A small charged spray burner

Abstract

A small charged spray burner includes a combustion chamber with a heat exchange sleeve provided with multiple air inlets on the outside, an atomizing chamber inside the combustion chamber, an outer sleeve provided with multiple exhaust ports on the top end, an inner sleeve, and a base. The top end of the outer sleeve is sealed by the fuel supply tank base, and the bottom end of the outer sleeve is sealed by the base. The hollow part of the inner sleeve forms a vertical flue. The inner side wall of the atomizing chamber is provided with a multi-nozzle injector that communicates with the fuel supply tank through the fuel supply tank base on the top end. The multi-nozzle injector includes multiple nozzles fixed to the inner side wall of the atomizing chamber and located in the vertical flue formed by the hollow part of the inner sleeve. A rotating circular plate with a porous medium is arranged in the combustion chamber, as well as a heat exchange circular plate with a metal grid. The outermost side of the rotating circular plate is inserted into the bottom part of the combustion chamber as a baffle. The rotating porous medium is used to strengthen heat transfer, the structure is reasonable, the combustion efficiency is high, the air and liquid fuel can be fully preheated at the same time, and the mixing speed of the fuel and air is fast.

Description

Technical Field

[0001] This invention relates to liquid fuel combustion technology, and in particular to a small charged spray burner. Background Technology

[0002] Liquid fuels are typically atomized before combustion, breaking them down into smaller droplets that increase their surface area by thousands of times, thus facilitating rapid and efficient combustion. Electrostatic atomization produces even smaller droplet sizes than traditional atomization methods and effectively organizes combustion through an electric field. Existing coaxial single-nozzle systems have low fuel flow rates and low power output for the same volume. While solid multi-nozzle systems offer higher fuel flow rates, insufficient fuel preheating prevents rapid evaporation after atomization, leading to a decrease in flame temperature. Traditional small burners often employ a regenerated exhaust system with the exhaust channel located on the outermost edge of the burner, resulting in insufficient reheating, significant heat loss, and high exhaust temperatures, leading to low combustion efficiency. Furthermore, traditional burners rely heavily on nozzle exit velocity and free diffusion for fuel-air mixing, which becomes slower and less efficient beyond a certain range. The porous media used in traditional burners are mostly horizontally arranged, which limits the range of fuel flow rates that can be accommodated. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a small charged spray burner.

[0004] The technical problem of the present invention is solved by the following technical solution.

[0005] This small charged spray burner includes a combustion chamber with a heat exchange sleeve having multiple air inlets on the outside, an atomizing chamber inside the combustion chamber, an outer sleeve with multiple exhaust ports at the top, an inner sleeve, and a base. The top of the outer sleeve is sealed by the fuel supply box base, and the bottom of the outer sleeve is sealed by the base. The hollow part of the inner sleeve forms a vertical flue, and the high-temperature flue gas can heat the inner wall of the atomizing chamber, thereby increasing the temperature of the atomizing chamber and enhancing the atomization effect.

[0006] The characteristics of this small charged spray burner are:

[0007] The inner wall of the atomizing chamber is provided with a multi-nozzle nozzle whose top end passes through the fuel supply box base and communicates with the fuel supply box. The multi-nozzle nozzle includes multiple nozzles fixed to the inner wall of the atomizing chamber and is located in the vertical flue formed by the hollow part of the inner sleeve.

[0008] The combustion chamber is equipped with a rotating circular plate with a porous medium and a heat exchange circular plate with a metal mesh. The outermost part of the rotating circular plate is inserted into the bottom of the combustion chamber as a baffle to prolong the residence time of the flue gas in the combustion chamber, which helps to stabilize combustion.

[0009] It is also equipped with a high-voltage DC power supply, the positive terminal of which is connected to the plurality of nozzles, and the negative terminal of which is connected to the metal mesh.

[0010] The porous medium and the metal mesh separate the combustion chamber from the atomization chamber. The top of the atomization chamber is sealed by a heat exchange circular plate, and the bottom of the atomization chamber is sealed by a rotating circular plate, forming a small charged spray burner with rotating porous medium. The rotating porous medium enhances heat transfer. Under the centrifugal force generated during rotation, the liquid fuel in the evaporation zone comes into full contact with the high-temperature flue gas in the combustion zone, accelerating the evaporation of the liquid fuel. The rotating porous medium can also entrain the air in the combustion chamber, accelerating its mixing with the fuel vapor and increasing the reaction rate. Furthermore, the rotating porous medium can effectively capture fuel droplets ejected from the nozzle, ensuring uniform distribution of the fuel droplets on the porous medium, which is suitable for high-flow-rate multi-nozzle nozzles.

[0011] The technical problem of the present invention is solved by the following further technical solutions.

[0012] The liquid inlet of the multi-nozzle nozzle is located at the top and inside the combustion supply box. The nozzles of the multi-nozzle nozzle are multi-layer nozzle groups, with multiple nozzles in each layer of the multi-layer nozzle group arranged at the same height and perpendicular to the axial direction of the multi-nozzle nozzle. These nozzles sequentially pass through the vertical flue, the inner sleeve, and the inner wall of the atomization chamber. Gravity-driven liquid feeding eliminates the need for a fuel supply pump, saving electricity. Furthermore, since each level of nozzle on the multi-nozzle nozzle passes through the vertical flue, it can fully preheat the fuel before it is ejected, increasing the fuel temperature within the atomization chamber, reducing viscosity, and enhancing atomization.

[0013] The gap between the heat exchange sleeve and the base forms a horizontal airflow channel, and the gap between the outer sleeve and the heat exchange sleeve forms a vertical airflow channel. The gap between the horizontal section of the heat exchange sleeve and the rotating circular plate forms a bottom horizontal flue, and the gap between the heat exchange circular plate and the fuel supply box base forms a top horizontal flue. The bottom and top horizontal flues are located inside the airflow channels. Air enters from the lower base and passes sequentially through the horizontal airflow channel formed by the heat exchange sleeve and the base, and the vertical airflow channel formed by the heat exchange sleeve and the outer sleeve, absorbing heat from the high-temperature flue gas to achieve a preheating effect, which is beneficial to stable combustion. The high-temperature flue gas fully exchanges heat with the air when passing through the bottom horizontal flue, fully exchanges heat with the liquid fuel in the multi-nozzle when passing through the vertical flue, and fully exchanges heat with the liquid fuel in the combustion supply box when passing through the top horizontal flue, maximizing the utilization of the residual heat of the high-temperature flue gas before being discharged.

[0014] The technical problem of the present invention is solved by the following further technical solution.

[0015] The rotating circular plate has two protrusions perpendicular to the plane of the plate, and there is a gap between the two protrusions. The porous medium is fixed to the rotating circular plate through the gap between the protrusions.

[0016] The rotating disc has an annular boss on its inner side, and the annular boss is sealed to the inner sleeve by a sealing material. The rotating disc has a vertical protrusion at the bottom of the combustion chamber.

[0017] The heat exchange circular plate has two protrusions perpendicular to the plane of the circular plate, and there is a specific shape interval between the two protrusions. The metal mesh plate is composed of a fixing plate with a top boss shape and a metal mesh. The fixing plate and the specific shape interval cooperate to fix the metal mesh plate on the heat exchange circular plate.

[0018] The surface of the metal mesh is coated with one of a Pt-Ni catalyst and a Pt-Cu catalyst.

[0019] An electric motor is located at the center of the base. The electric motor, together with the rotating sleeve and the rotating circular plate, forms a rotating component. The rotating sleeve is sealed to the base with a sealing material. The rotating sleeve is placed in reverse and has a flue gas inlet on its bottom wall.

[0020] The surface of the sealing material is coated with grease.

[0021] The vertical part of the heat exchange cylinder is provided with a multi-layer air inlet group. Each layer of the multi-layer air inlet group has four air inlets, which are perpendicular to the axis and symmetrically distributed at 90° intervals.

[0022] There is a gap between the porous medium and the heat exchange circular plate, and there is a gap between the metal mesh and the rotating circular plate.

[0023] It also includes an igniter, which is located on the outer side of the center of the metal mesh and is connected to an external power source via a lead wire.

[0024] The advantages of this invention compared to the prior art are:

[0025] This invention employs a rotating porous medium to enhance heat transfer, has a reasonable structure, high combustion efficiency, and can simultaneously preheat both air and liquid fuel, resulting in rapid fuel-air mixing. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0027] Figure 2 yes Figure 1 A cross-sectional view along the AA direction;

[0028] Figure 3 yes Figure 1 A cross-sectional view along the BB direction;

[0029] Figure 4 yes Figure 1 A cross-sectional view of the rotating component;

[0030] Figure 5 yes Figure 4 A three-dimensional view of the rotating sleeve;

[0031] Figure 6 yes Figure 1 A schematic diagram of the structure of a metal mesh plate.

[0032] Figures 1-6 The numbers in the text are marked as follows:

[0033] 1-Outer sleeve; 2-Airflow channel; 3-Heat exchange sleeve; 4-Atomization chamber; 5-Combustion chamber; 6-Igniter; 7-Metal mesh; 8-Rotating sleeve; 9-Porous medium; 10-Intake channel; 11-Motor; 12-Bottom horizontal flue; 13-Rotating circular plate; 14-Sealing ring; 15-Nozzle; 16-Multi-nozzle nozzle; 17-Inner sleeve; 18-Vertical flue; 19-High voltage DC power supply; 20-Fuel supply box; 21-Fuel supply box base; 22-Lead wire; 23-Base; 24-Fixing plate; 25-Heat exchange circular plate; 26-Exhaust port; 27-Top horizontal flue; 28-Intake port. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to specific embodiments and the accompanying drawings. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope or application of the present invention.

[0035] One such Figures 1-6 The small charged spray burner shown utilizes a rotating porous medium to enhance heat transfer and includes a combustion chamber 5 with a heat exchange sleeve 3 having multiple air inlets 28 on the outside, an atomizing chamber 4 inside the combustion chamber 5, an outer sleeve 1 with multiple exhaust ports 26 at the top, an inner sleeve 17, and a base 23.

[0036] The outer sleeve 1 has an outer diameter of Φ104mm, an inner diameter of Φ98mm, and a height of 54mm, and is made of high-temperature resistant insulation materials such as ceramic. The top of the outer sleeve has two semi-circular exhaust ports 26 with a diameter of Φ4mm. The top of the outer sleeve 1 is sealed by the fuel supply tank base 21, and the bottom of the outer sleeve is sealed by the base 23. The fuel supply tank 20 has an outer diameter of Φ118mm, an inner diameter of Φ114mm, and a height of 20mm. The base is 2mm thick and is made of a high-temperature resistant material with high thermal conductivity. The fuel supply tank base 21 has a through hole with a diameter of Φ6mm at its center.

[0037] The inner sleeve 17 has a height of 36mm, an outer diameter of Φ18mm, and an inner diameter of Φ16mm. The bottom inner diameter is 11mm, and the height is 1mm. It is made of a high-temperature resistant material with high thermal conductivity. Three layers of nozzle holes are arranged on the inner sleeve wall, spaced 10mm apart, with four nozzle holes in each layer, spaced at 90° intervals. The nozzle hole diameter is Φ1.5mm. The hollow portion of the inner sleeve 17 forms a vertical flue 18. The base 23 has an outer diameter of Φ120mm, and the inner diameter of the two side support legs is Φ106mm. The wall thickness is 4mm, and it is made of high-temperature resistant ceramic insulation material. An air intake channel with an outer diameter of Φ5mm and an inner diameter of Φ4mm is located 5mm from the axis; a through hole with a diameter of Φ12mm is located at the axis.

[0038] The base 23 has two air intake channels 10 on the axial side. Air enters the burner through the air intake channels 10, passes through the vertical air flow channel 2, and finally is ejected from the air intake port 28 into the combustion chamber 5 to mix with the fuel.

[0039] The heat exchange sleeve 3 is a cylindrical sleeve with a bottom surface. The outer diameter of the cylinder is Φ90mm, the wall thickness is 1.5mm, and the height is 45mm. The bottom diameter is Φ90mm, the inner diameter is Φ12mm, and the wall thickness is 1.5mm. It is made of a high-temperature resistant material with high thermal conductivity. Three layers of parallel air inlets 28 are provided on the cylinder wall, with a 10mm interval between adjacent layers. Each layer has four inlets 28, symmetrically distributed at 90° intervals perpendicular to the axis. The horizontal portion of the heat exchange sleeve 3 forms a horizontal airflow channel with the base 23, and the vertical portion of the heat exchange sleeve 3 forms a vertical airflow channel 2 with the outer sleeve 1. The combination of the horizontal and vertical airflow channels 2 forms the overall airflow channel. The rotating circular plate 13 and the horizontal portion of the heat exchange sleeve 3 form a bottom horizontal flue 12, the hollow portion of the inner sleeve 17 forms a vertical flue 18, and the heat exchange circular plate 25 and the fuel supply box base 21 form a top horizontal flue 27.

[0040] It also includes a high-voltage DC power supply 19. The negative lead of the high-voltage DC power supply 19 passes through the heat exchange circular plate 25 and connects to the metal mesh 7. The positive lead of the high-voltage DC power supply 19 passes through the heat exchange circular plate 25 and the inner sleeve 17 in sequence and connects to the nozzle 15. It also includes an igniter 6. The igniter 6 is located at the center of the metal mesh 7 and is connected to an external power source through a lead 22.

[0041] The innovative features of this embodiment are as follows:

[0042] The inner wall of the atomizing chamber 4 is equipped with a multi-nozzle nozzle 16, the top of which passes through the fuel supply box base 21 and connects to the fuel supply box 20. The multi-nozzle nozzle 16 has a height of 45mm, an outer diameter of Φ6mm, an inner diameter of Φ4mm, and a bottom wall thickness of 1mm. Three parallel nozzle groups 15 are arranged on the nozzle wall, with a 10mm interval between adjacent groups. Each group has four nozzles, with an outer diameter of Φ1.5mm, an inner diameter of Φ1.0mm, and a length of 9mm. All nozzles are at the same height; the nozzles 15 are perpendicular to the axial direction of the multi-nozzle nozzle 16, spaced 90° apart, and arranged in parallel. The multi-nozzle nozzle 16 is arranged in reverse, with the nozzle inlet passing through the fuel supply box base 21 into the fuel supply box 20. Liquid fuel enters the multi-nozzle nozzle 16 by its own gravity and is ejected from each nozzle 15. This eliminates the need for a fuel supply pump, saving on burner costs. After the high-voltage DC power supply 19 is turned on, an electrostatic field is formed between the nozzle 15 and the metal mesh 7. The fuel droplets sprayed through the nozzle 15 become positively charged due to contact with the nozzle 15. Under the action of the electrostatic field, they break up and atomize, and move to the porous medium 9. The droplets absorb heat on the porous medium 9 and evaporate into fuel vapor, which mixes with the air and burns on the metal mesh 7. When the flue gas flows through the bottom horizontal flue 12, it exchanges heat with the air in the horizontal airflow channel, fully preheating the air. The air on the outer side acts as insulation material to reduce the heat loss of the high-temperature flue gas. When the flue gas flows through the vertical flue 18, it exchanges heat with the multi-nozzle nozzle 16 in the vertical flue 18, fully preheating the liquid fuel in the multi-nozzle nozzle 16, increasing its temperature and decreasing its viscosity when sprayed, thus enhancing the atomization effect. When the flue gas flows through the top horizontal flue 27, it exchanges heat with the liquid fuel in the fuel supply box 20, not only preheating the liquid fuel in the fuel supply box 20, but also reducing the exhaust temperature and reducing the heat loss of the burner.

[0043] The combustion chamber 5 contains a rotating circular plate 13 with a porous medium 9 fixed inside. The bottom of the rotating circular plate 13 has an outer diameter of Φ77mm, an inner diameter of Φ8mm, and a height of 1mm; the middle section has an outer diameter of Φ10mm, an inner diameter of Φ8mm, and a height of 4mm; and the top section has an outer diameter of Φ15mm, an inner diameter of Φ8mm, and a height of 1.5mm. It is made of a high-temperature resistant, wear-resistant material with high thermal conductivity. At distances of 30mm and 32mm from the axis, there are two protrusions perpendicular to the surface of the rotating circular plate, each 5mm high and 1mm thick, with a gap between them. The porous medium 9, with an outer diameter of Φ64mm, a thickness of 1mm, and a height of 38mm, is tightly fixed to the rotating circular plate 13 through the gap between the protrusions. An annular boss is also present on the inner side of the rotating circular plate 13. The annular boss is sealed to the inner sleeve 17 with a sealing material to prevent flue gas leakage. The rotating circular plate 13 is welded together with the rotating sleeve 8, forming a rotating assembly with the motor 11. The rotating sleeve 8 has an outer diameter of Φ11mm, an inner diameter of Φ8mm, and a height of 15mm, and is made of high-temperature and wear-resistant insulation material. Symmetrical arcs with a height of 4mm and an opening of 90° are provided on both sides of the bottom as flue gas passages. Sealing material 14 is used between the rotating sleeve 8 and the base 23, and between the rotating circular plate 13 and the inner sleeve 17. The surface of the sealing material 14 is coated with grease to reduce rotational friction resistance. When the motor 11 starts, it drives the porous medium 9 to rotate. The rotating porous medium 9 fully captures the fuel droplets ejected from the nozzle 15 on its entire surface, ensuring uniform distribution of the fuel droplets on the porous medium 9, in conjunction with the high-flow-rate multi-nozzle nozzle 16. The porous medium 9 is divided into a combustion zone and an evaporation zone, with the combustion zone on the outer side. During the rotation of the porous medium 9, under the action of centrifugal force, the fuel liquid in the evaporation zone fully contacts the high-temperature flue gas in the combustion zone, accelerating the evaporation of the liquid fuel. The rotating porous medium 9 also entrains the air in the combustion chamber 5, accelerating the mixing of air and fuel vapor and increasing the reaction rate. There is a gap between the top of the porous medium 9 and the heat exchange circular plate 25; there is also a gap between the upper surface of the rotating circular plate 13 and the metal mesh 7. The bottom of the rotating sleeve 8 also has a flue gas inlet, allowing flue gas to enter the vertical flue 18 through the bottom of the rotating sleeve 8. The rotating sleeve 8 and the base 23 are sealed by a sealing material. The surface of the sealing material is coated with grease to reduce friction between the wall and the sealing material during rotation. The outermost part of the rotating circular plate 13, inserted into the bottom of the combustion chamber 5, acts as a baffle, extending the residence time of the flue gas in the combustion chamber and contributing to stable combustion.

[0044] The combustion chamber 5 is also equipped with a heat exchange circular plate 25 with a fixed metal mesh 7. The heat exchange circular plate 25 has an outer diameter of Φ98mm, an inner diameter of Φ16mm, and a thickness of 1mm, and is made of a high-temperature resistant material with high thermal conductivity. Two protrusions with a height of 5mm and a thickness of 1mm are also provided at distances of 33mm and 35.5mm from the axis, perpendicular to the bottom surface of the heat exchange circular plate, for fixing the metal mesh 7. The atomization chamber 4 and the combustion chamber 5 are separated by the metal mesh 7 and the porous medium 9. The top of the atomization chamber 4 is sealed by the heat exchange circular plate 25, and the bottom of the atomization chamber 4 is sealed by the rotating circular plate 13. The metal mesh 7 and the fixing plate 24 at the top of the metal mesh 7 form a metal mesh plate. The metal mesh 7 is honeycomb-shaped, with an outer diameter of Φ69mm, a thickness of 1mm, and a height of 37mm. The fixing plate 24 is in the shape of a boss, with an outer diameter of Φ70mm, a thickness of 1.5mm, and a height of 1mm. The fixing plate 24 is tightly connected to the metal mesh 7, and the fixing plate 24 is fitted with a specific gap at the bottom of the heat exchange circular plate 25, thereby fixing it below the heat exchange circular plate 25. The metal mesh 7 is made of highly conductive stainless steel with a mesh density of 80 pores / cm2, and its surface is coated with a Pt-Ni catalyst.

[0045] The combustion process in this embodiment includes the following steps:

[0046] 1) When the high-voltage DC power supply is turned on, the fuel liquid in the fuel supply tank 20 enters the nozzles 15 symmetrically distributed in each layer through the multi-nozzle nozzle 16 under the action of gravity, and is sprayed out after being preheated by the vertical flue 18; air enters from the air intake channel 10 on the base 23, flows through the horizontal air flow channel, is preheated by the bottom horizontal flue 12, enters the vertical air flow channel 2, and is then sprayed out from the air intake port 28 of each layer;

[0047] 2) The fuel liquid ejected from nozzle 15 is broken up under the action of electrostatic field and moves to the porous medium 9 where it is captured. Then it evaporates into fuel vapor in the high-temperature porous medium 9 heated after the initial ignition of the fuel droplets.

[0048] 3) Start the motor 11 to drive the rotating sleeve 8 and the rotating disc 13 to rotate. The porous medium 9 on the rotating disc 13 rotates accordingly, entraining the air in the combustion chamber to mix with the fuel vapor, which is then ignited by the igniter 6 and burns stably on the metal grid 7. The exhaust gas produced after combustion flows through the bottom horizontal flue 12, the vertical flue 18 and the top horizontal flue 27 in sequence, and exchanges heat with the air, the fuel liquid in the multi-nozzle nozzle 16 and the fuel liquid in the fuel supply box 20 respectively. Finally, it is discharged from the exhaust port 26, completing the entire combustion process.

[0049] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention and should not be construed as limiting the specific implementation of the invention to these descriptions. For those skilled in the art, any equivalent substitutions or obvious modifications made without departing from the inventive concept, resulting in identical performance or application, should be considered to fall within the patent protection scope defined by the submitted claims.

Claims

1. A small charged spray burner, comprising a combustion chamber with a heat exchange sleeve having multiple air inlets on its outer side, an atomizing chamber located inside the combustion chamber, an outer sleeve with multiple exhaust ports at its top, an inner sleeve, and a base, wherein the top end of the outer sleeve is sealed by a fuel supply box base, the bottom end of the outer sleeve is sealed by the base, and the hollow portion of the inner sleeve forms a vertical flue, characterized in that: The gap between the heat exchange sleeve and the base forms a horizontal airflow channel, the gap between the outer sleeve and the heat exchange sleeve forms a vertical airflow channel, the gap between the horizontal section of the heat exchange sleeve and the rotating circular plate forms a bottom horizontal flue, and the gap between the heat exchange circular plate and the fuel supply box base forms a top horizontal flue. The bottom horizontal flue and the top horizontal flue are located inside the airflow channel. The inner wall of the atomizing chamber is provided with a multi-nozzle nozzle whose top end passes through the fuel supply box base and communicates with the fuel supply box. The multi-nozzle nozzle includes multiple nozzles fixed to the inner wall of the atomizing chamber and is located in the vertical flue formed by the hollow part of the inner sleeve. The combustion chamber is provided with a rotating circular plate with a porous medium fixed in place, and a heat exchange circular plate with a metal mesh fixed in place. The outermost part of the rotating circular plate is inserted into the bottom part of the combustion chamber as a baffle. The vertical part of the heat exchange cylinder is provided with a multi-layer air inlet group. Each layer of the multi-layer air inlet group has four air inlets. The four air inlets are perpendicular to the axis and symmetrically distributed at 90° intervals. It is also equipped with a high-voltage DC power supply, the positive terminal of which is connected to the plurality of nozzles, and the negative terminal of which is connected to the metal mesh; It also includes an igniter, which is located on the outer side of the center of the metal mesh and is connected to an external power source via a lead wire.

2. The small charged spray burner as described in claim 1, characterized in that: The porous medium and the metal mesh separate the combustion chamber from the atomization chamber. The top of the atomization chamber is sealed by a heat exchange circular plate, and the bottom of the atomization chamber is sealed by a rotating circular plate.

3. The small charged spray burner as described in claim 1, characterized in that: The liquid inlet of the multi-nozzle nozzle is located at the top and inside the combustion supply box. The multiple nozzles of the multi-nozzle nozzle are a multi-layer nozzle group. The multiple nozzles of each layer of the multi-layer nozzle group are at the same height and arranged perpendicular to the axial direction of the multi-nozzle nozzle. The multiple nozzles pass through the vertical flue, the inner sleeve and the inner wall of the atomization chamber in sequence.

4. The small charged spray burner as described in claim 1, characterized in that: The rotating circular plate has two protrusions perpendicular to the plane of the plate, and there is a gap between the two protrusions. The porous medium is fixed to the rotating circular plate through the gap between the protrusions. The rotating disc has an annular boss on its inner side, and the annular boss is sealed to the inner sleeve by a sealing material. The rotating disc has a vertical protrusion at the bottom of the combustion chamber.

5. The small charged spray burner as described in claim 1, characterized in that: The heat exchange circular plate is provided with two protrusions perpendicular to the plane of the circular plate, and there is a specific shape interval between the two protrusions; The metal mesh plate consists of a fixing plate with a top protrusion and a metal mesh. The fixing plate and the metal mesh plate are spaced apart and fitted together to fix the metal mesh plate to the heat exchange circular plate.

6. The small charged spray burner as described in claim 1, characterized in that: An electric motor is located at the center of the base, and the electric motor, together with the rotating sleeve and the rotating circular plate, forms a rotating component. The rotating sleeve is sealed to the base with a sealing material. The rotating sleeve is placed in reverse and has a flue gas inlet on its bottom wall.

7. The small charged spray burner as described in claim 1, characterized in that: There is a gap between the porous medium and the heat exchange disc; There is a gap between the metal mesh and the rotating circular plate.

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