Biomass pellet combustion machine with slag cleaning function

Abstract

This utility model discloses a biomass pellet burner with a slag-cleaning function, including a body and a cover on the body, as well as a hopper, a fan, a combustion assembly, an ash collection bin, and a slag-cleaning section. The hopper is located on the upper part of the body; the combustion assembly is connected to the lower part of the hopper; one end of the combustion assembly is fixedly connected to the fan, and the other end extends outward from the outside of the body; the ash collection bin is located below the combustion assembly; the slag-cleaning section is located on the combustion assembly; the slag-cleaning section is slidable relative to the combustion assembly. The advantages of this utility model are: the mesh design at the lower part of the combustion cylinder combined with the slidable slag-cleaning section (arc-shaped scraper) effectively solves the problem of ash and slag accumulation and caking at the grate (mesh) during the operation of the biomass pellet burner, leading to poor ventilation and reduced combustion efficiency. The manual or automatic slag-cleaning process is simple and quick, and can be carried out without stopping the machine for cooling, significantly improving the continuity of equipment operation and maintenance convenience.

Description

Technical Field

[0001] This utility model relates to the field of biomass pellet combustion technology, and in particular to a biomass pellet burner with slag removal function. Background Technology

[0002] A biomass pellet burner is an environmentally friendly thermal energy device that uses compressed pellets of wood, straw, etc., as fuel, automatically feeds and ignites them, and generates heat through efficient combustion with low emissions. However, the combustion chamber of existing biomass pellet burners often suffers from slag adhesion, affecting combustion efficiency and leading to incomplete combustion of the biomass pellets. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a biomass pellet burner with slag removal function.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] A biomass pellet burner with slag removal function includes a body and a cover on the body, and also includes a hopper, a blower, a combustion assembly, an ash collection hopper, and a slag removal section; the hopper is located on the upper part of the body; the combustion assembly is connected to the lower part of the hopper; one end of the combustion assembly is fixedly connected to the blower, and the other end extends out of the outer side of the body; the ash collection hopper is provided below the combustion assembly; the slag removal section is provided on the combustion assembly; the slag removal section can slide relative to the combustion assembly.

[0006] Furthermore, the lower end of the hopper is connected to the combustion assembly via a discharge pipe; a valve is provided on the discharge pipe.

[0007] Furthermore, the combustion assembly includes a combustion cylinder, an incline plate, and an igniter; the incline plate is inclinedly disposed in the combustion cylinder below the material discharge point of the hopper; and the igniter is fixed to the lower surface of the incline plate.

[0008] Furthermore, the combustion cylinder has two notches at the lower left and right ends; the lower part of the combustion cylinder between the two notches has a mesh-like structure; and a rectangular groove for the slag removal section to move horizontally is provided above the mesh-like structure of the combustion cylinder.

[0009] Furthermore, the slag removal section includes a horizontal bar, a vertical bar, and an arc-shaped scraper; the horizontal bar passes through two rectangular slots symmetrically arranged in the combustion cylinder; the middle of the horizontal bar is fixedly connected to the vertical bar; the lower end of the vertical bar is fixedly connected to the middle of the arc-shaped scraper; the arc-shaped scraper is in contact with the mesh-like structure at the bottom of the combustion cylinder.

[0010] Furthermore, the fan is connected to the outside of the machine body through a fan cover.

[0011] Furthermore, a door cover for cleaning is provided at the lower end of the machine body near the ash collection bin.

[0012] The beneficial effects of this utility model are:

[0013] This invention features a lower mesh design for the combustion chamber, combined with a sliding ash removal section (arc-shaped scraper), effectively solving the problems of ash accumulation and caking at the grate (mesh) in biomass pellet burners, leading to poor ventilation and reduced combustion efficiency. The manual or automatic ash removal process is simple and quick, requiring no shutdown for cooling, significantly improving the continuity of equipment operation and ease of maintenance. The inclined baffle facilitates fuel distribution and air circulation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0016] Figure 3 This is a cross-sectional view showing the slag removal section and the combustion cylinder working together.

[0017] In the picture,

[0018] 1-Main body, 2-Cover body, 3-Blouse, 4-Fan, 5-Combustion assembly, 6-Ash collection bin, 7-Slag removal unit;

[0019] 31-Feed pipe, 32-Valve;

[0020] 41-Wind shield;

[0021] 51-Combustion cylinder, 52-Inclined plate, 53-Igniter;

[0022] 511 - Notch, 512 - Rectangular groove;

[0023] 71-Horizontal bar, 72-Vertical bar, 73-Arc-shaped scraper. Detailed Implementation

[0024] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0025] Reference Figure 1-3As shown, a biomass pellet burner with slag removal function includes a body 1 and a cover 2 located on the body 1, and also includes a hopper 3, a blower 4, a combustion assembly 5, an ash collection bin 6, and a slag removal section 7; the hopper 3 is located on the upper part of the body 1; the combustion assembly 5 is connected to the lower part of the hopper 3; one end of the combustion assembly 5 is fixedly connected to the blower 4, and the other end extends out of the outer side of the body 1; the ash collection bin 6 is provided below the combustion assembly 5; the slag removal section 7 is provided on the combustion assembly 5; the slag removal section 7 can slide relative to the combustion assembly 5.

[0026] It should be noted that the body 1 constitutes the main frame and outer shell of the burner, preferably welded from steel plates, possessing sufficient structural strength and heat insulation performance. The interior of the body 1 forms a space to accommodate other components. An openable cover 2 is provided on the top of the body 1 for feeding biomass pellets; the cover 2 is preferably connected by a hinge and equipped with a locking device (not shown). A hopper 3 is fixedly installed on the upper part of the body 1 for storing biomass pellet fuel (e.g., wood pellets, straw pellets, etc.). The hopper 3 is preferably funnel-shaped or rectangular, with a feed pipe 31 connected downwards at its bottom center or an appropriate location.

[0027] Specifically, the lower end of the hopper 3 is connected to the combustion assembly 5 via a feed pipe 31; a valve 32 is installed on the feed pipe 31. The diameter of the feed pipe 31 is preferably 80mm to 150mm to ensure smooth fuel flow and prevent clogging. The valve 32 on the feed pipe 31 is used to control the supply and flow regulation of fuel from the hopper 3 to the combustion assembly 5. The valve 32 is preferably an electric butterfly valve or a rotary feed valve, which can be automatically opened and closed or its opening degree adjusted by a control system (not shown). The specific type of valve 32 (such as a manual gate valve, a star-shaped discharge valve, etc.) can be selected according to actual needs.

[0028] Specifically, the combustion assembly 5 includes a combustion cylinder 51, an inclined plate 52, and an igniter 53; the inclined plate 52 is inclinedly disposed in the combustion cylinder 51 below the material discharge point of the hopper 3; the igniter 53 is fixed to the lower surface of the inclined plate 52. Two notches 511 are provided at the left and right ends of the lower part of the combustion cylinder 51; the lower part of the combustion cylinder 51 between the two notches 511 has a mesh-like structure; a rectangular groove 512 for the slag removal section 7 to move horizontally is provided above the mesh-like structure of the combustion cylinder 51. The combustion cylinder 51 is a cylindrical structure arranged horizontally or slightly inclined (preferably lower at the front and higher at the back, with an inclination angle of 0-5°), its front end ( Figure 1 The middle left side is connected to the fan 4, and the rear end ( Figure 1The combustion cylinder 51 extends outward from the outer side of the body 1 (right side) to form the outlet of the combustion flame. The combustion cylinder 51 is preferably made of high-temperature resistant stainless steel (such as 310S) or heat-resistant cast iron, with a wall thickness preferably of 5-10 mm. The length of the combustion cylinder 51 is preferably 800 mm to 1500 mm, and the inner diameter is preferably 300 mm to 600 mm. The tilting plate 52 is a key component located inside the combustion cylinder 51, directly below the discharge pipe 31. The tilting plate 52 is arranged inclined along the longitudinal direction (length direction) of the combustion cylinder 51, with its high end close to the outlet of the discharge pipe 31 and its low end facing the rear end of the combustion cylinder 51. The tilting angle of the tilting plate 52 (see...) Figure 1 The angle is preferably between 35° and 45° (e.g., 40°). This angle design facilitates the fuel to slide down and spread out along the plate surface under gravity, while providing space for air circulation. The tilt plate 52 is preferably made of a high-temperature resistant and wear-resistant material (such as heat-resistant steel plate or ceramic plate). The igniter 53 is fixedly installed on the lower surface of the tilt plate 52 (i.e., on the side facing the bottom of the combustion chamber 51), preferably located in the middle or rear part of the tilt plate 52. The igniter 53 is preferably a glow plug type or electrode discharge type igniter, whose power line and control line (not shown) are led out through an opening in the wall of the combustion chamber 51 and connected to the control system. The igniter 53 is used to ignite the fuel accumulated in the area below the tilt plate 52. At the lower part of the combustion chamber 51, near the left and right ends, there is a notch 511. These two notches 511 extend a certain length (preferably 100mm to 200mm) along the longitudinal direction (length direction) of the combustion chamber 51, reaching or approaching the bottom of the chamber. The notch 511 allows the ash from combustion to fall. The lower region of the combustion chamber 51 between the two notches 511 (i.e., the region directly below the inclined plate 52) has a mesh-like structure. This mesh-like structure consists of uniformly distributed circular or square holes, preferably with a hole diameter of 8 mm to 12 mm (e.g., 10 mm), and a hole spacing (center-to-center distance) preferably 1.5 to 2 times the hole diameter (e.g., 15 mm to 20 mm). The total length L1 of the mesh-like region preferably accounts for 50% to 70% of the total length of the combustion chamber 51. This mesh-like structure allows the fine ash produced by combustion to fall smoothly, while supporting the continued combustion of unburned large fuel particles. Above the mesh-like structure region of the combustion chamber 51 (i.e., the top region of the side wall of the chamber), two rectangular grooves 512 are symmetrically formed along the longitudinal direction of the chamber. The length L2 of the rectangular grooves 512 is preferably slightly smaller than the length L1 of the mesh-like region (e.g., 80% to 90% of L1), and the width W is preferably 15 mm to 30 mm (e.g., 20 mm). The rectangular groove 512 provides a guiding channel for the movement of the slag removal section 7.

[0029] The slag removal section 7 is the core component of this invention for achieving convenient slag removal. The slag removal section 7 includes a horizontal bar 71, a vertical bar 72, and an arc-shaped scraper 73. The horizontal bar 71 passes through two symmetrically arranged rectangular slots 512 in the combustion chamber 51. The vertical bar 72 is fixedly connected to the middle of the horizontal bar 71. The lower end of the vertical bar 72 is fixedly connected to the middle of the arc-shaped scraper 73. The arc-shaped scraper 73 contacts the mesh-like structure at the bottom of the combustion chamber 51. The horizontal bar 71 is a rigid rod (preferably round or square steel), with both ends passing through the symmetrically arranged rectangular slots 512 on both sides of the combustion chamber 51, and can slide longitudinally within the slots. The length of the horizontal bar 71 should be greater than the outer diameter of the combustion chamber 51 so that both ends can reliably rest on the rectangular slots 512. Limiting blocks (not shown) or operating handles (not shown) can be provided at both ends of the horizontal bar 71 after protruding from the machine body 1 to prevent it from completely sliding into the combustion chamber 51 and to facilitate manual operation. The vertical rod 72 is a member perpendicular (or nearly perpendicular) to the horizontal rod 71, with its upper end fixedly connected to the middle of the horizontal rod 71 (e.g., by welding or bolting). The arc-shaped scraper 73 is fixedly connected to the lower end of the vertical rod 72 (e.g., by welding). The arc of the arc-shaped scraper 73 matches the arc of the inner wall of the combustion chamber 51, and its outer edge is designed to fit tightly against the inner surface of the mesh-like structure at the bottom of the combustion chamber 51. The width of the arc-shaped scraper 73 (along the axial direction of the combustion chamber) is preferably 50 mm to 100 mm. The arc-shaped scraper 73 is preferably made of a high-temperature resistant and wear-resistant material (such as heat-resistant steel plate), and its lower edge may be designed as a cutting edge to improve the slag scraping effect. The working principle of the slag removal section 7: When it is necessary to remove ash or coke accumulated on the mesh structure, the operator (or through the drive mechanism) manually pulls the horizontal bar 71, causing the vertical bar 72 and the arc-shaped scraper 73 to move longitudinally along the combustion cylinder 51 (i.e., along the direction of the rectangular groove 512). During the movement, the cutting edge of the arc-shaped scraper 73 is in close contact with the inner surface of the mesh, scraping up the ash adhering to the mesh holes and surface and pushing it towards the rear end or the side notches 511 of the combustion cylinder 51. Finally, the ash falls into the ash collection bin 6 below through the notches 511 or mesh holes. The slag removal stroke should cover the entire mesh area length L1, which can be limited by the length L2 of the rectangular groove 512.

[0030] Specifically, the blower 4 is connected to the outside of the body 1 via a fan shroud 41. The blower 4 is fixedly installed on the body 1, and its air outlet is connected to the front end (air inlet) of the combustion chamber 51 via the fan shroud 41. The fan shroud 41 is preferably a tapering duct, used to uniformly and smoothly introduce the high-pressure air generated by the blower into the front end of the combustion chamber 51. The blower 4 provides the combustion-supporting air required for combustion, and its air volume and pressure are selected according to the power requirements of the burner. The type of blower 4 is preferably a high-pressure centrifugal blower.

[0031] Specifically, a door cover for ash cleaning is provided at the lower end of the body 1 near the ash collection bin 6. The ash collection bin 6 is located directly below the combustion assembly 5 (especially the lower mesh area of ​​the combustion cylinder 51) and is used to collect ash falling from the mesh structure and the side notches 511, as well as ash scraped off by the ash removal section 7. The ash collection bin 6 is usually a drawer-type structure for easy periodic cleaning. A door cover 11 for ash cleaning is provided at the lower end of the body 1 near the ash collection bin 6 (see...). Figure 1 (Illustrated location). The cover 11 is preferably an openable drawer panel or a hinged door, facilitating the removal of the ash collection bin 6 or direct cleaning of the ash residue inside the ash collection bin 6. The cover 11 should be designed with a good sealing structure to prevent dust from escaping.

[0032] The working principle of this utility model:

[0033] Biomass pellet fuel falls from the hopper 3 through the discharge pipe 31 controlled by valve 32 into the combustion chamber 51, landing on the inclined plate 52. Under the influence of gravity, the fuel slides downwards and backwards along the inclined plate 52, accumulating at the bottom of the combustion chamber 51 (the area with the perforated mesh structure) behind the lower end of the inclined plate 52. The igniter 53 ignites the fuel, and the blower 4 supplies combustion air. The fuel burns fully inside the combustion chamber 51, producing a high-temperature flame that is ejected from the rear end. The fine ash produced by combustion falls into the ash collection bin 6 through the perforated mesh structure. After a period of operation, ash or coking may accumulate on the mesh, affecting ventilation and ash collection. At this time, by operating the ash removal unit 7 (pulling the crossbar 71), the arc-shaped scraper 73 moves longitudinally along the combustion chamber, scraping up the accumulated ash and pushing it to the notch 511 or directly scraping it through the perforated mesh into the ash collection bin 6, completing the ash removal operation. When the ash collection bin 6 is full, the lower cover 11 of the machine body can be opened for cleaning.

[0034] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A biomass pellet burner with slag removal function, comprising a body (1) and a cover (2) located on the body (1), characterized in that: It also includes a hopper (3), a blower (4), a combustion assembly (5), an ash collection bin (6), and a slag removal section (7); the hopper (3) is located on the upper part of the machine body (1); the combustion assembly (5) is connected to the lower part of the hopper (3); the blower (4) is fixed to one end of the combustion assembly (5), and the other end extends out of the outside of the machine body (1); the ash collection bin (6) is provided below the combustion assembly (5); the slag removal section (7) is provided on the combustion assembly (5); the slag removal section (7) can slide relative to the combustion assembly (5).

2. The biomass pellet burner with slag removal function according to claim 1, characterized in that: The lower end of the hopper (3) is connected to the combustion assembly (5) through the discharge pipe (31); the discharge pipe (31) is equipped with a valve (32).

3. The biomass pellet burner with slag removal function according to claim 1, characterized in that: The combustion assembly (5) includes a combustion cylinder (51), an incline plate (52), and an igniter (53); the incline plate (52) is inclinedly disposed in the combustion cylinder (51) below the material drop of the hopper (3); the igniter (53) is fixed on the lower surface of the incline plate (52).

4. The biomass pellet burner with slag removal function according to claim 3, characterized in that: The combustion cylinder (51) has two notches (511) at the lower left and right ends; the lower part of the combustion cylinder (51) between the two notches (511) has a mesh-like structure; a rectangular groove (512) for the slag removal section (7) to move is opened above the mesh-like structure of the combustion cylinder (51).

5. The biomass pellet burner with slag removal function according to claim 4, characterized in that: The slag removal section (7) includes a horizontal bar (71), a vertical bar (72), and an arc-shaped scraper (73); the horizontal bar (71) passes through two rectangular slots (512) symmetrically arranged in the combustion cylinder (51); the middle part of the horizontal bar (71) is fixedly connected to the vertical bar (72); the lower end of the vertical bar (72) is fixedly connected to the middle part of the arc-shaped scraper (73); the arc-shaped scraper (73) is in contact with the mesh structure at the bottom of the combustion cylinder (51).

6. The biomass pellet burner with slag removal function according to claim 1, characterized in that: The fan (4) is connected to the outside of the body (1) through the fan cover (41).

7. The biomass pellet burner with slag removal function according to any one of claims 1 to 6, characterized in that: The lower end of the machine body (1) near the ash collection bin (6) is provided with a door cover for ash cleaning.

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