A burner and a combustion device

Abstract

This application relates to the field of burners, and more particularly, to a burner and a combustion device. The burner includes a mixed gas delivery pipe, a first combustion assembly, a housing, a fuel gas delivery pipe, an auxiliary combustion gas delivery pipe, and a second combustion assembly. The first combustion assembly and the second combustion assembly are both located inside the housing. The first combustion assembly includes a porous medium combustion layer; both the auxiliary combustion gas delivery pipe and the fuel gas delivery pipe are connected to the second combustion assembly; the second combustion assembly is located below the flue gas of the porous medium combustion layer, so that the flue gas of the porous medium combustion layer can flow through the second combustion assembly. The unburned flue gas after combustion in the porous medium combustion layer flows to the area where the second combustion assembly is located under the guidance of the housing and continues to burn, enabling the burner to have the advantages of complete combustion and uniform heat dissipation; in the combustion area of the second combustion assembly, due to the increase in air temperature, a local high pressure is formed, causing the flue gas to be entrained and mixed in this area, further achieving complete combustion while reducing the released flame.

Description

Technical Field

[0001] This application relates to the field of burners, and more particularly, to a burner and a combustion device. Background Art

[0002] Porous medium combustion is a combustion method in which a porous medium is added to a burner. Due to the existence of three heat transfer methods, namely convection, heat conduction, and radiation, in the burner with the added porous medium, the temperature in the combustion zone tends to be uniform, maintaining a relatively stable temperature gradient. Porous medium combustion has the advantages of high combustion rate, good combustion stability, good gas adaptability, and low pollutant emissions in flue gas.

[0003] However, there is a problem of incomplete combustion in the process of burning the porous medium combustion layer. Summary of the Invention

[0004] The purpose of the embodiments of this application is to provide a burner and a combustion device, aiming to improve the problem of incomplete combustion existing in the existing burner during the combustion process.

[0005] This application provides a burner, which includes a mixed gas delivery pipe, a first combustion assembly, a housing, a gas delivery pipe, an auxiliary gas delivery pipe, and a second combustion assembly. The mixed gas delivery pipe is used to deliver the mixture of gas and auxiliary gas; the first combustion assembly is located inside the housing, and the first combustion assembly includes a porous medium combustion layer, and the porous medium combustion layer is connected to the mixed gas delivery pipe; the gas delivery pipe is used to deliver gas; the auxiliary gas delivery pipe is used to deliver auxiliary gas; the second combustion assembly is located inside the housing; both the auxiliary gas delivery pipe and the gas delivery pipe are connected to the second combustion assembly; the second combustion assembly is located below the porous medium combustion layer, so that the flue gas of the porous medium combustion layer can flow through the second combustion assembly.

[0006] After the mixed gas burns in the porous medium combustion layer, it has the advantages of good combustion stability, good gas adaptability, uniform heat dissipation, low nitrogen oxides in flue gas, and few flames; the flue gas after combustion of the porous medium combustion layer contains unburned gas, and this gas flows to the area where the second combustion assembly is located under the guidance of the housing. The raw gas in the combustion area of the second combustion assembly is gas and auxiliary gas, and the aforementioned unburned gas burns more fully in this combustion area; in the combustion area of the second combustion assembly, the flue gas in the first combustion area is reheated, and due to the increase in air temperature, a local high pressure is formed, so that the flue gas is entrained and mixed in this combustion area, further burning completely while reducing the released flames, making it have the characteristics of no flame or few flames.

[0007] In some embodiments of this application, the first combustion assembly further includes a perforated plate, one end of the perforated plate is communicated with the mixed gas delivery pipe, and the other end is communicated with the porous medium combustion layer.

[0008] In some embodiments of the present application, the pore area of the cross-section of the porous plate is smaller than the cross-sectional area of the mixed gas delivery pipe.

[0009] In some embodiments of the present application, the first combustion assembly further includes a heat preservation shell, and the porous plate and the porous medium combustion layer are both located inside the heat preservation shell.

[0010] In some embodiments of the present application, the pore diameter of the porous plate is less than or equal to 1.2 mm.

[0011] In some embodiments of the present application, the burner further includes a gas mixing chamber connected to the outer shell, the mixed gas delivery pipe and the porous medium combustion layer are both communicated with the gas mixing chamber; a gas distribution plate is arranged inside the gas mixing chamber.

[0012] In some embodiments of the present application, the combustion-supporting gas delivery pipe is sleeved outside the fuel gas delivery pipe;

[0013] The porous medium combustion layer surrounds the combustion-supporting gas delivery pipe.

[0014] In some embodiments of the present application, the fuel gas delivery pipe is sleeved outside the combustion-supporting gas delivery pipe;

[0015] The porous medium combustion layer surrounds the fuel gas delivery pipe.

[0016] In some embodiments of the present application, the burner further includes a sleeve; the second combustion assembly includes a fuel gas nozzle and a swirl vane; the swirl vane is arranged at the outlet of the fuel gas delivery pipe, and the fuel gas delivery pipe and the combustion-supporting gas delivery pipe are both connected to the fuel gas nozzle; the fuel gas nozzle is located inside the sleeve.

[0017] The present application also provides a combustion device, which includes a gas supply assembly and the above-mentioned burner connected to the gas supply assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0019] Figure 1 It shows a schematic structural diagram of the burner provided by the embodiment of the present application from the first perspective;

[0020] Figure 2 It shows a schematic structural diagram of the burner provided by the embodiment of the present application from the second perspective;

[0021] Figure 3 It shows a schematic structural diagram of the third perspective of the burner provided by the embodiment of the present application;

[0022] Figure 4 It shows a cross-sectional view of the burner provided by the embodiment of the present application along the first section;

[0023] Figure 5 It shows a cross-sectional view of the burner provided by the embodiment of the present application along the second section;

[0024] Figure 6 It shows Figure 4 an enlarged view of part A in

[0025] Icon: 100 - Burner; 110 - First combustion assembly; 111 - Heat preservation shell; 112 - Porous medium combustion layer; 113 - Porous plate; 120 - Second combustion assembly; 121 - Gas spray head; 122 - Swirl vane; 123 - Igniter; 130 - Mixed gas delivery pipe; 140 - Outer shell; 141 - Flue gas outlet; 150 - Gas delivery pipe; 160 - Combustion-supporting gas delivery pipe; 170 - Gas mixing chamber; 171 - Gas distribution plate; 180 - Sleeve. Detailed implementation manners

[0026] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts fall within the scope of protection of the present application.

[0028] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0029] In the description of the embodiments of the present application, it should be understood that the orientation or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, or the orientation or positional relationships in which the products of this application are customarily placed during use, or the orientation or positional relationships commonly understood by those skilled in the art. These are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0030] In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0031] In the description of the embodiments of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "coupled" 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 or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0032] Embodiment

[0033] Figure 1 shows a schematic structural view of the burner 100 provided by the embodiment of the present application from the first perspective. Figure 2 shows a schematic structural view of the burner 100 provided by the embodiment of the present application from the second perspective. Figure 3 shows a schematic structural view of the burner 100 provided by the embodiment of the present application from the third perspective. Figure 4 shows a cross-sectional view of the burner 100 provided by the embodiment of the present application along the first section. Figure 5 shows a cross-sectional view of the burner 100 provided by the embodiment of the present application along the second section. Please refer to Figures 1 - 5 , this embodiment provides a burner 100; the burner 100 has two combustion components, a first combustion component 110 and a second combustion component 120, and the first combustion component 110 and the second combustion component 120 are supplied with gas by independent gas supply components.

[0034] Specifically, the burner 100 includes a first combustion assembly 110, a second combustion assembly 120, a mixed gas delivery pipe 130, a housing 140, a fuel gas delivery pipe 150, and an auxiliary fuel gas delivery pipe 160. The mixed gas delivery pipe 130 is connected to the first combustion assembly 110. Both the fuel gas delivery pipe 150 and the auxiliary fuel gas delivery pipe 160 are connected to the second combustion assembly 120. Both the first combustion assembly 110 and the second combustion assembly 120 are located inside the housing 140.

[0035] The mixed gas delivery pipe 130 is used to deliver the mixed gas of fuel gas and auxiliary fuel gas; the fuel gas delivery pipe 150 is used to deliver fuel gas; the auxiliary fuel gas delivery pipe 160 is used to deliver auxiliary fuel gas; in this application, the auxiliary fuel gas can be air, oxygen, etc., and the fuel gas can be natural gas. It should be noted that in this application, the types of auxiliary fuel gas and fuel gas are not limited.

[0036] In this application, the first combustion assembly 110 forms a combustion area, and the second combustion assembly 120 forms a combustion area; the flue gas after combustion of the first combustion assembly 110 can be re - burned after passing through the combustion area formed by the second combustion assembly 120.

[0037] Figure 6 Shows Figure 4 The enlarged view of part A in Figures 1 - 6 , the first combustion assembly 110 includes a heat - insulating shell 111, a porous - medium combustion layer 112, and a porous plate 113.

[0038] The porous - medium combustion layer 112 is connected to the porous plate 113, and the heat - insulating shell 111 surrounds the porous - medium combustion layer 112 and the porous plate 113; the mixed gas delivered by the mixed gas delivery pipe 130 is first divided into multiple airflows by the porous plate 113 and then flows to the porous - medium combustion layer 112, and burns after reaching the ignition point; after the combustible gas burns in the porous - medium combustion layer 112, its flue gas discharges along the inner wall of the housing 140 towards the opening (flue gas outlet 141) of the housing 140. The main function of the heat - insulating shell 111 is to prevent the heat of the porous - medium combustion layer 112 and the porous plate 113 from dissipating from the side, which can improve the utilization rate of heat. In this embodiment, the porous - medium combustion layer 112 is generally annular, and its combustion flame presents an annular distribution; the porous - medium combustion layer 112 is a silicon carbide porous ceramic medium burner, which has excellent high - temperature resistance. The material of the porous plate 113 is alumina; in some embodiments of this application, the pore diameter of the porous plate 113 is less than or equal to 1.2 mm. For example, its pore diameter can be 1.2 mm, 1 mm, 0.8 mm, 0.6 mm, etc. The pore diameter of the porous plate 113 is less than or equal to 1.2 mm, which is less than the quenching diameter of natural gas combustion, so that the porous plate 113 has the function of preventing flashback.

[0039] In this embodiment, the porous plate 113 has a cross-section along a direction perpendicular to the conveying direction of the mixed gas, and the sum of the pore areas of the aforementioned cross-section of the porous plate 113 is smaller than the cross-sectional area of the mixed gas conveying pipe 130; in other words, the sum of the areas of all the pores in the cross-section of the porous plate 113 along the direction perpendicular to the pore extension direction is smaller than the cross-sectional area of the mixed gas conveying pipe 130; since the sum of the pore areas of the porous plate 113 is smaller than the cross-sectional area of the mixed gas conveying pipe 130, after the gas enters the interior of the porous plate 113 from the mixed gas conveying pipe 130, the pressure increases, which can make the flow rate of the mixed gas entering each pore of the porous plate 113 consistent; thus, the heat dissipated from each part of the porous medium combustion layer 112 is relatively uniform.

[0040] The following gives examples of the parameters when the first combustion assembly 110 of the present application is in use:

[0041] The flow rate of the mixed gas inside the alumina porous plate 113 is greater than the combustion speed of natural gas. The flow rate of the mixed gas inside the pores of the alumina porous plate 113 should be greater than 3 m / s. For example, it can be 5 m / s, 6 m / s, etc., which can further reduce the risk of flashback of the alumina porous plate 113.

[0042] The mixed gas inside the mixed gas conveying pipe 130 ensures a relatively high excess air coefficient. Exemplarily, the excess air coefficient of the mixed gas inside the mixed gas conveying pipe 130 is 0.6 to 0.95. For example, it can be 0.6, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, etc. If the excess air coefficient is low, it will cause the combustion temperature inside the porous medium combustion layer 112 to decrease, and the combustion atmosphere will be a reducing atmosphere, resulting in the oxidation of the porous medium combustion layer 112, which will reduce its service life; at the same time, the low combustion temperature and reducing atmosphere will also lead to a relatively high emission of nitrogen oxides. Selecting a mixed gas with an excess air coefficient of 0.6 to 0.95 can effectively improve the aforementioned problems.

[0043] It should be noted that the above only gives some examples of the first combustion assembly 110 when in use, and does not limit that only the above parameters can be selected during use. Specific parameters can be selected according to the usage scenario during use.

[0044] It should be noted that in other embodiments of the present application, the material of the porous medium combustion layer 112 can also be other refractory materials, not limited to silicon carbide; the shape of the porous medium combustion layer 112 can also be set according to the usage scenario of the burner 100, not limited to the aforementioned annular shape; correspondingly, the material of the porous plate 113 can also be other materials. The pore diameter of the porous plate 113 can be greater than 1.2 mm. For example, it can be 3 mm, 2 mm, 1.5 mm, etc. The pore diameter of each pore of the porous plate 113 can be the same or not completely the same.

[0045] Further, in this embodiment, in order to make the mixture gas entering the first combustion assembly 110 burn more fully, the burner 100 further includes a gas mixing chamber 170. The outlet of the mixture gas delivery pipe 130 is communicated with the gas mixing chamber 170. The gas in the mixture gas delivery pipe 130 first enters the gas mixing chamber 170 for temporary storage and re-mixing and then enters the first combustion assembly 110. The gas mixing chamber 170 has an annular cavity, and the porous plate 113 is installed at the outlet end of the gas mixing chamber 170, so that the air flow output from the gas mixing chamber 170 passes through the porous plate 113 and enters the porous medium combustion layer 112. The gas mixing chamber 170 functions to re-uniform the mixture gas, and the gas mixing chamber 170 also functions to temporarily store the mixture gas.

[0046] In this embodiment, in order to make the air flow of the mixture gas entering the porous medium combustion layer 112 more uniform, a gas distribution plate 171 is provided in the gas mixing chamber 170. The gas distribution plate 171 is located at the opening of the mixture gas delivery pipe 130. The air flow output from the mixture gas delivery pipe 130 is blocked by the gas distribution plate 171 and then fills the inside of the gas mixing chamber 170. This can avoid the situation that the local air flow entering the porous medium combustion layer 112 is too large due to the large air flow velocity, and reduce the uniformity of the heat radiated through the porous medium combustion layer 112.

[0047] It should be noted that, in some embodiments of the present application, the burner 100 may not be provided with the gas distribution plate 171, nor may it be provided with the gas mixing chamber 170. Further, the first combustion assembly 110 may not be provided with the porous plate 113 and the heat insulation shell 111, and may only be provided with the porous medium combustion layer 112, and the mixture gas delivery pipe 130 is directly connected to the porous medium combustion layer 112.

[0048] As described above, the second combustion assembly 120 is located inside the outer shell 140. Along the flue gas flow direction of the porous medium combustion layer 112, the second combustion assembly 120 is located below the porous medium combustion layer 112, so that the flue gas of the porous medium combustion layer 112 can flow through the area where the second combustion assembly 120 is located.

[0049] The combustion-supporting gas delivery pipe 160 and the fuel gas delivery pipe 150 are both connected to the second combustion assembly 120. The fuel gas output from the fuel gas delivery pipe 150 burns in the area where the second combustion assembly 120 is located under the combustion support of the combustion-supporting gas output from the combustion-supporting gas delivery pipe 160.

[0050] In this embodiment, the second combustion assembly 120 includes a fuel gas nozzle 121, a swirl vane 122, and an igniter 123. The combustion-supporting gas delivery pipe 160 and the fuel gas delivery pipe 150 are both connected to the fuel gas nozzle 121. The swirl vane 122 is located at the outlet of the fuel gas delivery pipe 150, and the igniter 123 is connected to the fuel gas nozzle 121 to provide an ignition point for it. The swirl vane 122 functions to make the fuel gas output from the fuel gas delivery pipe 150 more dispersed, so that the fuel gas burns fully.

[0051] In this application, the burner 100 further includes a sleeve 180. The gas spray head 121 is located inside the sleeve 180. The sleeve 180 functions to gather the gases output from the secondary air delivery pipe 160 and the gas delivery pipe 150, enabling the gases output from the two to be fully mixed inside the sleeve 180 and then burn. The material of the sleeve 180 can be, for example, silicon carbide. It can be understood that in other embodiments of this application, the material of the sleeve 180 can be other refractory materials.

[0052] It should be noted that in other embodiments of this application, the second combustion assembly 120 may not be provided with the swirl vane 122. Correspondingly, the igniter 123 is not necessary either and can be not provided. When the burner 100 needs to be used, other independently provided ignition devices can be used for ignition.

[0053] In this embodiment, the outer shell 140 has a frustum shape and has a flue gas outlet 141. Compared with the porous medium combustion layer 112, the second combustion assembly 120 is closer to the flue gas outlet 141; under the guidance of the inner wall of the outer shell 140, the porous medium gas burner 112 will surely pass through the second combustion assembly 120.

[0054] In this embodiment, the porous medium gas burner 112 is annular, and the porous medium combustion layer 112 is disposed around the inner peripheral wall of the outer shell 140. The second combustion assembly 120 is located at the middle position of the outer shell 140 in the radial direction; the porous medium gas burner 112 is disposed around the second combustion assembly 120. After the porous medium combustion layer 112 burns, the unburned flue gas continues to burn after passing through the area where the second combustion assembly 120 is located; the flue gas around the second combustion assembly 120 burns again. Since the air will form a local high pressure after being heated, it entrains and mixes with the flue gas to achieve the purpose of further complete combustion.

[0055] It should be noted that in the embodiments of this application, the outer shell 140 can be of other shapes and is set according to the usage scenario of the burner 100. For example, it can be set to a square shape, etc. The positional relationship between the porous medium gas burner 112 and the second combustion assembly 120 is not limited to the porous medium gas burner 112 surrounding the second combustion assembly 120 as described above. For example, the two can be arranged side by side, etc.

[0056] Please refer to again Figure 5 and Figure 6, in this embodiment, in order to reduce the volume of the burner 100 and prevent it from occupying a large space, the combustion-supporting gas delivery pipe 160 and the fuel gas delivery pipe 150 are connected in a sleeve manner. In this embodiment, both the combustion-supporting gas delivery pipe 160 and the fuel gas delivery pipe 150 are circular pipes. The combustion-supporting gas delivery pipe 160 is sleeved outside the fuel gas delivery pipe 150, and the two are connected and communicated at the second combustion assembly 120. The gases transported by the two come into contact and burn at the position where the second combustion assembly 120 is located. The porous medium fuel gas burner 112 surrounds the periphery of the combustion-supporting gas delivery pipe 160.

[0057] In other embodiments of the present application, it can be set that the fuel gas delivery pipe 150 is sleeved outside the combustion-supporting gas delivery pipe 160; or, the combustion-supporting gas delivery pipe 160 and the fuel gas delivery pipe 150 are independently arranged, and both are connected to the second combustion assembly 120.

[0058] As an example, when using the second combustion assembly 120, for the embodiment in which the fuel gas delivery pipe 150 transports natural gas and the combustion-supporting gas delivery pipe 160 transports air, the excess air coefficient of the gas entering the second combustion assembly 120 can be adjusted between 1.3 and 2.0 by adjusting the flow rates of air and natural gas. For example, it can be 1.3, 1.5, 1.8, 1.9, 2.0, etc. The excess air coefficient between 1.3 and 2.0 can reduce the combustion temperature of the second combustion assembly 120 and reduce the generation amount of nitrogen oxides.

[0059] It should be noted that the excess air coefficient of the gas entering the second combustion assembly 120 between 1.3 and 2.0 is only an example, and it does not limit that the second combustion assembly 120 of the present application is only applicable to the aforementioned excess air coefficient.

[0060] The burner 100 provided by the embodiment of the present application has at least the following advantages:

[0061] After the mixed gas burns in the porous medium combustion layer 112, it has the advantages of good combustion stability, good fuel gas adaptability, uniform heat dissipation, low nitrogen oxides in the flue gas, and few flames. The flue gas after the porous medium combustion layer 112 burns contains unburned gas, and this gas flows to the area where the second combustion assembly 120 is located under the guidance of the outer shell 140. The raw material gas in the combustion area of the second combustion assembly 120 is fuel gas and combustion-supporting gas, and the aforementioned unburned gas burns more fully in this combustion area, making the burner 100 have the advantages of full combustion and uniform heat dissipation. In the combustion area of the second combustion assembly 120, the flue gas in the first combustion area is reheated again. Due to the increase in air temperature, a local high pressure is formed, so that the flue gas located in the outer shell 140 is entrained and mixed in the combustion area of the second combustion assembly 120, further burning completely while reducing the released flames, making it have the characteristics of no flame or few flames.

[0062] For an embodiment in which the pore area of the cross-section of the perforated plate 113 provided for the first combustion assembly 110 is smaller than the cross-sectional area of the mixed gas delivery pipe 130, after the gas enters the interior of the perforated plate 113 from the mixed gas delivery pipe 130, the pressure increases, which can make the flow rate of the mixed gas entering each pore of the perforated plate 113 consistent; thus, the heat dissipated from each part of the porous medium combustion layer 112 is relatively uniform.

[0063] For an embodiment in which the pore diameter of the perforated plate 113 is less than or equal to 1.2 mm, the perforated plate 113 has the function of preventing flashback.

[0064] This application also provides a combustion device, which includes a gas supply assembly and the above-mentioned burner 100 connected to the gas supply assembly.

[0065] The gas supply assembly is used to supply the gas required by the burner 100, for example, combustion-supporting gas, fuel gas, and mixed gas; in addition, the gas supply assembly can also be configured with detectors for detecting gas pressure or flow rate, such as pressure sensors, flow meters, and so on.

[0066] The combustion device provided by this application has all the advantages of the above-mentioned burner 100.

[0067] The above are only the preferred embodiments of this application and are not used to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A burner, characterized in that, The burner includes: A housing; A mixed gas delivery pipe; the mixed gas delivery pipe is used to deliver a mixture of fuel gas and combustion-supporting gas; A first combustion assembly; the first combustion assembly includes a porous medium combustion layer, the porous medium combustion layer is located inside the housing, and the porous medium combustion layer is communicated with the mixed gas delivery pipe; the first combustion assembly further includes a porous plate, one end of the porous plate is communicated with the mixed gas delivery pipe, and the other end is communicated with the porous medium combustion layer; the porous plate has a cross-section in a direction perpendicular to the delivery direction of the mixed gas, and the sum of the pore areas of the cross-section is smaller than the cross-sectional area of the mixed gas delivery pipe; A fuel gas delivery pipe; the fuel gas delivery pipe is used to deliver fuel gas; A combustion-supporting gas delivery pipe; the combustion-supporting gas delivery pipe is used to deliver combustion-supporting gas; and A second combustion assembly; the second combustion assembly is located inside the housing; both the combustion-supporting gas delivery pipe and the fuel gas delivery pipe are connected to the second combustion assembly; the second combustion assembly is located below the porous medium combustion layer, so that the flue gas of the porous medium combustion layer can flow through the second combustion assembly; the combustion-supporting gas delivery pipe is sleeved outside the fuel gas delivery pipe, and the porous medium combustion layer surrounds the combustion-supporting gas delivery pipe; or, the fuel gas delivery pipe is sleeved outside the combustion-supporting gas delivery pipe, and the porous medium combustion layer surrounds the fuel gas delivery pipe; The burner further includes a sleeve; the second combustion assembly includes a fuel gas spray head and a swirl vane; the swirl vane is arranged at the outlet of the fuel gas delivery pipe, and both the fuel gas delivery pipe and the combustion-supporting gas delivery pipe are connected to the fuel gas spray head; the fuel gas spray head is located inside the sleeve.

2. The burner according to claim 1, characterized in that, The first combustion assembly further includes a heat-insulating shell, and both the porous plate and the porous medium combustion layer are located inside the heat-insulating shell.

3. The burner according to claim 1, characterized in that, The pore diameter of the porous plate is less than or equal to 1.2 mm.

4. The burner according to any one of claims 1-3, wherein The burner further includes a gas mixing chamber connected to the housing, the mixed gas delivery pipe and the porous medium combustion layer are both communicated with the gas mixing chamber; a gas distribution plate is arranged inside the gas mixing chamber.

5. A combustion device, characterized in that, The combustion device includes a gas supply assembly and the burner according to any one of claims 1-4 connected to the gas supply assembly.

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