A catalytic burner

Abstract

The present application relates to a catalytic burner, and relates to the technical field of burners. The burner includes a shell, an air input pipe and a gas input pipe, and a mixing device. The mixing device includes: a honeycomb ceramic brick, which is arranged in the shell and has a diversion channel; a porous ceramic sheet, which is arranged on the shell and has a vent hole, and the thickness of the honeycomb ceramic brick is greater than the thickness of the porous ceramic sheet, and the porous ceramic sheet, the honeycomb ceramic brick and the shell cooperate to form an equalizing chamber; a premixing mechanism, which is used to premix the input air and gas, so that the premixed gas passes through the honeycomb ceramic brick, the equalizing chamber and the porous ceramic sheet in sequence. The present application uses a premixing mechanism to premix, and the honeycomb ceramic brick forms a blocking effect so that the gas flows by itself, and finally forms a certain buffer through the equalizing chamber, thereby further improving the mixing effect of the gas and air, reducing the probability of nitrogen oxides and increasing the life of the burner.

Description

Technical Field

[0001] The present application relates to the technical field of burners, and in particular to a catalytic burner. Background Art

[0002] Burner is a general term for a device that sprays fuel and air in a certain way for mixed combustion. It is usually made of corrosion-resistant and high-temperature-resistant materials such as stainless steel or metal.

[0003] The burner burns after passing through air and gas. The uniformity of the mixture of air and gas directly determines the nitrogen oxide emission effect of the burner. In addition, the uneven mixing makes it easy for flashback to occur during combustion, which will greatly reduce the life of the burner. Therefore, the uniformity of the mixture of gas and air is an issue that needs to be urgently addressed. Summary of the invention

[0004] In order to improve the uniformity of the mixing of fuel gas and air, reduce the probability of nitrogen oxide generation and increase the life of the burner, the present application provides a catalytic burner.

[0005] The present application provides a catalytic burner, which adopts the following technical solution:

[0006] A catalytic burner comprises a housing, an air inlet pipe and a gas inlet pipe arranged on the housing, wherein a mixing device for mixing air and gas is arranged on the housing, and the mixing device comprises:

[0007] Honeycomb ceramic bricks are arranged in a shell and are evenly provided with a plurality of flow channels for gas to pass through;

[0008] A porous ceramic sheet is arranged on the shell and is evenly provided with a plurality of vent holes for gas to pass through. The thickness of the honeycomb ceramic brick is greater than that of the porous ceramic sheet. The porous ceramic sheet, the honeycomb ceramic brick and the shell cooperate to form a pressure equalizing chamber.

[0009] The premixing mechanism is used to premix the input air and fuel gas, so that the premixed gas passes through the honeycomb ceramic bricks, the pressure equalizing chamber and the porous ceramic sheet in sequence.

[0010] By adopting the above technical solution, the air input pipe inputs air and the gas input pipe inputs gas. The air and gas are first premixed through the premixing mechanism, and then the premixed gas is moved to the honeycomb ceramic bricks. The diversion channels are long and dense in number, which can form a certain blocking effect on the premixed gas. Due to the self-balance of the fluid, the high-pressure gas will automatically flow to the low-pressure gas. The blocked gases can flow with each other, thereby further making the gas mixing more uniform. The gas is then moved to the equalizing pressure chamber for buffering. The gas in the equalizing pressure chamber can further flow to make the mixing more uniform. Finally, the mixed gas is output through the vent.

[0011] Premixing is performed through a premixing mechanism, and the honeycomb ceramic bricks form a blocking effect to allow the gas to flow on its own. Finally, a certain buffer is formed through the pressure equalizing chamber, thereby further improving the mixing effect of the gas and air. In addition, the honeycomb ceramic bricks and the pressure equalizing chamber allow the mixed gas and air to flow in sections, reducing the probability of mixed gas being concentrated near the combustion point and prone to flashback, reducing the probability of nitrogen oxide generation and increasing the life of the burner.

[0012] Honeycomb ceramic bricks and porous ceramic sheets can also absorb the heat conducted through the combustion point in time. The absorbed heat is used to preheat the mixed gas. Moreover, the porous structures of both can make the air and gas mix with each other, making the mixing more uniform. At the same time, the porous medium and the gas therein undergo strong heat conduction, convection and radiation heat exchange with the outside world, making the internal temperature of the porous medium more uniform and the gas mixing more uniform, thereby further reducing the probability of nitrogen oxides generation and increasing the life of the burner.

[0013] At the same time, the purpose of the present application is to make the mixed gas burn on the outside of the burner, and try to avoid burning on the honeycomb ceramic bricks and porous ceramic sheets, so as to reduce the risk of flashback. Therefore, it is different from the porous medium combustion in the prior art. The porous medium combustion is burned inside the medium, so the porous medium is covered with a plurality of curved small holes to achieve combustion. Multiple curved small holes are prone to flashback, which increases the danger. The small holes in the present application are all straight holes and the number is less than the number of small holes in the porous medium, so that the gas can move at a certain speed and the mixed gas is burned outside, reducing the risk of flashback and improving the life of the burner and the safety during use.

[0014] Optionally, the premixing mechanism comprises:

[0015] A conical mixer is arranged in the shell and is conical in shape. The diameter of the conical mixer at one end close to the honeycomb ceramic brick is larger than the diameter of the end away from the honeycomb ceramic brick. A plurality of air spray holes are provided along the axial and radial directions of the conical mixer. The air spray holes are connected to the air input pipe and allow air to pass into the conical mixer.

[0016] A buffer ring is arranged in the housing and abuts against the opposite end of the honeycomb ceramic brick and the conical mixer and has an inner diameter greater than or equal to the maximum inner diameter of the conical mixer, and the plurality of diversion channels are located inside the buffer ring;

[0017] A gas nozzle is coaxially arranged on an end of the conical mixer away from the buffer ring and is connected to the gas input pipe. The gas nozzle is provided with a plurality of gas spray holes spaced axially around the conical mixer for supplying gas into the conical mixer.

[0018] The adjusting plate is annular and coaxially arranged on the gas nozzle through a connecting mechanism. The adjusting plate is used to block and adjust the gas and cooperates with the inner wall of the conical mixer to form an adjusting cavity for gas to pass through. The connecting mechanism is used to adjust the position of the adjusting plate along the axial direction of the gas nozzle.

[0019] By adopting the above technical solution, air enters through the air input pipe and is then ejected through the air nozzle into the conical mixer, and at the same time, gas is ejected through the gas input pipe and the gas nozzle, so that the gas and air are mixed, and the air nozzle is located on the peripheral side of the gas nozzle, so that the mixed gas is pushed by the air to move toward the center of the conical mixer. Because the adjustment plate is coaxially arranged on the gas nozzle through the connecting assembly, the connecting mechanism is located at the center of the conical mixer to block the gas from moving back, thereby reducing the probability of the gas moving toward the center of the conical mixer, and further improving the mixing effect.

[0020] When the gas touches the adjustment plate, it will move back, so that the mixed gas can be restricted to flow in the area between the adjustment plate and the gas nozzle. The gas at the high pressure moves toward the low pressure, so that the gas mixing is more uniform, and then the mixed gas continues to move forward through the adjustment cavity, and then the gas is mixed and moves to the honeycomb ceramic brick, thereby further improving the uniformity of gas mixing. At the same time, the position of the adjustment plate can be adjusted according to the required mixing effect and the required mixing ratio of different types of gas and air. The conical mixer is conical, so the adjustment of the adjustment plate position can adjust the size of the adjustment cavity, thereby adjusting the gas blocking effect. Therefore, the operation of the burner under different working conditions can also reduce the probability of nitrogen oxide production and increase the life of the burner.

[0021] Therefore, the regulating plate can achieve the following effects through its moving position along the axis and the size of its diameter. First, it can adjust the airflow distribution on the plane of the honeycomb ceramic brick, which is crucial for the uniformity of airflow distribution during short-distance mixing of the nozzle. Second, it can adjust the degree of mixing of gas and air as needed.

[0022] Optionally, the connecting mechanism includes:

[0023] A support member, coaxially arranged on the gas nozzle and extending into the conical mixer;

[0024] A sliding tube is arranged on the adjustment plate and a sliding sleeve is arranged on the support member;

[0025] The locking piece is arranged on the sliding tube and is used for positioning the sliding tube.

[0026] By adopting the above technical solution, the locking part is unlocked, and then the sliding tube can be moved to drive the adjustment plate to move. After the movement is completed, the locking part is locked, so that the position of the adjustment plate can be adjusted, and the support part can support the adjustment plate. The support part is located at the center of the conical mixer, so the support part reduces the amount of gas moving toward the center of the conical mixer, thereby further reducing the probability of nitrogen oxide generation and increasing the life of the burner.

[0027] Optionally, the connecting mechanism includes:

[0028] A moving part is coaxially slidably arranged on the gas nozzle, and the adjusting plate is arranged on the moving part;

[0029] A positioning plate, slidably arranged on the moving part;

[0030] The positioning screw is threadedly connected to the gas input pipe and pushes the positioning plate to press against the moving part for positioning.

[0031] By adopting the above technical solution, the positioning screw is turned away from the positioning plate, thereby driving the movable part and the adjustment plate to move, thereby adjusting the size of the adjustment cavity. After the adjustment is completed, the positioning screw is turned to push the positioning plate to press against the movable part for positioning, so as to achieve the positioning of the adjustment plate. At the same time, the positioning screw and the movable part are both located outside the shell, thereby greatly improving the convenience of adjustment, and even being able to perform adjustment when the burner is burning, thereby greatly improving the adjustment effect, thereby further reducing the probability of nitrogen oxides generation and increasing the life of the burner.

[0032] Optionally, a mounting sleeve is coaxially and detachably provided on the movable part, a plurality of spiral blades are coaxially provided on the mounting sleeve, the diameter of the spiral blades gradually increases along the axis of the movable part and the diameter is the largest at one end close to the honeycomb ceramic brick, a driving sleeve is provided on the plurality of spiral blades, a driving hole is provided on the driving sleeve for the passage of the plurality of spiral blades and the diameter of the driving hole is larger than the minimum diameter of the spiral blades and smaller than the maximum diameter of the spiral blades, the adjusting plate is provided on the driving sleeve and moves and rotates along the axis of the movable part under the push of gas and the action of the plurality of spiral blades, and a blocking block with elasticity is provided on the movable part for preventing the driving sleeve from detaching from the spiral blades.

[0033] By adopting the above technical solution, the driving sleeve is arranged on a plurality of spiral sheets, and the adjusting plate is located on the driving sleeve. When the gas pressure between the adjusting plate and the gas nozzle is too large, the gas pushes the adjusting plate to overcome the friction force to realize the movement of the adjusting plate and the driving sleeve, and the spiral sheets cooperate with the driving holes to cause the adjusting plate to rotate. The rotation of the adjusting plate can stir the gas, thereby accelerating the gas flow rate and achieving a better gas mixing effect. The movement of the adjusting plate increases the regulating chamber, thereby accelerating the flow of the gas. Therefore, the gas pressure becomes smaller and cannot push the adjusting plate to move. Moreover, as the moving plate and the driving sleeve move, the diameter of the spiral sheets located at the driving hole gradually increases, thereby causing the resistance to the adjusting plate to gradually increase, thereby realizing the positioning of the adjusting plate.

[0034] When the mixed gas moves to the honeycomb ceramic brick and is blocked, part of the mixed gas that has not passed through will also flow back, and there will be a change in the diameter of the spiral sheet. The force required to push the adjustment plate back is much smaller than the force of the gas pushing the adjustment plate away from the gas nozzle. Therefore, the refluxed gas can also push the adjustment plate back, thereby realizing a back and forth drive to move the adjustment plate to balance the pressure on both sides of the adjustment plate. Moreover, the length of the spiral sheet is generally designed to be shorter, so that the adjustment plate can be slightly moved back and forth, thereby being able to adapt to changes in gas and air pressure, greatly reducing the probability of nitrogen oxides production and increasing the life of the burner.

[0035] At the same time, the blocking block can prevent the adjusting sleeve from detaching from the spiral sheet, thereby improving the stability of the adjusting plate during operation, and the force of pushing the adjusting plate back is relatively small, so the source of the back thrust is against the wind direction. Therefore, the blocking block does not need to be large to prevent the adjusting sleeve from detaching, and when replacing the adjusting sleeve, the adjusting sleeve and the adjusting plate can be removed or installed by manually squeezing the blocking block, which improves the convenience of replacing the adjusting sleeve and the adjusting plate.

[0036] Optionally, an adjustment tube is coaxially and detachably provided on the movable part, and an adjustment groove is coaxially opened on the outer wall of the adjustment tube. The diameter of the adjustment groove gradually increases from the middle position to both ends and the diameters at both ends are the same. A movable sleeve connected to the adjustment plate is slidably installed on the adjustment groove through a locking assembly. The locking assembly forms a circular locking space that coincides with the axis of the adjustment groove and can adjust the size. When the movable sleeve slides on the adjustment groove, the diameter of the locking space is larger than the minimum diameter of the adjustment groove and smaller than the maximum diameter of the adjustment groove.

[0037] By adopting the above technical scheme, the adjustment groove and the locking space cooperate to realize the movement of the adjustment plate, and the size of the middle position of the adjustment groove is the smallest, so the moving sleeve and the adjustment plate maintain a tendency to move to the middle position of the adjustment groove under the action of gravity, and the pressure between the adjustment plate and the gas nozzle becomes larger, which pushes the moving sleeve to overcome the friction and move, and the movement of the moving sleeve drives the adjustment plate to move. The movement of the adjustment plate can increase the size of the adjustment cavity, thereby reducing the pressure between the adjustment plate and the gas nozzle, and as the pressure decreases, the thrust on the adjustment plate decreases; at the same time, as the moving sleeve moves, the diameter of the adjustment groove increases, that is, the resistance to the moving sleeve increases, so that the adjustment plate is easy to move back to the middle position of the adjustment groove, and moves back under the push of the reflux gas and the action of the gravity of the moving sleeve and the adjustment plate, so that the adjustment plate can be finely moved back and forth, reducing the probability of nitrogen oxide generation and increasing the life of the burner.

[0038] At the same time, when the thrusts of the gas on both sides of the sliding part on the adjustment plate are different, the adjustment plate will be pushed to tilt, that is, the larger thrust pushes the adjustment plate to rotate away from the gas nozzle and increase the size of the adjustment cavity here, so that the gas overflows through the adjustment cavity, while the smaller thrust pushes the adjustment plate to rotate close to the gas nozzle and reduce the size of the adjustment cavity here, reducing the moving flow, thereby further improving the flow effect of the gas, improving the mixing effect, reducing the generation of nitrogen oxides and increasing the life of the burner.

[0039] At the same time, the locking component increases the size of the locking space, and then the movable sleeve can be removed from the adjusting tube for replacement, and then the movable sleeve is put on the adjusting tube. The locking component reduces the size of the locking space, so that the movable sleeve slides on the adjusting groove and will not fall off, thereby greatly improving the adjustment effect of the adjusting plate, reducing the probability of nitrogen oxide generation and increasing the life of the burner.

[0040] Optionally, the locking assembly includes:

[0041] A plurality of locking plates are arranged in a circular array around the axis of the moving sleeve and are slidably arranged on the moving sleeve along the radial direction of the moving sleeve. A ball is rotatably mounted on the side wall of each locking plate close to the adjusting groove, and the locking space is formed by the cooperation of the plurality of balls.

[0042] A plurality of locking screws are respectively arranged corresponding to the plurality of locking plates and are threadedly connected to the movable sleeve and rotatably connected to the locking plates.

[0043] By adopting the above technical solution, multiple locking screws are turned away from the adjusting slot, thereby driving multiple locking plates and rollers away from the adjusting slot, and then the movable sleeve can be pulled to be removed from the adjusting tube. During installation, the movable sleeve is put on the adjusting tube, so that the movable sleeve moves to the adjusting slot, and multiple locking screws are turned to push multiple locking plates close to the adjusting slot, and the locking screws are positioned against the locking plates, thereby realizing the replacement of the adjusting plates and the movable sleeve.

[0044] Optionally, a truncated cone-shaped guide surface is coaxially arranged on one side of the adjustment plate close to the conical mixer, and the diameter of the guide surface on the end close to the gas nozzle is smaller than the diameter on the end away from the gas nozzle; a plurality of guide blocks are spaced apart on the side wall of the adjustment plate close to the gas nozzle, and the plurality of guide blocks form a plurality of annular flow channels one and a plurality of flow channels two along the radial direction of the adjustment plate, the plurality of flow channels one are concentrically arranged with the adjustment plate and are connected with a plurality of flow channels two, and an overflow hole is provided on the adjustment plate which passes through the adjustment plate and is connected with flow channel one and / or flow channel two.

[0045] By adopting the above technical solution, the guide surface can guide the gas, and can guide the gas located on the side of the adjustment plate close to the gas nozzle into the adjustment chamber. At the same time, it can also guide the air ejected through the air nozzle hole into the side of the adjustment plate close to the gas nozzle, thereby greatly improving the gas mixing effect.

[0046] The mixed gas enters flow channel one and flow channel two for guidance, making the gas mixing more uniform, reducing the probability of the gas moving quickly to the adjustment chamber, allowing the gas to be better mixed, and part of the mixed gas can also be output through the vent hole, so that more gas enters flow channel one and flow channel two, thereby further improving the gas mixing effect, reducing the probability of nitrogen oxides generation and increasing the life of the burner.

[0047] Optionally, a flange for mounting the burner is provided on the shell, the support member passes through the gas input pipe and is connected to one end of the gas input pipe away from the gas nozzle, and an annular ventilation cavity connected to multiple gas nozzles is formed between the support member and the gas input pipe.

[0048] By adopting the above technical solution, the gas spray holes are arranged around the axis of the gas nozzle, that is, they are located on the circumferential side of the axis of the gas nozzle, and the support member passes through the gas input pipe and is connected to one end of the gas input pipe, that is, the support member occupies the central position of the gas input pipe, which greatly reduces the size of the ventilation cavity, so that the gas can move to the gas spray holes for spraying more quickly after being input, reducing the probability of the gas staying in the gas input pipe, making the gas and air mixture ratio closer to the required mixture ratio, and greatly improving the combustion effect of the burner.

[0049] Optionally, the shell is made of metal, and a ceramic sleeve is detachably mounted on the shell via a connecting assembly, and the honeycomb ceramic bricks and porous ceramic sheets are both arranged on the ceramic sleeve.

[0050] By adopting the above technical solution, the ceramic sleeve can be more resistant to high temperatures than metal, further improving the life of the burner. At the same time, the honeycomb ceramic bricks can be replaced, further improving the gas mixing effect, reducing the generation of nitrogen oxides and increasing the life of the burner.

[0051] In summary, the present application includes at least one of the following beneficial technical effects:

[0052] 1. Premixing is performed through the premixing mechanism, and the honeycomb ceramic bricks form a blocking effect to allow the gas to flow on its own. Finally, a certain buffer is formed through the equalizing pressure chamber, thereby further improving the mixing effect of the gas and air. In addition, the honeycomb ceramic bricks and the equalizing pressure chamber allow the mixed gas and air to flow in sections, reducing the probability of mixed gas being concentrated near the combustion point and prone to backfire, reducing the probability of nitrogen oxides generation and increasing the life of the burner.

[0053] 2. The heat conducted from the combustion point is absorbed in time by honeycomb ceramic bricks and porous ceramic sheets. The absorbed heat is used to preheat the mixed gas. The porous structures of both can make the air and gas mix with each other, making the mixture more uniform. At the same time, the porous medium and the gas therein undergo strong heat conduction, convection and radiation heat exchange with the outside world, making the internal temperature of the porous medium more uniform and the gas mixing more uniform, thereby further reducing the probability of nitrogen oxides generation and increasing the life of the burner. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 is a structural schematic diagram of a catalytic burner embodiment 1;

[0055] Figure 2 yes Figure 1 The enlarged schematic diagram of the middle A part, the arrows in the figure show the flow direction of the gas, air and mixed gas;

[0056] Figure 3 is a structural schematic diagram of a connecting mechanism in a second embodiment of a catalytic burner;

[0057] Figure 4 It is a structural schematic diagram of another connection mechanism in the second embodiment of the catalytic burner;

[0058] Figure 5 is a schematic structural diagram of a third embodiment of a catalytic burner;

[0059] Figure 6 is a schematic structural diagram of a fourth embodiment of a catalytic burner, with a side wall of a conical mixer cut away;

[0060] Figure 7 yes Figure 6 The enlarged schematic diagram of the middle B part;

[0061] Figure 8 is a schematic structural diagram of a fifth embodiment of a catalytic burner, with a side wall of a conical mixer cut away;

[0062] Fig. 9It is a schematic diagram of the structure of the locking assembly in the fifth embodiment of the catalytic burner, with the side wall of the movable sleeve being cut away.

[0063] Figure numerals: 1, shell; 11, air input pipe; 12, gas input pipe; 13, flange; 14, mounting hole 1; 15, mounting hole 2; 16, mounting plate; 17, fixing plate; 18, ventilation pipe; 19, ceramic sleeve; 191, limiting ring; 2, mixing device; 21, honeycomb ceramic brick; 22, porous ceramic sheet; 23, diversion channel; 24, ventilation hole; 25, equalizing chamber; 3, premixing mechanism; 31, conical mixer; 32, buffer ring; 33, gas nozzle; 34, adjusting plate; 35, air nozzle; 36, gas nozzle; 37, cover; 38, adjusting chamber; 39, guide surface; 4, connecting mechanism; 41, support member; 42, Sliding tube; 43, locking piece; 51, moving piece; 52, positioning plate; 53, positioning screw; 6, connecting assembly; 61, mounting ring; 62, fixing ring; 63, pressing ring; 64, pressing plate; 65, connecting screw; 66, connecting hole one; 67, connecting hole two; 68, sealing ring; 71, mounting sleeve; 72, spiral sheet; 73, driving sleeve; 74, driving hole; 75, blocking block; 81, adjusting tube; 82, adjusting groove; 83, moving sleeve; 84, locking space; 9, locking assembly; 91, locking plate; 92, locking screw; 93, ball; 94, locking groove; 95, guide block; 96, flow channel one; 97, flow channel two; 98, overflow hole. DETAILED DESCRIPTION

[0064] The following is combined with Figure 1-9 This application is described in further detail.

[0065] The embodiment of the present application discloses a catalytic burner. Example 1

[0066] Reference Figure 1 The catalytic burner comprises a shell 1, an air inlet pipe 11 and a gas inlet pipe 12 arranged on the shell 1, and a mixing device 2 for air and gas is also arranged on the shell 1.

[0067] The shell 1 is in the shape of a circular tube, and a flange 13 for installing a burner is coaxially fixedly installed on the outer wall of the shell 1; a mounting hole 14 is coaxially opened on the inner wall of one end of the shell 1, and a mounting hole 2 15 is coaxially opened on the inner wall of the other end of the shell 1, and the mounting hole 2 15 extends to the vicinity of the mounting hole 14, and a mounting plate 16 is coaxially fixedly installed on the outer wall of the shell 1 away from the mounting hole 14; the air inlet pipe 11 is fixedly installed on the end of the shell 1 away from the mounting hole 14, and the axis of the air inlet pipe 11 is perpendicular to the axis of the shell 1 and communicated with the shell 1, so as to realize the air transportation; the gas inlet pipe 12 is coaxially arranged with the shell 1 and the outer diameter is smaller than the inner diameter of the shell 1, and a fixing plate 17 is coaxially fixedly installed on the outer wall of the gas inlet pipe 12, and the fixing plate 17 and the mounting plate 16 are detachably connected by a screw and a nut, and one end of the gas inlet pipe 12 extends into the shell 1 and the other end is located outside the shell 1.

[0068] The mixing device 2 includes a honeycomb ceramic brick 21, a porous ceramic sheet 22 and a premixing mechanism 3. The honeycomb ceramic brick 21 is coaxially arranged with the shell 1, and the honeycomb ceramic brick 21 is slidably mounted on the mounting hole 2 15 and rests on one end of the mounting hole 2 15 close to the mounting hole 1 14 for positioning. A plurality of diversion channels 23 are formed on the honeycomb ceramic brick 21 along the axis of the shell 1 and penetrate the honeycomb ceramic brick 21, and the diversion channels 23 are for gas to pass through; the porous ceramic sheet 22 is fixedly mounted on the mounting hole 14, and the porous ceramic sheet 22 is flush with the shell 1, and at the same time, a plurality of ventilation holes 24 for gas to pass through are evenly opened on the porous ceramic sheet 22, the aperture of the diversion channel 23 is smaller than the diameter of the ventilation hole 24, and the array density of the diversion channel 23 is greater than the array density of the ventilation hole 24, and the thickness of the honeycomb ceramic brick 21 is greater than the thickness of the porous ceramic sheet 22.

[0069] The porous ceramic sheet 22 and the honeycomb ceramic brick 21 cooperate with the shell 1 to form an equalizing chamber 25. The premixing mechanism 3 is located on the side of the porous ceramic sheet 22 and the honeycomb ceramic brick 21 close to the gas input pipe 12. The gas input pipe 12 inputs gas and the air input pipe 11 inputs air into the premixing mechanism 3 for mixing, and then the mixed gas moves to the honeycomb ceramic brick 21. Since the number of diversion channels 23 is large and the length is long, a certain blocking effect is formed on the gas, so that the gas stays at the honeycomb ceramic brick 21. Therefore, if the gas is not mixed evenly, a pressure difference will be formed, so that the gas moves from the high pressure to the low pressure, thereby realizing fluid self-balance and improving the gas mixing effect.

[0070] The gas moves to the equalizing chamber 25 for buffering after passing through the diversion channel 23. At this time, when the gas is unevenly mixed and a pressure difference is formed, the gas can continue to flow, thereby further improving the mixing effect. Finally, the mixed gas is output through the vent 24 for combustion; the honeycomb ceramic bricks 21 and the porous ceramic sheets 22 have their own characteristics that can absorb the heat conducted from the combustion point, and then use the absorbed heat to preheat the passing gas, and can also reduce the heat conducted to the premixing mechanism 3. Since the gas of the premixing mechanism 3 is concentrated in one place, the risk of ignition or even explosion of the gas in the premixing mechanism 3 due to the heat is reduced, the generation of nitrogen oxides is reduced and the life of the burner is increased.

[0071] Reference Figure 1 and Figure 2 The premixing mechanism 3 includes a conical mixer 31, a buffer ring 32, a gas nozzle 33, and an adjusting plate 34. The conical mixer 31 is conical and is coaxially arranged with the shell 1 and has a shell 1 structure. The diameter of the conical mixer 31 close to the honeycomb ceramic brick 21 is larger than the diameter of the end away from the honeycomb ceramic brick 21, and the maximum outer diameter of the conical mixer 31 is the same as the diameter of the mounting hole 215. A plurality of air spray holes 35 are evenly opened on the outer wall of the conical mixer 31 along the radial and axial directions of the conical mixer 31. The air spray holes 35 are for air to enter the conical mixer 31.

[0072] The buffer ring 32 is slidably installed on the second mounting hole 15, and the buffer ring 32 is coaxially arranged with the shell 1, and the conical mixer 31 pushes the buffer ring 32 to rest against the honeycomb ceramic brick 21 for positioning; the inner diameter of the buffer ring 32 is greater than or equal to the maximum inner diameter of the conical mixer 31, and a plurality of diversion channels 23 are located on the inner side of the buffer ring 32, and the function of the buffer ring 32 is the same as that of the equalizing chamber 25, and the buffer ring 32 is used to buffer the premixed gas and to provide a larger space for the premixed gas to flow between gases, so as to make the gas mixing more uniform.

[0073] The gas nozzle 33 is coaxially fixedly installed on the end of the conical mixer 31 away from the buffer ring 32, and the maximum outer diameter of the gas nozzle 33 is the same as the minimum outer diameter of the conical mixer 31. A plurality of gas nozzles 36 that penetrate both ends of the gas nozzle 33 are arranged in a circular array around the axis of the gas nozzle 33. The gas nozzles 36 are in an inclined state, and the distance between the end close to the conical mixer 31 and the axis of the gas nozzle 33 is greater than the distance between the end away from the conical mixer 31 and the axis of the gas nozzle 33, so that the gas moves away from the center of the conical mixer 31 after being ejected.

[0074] One end of the gas inlet pipe 12 located inside the shell 1 is plugged into the outer side wall of the gas nozzle 33, and a sealing cover 37 for sealing the gas inlet pipe 12 is fixedly installed on the end of the gas inlet pipe 12 located outside the shell 1, and a vent pipe 18 is fixedly installed on the outer side wall of the end of the gas inlet pipe 12 located outside the shell 1. The vent pipe 18 is used to pass the gas into the gas inlet pipe 12, and then the gas is sprayed into the conical mixer 31 through the gas spray hole 36. The gas inlet pipe 12 and the gas nozzle 33 separate the space inside the shell 1, so that air flows in the space between the shell 1 and the gas inlet pipe 12, and finally the air is sprayed out through the air spray hole 35 to mix with the gas.

[0075] The adjusting plate 34 is coaxially arranged on one end of the gas nozzle 33 close to the conical mixer 31 through the connecting mechanism 4, and the connecting mechanism 4 can block the gas from moving toward the center of the conical mixer 31. The adjusting plate 34 is used to block the gas flow and is disc-shaped and coaxially arranged with the conical mixer 31. An adjusting cavity 38 for gas to pass through is formed between the outer wall of the adjusting plate 34 and the inner wall of the conical mixer 31. At the same time, the conical mixer 31 is conical, and the connecting mechanism 4 is used to move the adjusting plate 34 axially along the conical mixer 31 to adjust the position, so that the size of the adjusting cavity 38 can be adjusted.

[0076] The air is ejected through the air nozzle 35 and moves toward the center of the conical mixer 31, and the gas is ejected through the gas nozzle 36 to mix with the air. The gas contacts the connecting mechanism 4 to form a barrier, and the adjusting plate 34 blocks the gas in the space between the adjusting plate 34 and the gas nozzle 33, so that the gas can form a mixed flow in this space. Finally, the mixed gas moves forward through the adjusting chamber 38, and the gas passing through the adjusting chamber 38 can continue to mix with the air ejected through the air nozzle 35, thereby improving the mixing effect. At the same time, when it is necessary to adjust the mixing effect or different types of gas and air require different mixing ratios, the connecting mechanism 4 adjusts the position of the adjusting plate 34 to adjust the size of the adjusting chamber 38, so that a better mixing effect can be achieved under different requirements.

[0077] The connecting mechanism 4 includes a support member 41, a sliding tube 42, and a locking member 43. The support member 41 is coaxially fixedly installed on the gas nozzle 33, and the support member 41 can adopt an internal hollow tube body; one end of the support member 41 coaxially passes through the gas input pipe 12 and is fixedly connected to the cover 37, and the other end of the support member 41 extends into the conical mixer 31, so that the gas spray hole 36 is located on the side of the support member 41, and the support member 41 occupies the space at the center of the gas input pipe 12. The support member 41 and the gas input pipe 12 cooperate to form an annular ventilation cavity, and the ventilation cavity connects the ventilation pipe 18 and the gas spray hole 36. Therefore, under the condition of being connected with the gas spray hole 36, the annular ventilation cavity can greatly reduce the probability of gas staying in the gas input pipe 12, so that the gas can be sprayed out through the gas spray hole 36 as soon as possible for mixing, thereby improving the convenience and accuracy of flow control during gas input, making the gas mixing closer to the optimal mixing ratio, and reducing the probability of nitrogen oxide generation.

[0078] The sliding sleeve of the sliding tube 42 is arranged on the outer wall of the support member 41, and the adjustment plate 34 is coaxially arranged on the outer wall of the sliding tube 42 at one end close to the gas nozzle 33. The locking member 43 is used to lock the position of the sliding tube 42. The locking member 43 can be a hexagon socket screw. The locking member 43 is threadedly connected to the sliding tube 42 and pressed against the outer wall of the support member 41 for fixing.

[0079] The working principle of the embodiment of the present application is as follows:

[0080] The gas enters the conical mixer 31 through the gas input pipe 12 and the gas nozzle 36, and the air enters the conical mixer 31 through the air input pipe 11 and the air nozzle 35 for premixing. The mixed gas moves toward the center of the conical mixer 31. After the mixed gas contacts the support 41, a blocking effect is generated, so that the gas moves back away from the center of the conical mixer 31. At the same time, the adjustment plate 34 can block the passage of the gas, so that the gas flow is mixed, thereby improving the mixing effect. Then the gas moves to the buffer ring 32 through the adjustment cavity 38 for buffering. The gas passes through the diversion channel 23 on the honeycomb ceramic brick 21. The diversion channel 23 is long and densely arranged, so as to form a certain barrier to the gas. The gas can continue to flow and mix in the buffer ring 32, so that the mixing effect is better. The gas moves to the equalizing chamber 25 to continue to flow and mix. Finally, the gas is output through the vent 24 for combustion, thereby improving the mixing effect of the gas. In addition, the honeycomb ceramic bricks 21 and the porous ceramic sheets 22 can absorb the heat conducted from the combustion point, which is used to preheat the premixed gas. At the same time, they can also block the probability of heat being conducted to the premixing mechanism 3, which makes the gas burn or even explode, thereby reducing the probability of nitrogen oxides generation and increasing the life of the burner. Example 2

[0081] Reference Figure 1 and Figure 3 The difference between this embodiment and embodiment 1 is that a ceramic sleeve 19 is detachably mounted on one end of the shell 1 away from the mounting plate 16 through a connecting assembly 6. The ceramic sleeve 19 is made of ceramic. Compared with metal, the ceramic sleeve 19 can better achieve high temperature resistance during burner combustion. The mounting hole 14 and the mounting hole 2 15 are opened on the ceramic sleeve 19, and the inner diameter of the ceramic sleeve 19 is the same as the inner diameter of the shell 1. At the same time, a limit ring 191 is coaxially arranged on the ceramic sleeve 19 close to one end of the shell 1.

[0082] Reference Figure 3 and Figure 4 The connecting assembly 6 includes a mounting ring 61, a fixing ring 62 and a pressing ring 63. The mounting ring 61 is coaxially arranged on the outer wall of the shell 1 close to the ceramic sleeve 19. The fixing ring 62 is threadedly connected to the outer wall of the mounting ring 61, and the inner diameter is larger than the outer diameter of the limiting ring 191; the pressing ring 63 is coaxially and integrally arranged on the inner wall of the fixing ring 62, and the inner diameter of the pressing ring 63 is larger than the outer diameter of the ceramic sleeve 19 and smaller than the outer diameter of the limiting ring 191; the pressing ring 63 is sleeved on the ceramic sleeve 19, and the fixing ring 62 is threadedly connected to the mounting ring 61, so that the pressing ring 63 pushes the limiting ring 191 to press against the mounting ring 61 to achieve connection.

[0083] Alternatively, the flange 13 is located on one end of the shell 1 close to the ceramic sleeve 19, and the connecting assembly 6 includes a pressure plate 64 and a connecting screw 65. A connecting hole 1 66 is coaxially opened on the flange 13, and a connecting hole 2 67 is coaxially opened on the connecting hole 1 66. The diameter of the connecting hole 2 67 is smaller than the diameter of the connecting hole 1 66, and the limiting ring 191 is plugged into the connecting hole 2 67; the pressure plate 64 is annular and is plugged into the connecting hole 1 66, and the connecting screw 65 passes through the pressure plate 64 and is threadedly connected to the flange 13, so that the pressure plate 64 is pressed against the limiting ring 191 for positioning, thereby realizing the connection of the ceramic sleeve 19.

[0084] A sealing ring 68 for sealing and capable of withstanding high temperatures is provided between the limiting ring 191 and the mounting ring 61 and between the limiting ring 191 and the second connecting hole 67 .

[0085] The working principle of the embodiment of the present application is as follows:

[0086] The ceramic sleeve 19 can be replaced by unlocking the connecting assembly 6, and the ceramic sleeve 19 can improve the high temperature resistance of the burner, thereby further improving the life of the burner. Example 3

[0087] Reference Figure 1 and Figure 5The difference between this embodiment and embodiment 1 is that the connecting mechanism 4 includes a moving part 51, a positioning plate 52 and a positioning screw 53. The moving part 51 is a hollow tube body. The moving part 51 is coaxially slidably penetrated on the gas nozzle 33, and the outer diameter of the moving part 51 is the same as the outer diameter of the support part 41. At the same time, the moving part 51 also coaxially passes through the gas input pipe 12 and is slidably penetrated on the cover 37. The cover 37 is provided with a sealing hole that slides with the moving part 51, and a moving groove is provided on the side wall of the sealing hole. The adjusting plate 34 is coaxially fixedly installed on the moving part 51 located in the conical mixer 31; the positioning plate 52 is slidably installed on the moving groove, and the positioning screw 53 is threadedly connected to the cover 37 and pushes the positioning plate 52 to press against the moving part 51 for positioning.

[0088] The working principle of the embodiment of the present application is as follows:

[0089] When adjustment is required, the positioning screw 53 is turned away from the positioning plate 52, thereby unlocking the lock of the movable part 51, and the movable part 51 moves to drive the adjustment plate 34 to move, so as to adjust the size of the adjustment chamber 38. After the adjustment is completed, the positioning screw 53 is turned to push the positioning plate 52 to press against the movable part 51 for positioning, so as to adjust the position of the adjustment plate 34. Moreover, the movable part 51 and the positioning screw 53 are both located on the outside of the shell 1. Therefore, the position of the adjustment plate 34 can be adjusted without disassembling the burner, and it can even be adjusted during the combustion process of the burner, so that the position adjustment effect of the adjustment plate 34 is better and more convenient, further reducing the probability of nitrogen oxides generation and increasing the life of the burner. Example 4

[0090] Reference Figure 6 and Figure 7 The difference between this embodiment and embodiment 3 is that a mounting sleeve 71 is coaxially installed on the moving member 51, and a screw is threadedly connected to the mounting sleeve 71. The screw abuts against the moving member 51 for positioning, and the screw head is located in the mounting sleeve 71; a spiral piece 72 is coaxially fixedly installed on the mounting sleeve 71, and a plurality of spiral pieces 72 are arranged in a circular array around the axis of the mounting sleeve 71. At the same time, the diameter of the spiral piece 72 gradually increases along the axis of the moving member 51, and the diameter of the spiral piece 72 is the largest at the end away from the gas nozzle 33.

[0091] A driving sleeve 73 is provided on the multiple spiral pieces 72. The inner diameter of the driving sleeve 73 is larger than the outer diameter of the mounting sleeve 71 and the two are coaxially arranged. A plurality of driving holes 74 corresponding to the multiple spiral pieces 72 are opened on the driving sleeve 73. The multiple driving holes 74 are spiral and allow the multiple spiral pieces 72 to pass through; the diameter of the driving hole 74 is larger than the minimum diameter of the spiral piece 72 and smaller than the maximum diameter of the spiral piece 72. The driving sleeve 73 is fixedly installed with a blocking block 75 at the end with the smallest diameter of the spiral piece 72. The blocking block 75 is elastic and prevents the driving sleeve 73 from falling off the spiral piece 72; when replacement is needed, the driving sleeve 73 can be pushed to move and squeeze the blocking block 75 to remove the driving sleeve 73. When installing, the blocking block 75 can be squeezed to make the spiral piece 72 pass through the driving hole 74, so that the driving sleeve 73 can be installed on the multiple spiral pieces 72.

[0092] The adjusting plate 34 is coaxially fixedly mounted on the outer wall of the driving sleeve 73, and after the thrust of the gas on the adjusting plate 34 increases, the gas pushes the adjusting plate 34 and the driving sleeve 73 to overcome the friction and move. At the same time, under the action of the driving hole 74 and the spiral piece 72, the adjusting plate 34 moves and rotates. The rotation and movement of the adjusting plate 34 will increase the size of the adjusting chamber 38, so that the gas overflows through the adjusting chamber 38 and the pressure is reduced. At the same time, as the driving sleeve 73 rotates and moves, the diameter of the spiral piece 72 gradually increases, and the contact area between the spiral piece 72 and the driving hole 74 gradually increases. Therefore, the resistance to the rotation and movement of the driving sleeve 73 gradually increases, thereby maintaining the stable state of the adjusting plate 34, and the force pushing the driving sleeve 73 away from the gas nozzle 33 is greater than the force of the driving sleeve 73 approaching the gas nozzle 33; at the same time, the partial gas back movement can also push the adjusting plate 34 to rotate and move back, thereby reducing the size of the adjusting chamber 38, so that the size of the adjusting chamber 38 can be fine-tuned according to the gas pressure, thereby further improving the gas mixing effect.

[0093] The working principle of the embodiment of the present application is as follows:

[0094] The increase in gas pressure between the adjustment plate 34 and the gas nozzle 33 will push the adjustment plate 34 and the drive sleeve 73 to overcome the friction and move, thereby increasing the size of the adjustment chamber 38. Therefore, the gas overflows through the adjustment chamber 38 and reduces the gas pressure. At the same time, as the adjustment plate 34 rotates, the resistance to the adjustment plate 34 increases, causing the adjustment plate 34 to stop rotating and moving. Moreover, when the gas pressure moves back to the side of the adjustment plate 34 away from the gas nozzle 33, the increase will also push the adjustment plate 34 to move back, so that the size of the adjustment chamber 38 can be fine-tuned according to the gas pressure, thereby further improving the gas mixing effect, further reducing the probability of nitrogen oxide generation and increasing the life of the burner. Example 5

[0095] Reference Figure 8 and Fig. 9The difference between this embodiment and embodiment 3 is that an adjusting tube 81 is coaxially installed on the moving member 51, and a screw is threadedly connected on the adjusting tube 81, the screw abuts on the moving member 51 for positioning, and the screw head is located in the adjusting tube 81; an adjusting groove 82 is coaxially opened on the adjusting tube 81, and the diameter of the adjusting groove 82 gradually increases from the middle position to the two ends, and the diameters of the two ends of the adjusting groove 82 are the same; a moving sleeve 83 is slidably installed on the adjusting groove 82 through a locking component 9, and the adjusting plate 34 is coaxially fixedly installed on the outer wall of the moving sleeve 83, and the locking component 9 forms a circular locking space 84 that coincides with the axis of the adjusting groove 82 and can be adjusted. When the moving sleeve 83 slides on the adjusting groove 82, the diameter of the locking space 84 is greater than the minimum diameter of the adjusting groove 82 and smaller than the maximum diameter of the adjusting groove 82.

[0096] The locking assembly 9 includes multiple locking plates 91 and multiple locking screws 92. A multiple locking grooves 94 are arranged in a circular array around the axis of the moving sleeve 83 on the inner wall of the moving sleeve 83; the multiple locking plates 91 are arranged in a one-to-one correspondence with the multiple locking grooves 94, and the locking plates 91 are radially slidably installed on the locking grooves 94 along the moving sleeve 83. Balls 93 are rotatably installed on the side walls of the locking plates 91 close to the adjusting grooves 82, and the locking space 84 is formed by the cooperation of the balls 93 located on the multiple locking plates 91; the multiple locking screws 92 are arranged in a one-to-one correspondence with the multiple locking plates 91, and the locking screws 92 are threadedly connected to the outer wall of the moving sleeve 83, and the locking screws 92 extend into the locking grooves 94 and are rotatably connected to the locking plates 91.

[0097] When the movable sleeve 83 slides on the adjusting groove 82, multiple locking screws 92 press against the outer wall of the movable sleeve 83 for positioning. At this time, multiple balls 93 cooperate to form a locking space 84 with a diameter larger than the minimum diameter of the adjusting groove 82 and smaller than the maximum diameter. When the movable sleeve 83 needs to be removed, the locking screws 92 are turned to drive the locking plate 91 away from the adjusting groove 82, thereby increasing the size of the locking space 84, and then the movable sleeve 83 can be removed from the adjusting tube 81.

[0098] The locking assembly 9 is located on one side of the adjusting plate 34, and the function of the locking assembly 9 is that when the burner is repaired, the movable part 51 is removed from the positioning plate 52 for adjustment, and then the movable sleeve 83 can be removed for replacement; or, during assembly, the movable sleeve 83 is first installed on the adjusting tube 81, and the locking assembly 9 is adjusted to reduce the locking space 84 to prevent the movable sleeve 83 from falling from the adjusting tube 81. At other times, the locking assembly 9 is not used for adjustment.

[0099] The adjusting tube 81 is made of metal, so that the roughness of the adjusting groove 82 is relatively low, and the roughness can meet the design requirements. At the same time, the design of the ball 93 can further reduce the resistance of the moving sleeve 83 when moving; the moving sleeve 83 is slidably installed on the adjusting groove 82, and the moving sleeve 83 is initially located in the middle position of the adjusting groove 82.

[0100] When the thrust of the gas on the adjusting plate 34 increases, the adjusting plate 34 will be pushed to move. The movement of the adjusting plate 34 can increase the size of the adjusting chamber 38, so that the gas overflows through the adjusting chamber 38 and reduces the gas pressure, which makes the thrust of the gas on the adjusting plate 34 smaller. Moreover, as the diameter of the moving sleeve 83 moves, it gradually increases, that is, the resistance to pushing the adjusting plate 34 increases, so that the adjusting plate 34 remains in a stable state.

[0101] At the same time, when the gas located on the side of the adjustment plate 34 away from the gas nozzle 33 moves back and pushes the adjustment plate 34, the adjustment plate 34 moves toward the middle of the adjustment groove 82 under the action of the back thrust and the weight of the adjustment plate 34 itself, thereby reducing the size of the adjustment chamber 38. Therefore, the size of the adjustment chamber 38 can be automatically adjusted according to the gas pressure, so as to adapt to it and greatly improve the mixing effect of the gas; and when the gas further increases the retreat force on the adjustment plate 34, it can continue to push the adjustment plate 34 toward the gas nozzle 33, further reducing the size of the adjustment chamber 38, so that the gas entering the side of the adjustment plate 34 away from the gas nozzle 33 is reduced, thereby further improving the adjustment effect.

[0102] A truncated cone-shaped guide surface 39 is coaxially and integrally provided on the outer wall of the adjustment plate 34, and the diameter of the guide surface 39 on the side close to the gas nozzle 33 is smaller than the diameter on the side away from the gas nozzle 33. The guide surface 39 is used to introduce the gas located on the side of the adjustment plate 34 close to the gas nozzle 33 into the adjustment chamber 38, and can also introduce the air passing through the air nozzle 35 into the side of the adjustment plate 34 close to the gas nozzle 33.

[0103] A guide block 95 is fixedly installed on the side wall of the adjustment plate 34 close to the gas nozzle 33. A plurality of guide blocks 95 are arranged at intervals along the radial and axial directions of the adjustment plate 34. The plurality of guide blocks 95 form an annular flow channel 1 96 and a flow channel 2 97 along the radial direction of the adjustment plate 34. The plurality of flow channels 1 96 are arranged concentrically with the adjustment plate 34 and have gradually changing diameters and are connected with the plurality of flow channels 1 96. The adjustment plate 34 is provided with overflow holes 98 on the opposite side walls of the adjustment plate 34 along the axis of the adjustment plate 34, and the overflow holes 98 are connected with the flow channel 1 96 and / or the flow channel 2 97.

[0104] The gas enters flow channel 1 96 and flow channel 2 97 for flow mixing, and the guide block 95 can block the gas from moving toward the regulating chamber 38, so that the gas can be mixed faster. At the same time, the aperture and arrangement density of the overflow holes 98 can be designed as needed, so that the gas flows toward the overflow holes 98 and mixes before being output through the overflow holes 98.

[0105] The working principle of the embodiment of the present application is as follows:

[0106] When the thrust of the gas on the adjustment plate 34 increases, the adjustment plate 34 will be pushed to move, thereby increasing the size of the adjustment chamber 38, so that the gas overflows through the adjustment chamber 38 and the thrust on the adjustment plate 34 becomes smaller. At the same time, as the adjustment plate 34 moves, the resistance to the adjustment plate 34 becomes larger, so that the adjustment plate 34 maintains a stable state. At the same time, when the gas located on the side of the adjustment plate 34 away from the gas nozzle 33 moves back to push the adjustment plate 34, the adjustment plate 34 moves toward the middle of the adjustment groove 82 under the action of the back thrust and the weight of the adjustment plate 34 itself, thereby reducing the size of the adjustment chamber 38. Therefore, the size of the adjustment chamber 38 can be automatically adjusted according to the gas pressure, so as to adapt itself and greatly improve the mixing effect of the gas.

[0107] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A catalytic burner, characterized in that: The invention comprises a housing (1), an air inlet pipe (11) and a gas inlet pipe (12) arranged on the housing (1), wherein a mixing device (2) for mixing air and gas is arranged on the housing (1), and the mixing device (2) comprises: A honeycomb ceramic brick (21) is arranged in the housing (1) and is evenly provided with a plurality of flow diversion channels (23) for gas to pass through; A porous ceramic sheet (22) is arranged on the shell (1) and is evenly provided with a plurality of vent holes (24) for gas to pass through; the thickness of the honeycomb ceramic brick (21) is greater than the thickness of the porous ceramic sheet (22); the porous ceramic sheet (22), the honeycomb ceramic brick (21) and the shell (1) cooperate to form a pressure equalizing chamber (25); A premixing mechanism (3) for premixing input air and fuel gas, so that the premixed gas passes through the honeycomb ceramic brick (21), the pressure equalizing chamber (25) and the porous ceramic sheet (22) in sequence; The premixing mechanism (3) comprises: A conical mixer (31) is arranged in the housing (1) and is conical in shape. The diameter of the conical mixer (31) at one end close to the honeycomb ceramic brick (21) is larger than the diameter of the end away from the honeycomb ceramic brick (21). A plurality of air spray holes (35) are provided along the axial direction and radial direction of the conical mixer (31). The air spray holes (35) are connected to the air input pipe (11) and allow air to pass through and enter the conical mixer (31). a buffer ring (32) disposed in the housing (1) and resting against the opposite end of the honeycomb ceramic brick (21) and the conical mixer (31), and having an inner diameter greater than or equal to the maximum inner diameter of the conical mixer (31); the plurality of flow diversion channels (23) being located inside the buffer ring (32); A gas nozzle (33) is coaxially arranged on an end of the conical mixer (31) away from the buffer ring (32) and is in communication with the gas input pipe (12); the gas nozzle (33) is provided with a plurality of gas injection holes (36) spaced axially around the conical mixer (31) for supplying gas into the conical mixer (31); an adjusting plate (34) in an annular shape and coaxially arranged on the gas nozzle (33) via a connecting mechanism (4); the adjusting plate (34) is used to block and adjust the gas and cooperates with the inner wall of the conical mixer (31) to form an adjusting cavity (38) for gas to pass through; the connecting mechanism (4) is used to adjust the position of the adjusting plate (34) along the axial direction of the gas nozzle (33); The connecting mechanism (4) comprises: A support member (41) is coaxially arranged on the gas nozzle (33) and extends into the conical mixer (31); A sliding tube (42) is arranged on the adjustment plate (34) and a sliding sleeve is arranged on the support member (41); A locking member (43) disposed on the sliding tube (42) and used to position the sliding tube (42); Alternatively, the connecting mechanism (4) comprises: A moving member (51) is coaxially slidably disposed on the gas nozzle (33), and the adjustment plate (34) is disposed on the moving member (51); A positioning plate (52) slidably disposed on the moving member (51); The positioning screw (53) is threadedly connected to the gas input pipe (12) and pushes the positioning plate (52) to press against the moving part (51) for positioning.

2. A catalytic burner according to claim 1, characterized in that: The movable member (51) is coaxially provided with a mounting sleeve (71) that can be detached therefrom. A plurality of spiral pieces (72) are coaxially provided thereon. The diameter of the spiral pieces (72) gradually increases along the axis of the movable member (51) and is the largest at one end close to the honeycomb ceramic brick (21). A driving sleeve (73) is provided on the plurality of spiral pieces (72). The driving sleeve (73) is provided with a driving hole (74) for the plurality of spiral pieces (72) to pass through and having a diameter greater than the minimum diameter of the spiral pieces (72) and less than the maximum diameter of the spiral pieces (72). The regulating plate (34) is provided on the driving sleeve (73) and moves and rotates along the axis of the movable member (51) under the push of gas and the action of the plurality of spiral pieces (72). The movable member (51) is provided with a blocking block (75) that is elastic and used to prevent the driving sleeve (73) from being separated from the spiral pieces (72).

3. A catalytic burner according to claim 1, characterized in that: An adjusting tube (81) is coaxially and detachably provided on the movable member (51), an adjusting groove (82) is coaxially provided on the outer wall of the adjusting tube (81), the diameter of the adjusting groove (82) gradually increases from the middle position to both ends and the diameters of both ends are the same, a moving sleeve (83) connected to the adjusting plate (34) is slidably mounted on the adjusting groove (82) via a locking assembly (9), the locking assembly (9) forms a circular locking space (84) that coincides with the axis of the adjusting groove (82) and can adjust the size, and when the moving sleeve (83) slides on the adjusting groove (82), the diameter of the locking space (84) is larger than the minimum diameter of the adjusting groove (82) and smaller than the maximum diameter of the adjusting groove (82).

4. A catalytic burner according to claim 3, characterized in that: The locking assembly (9) comprises: A plurality of locking plates (91) are arranged in a circular array around the axis of the moving sleeve (83) and are radially slidably arranged on the moving sleeve (83). A ball (93) is rotatably mounted on a side wall of each locking plate (91) close to the adjustment groove (82). The locking space (84) is formed by the cooperation of the plurality of ball bearings (93); A plurality of locking screws (92) are respectively arranged corresponding to the plurality of locking plates (91), are threadedly connected to the moving sleeve (83), and are rotatably connected to the locking plates (91).

5. A catalytic burner according to claim 3, characterized in that: A truncated cone-shaped guide surface (39) is coaxially arranged on one side of the regulating plate (34) close to the conical mixer (31); the diameter of the guide surface (39) at one end close to the gas nozzle (33) is smaller than the diameter of the end away from the gas nozzle (33); a plurality of guide blocks (95) are arranged at intervals on the side wall of the regulating plate (34) close to the gas nozzle (33); the plurality of guide blocks (95) form a plurality of annular flow channels (96) and a plurality of flow channels (97) along the radial direction of the regulating plate (34); the plurality of flow channels (96) are arranged concentrically with the regulating plate (34) and are connected to the plurality of flow channels (97); and an overflow hole (98) is provided on the regulating plate (34) and passes through the regulating plate (34) and is connected to the flow channel (96) and / or the flow channel (97).

6. A catalytic burner according to claim 1, characterized in that: The housing (1) is provided with a flange (13) for mounting a burner, the support member (41) passes through the gas input pipe (12) and is connected to an end of the gas input pipe (12) away from the gas nozzle (33), and an annular ventilation cavity is formed between the support member (41) and the gas input pipe (12) and is connected to a plurality of gas nozzle holes (36).

7. A catalytic burner according to claim 1, characterized in that: The shell (1) is made of metal, and a ceramic sleeve (19) is detachably mounted on the shell (1) via a connecting assembly (6), and the honeycomb ceramic brick (21) and the porous ceramic sheet (22) are both arranged on the ceramic sleeve (19).

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