Multi-fuel porous medium combustion equipment and working method thereof

Abstract

The invention discloses multi-fuel porous medium combustion equipment and a working method thereof, solves the problem that in the prior art, a fuel and air mixing structure is not suitable for catalytic combustion reaction requirements, and has the beneficial effects that fuel and air are fully mixed, and the catalytic combustion effect is guaranteed. According to the specific scheme, the multi-fuel porous medium combustion equipment comprises an outer shell, an air inlet pipe is arranged on the outer shell, an inner shell is arranged on the inner side of the outer shell, porous media are arranged in the inner shell, a fuel air premixer is arranged at the input end of the porous media, an exhaust pipe is arranged at the other end of the porous media, and the exhaust pipe is detachably connected with the outer shell; the fuel and air premixer comprises a premixer shell, a plurality of fuel distribution chambers are arranged in the premixer shell, a plurality of fuel air inlet pipes penetrate through the shell to be communicated with the fuel distribution chambers, the fuel distribution chambers are provided with gas circulation channels communicated with the two end faces of the fuel distribution chambers, and the fuel distribution chambers are provided with multiple sections of nozzle areas. And each fuel inlet pipe corresponds to the corresponding nozzle area so as to spray different fuels at different positions.

Description

Technical Field

[0001] The invention relates to the technical field of burners, in particular to a multi-fuel porous medium combustion device and a working method thereof. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Regarding the burner, there is a catalytic burner in the prior art, in which a catalyst is arranged. The catalyst carrier is made of a porous material with a large specific surface area and a suitable pore size. When the gas heated to a set temperature passes through the catalyst layer, the gas is adsorbed on the catalyst on the surface of the porous material, which increases the chance of gas contact and collision and improves the activity. The inventors have found that the existing catalytic burners have the following problems:

[0004] The fuel-air premixing structure usually has only one small output port. If the mixed gas only enters the porous medium through the small output port, it cannot fully react in the porous medium.

[0005] The fuel-air premixing structure is mainly aimed at premixing one type of fuel with air, and cannot achieve uniform premixing of multiple fuels with air;

[0006] The fuel-air premixing structure can achieve preliminary premixing of fuel and air. The air is accelerated and flows quickly, but the mixing uniformity with the fuel is poor. It is suitable for flame combustion but not for catalytic combustion. Summary of the invention

[0007] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a multi-fuel porous media combustion device, which can achieve different mixing distances for different fuels to ensure that they are fully mixed with air.

[0008] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0009] A multi-fuel porous medium combustion device comprises an outer shell, an air intake pipe is arranged on the outer shell, an inner shell is arranged inside the outer shell, a porous medium is arranged inside the inner shell, a fuel-air premixer is arranged at the input end of the porous medium, an exhaust pipe is arranged at the other end, and the exhaust pipe is detachably connected to the outer shell;

[0010] The fuel-air premixer includes a premixer shell, in which a plurality of fuel distribution chambers are arranged, a plurality of fuel intake pipes respectively pass through the shell and communicate with the fuel distribution chambers, the fuel distribution chamber has a gas flow channel connecting its two end surfaces, a plurality of nozzle areas are arranged in the fuel distribution chamber, each fuel intake pipe corresponds to a corresponding nozzle area to spray different fuels at different positions, so that different fuels are mixed with air at corresponding distances.

[0011] In a multi-fuel porous media combustion device as described above, the outer shell is provided with the air intake pipe at one end of the fuel-air premixer. After part of the air enters the outer shell, it passes through the space between the outer shell and the inner shell and enters the exhaust pipe through the first hole of the exhaust pipe to control the temperature of the porous medium, so that the temperature of the porous medium is within the set temperature range, avoiding excessive temperature at the porous medium and reducing the exhaust gas outlet temperature.

[0012] In the multi-fuel porous medium combustion device as described above, the premixer housing is fixed to one end of the inner shell, and the premixer housing and the outer shell are also spaced apart so that air can flow to the outside of the inner shell to cool the inner shell, and the air then enters the exhaust pipe through the first hole;

[0013] The fuel distribution chamber includes a central tube, and a first fuel distribution chamber and a second fuel distribution chamber are arranged outside the central tube. The nozzle areas of the first fuel distribution chamber and the second fuel distribution chamber are different, and the distance between the first fuel distribution chamber and the porous medium is smaller than the distance between the second fuel distribution chamber and the porous medium.

[0014] In a multi-fuel porous media combustion device as described above, the premixer shell includes an annular ring and two baffles, the two baffles are arranged at both ends of the annular ring, the baffles are arranged along the radial direction of the outer shell, the two baffles are hollowed out, the fuel distribution chamber is connected to the hollow parts of the two baffles, a first fuel cavity is formed between the premixer shell and the fuel distribution chamber, a first fuel feed pipe passes through the outer shell and the premixer shell and is connected to the first fuel cavity, and the first fuel cavity is connected to the first fuel distribution chamber.

[0015] A multi-fuel porous medium combustion device as described above, wherein the fuel distribution chamber comprises a distribution chamber shell, a plurality of first fuel distribution chambers are arranged in the distribution chamber shell, a plurality of first openings are arranged in the distribution chamber shell, and the first fuel distribution chamber is connected to the first fuel cavity through the first openings;

[0016] The side wall of the first fuel distribution chamber is provided with a plurality of first fuel nozzles, and the diameters of the first fuel nozzles are different.

[0017] A multi-fuel porous medium combustion device as described above, wherein the central tube is arranged beyond the fuel distribution chamber, the central tube is connected to the second fuel feed pipe, the central tube is provided with a plurality of second openings, and each second opening is connected to the second fuel distribution chamber;

[0018] The side wall of the second fuel distribution chamber is provided with a plurality of second fuel nozzles, and the diameters of the second fuel nozzles are different;

[0019] The first fuel distribution chamber and the second fuel distribution chamber are arranged at a distance from each other.

[0020] A multi-fuel porous media combustion device as described above, wherein a plurality of first fuel distribution chambers are provided along the outer side of the central tube, and a plurality of second fuel distribution chambers are provided along the outer side of the central tube;

[0021] The first fuel distribution chamber is a first guide vane arranged in the radial direction of the central tube, and the first guide vane is hollow;

[0022] The second fuel distribution chamber is a second guide vane arranged in the radial direction of the central tube, and the second guide vane is hollow.

[0023] The multi-fuel porous medium combustion device as described above further comprises a spark plug, the spark plug passes through the housing and enters the exhaust pipe, one end of the exhaust pipe extends into the housing and abuts against the porous medium;

[0024] The exhaust pipe is detachably connected to the end of the housing;

[0025] A plurality of supporting members are arranged between the inner shell and the outer shell.

[0026] In the multi-fuel porous medium combustion device as described above, a heat-insulating layer is provided between the inner shell and the porous medium.

[0027] In a second aspect, the present invention further provides a working method of a multi-fuel porous medium combustion device, characterized in that it includes the following contents:

[0028] Air enters the interior of the housing through the air intake duct;

[0029] Different fuels enter the fuel distribution chamber and are ejected from the corresponding nozzle area. Different fuels are mixed with air at corresponding distances. The ejected fuels are mixed with air and then enter the porous medium to undergo catalytic combustion reaction.

[0030] The combusted gas is discharged through the exhaust pipe.

[0031] The beneficial effects of the present invention are as follows:

[0032] 1) The burner structure of the present invention is reasonably arranged, and a fuel-air premixer is arranged at the input end of the porous medium. The fuel-air premixer includes a premixer housing, and a plurality of fuel distribution chambers are arranged in the premixer housing. The plurality of fuel distribution chambers can achieve mixing of air and fuel, ensuring that the input end of the porous medium is covered, so that the mixed gas is dispersed through the porous medium, and the fuel and air are fully reacted when passing through the porous medium;

[0033] In this way, air enters the gas flow channel and mixes with the fuel sprayed out from the nozzle area of ​​the fuel distribution chamber, which can not only realize the injection of one fuel, but also realize the separate injection of multiple fuels, and realize separate mixing with air at different distances from the porous medium, thereby meeting the combustion requirements of fuels with different calorific values.

[0034] 2) The exhaust pipe structure in the present invention is reasonably arranged, and the exhaust pipe can be offset against the porous medium to limit one end of the porous medium; a spark plug is arranged at the exhaust pipe, and fuel and air can be ignited at the exhaust pipe to heat the entire burner to meet the temperature requirement of the porous medium combustion; a first hole is arranged at the exhaust pipe, and partial cooling is performed through the first hole exhaust pipe to control the temperature of the porous medium, so that the temperature of the porous medium is within the set temperature range, avoiding excessive temperature at the porous medium, and reducing the exhaust gas outlet temperature.

[0035] 3) The premixer housing structure of the present invention is reasonably arranged, the fuel distribution chamber is connected to the hollowed-out parts of the two baffles, and a first fuel cavity is formed between the premixer housing and the fuel distribution chamber, so that the first fuel first enters the first fuel cavity and then enters the corresponding first fuel distribution chamber through the first opening.

[0036] 4) The present invention sets a central tube in the center of the fuel distribution chamber, and the central tube is connected to the corresponding second fuel distribution chamber, so that the second fuel enters the second fuel distribution chamber through the central tube. It is independent of the first fuel distribution chamber, but can both spray fuel into the gas flow channel to mix with the air or gas flowing therethrough. The structural setting is reasonable and ingenious.

[0037] 5) In the present invention, the first fuel distribution chamber and the second fuel distribution chamber are both guide vanes. The guide vanes are hollow and have a set width. The guide vanes are arranged along the radial direction of the central tube and are not inclined relative to the central axis of the central tube. The air will not be accelerated. Through the arrangement of multiple guide vanes, sufficient mixing of fuel and air is achieved to be suitable for catalytic combustion in porous media. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0039] Figure 1 is an internal cross-sectional view of a multi-fuel porous media combustion device according to one or more embodiments of the present invention.

[0040] Figure 2 It is a schematic diagram of a fuel-air premixer in a multi-fuel porous media combustion device according to one or more embodiments of the present invention.

[0041] Figure 3 It is a schematic diagram of a single fuel distribution chamber in a multi-fuel porous media combustion device according to one or more embodiments of the present invention.

[0042] Figure 4 It is a cross-sectional schematic diagram of a fuel distribution chamber in a multi-fuel porous media combustion device according to one or more embodiments of the present invention.

[0043] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0044] Wherein: 1. air intake pipe, 2. second fuel feed pipe, 3. fuel-air premixer, 4. front support, 5. third fuel feed pipe, 6. outer shell, 7. inner shell, 8. insulation layer, 9. porous medium, 10. rear support, 11. spark plug hole, 12. spark plug bolt hole, 13. first hole, 14. outer shell flange, 15. tail exhaust body flange, 16. exhaust pipe, 17. premixer shell, 18. fuel distribution chamber, 19. second fuel nozzle, 20. first guide vane, 21. first opening, 22. center tube, 23. distribution chamber shell, 24. second opening, 25. second guide vane, 26. first fuel nozzle, 27. inner fuel nozzle, 28. baffle. DETAILED DESCRIPTION

[0045] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0046] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or their combinations;

[0047] As introduced in the background technology, the fuel-air mixing structure in the prior art is not suitable for the requirements of catalytic combustion reaction. In order to solve the above technical problems, the present invention proposes a multi-fuel porous media combustion device.

[0048] Embodiment 1

[0049] In a typical embodiment of the present invention, reference is made to Figure 1As shown, a multi-fuel porous medium combustion device comprises an outer shell 6, an air intake pipe 1 is arranged on the outer shell, an inner shell 7 is arranged inside the outer shell, a porous medium 9 is arranged inside the inner shell, a fuel-air premixer 3 is arranged at the input end of the porous medium, and an exhaust pipe 16 is arranged at the other end, and the exhaust pipe 16 is detachably connected to the outer shell;

[0050] The fuel-air premixer 3 includes a premixer shell 17, in which a plurality of fuel distribution chambers 18 are arranged. A plurality of fuel intake pipes pass through the shell and communicate with the fuel distribution chambers respectively. The fuel distribution chamber has a gas flow channel connecting its two end surfaces. The fuel distribution chamber is provided with a plurality of nozzle areas. Each fuel intake pipe corresponds to a corresponding nozzle area to spray different fuels at different positions, so that different fuels are mixed with air at corresponding distances.

[0051] Specifically, the outer shell 6 is provided with an air intake pipe 1 at one end of the fuel-air premixer 3. After part of the air enters the outer shell, it passes through the space between the outer shell and the inner shell and enters the exhaust pipe through the first hole of the exhaust pipe to control the temperature of the porous medium, so that the temperature of the porous medium is within the set temperature range, avoiding the temperature at the porous medium being too high and reducing the exhaust gas outlet temperature.

[0052] The first hole is a mixing hole 13, and a plurality of mixing holes 13 are provided in a circle, and an interval of a set angle is set between two adjacent mixing holes.

[0053] refer to Figure 2 As shown, the premixer housing 17 is fixed to one end of the inner shell 7, and the premixer housing and the outer shell are also spaced apart so that air can flow to the outside of the inner shell to cool the inner shell, and then the air enters the exhaust pipe 16 through the first hole;

[0054] The fuel distribution chamber 18 includes a central tube 22, and a first fuel distribution chamber and a second fuel distribution chamber are arranged outside the central tube. The nozzle areas of the first fuel distribution chamber and the second fuel distribution chamber are different, and the distance between the first fuel distribution chamber and the porous medium 9 is smaller than the distance between the second fuel distribution chamber and the porous medium.

[0055] refer to Figure 2 As shown, the premixer housing 17 includes an annular ring and two baffles 28, one side baffle 28 can contact one end of the porous medium, the two baffles are arranged at both ends of the annular ring, the baffles are arranged along the radial direction of the shell, the two baffles are hollowed out, the fuel distribution chamber is connected to the hollow parts of the two baffles, a first fuel cavity is formed between the premixer housing and the fuel distribution chamber, the first fuel feed pipe passes through the shell and the premixer housing and is connected to the first fuel cavity, and the first fuel cavity is connected to the first fuel distribution chamber.

[0056] The fuel distribution chamber includes a distribution chamber shell, in which a plurality of first fuel distribution chambers are arranged, and the distribution chamber shell is provided with a plurality of first openings, and the first fuel distribution chamber is connected with the first fuel cavity through the first openings; a plurality of first fuel nozzles are arranged on the side wall of the first fuel distribution chamber, and each first fuel nozzle can be placed in the same plane.

[0057] In addition, the center tube is arranged beyond the fuel distribution chamber, the center tube is connected to the second fuel feed pipe, and a plurality of second openings are arranged on the center tube, each second opening is connected to the second fuel distribution chamber; a plurality of second fuel nozzles are arranged on the side wall of the second fuel distribution chamber, and each second fuel nozzle can be arranged on the same plane; the first fuel distribution chamber and the second fuel distribution chamber are arranged at a distance.

[0058] Specifically, refer to Figure 3 and Figure 4 As shown, a plurality of first fuel distribution chambers are arranged along the outer side of the center tube, and a plurality of second fuel distribution chambers are arranged along the outer side of the center tube; the first fuel distribution chamber is a first guide vane arranged in the radial direction of the center tube, one end of the first guide vane is connected to the center tube, and the other end is connected to the distribution chamber shell 23, and the first guide vane is hollow, so the first opening is a long hole; the second fuel distribution chamber is a second guide vane arranged in the radial direction of the center tube, one end of the second guide vane is connected to the distribution chamber shell 23, one side of the other end is connected to the center tube, and the other side is spaced a distance from the tip of the center tube, and an inner fuel nozzle 27 is arranged here, the second guide vane is hollow, and the corresponding second opening is also a long hole.

[0059] It is easy to understand that, in order to avoid affecting the flow rate of the air, the first guide blades 25 correspond to the second guide blades 20 one by one, and the one-to-one corresponding first guide blades and second guide blades are arranged on the same plane.

[0060] In this embodiment, multiple fuel distribution chambers 18 are set in the premixer housing 17, specifically 7 locations, one location is set in the middle position, and 6 locations are set on the surrounding sides of the middle position. The second fuel feed pipe 2 is set with a branch pipe and an annular pipe connected to the central pipe at the center position, and the annular pipe is connected to the central pipe of another fuel distribution chamber.

[0061] The high calorific value fuel enters the central tube 22 through the second fuel feed pipe 2, and enters the second guide vane 20 through the eight second openings 21 connected thereto. Five second fuel nozzles 19 are distributed radially on both sides of the second guide vane 20, and the diameters of the second fuel nozzles 19 increase successively along the radial direction. The high calorific value fuel is ejected from the second fuel nozzles 19 and mixed with the air flowing from the left side.

[0062] The low calorific value fuel enters the premixer housing 17 through the first fuel feed pipe 5, and enters the first guide vane 25 through the eight first openings 24 connected thereto. Five first fuel nozzles 26 are radially distributed on both sides of the first guide vane 25. The diameters of the first fuel nozzles 26 increase successively along the radial direction of the distribution chamber housing 23. An inner fuel nozzle 27 is also arranged on the inner side of the first guide vane 25 near the center tube. The low calorific value fuel is ejected from the first fuel nozzles 26 and the inner fuel nozzles 27 and mixed with the incoming air on the left side. Because it is very close to the porous medium 9, the mixing distance is very short.

[0063] In addition, both sides of the distribution chamber shell 23 of the fuel distribution chamber 18 are welded to both sides of the premixer shell 17 to ensure that the low calorific value fuel is only sprayed from the first fuel nozzle 26 and the inner fuel nozzle 27.

[0064] It is easy to understand that the spark plug passes through the shell and enters the exhaust pipe. The spark plug is fixed on the spark plug bolt hole 12 of the shell. Its electrode passes through the spark plug hole 11 at the exhaust pipe to ignite the incoming fuel and air mixture when the device is started. One end of the exhaust pipe extends into the shell and abuts against the porous medium. The exhaust pipe is detachably connected to the end of the shell.

[0065] Specifically, a shell flange 14 is provided at the end of the shell, and an exhaust pipe 16 is connected to the shell flange 14 through a tail exhaust body flange 15. One side of the exhaust pipe 16 extends into the interior of the shell 6 to support the porous medium 9 to prevent it from moving. The exhaust pipe 16 can be removed and the porous medium 9 can be replaced. A protrusion is provided at one end of the inner shell, and the protrusion is snap-connected with one end of the exhaust pipe. The distance between the end of the inner shell away from the fuel-air mixer and the first hole is greater than the distance between the end and the spark plug.

[0066] It can be understood that there are multiple support members between the inner shell and the outer shell, namely the front support 4 and the rear support 10. The front support and the rear support are both annular rings, both of which have multiple openings for air to flow through. Specifically, the two support members are arranged on the two end sides of the inner shell.

[0067] It is easy to understand that an existing high temperature resistant insulation layer 8 is provided between the inner shell and the porous medium, which can maintain the temperature of the porous medium 9 within a certain range and protect the outer shell 7 from being ablated by high temperature.

[0068] In addition, the porous medium can be made of ceramic material or other high temperature resistant material. The porous medium is provided with a catalyst for fuel combustion. The porous medium has pores. The mixed gas of air and fuel flows through the flame tube and enters the catalytic component, and a catalytic combustion reaction is carried out on the fine surface of the porous medium.

[0069] Air enters from the air intake pipe 1, part of which passes through the fuel-air premixer 4 to mix with the fuel and enters the porous medium 9 for combustion, and the other part passes through the opening on the front support 4, the gap between the outer shell 6 and the inner shell 7, and the opening on the rear support 10, and is ejected from the first hole 13 on the exhaust pipe 16 to mix with the high-temperature combustion gas flowing from the porous medium 9 to reduce the exhaust gas outlet temperature.

[0070] The low calorific value fuel enters the fuel-air premixer 4 through the second fuel feed pipe, and enters the porous medium 9 for combustion after being mixed with air; the high calorific value fuel enters the fuel-air premixer 4 through the second fuel feed pipe 2, and enters the porous medium 9 for combustion after being mixed with air.

[0071] Embodiment 2

[0072] This embodiment discloses a working method of a multi-fuel porous medium combustion device, including the following contents:

[0073] Air enters the interior of the housing through the air intake duct;

[0074] Different fuels enter the fuel distribution chamber and are ejected from the corresponding nozzle area. Different fuels are mixed with air at corresponding distances. The ejected fuel and air are mixed and flow through the porous medium to the exhaust pipe. The spark plug ignites to ignite the fuel and air. After a set time, the temperature at the porous medium reaches the set temperature. The subsequent fuel and air enter the porous medium to cause a catalytic combustion reaction.

[0075] The combusted gas is discharged through the exhaust pipe.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-fuel porous media combustion device, characterized in that: It comprises an outer shell, an air intake pipe is arranged on the outer shell, an inner shell is arranged inside the outer shell, a porous medium is arranged inside the inner shell, a fuel-air premixer is arranged at the input end of the porous medium, an exhaust pipe is arranged at the other end, and the exhaust pipe is detachably connected to the outer shell; The fuel-air premixer includes a premixer shell, in which a plurality of fuel distribution chambers are arranged, a plurality of fuel intake pipes respectively pass through the shell and communicate with the fuel distribution chambers, the fuel distribution chamber has a gas flow channel connecting its two end surfaces, a plurality of nozzle areas are arranged in the fuel distribution chamber, each fuel intake pipe corresponds to a corresponding nozzle area to spray different fuels at different positions, so that different fuels are mixed with air at corresponding distances.

2. A multi-fuel porous media combustion device according to claim 1, characterized in that: The outer shell is provided with the air intake pipe at one end of the fuel-air premixer. After part of the air enters the outer shell, it passes through the space between the outer shell and the inner shell and enters the exhaust pipe through the first hole of the exhaust pipe to control the temperature of the porous medium.

3. A multi-fuel porous media combustion device according to claim 1, characterized in that: The premixer housing is fixed to one end of the inner housing; The fuel distribution chamber includes a central tube, and a first fuel distribution chamber and a second fuel distribution chamber are arranged outside the central tube. The nozzle areas of the first fuel distribution chamber and the second fuel distribution chamber are different, and the distance between the first fuel distribution chamber and the porous medium is smaller than the distance between the second fuel distribution chamber and the porous medium.

4. A multi-fuel porous media combustion device according to claim 3, characterized in that: The premixer housing comprises an annular ring and two baffles, the two baffles are arranged at both ends of the annular ring, the baffles are arranged along the radial direction of the shell, the two baffles are hollowed out, the fuel distribution chamber is connected to the hollow parts of the two baffles, a first fuel cavity is formed between the premixer housing and the fuel distribution chamber, a first fuel feed pipe passes through the shell and the premixer housing and is connected to the first fuel cavity, and the first fuel cavity is connected to the first fuel distribution chamber.

5. A multi-fuel porous media combustion device according to claim 4, characterized in that: The fuel distribution chamber comprises a distribution chamber housing, a plurality of first fuel distribution chambers are arranged in the distribution chamber housing, a plurality of first openings are arranged in the distribution chamber housing, and the first fuel distribution chambers are connected with the first fuel cavity through the first openings; The side wall of the first fuel distribution chamber is provided with a plurality of first fuel nozzles, and the diameters of the first fuel nozzles are different.

6. A multi-fuel porous media combustion device according to claim 3, characterized in that: The central tube is arranged beyond the fuel distribution chamber, the central tube is connected to the second fuel feed pipe, the central tube is provided with a plurality of second openings, each second opening is connected to the second fuel distribution chamber; The side wall of the second fuel distribution chamber is provided with a plurality of second fuel nozzles, and the diameters of the second fuel nozzles are different; The first fuel distribution chamber and the second fuel distribution chamber are arranged at a distance from each other.

7. A multi-fuel porous media combustion device according to claim 3, characterized in that: A plurality of the first fuel distribution chambers are provided along the outer side of the central tube, and a plurality of the second fuel distribution chambers are provided along the outer side of the central tube; The first fuel distribution chamber is a first guide vane arranged in the radial direction of the central tube, and the first guide vane is hollow; The second fuel distribution chamber is a second guide vane arranged in the radial direction of the central tube, and the second guide vane is hollow.

8. The multi-fuel porous media combustion device according to claim 1, characterized in that: Also included is a spark plug, which passes through the housing and enters the exhaust pipe, and one end of the exhaust pipe extends into the housing and abuts against the porous medium; The exhaust pipe is detachably connected to the end of the housing; A plurality of supporting members are arranged between the inner shell and the outer shell.

9. The multi-fuel porous media combustion device according to claim 1, characterized in that: A heat-insulating layer is arranged between the inner shell and the porous medium.

10. A working method of a multi-fuel porous media combustion device according to any one of claims 1 to 9, characterized in that: It includes the following: Air enters the interior of the housing through the air intake duct; Different fuels enter the fuel distribution chamber and are ejected from the corresponding nozzle area. Different fuels are mixed with air at corresponding distances. The ejected fuels are mixed with air and then enter the porous medium to undergo catalytic combustion reaction. The combusted gas is discharged through the exhaust pipe.

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