Biomass pellet combustion machine

Abstract

This invention discloses a biomass pellet burner, comprising: a hopper including an inlet and an outlet; a screw feeder including a screw feed pipe, a screw feed rotating component disposed within the screw feed pipe, and a screw feed drive component connected to the screw feed rotating component, the outlet being disposed at a first end of the screw feed pipe; a combustion chamber disposed at a second end of the screw feed pipe; an air supply device including an air supply chamber and an air supply drive component connected to the air supply chamber, the air supply chamber including an air distribution chamber and a combustion chamber air chamber, the air distribution chamber communicating with the screw feed pipe, and the combustion chamber air chamber communicating with the combustion chamber; and an ignition device, a sealing plate disposed between the air distribution chamber and the combustion chamber, the inlet end of the ignition device being located within the air distribution chamber, and the outlet end of the ignition device being located within the combustion chamber. This invention avoids backflow and backfire by balancing the pressure of the screw feed pipe and the combustion chamber.

Description

Technical Field

[0001] This invention relates to the field of biomass combustion technology, and in particular to a biomass pellet combustion machine. Background Technology

[0002] In the fields of tobacco curing and crop drying, biomass burners are commonly used to provide heat. During operation, the burner's furnace chamber is inserted into a heat exchanger. The high-temperature flue gas generated by combustion is heated by the heat exchanger to circulate hot air for curing. The cooled flue gas after heat exchange is discharged through the heat exchanger outlet. However, it is unavoidable that dust carried in the flue gas will accumulate inside the heat exchanger, clogging the airflow channels, increasing exhaust resistance, and raising the pressure of the high-temperature flue gas at the combustion chamber. Some of the high-temperature flue gas will then enter the burner's screw feeder and be discharged through the hopper, causing backflow and backfire in the hopper, potentially burning out the burner or even causing a fire.

[0003] Chinese invention patent CN115930250A discloses a backfire prevention device for a biomass pellet burner. The backfire prevention device is installed between the feed pipe and the hopper. Through gear transmission, a fan inside the device rotates simultaneously with the feed from the burner, completing the feeding process. When the feed auger stops feeding, the fan seals the feed inlet, preventing smoke and fire from flowing back into the hopper. This device uses the rotation of the blades to complete the hopper feeding and channel sealing, preventing flue gas from entering the feed pipe from the combustion chamber and causing backfire. However, this device increases the number of moving parts in the burner, resulting in a complex structure and high cost. Biomass pellets are generally cylindrical and elongated with a certain degree of hardness, making them prone to getting stuck between the blades and the wall surface during blade rotation, causing the blades to jam, the burner to stop, heating to be interrupted, and resulting in baking quality problems.

[0004] Existing biomass burner ignition devices typically use a ceramic heating rod to heat the air. The heating rod heats the air to 250-300°C before blowing it into the burner's combustion chamber to ignite the biomass pellets. Ignition requires 3-5 minutes, after which the power to the heating rod is turned off. This design results in low hot air temperatures, long ignition times, and even failure to ignite. Excessive ignition time causes a large amount of combustible smoke from the biomass pellets to accumulate in the heat exchanger. When this smoke is ignited, it can cause a deflagration, endangering the equipment and public safety.

[0005] Existing biomass combustion uses a long, narrow container with an internal recessed cavity as the combustion chamber. Biomass pellets are conveyed into this cavity, ignited, and continuously burned. Utility model patent CN216591682U discloses a biomass pellet burner that employs a V-shaped combustion chamber located at the output end of the feeding screw, carrying the burning material. This V-shaped combustion chamber better concentrates biomass fuel and ash produced after combustion than a flat combustion chamber, improving fuel utilization. However, the overall temperature of the biomass fuel layer in this V-shaped combustion chamber is still not high enough, resulting in incomplete combustion of the biomass pellets and fuel waste. When new material is conveyed into the combustion chamber by the screw conveyor, igniting the new fuel requires a certain amount of time, during which a large amount of smoke is generated, wasting fuel and polluting the environment.

[0006] Existing biomass burners typically incorporate a longitudinal coke pusher inside the combustion chamber to expel the coke and ash produced after biomass pellet combustion, allowing the chamber to accommodate new fuel. A common coke pusher is a cylindrical rod with a diameter of approximately 25-40 mm and a flat front end. During operation, this pusher encounters significant resistance, which is even greater for biomass fuels prone to coking, potentially damaging the pusher motor and exhibiting poor adaptability to biomass pellet fuels. Furthermore, this type of pusher does not agitate the biomass fuel layer, pushing out some incompletely burned biomass pellets and wasting fuel.

[0007] Therefore, existing biomass burners have the following problems:

[0008] (1) Existing biomass combustion machines will produce back smoke and backfire, which will burn the burner or even cause a fire; existing backfire prevention devices are complex in structure and costly, increasing the risk of feed jamming in the burner.

[0009] (2) The problem of long automatic ignition time of the burner and failure to ignite. The long ignition time will cause a large amount of combustible smoke generated during the ignition period to accumulate in the heat exchanger. When this combustible smoke is ignited, it will cause deflagration, which will endanger the equipment and the safety of the public.

[0010] (3) When the existing burner is running at a low biomass pellet supply, the furnace temperature is low and the combustion is unstable, which may cause flameout and difficulty in re-igniting of biomass pellets.

[0011] (4) The temperature of the material layer in the combustion chamber of the existing biomass burner is low, the biomass pellets are not completely burned, and the fuel utilization rate is low.

[0012] (5) The existing biomass burner coke pushing device has high operating resistance and the electric push rod is easily damaged. Summary of the Invention

[0013] The main objective of this invention is to provide a biomass pellet burner that avoids backfire by balancing the pressure in the spiral feed pipe and the combustion chamber.

[0014] To achieve the above objectives, the present invention provides a biomass pellet burner, comprising:

[0015] The hopper includes an inlet and an outlet;

[0016] A spiral feeding device includes a spiral feeding tube, a spiral feeding rotating component disposed inside the spiral feeding tube, and a spiral feeding drive component connected to the spiral feeding rotating component. The discharge port is disposed at the first end of the spiral feeding tube.

[0017] A combustion chamber is provided at the second end of the spiral feeding tube;

[0018] An air supply device, comprising an air supply chamber and an air supply drive component connected to the air supply chamber, wherein the air supply chamber comprises an air distribution chamber and a combustion chamber air chamber, the air distribution chamber being connected to the spiral feed pipe, and the combustion chamber air chamber being connected to the combustion chamber;

[0019] An ignition device is provided, which is disposed on a sealing plate between the air distribution chamber and the combustion chamber. The inlet end of the ignition device is located in the air distribution chamber, and the outlet end of the ignition device is located in the combustion chamber.

[0020] Optionally, the spiral feeding rotating component is configured to include a spiral shaft and spiral feeding blades disposed on the spiral shaft, and the spiral feeding driving component is configured as a spiral feeding drive motor; wherein:

[0021] The biomass pellet burner is also equipped with a mounting plate;

[0022] The spiral feeding drive motor is fixed to the first side of the mounting plate;

[0023] The spiral shaft of the spiral feeding rotating component is fixed to the second side of the mounting plate by bearings.

[0024] Optionally, the spiral feeding tube is provided with a number of pressure balance holes that penetrate the inside and outside of the spiral feeding tube.

[0025] Optionally, the sealing plate includes a first sealing section and a second sealing section; wherein:

[0026] The air distribution chamber is configured to connect the first sealing section and the second sealing section on a first surface;

[0027] The combustion chamber air chamber is configured to connect to the second side of the first sealing section, and the combustion chamber is configured to connect to the second side of the second sealing section.

[0028] Optionally, the combustion chamber has an inner wall, and the inner wall is provided with ventilation holes that connect the combustion chamber and the combustion chamber air chamber.

[0029] Optionally, the air supply drive is configured as an air supply blower, the air distribution chamber is configured as a sealed space consisting of a sealing plate and a housing, the air supply blower is disposed at the first end of the sealed space, and the combustion chamber air chamber is connected to and disposed at the second end of the sealed space.

[0030] Optionally, the pressure balance hole is configured to connect the air distribution chamber and the spiral feed pipe, the ventilation hole connects the combustion chamber and the combustion chamber air chamber, and the air distribution chamber connects to the combustion chamber air chamber, so that the spiral feed pipe and the combustion chamber always maintain the same pressure.

[0031] Optionally, the biomass pellet burner further includes:

[0032] A coking device, comprising an electric push rod and a coking rod fixed to the mounting plate;

[0033] The first end of the focus pusher is connected to the electric pusher.

[0034] The second end of the coke pusher rod passes through the air distribution chamber and is arranged through the sealing plate via a guide tube on the sealing plate.

[0035] Optionally, the ignition device includes a Laval nozzle, a cold air inlet disposed at a first end of the Laval nozzle, a hot air outlet disposed at a second end of the Laval nozzle, a smoke backflow port disposed on the side of the Laval nozzle near the hot air outlet, and an electric heating rod disposed inside the Laval nozzle.

[0036] Optionally, the cross-section of the combustion chamber is configured in a parabolic shape, the expression for which is: ;

[0037] The range of the equation coefficient 'a' is 50-500.

[0038] The beneficial effects of this invention are as follows:

[0039] The pressure-balanced structure balances the pressure in the spiral feed pipe and the combustion chamber, ensuring that the pressure of the hot flue gas in the combustion chamber is close to or equal to the air pressure at the pressure balance hole in the feed pipe. Even if the pressure in the combustion chamber increases (when the exhaust pipe is blocked), the air pressure at the pressure balance hole in the feed pipe also increases, thus preventing the high-temperature hot flue gas in the combustion chamber from entering the spiral feed pipe and fundamentally avoiding backfire. This backfire prevention structure is simple and reliable, with no moving parts.

[0040] The combustion chamber adopts a parabolic configuration. Based on the characteristic that the parabolic surface has a focal point, the heat radiation of the flame generated by combustion is focused onto the bottom biomass feed layer through the two side walls of the combustion chamber, which increases the temperature of the feed layer and makes the biomass fuel burn more stably and completely. The newly added biomass pellets will also be quickly ignited by the focused heat radiation, reducing smoke generation and emissions.

[0041] One end of the pusher is tapered or round. This shape allows the pusher to be inserted more easily into the biomass layer to turn the material over, reducing pushing resistance and turning the unburned material at the bottom to the surface for more complete combustion.

[0042] A high-temperature air ignition device with electric heating is provided. It employs a long, electrically heated Laval nozzle with a cold air inlet at one end and a hot air outlet at the other. Several through-holes are arranged circumferentially on the wall surface after the minimum cross-section of the Laval nozzle. During operation, cold air enters through the inlet and is heated to 200-350°C. The air exits through the outlet and onto the biomass fuel in the combustion chamber, generating combustible smoke. This dispersed smoke is drawn back into the nozzle through the through-holes and ignited by the hot air, resulting in a flame temperature of 500-800°C, thus rapidly igniting the biomass pellets and shortening the ignition time. This ignition device does not require an additional fuel supply; it achieves high-temperature ignition by drawing back the combustible smoke generated by the biomass pellets. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the biomass pellet burner of the present invention;

[0044] Figure 2 This is a schematic diagram illustrating the principle of the present invention for preventing backdraft and flashback.

[0045] Figure 3 This is a schematic diagram of the heating device of the present invention;

[0046] Figure 4 This is one embodiment of the heating device of the present invention;

[0047] Figure 5 This is a second embodiment of the heating device of the present invention;

[0048] Figure 6 These are three embodiments of the heating device of the present invention;

[0049] Figure 7 These are four embodiments of the heating device of the present invention;

[0050] Figure 8 This is a schematic diagram of the combustion chamber structure of the present invention;

[0051] Figure 9 This is one embodiment of the combustion chamber structure of the present invention;

[0052] Figure 10 This is a second embodiment of the combustion chamber structure of the present invention;

[0053] Figure 11 These are three embodiments of the combustion chamber structure of the present invention;

[0054] Figure 12 This is a schematic diagram of the structure of the push rod of the present invention.

[0055] Explanation of reference numerals in the attached figures:

[0056] 1-Hopper; 11-Hopper bolt; 12-Flange; 2-Screw feeder; 21-Screw feeder drive motor; 22-Bearing; 23-Screw shaft; 24-Screw feeder pipe; 241-Pressure balance hole; 25-Biomass pellet fuel outlet; 3-Combustion chamber; 31-Mounting flange; 32-Inner wall of combustion chamber; 33-Circular ventilation hole; 4-Ignition device; 41-Laval nozzle; 42-Electric heating rod; 43-Smoke back suction port; 5-Coke pushing device; 51-Electric push rod; 52-Mounting plate; 53-Coke pushing bolt; 54-Coke pushing rod; 541-Mounting hole; 542-Conical head; 55-Sealing gasket; 6-Air supply device; 61-Air supply blower; 62-Air distribution chamber; 63-Sealing plate; 64-Combustion chamber air chamber.

[0057] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0059] This invention provides a biomass pellet burner, referring to... Figure 1-12 .

[0060] In this embodiment, a biomass pellet burner includes: a hopper 1, the hopper 1 including an inlet and an outlet; a screw feeder 2, the screw feeder 2 including a screw feed pipe 24, a screw feed rotating component disposed within the screw feed pipe 24, and a screw feed drive component connected to the screw feed rotating component, the outlet being disposed at a first end of the screw feed pipe 24; a combustion chamber 3, the combustion chamber 3 being disposed at a second end of the screw feed pipe 24; and an air supply device 6, the air supply device 6 including... The system includes an air supply chamber and an air supply drive unit connected to the air supply chamber. The air supply chamber includes an air distribution chamber 62 and a combustion chamber air chamber 65. The air distribution chamber 62 is connected to the spiral feed pipe 24, and the combustion chamber air chamber 65 is connected to the combustion chamber 3. The system also includes an ignition device 4, which is disposed on a sealing plate 64 between the air distribution chamber 62 and the combustion chamber 3. The inlet end of the ignition device 4 is located in the air distribution chamber 62, and the outlet end of the ignition device 4 is located in the combustion chamber 3. The combustion chamber 3 is disposed in a heat exchange chamber 7.

[0061] Existing biomass burners suffer from problems such as backfire, complex backfire prevention devices, incomplete fuel combustion, long ignition times, smoke accumulation and deflagration, and difficulty in adapting the coke pusher motor to different types of biomass pellet fuels, leading to easy damage. To address these issues, this embodiment provides a biomass pellet burner with a simple and reliable structure, backfire prevention, complete fuel combustion, rapid ignition, and good adaptability to various biomass fuel types.

[0062] In a preferred embodiment, the spiral feeding rotating component is configured to include a spiral shaft 23 and spiral feeding blades disposed on the spiral shaft 23, and the spiral feeding driving component is configured as a spiral feeding drive motor 21; wherein, the biomass pellet burner is further provided with a mounting plate 52; wherein, the spiral feeding drive motor 21 is fixed to a first surface of the mounting plate 52; wherein, the spiral shaft 23 of the spiral feeding rotating component is fixed to a second surface of the mounting plate 52 by bearings 22. The spiral feeding pipe 24 is provided with a plurality of pressure balancing holes 241 penetrating the inside and outside of the spiral feeding pipe.

[0063] In a preferred embodiment, the sealing plate 64 includes a first sealing section and a second sealing section; wherein: the air distribution chamber 62 is configured to connect the first sealing section and the second sealing section on a first surface; the combustion chamber air chamber 65 is configured to connect the first sealing section on a second surface; and the combustion chamber 3 is configured to connect the second sealing section on a second surface.

[0064] In a preferred embodiment, the combustion chamber 3 has an inner wall 32, and the inner wall 32 is provided with a circular ventilation hole 33 that connects the combustion chamber 3 and the combustion chamber air chamber 65.

[0065] Specifically, this embodiment provides a biomass pellet burner, including a hopper 1 located at the top and a screw feeding device 2 fixed to its bottom by a flange 12 and hopper bolts 11. A motor 21 is installed at one end of the screw feeding device 2, and the motor 21 is fixed to a mounting plate 52 by bolts. A screw shaft 23 is fixed to the mounting plate 52 by bearings 22. A screw feeding pipe 24 is installed on the outer side of the screw shaft 23, and the rear end of the screw feeding pipe 24 is a biomass pellet fuel outlet 25. Several through-holes 241 arranged longitudinally are provided at the upper part of the pipe. A sealing plate 64 is installed at the rear end of the screw feeding device 2, and a combustion chamber 65 is located on the lower outer side of the sealing plate 64. A parabolic combustion chamber 3 is installed on the combustion chamber 65 by a mounting flange 31. Several through-holes 33 are provided on the inner wall 32 of the combustion chamber to provide oxygen to the biomass pellet fuel. The parabolic combustion chamber 3 is made of high-temperature resistant cast iron or stainless steel.

[0066] Preferably, the air pressure balance hole 241 of the spiral feeding pipe 24 is located at a distance of 0.5 to 10 times the inner diameter of the feeding pipe from the material outlet of the spiral feeding device 24.

[0067] Preferably, the air pressure balance hole 241 of the spiral feeding pipe 24 is arranged in the upper part of the spiral feeding pipe 24 to avoid the biomass fuel debris from clogging the air pressure balance hole.

[0068] Preferably, the air pressure balance hole 241 of the spiral feed tube 24 is elongated.

[0069] In a preferred embodiment, the air supply drive is configured as an air supply blower 61, the air distribution chamber 62 is configured as a sealed space consisting of a sealing plate 64 and a housing 63, the air supply blower 61 is disposed at the first end of the sealed space, and the combustion chamber air chamber 65 is connected to and disposed at the second end of the sealed space.

[0070] In a preferred embodiment, the pressure balance hole 241 is configured to connect the air distribution chamber 62 and the spiral feed pipe 24, the ventilation hole connects the combustion chamber 3 and the combustion chamber air chamber 65, and the air distribution chamber 62 is connected to the combustion chamber air chamber 65, so that the spiral feed pipe 24 and the combustion chamber 3 always maintain the same pressure.

[0071] In a preferred embodiment, the biomass pellet burner further includes a coke pushing device 5, which includes an electric push rod 51 and a coke pushing rod 54 fixed to the mounting plate 52; wherein, the first end of the coke pushing rod 54 is connected to the electric push rod 51; wherein, the second end of the coke pushing rod 54 passes through the air distribution chamber 62 and is disposed through the sealing plate 64 via a guide tube 56 on the sealing plate 64.

[0072] Specifically, the lower part of the spiral feeding device 2 is equipped with a coke pushing device 5 and an air supply device 6. The sealing plate 64 and the outer shell 63 of the air supply device 6 form a sealed air distribution chamber 62. An air supply blower 61 is installed on one side of the air distribution chamber 62. The pressure balance hole 241 on the spiral feeding pipe 24 is connected to the combustion chamber air chamber 65 and the circular ventilation hole 33 through the air distribution chamber 62, so that the hot flue gas pressure p2 at the parabolic combustion chamber 3 and the air pressure p1 at the pressure balance hole 241 in the spiral feeding pipe 24 are similar or equal. Even if the pressure p2 at the combustion chamber 3 increases (when the exhaust pipe is blocked), the air pressure p1 at the pressure balance hole 241 in the spiral feeding pipe 24 also increases accordingly, thereby ensuring that the high-temperature hot flue gas in the combustion chamber 3 cannot enter the spiral feeding pipe 24, fundamentally avoiding the occurrence of backfire.

[0073] The electric push rod 51 of the coke pushing device 5 is fixed on the mounting plate 52. The coke pushing rod 54 is fixed to the electric push rod 51 through the mounting hole 541 at one end with a coke pushing bolt 53. One end of the coke pushing rod 54 is a conical head 542, configured as conical or circular. The coke pushing rod 54 passes through the air distribution chamber 62 through the sealing gasket 55 and exits from the sealing plate 64. A guide tube 56 is provided on the sealing plate to guide the coke pushing rod 54. This shape of push rod can be inserted into the biomass layer more easily to turn the material, reduce the pushing resistance, and turn the unburned material at the bottom to the surface for combustion, resulting in more complete combustion.

[0074] In a preferred embodiment, the ignition device 4 includes a Laval nozzle 41, a cold air inlet disposed at a first end of the Laval nozzle 41, a hot air outlet disposed at a second end of the Laval nozzle 41, a smoke back-suction port 43 disposed on the side of the Laval nozzle 41 near the hot air outlet, and an electric heating rod 43 disposed inside the Laval nozzle 41.

[0075] Specifically, the ignition device 4 is arranged inside the air distribution chamber 62. The inlet of the ignition device 4 is connected to the air distribution chamber 62, and the outlet of the ignition device 4 passes through the sealing plate 64 and is connected to the combustion chamber 3. The Laval nozzle 41 of the ignition device 4 is made of silicon carbide and has an electric heating rod 42 made of silicon carbide inside to heat the cold air entering from the inlet of the Laval nozzle 41. Several through smoke back suction ports 43 are arranged circumferentially on the wall surface after the minimum cross-section of the Laval nozzle 41. During operation, the cold air entering from the inlet is heated to 200~350℃ by electric heating and sprayed out from the outlet onto the biomass fuel in the combustion chamber 3 to generate combustible smoke. This dispersed smoke is sucked back into the nozzle by the smoke back suction ports 43 on the wall surface of the Laval nozzle 41 and ignited by the hot air. The temperature of the ejected flame rises to 500-800℃, thereby quickly igniting the biomass pellets and shortening the ignition time.

[0076] Preferably, the Laval nozzle 41 of the ignition device 4 is made of silicon carbide.

[0077] Preferably, the ignition device 4 is provided with an arc-shaped protective cover with several small holes outside the Laval nozzle 41 to prevent biomass particles from clogging the back suction port.

[0078] Preferably, the ignition device 4 has a plurality of heating wires on the outside of the wall of the Laval nozzle 41 to replace the electric heating rod 42 inside the Laval nozzle 41.

[0079] In a preferred embodiment, the cross-section of the combustion chamber 3 is configured in a parabolic shape, and the expression for the parabolic shape is: The coefficient 'a' in the equation ranges from 50 to 500.

[0080] Specifically, the parabolic combustion chamber 3 within this coefficient range can better concentrate biomass pellet fuel at the bottom of the parabolic combustion chamber 3. Based on the characteristic of the parabolic surface having a focal point, the heat radiation of the flame generated by combustion is focused onto the bottom biomass layer through the two side walls of the parabolic combustion chamber 3, increasing the temperature of the layer and making the biomass fuel burn more stably and completely. Newly added biomass pellets will also be quickly ignited by the focused heat radiation, reducing smoke generation and emissions.

[0081] Preferably, the parabolic combustion chamber 3 is made of high-temperature resistant cast iron or stainless steel.

[0082] Preferably, when the parabolic combustion chamber 3 is made of high-temperature resistant cast iron, it can be integrally cast into a double-layered hollow combustion chamber. The upper layer is the outer wall of the furnace chamber with a parabolic configuration, and the lower layer is the inner wall of the furnace chamber with a parabolic configuration or an arc shape. The hollow part is a wind chamber that is connected to the ventilation hole on the upper layer of the combustion chamber. An air inlet is opened on one longitudinal side of the hollow part to connect to the air supply equipment.

[0083] Preferably, mounting flanges 31 are provided on both lateral sides of the parabolic combustion chamber 3.

[0084] Preferably, the upper part of the horizontal front end of the parabolic combustion chamber 3 is provided with an inverted arc-shaped cover plate, so that the cross-section of the front combustion chamber is roughly circular, thereby increasing the temperature inside the combustion chamber and improving combustion stability.

[0085] It is understood that in the description of this specification, references to terms such as "one embodiment," "another embodiment," "other embodiments," or "first embodiment to Nth embodiment," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0086] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0087] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0088] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A biomass pellet burner, characterized by, include: The hopper includes an inlet and an outlet; A spiral feeding device includes a spiral feeding tube, a spiral feeding rotating component disposed inside the spiral feeding tube, and a spiral feeding drive component connected to the spiral feeding rotating component. The discharge port is disposed at the first end of the spiral feeding tube. A combustion chamber is provided at the second end of the spiral feeding tube; An air supply device, comprising an air supply chamber and an air supply drive component connected to the air supply chamber, wherein the air supply chamber comprises an air distribution chamber and a combustion chamber air chamber, the air distribution chamber being connected to the spiral feed pipe, and the combustion chamber air chamber being connected to the combustion chamber; An ignition device is provided, wherein the ignition device is disposed on a sealing plate between the air distribution chamber and the combustion chamber, the inlet end of the ignition device is located in the air distribution chamber, and the outlet end of the ignition device is located in the combustion chamber; wherein the ignition device includes a Laval nozzle, a cold air inlet disposed at a first end of the Laval nozzle, a hot air outlet disposed at a second end of the Laval nozzle, a smoke back-suction port disposed near the hot air outlet side of the Laval nozzle, and an electric heating rod disposed inside the Laval nozzle.

2. The biomass pellet combustion machine according to claim 1, wherein The spiral feeding rotating component is configured to include a spiral shaft and spiral feeding blades disposed on the spiral shaft, and the spiral feeding driving component is configured to be a spiral feeding drive motor; wherein: The biomass pellet burner is also equipped with a mounting plate; The spiral feeding drive motor is fixed to the first side of the mounting plate; The spiral shaft of the spiral feeding rotating component is fixed to the second side of the mounting plate by bearings.

3. The biomass pellet combustion machine according to claim 1, wherein The spiral feeding tube is provided with several pressure balance holes that connect the inside and outside of the spiral feeding tube.

4. The biomass pellet combustion machine according to claim 2, wherein The sealing plate includes a first sealing section and a second sealing section; wherein: The air distribution chamber is configured to connect the first sealing section and the second sealing section on a first surface; The combustion chamber air chamber is configured to connect to the second side of the first sealing section, and the combustion chamber is configured to connect to the second side of the second sealing section.

5. The biomass pellet combustion machine according to claim 3, wherein The combustion chamber has an inner wall, and the inner wall is provided with ventilation holes that connect the combustion chamber and the combustion chamber air chamber.

6. The biomass pellet combustion machine according to claim 5, wherein The air supply drive is configured as an air supply blower, the air distribution chamber is configured as a sealed space consisting of a sealing plate and a shell, the air supply blower is located at the first end of the sealed space, and the combustion chamber air chamber is connected to the second end of the sealed space.

7. The biomass pellet combustion machine according to claim 6, wherein The pressure balance hole is configured to connect the air distribution chamber and the spiral feed pipe, the ventilation hole connects the combustion chamber and the combustion chamber air chamber, and the air distribution chamber connects to the combustion chamber air chamber, so that the spiral feed pipe and the combustion chamber always maintain the same pressure.

8. The biomass pellet combustion machine according to claim 4, wherein Also includes: A coking device, comprising an electric push rod and a coking rod fixed to the mounting plate; The first end of the focus pusher is connected to the electric pusher. The second end of the coke pusher rod passes through the air distribution chamber and is arranged through the sealing plate via a guide tube on the sealing plate.

9. The biomass pellet combustion machine according to claim 1, wherein The cross-section of the combustion chamber is configured in a parabolic shape, and the expression for the parabolic shape is as follows: ； The range of the equation coefficient 'a' is 50-500.

Images