Tail gas combustion device

Abstract

The invention discloses a tail gas combustion device and belongs to the technical field of fuel cells, the tail gas combustion device is used for a solid-state fuel cell, the tail gas combustion device comprises a shell, a ventilation grid and an ignition device, the shell is provided with a first channel and a second channel, the first channel is suitable for being communicated with an anode tail gas outlet of the solid-state fuel cell, and the second channel is suitable for being communicated with an anode tail gas outlet of the solid-state fuel cell; the second channel is suitable for being communicated with a cathode tail gas outlet of the solid-state fuel cell, the ventilation grid divides the second channel into a gas inlet space and a combustion space, the ventilation grid is provided with a ventilation hole and a connecting channel, and the ignition device is at least partially arranged in the combustion space and used for igniting gas in the combustion space. The tail gas combustion device can purify tail gas of the solid-state fuel cell, cathode tail gas and anode tail gas of the solid-state fuel cell can be sufficiently mixed at the vent holes of the vent grid and then ignited by the ignition device in the combustion space, so that pollutants in the anode tail gas are eliminated, and emission of the pollutants is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a tail gas combustion device. Background Art

[0002] A solid-state fuel cell (SOFC) is an all-solid-state chemical power generation device that directly converts the chemical energy stored in fuel and oxidant into electrical energy in an efficient and environmentally friendly manner at medium to high temperatures. However, solid-state fuel cells produce a large amount of exhaust gas when in use.

[0003] In related technologies, the exhaust gas of solid-state fuel cells generally requires the use of precious metal catalysts. Precious metal catalysts are expensive and have high requirements for temperature and other conditions. In addition, a certain amount of fuel remains in the exhaust gas of solid-state fuel cells. This part of the fuel is not fully utilized, and the fuel discharged into the atmosphere will also pollute the air. Summary of the invention

[0004] The present invention aims to solve at least one of the above technical problems in the prior art to a certain extent. To this end, the present invention provides an exhaust gas combustion device, which can reduce the emission of harmful substances in the exhaust gas of a solid fuel cell.

[0005] According to an embodiment of the present invention, an exhaust gas combustion device is used for a solid-state fuel cell, and the exhaust gas combustion device includes: a shell, the shell having a first channel and a second channel, the first channel is suitable for being connected to an anode exhaust gas outlet of the solid-state fuel cell, and the second channel is suitable for being connected to a cathode exhaust gas outlet of the solid-state fuel cell; a ventilation grille, the ventilation grille is at least partially arranged in the second channel, the ventilation grille divides the second channel into an air intake space and a combustion space, in the gas flow direction in the second channel, the air intake space is located upstream of the combustion space, the ventilation grille has a ventilation hole and a connecting channel, the ventilation hole connects the air intake space and the combustion space, and the connecting channel connects the first channel and the ventilation hole; an ignition device, the ignition device is at least partially arranged in the combustion space, and the ignition device is used to ignite the gas in the combustion space.

[0006] According to the exhaust gas combustion device of the embodiment of the present invention, the exhaust gas combustion device can purify and process the exhaust gas of the solid-state fuel cell. The cathode exhaust gas and the anode exhaust gas of the solid-state fuel cell can be fully mixed at the ventilation holes of the ventilation grille and then ignited by the ignition device in the combustion space to eliminate pollutants in the anode exhaust gas and reduce the emission of pollutants.

[0007] According to some embodiments of the present invention, the number of the vents and the connecting channels are both multiple, the connecting channel has an air inlet and at least one air outlet, the air inlet is connected to the first channel, and each of the vents is connected to at least one air outlet.

[0008] According to some embodiments of the present invention, an axis of the vent hole is parallel to a gas flow direction in the second channel, and an axis of the gas outlet hole is perpendicular to the axis of the vent hole.

[0009] According to some embodiments of the present invention, the flow area of ​​the vent hole is S1, and the flow area of ​​the outlet hole is S2, satisfying the relationship: 5S2≤S1≤8S2.

[0010] According to some embodiments of the present invention, the vent hole is configured as an arched hole, and the air outlet hole is arranged opposite to the arch of the vent hole.

[0011] According to some embodiments of the present invention, the combustion space is in thermal communication with the solid-state fuel cell.

[0012] According to some embodiments of the present invention, the shell further has a third channel, one end of the third channel is suitable for communicating with the cathode tail gas outlet, and the other end of the third channel is communicated with the combustion space.

[0013] According to some embodiments of the present invention, the exhaust gas combustion device also includes a mixing tube, which is at least partially arranged in the combustion space and located downstream of the ignition device. The mixing tube has a plurality of mixing holes, and the third channel is connected to the combustion space through the mixing holes of the mixing tube.

[0014] According to some embodiments of the present invention, the tail gas combustion device further comprises: a damper valve, the damper valve being arranged on the shell, the damper valve being used to adjust the gas flow rate from the cathode tail gas outlet to the second channel and the third channel.

[0015] According to some embodiments of the present invention, the exhaust gas combustion device further comprises: a rectifying plate, wherein the rectifying plate is arranged in the air intake space, and the rectifying plate has a plurality of rectifying holes.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of an exhaust gas combustion device according to an embodiment of the present invention Figure 1 ;

[0018] Figure 2Schematic diagram of an exhaust gas combustion device according to an embodiment of the present invention Figure 2 ;

[0019] Figure 3 The internal structure of the tail gas combustion device according to the embodiment of the present invention is shown in FIG. Figure 1 ;

[0020] Figure 4 The internal structure of the tail gas combustion device according to the embodiment of the present invention is shown in FIG. Figure 2 ;

[0021] Figure 5 Schematic diagram of the internal structure of the tail gas combustion device according to an embodiment of the present invention Figure 3 ;

[0022] Figure 6 yes Figure 5 Section view at AA;

[0023] Figure 7 yes Figure 5 Cross-section at BB.

[0024] Reference numerals:

[0025] Shell 1; first channel 11; second channel 12; third channel 13;

[0026] Ventilation grille 2; vent hole 21; connecting channel 22; air inlet 221; air outlet 222;

[0027] Ignition device 3; air intake space 4; combustion space 5;

[0028] Mixing tube 6; mixing hole 61;

[0029] Rectifier plate 7; Rectifier hole 71;

[0030] Exhaust gas combustion device 100. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0032] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] The tail gas combustion device 100 according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0036] Reference Figure 1-Figure 6 As shown, according to an embodiment of the present invention, the exhaust gas combustion device 100 is used for a solid-state fuel cell. The exhaust gas combustion device 100 includes: a shell 1, an air grille 2 and an ignition device 3. The shell 1 has a first channel 11 and a second channel 12. The first channel 11 is suitable for being connected to the anode exhaust gas outlet of the solid-state fuel cell, and the second channel 12 is suitable for being connected to the cathode exhaust gas outlet of the solid-state fuel cell. The air grille 2 is at least partially arranged in the second channel 12. The air grille 2 divides the second channel 12 into an air intake space 4 and a combustion space 5. In the gas flow direction in the second channel 12, the air intake space 4 is located upstream of the combustion space 5. The air grille 2 has an air vent 21 and a connecting channel 22. The air vent 21 connects the air intake space 4 and the combustion space 5. The connecting channel 22 connects the first channel 11 and the air vent 21. The ignition device 3 is at least partially arranged in the combustion space 5. The ignition device 3 is used to ignite the gas in the combustion space 5.

[0037] Among them, the anode tail gas outlet of the solid-state fuel cell can discharge the anode tail gas, and the main components of the anode tail gas are H2, CO, and CO2. The cathode tail gas outlet of the solid-state fuel cell can discharge the cathode tail gas, and the main components of the cathode tail gas are N2, O2, H2O and CO2. The anode tail gas and the cathode tail gas can be fully mixed in the tail gas combustion device 100 and then ignited. That is to say, the anode tail gas is the fuel and the cathode tail gas is the combustion support. The cathode tail gas can provide the required oxygen for the combustion of the anode tail gas, so that the anode tail gas and the cathode tail gas can be fully and stably burned after mixing to eliminate harmful substances in the tail gas.

[0038] Specifically, in the exhaust gas combustion device 100, the second channel 12 of the shell 1 is connected to the cathode exhaust gas outlet of the solid-state fuel cell, and the cathode exhaust gas can flow into the second channel 12. The ventilation grille 2 is at least partially arranged in the second channel 12. The ventilation grille 2 can be fixed to the inner wall of the second channel 12 by means of clamping, welding, fastener connection, etc. The ventilation grille 2 divides the second channel 12 in the shell 1 into an air intake space 4 and a combustion space 5. In the gas flow direction in the second channel 12, the air intake space 4 is located upstream of the combustion space 5. The ventilation grille 2 has a ventilation hole 21, and the ventilation hole 21 connects the air intake space 4 and the combustion space 5. That is to say, the cathode exhaust gas discharged from the cathode exhaust gas outlet of the solid-state fuel cell has a flow path after entering the second channel 12: air intake space 4, ventilation hole 21, combustion space 5, that is, the gas in the second channel 12 is in Figure 1 Flows from front to back.

[0039] The first channel 11 of the shell 1 is connected to the anode tail gas outlet of the solid-state fuel cell, and the anode tail gas can flow into the first channel 11. The ventilation grille 2 has a connecting channel 22, and the connecting channel 22 connects the first channel 11 and the vent 21. That is to say, the anode tail gas discharged from the anode tail gas outlet of the solid-state fuel cell, after entering the tail gas combustion device 100, has a flow path of: the first channel 11, the connecting channel 22, the vent 21, and the combustion space 5, wherein, when the anode tail gas flows into the vent 21, it can be fully mixed with the cathode tail gas flowing through the vent 21 toward the combustion space 5.

[0040] The ignition device 3 is at least partially disposed in the combustion space 5. The ignition device 3 can spray flames into the combustion space 5 to ignite the mixed anode tail gas and cathode tail gas in the combustion space 5. The cathode tail gas can provide the required oxygen for the combustion of the anode tail gas, so that the anode tail gas and the cathode tail gas can be mixed and burn fully and stably in the combustion space 5, so that the combustible components in the anode tail gas are converted into water and carbon dioxide, thereby reducing the emission of harmful gases.

[0041] In the above embodiment, the exhaust gas combustion device 100 can purify and process the exhaust gas of the solid-state fuel cell. The cathode exhaust gas and the anode exhaust gas of the solid-state fuel cell can be fully mixed at the ventilation holes 21 of the ventilation grille 2 and then ignited by the ignition device 3 in the combustion space 5 to eliminate pollutants in the anode exhaust gas and reduce the emission of pollutants.

[0042] In some embodiments of the present invention, Figure 2-Figure 6 As shown, there are multiple vent holes 21 and connecting channels 22 . The connecting channel 22 has an air inlet 221 and at least one air outlet 222 . The air inlet 221 is connected to the first channel 11 , and each vent hole 21 is connected to at least one air outlet 222 .

[0043] Among them, the number of connecting channels 22 is multiple, and the number of connecting channels 22 can be but not limited to 2, 3, 4, etc., the number of vents 21 is multiple, and the number of vents 21 can be but not limited to 10, 30, 50, etc., each connecting channel 22 has an air inlet 221 and at least one air outlet 222, the air inlet 221 connects the first channel 11 and the connecting channel 22, the air outlet 222 connects the connecting channel 22 and the vent 21, each air outlet 222 is connected to the vent 21, and each air outlet 21 is connected to at least one air outlet 222, so that a mixed gas of anode tail gas and cathode tail gas is formed at each vent 21, so that the anode tail gas and the cathode tail gas can be fully diffused and mixed, and the multiple connecting channels 22 and the multiple air vents 21 can make the anode tail gas and the cathode tail gas in the combustion space 5 mixed and distributed more evenly, so that the anode tail gas and the cathode tail gas can be more fully and stably burned in the combustion space 5 to reduce the pollutant content in the tail gas.

[0044] As a specific embodiment of the present application, Figure 4 and Figure 6 As shown, the number of the connecting channels 22 may be four, and the four connecting channels 22 are arranged at intervals along the left-right direction. The number of the vent holes 21 is 72, and each connecting channel 22 is connected to 18 vent holes 21.

[0045] In some embodiments of the present invention, Figure 3 As shown, the axis of the vent hole 21 is parallel to the gas flow direction in the second channel 12 , and the axis of the gas outlet hole 222 is perpendicular to the axis of the vent hole 21 .

[0046] Among them, the anode exhaust gas flowing into the connecting channel 22 from the first channel 11 can flow into the vent 21 through the outlet hole 222, and the cathode exhaust gas in the second channel 12 can flow through the vent 21 in the front-to-back direction. The flow directions of the anode exhaust gas and the cathode exhaust gas at the vent 21 are perpendicular, that is, the anode exhaust gas flows into the vent 21 in the left-right direction, and the anode exhaust gas and the cathode exhaust gas form high-speed cross jets at the vent 21. The anode exhaust gas and the cathode exhaust gas can form a backflow vortex in the vent 21, which can make the anode exhaust gas and the cathode exhaust gas quickly and fully diffuse and mix to form a uniform mixed gas, so that the anode exhaust gas and the cathode exhaust gas can be more fully burned in the combustion space 5.

[0047] In some embodiments of the present invention, the flow area of ​​the vent hole 21 is S1, and the flow area of ​​the outlet hole 222 is S2, satisfying the relationship: 5S2≤S1≤8S2.

[0048] Among them, the flow area S1 of the vent 21 is 5 to 8 times the flow area S2 of the outlet hole 222, and S1 can be equal to 5S2, 6S2, 8S2, etc., so that the cathode exhaust gas flow through the vent 21 is 5 to 8 times the anode exhaust gas flow through the outlet hole 222, so that the oxygen content in the cathode exhaust gas and the fuel content in the anode exhaust gas can be fully mixed according to the designed equivalence ratio, so that the anode exhaust gas and the cathode exhaust gas can be burned more fully, so as to improve the utilization rate of the fuel in the anode exhaust gas and save energy.

[0049] As some embodiments of the present invention, the aperture of the vent hole 21 may be 2 mm-4 mm, and the aperture of the vent hole 21 may be but not limited to 2 mm, 3 mm, 4 mm, etc. For example, the aperture of the vent hole 21 may be 2 mm, and the flow area of ​​the vent hole 21 may be 4πmm 2 , the flow area of ​​the air outlet 222 can be 0.6mm 2 Alternatively, the aperture of the vent hole 21 may be 3 mm, and the flow area of ​​the vent hole 21 may be 9πmm 2 The flow area of ​​the air outlet 222 can be 1.5 mm 2 Alternatively, the aperture of the vent hole 21 may be 4 mm, and the flow area of ​​the vent hole 21 may be 16πmm 2 The flow area of ​​the air outlet 222 can be 2.5 mm 2 Such a setting can control the design equivalence ratio of the cathode tail gas and the anode tail gas, and can make the flow rate of the cathode tail gas flowing through the vent 21 greater than 80m / s, so that the anode tail gas and the cathode tail gas can be burned more completely, so as to improve the utilization rate of the fuel in the anode tail gas and save energy.

[0050] In some embodiments of the present invention, Figure 2-Figure 4 and Figure 6As shown, the ventilation hole 21 is configured as an arched hole, and the air outlet hole 222 is arranged opposite to the arch of the ventilation hole 21 .

[0051] Among them, the anode exhaust gas is sprayed directly at the dome of the air vent 21. The anode exhaust gas is sprayed to the dome and diffuses to both sides along the arched inner wall of the arched hole. The arched inner wall can reduce the speed loss of the anode exhaust gas, and can reduce the kinetic energy loss of the anode exhaust gas, so that the anode exhaust gas can be better mixed with the cathode exhaust gas to form a high-speed reflux vortex, and the strength of the reflux vortex can be enhanced, so that the anode exhaust gas and the cathode exhaust gas are more evenly distributed in the combustion space 5, which is beneficial to more stable and sufficient combustion of the anode exhaust gas and the cathode exhaust gas in the combustion space 5.

[0052] In some embodiments of the present invention, the combustion space 5 is in thermal communication with a solid-state fuel cell.

[0053] Among them, the anode exhaust gas and the cathode exhaust gas are burned in the combustion space 5 to form flue gas with a higher temperature. The combustion space 5 is thermally connected to the solid-state fuel cell, that is, the flue gas generated after combustion can be heat exchanged with the solid-state fuel cell to increase the temperature of the solid-state fuel cell. The exhaust gas combustion device 100 can start working at room temperature to provide the required heat for the solid-state fuel cell startup phase. At the same time, using the energy of the exhaust gas to provide heat for the solid-state fuel cell can increase energy utilization, and the solid-state fuel cell exhaust gas can be efficiently and stably recovered to reduce energy waste, which is beneficial to reducing the operating cost of the solid-state fuel cell.

[0054] As some embodiments of the present invention, the flue gas generated after combustion can directly flow into the fuel cell to provide heat for the fuel cell.

[0055] As other embodiments of the present invention, the fuel cell system can be provided with a coolant. The flue gas generated after the combustion of the cathode exhaust gas and the anode exhaust gas in the combustion space 5 can heat the coolant of the fuel cell system. The heated coolant can flow into the coolant heat dissipation channel of the battery to heat the fuel cell, thereby achieving the effect of thermal connection between the combustion space 5 and the solid-state fuel cell.

[0056] In some embodiments of the present invention, Figure 1-Figure 4 , Figure 6 and Figure 7 As shown, the shell 1 further has a third channel 13 , one end of the third channel 13 is suitable for communicating with the cathode tail gas outlet, and the other end of the third channel 13 is communicated with the combustion space 5 .

[0057] Part of the cathode tail gas discharged from the solid fuel cell will enter the third channel 13, and this part of the cathode tail gas can enter the combustion space 5 through the third channel 13. This part of the cathode tail gas is mixed with the flue gas generated after combustion in the combustion space 5 to reduce the temperature of the flue gas generated after combustion, so that the temperature after the flue gas and the cathode gas are mixed is suitable for heating the solid fuel cell, so as to control the temperature of the solid fuel cell and avoid overheating of the solid fuel cell. At the same time, by allowing part of the cathode tail gas discharged from the solid fuel cell to enter the third channel 13, the flow rate of the cathode tail gas flowing into the second channel 12 can be reduced to avoid the flow rate of the cathode tail gas flowing into the second channel 12 being too high, thereby reducing the probability of blowout in the combustion space 5.

[0058] As a specific embodiment of the present invention, Figure 1 , Figure 2 , Figure 4 , Figure 6 and Figure 7 As shown, there is a third channel 13 at the left and right ends of the exhaust gas combustion device 100. The third channel 13 can also play a role of heat insulation. The third channel 13 can prevent the exhaust gas combustion device 100 from being overheated and affecting other components. In addition, part of the structure of the ignition device 3 can be located in the third channel 13. The third channel 13 can protect the ignition device 3. The cathode exhaust gas with a lower temperature in the third channel 13 can be used to cool the ignition device 3, which can reduce the probability of the ignition device 3 being damaged due to excessive temperature.

[0059] As other embodiments of the present invention, a third channel 13 may be provided at each of the upper end, lower end, left end and right end of the exhaust gas combustion device 100. Multiple third channels 13 may more significantly reduce the flow rate of the cathode exhaust gas in the second channel 12. Multiple third channels 13 may make the exhaust gas combustion device 100 have a better thermal insulation effect.

[0060] In some embodiments of the present invention, Figure 5 and Figure 7 As shown, the exhaust gas combustion device 100 also includes a mixing tube 6, which is at least partially arranged in the combustion space 5 and located downstream of the ignition device 3. The mixing tube 6 has a plurality of mixing holes 61, and the third channel 13 is connected to the combustion space 5 through the mixing holes 61 of the mixing tube 6.

[0061] Among them, at least part of the structure of the mixing tube 6 is arranged in the combustion space 5. As some embodiments of the present invention, the mixing tube 6 can be fixed to the shell 1 by bolt connection, clamp connection or welding connection. Part of the cathode exhaust gas discharged from the solid-state fuel cell can enter the mixing tube 6 through the third channel 13. The mixing tube 6 has a plurality of mixing holes 61. The plurality of mixing holes 61 can be arranged at intervals in the axial direction and the circumferential direction of the mixing tube 6. The cathode exhaust gas in the mixing tube 6 can be radially ejected along the mixing tube 6 to the combustion space 5. The cathode exhaust gas radially ejected along the mixing tube 6 can be mixed with the flue gas generated after combustion in the combustion space 5 to uniformly reduce the temperature of the flue gas generated after combustion, so that the flue gas generated after combustion and the gas mixed with the cathode gas can exchange heat with the solid-state fuel cell at a lower temperature to avoid damaging the solid-state fuel cell due to excessive temperature.

[0062] As some embodiments of the present invention, Figure 5 and Figure 7 As shown, there may be multiple mixing tubes 6, and the cathode exhaust gas may flow into the combustion space 5 through the multiple mixing tubes 6, and the multiple mixing tubes 6 may be arranged in sequence in the up and down direction. As a specific embodiment of the present invention, there may be three mixing tubes 6. By providing three mixing tubes 6, the cathode exhaust gas passing through the third channel 13 and the mixing tubes 6 in sequence may flow into and be dispersed into the combustion space 5 more evenly, so as to more effectively and evenly reduce the temperature of the flue gas generated after combustion, that is, the temperature of the gas after the flue gas generated after combustion and the cathode gas are mixed is evenly distributed, and the difference between the highest temperature and the lowest temperature may be less than 20°C, so as to reduce the temperature difference of the gas after the flue gas generated after combustion and the cathode gas are mixed.

[0063] As some embodiments of the present invention, the aperture of the mixing hole 61 may be 2mm-5mm, and the aperture of the ventilation hole 21 may be but not limited to 2mm, 3mm, 5mm, etc. Such a setting can control the flow rate of the cathode exhaust gas flowing out of each mixing hole 61, so that the flow rate of the cathode exhaust gas ejected from multiple mixing holes 61 is uniform, so that the cathode exhaust gas ejected from the mixing hole 61 can be more evenly mixed with the flue gas generated after combustion and uniformly reduce the temperature of the flue gas generated after combustion.

[0064] As some embodiments of the present invention, Figure 5-Figure 7 As shown, the ignition device 3 can be an ignition gun, and 2, 3 or 4 ignition guns can be provided, and multiple ignition guns are arranged at intervals. The ignition device 3 is at least partially arranged in the combustion space 5. The ignition device 3 can have a fuel pipe and an air pipe. The fuel pipe is used to provide fuel to the ignition device 3, and the air pipe is used to provide an oxidant to the ignition device 3. As an embodiment of the present invention, the fuel in the fuel pipe can be derived from a solid fuel cell. The ignition device 3 ignites the fuel in the fuel pipe to spray a flame into the combustion space 5 to ignite the anode tail gas and the cathode tail gas in the combustion space 5.

[0065] In some embodiments of the present invention, the tail gas combustion device 100 further includes: a damper valve, which is disposed on the shell 1 and is used to adjust the gas flow from the cathode tail gas outlet to the second channel 12 and the third channel 13 .

[0066] Among them, in the process of the cathode exhaust gas flowing from the cathode exhaust gas outlet of the solid-state fuel cell to the second channel 12 and the third channel 13, the flow rate of the cathode exhaust gas will be regulated by the baffle valve. The baffle valve can adjust its own structure to regulate the flow rate of the cathode exhaust gas through the baffle valve, and the baffle valve can appropriately reduce the flow rate of the cathode exhaust gas entering the second channel 12 to reduce the flow rate of the cathode exhaust gas flowing into the second channel 12, thereby reducing the probability of blow-out in the combustion space 5.

[0067] As some embodiments of the present invention, the baffle valve can be a louver type baffle valve, which can adjust its own blade position as needed to adjust the flow rate of cathode exhaust gas. The louver type baffle valve has a simple structure, is convenient for controlling the flow rate of cathode exhaust gas, and is easy to replace or repair.

[0068] In some embodiments of the present invention, Figure 1 , Figure 3 and Figure 5 As shown, the exhaust gas combustion device 100 further includes: a rectifying plate 7 , which is disposed in the air intake space 4 , and has a plurality of rectifying holes 71 .

[0069] Among them, after the cathode exhaust gas passes through the baffle valve, the cathode exhaust gas will flow through the rectifier plate 7. The rectifier plate 7 has a plurality of rectifying holes 71. The plurality of rectifying holes 71 can be evenly distributed on the rectifier plate 7. The cathode exhaust gas can flow through the plurality of rectifying holes 71. The rectifier plate 7 can make the cathode exhaust gas passing through more uniform. Moreover, the rectifier plate 7 can make the flow direction of the cathode exhaust gas passing through the rectifier plate 7 consistent with the normal direction of the plane where the rectifier plate 7 is located, so that the cathode exhaust gas passing through the rectifier plate 7 can be evenly distributed in the air intake space 4, so that the cathode exhaust gas can evenly flow through the vents 21 and intersect with the anode exhaust gas to be more evenly mixed.

[0070] In the related technology, the exhaust gas of solid-state fuel cells has low temperature, high humidity and is difficult to burn. Generally, precious metal catalysis is required to reduce the pollutant content in the exhaust gas of solid-state fuel cells. The method of using precious metal catalysis to reduce the exhaust pollutants of solid-state fuel cells is relatively expensive and has high requirements for the reaction temperature. When the temperature is lower than 450°C, the activity of the precious metal catalyst is low and the exhaust gas treatment effect is poor.

[0071] The exhaust gas combustion device 100 proposed in the present invention can achieve the effect of reducing exhaust pollutants of solid fuel cells without using precious metal catalysts, so as to achieve a more economical low calorific value exhaust gas treatment effect.

[0072] According to the tail gas combustion device 100 of the embodiment of the present invention, the cathode tail gas outlet of the solid fuel cell can discharge the cathode tail gas. After the cathode tail gas is diverted by the baffle valve, a part of the cathode tail gas can flow through the air intake space 4, the vent 21, and the combustion space 5 of the second channel 12 in sequence, and is uniformly rectified by the multiple rectifying pores 71 of the rectifying plate 7 at the point where it flows through the air intake space 4. The anode tail gas outlet of the solid fuel cell can discharge the anode tail gas. The anode tail gas can flow through the first channel 11, the connecting channel 22, the vent 21, and the combustion space 5 in sequence. The anode tail gas and the cathode tail gas can generate high-speed cross jets at the vent 21 to form a reflux vortex, so that the anode tail gas and the cathode tail gas meet and fully mix to form a combustible mixed gas, which can be stably burned in the combustion space 5 by the flame sprayed by the ignition device 3, and finally form flue gas with a higher temperature. At the same time, another part of the cathode tail gas diverted by the flapper valve can flow through the third channel 13, the mixing tube 6 and enter the combustion space 5 in sequence, and this part of the cathode tail gas can be mixed with the flue gas with a higher combustion temperature to reduce the temperature of the flue gas, and the flue gas mixed with the cathode tail gas can be thermally connected to the solid fuel cell to provide heat for the startup phase of the solid fuel cell. The tail gas combustion device 100 proposed by the present invention can reduce pollutants in the tail gas, and the flue gas can provide heat for the fuel cell, which can reduce the operating cost of the fuel cell and reduce energy waste.

[0073] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0074] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An exhaust gas combustion device for a solid fuel cell, characterized in that: The tail gas combustion device comprises: A housing (1), the housing (1) having a first channel (11) and a second channel (12), the first channel (11) being adapted to communicate with an anode tail gas outlet of the solid-state fuel cell, and the second channel (12) being adapted to communicate with a cathode tail gas outlet of the solid-state fuel cell; a ventilation grille (2), wherein the ventilation grille (2) is at least partially disposed in the second channel (12), the ventilation grille (2) divides the second channel (12) into an air intake space (4) and a combustion space (5), and in the gas flow direction in the second channel (12), the air intake space (4) is located upstream of the combustion space (5), the ventilation grille (2) has a ventilation hole (21) and a connecting channel (22), the ventilation hole (21) connects the air intake space (4) and the combustion space (5), and the connecting channel (22) connects the first channel (11) and the ventilation hole (21); An ignition device (3), wherein the ignition device (3) is at least partially disposed in the combustion space (5), and the ignition device (3) is used to ignite the gas in the combustion space (5).

2. The tail gas combustion device according to claim 1, characterized in that: The number of the ventilation holes (21) and the connecting channel (22) is multiple, the connecting channel (22) has an air inlet (221) and at least one air outlet (222), the air inlet (221) is connected to the first channel (11), and each of the ventilation holes (21) is connected to at least one air outlet (222).

3. The tail gas combustion device according to claim 2, characterized in that: The axis of the vent hole (21) is parallel to the gas flow direction in the second channel (12), and the axis of the gas outlet hole (222) is perpendicular to the axis of the vent hole (21).

4. The tail gas combustion device according to claim 2, characterized in that: The flow area of ​​the vent hole (21) is S1, and the flow area of ​​the outlet hole (222) is S2, satisfying the relationship: 5S2≤S1≤8S2.

5. The tail gas combustion device according to claim 2, characterized in that: The vent hole (21) is configured as an arched hole, and the air outlet hole (222) is arranged opposite to the arch of the vent hole (21).

6. The tail gas combustion device according to any one of claims 1 to 5, characterized in that: The combustion space (5) is thermally connected to the solid fuel cell.

7. The tail gas combustion device according to claim 6, characterized in that: The shell (1) further comprises a third channel (13), one end of the third channel (13) is adapted to be in communication with the cathode tail gas outlet, and the other end of the third channel (13) is in communication with the combustion space (5).

8. The tail gas combustion device according to claim 7, characterized in that: The invention also comprises a mixing tube (6), wherein the mixing tube (6) is at least partially arranged in the combustion space (5) and is located downstream of the ignition device (3), the mixing tube (6) has a plurality of mixing holes (61), and the third channel (13) is connected to the combustion space (5) through the mixing holes (61) of the mixing tube (6).

9. The tail gas combustion device according to claim 7, characterized in that: Also includes: A baffle valve is provided on the housing (1), and is used to adjust the gas flow rate from the cathode tail gas outlet to the second channel (12) and the third channel (13).

10. The tail gas combustion device according to claim 9, characterized in that: Also includes: A rectifying plate (7), wherein the rectifying plate (7) is arranged in the air intake space (4), and the rectifying plate (7) has a plurality of rectifying holes (71).

Images