Electric heating combustion device for SOEC tail gas treatment and control method

Abstract

The application discloses an electric heating combustion device and a control method for SOEC tail gas treatment. The device comprises a gas storage tank, a buffer tank, a heating tank, a gas pump, a combustion furnace, a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve and a controller. The electric heating device is arranged, so that external fuel supply is not needed, catalyst replacement is not needed frequently, energy consumption is reduced, cost is reduced, gas components are not strictly required, flexibility is improved, the controller can control the electromagnetic valves to be closed after combustion is completed, flame backfire is avoided, safety is ensured, the buffer tank is arranged, quantitative gas is supplied to the combustion furnace, SOEC tail gas is ensured to be completely combusted, harmful substance emission is reduced, and environmental protection emission is realized.

Description

Technical Field

[0001] This invention relates to the field of exhaust gas treatment technology, and more specifically, to an electrically heated combustion device and control method for SOEC exhaust gas treatment. Background Technology

[0002] Solid oxide electrolyzers (SOECs) are a highly efficient electrochemical technology that utilizes renewable energy or industrial waste electricity to electrolyze water and carbon dioxide into hydrogen and carbon monoxide, achieving the production of green hydrogen energy and syngas. Compared to traditional electrolysis technologies, SOECs operate at high temperatures of 700℃-850℃, resulting in higher energy conversion efficiency, while also utilizing industrial waste heat to reduce overall energy consumption. This technology is widely considered a crucial supporting technology for hydrogen energy utilization and synthetic fuel production.

[0003] Because hydrogen is an explosive gas in exhaust gases, and carbon monoxide is not only explosive but also has a density similar to that of the atmosphere, direct release into the air will lead to localized overconcentration, which can cause poisoning. Therefore, the treatment of exhaust gases is extremely important during the relevant testing and development process.

[0004] Currently, the main methods for treating combustible gases, primarily hydrogen and carbon monoxide, in the exhaust gases of SOEC include catalytic oxidation, direct combustion, and adsorption separation.

[0005] Among them, catalytic oxidation method: using precious metal catalysts to oxidize hydrogen and carbon monoxide in exhaust gas at a lower temperature to reduce pollution emissions.

[0006] Direct combustion method: This method utilizes flames to burn combustible exhaust gases and typically relies on external fuel for combustion assistance.

[0007] Adsorption separation method: Hydrogen and carbon monoxide in exhaust gas are separated by adsorbents and then recycled.

[0008] However, each of the above methods has its drawbacks:

[0009] The disadvantages of catalytic oxidation are that the catalyst is prone to failure and needs to be replaced frequently, resulting in high long-term operating costs. It also has strict requirements on gas composition and flow rate, and can only be used when the composition and flow rate are strictly controlled, which reduces its flexibility.

[0010] Disadvantages of direct combustion: It relies on natural gas or other external fuels to maintain combustion, which increases energy consumption, poses a safety hazard of flame backfire, and easily produces pollutants when combustion is uneven.

[0011] Disadvantages of adsorption separation: The equipment is complex, requiring additional separation and recovery systems, increasing operating costs; the processing efficiency is limited by the performance of the adsorbent, and the effect is easily reduced due to adsorbent saturation.

[0012] It is evident that existing methods for treating exhaust gases are costly, inflexible, unsafe, and environmentally unfriendly. Summary of the Invention

[0013] This invention provides an electrically heated combustion device and control method for SOEC exhaust gas treatment, which can reduce costs, improve flexibility, ensure safety, and be environmentally friendly. The specific technical solution is as follows.

[0014] In a first aspect, the present invention provides an electrically heated combustion device for SOEC tail gas treatment, comprising:

[0015] Gas storage tank, buffer tank, heating tank, gas pump, combustion furnace, first solenoid valve, second solenoid valve, third solenoid valve and controller;

[0016] The inlet of the gas storage tank is connected to the emission device of the SOEC tail gas of the solid oxide electrolysis cell, the outlet of the gas storage tank is connected to the buffer tank through the first solenoid valve, the buffer tank is connected to the combustion furnace through the second solenoid valve, the gas pump is connected to the heating tank, and the heating tank is connected to the combustion furnace through the third solenoid valve.

[0017] The gas storage tank is equipped with a first pressure sensor, the buffer tank is equipped with a second pressure sensor, and the heating tank is equipped with a third pressure sensor and a temperature sensor. The heating tank is equipped with an electric heating device. The first pressure sensor is used to detect the gas pressure value in the gas storage tank, the second pressure sensor is used to detect the gas pressure value in the buffer tank, the third pressure sensor is used to detect the gas pressure value in the heating tank, and the temperature sensor is used to detect the temperature in the heating tank.

[0018] The first solenoid valve, the second solenoid valve, the third solenoid valve, the electric heating device, the air pump, the first pressure sensor, the second pressure sensor, the third pressure sensor, and the temperature sensor are all connected to the controller.

[0019] Optionally, the gas storage tank is also equipped with a carbon monoxide sensor, which is connected to the controller and is used to detect the carbon monoxide concentration in the gas storage tank.

[0020] Optionally, the above-mentioned electrically heated combustion device for SOEC exhaust gas treatment also includes an exhaust pipe;

[0021] The combustion furnace is connected to the exhaust pipe.

[0022] Optionally, the first solenoid valve, the second solenoid valve, and the third solenoid valve are all two-position two-way solenoid valves.

[0023] In a second aspect, the present invention provides a control method for an electrically heated combustion device for SOEC exhaust gas treatment, characterized in that the method is executed on a controller of the electrically heated combustion device for SOEC exhaust gas treatment as described in any one of the first aspects, comprising:

[0024] When the temperature detected by the temperature sensor in the heating tank is lower than the first preset temperature value, the electric heating device is controlled to heat the tank.

[0025] When the air pressure value detected by the third pressure sensor in the heating tank is lower than the first preset air pressure value, the air pump is controlled to work.

[0026] When the pressure value detected by the first pressure sensor in the gas storage tank exceeds the second preset pressure value, the first solenoid valve is controlled to open.

[0027] When the second pressure sensor detects that the air pressure in the buffer tank exceeds the third preset air pressure value, the third pressure sensor detects that the air pressure in the heating tank exceeds the first preset air pressure value, and the temperature sensor detects that the temperature in the heating tank is higher than the first preset temperature value, the third solenoid valve is controlled to open, wherein the third preset air pressure value is less than the second preset air pressure value;

[0028] When the pressure value in the buffer tank detected by the second pressure sensor exceeds the third preset pressure value, and the opening time of the third solenoid valve reaches the preset opening duration, the second solenoid valve is controlled to open.

[0029] Optionally, the control method for the electrically heated combustion device used for SOEC exhaust gas treatment further includes:

[0030] When the pressure value detected by the first pressure sensor in the gas storage tank is lower than the fourth preset pressure value, the first solenoid valve is controlled to close, wherein the fourth preset pressure value is less than the second preset pressure value.

[0031] Optionally, the control method for the electrically heated combustion device used for SOEC exhaust gas treatment further includes:

[0032] When the second pressure sensor detects that the air pressure in the buffer tank is lower than the fifth preset air pressure value, it controls the second solenoid valve to close, wherein the fifth preset air pressure value is less than the third preset air pressure value.

[0033] Optionally, the control method for the electrically heated combustion device used for SOEC exhaust gas treatment further includes:

[0034] When the second pressure sensor detects that the air pressure in the buffer tank is lower than the fifth preset air pressure value, it controls the third solenoid valve to close, wherein the fifth preset air pressure value is less than the third preset air pressure value.

[0035] Optionally, the control method for the electrically heated combustion device used for SOEC exhaust gas treatment further includes:

[0036] When the temperature detected by the temperature sensor in the heating tank is higher than the second preset temperature value, the electric heating device is controlled to turn off, wherein the second preset temperature value is greater than the first preset temperature value.

[0037] Optionally, the control method for the electrically heated combustion device used for SOEC exhaust gas treatment further includes:

[0038] When the third pressure sensor detects that the air pressure in the heating tank exceeds the sixth preset air pressure value, it controls the air pump to shut down, wherein the sixth preset air pressure value is greater than the first preset air pressure value.

[0039] As described above, the electrically heated combustion device for SOEC exhaust gas treatment provided in this embodiment of the invention may include: a gas storage tank, a buffer tank, a heating tank, an air pump, a combustion furnace, a first solenoid valve, a second solenoid valve, a third solenoid valve, and a controller; the inlet of the gas storage tank is connected to the SOEC exhaust gas emission device, the outlet of the gas storage tank is connected to the buffer tank through the first solenoid valve, the buffer tank is connected to the combustion furnace through the second solenoid valve, the air pump is connected to the heating tank, and the heating tank is connected to the combustion furnace through the third solenoid valve; the gas storage tank is equipped with a first pressure sensor, the buffer tank is equipped with a second pressure sensor, the heating tank is equipped with a third pressure sensor and a temperature sensor, and an electric heating device is provided inside the heating tank; the first pressure sensor is used to detect the gas pressure value in the gas storage tank, the second pressure sensor is used to detect the gas pressure value in the buffer tank, the third pressure sensor is used to detect the gas pressure value in the heating tank, and the temperature sensor is used to detect the temperature in the heating tank; the first solenoid valve, the second solenoid valve, the third solenoid valve, the electric heating device, the air pump, the first pressure sensor, the second pressure sensor, the third pressure sensor, and the temperature sensor are all connected to the controller. Therefore, by setting up an electric heating device, there is no need for external fuel supply or frequent catalyst replacement, reducing energy consumption and costs. At the same time, there are no strict requirements on gas composition, which improves flexibility. After combustion, the controller can control the closure of each solenoid valve to prevent flame backfire and ensure safety. In addition, by setting up a buffer tank to supply a fixed amount of gas to the combustion furnace, it is ensured that SOEC exhaust gas is completely combusted, reducing the emission of harmful substances and achieving environmentally friendly emissions.

[0040] The innovative aspects of this invention include:

[0041] 1. The electric heating combustion device for SOEC exhaust gas treatment provided in this embodiment of the invention eliminates the need for external fuel supply and frequent catalyst replacement by setting up an electric heating device, thereby reducing energy consumption and costs. It also has no strict requirements on gas composition, improving flexibility. Furthermore, the controller can close each solenoid valve after combustion to prevent flame backfire and ensure safety. At the same time, by setting up a buffer tank to supply a fixed amount of gas to the combustion furnace, it ensures complete combustion of SOEC exhaust gas, reduces the emission of harmful substances, and achieves environmentally friendly emissions.

[0042] 2. By setting up an electric heating device, the air in the heating tank is preheated at high temperature, which improves combustion efficiency, ensures complete combustion of hydrogen and carbon monoxide in SOEC exhaust gas, reduces pollutant emissions, and the pure electric heating method can avoid open flame, thus improving safety and stability.

[0043] 3. When the carbon monoxide sensor detects that the concentration of carbon monoxide in the gas storage tank meets the emission standards, it can be released immediately without further combustion.

[0044] 4. By setting up exhaust pipes, the harmless gases produced by combustion in the furnace are discharged into the external environment.

[0045] 5. The control method for the electrically heated combustion device for SOEC exhaust gas treatment provided in this embodiment of the invention eliminates the need for external fuel supply and frequent catalyst replacement by using an electrically heated device, thus reducing energy consumption and costs. It also offers greater flexibility by not imposing strict requirements on gas composition. Furthermore, the controller can close all solenoid valves after combustion to prevent flame backfire and ensure safety. Simultaneously, a buffer tank supplies a fixed amount of gas to the combustion furnace, ensuring complete combustion of the SOEC exhaust gas, reducing harmful emissions, and achieving environmentally friendly emissions. Additionally, the controller can automatically control the opening of each solenoid valve based on pressure and temperature sensors, thereby ensuring that both the SOEC exhaust gas and the heated air in the heating tank are fed into the combustion furnace for combustion, achieving automated control, improving safety, and facilitating operation.

[0046] 6. When the gas pressure value detected by the first pressure sensor in the gas storage tank is lower than the fourth preset gas pressure value, automatic control is achieved by controlling the first solenoid valve to close.

[0047] 7. When the second pressure sensor detects that the air pressure in the buffer tank is lower than the fifth preset air pressure value, the second solenoid valve is closed to achieve automatic control and prevent SOEC exhaust gas leakage from causing danger.

[0048] 8. When the second pressure sensor detects that the air pressure in the buffer tank is lower than the fifth preset air pressure value, automatic control is achieved by controlling the third solenoid valve to close.

[0049] 9. When the temperature in the heating tank detected by the temperature sensor is higher than the second preset temperature value, the electric heating device is turned off to achieve automatic control, while avoiding excessive heating time and potential danger.

[0050] 10. When the third pressure sensor detects that the air pressure in the heating tank exceeds the sixth preset air pressure value, the air pump is shut down to achieve automatic control and prevent the air pressure in the heating tank from becoming too high and causing danger.

[0051] Of course, implementing any product or method of the present invention does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0052] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0053] Figure 1 This is a schematic diagram of an electrically heated combustion device for SOEC exhaust gas treatment provided in an embodiment of the present invention;

[0054] Figure 2 This is a control schematic diagram of the controller for an electrically heated combustion device for SOEC exhaust gas treatment provided in an embodiment of the present invention;

[0055] Figure 3 This is a schematic flowchart of a control method for an electrically heated combustion device for SOEC exhaust gas treatment provided in an embodiment of the present invention.

[0056] Figure 1 The components are: 1. Gas storage tank; 2. Buffer tank; 3. Heating tank; 4. Air pump; 5. Combustion furnace; 6. First solenoid valve; 7. Second solenoid valve; 8. Third solenoid valve; 9. First pressure sensor; 10. Second pressure sensor; 11. Third pressure sensor; 12. Temperature sensor; 13. Electric heating device; 14. Carbon monoxide sensor; 15. Exhaust pipe. Detailed Implementation

[0057] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0058] It should be noted that the terms "comprising" and "having," and any variations thereof, in the embodiments and drawings of this invention are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0059] This invention discloses an electrically heated combustion device and control method for SOEC exhaust gas treatment, which can reduce costs, improve flexibility, ensure safety, and be environmentally friendly. The embodiments of this invention are described in detail below.

[0060] Example 1

[0061] Figure 1 This is a schematic diagram of an electrically heated combustion device for SOEC exhaust gas treatment provided in an embodiment of the present invention. See also... Figure 1 The electrically heated combustion device for SOEC exhaust gas treatment provided in this embodiment of the invention may include:

[0062] The gas storage tank 1, buffer tank 2, heating tank 3, gas pump 4, combustion furnace 5, first solenoid valve 6, second solenoid valve 7, third solenoid valve 8, and controller, wherein the first solenoid valve, second solenoid valve, and third solenoid valve can all be two-position two-way solenoid valves.

[0063] The inlet of the gas storage tank 1 is connected to the emission device of the SOEC (Solid Oxide Electrolysis Cell) tail gas to collect SOEC tail gas. The outlet of the gas storage tank 1 is connected to the buffer tank 2 through the first solenoid valve 6. The buffer tank 2 is connected to the combustion furnace 5 through the second solenoid valve 7. The gas pump 4 is connected to the heating tank 3. The heating tank 3 is connected to the combustion furnace 5 through the third solenoid valve 8.

[0064] The buffer tank 2, with a smaller volume than the gas storage tank 1, is used to supply a fixed amount of gas to the combustion furnace 5 to ensure stable combustion. The combustion furnace 5 is used to burn hydrogen and carbon monoxide in the SOEC tail gas, ensuring complete oxidation.

[0065] See also Figure 1 The gas storage tank 1 is equipped with a first pressure sensor 9, the buffer tank 2 is equipped with a second pressure sensor 10, and the heating tank 3 is equipped with a third pressure sensor 11 and a temperature sensor 12. The heating tank 3 is equipped with an electric heating device 13. The power of the electric heating device 13 needs to ensure that the chemical reaction meets the gas flow requirements. For example, the electric heating device 13 can be an electric heating wire.

[0066] The first pressure sensor 9 is used to detect the gas pressure value in the gas storage tank 1, the second pressure sensor 10 is used to detect the gas pressure value in the buffer tank 2, the third pressure sensor 11 is used to detect the gas pressure value in the heating tank 3, the temperature sensor 12 is used to detect the temperature in the heating tank 3, and the electric heating device is used to preheat the air in the heating tank 3 to a temperature that allows hydrogen and carbon monoxide to react chemically and completely oxidize, so as to promote combustion. For example, this temperature can be 650 degrees Celsius.

[0067] The first solenoid valve 6, the second solenoid valve 7, the third solenoid valve 8, the electric heating device 13, the air pump 4, the first pressure sensor 9, the second pressure sensor 10, the third pressure sensor 11, and the temperature sensor 12 are all connected to the controller.

[0068] Figure 2 A schematic diagram of the controller for an electrically heated combustion device for SOEC exhaust gas treatment provided in an embodiment of the present invention. See also... Figure 2 The controller receives the gas pressure of gas storage tank 1, the CO concentration of gas storage tank 1, the gas pressure of buffer tank 2, the gas pressure of heating tank 3, and the temperature of heating tank 3 in real time. Then, based on the received signals, it controls the first solenoid valve 6 at the outlet of gas storage tank 1, the second solenoid valve 7 at the outlet of buffer tank 2, the third solenoid valve 8 at the outlet of heating tank 3, the electric heating device 13 in heating tank 3, and the air pump 4.

[0069] The working process of the electrically heated combustion device for SOEC exhaust gas treatment provided in this embodiment of the invention is as follows:

[0070] Air pump 4 pumps outside air into heating tank 3, and SOEC exhaust gas enters storage tank 1. When the first pressure sensor 9 detects that the air pressure in storage tank 1 meets the opening conditions, the controller controls the first solenoid valve 6 to open, allowing SOEC exhaust gas to enter buffer tank 2. The controller also controls the electric heating device 13 to start. When the second pressure sensor 10 detects that the air pressure in buffer tank 2 meets the opening conditions, the third pressure sensor 11 detects that the air pressure in heating tank 3 meets the opening conditions, and the temperature sensor 12 detects that the temperature in heating tank 3 meets the opening conditions, the controller controls the third solenoid valve 8 to open. When the second pressure sensor 10 detects that the air pressure in buffer tank 2 meets the opening conditions, and the opening time of the third solenoid valve 8 reaches the preset opening time, the controller controls the second solenoid valve 7 to open. At this time, both the SOEC exhaust gas in buffer tank 2 and the heated air in heating tank 3 enter the combustion furnace 5 for combustion. After complete combustion, the harmless gases are discharged. After combustion, the controller can control each solenoid valve to close.

[0071] As can be seen from the above, the electrically heated combustion device for SOEC exhaust gas treatment provided in this embodiment of the invention may include: a gas storage tank 1, a buffer tank 2, a heating tank 3, an air pump 4, a combustion furnace 5, a first solenoid valve 6, a second solenoid valve 7, a third solenoid valve 8, and a controller; the inlet of the gas storage tank 2 is connected to the SOEC exhaust gas emission device, the outlet of the gas storage tank 2 is connected to the buffer tank 2 through the first solenoid valve 6, the buffer tank 2 is connected to the combustion furnace 5 through the second solenoid valve 7, the air pump 4 is connected to the heating tank 3, and the heating tank 3 is connected to the combustion furnace 5 through the third solenoid valve 8; the gas storage tank 1 is equipped with a first pressure sensor 9, and the buffer tank 2 is equipped with a first solenoid valve 8. Two pressure sensors 10 and 12 are installed in the heating tank 3. An electric heating device 13 is installed inside the heating tank 3. A first pressure sensor 9 detects the gas pressure in the gas storage tank 1, a second pressure sensor 10 detects the gas pressure in the buffer tank 2, a third pressure sensor 11 detects the gas pressure in the heating tank 3, and a temperature sensor 12 detects the temperature in the heating tank 3. The first solenoid valve 6, the second solenoid valve 7, the third solenoid valve 8, the electric heating device 13, the air pump 4, the first pressure sensor 9, the second pressure sensor 10, the third pressure sensor 11, and the temperature sensor 12 are all connected to the controller. Therefore, by setting up the electric heating device 13, no external fuel supply is required, and frequent catalyst replacement is unnecessary, reducing energy consumption and costs. It also does not have strict requirements on gas composition, improving flexibility. Furthermore, the controller can close each solenoid valve after combustion to prevent flame backfire and ensure safety. Simultaneously, by setting up the buffer tank 2, a fixed amount of gas is supplied to the combustion furnace 5, ensuring complete combustion of SOEC exhaust gas, reducing harmful emissions, and achieving environmentally friendly emissions.

[0072] Furthermore, by setting up an electric heating device 13, the air in the heating tank 3 is preheated at high temperature, which improves combustion efficiency, ensures complete combustion of hydrogen and carbon monoxide in SOEC exhaust gas, reduces pollutant emissions, and the pure electric heating method can avoid open flames, thus improving safety and stability.

[0073] In one embodiment, the gas storage tank 1 is also equipped with a carbon monoxide sensor 14, which is connected to a controller and is used to detect the carbon monoxide concentration in the gas storage tank 1.

[0074] When the carbon monoxide sensor 14 detects that the concentration of carbon monoxide in the gas storage tank 1 meets the emission standards, it can be released immediately without further combustion.

[0075] In one embodiment, the electric heating combustion device for SOEC exhaust gas treatment further includes an exhaust pipe 15, and the combustion furnace 5 is connected to the exhaust pipe 15.

[0076] Therefore, by setting up an exhaust pipe 15, the harmless gas produced by combustion in the combustion furnace 5 is discharged into the external environment.

[0077] Example 2

[0078] Figure 3 This is a schematic flowchart illustrating a control method for an electrically heated combustion device for SOEC exhaust gas treatment provided in an embodiment of the present invention. The method is applied to the controller of any of the electrically heated combustion devices for SOEC exhaust gas treatment provided in Embodiment 1. The method specifically includes the following steps.

[0079] S110: When the temperature in the heating tank detected by the temperature sensor is lower than the first preset temperature value, the electric heating device is controlled to heat the tank.

[0080] The temperature sensor detects the temperature in the heating tank in real time and sends it to the controller. When the temperature detected by the temperature sensor in the heating tank is lower than the first preset temperature value T1, it means that the temperature in the heating tank is too low to reach the temperature at which the hydrogen and carbon monoxide in the SOEC exhaust gas can undergo a complete chemical reaction and oxidation. Therefore, heating is required. The controller controls the electric heating device to perform heating. For example, the first preset temperature value T1 can be 650 degrees Celsius.

[0081] S120: When the air pressure value detected by the third pressure sensor in the heating tank is lower than the first preset air pressure value, control the air pump to work.

[0082] The third pressure sensor detects the air pressure value in the heating tank in real time and sends it to the controller. When the air pressure value detected by the third pressure sensor in the heating tank is lower than the first preset air pressure value P1, it indicates that the air pressure in the heating tank is low. At this time, the controller needs to control the air pump to pump outside air into the heating tank 3. The first preset air pressure value P1 can be set according to actual needs.

[0083] S130: When the pressure value in the gas storage tank detected by the first pressure sensor exceeds the second preset pressure value, the first solenoid valve is opened.

[0084] The first pressure sensor detects the gas pressure in the gas tank in real time and sends it to the controller. When the gas pressure detected by the first pressure sensor exceeds the second preset gas pressure value P2, it indicates that the gas pressure in the gas tank is too high. The controller needs to control the first solenoid valve to open, so as to fill the buffer tank with gas from the gas tank. The second preset gas pressure value P2 can be set according to the size of the gas tank.

[0085] S140: When the second pressure sensor detects that the air pressure in the buffer tank exceeds the third preset air pressure value, the third pressure sensor detects that the air pressure in the heating tank exceeds the first preset air pressure value, and the temperature sensor detects that the temperature in the heating tank is higher than the first preset temperature value, the third solenoid valve is controlled to open, wherein the third preset air pressure value is less than the second preset air pressure value.

[0086] The second pressure sensor detects the air pressure in the buffer tank in real time and sends it to the controller; the third pressure sensor detects the air pressure in the heating tank in real time and sends it to the controller; and the temperature sensor detects the temperature in the heating tank in real time and sends it to the controller.

[0087] When the second pressure sensor detects that the air pressure in the buffer tank exceeds the third preset air pressure value P3, the third pressure sensor detects that the air pressure in the heating tank exceeds the first preset air pressure value P1, and the temperature sensor detects that the temperature in the heating tank is higher than the first preset temperature value T1, it indicates that the air pressure in the buffer tank is relatively high, the air pressure in the heating tank is relatively high, and the temperature in the heating tank is relatively high, reaching the temperature at which the hydrogen and carbon monoxide in the SOEC tail gas undergo a complete chemical reaction and oxidation. Therefore, the controller controls the third solenoid valve to open, allowing the heated air in the heating tank to enter the combustion furnace 5. The third preset air pressure value P3 is less than the second preset air pressure value P2, and the third preset air pressure value P3 can be set according to the volume of the buffer tank.

[0088] S150: When the air pressure value detected by the second pressure sensor in the buffer tank exceeds the third preset air pressure value, and the opening time of the third solenoid valve reaches the preset opening duration, the second solenoid valve is controlled to open.

[0089] The second pressure sensor detects the air pressure value in the buffer tank in real time and sends it to the controller. When the air pressure value in the buffer tank detected by the second pressure sensor exceeds the third preset air pressure value P3, and the opening time of the third solenoid valve reaches the preset opening time t1, it indicates that the air pressure in the buffer tank is relatively large and the combustion furnace 5 is filled with heated air, which can make the hydrogen and carbon monoxide in the SOEC tail gas undergo a chemical reaction and be completely oxidized.

[0090] Therefore, the controller controls the second solenoid valve to open, allowing a fixed amount of SOEC tail gas from the buffer tank to be introduced into the combustion furnace 5. This causes the hydrogen in the SOEC tail gas to react chemically with the oxygen in the heated air to produce water, and the carbon monoxide in the SOEC tail gas to react chemically with the oxygen in the heated air to produce carbon dioxide.

[0091] As described above, the control method for the electrically heated combustion device for SOEC exhaust gas treatment provided in this embodiment of the invention may include controlling the electrically heated device to heat when the temperature in the heating tank detected by the temperature sensor is lower than a first preset temperature value, and controlling the air pump to operate when the gas pressure value in the heating tank detected by the third pressure sensor is lower than the first preset gas pressure value. When the gas pressure value in the gas storage tank detected by the first pressure sensor exceeds a second preset gas pressure value, the first solenoid valve is controlled to open. When the gas pressure value in the buffer tank detected by the second pressure sensor exceeds a third preset gas pressure value, the gas pressure value in the heating tank detected by the third pressure sensor exceeds the first preset gas pressure value, and the temperature sensor detects that the temperature in the heating tank is higher than the first preset temperature value, the third solenoid valve is controlled to open, wherein the third preset gas pressure value is less than the second preset gas pressure value, and the second preset temperature value is greater than the first preset temperature value. When the gas pressure value in the buffer tank detected by the second pressure sensor exceeds the third preset gas pressure value, and the opening time of the third solenoid valve reaches a preset opening duration, the second solenoid valve is controlled to open. Therefore, by incorporating an electric heating device, no external fuel supply or frequent catalyst replacement is required, reducing energy consumption and costs. Furthermore, it offers greater flexibility by not imposing strict requirements on gas composition. The controller can also close all solenoid valves after combustion to prevent flame backfire and ensure safety. Additionally, a buffer tank supplies a fixed amount of gas to the combustion furnace, ensuring complete combustion of SOEC exhaust gas, reducing harmful emissions, and achieving environmentally friendly emissions. Moreover, the controller can automatically control the opening of solenoid valves based on pressure and temperature sensors, ensuring that both SOEC exhaust gas and heated air from the heating tank are fed into the combustion furnace for combustion, achieving automated control, improving safety, and enhancing ease of operation.

[0092] In one implementation, the control method for the electrically heated combustion device for SOEC exhaust gas treatment may further include:

[0093] When the pressure value detected by the first pressure sensor in the gas storage tank is lower than the fourth preset pressure value, the first solenoid valve is controlled to close, wherein the fourth preset pressure value is less than the second preset pressure value.

[0094] When the pressure value detected by the first pressure sensor in the gas storage tank is lower than the fourth preset pressure value, it indicates that the gas pressure in the gas storage tank is low and no SOEC exhaust gas needs to be treated. At this time, the controller controls the first solenoid valve to close. The fourth preset pressure value (P2-ΔP1) is less than the second preset pressure value P2, and ΔP1 can be set according to actual needs.

[0095] Therefore, when the gas pressure value detected by the first pressure sensor in the gas storage tank is lower than the fourth preset gas pressure value, automatic control is achieved by controlling the first solenoid valve to close.

[0096] In one implementation, the control method for the electrically heated combustion device for SOEC exhaust gas treatment may further include:

[0097] When the second pressure sensor detects that the air pressure in the buffer tank is lower than the fifth preset air pressure value, it controls the second solenoid valve to close, wherein the fifth preset air pressure value is less than the third preset air pressure value.

[0098] When the second pressure sensor detects that the gas pressure in the buffer tank is lower than the fifth preset gas pressure value, it indicates that the gas pressure in the buffer tank is low and there is no need to treat the SOEC exhaust gas. At this time, the controller controls the second solenoid valve to close. The fifth preset gas pressure value (P3-ΔP2) is less than the third preset gas pressure value P3, and ΔP2 can be set according to actual needs.

[0099] Therefore, when the second pressure sensor detects that the gas pressure in the buffer tank is lower than the fifth preset gas pressure value, the second solenoid valve is closed to achieve automatic control, while avoiding the danger of SOEC exhaust gas leakage.

[0100] In one implementation, the control method for the electrically heated combustion device for SOEC exhaust gas treatment may further include:

[0101] When the second pressure sensor detects that the air pressure in the buffer tank is lower than the fifth preset air pressure value, it controls the third solenoid valve to close, wherein the fifth preset air pressure value is less than the third preset air pressure value.

[0102] When the second pressure sensor detects that the gas pressure in the buffer tank is lower than the fifth preset gas pressure value, it indicates that the gas pressure in the buffer tank is low and there is no need to treat the SOEC exhaust gas. Therefore, there is no need to charge air into the combustion furnace 5. Thus, the controller controls the third solenoid valve to close. The fifth preset gas pressure value (P3-ΔP2) is less than the third preset gas pressure value P3, and ΔP2 can be set according to actual needs.

[0103] Therefore, when the second pressure sensor detects that the air pressure in the buffer tank is lower than the fifth preset air pressure value, automatic control is achieved by controlling the third solenoid valve to close.

[0104] In one implementation, the control method for the electrically heated combustion device for SOEC exhaust gas treatment may further include:

[0105] When the temperature in the heating tank detected by the temperature sensor is higher than the second preset temperature value, the electric heating device is controlled to turn off, wherein the second preset temperature value (T1+ΔT) is greater than the first preset temperature value T1.

[0106] When the temperature sensor detects that the temperature in the heating tank is higher than the second preset temperature value, it indicates that the temperature in the heating tank is too high and there is no need to continue heating. Therefore, the controller controls the electric heating device to turn off. The second preset temperature value (T1+ΔT) is greater than the first preset temperature value T1, and ΔT can be set according to actual needs.

[0107] Therefore, when the temperature in the heating tank detected by the temperature sensor is higher than the second preset temperature value, the electric heating device is turned off to achieve automatic control, while avoiding excessive heating time and potential danger.

[0108] In one implementation, the control method for the electrically heated combustion device for SOEC exhaust gas treatment may further include:

[0109] When the third pressure sensor detects that the air pressure in the heating tank exceeds the sixth preset air pressure value, it controls the air pump to shut down. The sixth preset air pressure value is greater than the first preset air pressure value.

[0110] When the third pressure sensor detects that the gas pressure in the heating tank exceeds the sixth preset gas pressure value, it indicates that the gas pressure in the heating tank is too high and there is no need to continue filling. Therefore, the controller controls the air pump to shut down. The sixth preset gas pressure value (P1+ΔP3) is greater than the first preset gas pressure value, and ΔP3 can be set according to actual needs.

[0111] Therefore, when the third pressure sensor detects that the air pressure in the heating tank exceeds the sixth preset air pressure value, the air pump is shut down to achieve automatic control, while avoiding the danger of excessive air pressure in the heating tank.

[0112] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of one embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing the present invention.

[0113] Those skilled in the art will understand that the modules in the apparatus of the embodiments can be distributed in the apparatus of the embodiments as described in the embodiments, or they can be located in one or more devices different from this embodiment with corresponding changes. The modules of the above embodiments can be combined into one module, or they can be further divided into multiple sub-modules.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electrically heated combustion device for SOEC tail gas treatment, characterized in that, include: Gas storage tank, buffer tank, heating tank, gas pump, combustion furnace, first solenoid valve, second solenoid valve, third solenoid valve and controller; The inlet of the gas storage tank is connected to the emission device of the SOEC tail gas. The outlet of the gas storage tank is connected to the buffer tank through the first solenoid valve. The buffer tank is connected to the combustion furnace through the second solenoid valve. The air pump is connected to the heating tank. The air pump pumps outside air into the heating tank. The heating tank is connected to the combustion furnace through the third solenoid valve. The gas storage tank is equipped with a first pressure sensor, the buffer tank is equipped with a second pressure sensor, and the heating tank is equipped with a third pressure sensor and a temperature sensor. The heating tank is equipped with an electric heating device. The first pressure sensor is used to detect the gas pressure value in the gas storage tank, the second pressure sensor is used to detect the gas pressure value in the buffer tank, the third pressure sensor is used to detect the gas pressure value in the heating tank, and the temperature sensor is used to detect the temperature in the heating tank. The first solenoid valve, the second solenoid valve, the third solenoid valve, the electric heating device, the air pump, the first pressure sensor, the second pressure sensor, the third pressure sensor, and the temperature sensor are all connected to the controller.

2. The electrically heated combustion device for SOEC exhaust gas treatment as described in claim 1, characterized in that, The gas storage tank is also equipped with a carbon monoxide sensor, which is connected to the controller and is used to detect the carbon monoxide concentration in the gas storage tank.

3. The electrically heated combustion device for SOEC exhaust gas treatment as described in claim 1, characterized in that, It also includes exhaust pipes; The combustion furnace is connected to the exhaust pipe.

4. The electrically heated combustion device for SOEC exhaust gas treatment as described in claim 1, characterized in that, The first solenoid valve, the second solenoid valve, and the third solenoid valve are all two-position two-way solenoid valves.

5. A control method for an electrically heated combustion device for SOEC exhaust gas treatment, characterized in that, The method is applied to the controller of the electrically heated combustion device for SOEC exhaust gas treatment according to any one of claims 1-4, and includes: When the temperature detected by the temperature sensor in the heating tank is lower than the first preset temperature value, the electric heating device is controlled to heat the tank. When the air pressure value detected by the third pressure sensor in the heating tank is lower than the first preset air pressure value, the air pump is controlled to work. When the pressure value detected by the first pressure sensor in the gas storage tank exceeds the second preset pressure value, the first solenoid valve is controlled to open. When the second pressure sensor detects that the air pressure in the buffer tank exceeds the third preset air pressure value, the third pressure sensor detects that the air pressure in the heating tank exceeds the first preset air pressure value, and the temperature sensor detects that the temperature in the heating tank is higher than the first preset temperature value, the third solenoid valve is controlled to open, wherein the third preset air pressure value is less than the second preset air pressure value; When the pressure value in the buffer tank detected by the second pressure sensor exceeds the third preset pressure value, and the opening time of the third solenoid valve reaches the preset opening duration, the second solenoid valve is controlled to open.

6. The control method for the electrically heated combustion device for SOEC exhaust gas treatment as described in claim 5, characterized in that, Also includes: When the pressure value detected by the first pressure sensor in the gas storage tank is lower than the fourth preset pressure value, the first solenoid valve is controlled to close, wherein the fourth preset pressure value is less than the second preset pressure value.

7. The control method for the electrically heated combustion device for SOEC exhaust gas treatment as described in claim 5, characterized in that, Also includes: When the second pressure sensor detects that the air pressure in the buffer tank is lower than the fifth preset air pressure value, it controls the second solenoid valve to close, wherein the fifth preset air pressure value is less than the third preset air pressure value.

8. The control method for the electrically heated combustion device for SOEC exhaust gas treatment as described in claim 5, characterized in that, Also includes: When the second pressure sensor detects that the air pressure in the buffer tank is lower than the fifth preset air pressure value, it controls the third solenoid valve to close, wherein the fifth preset air pressure value is less than the third preset air pressure value.

9. The control method for the electrically heated combustion device for SOEC exhaust gas treatment as described in claim 5, characterized in that, Also includes: When the temperature detected by the temperature sensor in the heating tank is higher than the second preset temperature value, the electric heating device is controlled to turn off, wherein the second preset temperature value is greater than the first preset temperature value.

10. The control method for the electrically heated combustion device for SOEC exhaust gas treatment as described in claim 5, characterized in that, Also includes: When the third pressure sensor detects that the air pressure in the heating tank exceeds the sixth preset air pressure value, it controls the air pump to shut down, wherein the sixth preset air pressure value is greater than the first preset air pressure value.

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