Optimization method of medium and large solid oxide battery system and battery system thereof

Abstract

The invention relates to an optimization method of a medium-and-large-sized solid oxide battery system and a battery system thereof, which are suitable for medium-and-large-sized distributed power stations above an MW level, and are characterized in that: 1) a plurality of electric pile modules are connected in parallel and share one BOP system; (2) a switch valve is arranged between each galvanic pile module and the BOP system, so that physical separation between the galvanic pile module and the BOP system is realized; and 3) collecting and purifying the tail gas generated by the galvanic pile module, and then treating according to one of the following modes: 3.1) recovering the heat energy of the tail gas, and coupling the tail gas to a BOP system to form a complete heat energy utilization system; and 3.2) the BOP system is additionally provided with an independent combustor, heat energy is provided for the BOP system, and tail gas is used for the energy conversion process outside the system. Through the innovative BOP system and electric pile hot area configuration, the efficient tail gas utilization strategy and the flexible application of the independent combustor, the equipment cost and the maintenance difficulty are remarkably reduced, and the overall efficiency, the flexibility and the environmental protection performance of the system are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of solid fuel cells, and relates to an optimization method for a medium-to-large solid oxide battery system of a medium-to-large distributed power station above MW level and a battery system thereof. Background Art

[0002] As the global demand for clean energy continues to grow, medium and large distributed power stations, as an important part of power supply, are increasingly valued for their efficiency, economy and environmental performance. As a type of clean energy technology, the solid oxide fuel cell system has shown great potential in the field of distributed power stations with its advantages such as high energy efficiency, low emissions and fuel flexibility. When the solid oxide fuel cell system in the existing technology is used in medium and large distributed power stations, one set of stack modules corresponds to one set of BOP modules; the material flow and energy coupling design of the stack module and the BOP module can maximize the power generation efficiency. In the actual application process, the existing technology often faces challenges such as high system complexity, expensive equipment cost and difficult maintenance. The shortcomings are reflected in:

[0003] 1. Difficulty in maintaining high-power equipment: The stack module and the BOP module are designed in a one-to-one manner, which means that high-power equipment requires a high-power stack module. Once a stack in the stack module needs to be replaced, the entire equipment needs to be shut down, and the operation is complicated and time-consuming, affecting the operating efficiency of the power station.

[0004] 2. Difficulty in adjusting thermal balance: The high coupling between the fuel cell stack and the BOP system leads to slow thermal balance adjustment and many influencing factors. When the power generation needs to be adjusted frequently over a large range, it is difficult to accurately adjust the parameters, which affects the optimal working conditions of the fuel cell stack.

[0005] 3. Limited utilization of low-grade tail gas: The high coupling between the fuel cell stack and the BOP system will also lead to limited regulation of the thermal-electric ratio of the equipment and low tail gas temperature, which limits the application scope of combined heat and power or trigeneration of heat, cooling and power.

[0006] Therefore, it is necessary to optimize the solid oxide fuel cell systems of existing medium and large distributed power stations to improve the overall efficiency of the system, reduce equipment costs, enhance the maintainability and replaceability of the system, and realize the recovery and utilization of exhaust gas. Summary of the invention

[0007] The first technical problem to be solved by the present invention is to provide an optimization method for medium-to-large solid oxide battery systems suitable for medium-to-large distributed power stations above MW level, which has the characteristics of scientific and reasonable system design, high efficiency and low maintenance difficulty, while reducing equipment costs and improving system reliability, flexibility and comprehensive energy efficiency.

[0008] The second technical problem to be solved by the present invention is to provide a medium-to-large solid oxide battery system suitable for medium-to-large distributed power stations above MW level, which has the characteristics of scientific and reasonable system design, high efficiency and low maintenance difficulty, while reducing equipment costs and improving system reliability, flexibility and comprehensive energy efficiency.

[0009] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: an optimization method for medium-to-large solid oxide battery systems, which is applicable to medium-to-large distributed power stations above MW level, and is characterized in that:

[0010] 1) Multiple stack modules are connected in parallel and share a BOP system;

[0011] 2) A first switch valve is set between each stack module and the BOP system to achieve physical separation between the two;

[0012] 3) After the exhaust gas generated by the stack module is collected and purified, it can be processed in one of the following modes:

[0013] 3.1) Tail gas heat energy recovery and coupling to the BOP system to form a complete heat energy utilization system;

[0014] 3.2) An independent burner is added to the BOP system to provide heat energy for the BOP system, and the exhaust gas is used for the energy conversion process outside the system.

[0015] Preferably, the MW level is 1 MW to 100 MW.

[0016] Furthermore, the BOP system is an auxiliary system of the fuel cell, including a hydrogen circulation system, an air circulation system, a water circulation system and a water heat management system.

[0017] Furthermore, the BOP system is divided into a cold zone BOP and a hot zone BOP. The cold zone BOP includes feed pipelines for natural gas, water, and air and metering modules on their respective pipelines; the hot zone BOP includes a reformer, a fuel preheater, an evaporator, an air preheater and its internal tail gas burner and connecting pipelines and valves.

[0018] Furthermore, the collection and purification includes high-temperature anode tail gas treatment and high-temperature cathode tail gas treatment. The anode tail gas of each stack module is combined and sent to the high-temperature anode tail gas treatment, and the cathode tail gas of each stack module is combined and sent to the high-temperature cathode tail gas treatment.

[0019] Finally, the energy conversion process outside the system is a heating machine, a refrigerator or a combustion engine.

[0020] The technical solution adopted by the present invention to solve the second technical problem is: a medium-to-large solid oxide battery system, suitable for medium-to-large distributed power stations above MW level, which includes multiple battery stack modules, a BOP system, and an exhaust gas collection and purification system, characterized in that:

[0021] Multiple fuel cell modules are connected in parallel and connected to a BOP system together, and a first switch valve is set between each fuel cell module and the BOP system to achieve physical separation between the two; the exhaust gas generated by the fuel cell module is transported to the collection and purification system, and then connected to the exhaust gas heat recovery device, and coupled to the BOP system to form a complete heat energy utilization system; or, connected to an energy conversion device outside the fuel cell system, and an external independent burner is added to connect the natural gas feed pipeline and the air feed pipeline and their respective control valves, and the high-temperature gas of the external independent burner is transported to the device that needs to be preheated in the BOP system, and then discharged through the exhaust pipe.

[0022] Preferably, the devices that need to be preheated in the BOP system include a fuel preheater, an evaporator, an air preheater and a reformer.

[0023] Furthermore, the collection and purification system includes a high-temperature anode tail gas collection device and a high-temperature cathode tail gas collection device. The anode tail gas of each stack module is combined and sent to the high-temperature anode tail gas collection device, and the cathode tail gas of each stack module is combined and sent to the high-temperature cathode tail gas collection device.

[0024] Finally, the high-temperature anode exhaust gas collection device is connected to the internal exhaust gas burner through the second switch valve and the pipeline. At the same time, the high-temperature cathode exhaust gas collection device is also connected to the internal exhaust gas burner through the second switch valve and the pipeline. In conjunction with the combustion and heat generation, the high-temperature gas is transported through the second switch valve and the pipeline and connected to the reformer, fuel preheater, air preheater and evaporator for auxiliary preheating, and finally discharged through the exhaust pipe.

[0025] Compared with the prior art, the advantages of the present invention are:

[0026] 1. Design a modular architecture so that multiple stack modules can share the BOP system, reducing the number of BOP systems, thereby reducing equipment costs and maintenance difficulties. Each stack module has the ability to operate independently, and the coordination and balance between modules are achieved through an intelligent control system, which improves the reliability and flexibility of the system;

[0027] 2. The first switch valve V1 is set between the fuel cell stack and the BOP system to achieve physical separation between the two, simplifying the system control process, reducing system complexity, and improving system maintainability;

[0028] 3) Design an exhaust gas heat recovery device to recycle the heat energy of the exhaust gas;

[0029] The present invention has the characteristics of scientific and reasonable design, high system efficiency and stable operation. Through the innovative BOP system and fuel cell hot zone configuration, exhaust gas efficient utilization strategy and flexible application of independent burners, it not only significantly reduces the equipment cost and maintenance difficulty of medium and large distributed power stations, but also improves the overall efficiency, flexibility and environmental protection performance of the system. At the same time, it reduces equipment costs, improves system reliability, flexibility and comprehensive energy efficiency, and enhances the maintainability and replaceability of the system. It has broad application prospects and important promotion value in the field of large distributed power stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural block diagram of the solid oxide fuel cell system provided by the present invention. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below with reference to the accompanying drawings.

[0032] like Figure 1 As shown, an optimization method for medium-to-large solid oxide battery systems suitable for medium-to-large distributed power stations above MW level, wherein the MW level is 1MW to 100MW; specifically:

[0033] 1) Multiple stack modules are connected in parallel and share a BOP system; the BOP system is an auxiliary system for fuel cells, including a hydrogen circulation system, an air circulation system, a water circulation system and a water heat management system; the BOP system is divided into a cold zone BOP and a hot zone BOP. The cold zone BOP includes the feed pipelines of natural gas, water and air and their respective metering modules on the pipelines; the hot zone BOP includes a reformer, a fuel preheater, an evaporator, an air preheater and its internal tail gas burner and connecting pipelines and valves;

[0034] 2) A first switch valve is set between each stack module and the BOP system to achieve physical separation between the two;

[0035] 3) After the tail gas generated by the stack module is collected and purified, it can be treated in one of the following modes. The collection and purification includes high-temperature anode tail gas treatment and high-temperature cathode tail gas treatment. The anode tail gas of each stack module is combined and sent to the high-temperature anode tail gas treatment, and the cathode tail gas of each stack module is combined and sent to the high-temperature cathode tail gas treatment:

[0036] 3.1) Tail gas heat energy recovery and coupling to the BOP system to form a complete heat energy utilization system;

[0037] 3.2) The BOP system is equipped with external independent burners, which can be multiple groups, to provide heat energy for the BOP system, and the exhaust gas is used for the energy conversion process outside the system. The energy conversion process outside the system is a heating machine, a refrigerator or a gas engine.

[0038] Optimized solid oxide fuel cell systems for medium and large distributed power stations above MW level, such as Figure 1 As shown, it includes multiple stack modules, a BOP system, and an exhaust gas collection and purification system. Multiple stack modules are connected in parallel and connected to a BOP system. A first switch valve V1 is set between each stack module and the BOP system to achieve physical separation between the two. Usually, the first switch valve V1 can be set on the front and rear pipelines of each stack module; the stack module generates exhaust gas and transports it to the collection and purification system, and then connects it to the exhaust gas heat recovery device, and is coupled to the BOP system to form a complete heat energy utilization system; or, it is connected to an energy conversion device outside the fuel cell system through a pipeline and a third switch valve V3. The energy conversion device can be a heating machine, a refrigerator or a combustion engine, and an external independent burner is added to connect the natural gas feed pipeline and the air feed pipeline and their respective control valves. The high-temperature gas of the external independent burner is transported through the pipeline and the third switch valve V3 to the device that needs to be preheated in the BOP system, and then emptied through the exhaust pipe. The devices that need to be preheated in the BOP system include fuel preheaters, evaporators, air preheaters, and reformers. In this embodiment, the high-temperature gas of an external independent burner is transported through a pipeline and a third switch valve V3 to connect to the internal tail gas burner, reformer, and fuel preheater for auxiliary preheating in sequence, and finally the low-temperature exhaust gas is discharged. The high-temperature gas of another external independent burner is transported through a pipeline and a third switch valve V3 to connect to the air preheater and evaporator for auxiliary preheating in sequence, and finally the low-temperature exhaust gas is discharged. The collection and purification system includes a high-temperature anode tail gas collection device and a high-temperature cathode tail gas collection device, which can usually be arranged in parallel, and the anode tail gas of each stack module is combined to send to the high-temperature anode tail gas collection device, and the cathode tail gas of each stack module is combined to send to the high-temperature cathode tail gas collection device. The high-temperature anode exhaust gas collection device is connected to the internal exhaust gas burner through the second switch valve V2 and the pipeline. At the same time, the high-temperature cathode exhaust gas collection device is also connected to the internal exhaust gas burner through the second switch valve V2 and the pipeline. In conjunction with the combustion and heat generation, the high-temperature gas is transported through the second switch valve V2 and the pipeline to the reformer, fuel preheater, air preheater and evaporator for auxiliary preheating. The second switch valve V2 is connected between the fuel preheater and the air preheater. This embodiment adopts sequential preheating and finally discharged through the exhaust pipe.

[0039] The improvements of the present invention are described in detail below:

[0040] (1) Mode 1: High-efficiency utilization mode of exhaust gas heat energy, close all second switch valves (open valve V2 for normal process), open all third switch valves (open valve V3 for high exhaust gas process)

[0041] Design of tail gas heat recovery device: Integrate an efficient tail gas heat recovery device in the BOP system, which can capture and convert the heat energy in the tail gas generated by the SOFC stack. This heat energy is then used to preheat the reactant gas entering the stack, heat water or generate steam, etc., thereby significantly improving the overall energy efficiency of the system. Advantages: This mode is particularly suitable for situations where the system is running stably and the output power demand is relatively stable. By maximizing the recovery and utilization of tail gas heat energy, energy waste is reduced and the system economy is improved.

[0042] (2) Mode 2: No exhaust gas recovery and independent burner mode, close all third switch valves (open valve V3 for high exhaust gas process), open all second switch valves (open valve V2 for normal process) Exhaust gas is used for other purposes: When the system faces frequent and large-scale changes in output power or large-scale heating needs, it can be switched to this mode. At this time, the exhaust gas is no longer recovered into the system, but is collected and used in other energy conversion processes.

[0043] Introducing independent burners: The system is equipped with independent burners, which burn the collected tail gas as fuel or combustion-supporting gas, and the generated high-temperature and high-pressure gas or steam can be used for heating, power generation or other industrial processes. This design allows flexible adjustment of operating parameters, such as adjusting the heat and electricity ratio according to actual needs, to ensure that the energy type and value output by the system can meet changing needs.

[0044] Advantages: This mode enhances the flexibility and response speed of the system, and can quickly adapt to fluctuations in external loads and diverse energy needs. At the same time, by flexibly adjusting the thermoelectric ratio and maintaining the consistency of the thermal environment of the stack, it helps to improve the stability of the stack and extend its service life.

[0045] Switching between the above two modes:

[0046] Intelligent control system: Introduce advanced intelligent control system to monitor the system's operating status and external demand changes in real time. Automatically or semi-automatically achieve smooth switching between the two modes based on preset strategies or real-time data analysis results.

[0047] Optimize operating efficiency: Through precise regulation of the intelligent control system, the system can maintain the best working state and energy utilization efficiency in different operating modes. When high power output is required, mode 1 is used to ensure the maximum utilization of exhaust heat energy; when flexible adjustment of output power or large-scale heating is required, switch to mode 2 to meet diverse energy needs.

[0048] Specific implementation methods of the present invention

[0049] 1. Modularized stack and BOP system design: According to the scale and needs of the power plant, multiple SOFC stack modules are designed, each module contains a certain number of stack units. All stack modules share a BOP system to achieve the transmission and distribution of heat and gas through pipes and valves.

[0050] 2. High-temperature valves and local maintenance: Install high-temperature valves between the stack module and the BOP system to ensure that the connection between the two can be quickly cut off or restored when necessary. When a stack module needs maintenance, close the corresponding high-temperature valve and isolate the module to perform local maintenance operations.

[0051] 3. Design of exhaust heat recovery device:

[0052] Equipment selection: Select a suitable tail gas heat recovery device based on the tail gas characteristics (such as temperature, flow rate, composition, etc.) generated by the SOFC stack. The device should have high thermal efficiency and durability and be able to adapt to the corrosive components in the tail gas.

[0053] System integration: Integrate the tail gas heat recovery device into the BOP system to ensure that the tail gas can flow smoothly into the recovery device and effectively release heat energy. At the same time, design a reasonable heat transfer path to use the recovered heat energy to preheat the reaction gas, heat water or generate steam, etc.

[0054] Optimize thermal energy utilization: Rationally allocate recovered thermal energy according to system requirements. For example, when preheating the reaction gas, ensure that the preheating temperature is moderate and uniform to avoid overheating or overcooling that may adversely affect the performance of the fuel cell stack.

[0055] Energy efficiency monitoring: Install energy efficiency monitoring equipment to monitor the exhaust heat recovery efficiency and the overall energy efficiency of the system in real time. Adjust the working parameters of the heat recovery device in a timely manner according to the monitoring results to ensure that the system always operates in the best condition.

[0056] Efficient use of tail gas in BOP and flexible switching mode of independent burners

[0057] Mode 1 Implementation Method

[0058] 1. Exhaust gas collection and purification:

[0059] First, the tail gas generated by the SOFC stack is collected through a pipeline. The tail gas may contain incompletely reacted fuel, water vapor, and a small amount of pollutants.

[0060] The tail gas is purified to remove pollutants and ensure that the tail gas entering the BOP system is clean and pollution-free. The purification methods may include dust removal, desulfurization, denitrification, etc.

[0061] 2. Exhaust heat recovery:

[0062] An exhaust gas heat recovery device, such as a heat exchanger, is installed in the BOP system. When the exhaust gas passes through the heat exchanger, the heat energy in it is transferred to the medium that needs to be preheated (such as air, water or heat transfer oil, etc.).

[0063] According to system requirements, the structure and process of the heat exchanger are reasonably designed to ensure that the exhaust gas heat energy is maximized.

[0064] Coupled heat exchange and system integration:

[0065] Connect the tail gas heat recovery device with other parts of the BOP system (such as preheater, steam generator, etc.) to form a complete heat energy utilization system.

[0066] The coupled heat exchange process is precisely controlled through an intelligent control system to ensure that the system can maintain high energy efficiency under different working conditions.

[0067] Mode 2 Implementation

[0068] Independent burner configuration

[0069] Equipment selection: Select a suitable independent burner according to system requirements. The burner should have the characteristics of efficient combustion, stable and reliable, and flexible adjustment.

[0070] Adjustment of the ratio of heat to electricity: Adjust the ratio of heat to electricity according to the actual needs of the system. Through the flow rate and combustion efficiency of the independent burner, the precise control of the heat and electricity output is achieved.

[0071] Thermal environment maintenance: While adjusting the thermoelectric ratio, pay attention to monitoring and maintaining the thermal environment consistency of the stack. By adjusting parameters such as preheating temperature and reaction gas flow, ensure that the stack always operates in the best thermal environment to improve its stability and life.

[0072] Two mode switching and intelligent control

[0073] Mode switching logic:

[0074] Design clear mode switching logic and conditions. Automatically or semi-automatically switch between the two modes according to the system operating status and external demand changes (such as output power demand, heating demand, etc.).

[0075] Set reasonable switching thresholds and delay mechanisms to avoid adverse effects of frequent switching on system stability and energy efficiency.

[0076] Intelligent control system:

[0077] Introduce advanced intelligent control systems to monitor and analyze system operating status and external demand changes in real time. Improve system response speed and decision-making accuracy through algorithm optimization and data processing technology.

[0078] The integrated human-machine interaction interface and remote monitoring function make it convenient for operators to monitor and operate the system in real time. At the same time, it provides fault diagnosis and early warning functions to ensure safe and stable operation of the system.

[0079] The technical effects obtained by the present invention are:

[0080] 1. Significantly reduce equipment costs and investment risks: By adopting a modular design in which one set of auxiliary systems corresponds to multiple small stacking areas, the large-scale stacking area construction required for a single high-power device is effectively reduced, thereby reducing the overall equipment cost. At the same time, the modular design makes system construction more flexible and can be gradually expanded according to actual needs, reducing the risk of initial investment.

[0081] 2. Improve system maintainability and replaceability: When a small stack area fails, the present invention allows the stack area to be quickly replaced as a whole without shutting down the entire system, thereby significantly shortening the maintenance time and reducing the impact on power plant operations. This design not only improves the maintainability of the system, but also enhances the reliability and stability of the system.

[0082] 3. Enhance system flexibility and adaptability: By adding a high-temperature stop valve and an independent burner to the BOP system, the present invention realizes flexible switching of the gas path and work flow. This flexibility enables the system to better adapt to changes in external loads and diverse heating needs, whether it is frequent and large-scale changes in output power or large-scale heating, the requirements can be met by switching the work flow.

[0083] 4. Improve the overall efficiency and energy utilization of the system: By optimizing the configuration of the BOP and the hot zone of the fuel cell stack, as well as the efficient utilization strategy of the tail gas in the BOP, the thermal balance speed inside the system is accelerated, and the fuel cell stack can be more accurately maintained in the optimal working conditions, thereby improving the overall efficiency of the system. At the same time, the efficient utilization strategy of tail gas not only reduces energy waste, but also broadens the application scope of combined heat and power and trigeneration, further improving the energy utilization of the system.

[0084] 5. Promote flexible adjustment of heat-electric ratio: The introduction of independent burners enables the system to adjust the heat-electric ratio as needed to meet the energy needs of different application scenarios. This flexibility not only improves the operating efficiency of the system, but also enhances the system's adaptability to different energy needs.

[0085] 6. Enhance environmental performance:

[0086] It further improves the energy utilization efficiency of the system, reduces energy waste and pollutant emissions, and helps achieve green and low-carbon electricity supply.

[0087] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An optimization method for medium-to-large solid oxide battery systems, applicable to medium-to-large distributed power stations above MW level, characterized in that: 1) Multiple stack modules are connected in parallel and share a BOP system; 2) A first switch valve is set between each stack module and the BOP system to achieve physical separation between the two; 3) After the exhaust gas generated by the stack module is collected and purified, it can be processed in one of the following modes: 3.1) Tail gas heat energy recovery and coupling to the BOP system to form a complete heat energy utilization system; 3.2) An independent burner is added to the BOP system to provide heat energy for the BOP system, and the exhaust gas is used for the energy conversion process outside the system.

2. The optimization method according to claim 1, characterized in that: The MW class is 1 MW class to 100 MW class.

3. The optimization method according to claim 1, characterized in that: The BOP system is an auxiliary system of the fuel cell, including a hydrogen circulation system, an air circulation system, a water circulation system and a water heat management system.

4. The optimization method according to claim 1, characterized in that: The BOP system is divided into a cold zone BOP and a hot zone BOP. The cold zone BOP includes feed pipelines for natural gas, water, and air and metering modules on their respective pipelines; the hot zone BOP includes a reformer, a fuel preheater, an evaporator, an air preheater, its internal tail gas burner, and connecting pipelines and valves.

5. The optimization method according to claim 1, characterized in that: The collection and purification includes high-temperature anode tail gas treatment and high-temperature cathode tail gas treatment. The anode tail gas of each stack module is combined and sent to the high-temperature anode tail gas treatment, and the cathode tail gas of each stack module is combined and sent to the high-temperature cathode tail gas treatment.

6. The optimization method according to claim 1, characterized in that: The energy conversion process outside the system is a heating machine, a refrigerator or a combustion engine.

7. A medium-to-large solid oxide battery system, suitable for medium-to-large distributed power stations above MW level, comprising multiple battery stack modules, a BOP system, and an exhaust gas collection and purification system, characterized in that: Multiple fuel cell modules are connected in parallel and connected to a BOP system together, and a first switch valve is set between each fuel cell module and the BOP system to achieve physical separation between the two; the exhaust gas generated by the fuel cell module is transported to the collection and purification system, and then connected to the exhaust gas heat recovery device, and coupled to the BOP system to form a complete heat energy utilization system; or, connected to an energy conversion device outside the fuel cell system, and an external independent burner is added to connect the natural gas feed pipeline and the air feed pipeline and their respective control valves, and the high-temperature gas of the external independent burner is transported to the device that needs to be preheated in the BOP system, and then discharged through the exhaust pipe.

8. The medium to large solid oxide battery system according to claim 7, characterized in that: The devices that need to be preheated in the BOP system include a fuel preheater, an evaporator, an air preheater and a reformer.

9. The medium to large solid oxide battery system according to claim 7, characterized in that: The collection and purification system includes a high-temperature anode tail gas collection device and a high-temperature cathode tail gas collection device. The anode tail gas of each stack module is combined and sent to the high-temperature anode tail gas collection device, and the cathode tail gas of each stack module is combined and sent to the high-temperature cathode tail gas collection device.

10. The medium to large solid oxide battery system according to claim 9, characterized in that: The high-temperature anode tail gas collection device is connected to the internal tail gas burner through the second switch valve and the pipeline. At the same time, the high-temperature cathode tail gas collection device is also connected to the internal tail gas burner through the second switch valve and the pipeline. In conjunction with the combustion and heat generation, the high-temperature gas is transported through the second switch valve and the pipeline and connected to the reformer, fuel preheater, air preheater and evaporator for auxiliary preheating, and finally discharged through the exhaust pipe.

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