydrogen flow controller are arranged on the hydrogen supply pipe in sequence.

8. A solid oxide electrolyser system according to claim 1, wherein, The air supply mechanism adopts a fan, an outlet of the fan is connected to the inlet of the anode side pipe and the air pipe, an anode on-off valve is arranged on the anode side pipe, and an air pipe valve is arranged on the air pipe. Alternatively, the air supply mechanism adopts a first fan and a second fan, the first fan is connected to the anode side pipe, the second fan is connected to the air pipe, and an air pipe valve is arranged on the air pipe. The steam flow adjusting assembly comprises an adjusting valve, and in the flow direction of the steam, a flow meter is arranged downstream of the adjusting valve.

9. A solid oxide electrolyser system according to claim 1, wherein, The air supply mechanism and the first heater are started to heat the anode side of the electrolysis cell, before the steam enters the cathode side pipe, the air pipe valve on the air pipe is opened, and the second heater is turned on, the air enters the cathode side pipe and is heated by the second heater to heat the cathode side of the electrolysis cell, after the cathode side of the electrolysis cell is heated, the air pipe valve is closed, the steam is introduced into the cathode side pipe through the steam flow adjusting assembly to blow the cathode side of the electrolysis cell, and when the temperature of the cathode outlet of the electrolysis cell reaches the set temperature, the starting process is completed.

10. A method of starting up a solid oxide electrolyser system according to any one of claims 1-9, characterised in that: ​

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