Biomass boiler with hot air supply and air supply method thereof

Abstract

The present invention relates to the technical field of air supply for biomass boilers, and more specifically, to a biomass boiler with hot air supply and an air supply method thereof. The boiler comprises a boiler body, a combustion chamber is provided on the boiler body, an air supply assembly is installed on the boiler body, a wind direction equalizing assembly is provided inside the combustion chamber, and the wind direction equalizing assembly includes an induced draft duct connected to the air supply assembly; a guide plate is provided in the combustion chamber and below the induced draft duct, and the guide plate is used to introduce the input biomass fuel into the combustion chamber. The induced draft duct is movably connected to the air supply assembly. When the induced draft duct rotates and drives one end of the induced draft duct close to the guide plate, the induced draft duct pushes the biomass fuel accumulated on the guide plate to one side. The present invention inputs a hot air flow into the combustion chamber through the air supply assembly, so that the temperature of the biomass fuel is increased, and it is burned quickly, thereby increasing the combustion rate of the biomass fuel. While accelerating the combustion rate, the fullness of the fuel combustion is also improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air supply for biomass boilers, in particular to a biomass boiler with hot air supply and an air supply method thereof. Background Art

[0002] Boilers include coal-fired boilers, domestic boilers and biomass boilers. Most industrial boilers are biomass boilers, which use biomass as fuel (biomass fuel refers to: agricultural and forestry waste (such as straw, sawdust, sugarcane bagasse, rice chaff, etc.);

[0003] When the current biomass boiler is working, a large amount of oxygen is required for combustion, that is, cold air blowing is needed to achieve the air intake of the boiler to achieve combustion-supporting of the boiler and make it burn normally. However, the operation of achieving combustion-supporting by feeding cold air still has the following problems:

[0004] The input of cold air will lower the temperature inside the boiler. Although it has the effect of supporting combustion, it also affects the combustion rate of the fuel in the boiler, that is, the combustion speed is still not fast enough;

[0005] Moreover, when the cold air is introduced directly, the airflow directly enters the boiler, but the direction of the airflow is fixed, so that the airflow cannot be evenly diffused in the boiler, which affects the efficiency and fullness of the overall combustion of the biomass fuel.

[0006] In view of this, the practicality of the biomass boiler used in the prior art is poor. Summary of the Invention

[0007] The object of the present invention is to provide a biomass boiler with hot air supply and an air supply method thereof, so as to solve the problems raised in the above background technology.

[0008] To achieve the above-mentioned objectives, one of the objectives of the present invention is to provide a biomass boiler with hot air supply, including a boiler body, a combustion chamber is provided on the boiler body, and an air supply assembly is installed on the boiler body, and the air supply assembly is used to provide preheated air flow to the combustion chamber to assist combustion of biomass fuel, and a plurality of wind direction balancing assemblies are arranged inside the combustion chamber, and the wind direction balancing assembly includes an induced draft duct connected to the air supply assembly, and the induced draft duct is used to uniformly guide and diffuse the hot air flow exported by the air supply assembly to the combustion chamber, and a guide plate is provided in the combustion chamber and below the induced draft duct, and the guide plate is used to introduce the input biomass fuel into the combustion chamber, and the induced draft duct is movably connected to the air supply assembly, and when the induced draft duct rotates and drives one end of the induced draft duct close to the guide plate, the induced draft duct pushes the biomass fuel accumulated on the guide plate to one side.

[0009] As a further improvement of the present technical solution, a feed bin for feeding biomass fuel into the combustion chamber is installed on the boiler body, a cover plate is hinged on the feed bin, and a drain pipe for discharging liquid is installed on one side of the boiler body, and the drain pipe is sealed by a cover shell.

[0010] As a further improvement of the present technical solution, a support plate is installed at the bottom of the boiler body, and the support plate forms a channel between the bottom of the boiler body and the ground for airflow.

[0011] As a further improvement of the present technical solution, the air supply assembly includes a hot air blower installed on the boiler body, the hot air blower is connected to a plurality of air duct pipes, one end of the air duct pipe is connected to the induced draft pipe, and a hot air flow is introduced into the induced draft pipe.

[0012] As a further improvement of the present technical solution, a valve for preventing smoke from entering the air duct is installed on the air duct.

[0013] As a further improvement of the present technical solution, a connecting portion is installed on the side of the air duct, and the connecting portion is rotatably connected to the air duct. A plurality of air duct openings are opened on the side of the air duct, wherein:

[0014] A fixed handle is installed on the side of the wind direction balancing component and close to one end, and one end of the fixed handle extends out of the boiler body.

[0015] As a further improvement of the present technical solution, the two air ducts are connected by a slide, and when the fixed handle rotates, the slide drives the two air ducts to rotate synchronously.

[0016] As a further improvement of the present technical solution, a sealing shell is hingedly provided on the outer side of the boiler body, and the sealing shell seals the fixed handle extending out of the boiler body. The sealing shell is used to prevent the smoke generated during combustion in the combustion chamber from flowing out.

[0017] As a further improvement of the present technical solution, an air duct opening blocking block is provided in the air duct, and the air duct opening blocking block is used to block the air duct opening near the end. The air duct opening blocking block is installed with a slider, and a slideway slidably connected to the slider is provided on the air duct.

[0018] A second object of the present invention is to provide an air supply method for a biomass boiler with hot air supply as described above, comprising the following steps:

[0019] Step 1: Place the biomass fuel into the combustion chamber along the feed bin, and the biomass fuel slides along the guide plate and is dispersed in the combustion chamber;

[0020] Step 2: The hot air is generated by the operation of the hot air blower and output to the induced draft duct. The induced draft duct guides the hot air flow through the air duct opening and is evenly dispersed in the combustion chamber. When the biomass fuel is ignited, the diffused hot air flow will accelerate the combustion rate of the biomass fuel.

[0021] Step 3: When the fixed handle rotates to drive the draft tube to rotate, the movement of the draft tube changes the position of the air duct opening to guide the air flow diffusion, so that the hot air flow accurately contacts the accumulated biomass fuel and causes it to burn quickly. The movement of the draft tube also synchronously wipes away the waste generated on the guide plate, which is conducive to the re-introduction of biomass fuel, and causes it to slide along the guide plate and be dispersed in the combustion chamber for uniform combustion.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. In the biomass boiler with hot air supply and its air supply method, a hot air flow is input into the combustion chamber through the air supply component, and the hot air flow is evenly diffused in the combustion chamber through the guidance of the induced draft duct. Under the preheating of the hot air flow, the temperature of the biomass fuel is increased, the biomass fuel is burned quickly, and the combustion rate of the biomass fuel is improved. While accelerating the combustion rate, the supply of hot air flow also improves the completeness of fuel combustion. Compared with the current method of cold air supply, the hot air flow preheating method of this solution is more excellent.

[0024] 2. In the biomass boiler with hot air supply and its air supply method, as the biomass fuel is fed inward along the guide plate, the biomass fuel is evenly burned in the combustion chamber; the air duct is rotated to change the direction of the hot air flow guided by the air duct, so that the hot air flow accurately supports the combustion of the accumulated and unburned biomass fuel, accelerates the combustion rate, and when one end of the air duct is close to the guide plate, it scrapes the waste remaining from the combustion on the guide plate. When the biomass fuel is subsequently fed along the guide plate, the problem that the biomass fuel is blocked by the waste remaining from the initial combustion and is difficult to move inward is solved, so that the subsequently added biomass fuel can quickly enter the combustion chamber and burn, further improving the practicality of the boiler body. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a cross-sectional view of the overall structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 3 This is a schematic structural diagram of the air supply component and wind direction balancing component of the present invention;

[0028] Figure 4 It is a structural schematic diagram of the guide plate of the present invention;

[0029] Figure 5This is a cross-sectional view of the wind direction balancing component structure of the present invention;

[0030] Figure 6 This is a schematic structural diagram of the air duct blocking block of the present invention;

[0031] Figure 7 This is a schematic diagram of the wind direction balancing component structure of the present invention;

[0032] Figure 8 This is a gas supply flow chart of the biomass boiler of the present invention.

[0033] The meaning of each number in the figure is:

[0034] 1. Boiler body; 1A. Combustion chamber; 11. Feed bin; 12. Drain pipe; 13. Support plate; 14. Sealing shell;

[0035] 2. Air supply assembly; 21. Hot air blower; 22. Air duct; 23. Valve;

[0036] 3. Wind direction equalizing assembly; 31. Air duct; 32. Connecting part; 33. Air duct opening; 34. Fixed handle; 35. Air duct opening blocking block; 351. Slider; 36. Slide; 37. Connecting arm;

[0037] 4. Guide plate; 41. Push plate. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0040] Example 1

[0041] See also Figures 1-4As shown, this embodiment provides a biomass boiler with hot air supply, including a boiler body 1, a combustion chamber 1A is opened on the boiler body 1, and an air supply component 2 is installed on the boiler body 1, the air supply component 2 is used to provide preheated air flow to the combustion chamber 1A to assist combustion of biomass fuel, and a plurality of wind direction balancing components 3 are arranged inside the combustion chamber 1A, the wind direction balancing component 3 includes an induced draft duct 31 connected to the air supply component 2, and the induced draft duct 31 is used to uniformly guide and diffuse the hot air flow exported by the air supply component 2 to the combustion chamber 1A. In this embodiment, before the boiler body 1 is working, biomass fuel is put into the combustion chamber 1A, and the air supply component 2 is working, the air supply component 2 will input hot air flow into the combustion chamber 1A, and the hot air flow will be uniformly diffused in the combustion chamber 1A through the guidance of the induced draft duct 31, and under the preheating of the hot air flow, the biomass fuel is As the temperature rises, when the biomass fuel is ignited, it will burn rapidly, increasing the current combustion rate of the biomass fuel, and through the preheating treatment in the combustion chamber 1A, the combustion rate of the biomass fuel is simultaneously accelerated (biomass fuels include: straw, sawdust, bagasse, rice chaff, etc., these fuels will be quickly preheated due to their own heat absorption properties). While accelerating the combustion rate, the supply of hot air flow also improves the completeness of fuel combustion. Compared with the current method of cold air supply, the hot air flow supply preheating method of this scheme is more excellent (the working principle of the biomass boiler 1 is: first, through the combustion process of the fuel and the heat transfer process in the furnace on the flue gas side outside the heating surface; second, through the heat transfer process between the metal of the heating surface and the service, the heating, evaporation and superheating process of the working fluid, the flow process of the working fluid and the thermochemical process on the working fluid side, thereby operating).

[0042] Next, a guide plate 4 is provided in the combustion chamber 1A and below the induced air duct 31. The guide plate 4 is used to introduce the input biomass fuel into the combustion chamber 1A. The induced air duct 31 is movably connected to the air supply assembly 2. When the induced air duct 31 rotates and drives one end of the induced air duct 31 close to the guide plate 4, the induced air duct 31 pushes the biomass fuel accumulated on the guide plate 4 to one side. As the biomass fuel input into the combustion chamber 1A approaches the inside through the guide plate 4, it is ensured that the biomass fuel enters the combustion chamber 1A, and the guide plate 4 also has biomass fuel for combustion, thus achieving the effect of uniform combustion of the biomass fuel. However, there will be residual biomass fuel on the guide plate 4. When the waste material is burned, if the waste material accumulates too much, it will affect the subsequent addition of biomass fuel into the combustion chamber 1A. The rotation of the induced draft pipe 31 can change the wind direction of the hot air flow guided by the induced draft pipe 31 again, thereby accelerating the combustion of the biomass fuel. When one end of the induced draft pipe 31 is close to the guide plate 4, the waste material remaining from the combustion on the guide plate 4 is scraped to move inward, so that when the biomass fuel is subsequently added along the guide plate 4, the problem that the biomass fuel is blocked by the waste material remaining from the initial combustion and is difficult to move inward is solved, so that the subsequently added biomass fuel can quickly enter the combustion chamber 1A for combustion, further improving the practicality of the boiler body 1.

[0043] Among them, the boiler body 1 is equipped with a feed bin 11 for feeding biomass fuel into the combustion chamber 1A, and a cover is hinged on the feed bin 11. A drain pipe 12 for discharging liquid is installed on one side of the boiler body 1. The drain pipe 12 is sealed by the cover shell. The biomass fuel can be fed along the feed bin 11, and the cover is sealed after the feeding is completed to prevent the flue gas generated by the combustion from flowing out and affecting the environment. When the boiler body 1 is completed, the cover shell can be opened to discharge the heated liquid from the boiler body 1.

[0044] Secondly, a support plate 13 is installed at the bottom of the boiler body 1. The support plate 13 forms a channel for airflow between the bottom of the boiler body 1 and the ground, avoiding direct contact between the bottom of the boiler body 1 and the ground, reducing the temperature and causing heat transfer, thereby reducing the temperature loss in the boiler body 1 and avoiding affecting the nearby environment.

[0045] Specifically, the air supply assembly 2 includes a hot air blower 21 installed on the boiler body 1. Several air duct pipes 22 are connected to the hot air blower 21. One end of the air duct pipe 22 is connected to the induced draft pipe 31, and a hot air flow is introduced into the induced draft pipe 31. The hot air flow is generated by the operation of the hot air blower 21, and is passed through the air duct pipe 22 into the induced draft pipe 31. The hot air flow will diffuse into the combustion chamber 1A along the induced draft pipe 31, thereby achieving the above-mentioned effect of uniformly placing the hot air flow in the combustion chamber 1A (the working principle of the hot air blower 21 is: after power is turned on, the blower blows air into the heater, allowing the air to pass evenly from the inside and outside of the spiral heating wire. The heat generated by the heating wire after power is turned on is heat exchanged with the cold air passing through, thereby increasing the air temperature at the air outlet. The K-type thermocouple at the air outlet will be detected in time).

[0046] Among them, a valve 23 is installed on the air duct pipe 22 for preventing flue gas from entering the air duct pipe 22. When the hot air blower 21 no longer supplies hot air, the valve 23 opens to close the air duct pipe 22, so that the flue gas generated by the combustion in the combustion chamber 1A will not enter the air duct pipe 22 and the hot air blower 21, ensuring that the operation of the entire device is not affected (the model used by the valve 23 is: QJT200-8).

[0047] Secondly, a connecting portion 32 is installed on the side of the induced draft pipe 31, and the connecting portion 32 is rotatably connected to the air duct pipe 22. A number of air duct openings 33 are opened on the side of the induced draft pipe 31, and the hot air flow will diffuse into the combustion chamber 1A through the air duct openings 33 respectively, so that the hot air flow is evenly dispersed. When the biomass fuel is ignited in the combustion chamber 1A, it will burn quickly and more fully, thereby improving the practicality of the boiler body 1; and a fixed handle 34 is installed on the side of the wind direction balancing component 3 and near one end. One end of the fixed handle 34 extends out of the boiler body 1, and the operator The operator can hold the fixed handle 34 tightly. When the fixed handle 34 moves upward on the boiler body 1, the induced draft pipe 31 will rotate under the connection of the connecting portion 32, so that the movement of the induced draft pipe 31 changes the wind direction of the hot air flow. When the hot air flow is closer to the fuel accumulated in the combustion chamber 1A, it provides auxiliary combustion effect for the accumulated and unburned biomass fuel, accelerates the fuel efficiency of the biomass fuel in the combustion chamber 1A, and the induced draft pipe 31 rotates synchronously to scrape off the waste remaining on the guide plate 4, which is conducive to the uniformity of the biomass fuel being put into the combustion chamber 1A for combustion.

[0048] Furthermore, a sealed housing 14 is hingedly mounted on the exterior of the boiler body 1. This seals the fixed handle 34 extending from the boiler body 1 and prevents the outflow of flue gas generated during combustion in the combustion chamber 1A. A movable groove is provided in the boiler body 1, which moves with the fixed handle 34. This allows flue gas to flow out of the combustion chamber 1A along the groove during combustion. To prevent this, the sealed housing 14 seals the fixed handle 34 and the groove, preventing the outflow of flue gas. Opening the sealed housing 14 allows the fixed handle 34 to move, and upon completion, the sealed housing 14 can be reset.

[0049] A push plate 41 is installed on the side of the guide plate 4, and the push plate 41 extends out of the boiler body 1. When the push plate 41 is pushed inward, the guide plate 4 will scrape the inner wall of the combustion chamber 1A and scrape the burning waste to prevent the whole from being piled together. When it is subjected to the movement force of the guide plate 4, the inside will be dispersed, causing collapse, which is conducive to the subsequent uniform replenishment of biomass fuel.

[0050] Example 2

[0051] See also Figure 7 As shown, the two induced draft pipes 31 are connected by a slide 36, and when the fixed handle 34 is rotated, the slide 36 drives the two induced draft pipes 31 to rotate synchronously. This eliminates the need for each induced draft pipe 31 to be equipped with a fixed handle 34 extending from the boiler body 1. By connecting the two opposing induced draft pipes 31 via a connecting arm 37, the two induced draft pipes 31 can be rotated by simply rotating one fixed handle 34, thereby simplifying the design of the present structure and saving costs.

[0052] However, when a large amount of unburned biomass fuel accumulates on one side of the combustion chamber 1A, the two draft ducts 31 are rotated by moving the fixed handle 34, and the wind directions of the two draft ducts 31 are changed at the same time. However, in actual conditions, only one draft duct 31 needs to be changed to be close to the side of the biomass fuel. The fixed handle 34 cannot change the wind direction of a single draft duct 31. Therefore, the connecting arm 37 can be selected according to the specific actual conditions.

[0053] Example 3

[0054] See also Figure 5 and Figure 6As shown, considering that there are many air duct openings 33 opened on the air duct 31, when the air duct 31 rotates to contact the waste on the guide plate 4, the waste enters the air duct opening 33 near the guide plate 4 at the end of the air duct 31, affecting the discharge of hot air flow, an air duct opening blocking block 35 is provided in the air duct 31, and the air duct opening blocking block 35 is used to block the air duct opening 33 near the end (blocking means that the air duct opening blocking block 35 blocks the air duct opening 33 from discharging hot gas), and a slider 351 is installed on the air duct 31, and a slide 36 is provided on the air duct 31 to be slidably connected to the slider 351. The air duct opening blocking block 35 is initially set at a middle position near the air duct 31 and does not affect the connection part 32 and The air duct opening 33 discharges the hot air flow. As the air duct 31 rotates and one end thereof faces downward, the air duct opening blocking block 35 slides to one end of the air duct 31 due to gravity, blocking the air duct opening 33 near the end of the air duct 31, thereby preventing waste from entering the connecting portion 32 and allowing the air duct 31 to be used normally. Moreover, the sliding connection between the slider 351 and the slide 36 not only makes the sliding of the air duct opening blocking block 35 more stable, but because one end of the slide 36 is close to the position where the connecting portion 32 and the air duct 31 are connected, but one end of the slide 36 does not exceed the installation position of the connecting portion 32, the position of the air duct opening blocking block 35 to be reset is limited, so that it will not block the connecting portion 32 from extracting the hot air flow into the air duct 31.

[0055] See also Figure 8 As shown, the second object of the present invention is to provide an air supply method for a biomass boiler using hot air supply according to the above method, comprising the following steps:

[0056] Step 1: Place the biomass fuel into the combustion chamber 1A along the feed bin 11, and the biomass fuel slides along the guide plate 4 and is dispersed in the combustion chamber 1A;

[0057] Step 2: The hot air blower 21 is operated to generate a hot air flow, which is output to the induced draft duct 31. The induced draft duct 31 guides the hot air flow through the air duct opening 33 and evenly disperses it in the combustion chamber 1A. When the biomass fuel is ignited, the diffused hot air flow accelerates the combustion rate of the biomass fuel.

[0058] Step 3: When the fixed handle 34 rotates to drive the air duct 31 to rotate, the movement of the air duct 31 changes the position of the air duct opening 33 to guide the air flow diffusion, so that the hot air flow accurately contacts the accumulated biomass fuel and causes it to burn quickly. In addition, the movement of the air duct 31 synchronously wipes off the waste generated on the guide plate 4, which is conducive to the re-introduction of biomass fuel, and causes it to slide along the guide plate 4 and be dispersed in the combustion chamber 1A for uniform combustion.

[0059] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A biomass boiler for hot air supply, comprising a boiler body (1), wherein a combustion chamber (1A) is provided on the boiler body (1), and characterized in that: An air supply assembly (2) is installed on the boiler body (1), and the air supply assembly (2) is used to provide preheated air flow to the combustion chamber (1A) so as to assist combustion of biomass fuel. A plurality of wind direction balancing assemblies (3) are provided inside the combustion chamber (1A), and the wind direction balancing assembly (3) includes an air duct (31) connected to the air supply assembly (2). The air duct (31) is used to uniformly guide and diffuse the hot air flow guided out of the air supply assembly (2) to the combustion chamber (1A). A guide plate (4) is provided in the combustion chamber (1A) and below the air duct (31). The guide plate (4) is used to guide the biomass fuel fed into the combustion chamber (1A). The air duct (31) is movably connected to the air supply assembly (2). When the air duct (31) rotates and drives one end of the air duct (31) close to the guide plate (4), When the guide plate (4) is in the air duct (31), the air duct (31) pushes the biomass fuel accumulated on the guide plate (4) to one side. A connecting portion (32) is installed on the side of the air duct (31). The connecting portion (32) is rotatably connected to the air duct pipe (22). A plurality of air duct openings (33) are opened on the side of the air duct (31), wherein: a fixed handle (34) is installed on the side of the wind direction balancing component (3) and near one end, and one end of the fixed handle (34) extends out of the boiler body (1); an air duct opening blocking block (35) is provided in the air duct (31), and the air duct opening blocking block (35) is used to block the air duct opening (33) near the end. A slider (351) is installed on the air duct opening blocking block (35), and a slideway (36) slidably connected to the slider (351) is opened on the air duct (31).

2. The biomass boiler with hot air supply according to claim 1, characterized in that: The boiler body (1) is provided with a feed bin (11) for feeding biomass fuel into the combustion chamber (1A), a cover plate being hingedly connected to the feed bin (11), and a drain pipe (12) for draining liquid is provided on one side of the boiler body (1), the drain pipe (12) being sealed by a cover shell.

3. The biomass boiler with hot air supply according to claim 2, characterized in that: A support plate (13) is installed at the bottom of the boiler body (1), and the support plate (13) forms a passage between the bottom of the boiler body (1) and the ground for airflow.

4. The biomass boiler with hot air supply according to claim 3, characterized in that: The air supply assembly (2) includes a hot air blower (21) mounted on the boiler body (1), and a plurality of air duct pipes (22) are connected to the hot air blower (21). One end of the air duct pipe (22) is connected to the induced draft pipe (31), and a hot air flow is introduced into the induced draft pipe (31).

5. The biomass boiler with hot air supply according to claim 4, characterized in that: The air duct pipe (22) is provided with a valve (23) for preventing smoke from entering the air duct pipe (22).

6. The biomass boiler with hot air supply according to claim 5, characterized in that: The two air ducts (31) are connected via a slideway (36), and when the fixed handle (34) rotates, the slideway (36) drives the two air ducts (31) to rotate synchronously.

7. The biomass boiler with hot air supply according to claim 6, characterized in that: A sealing shell (14) is hingedly provided on the outer side of the boiler body (1), and the sealing shell (14) seals the fixed handle (34) extending out of the boiler body (1). The sealing shell (14) is used to prevent smoke generated during combustion in the combustion chamber (1A) from flowing outward.

8. An air supply method for a biomass boiler with hot air supply according to claim 7, characterized in that: The method comprises the following steps: Step 1: placing the biomass fuel into the combustion chamber (1A) along the feed bin (11), and the biomass fuel slides along the guide plate (4) and is dispersed in the combustion chamber (1A); Step 2: The hot air flow is generated by operating the hot air blower (21) and outputted to the induced draft pipe (31). The induced draft pipe (31) guides the hot air flow through the air duct opening (33) and is evenly dispersed in the combustion chamber (1A). When the biomass fuel is ignited, the diffused hot air flow accelerates the combustion rate of the biomass fuel. Step 3: When the fixed handle (34) rotates to drive the induced draft pipe (31) to rotate, the movement of the induced draft pipe (31) changes the position of the air duct opening (33) to guide the air flow diffusion, so that the hot air flow accurately contacts the accumulated biomass fuel and causes it to burn quickly. In addition, the movement of the induced draft pipe (31) synchronously wipes away the waste generated on the guide plate (4), which is conducive to the re-introduction of the biomass fuel and causes it to slide along the guide plate (4) and be dispersed in the combustion chamber (1A) for uniform combustion.

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