Power Generation System

Abstract

The present invention discloses a power generation system, which comprises: a power generation module (100), comprising a start-stop burner (200) and a plurality of stack units (300) arranged around the circumference of the start-stop burner and stacked axially; and an insulation box (400), which is arranged around the outer periphery of the power generation module (100), and is additionally provided with an insulation box as a heat insulation structure, and adopts a structural form in which all power generation modules, heat exchangers and other high-temperature components and gas distribution ducts are built into the insulation box, so as to ensure that all heat sources are concentrated in the insulation box, and a near-heat isolation system is formed between the insulation box and the environment, thereby reducing environmental heat dissipation and effectively improving the thermal efficiency of the system. In addition, the start-stop burner is built into the center of the power generation module, and heat is transferred from the inside to the outside, thereby minimizing heat loss, and the structure is compact and highly integrated.

Description

Technical Field

[0001] The present invention belongs to the technical field of fuel cells, and in particular, relates to a power generation system. Background Art

[0002] Solid oxide fuel cells (SOFCs) have the advantages of wide fuel adaptability, high energy conversion efficiency, all-solid-state, modular assembly, and zero pollution. They can directly use a variety of hydrocarbon fuels such as hydrogen, carbon monoxide, natural gas, liquefied gas, coal gas, and biomass gas. They have broad application prospects. In the SOFC system, the startup combustion and tail gas treatment functions are generally the same start-stop burner device. At startup, the fuel gas enters the start-stop burner, and the combustion flue gas is mixed into the cathode tail gas flow through the radiator, and heat is exchanged with the cathode heat exchanger and reformer to achieve full utilization of heat.

[0003] The operating temperature in the syngas SOFC system is generally up to 800°C. In addition to utilizing the heat generated by the stack itself during the electrochemical reaction, the entire system also needs to burn the fuel tail gas with air to provide heat to maintain the thermal balance of the stack itself and the operating temperature of the system. However, the existing heat exchanger is relatively large in size, has low heat exchange efficiency, and has severe heat dissipation. In addition, the start-stop burner is located outside the hot zone, forming a strong heat dissipation with the environment, which affects the thermal efficiency.

[0004] In addition, in the existing design, the anode heat exchanger is built into the system, and the cathode heat exchanger is arranged at the outermost side of the system. For small systems or battery stack power generation module systems with a large volume power density, the number of battery stack units is small and the internal space of the module is limited, making overall integration difficult. Summary of the invention

[0005] In view of the above-mentioned defects or shortcomings of the prior art, the present invention provides a power generation system, which has a compact structure and a small specific surface area to reduce environmental heat dissipation, effectively improve the system thermal efficiency, reduce pollutant emissions, and improve the safety of the power generation system.

[0006] To achieve the above object, the invention provides a power generation system, the power generation system comprising:

[0007] The power generation module comprises a start-stop burner and a plurality of stack unit groups arranged around the circumference of the start-stop burner and stacked axially; and a heat preservation box arranged around the outer periphery of the power generation module.

[0008] In some embodiments, the power generation module is cylindrical and includes a cylinder top wall, a cylinder bottom wall and a cylinder peripheral wall formed between the cylinder top wall and the cylinder bottom wall. The start-stop burner is located in the cylinder peripheral wall and is coaxially arranged on the cylinder bottom wall.

[0009] In some embodiments, a plurality of the stack cell groups together form a stack cell group ring, and the stack cell group ring is arranged concentrically with the start-stop burner.

[0010] In some embodiments, the insulation box is a square box body and includes a first box part and a second box part spliced ​​to each other, the power generation system includes a load-bearing base for supporting the power generation module, and the bottom walls of the first box part and the second box part jointly form an accommodating gap for accommodating the load-bearing base.

[0011] In some embodiments, the power generation system further includes a heat exchanger for gas heat exchange, wherein the heat exchanger is built into the insulation box and located at an end of the power generation module.

[0012] In some embodiments, the heat exchanger is a plate fin heat exchanger.

[0013] In some embodiments, the heat exchanger includes a cathode heat exchanger for cathode gas heat exchange, the cathode heat exchanger includes a first cathode heat exchanger and a second cathode heat exchanger, the first cathode heat exchanger and the second cathode heat exchanger are installed on the top wall of the cylinder and are spaced apart radially along the cylinder.

[0014] In some embodiments, the heat exchanger further comprises an anode heat exchanger for heat exchange of anode gas, and the anode heat exchanger is located below the bottom of the bottom wall of the cylinder.

[0015] In some embodiments, the power generation system further includes an anode gas distribution pipeline and a cathode gas distribution pipeline, and the anode gas distribution pipeline and the cathode gas distribution pipeline are both located in the insulation box.

[0016] In some embodiments, the anode gas distribution duct includes an anode gas inlet main section and an anode gas outlet main section extending from the anode heat exchanger and coiled around the bottom of the bottom wall of the cylinder, and a plurality of anode gas inlet branch sections corresponding to the battery stack unit groups are extended from the anode gas inlet main section, and a plurality of anode gas outlet branch sections corresponding to the battery stack unit groups are extended from the anode gas outlet main section.

[0017] In some embodiments, the cathode gas distribution duct includes a cathode gas inlet cavity formed in a hollow cavity on the peripheral wall of the cylinder, a cathode exhaust gas outlet cavity located at the radial inner end of the stack unit group ring, a cathode air inlet and outlet pipe extending from the cathode heat exchange air outlet of the cathode heat exchanger and extending into the cathode gas inlet cavity, and a cathode exhaust gas inlet pipe extending from the cathode heat exchange exhaust inlet of the cathode heat exchanger and extending to the cathode exhaust gas outlet cavity.

[0018] In some embodiments, the power generation system also includes a swirl gas collecting cylinder located in the cathode exhaust gas outlet cavity and concentrically mounted on the start-stop burner, the swirl gas collecting cylinder including a cylinder circumferential wall and a swirl cylinder cavity defined by the cylinder circumferential wall, and the cylinder circumferential wall is provided with a plurality of swirl air inlets distributed along the circumferential direction and used to introduce the cathode exhaust gas into the swirl cylinder cavity.

[0019] In some embodiments, the power generation system further includes a plurality of power extraction ears extending from the bottom of the bottom wall of the cylinder and corresponding one-to-one to the battery stack unit groups.

[0020] In the power generation system of the present invention, an insulation box is added as a heat insulation structure and all power generation modules, heat exchangers and other high-temperature components and gas distribution pipes are built into the insulation box to ensure that all heat sources are concentrated in the insulation box, forming a near-heat isolation system with the environment, reducing environmental heat dissipation and effectively improving the thermal efficiency of the system. In addition, the start-stop burner is built into the center of the power generation module, and the heat is transferred from the inside to the outside, minimizing heat loss, and the structure is compact and highly integrated.

[0021] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 A working principle diagram of a power generation system according to a specific embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the three-dimensional structure of a power generation system according to a specific embodiment of the present invention;

[0025] Figure 3 for Figure 2 A partial three-dimensional structural diagram of the power generation module, heat exchanger and load-bearing base;

[0026] Figure 4 for Figure 3 Schematic diagram of the top view structure from different angles, showing the power generation module and cathode heat exchanger;

[0027] Figure 5 for Figure 3 A partial three-dimensional structural diagram of the power generation module, which specifically shows the external structure of the power generation module;

[0028] Figure 6 for Figure 5The schematic diagram of the structure from different perspectives specifically shows the external structure of the power generation module and part of the external structure of the anode gas distribution pipeline;

[0029] Figure 7 yes Figure 5 A partial three-dimensional structural diagram of the power generation module is shown in detail;

[0030] Figure 8 yes Figure 5 Schematic diagram of the structure from different perspectives, specifically showing the anode gas distribution pipeline;

[0031] Fig. 9 yes Figure 8 sectional view; specifically showing the cathode gas inlet cavity, cathode tail gas outlet cavity and start-stop burner; and

[0032] Fig.10 for Figure 7 Schematic diagram of the local structure from different perspectives, specifically showing the load-bearing base and anode heat exchanger.

[0033] Description of reference numerals:

[0034] 100 Power generation module 200 Start and stop burner

[0035] 300 battery stack unit group 400 insulation box

[0036] 500 Heat exchanger 600 Anode gas distribution pipeline

[0037] 110 cylinder top wall 120 cylinder bottom wall

[0038] 130 cylinder wall

[0039] 310 battery stack unit

[0040] 410 first box part 420 second box part

[0041] 510 Cathode heat exchanger 520 Anode heat exchanger

[0042] 610 Anode gas inlet pipe section 620 Anode gas outlet pipe section

[0043] 630 Anode gas inlet pipe section 640 Anode gas outlet pipe section

[0044] 710 cathode gas inlet chamber 720 cathode tail gas outlet chamber

[0045] 730 cathode air inlet and outlet pipe 740 cathode tail gas inlet pipe

[0046] 1 Load-bearing base 2 Power supply bracket

[0047] 3 Air conditioning pipe 4 Swirl air inlet

[0048] 5 Inner air vent grille 6 Air inlet pipe

[0049] 7 Cathode tail gas outlet pipe 8 Cathode tail gas outlet pipe

[0050] 9 Cyclone gas collecting cylinder

[0051] A1 Anode gas inlet A2 Anode tail gas outlet

[0052] B1 Cathode air inlet B2 Cathode exhaust gas outlet DETAILED DESCRIPTION

[0053] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0054] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0055] In the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used with reference to the directions shown in the drawings or are used to describe the relative positional relationships of components in the vertical, perpendicular or gravity direction.

[0056] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0057] The present invention provides a power generation system with a new structural design. The power generation system can use synthesis gas as fuel. Its start-stop burner can use synthesis gas as fuel. The fuel is hydrogen-rich and has a lower calorific value than natural gas. The flame propagation rate is fast and it is easy to form flashback, but the present invention is not limited to this.

[0058] This embodiment is described by taking a synthesis gas power generation system as an example. Figure 1 As shown, the working principle of the power generation system is as follows: the synthesis gas as the anode intake and the air as the cathode intake are respectively introduced into the power generation module 100 through the anode heat exchanger 520 and the cathode heat exchanger 510, and the module is started by igniting the start-stop burner 200. The current is loaded and an electrochemical reaction is gradually formed to release heat. At this time, the anode exhaust gas enters the anode heat exchanger 520 to exchange heat with the anode intake gas, and the cathode exhaust gas enters the cathode heat exchanger 510 to exchange heat with the cathode intake gas. When thermal equilibrium is reached, the start-up burner 200 is gradually closed, and the power generation module 100 relies on self-heating to maintain the thermal balance of the system to ensure the temperature required for the reaction.

[0059] The present invention aims to solve the problems of excessive environmental heat dissipation and low thermal efficiency of small solid oxide fuel cells. In small power generation systems, heat dissipation is relatively serious due to the relatively large size of the heat exchanger, low heat exchange efficiency, and relatively serious heat dissipation. In addition, the start-stop burner is located outside the hot zone, which forms a strong heat dissipation with the environment, affecting the thermal efficiency. In addition, the anode heat exchanger is built into the system, the cathode heat exchanger is arranged at the outermost side of the system, the number of fuel cell units is small, and the internal space of the module is limited, making overall integration difficult. Therefore, how to control excessive environmental heat dissipation and low thermal efficiency from a system perspective is a problem worthy of attention, and try to form a thermally isolated system, so as to reduce environmental heat dissipation and improve system thermal efficiency on the basis of high integration. See Figures 2 to 10 In a specific embodiment, the power generation system may include: a power generation module 100 and a heat preservation box 400;

[0060] The power generation module 100 includes a start-stop burner 200 and a plurality of stack unit groups 300 arranged around the circumference of the start-stop burner and stacked axially; and

[0061] The heat preservation box 400 is arranged around the outer periphery of the power generation module 100 .

[0062] In this embodiment, a new structural design form of a 20KW-class IGFC synthesis gas power generation system is proposed for a small solid oxide fuel cell. Since the existing power generation system has a lot of environmental heat dissipation and a low heat utilization rate, the present invention adds a heat insulation box 400 as a heat insulation structure, such as Figure 2 As shown. The power generation module 100 is built into the heat preservation box 400, which can be understood as isolating the high-temperature element, i.e., the heat source, from the environment to form a nearly thermally isolated power generation system. After the power generation system is started, since the start-stop burner 200 is built into the hot zone of the power generation module 100, a radiation effect of the heat source from the inside out is formed, further reducing the external environmental heat dissipation, effectively reducing heat loss, and improving thermal efficiency.

[0063] In addition, if Figure 7 , Figure 8 and Fig. 9 As shown, the power generation system includes multiple groups of integrated stack unit groups 300, and the power is effectively expanded. Each stack unit group 300 is a push-tower structure formed by stacking multiple stack units 310 in sequence, with high integration, and greatly reduced process difficulty and cost. For the stack unit group 300 and the stack unit 310, the stack unit group 300 can be four groups, and each stack unit group 300 can use four stack units 310 in series to form a 5KW-level push-tower structure, but is not limited to this.

[0064] The start-stop burner 300 is located in the hot zone to minimize heat loss and achieve high integration of the power generation module 100. Figures 4 to 7As shown, in this embodiment, the power generation module 100 may be cylindrical and include a cylinder top wall 110, a cylinder bottom wall 120, and a cylinder peripheral wall 130 formed between the cylinder top wall 110 and the cylinder bottom wall 120, and the start-stop burner 200 is located in the cylinder peripheral wall 130 and is coaxially arranged on the cylinder bottom wall 110. It can be understood that the start-stop burner 300 is located at the center of the power generation module 100, and when transferring heat, the heat is dissipated from the inside to the outside in the power generation module 100, which minimizes heat loss, and the power generation module 100 is cylindrical to reduce the volume of the power generation module 100 and improve the integration of the power generation module 100.

[0065] Furthermore, in order to make the power generation module 100 highly compact, Figure 8 and Fig. 9 As shown, in the present embodiment, a plurality of stack cell groups 300 are collectively formed into a stack cell group ring, and a plurality of stack cell groups 300 are arranged adjacent to each other and form a near-annular structure, namely, a stack cell group ring, and the stack cell group ring is arranged concentrically with the start-stop burner 200. It can be understood that the stack cell group 300 is formed into a circular ring, and the start-stop burner 200 is located at the center of the circular ring. This not only improves the integration of the overall structure of the stack cell group 300 and the start-stop burner 200, making the structure more compact, but also ensures uniform heat dissipation of the start-stop burner 200 from the inside to the outside, thereby improving the thermal utilization rate and safety stability of the power generation system.

[0066] Considering the process cost and operation convenience of the heat preservation box 400, the structure of the heat preservation box 400 is designed. Figure 1 As shown, in the present embodiment, the thermal insulation box 400 can be a square box that is easy to process. Of course, the shape structure of the thermal insulation box 400 is not limited to a rectangular structure. The thermal insulation box 400 can include a first box portion 410 and a second box portion 420 that are spliced ​​to each other. The first box portion 410 and the second box portion 420 can be connected by hinges or locks, but are not limited to this. Pipeline openings for accommodating pipelines and handle structures for easy grasping can be reserved on the first box portion 410 and the second box portion 420.

[0067] In addition, if Figure 1 , Figure 6 and Figure 7As shown, the power generation system may include a load-bearing base 1 for supporting the power generation module 100, and the bottom wall of the box body of the first box part 410 and the second box part 420 are jointly formed with a receiving notch for receiving the load-bearing base 1, which is not shown in the figure. It can be understood that the power generation module 100 is directly installed on the load-bearing base 1 and forms an integrated structure, and there is a certain gap between the two to form a pipeline receiving space. When installing the thermal insulation box 400, the load-bearing base 1 is inserted into the first box part 410 and the second box part 420 along the receiving notch, and the first box part 410 and the second box part 420 are spliced ​​and fixed, which has the advantages of simple installation and convenient operation. Among them, the load-bearing base 1 can be made of refractory bricks or corundum refractory insulation materials, but is not limited to this.

[0068] For the existing cylindrical power generation system, such as the self-produced air-open SOFC stack integrated power generation system module disclosed in US Patent US 009190673B2. In this system module, the flow of cathode gas and anode gas of the synthesis gas is large, the overall volume of the module is small, and the specific surface is large, so a cylindrical cathode heat exchanger and anode heat exchanger are equipped. Among them, the annular heat exchanger located on the outside has a large specific surface area, which makes the heat loss larger. And because the heat exchange intensity required by the synthesis gas is large and the gas flow is large, the cylindrical heat exchanger requires a large heat exchange area. If the square plate-fin heat exchanger with a larger heat exchange intensity is placed outside the module, the heat loss is greater, so the system may need to supplement auxiliary heat exchange equipment such as radiation heat exchangers. As a result, the number of equipment in the power generation system is diverse. In addition, the high-temperature air inlet of the cylindrical heat exchanger is located on the side wall, which is a non-traditional porous structure. The complex structure makes the manufacturing cost high, and under thermal stress conditions, it is easy to form leakage and short circuit problems in the cathode air heat exchanger.

[0069] Therefore, the present invention has carried out structural design on the heat exchange structure. In this embodiment, Figure 3 As shown, the power generation system also includes a heat exchanger 500 for gas heat exchange, which is also built into the insulation box 400 to ensure that the high-temperature heat source is enclosed in the insulation box 400 and is in a thermally isolated state from the outside world to prevent heat from being lost to the outside environment. The power generation module 100 and the heat exchanger 500 exchange heat with each other. In the working state, the power generation module 100 and the heat exchanger 500 heat up together, thereby improving the heating efficiency of the power generation system. The heat exchanger 500 is located at the end of the power generation module 100, that is, the heat exchanger 500 and the power generation module 100 can be arranged in a straight line from top to bottom, making the structure more compact and improving the overall integration of the power generation system.

[0070] Furthermore, if Figure 3 and Figure 4As shown, in this embodiment, the heat exchanger 500 can adopt a plate-fin heat exchanger with high process maturity, more compact structure and higher heat exchange efficiency. The heat exchanger has a square structure, and the anode and cathode outlet gases are used to preheat the anode and cathode inlet gases through the plate-fin heat exchanger. The heat exchanger has a relatively small volume and a small specific surface area. Under the premise of controlling costs and ensuring stable operation, the heat loss is small and the thermal efficiency is high.

[0071] Of course, since the power generation system includes anode gas and cathode gas, and the flow rate of cathode gas is relatively large, such as Figure 3 and Figure 4 As shown, in this embodiment, the heat exchanger 500 may include a cathode heat exchanger 510 for cathode gas heat exchange. In order to ensure the heat exchange efficiency, the cathode heat exchanger 510 may include a first cathode heat exchanger and a second cathode heat exchanger. The first cathode heat exchanger and the second cathode heat exchanger can be installed on the top wall 110 of the cylinder due to their relatively large volume. In order to further increase the longitudinal stacking height of the power generation system, the first cathode heat exchanger and the second cathode heat exchanger can be distributed at intervals along the radial direction of the cylinder.

[0072] At the same time, Figure 6 and Fig.10 As shown, in the present embodiment, the heat exchanger 500 also includes an anode heat exchanger 520 for anode gas heat exchange. Since the flow rate of the anode gas is relatively small, the size of the anode gas heat exchanger 520 is relatively small. The anode heat exchanger 520 can be located below the bottom of the cylinder bottom wall 120. Specifically, the load-bearing base 1 can form a heat exchanger gap of a certain size during the production process, and the anode heat exchanger 520 can be placed in the heat exchanger gap to further improve the integration of the power generation system.

[0073] In addition, the present invention further designs the pipeline arrangement of the power generation system, such as Figure 2 and Figure 3 As shown, in this embodiment, the power generation system may also include an anode gas distribution pipeline 600 and a cathode gas distribution pipeline. The anode gas distribution pipeline 600 and the cathode gas distribution pipeline are both located in the insulation box 400. The anode gas distribution pipeline 600 and the cathode gas distribution pipeline are used as heat sources and are enclosed in the insulation box 400. They are in a state of near thermal isolation from the outside to prevent heat from being lost to the outside environment. The power generation module 100, the heat exchanger 500 and the gas distribution pipeline exchange heat with each other. In the working state, the three heat up together to improve the heating efficiency of the power generation system. The operating temperature of the power generation system is 600-800℃. It is usually necessary to maintain the system balance by using the reaction heat release while igniting the chemical reaction. However, due to the thermal isolation of the power generation system in the present invention, the start-stop burner 200 can be turned off after completing the startup process. The system can maintain a balance condition of 700-800℃ by utilizing the heat generated by the electrochemical reaction of the battery stack and the mutual heat transfer between high-temperature components, so that the thermal utilization rate can be improved.

[0074] Specifically, in this embodiment, on the one hand, Figure 7 and Figure 8 As shown, the anode gas distribution pipeline 600 may include an anode gas inlet main section 610 and an anode gas outlet main section 620 extending from the anode heat exchanger 520 and coiled below the bottom of the cylinder bottom wall 120. A plurality of anode gas inlet branch sections 630 corresponding to the stack unit group 300 are extended from the anode gas inlet main section 610, and a plurality of anode gas outlet branch sections 640 corresponding to the stack unit group 300 are extended from the anode gas outlet main section 620. The anode gas inlet main section 610 and the anode gas outlet main section 620 are both annular coils and embedded in the pipeline accommodating space. The anode gas outlet main section 620, which is a high-temperature pipeline, may be located in the ring of the anode gas inlet main section 610, and the heat source radiates heat from the inside to the outside, thereby minimizing heat loss. Each stack unit group 300 is correspondingly provided with an anode air inlet branch section 630 and an anode air outlet branch section 640 , and the anode air inlet branch section 630 and the anode air outlet branch section 640 are in communication with each stack unit 310 .

[0075] Specifically, the anode gas heat exchange process is as follows: the anode fuel gas enters the anode heat exchanger 520 along the anode fuel gas inlet A1, the anode heat exchange fuel gas heat exchange outlet of the anode heat exchanger 520 is connected to the anode gas intake main section 610, the anode fuel gas enters the anode gas intake main section 610 and flows into each anode gas intake branch section 630, the anode gas intake branch section 630 passes the anode gas into each stack unit 310 to complete the anode gas intake, the anode tail gas after the reaction is discharged along each anode gas outlet branch section 640 and converges into the anode gas outlet main section 620, the anode gas outlet main section 620 is connected to the anode tail gas heat exchange inlet of the anode heat exchanger 520, so that the anode tail gas enters the anode heat exchanger 520 and exchanges heat with the anode gas intake in the anode heat exchanger 520, and then the anode tail gas is discharged along the anode tail gas outlet A2.

[0076] On the other hand, Figure 3 , Figure 4 and Fig. 9 As shown, in this embodiment, the cathode gas distribution duct includes a cathode gas inlet cavity 710 which is a hollow cavity formed in the peripheral wall 130 of the cylinder, a cathode tail gas outlet cavity 720 located at the radial inner end of the stack unit ring, a cathode gas inlet and outlet pipe 730 extending from the cathode heat exchange air outlet of the cathode heat exchanger 510 and extending into the cathode gas inlet cavity 710, and a cathode tail gas inlet pipe 740 extending from the cathode heat exchange tail gas inlet of the cathode heat exchanger 510 and extending to the cathode tail gas outlet cavity 720, wherein the cathode air adopts an open air intake method from the outside to the inside. In this embodiment, synthetic gas with a lower calorific value is used, which can appropriately reduce the amount of cooling air introduced, reduce the internal energy loss of the system, and improve energy utilization.

[0077] Specifically, the cathode gas heat exchange process is as follows: cathode air enters the two cathode heat exchangers 510 along the cathode air inlet B1 through the air inlet pipe 6, and enters the outer cathode gas inlet chamber 710 along the cathode air inlet and outlet pipe 730. An inner air ventilation grid 5 is provided on the inner shell of the cathode gas inlet chamber 710. Cathode air enters the stack unit group 300 through the inner air ventilation grid 5. The cathode exhaust gas after the reaction enters the cathode exhaust gas outlet chamber 720 and enters the cathode heat exchanger 510 along the cathode exhaust gas outlet pipe 8 connected to the cathode exhaust gas heat exchange inlet of the cathode heat exchanger 510. After exchanging heat with the cathode air in the cathode heat exchanger 510, the cathode air is discharged along the cathode exhaust gas outlet B2 of the cathode exhaust gas outlet pipe 7.

[0078] Furthermore, the power generation system may also include a swirl gas collecting cylinder 9 located in the cathode tail gas outlet cavity 720 and concentrically sleeved on the start-stop burner 200, the swirl gas collecting cylinder 9 includes a cylinder peripheral wall and a swirl cylinder cavity defined by the cylinder peripheral wall, and the cylinder peripheral wall is provided with a plurality of swirl air inlets 4 for introducing the cathode tail gas into the swirl cylinder cavity, which are distributed at intervals along the circumference. The swirl gas collecting cylinder 9 with a large cavity is arranged in the cathode tail gas outlet cavity 720, wherein the gas pipeline for the start-stop burner 200 can be a separate gas pipeline connected from the common pipeline of the power generation system.

[0079] When the power generation system is just started, since there is no electrochemical reaction, the cathode unreacted tail gas discharged from the cathode tail gas outlet cavity 720 is not heated and is directly discharged along the cyclone gas collector 9. After the start-stop burner 200 is started, the fuel gas and the combustion-supporting gas burn to produce combustion flue gas. The high-temperature flue gas enters the cyclone gas collector 9 and mixes with the cathode unreacted tail gas to form a high-temperature mixed gas. The high-temperature mixer preheats the cathode intake air through the cathode heat exchanger 510 so that the power generation system reaches the electrochemical reaction temperature. The power generation module 100 starts the electrochemical reaction. When the working state of maintaining the equilibrium state is reached, the start-stop burner 200 can be shut down.

[0080] After the electrochemical reaction occurs and before the start-stop burner 200 is shut down, the cathode tail gas enters the swirl cylinder cavity from the cathode tail gas outlet cavity 720 through the swirl air inlet 4 on the peripheral side, and the combustion flue gas enters the swirl gas collecting cylinder 9 from the bottom of the swirl gas collecting cylinder 9. The large volume of the swirl cylinder cavity can play a gas buffering role. The two inner and outer swirls can be fully mixed, the inner swirl is the high-temperature combustion flue gas, and the outer swirl is the relatively low-temperature cathode tail gas, so that the mixing can be more complete during the swirl process, and the local high-temperature points can be eliminated during the uniform mixing process, protecting the cathode heat exchanger 510 and improving the heat exchange efficiency in the cathode heat exchanger 510.

[0081] In this embodiment, if Figure 1 and Figure 2As shown, the power generation system also includes a plurality of power-taking lugs 2 extending from the bottom of the cylinder bottom wall 110 and corresponding one-to-one with the battery stack unit group 300 to facilitate power taking.

[0082] In addition, in order to ensure the normal combustion operation of the tail gas burner in the existing system, the utilization rate of the power generation module needs to be controlled to ensure the content of combustibles. NO is easily generated during the combustion process. x The present invention eliminates the tail gas combustion heating process, eliminates the working restrictions of the low calorific value tail gas burner, broadens the upper limit of fuel utilization, avoids the emission of pollutants such as NOx generated during the combustion process, and improves system safety.

[0083] At the same time, Figure 3 As shown, an air conditioning pipe 3 for inputting air or relieving pressure is also provided on the cathode tail gas outlet pipe 8. The air conditioning pipe 3 is provided as an air conditioning port and a venting port before the cathode tail gas enters the cathode heat exchanger 510, so as to facilitate the implementation of protective intervention under over-temperature and over-pressure conditions or in an emergency, and provide over-temperature and over-pressure protection for high-temperature components. It can be understood that, when necessary, the air is exhausted to the outside through the air conditioning pipe 3 to relieve pressure, so as to ensure the stability of the back pressure of the system and the safety of the power generation module, or when the cathode heat exchanger 510 is over-temperature, etc., additional air can be introduced into the cathode tail gas outlet cavity 720 through the air conditioning pipe 3 to reduce the temperature of the high-temperature mixed gas and protect the cathode heat exchanger 510.

[0084] It should be particularly noted that other components and functions of the power generation system in the embodiment of the present invention are well known to ordinary technicians in the field, and are not described here in order to reduce redundancy.

[0085] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, such as simple changes in the number, aperture, and shape of each air through hole during multi-stage combustion. These simple modifications all fall within the protection scope of the present invention.

[0086] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0087] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A power generation system, characterized in that: The power generation system comprises: A power generation module (100) comprises a start-stop burner (200) and a plurality of stack unit groups (300) arranged around the circumference of the start-stop burner and stacked axially; and A heat exchanger (500) for gas heat exchange; Anode gas distribution pipeline (600); A cathode gas distribution pipeline, comprising a cathode gas inlet cavity (710) and a cathode tail gas outlet cavity (720); A cyclone gas collecting cylinder (9), located in the cathode tail gas outlet cavity (720) and concentrically sleeved on the start-stop burner (200); The heat preservation box (400) is arranged around the outer periphery of the power generation module (100), and the heat exchanger (500), the anode gas distribution pipeline (600), the cathode gas distribution pipeline, and the cyclone gas collecting cylinder (9) are all located in the heat preservation box (400).

2. The power generation system according to claim 1, characterized in that: The power generation module (100) is cylindrical and comprises a cylinder top wall (110), a cylinder bottom wall (120), and a cylinder peripheral wall (130) formed between the cylinder top wall (110) and the cylinder bottom wall (120); the start-stop burner (200) is located inside the cylinder peripheral wall (130) and is coaxially arranged on the cylinder bottom wall (120).

3. The power generation system according to claim 2, characterized in that: The plurality of battery stack unit groups (300) together form a battery stack unit group ring, and the battery stack unit group ring is arranged concentrically with the start-stop burner (200).

4. The power generation system according to claim 2, characterized in that: The thermal insulation box (400) is a square box body and comprises a first box part (410) and a second box part (420) which are spliced ​​to each other. The power generation system comprises a load-bearing base (1) for supporting the power generation module (100). The bottom walls of the first box part (410) and the second box part (420) are jointly formed with a receiving notch for accommodating the load-bearing base (1).

5. The power generation system according to claim 2, characterized in that: The heat exchanger (500) is located at the end of the power generation module (100).

6. The power generation system according to claim 5, characterized in that: The heat exchanger (500) is a plate-fin heat exchanger.

7. The power generation system according to claim 5, characterized in that: The heat exchanger (500) includes a cathode heat exchanger (510) for cathode gas heat exchange, and the cathode heat exchanger (510) includes a first cathode heat exchanger and a second cathode heat exchanger, wherein the first cathode heat exchanger and the second cathode heat exchanger are mounted on the top wall (110) of the cylinder and are spaced apart along the radial direction of the cylinder.

8. The power generation system according to claim 5, characterized in that: The heat exchanger (500) further comprises an anode heat exchanger (520) for exchanging heat of the anode gas, wherein the anode heat exchanger (520) is located below the bottom of the bottom wall (120) of the cylinder.

9. The power generation system according to claim 8, characterized in that: The anode gas distribution pipeline (600) comprises an anode gas inlet main pipe section (610) and an anode gas outlet main pipe section (620) extending from the anode heat exchanger (520) and coiled below the bottom of the bottom wall (120) of the cylinder body, and a plurality of anode gas inlet branch pipe sections (630) corresponding one-to-one to the battery stack unit group (300) are extended from the anode gas inlet main pipe section (610), and a plurality of anode gas outlet branch pipe sections (640) corresponding one-to-one to the battery stack unit group (300) are extended from the anode gas outlet main pipe section (620).

10. The power generation system according to claim 7, characterized in that: The cathode gas inlet chamber (710) is formed in a hollow cavity of the cylindrical wall (130), and the cathode exhaust gas outlet chamber (720) is located at the radial inner end of the stack unit ring. The cathode gas distribution duct also includes a cathode inlet and outlet pipe (730) extending from the cathode heat exchange air outlet of the cathode heat exchanger (510) and extending into the cathode gas inlet chamber (710), and a cathode exhaust gas inlet pipe (740) extending from the cathode heat exchange exhaust gas inlet of the cathode heat exchanger (510) and extending to the cathode exhaust gas outlet chamber (720).

11. The power generation system according to claim 10, characterized in that: The cyclone gas collecting cylinder (9) comprises a cylinder peripheral wall and a cyclone cylinder cavity defined by the cylinder peripheral wall, and the cylinder peripheral wall is provided with a plurality of cyclone air inlets (4) distributed at intervals along the circumferential direction and used for introducing cathode tail gas into the cyclone cylinder cavity.

12. The power generation system according to claim 2, characterized in that: The power generation system further comprises a plurality of power extraction lugs (2) extending from the bottom of the cylinder bottom wall (120) and corresponding one-to-one to the battery stack unit groups (300).

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