Wood pellet burning equipment

Abstract

Adjust the heat generated by burning wood pellets. [Solution] In a wood pellet combustion device 10, wood pellets 34 in a combustion tube 30 are burned from above. Additionally, primary combustion air 50 from a primary supply passage 38 is supplied to the wood pellets 34 from below, and secondary combustion air 52 from a secondary supply passage 40 is supplied to the above of the wood pellets 34. Here, an adjustment mechanism 18 adjusts the amount of primary combustion air 50 from the primary supply passage 38 and secondary combustion air 52 from the secondary supply passage 40. This makes it possible to adjust the heat generated by the combustion of the wood pellets 34.

Description

[Technical field]

[0001] The present invention relates to a wood pellet combustion device in which wood pellets contained in a container are burned from above. [Background technology]

[0002] In the pellet stove described in Patent Document 1 below, wood pellets are supplied from above to a combustion furnace and burned. Furthermore, air is supplied to the wood pellets from below and above the wood pellets.

[0003] Here, it is preferable that such a pellet stove be capable of adjusting the heat generated by burning wood pellets. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-141609 A Summary of the Invention [Problem to be solved by the invention]

[0005] SUMMARY OF THE PRESENT DISCLOSURE In consideration of the above, an object of the present invention is to provide a wood pellet combustion device capable of adjusting the heat generated by burning wood pellets. [Means for solving the problem]

[0006] A first aspect of the wood pellet combustion device of the present invention comprises a container in which wood pellets are stored and burned from above, a primary supply passage through which primary combustion air is supplied to the wood pellets from below, a secondary supply passage through which secondary combustion air is supplied to the above of the wood pellets, and an adjustment mechanism for adjusting the amount of at least one of the primary combustion air and the secondary combustion air.

[0007] A second aspect of the wood pellet burning device of the present invention is the wood pellet burning device of the first aspect of the present invention, further comprising an adjustment member that is provided in the adjustment mechanism and moved to adjust the amount of opening of the primary supply path and the amount of opening of the secondary supply path.

[0008] A third aspect of the wood pellet burning device of the present invention is a wood pellet burning device of the second aspect of the present invention, in which the adjustment member is moved in one direction to increase the amount of opening of the primary supply path and decrease the amount of opening of the secondary supply path, and the adjustment member is moved in the other direction to decrease the amount of opening of the primary supply path and increase the amount of opening of the secondary supply path. Effect of the Invention

[0009] In the wood pellet combustion device of the first aspect of the present invention, wood pellets are stored in a storage body and burned from above. Furthermore, primary combustion air is supplied to the wood pellets from below through a primary supply passage, and secondary combustion air is supplied to the upper side of the wood pellets through a secondary supply passage.

[0010] Here, the adjustment mechanism adjusts the amount of at least one of the primary combustion air and the secondary combustion air, thereby making it possible to adjust the heat generated by the combustion of the wood pellets.

[0011] In the wood pellet combustion device of the second aspect of the present invention, the adjustment member of the adjustment mechanism is moved to adjust the opening amount of the primary supply passage and the opening amount of the secondary supply passage, so that the amount of primary combustion air and the amount of secondary combustion air can be easily adjusted.

[0012] In the wood pellet combustion device of the third aspect of the present invention, the adjustment member is moved in one direction to reduce the opening amount of the primary supply passage, and the adjustment member is moved in the other direction to reduce the opening amount of the secondary supply passage, which makes it easier to adjust the amount of primary combustion air and secondary combustion air. [Brief description of the drawings]

[0013] [Figure 1]1A is an oblique view from above showing the low-fire state of a wood pellet burning device according to an embodiment of the present invention, and FIG. 1B is an oblique view from above showing the adjustment mechanism of the wood pellet burning device in the low-fire state. [Diagram 2] 1A is an oblique view from above showing the medium heat state of a wood pellet burning device according to an embodiment of the present invention, and FIG. 1B is an oblique view from above showing the adjustment mechanism of the wood pellet burning device in the medium heat state. [Diagram 3] 1A is an oblique view from above showing the high heat state of a wood pellet burning device according to an embodiment of the present invention, and FIG. 1B is an oblique view from above showing the adjustment mechanism of the wood pellet burning device in the high heat state. [Figure 4] 1 is a cutaway perspective view showing a main part of a wood pellet combustion device according to an embodiment of the present invention, seen from above. FIG. [Diagram 5] FIG. 2 is a cross-sectional side view showing the combustion state of a wood pellet combustion apparatus according to an embodiment of the present invention. [Figure 6] 1A is a top view of a fixing plate of a wood pellet burning device according to an embodiment of the present invention, and FIG. 1B is a top view of a damper of the wood pellet burning device. [Figure 7] 4 is a graph showing the relationship between the position of the damper (horizontal axis) and the opening degree of the primary air hole and the secondary air hole (vertical axis) in a wood pellet combustion apparatus according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Fig. 1(A) shows a perspective view of a wood pellet combustion device 10 according to an embodiment of the present invention as seen from above, and Fig. 4 shows a cutaway perspective view of the main parts of the wood pellet combustion device 10 as seen from above. In the drawings, the upward direction of the wood pellet combustion device 10 is indicated by an arrow UP.

[0015] 1(A) and 4, a main body 12 is provided at the lower portion of the wood pellet combustion device 10 according to this embodiment. A disk-shaped bottom plate 14 is provided at the lower end of the main body 12, and the wood pellet combustion device 10 is placed on the bottom plate 14 at an installation position.

[0016] A substantially cylindrical outer tube 16 serving as an outer member is coaxially provided above the bottom plate 14, and a substantially disk-shaped fixed plate 20 (see FIG. 6(A)) serving as a fixed member constituting the adjustment mechanism 18 is coaxially fixed near the lower end of the outer tube 16. The fixed plate 20 is installed above the bottom plate 14 at a distance, and the outer tube 16 is spaced upward from the bottom plate 14, with an inlet 16A formed between the outer tube 16 and the bottom plate 14.

[0017] A plurality of pilot holes 20A are formed through the outer periphery of the fixed plate 20, and the plurality of pilot holes 20A are arranged at equal intervals in the circumferential direction of the fixed plate 20. The pilot holes 20A extend in the circumferential direction of the fixed plate 20, and the pilot holes 20A are open to the radially outer side of the fixed plate 20.

[0018] A plurality of primary fixing holes 20B are formed through the fixing plate 20 radially inward of the pilot holes 20A, and the plurality of primary fixing holes 20B are arranged at equal intervals in the circumferential direction of the fixing plate 20 and extend in the circumferential direction of the fixing plate 20. A plurality of secondary fixing holes 20C (the same number as the primary fixing holes 20B) are formed through the fixing plate 20 at radial intermediate positions between the pilot holes 20A and the primary fixing holes 20B, and the plurality of secondary fixing holes 20C are arranged at equal intervals in the circumferential direction of the fixing plate 20. The secondary fixing holes 20C extend in the circumferential direction of the fixing plate 20, and the width dimension of the secondary fixing holes 20C is smaller than the width dimension of the primary fixing holes 20B. The arrangement angle of the secondary fixing hole 20C in the circumferential direction of the fixing plate 20 is the same as the arrangement angle of the primary fixing hole 20B in the circumferential direction of the fixing plate 20, and the secondary fixing hole 20C is arranged in a range in the circumferential direction of the fixing plate 20 from the central position of one of a pair of adjacent primary fixing holes 20B to one end of the other.

[0019] A substantially annular plate-shaped damper 22 (see FIG. 6(B)) serving as an adjustment member constituting the adjustment mechanism 18 is coaxially supported below the fixed plate 20, and the damper 22 is rotatable about its central axis, with its outer periphery disposed radially inward from the pilot hole 20A of the fixed plate 20. A rectangular plate-shaped operating part 22A is integrally provided on the damper 22, and the operating part 22A protrudes radially outward from the damper 22. The operating part 22A is rotatably inserted through the outer tube 16 within a predetermined range and protrudes outward from the outer tube 16, and the user of the wood pellet combustion device 10 rotates the operating part 22A in the left-right direction to rotate the damper 22.

[0020] A plurality of primary movement holes 22B (the same number as the primary fixing holes 20B) are formed through the damper 22 at the radial position of the primary fixing hole 20B of the fixing plate 20, and the plurality of primary movement holes 22B are arranged at equal intervals in the circumferential direction of the damper 22. The primary movement holes 22B extend in the circumferential direction of the damper 22, and the width dimension of the primary movement holes 22B is the same as the width dimension of the primary fixing hole 20B, and the longitudinal dimension is 1 / 2 of the longitudinal dimension of the primary fixing hole 20B. A plurality of secondary movement holes 22C (the same number as the secondary fixing holes 20C) are formed through the damper 22 at the radial position of the secondary fixing hole 20C of the fixing plate 20, and the plurality of secondary movement holes 22C are arranged at equal intervals in the circumferential direction of the damper 22. The secondary movement hole 22C extends in the circumferential direction of the damper 22, and the width dimension of the secondary movement hole 22C is the same as the width dimension of the secondary fixing hole 20C, and the longitudinal dimension is 1 / 2 the longitudinal dimension of the secondary fixing hole 20C. The arrangement angle of the secondary movement hole 22C in the circumferential direction of the damper 22 is the same as the arrangement angle of the primary movement hole 22B in the circumferential direction of the damper 22, and the secondary movement hole 22C is arranged in the same range in the circumferential direction of the damper 22 as the primary movement hole 22B.

[0021] The primary fixing hole 20B of the fixed plate 20 and the primary movement hole 22B of the damper 22 are overlapped, and the overlapping portion between the primary fixing hole 20B and the primary movement hole 22B is made into a primary air hole 24 (see FIG. 1(B)). The secondary fixing hole 20C of the fixed plate 20 and the secondary movement hole 22C of the damper 22 are overlapped, and the overlapping portion between the secondary fixing hole 20C and the secondary movement hole 22C is made into a secondary air hole 26.

[0022] When the operating part 22A of the damper 22 is rotated to the left end position (left end position of the rotation range), the primary air hole 24 is minimized and the secondary air hole 26 is maximized (the size of the secondary moving hole 22C) (see Fig. 1 (B) and Fig. 7). When the operating part 22A of the damper 22 is rotated from the left end position to the center position (center position of the rotation range), the primary air hole 24 is gradually enlarged and the secondary air hole 26 is maintained at the maximum (see Fig. 7). When the operating part 22A of the damper 22 is rotated to the center position, the primary air hole 24 is maximized (the size of the primary moving hole 22B) and the secondary air hole 26 is maximized (see Fig. 2 (B) and Fig. 7). When the operating part 22A of the damper 22 is rotated from the center position to the right end position (right end position of the rotation range), the primary air hole 24 is maintained at the maximum and the secondary air hole 26 is gradually reduced in size (see Fig. 7). When the operating portion 22A of the damper 22 is rotated to the rightmost position, the primary air holes 24 are maximized and the secondary air holes 26 are minimized (see Figs. 3(B) and 7).

[0023] A cylindrical air tunnel 28 (see Figure 1 (B)) is coaxially arranged within the outer tube 16 as an internal member, and the air tunnel 28 is positioned radially midway between the pilot hole 20A and the secondary fixing hole 20C of the fixing plate 20, and is fixed to the upper side of the fixing plate 20.

[0024] A cylindrical combustion cylinder 30 constituting the container is provided coaxially in the air tunnel 28, and the combustion cylinder 30 is disposed in the radial middle between the primary fixing hole 20B and the secondary fixing hole 20C of the fixing plate 20, and is fixed to the upper side of the fixing plate 20. A plurality of substantially rectangular secondary supply holes 30A are formed through the upper end of the combustion cylinder 30, and the plurality of secondary supply holes 30A are disposed at equal intervals in the circumferential direction of the combustion cylinder 30 and are open to the upper side. A substantially disc-shaped grate 32 constituting the container is fixed coaxially near the lower end of the combustion cylinder 30, and a plurality of primary supply holes 32A are formed through the grate 32.

[0025] Above the grate 32 in the combustion tube 30, processed fuel such as cylindrical wood pellets 34 is accommodated and filled up to the bottom of the secondary supply hole 30A. The wood pellets 34 are biomass fuel, and are produced by crushing and compressing thinned wood. The wood pellets 34 are larger than the primary supply hole 32A of the grate 32, which prevents the wood pellets 34 from falling out of the primary supply hole 32A.

[0026] A substantially annular ring 36 serving as an upper member is coaxially fitted near the upper end of the outer cylinder 16, and the ring 36 has an inner diameter equal to that of the combustion cylinder 30 and is placed above the combustion cylinder 30 and the air tunnel 28. A plurality of upper holes 36A are formed through the outer periphery of the ring 36, radially outside the air tunnel 28, and the plurality of upper holes 36A are disposed at equal intervals in the circumferential direction of the ring 36. The upper holes 36A extend in the circumferential direction of the ring 36, and the upper holes 36A are open to the radially outer side of the ring 36.

[0027] A primary supply path 38 extends from the inlet 16A between the bottom plate 14 and the outer tube 16 through the fixed plate 20 and damper 22 in the outer tube 16, the primary air hole 24, and the lower side of the grate 32 in the combustion tube 30 to the primary supply hole 32A of the grate 32. A secondary supply path 40 extends from the inlet 16A to the fixed plate 20 and damper 22 in the outer tube 16, the secondary air hole 26, and between the wind tunnel 28 and the combustion tube 30 to the secondary supply hole 30A of the combustion tube 30. An external supply path 42 extends from the inlet 16A to the fixed plate 20 and damper 22 in the outer tube 16, the lower hole 20A of the fixed plate 20, and between the outer tube 16 and the wind tunnel 28 to the upper hole 36A of the ring 36.

[0028] A transparent cylindrical glass cylinder 44 is coaxially attached to the upper side of the outer cylinder 16, and the inside of the glass cylinder 44 is connected to the inside of the outer cylinder 16. A disk-shaped top plate 46 is coaxially installed on the upper side of the glass cylinder 44, and the top plate 46 is separated from the glass cylinder 44 to form a gap between the top plate 46 and the glass cylinder 44. A cylindrical far-infrared radiator 48 is coaxially installed below the top plate 46, and the far-infrared radiator 48 is inserted into the glass cylinder 44.

[0029] Next, the operation of this embodiment will be described.

[0030] When the wood pellet combustion device 10 configured as described above is used, the glass cylinder 44 (including the top plate 46 and the far-infrared radiator 48) is removed from the outer cylinder 16 of the main body 12, and then the wood pellets 34 are loaded from above the grate 32 in the combustion cylinder 30. An ignition agent is then poured onto the wood pellets 34 from above, and the wood pellets 34 are ignited from above, causing the wood pellets 34 to burn from above. After that, the glass cylinder 44 (including the top plate 46 and the far-infrared radiator 48) is attached to the outer cylinder 16.

[0031] When the wood pellets 34 burn, an ascending air current is generated in the glass cylinder 44. For this reason, as shown in Figures 4 and 5, air outside the main body 12 is supplied as primary combustion air 50 to the wood pellets 34 from below through the primary supply passage 38 of the main body 12 (from the inlet 16A between the bottom plate 14 and the outer cylinder 16, below the fixed plate 20 and damper 22 in the outer cylinder 16, through the primary air hole 24 and below the grate 32 in the combustion cylinder 30, to the primary supply hole 32A of the grate 32). Furthermore, air outside the main body 12 is supplied as secondary combustion air 52 to the upper side of the wood pellets 34 through the secondary supply passage 40 of the main body 12 (from the inlet 16A to the lower side of the fixed plate 20 and damper 22 in the outer cylinder 16, through the secondary air hole 26 and between the wind tunnel 28 and the combustion cylinder 30, to the secondary supply hole 30A of the combustion cylinder 30). Moreover, air outside the main body 12 is supplied to the inner surface of the glass tube 44 through the external supply passage 42 of the main body 12 (from the inlet 16A to the lower side of the fixed plate 20 and damper 22 in the outer tube 16, through the lower hole 20A of the fixed plate 20 and between the outer tube 16 and the air tunnel 28, and to the upper hole 36A of the ring 36) as passing air 54.

[0032] As a result, the primary combustion air 50 from the primary supply passage 38 causes the wood pellets 34 to undergo primary combustion (gasification) from above, generating combustible gas 34A and turning into combustion ash 34B. The wood pellets 34 undergo primary combustion from above to below, turning into combustion ash 34B. Furthermore, the secondary combustion air 52 from the secondary supply passage 40 causes the combustible gas 34A to combust above the wood pellets 34 (the wood pellets 34 undergo secondary combustion). The passing air 54 also passes through the external supply passage 42 to cool the outer cylinder 16, and the passing air 54 is supplied to the inner circumferential surface of the glass cylinder 44, suppressing contamination of the inner circumferential surface of the glass cylinder 44.

[0033] When the wood pellets 34 burn, the flames from the burning wood pellets 34 illuminate the surroundings of the glass cylinder 44. Furthermore, the far-infrared radiator 48 is heated and radiates far-infrared rays to the outside of the glass cylinder 44, thereby heating the surroundings of the glass cylinder 44. Moreover, the top plate 46 is heated, so that cooking can be done on the top plate 46, for example.

[0034] Incidentally, when the primary combustion air 50 from the primary supply passage 38 and the secondary combustion air 52 from the secondary supply passage 40 are large, the wood pellets 34 generate a sufficient amount of combustible gas 34A, and the combustible gas 34A is sufficiently burned, so that the heat generated by the combustion of the wood pellets 34 is medium heat (standard heat). When the primary combustion air 50 from the primary supply passage 38 is decreased, the combustible gas 34A generated by the wood pellets 34 is also decreased, and the heat generated by the combustion of the wood pellets 34 is reduced. On the other hand, when the secondary combustion air 52 from the secondary supply passage 40 is decreased, the time required for the combustion of the combustible gas 34A becomes longer, and the flame generated by the combustion of the combustible gas 34A becomes higher, so that the upward air current in the glass cylinder 44 becomes stronger, the primary combustion air 50 from the primary supply passage 38 increases, and the heat generated by the combustion of the wood pellets 34 increases.

[0035] Here, in the adjustment mechanism 18, the operating part 22A of the damper 22 is rotated from the central position to the left, and the primary air hole 24 formed by the damper 22 (primary moving hole 22B) and the fixed plate 20 (primary fixing hole 20B) is made smaller, so that the primary combustion air 50 from the primary supply path 38 is reduced, and the firepower caused by the combustion of the wood pellets 34 is reduced (see (A) and (B) of FIG. 1, (A) and (B) of FIG. 2, and FIG. 7). On the other hand, the operating part 22A of the damper 22 is rotated from the central position to the right, and the secondary air hole 26 formed by the damper 22 (secondary moving hole 22C) and the fixed plate 20 (secondary fixing hole 20C) is made smaller, so that the secondary combustion air 52 from the secondary supply path 40 is reduced, and the firepower caused by the combustion of the wood pellets 34 is increased (see (A) and (B) of FIG. 2, (A) and (B) of FIG. 3, and FIG. 7). Therefore, the firepower caused by the combustion of the wood pellets 34 can be adjusted. This makes it possible to adjust the temperature when using the wood pellet burning device 10, particularly when using heat for heating with the far-infrared radiator 48 and cooking on the top plate 46, thereby improving the ease of use of the wood pellet burning device 10 and reducing unnecessary energy consumption.

[0036] Furthermore, the damper 22 is rotated to adjust the amount of opening of the primary supply passage 38 (the size of the primary air holes 24) and the amount of opening of the secondary supply passage 40 (the size of the secondary air holes 26). Therefore, the amount of primary combustion air 50 from the primary supply passage 38 and the amount of secondary combustion air 52 from the secondary supply passage 40 can be easily adjusted.

[0037] Furthermore, the damper 22 (operation part 22A) is rotated leftward (one direction) from the central position to reduce the opening amount of the primary supply passage 38 (primary air holes 24), and the damper 22 (operation part 22A) is rotated rightward (the other direction) from the central position to reduce the opening amount of the secondary supply passage 40 (secondary air holes 26). This makes it easy to adjust the amount of primary combustion air 50 from the primary supply passage 38 and the amount of secondary combustion air 52 from the secondary supply passage 40.

[0038] In this embodiment, the operation portion 22A of the damper 22 is rotated to the left from the central position to maintain the size of the secondary air hole 26. However, the operation portion 22A of the damper 22 may be rotated to the left from the central position to make the secondary air hole 26 larger or smaller.

[0039] Furthermore, in this embodiment, the operating portion 22A of the damper 22 is rotated to the right from the central position to maintain the size of the primary air hole 24. However, the operating portion 22A of the damper 22 may be rotated to the right from the central position to make the primary air hole 24 larger or smaller.

[0040] Furthermore, in this embodiment, the adjustment mechanism 18 adjusts the opening amount of the primary supply path 38 and the opening amount of the secondary supply path 40. However, it is sufficient for the adjustment mechanism 18 to adjust at least one of the opening amount of the primary supply path 38 and the opening amount of the secondary supply path 40.

[0041] Furthermore, the wood pellet combustion device of the present invention may be used for purposes other than those described in this embodiment (such as a boiler). [Explanation of symbols]

[0042] 10 Wood pellet burning device 18 Adjustment mechanism 22 Damper (adjustment member) 30 Combustion tube (container) 32 Rostrum (container) 34 Wood pellets 38 Primary supply route 40 Secondary supply route 50 Primary combustion air 52 Secondary combustion air

Claims

1. A container in which wood pellets are contained and the wood pellets are burned from above; A primary supply passage through which primary combustion air is supplied to the wood pellets from below; A secondary supply passage through which secondary combustion air is supplied above the wood pellets; an adjustment mechanism that is provided with a single adjustment member that is moved to adjust an opening amount of the primary supply passage and an opening amount of the secondary supply passage, and that changes the amount of the other of the primary combustion air and the secondary combustion air while maintaining the amount of one of the primary combustion air and the secondary combustion air by moving the adjustment member; A wood pellet burning device comprising:

2. A wood pellet burning device as described in claim 1, wherein the adjustment member is moved in one direction to reduce the amount of opening of the primary supply path, and the adjustment member is moved in the other direction to reduce the amount of opening of the secondary supply path.

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