A self-cleaning powder biomass combustion device

Abstract

The present application relates to the field of biomass energy utilization, and provides a self-cleaning powder biomass combustion device, which comprises a combustion furnace, a central shaft group, a ventilation base, a driving assembly, a coking remover and a wind cap cylinder, the coking remover is arranged on the central shaft group and can rotate with the central shaft group and move axially relative to the central shaft group, the radial end of the coking remover is in contact with the inner circumferential wall of the combustion chamber, and is used for removing the coking of the inner circumferential wall of the combustion chamber when the central shaft group rotates; the axial two sides of the coking remover are used for being in contact with the axial two ends of the combustion chamber respectively, and are used for removing the coking of the axial ends of the combustion chamber when the central shaft group rotates, the biomass combustion device provided by the present application is simple in structure, can automatically remove the coking generated in the combustion process, and can uniformly distribute the powder biomass and the like in the combustion furnace.

Description

Technical Field

[0001] This invention relates to the field of biomass energy utilization, and in particular to a combustion device for self-cleaning powdered biomass. Background Technology

[0002] With socio-economic development, the demand for energy is constantly expanding. Traditional fossil fuels are non-renewable, with limited reserves, and their use causes environmental problems such as the greenhouse effect. Biomass energy, derived from plant photosynthesis, is renewable, abundant, widely distributed, and produces little pollution. Large-scale utilization of biomass energy is one of the effective ways to solve the energy and environmental crisis.

[0003] Combustion of pulverized biomass effectively increases the contact between biomass and oxygen, thus improving combustion efficiency. However, biomass combustion produces a large amount of ash and residue, and prolonged combustion can lead to coking. Ash and coking can clog ventilation openings, affecting the utilization rate of biomass energy. Coking can also adhere to the inside of the combustion furnace, shortening its lifespan. Removing coking from the furnace is difficult, and manual removal is costly and ineffective. Most existing biomass combustion furnaces do not have an automatic coking removal function or have limited effectiveness in removing it. Based on these reasons, this invention proposes a self-cleaning combustion device for powdered biomass. Summary of the Invention

[0004] The purpose of this invention is to provide a self-cleaning combustion device for powdered biomass, so as to solve the problems of difficult cleaning, poor effect and high cost of coking products generated during the individual or co-combustion of biomass in the combustion device.

[0005] The present invention provides a self-cleaning powdered biomass combustion device, comprising: a combustion furnace, a central shaft assembly, a ventilation base, a drive assembly, a coking remover, a wind cap, a feed inlet, an ash outlet, and a support.

[0006] The combustion furnace has a cylindrical combustion chamber with its central axis extending at an incline. The central shaft assembly is disposed within the combustion chamber and is coaxially arranged with the combustion chamber. The central shaft assembly is rotatably engaged with the combustion furnace.

[0007] The feed inlet and the ash outlet are located in the combustion furnace and communicate with the combustion chamber;

[0008] The air cap is located at the bottom of the combustion chamber and communicates with the inner cavity of the ventilation base. The inner cavity of the ventilation base is used to communicate with the air supply system. The air supply system supplies air or oxygen to the inner cavity of the ventilation base. The air or oxygen is transported into the combustion chamber through the air cap to ensure the complete combustion of biomass.

[0009] The drive assembly is disposed outside the combustion chamber and is used to drive the central shaft assembly to rotate;

[0010] The coking remover is mounted on the central shaft assembly and can rotate with the central shaft assembly and move axially relative to the central shaft assembly; the coking remover is configured such that: the radial end of the coking remover contacts the inner peripheral wall of the combustion chamber, for removing coking material from the combustion furnace sidewall of the combustion chamber when rotating with the central shaft assembly; the axial sides of the coking remover are respectively used to contact the axial ends of the combustion chamber, for removing coking material from the axial ends of the combustion chamber when rotating with the central shaft assembly.

[0011] Optionally, the coking remover includes a connecting rod and a scraper;

[0012] The scraper head is disposed at one radial end of the connecting rod for contacting the inner peripheral wall of the combustion chamber. The scraper head has an arc surface that conformally fits the inner peripheral wall of the combustion chamber and a chamfered surface connected to one circumferential side of the arc surface. The chamfered surface is configured such that, along the circumferential direction of the combustion chamber, from the direction close to the arc surface to the direction away from the arc surface, the radial gap between the chamfered surface and the inner peripheral wall of the combustion chamber gradually increases.

[0013] An overpressure prevention hole is provided on the beveled surface. The overpressure prevention hole is connected to one side of the connecting rod in the axial or circumferential direction. It is used to guide the biomass between the beveled surface and the inner peripheral wall of the combustion chamber into the overpressure prevention hole, so as to reduce the pressure between the beveled surface and the inner peripheral wall of the combustion chamber.

[0014] Optionally, the connecting rod has grooves at both ends along the axial direction, the grooves extend radially, and the overpressure prevention hole communicates with the grooves to allow biomass located in the overpressure prevention hole to enter the grooves.

[0015] Optionally, two overpressure protection holes are provided, and the two overpressure protection holes are respectively connected to the two trenches.

[0016] Optionally, the axial end of the connecting rod is provided with corrugated teeth, which are located at the two circumferential edges of the end.

[0017] Optionally, the ventilator includes a sliding cap, a base, and an elastic element. The base is embedded in the bottom of the combustion chamber, and the upper end face of the base is aligned with the bottom of the combustion chamber. The upper end of the base has a mounting groove arranged radially along the combustion chamber. The sliding cap is conformally slidably fitted with the mounting groove. The sliding cap has an air outlet. The elastic element is disposed in the mounting groove to provide an elastic force for the sliding cap to slide out of the mounting groove. The base has a bottom hole, and the air outlet communicates with the inner cavity of the ventilation base through the bottom hole.

[0018] The sliding cap is configured such that: when the sliding cap is subjected to the elastic force of the elastic element, and the head of the sliding cap slides out of the mounting groove, the air outlet is located outside the mounting groove and communicates with the combustion chamber; when the scraper rotates with the central shaft assembly to the bottom of the combustion chamber, the oblique side of the scraper first presses against the sliding cap and drives the sliding cap to retract into the mounting groove, and the air outlet is located inside the mounting groove and sealed by the inner wall of the mounting groove.

[0019] Optionally, the vent is opened along a sliding direction perpendicular to the sliding cap.

[0020] Optionally, the head edge of the sliding cap is arc-shaped.

[0021] Optionally, the central shaft assembly includes a translation screw and a rotating rod extending axially along the combustion chamber; the rotating rod is rotatably disposed within the combustion chamber, and the rotation axis of the rotating rod is collinear with the central axis of the combustion chamber; the translation screw has external threads, and the coking remover is threadedly rotatably engaged with the translation screw; the cross-section of the rotating rod is polygonal, and the coking remover is axially slidingly engaged with the rotating rod with a single degree of freedom; the rotating rod has an internal cavity, and the translation screw is rotatably disposed within the cavity about its own central axis.

[0022] Optionally, multiple connecting rods are provided, and each connecting rod is arranged at equal intervals along the circumference of the combustion chamber, and each connecting rod is provided with a scraper head.

[0023] The beneficial effects of this invention are as follows: The device is equipped with a central shaft assembly and a coking remover inside the combustion furnace. The coking remover can perform axial translational and rotational movements along the central shaft assembly, thereby removing coking material inside the combustion furnace, improving the combustion efficiency of biomass, reducing safety hazards during the operation of the combustion furnace, and increasing the service life of the combustion furnace. This invention uses a mechanical method to remove coking material after the combustion of biomass in the combustion furnace, and has the advantages of simple structure, low labor cost, and reliable cleaning effect. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the device;

[0025] Figure 2 This is a schematic diagram of the coking removal device.

[0026] Figure 3 This is a partial view of the shaving head;

[0027] Figure 4 Perspective view of the scraper head

[0028] Figure 5 This is a schematic diagram of the windproof hood structure;

[0029] Figure 6 This is a schematic diagram of the transmission bearing structure.

[0030] The reference numerals in the attached figures are as follows:

[0031] 1-Side wall of the combustion furnace;

[0032] 2-Combustion furnace end wall; 3-Driven pulley; 4-Power transmission belt; 5-Drive assembly;

[0033] 6-Central shaft assembly; 61-Transfer screw; 62-Rotating rod; 63-Connecting sleeve;

[0034] 7-Coking material remover;

[0035] 71-Overpressure protection hole; 72-Connecting rod; 73-Scraper; 74-Groove; 75-Threaded hole; 76-Moving hole; 77-Wave tooth; 78-Heating device; 79-Beveled surface; 710-Arc surface;

[0036] 8-Combustion furnace end wall 2; 9-Ventilation base;

[0037] 10-Wind cap; 11-Feed inlet; 12-Ash outlet; 13-Bracket; 14-Sliding cap; 15-Base; 16-Air outlet; 17-Elastic element; 18-Bottom hole. Detailed Implementation

[0038] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a further detailed explanation of the self-cleaning powdered biomass combustion device proposed in this invention. The advantages and features of this invention will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this invention.

[0039] As used in this invention, the singular forms “a,” “an,” and “the” include plural objects; the term “or” is generally used to mean “and / or”; the term “a number” is generally used to mean “at least one”; and the term “at least two” is generally used to mean “two or more”. Furthermore, the terms “first,” “second,” and “third” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with “first,” “second,” or “third” may explicitly or implicitly include one or at least two of that feature. Additionally, as used in this invention, “installed,” “connected,” “joined,” and “set” on one element by another should be interpreted broadly, generally indicating only a connection, coupling, mating, or transmission relationship between the two elements, which can be direct or indirect through an intermediate element. They should not be construed as indicating or implying a spatial positional relationship between the two elements, i.e., one element can be located inside, outside, above, below, or to one side of another element, unless otherwise explicitly stated. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances. Furthermore, directional terms such as above, below, up, down, upward, downward, left, right, etc., are used relative to exemplary embodiments as shown in the figures, with upward or up direction pointing towards the top of the corresponding figure, and downward or down direction pointing towards the bottom of the corresponding figure.

[0040] Combined with appendix Figure 1 A self-cleaning powdered biomass combustion device includes: a combustion furnace, a central shaft assembly 6, a ventilation base 9, a drive assembly 5, a coking remover 7, a wind cap 10, a feed inlet 11, an ash outlet 12, and a support 13.

[0041] The combustion furnace is mounted on a bracket 13, which has two supporting members of different heights. The axial ends of the combustion furnace are respectively mounted on the two supporting members. The combustion furnace has a cylindrical structure and a cylindrical combustion chamber. The central axis of the combustion chamber extends obliquely. The central shaft assembly 6 is disposed within the combustion chamber and coaxially arranged with the combustion chamber. The central shaft assembly 6 is rotatably engaged with the combustion furnace.

[0042] The feed inlet 11 and the ash outlet 12 are located in the combustion furnace and communicate with the combustion chamber; sealing caps should be provided on the feed inlet 11 and the ash outlet 12 to open or close the feed inlet 11 and the ash outlet 12.

[0043] The air cap 10 is located at the bottom of the combustion chamber and communicates with the inner cavity of the ventilation base 9. The inner cavity of the ventilation base 9 is used to communicate with the air supply system. The ventilation base 9 has a rectangular box structure and is fixed to the bottom of the combustion furnace. The air outlet of the external air supply system, such as a fan or air compressor, is connected to the inner cavity of the ventilation base 9 so that the airflow is delivered to the air cap 10 through the ventilation base 9 and then delivered to the inside of the combustion chamber through the air cap 10 to ensure complete combustion of biomass.

[0044] The drive assembly 5 is located outside the combustion chamber and mounted on the bracket 13, and drives the central shaft assembly 6 to rotate via the power transmission belt 4. The drive assembly 5 can be a single motor or a combination of a motor and a reducer. The drive assembly 5 drives the drive pulley to rotate, and the drive pulley drives the driven pulley 3 to rotate via the power transmission belt 4. The driven pulley is mounted on the central shaft assembly 6 and drives the central shaft assembly 6 to rotate. The central shaft assembly 6 drives the coking removal device 7 to rotate.

[0045] The coking remover 7 is mounted on the central shaft assembly 6 and can rotate with the central shaft assembly 6 and move axially relative to the central shaft assembly 6, so that the biomass in the combustion furnace is more evenly distributed and the combustion of biomass is promoted. The coking remover 7 is configured such that: the radial end of the coking remover 7 contacts the inner peripheral wall of the combustion chamber, and is used to remove coking material on the side wall 1 of the combustion furnace in the combustion chamber when rotating with the central shaft assembly 6; the axial sides of the coking remover 7 are used to contact the two axial ends of the combustion chamber respectively, and are used to remove coking material on the combustion furnace end wall 1 2 and the combustion furnace end wall 2 8 of the combustion chamber when rotating with the central shaft assembly 6.

[0046] Combined with appendix Figure 2 , Figure 3 and Figure 4 The coking remover 7 includes a connecting rod 72 and a scraper head 73;

[0047] The scraper head 73 is disposed at one radial end of the connecting rod 72 for contacting the inner peripheral wall of the combustion chamber. The scraper head 73 has an arc surface 710 that conforms to the inner peripheral wall of the combustion chamber and a chamfered surface 79 connected to one circumferential side of the arc surface 710. The chamfered surface 79 is configured such that, along the circumference of the combustion chamber, from the direction close to the arc surface 710 to the direction away from the arc surface 710, the radial gap between the chamfered surface 79 and the inner peripheral wall of the combustion chamber gradually increases.

[0048] When the coking remover 7 rotates, the oblique surface 79 on the scraper head 73 should rotate in the same direction as the rotation. Therefore, during the rotation, the space between the oblique surface 79 and the inner wall of the combustion chamber gradually decreases, causing the biomass located between the oblique surface 79 and the inner wall of the combustion chamber to be compressed. The compressed biomass will move along the inner wall of the combustion chamber with the scraper head 73, and then rub against the coking on the inner wall of the combustion chamber to remove the coking. The removed coking will be mixed in with the biomass and discharged from the combustion chamber with the ash after the biomass is burned.

[0049] The scraper head 73 is equipped with a heating device 78, which can heat the scraper head 73 to help remove coke; the heating device 78 can be a resistance heating device.

[0050] An overpressure prevention hole 71 is provided on the chamfered surface 79. The overpressure prevention hole 71 is a tapered hole with a larger outer diameter and a smaller inner diameter. The overpressure prevention hole 71 is connected to one side of the connecting rod 72 in the axial or circumferential direction. It is used to guide the biomass between the chamfered surface 79 and the inner peripheral wall of the combustion chamber into the overpressure prevention hole 71 to reduce the pressure between the chamfered surface 79 and the inner peripheral wall of the combustion chamber.

[0051] The connecting rod 72 has grooves 74 at both ends along the axial direction, and the grooves 74 extend radially. The overpressure prevention hole 71 connects to the groove 74, allowing biomass entering the overpressure prevention hole 71 to enter the groove 74. The outer radial end of the groove 74 is closed by a scraper 73. The groove 74 is rectangular. The groove 74 allows biomass in the overpressure prevention hole 71 to enter the groove 74, preventing excessive compression of the biomass in the overpressure prevention hole 71. On the other hand, when one axial end of the connecting rod 72 is in contact with the axial end face of the combustion chamber, the opening of the groove 74 is closed, and the groove 74 and the end face of the combustion chamber form a closed chamber. At this time, the biomass entering the groove through the overpressure prevention hole 71 moves with the connecting rod 72 in the closed chamber, and the biomass wipes the end face of the combustion chamber and carries away the coking material. At this time, the coking material is mixed with the biomass and is discharged from the combustion chamber along with the ash as the biomass burns.

[0052] Two overpressure protection holes 71 are provided, and the two overpressure protection holes 71 are respectively connected to the two grooves 74.

[0053] The axial end of the connecting rod 72 is provided with wavy teeth, which are located on both sides of the end along the circumferential direction.

[0054] The ventilator 10 includes a sliding cap 14, a base 15, and an elastic element 17. The base 15 is cylindrical and is embedded in the bottom of the combustion chamber. The upper end face of the base 15 is aligned with the bottom of the combustion chamber. The upper end of the base 15 has a mounting groove arranged radially along the combustion chamber. The mounting groove is cylindrical. The sliding cap 14 is cylindrical and adapted to the inner diameter of the mounting groove. The bottom of the sliding cap 14 is open. The sliding cap 14 slides in conformal fit with the mounting groove. The sliding cap 14 is provided with an air outlet 16. The elastic element 17 is disposed in the mounting groove to provide elastic force for the sliding cap 14 to slide its head out of the mounting groove. The base 15 is provided with a bottom hole 18, which communicates with the mounting groove. The inner cavity of the ventilation base 9 communicates with the bottom hole 18. In addition, the air outlet 16 communicates with the bottom hole 18 through the mounting groove.

[0055] The elastic element can be a cylindrical helical spring, a disc spring, a leaf spring, or other elastic structures.

[0056] The sliding cap 14 is configured such that: when the sliding cap 14 is subjected to the elastic force of the elastic member 17, and the head of the sliding cap 14 slides out of the mounting groove, the air outlet 16 is located outside the mounting groove and communicates with the combustion chamber; when the scraper head 73 rotates with the central shaft assembly 6 to the bottom of the combustion chamber, the oblique cut surface 79 side of the scraper head 73 first presses against the sliding cap 14 and drives the sliding cap 14 to retract into the mounting groove, and the air outlet 16 is located in the mounting groove and sealed by the inner wall of the mounting groove.

[0057] The vent 13 is opened along the sliding direction perpendicular to the sliding cap 11; in the free state, the vent 13 extends out of the assembly groove along with the sliding cap 11; the free state is the state when there is no external force acting on it, and it is only subjected to the elastic force of the elastic element.

[0058] The head edge of the wind cap 10 is arc-shaped. When the scraper head 73 rotates to the bottom of the combustion chamber, its beveled surface 79 first presses against the arc-shaped edge of the sliding cap 14 head. As the scraper head 73 rotates, the sliding cap 14 is completely pressed into the assembly groove. At this time, the inner wall of the assembly groove has a scraping effect on the outer wall of the sliding cap 14 to remove the coking material on the outer wall of the sliding cap 14.

[0059] Combined with appendix Figure 6The central shaft assembly 6 includes a translation screw 61 and a rotating rod 62 extending axially along the combustion chamber. The rotating rod 62 is rotatably disposed within the combustion chamber, and its rotation axis is collinear with the central axis of the combustion chamber. The translation screw 61 has external threads, and the coking remover 7 is threadedly engaged with the translation screw 61 through a threaded hole 75. The rotating rod 62 has a polygonal cross-section to improve its torsional stiffness and facilitate the installation of the translation screw 61. The cross-section of the rotating rod 62 can be, for example, rectangular or hexagonal. The two axial ends of the rotating rod 62 are cylindrical and rotatably mounted at the two axial ends of the combustion furnace. The coking remover 7 is axially slidingly engaged with the rotating rod 62 through a single-degree-of-freedom sliding hole 76, the shape of which is adapted to the cross-section of the rotating rod 62. The rotating rod 62 is provided with a mounting groove. The translation screw 61 is rotatable around its own central axis and is installed in the mounting groove. One end of the translation screw 61 extends to the axial outside of the rotating rod 62 and extends out of the combustion furnace and is directly connected to the motor. At this time, the translation screw 61 can be driven to rotate by the motor. The translation screw 61 is also threadedly connected to the coking removal device 7, so it can drive the coking removal device 7 to move axially.

[0060] In addition, such as Figure 6 As shown, a connecting cylinder 63 can be fixed in the middle of the coking material remover 7. The connecting cylinder 63 is axially slidingly fitted with the rotating rod 62 with a single degree of freedom. The interior of the connecting cylinder 63 has a protrusion that is threadedly fitted with the translation screw 61.

[0061] Additionally, a torque sensor can be installed on the translation screw 61. Torque detection is used to identify whether the coking remover 7 is in contact with the axial inner wall of the combustion chamber. If the coking remover 7 is in contact with the axial inner wall of the combustion chamber, it cannot continue axial movement, and the translation screw 61 is locked in rotation. If the motor continues to drive the translation screw 61, its torque increases due to the increased load. Therefore, if the torque detected by the torque sensor is greater than the set value, it indicates that the axial inner wall of the combustion chamber is in contact, and the motor stops at this time to stop driving the translation screw 61 to rotate.

[0062] Multiple connecting rods 72 are provided, and each connecting rod 72 is arranged at equal intervals along the circumference of the combustion chamber. Each connecting rod 72 is provided with a scraper head 73.

[0063] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0064] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A self-cleaning powdered biomass combustion device, characterized in that, include: Combustion furnace, central shaft assembly, ventilation base, drive assembly, coking remover, air hood, feed inlet, ash outlet, and support frame; The combustion furnace is mounted on the support frame. The combustion furnace has a cylindrical combustion chamber with its central axis extending at an incline. The central shaft assembly is located inside the combustion chamber and is coaxially arranged with the combustion chamber. The central shaft assembly is rotatably engaged with the combustion furnace. The feed inlet and the ash outlet are located in the combustion furnace and communicate with the combustion chamber; The air hood is located at the bottom of the combustion chamber and communicates with the inner cavity of the ventilation base, the inner cavity of the ventilation base being used to communicate with the air supply system; The drive assembly is disposed outside the combustion chamber and is used to drive the central shaft assembly to rotate relative to the combustion furnace; The coking remover is mounted on the central shaft assembly and can rotate with the central shaft assembly and move axially relative to the central shaft assembly; the coking remover is configured such that: the radial end of the coking remover contacts the inner peripheral wall of the combustion chamber, for removing coking material from the side wall of the combustion furnace inside the combustion chamber when rotating with the central shaft assembly; the axial sides of the coking remover are respectively used to contact the axial ends of the combustion chamber, for removing coking material from the axial ends of the combustion chamber when rotating with the central shaft assembly; The coking remover includes a connecting rod and a scraper head; The scraper head is disposed at one radial end of the connecting rod for contacting the inner peripheral wall of the combustion chamber. The scraper head has an arc surface that conformally fits the inner peripheral wall of the combustion chamber and a chamfered surface connected to one circumferential side of the arc surface. The chamfered surface is configured such that, along the circumferential direction of the combustion chamber, from the direction close to the arc surface to the direction away from the arc surface, the radial gap between the chamfered surface and the inner peripheral wall of the combustion chamber gradually increases. An overpressure prevention hole is provided on the beveled surface. The overpressure prevention hole is connected to one side of the connecting rod in the axial or circumferential direction. It is used to guide the biomass between the beveled surface and the inner peripheral wall of the combustion chamber into the overpressure prevention hole to reduce the pressure between the beveled surface and the inner peripheral wall of the combustion chamber. The connecting rod has grooves at both ends along the axial direction, and the grooves extend radially. The overpressure prevention hole is connected to the groove, so as to allow the biomass located in the overpressure prevention hole to enter the groove. The ventilator includes a sliding cap, a base, and an elastic element. The base is embedded in the bottom of the combustion chamber, and the upper end face of the base is aligned with the bottom of the combustion chamber. The upper end of the base has a mounting groove arranged radially along the combustion chamber. The sliding cap is conformally slidably fitted with the mounting groove. The sliding cap has an air vent. The elastic element is disposed in the mounting groove to provide an elastic force for the sliding cap to slide out of the mounting groove. The base has a bottom hole, and the air vent communicates with the inner cavity of the ventilation base through the bottom hole. The sliding cap is configured such that: when the sliding cap is subjected to the elastic force of the elastic element, and the head of the sliding cap slides out of the mounting groove, the air outlet is located outside the mounting groove and communicates with the combustion chamber; when the scraper rotates with the central shaft assembly to the bottom of the combustion chamber, the oblique side of the scraper first presses against the sliding cap and drives the sliding cap to retract into the mounting groove, and the air outlet is located inside the mounting groove and sealed by the inner wall of the mounting groove.

2. The self-cleaning powdered biomass combustion device as described in claim 1, characterized in that, Two overpressure protection holes are provided, and the two overpressure protection holes are respectively connected to the two grooves.

3. The self-cleaning powdered biomass combustion device as described in claim 1, characterized in that, The connecting rod is provided with wavy teeth at its axial end, and the wavy teeth are located at the two circumferential edges of the end.

4. The self-cleaning powdered biomass combustion device as described in claim 1, characterized in that, The vent is opened along the sliding direction perpendicular to the sliding cap.

5. The self-cleaning powdered biomass combustion device as described in claim 1, characterized in that, The head edge of the sliding cap is curved.

6. The self-cleaning powdered biomass combustion device as described in claim 1, characterized in that, The central shaft assembly includes a translation screw and a rotating rod extending axially along the combustion chamber; the rotating rod is rotatably disposed within the combustion chamber, and the rotation axis of the rotating rod is collinear with the central axis of the combustion chamber; the translation screw has external threads, and the coking remover is threadedly rotatably engaged with the translation screw; the cross-section of the rotating rod is polygonal, and the coking remover is axially slidingly engaged with the rotating rod with a single degree of freedom; the rotating rod has an internal cavity, and the translation screw is rotatably disposed within the cavity about its own central axis.

7. The self-cleaning powdered biomass combustion device as described in claim 1, characterized in that, The connecting rods are provided in multiple ways, and each connecting rod is arranged at equal intervals along the circumference of the combustion chamber. Each connecting rod is provided with a scraper head.

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