JP5366433B2 - Wood pellet combustion equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve heat efficiency with respect to a woody pellet combustion device for firing woody pellet prepared by crushing and compressing thinned wood. <P>SOLUTION: In this pellet stove 10, a straightening member 100 having the U-shape in a plane view, is disposed at an upper part of a grate (combustion shelf) 32. The straightening member 100 is composed of an inner peripheral wall 102 and an outer peripheral wall 104, and an air guide passage 106 is formed over the whole periphery. A straightening section 114 having the corrugated shape on its vertical section, is formed on an intermediate section in the height direction, of the inner peripheral wall 102, and a secondary air hole 116 is formed only on an upper wall 114A. Thus the secondary air is jetted toward the oblique upper part to the flame. Thus the flame can easily raises right above in comparison with a case when the secondary air vertically hits right in the side of the flame, and heat of the flame can be efficiently transferred to an upper section of a combustion chamber 30. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a wood pellet combustion apparatus for burning wood pellets made by pulverizing and compressing thinned wood.

In a conventional wood pellet combustion apparatus (see, for example, Patent Document 1), a combustion shelf is provided in the lower part of the combustion chamber, and wood pellets are supplied to the upper surface of the combustion shelf. A plurality of air holes are formed in the combustion shelf, and primary air is supplied to the wood pellets on the combustion shelf through the air holes, and the wood pellets are burned. Further, a plurality of secondary air holes are formed in the side wall of the combustion chamber, and the secondary air is supplied into the combustion chamber through these secondary air holes. As a result, unburned components that could not be burned in the primary combustion are mixed with the secondary air and reburned.
JP 2007-132634 A

  By the way, in the wood pellet combustion apparatus as described above, the fuel efficiency may decrease for the following reasons.

  That is, in the wood pellet combustion apparatus, the rectifying member formed in a U shape in plan view is disposed above the combustion shelf so as to face the secondary air hole of the side wall, and is surrounded by the rectifying member and the side wall. The mixing of the secondary air and the unburned components is promoted by satisfactorily stirring the flame (during the burning of wood pellets) and the secondary air. However, since the secondary air is supplied vertically from the side to the flame, there is a possibility that the flame rises directly above depending on the ejection speed of the secondary air. In that case, the heat of the flame cannot be satisfactorily transmitted to the upper part of the combustion chamber, and a region having a low heat exchange property is formed in the upper part of the combustion chamber. As a result, the thermal efficiency decreases.

  An object of the present invention is to obtain a wood pellet combustion apparatus capable of improving the thermal efficiency in consideration of the above facts.

The wood pellet combustion apparatus according to the first aspect of the present invention is a combustion shelf that is disposed in the lower part of the combustion chamber separated by the side wall and has air permeability, and burns the wood pellets supplied to the upper surface, The first air supply means for supplying the primary air for burning the wood pellets by pressure or suction to the lower side of the combustion shelf, and the second air supply passage provided outside the combustion chamber are connected to the second air supply passage for the wood pellets. A second air supply means for supplying secondary air; and a secondary frame disposed above the combustion shelf and formed in a substantially frame shape or a substantially ring shape so as to surround a flame generated during combustion of wood pellets, and the secondary An inclined portion having an air guide path communicated with an air supply path and having a corrugated shape in the longitudinal cross-sectional shape of the inner peripheral wall on the side facing the flame has an inclined portion directed toward the rising direction of the flame. It is formed, obliquely upward with respect to the flame to the inclined portion Only to have a rectification member having a plurality of secondary air injection hole is formed for ejecting a secondary air, comprising the.

  In the wood pellet combustion apparatus according to the first aspect, the primary air is supplied by pressure or suction to the lower side of the combustion shelf by the first air supply means. Since the combustion shelf has air permeability, the primary air supplied to the lower side is supplied to the upper side through the combustion shelf. Thereby, the wood pellet supplied to the upper surface of the combustion shelf burns. Further, a secondary air supply path is formed outside the combustion chamber, and the secondary air is supplied to the secondary air supply path by the second air supply means.

  Here, a rectifying member formed in a substantially frame shape or a substantially ring shape is disposed above the combustion shelf so as to surround the flame generated when the wood pellets are burned, and communicated with the secondary air supply path. Since the air guide path is provided, secondary air is sent from the secondary air supply path into the air guide path. The secondary air guided to the air guide path is ejected obliquely upward with respect to the flame from a plurality of secondary air ejection holes formed in the inner peripheral wall of the rectifying member. Thereby, secondary air is satisfactorily supplied to the flame rising on the combustion shelf, and secondary combustion of the unburned components of the wood pellets is promoted.

Particularly in the present invention, the secondary air ejection hole formed in the inner peripheral wall of the rectifying member is configured to eject the secondary air obliquely upward with respect to the flame. Compared to the case where the flame is ejected vertically, the flame does not hinder the rise, and rather helps the flame rise upward. Thereby, since it becomes possible to convey the heat of a flame favorably to the upper part of a combustion chamber, it can control that the field where a heat exchange rate is bad in the upper part of a combustion chamber is made. As a result, thermal efficiency can be improved. In addition, the inner wall of the rectifying member is formed with a corrugated longitudinal cross-sectional shape, so that an inclined portion is formed with the surface facing the rising direction of the flame. Since it is set as the formed structure, the inner peripheral wall of a rectification | straightening member can be manufactured by press molding. Therefore, it is easy to manufacture and to ensure accuracy. Furthermore, since the direction of the secondary air ejection with respect to the flame changes by changing the inclination angle of the inclined portion, an optimum inclination angle is selected according to the size of the device and the like, and an inclined portion having the inclination angle is provided. The inner peripheral wall can be easily manufactured.

  A wood pellet combustion apparatus according to a second aspect of the present invention is the wood pellet combustion apparatus according to the first aspect, wherein the plurality of secondary air ejection holes are formed on substantially the entire circumference of the inner peripheral wall of the rectifying member. It is characterized by that.

  In the wood pellet combustion apparatus according to the second aspect, since the secondary air ejection holes are formed in substantially the entire circumference of the inner peripheral wall of the rectifying member, the secondary air is ejected substantially evenly from the periphery of the flame. For this reason, the flame rises substantially straight, and the heat of the flame can be efficiently transmitted to the upper part of the combustion chamber.

  A wood pellet combustion apparatus according to a third aspect of the present invention is the wood pellet combustion apparatus according to the first or second aspect, wherein the rectifying member is disposed outside the inner peripheral wall and the inner peripheral wall. The outer peripheral wall that forms the air guide path with the inner peripheral wall constitutes all or a main part thereof.

  In the wood pellet combustion apparatus according to claim 3, the rectifying member is formed by an inner peripheral wall in which a plurality of secondary air ejection holes are formed and an outer peripheral wall that is disposed outside thereof and forms an air guide path with the inner peripheral wall. Since all or the main part is constituted, the rectifying member can be manufactured with a small number of parts. Therefore, the manufacturing cost can be reduced as compared with the case where all or the main part of the rectifying member is formed by combining three or more members.

  As described above, the wood pellet combustion apparatus according to the present invention has an excellent effect that thermal efficiency can be improved.

  The structure of the pellet stove 10 as a wood pellet combustion apparatus concerning embodiment of this invention is shown by FIG. 1 with the longitudinal cross-sectional view seen from the front side. 2 is a cross-sectional view taken along line 2-2 of FIG. 1, and FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. Hereinafter, the overall configuration of the pellet stove 10 will be described with reference to these drawings.

  The pellet stove 10 includes a can body 12. The can body 12 is formed in a hollow rectangular parallelepiped shape having a bottom wall 12A and an upper wall 12B, and a front wall 12C, a back wall 12D, a right side wall 12E, and a left side wall 12F as side walls, and the inside is combusted. It is a chamber 30. The combustion chamber 30 is formed in a deformed shape (in the present embodiment, a rectangle) having a major axis and a minor axis when viewed from above, and the right side wall is larger than the distance dimension between the front wall 12C and the rear wall 12D. The distance dimension between 12E and the left side wall 12F is set larger. In addition, heat resistant paint is applied to the wall surfaces of the bottom wall 12A, the top wall 12B, the front wall 12C, the back wall 12D, the right side wall 12E, and the left side wall 12F, respectively.

  A casing 15 is disposed on one side of the can 12 in the long axis direction (the right side wall 12E side). The casing 15 is formed in a hollow rectangular parallelepiped shape like the can body 12. A hopper 16 serving as a fuel tank is disposed inside the housing 15. Inside the hopper 16 is a wood pellet 14 which is a processed fuel made by pulverizing and compressing thinned wood (in this embodiment, for example, it is processed into a cylindrical shape and has a diameter of about 4 mm to 5 mm). The length is about 5 mm to 6 mm).

  A fuel transfer device 18 is provided below the hopper 16. The fuel transfer device 18 includes an upper screw 20 and a lower screw 22 that are arranged in two steps, upper and lower. The upper screw 20 is driven and rotated by a motor 24, and the lower screw 22 is driven and rotated by a motor 25. These motors 24 and 25 are connected to the control circuit 38 via wiring (not shown) disposed in the pellet stove 10.

  A fuel drop port 26 is formed at the lower end of the hopper 16. A base end side of the upper screw 20 whose axial direction is the horizontal direction is disposed below the fuel lowering port 26. Further, the base end side of the lower screw 22 is disposed below the upper end side of the upper screw 20. The distal end side of the upper screw 20 and the proximal end side of the lower screw 22 are communicated with each other by a chute 28. Moreover, the front-end | tip part of the lower screw 22 is connected to the fuel supply port 29 formed in the predetermined position (above the rooster 32 mentioned later) of the height direction of the right side wall 12E. Therefore, the wood pellets 14 put into the hopper 16 are scraped in the axial direction after being put into the upper screw 20 from the fuel dropping port 26, and are transported to the chute 28 and fall (see arrow A in FIG. 1). . The wood pellet 14 dropped from the chute 28 is pushed out to the combustion chamber 30 side by the lower screw 22 arranged in the lower stage of the fuel transfer device 18, and the combustion chamber 30 through the fuel supply port 29 formed in the right side wall 12E. It is conveyed to the inside.

  In the lower part of the combustion chamber 30, a rooster 32 is provided as a fuel shelf that is formed in a flat plate shape and constitutes the combustion section 31 on one side in the long axis direction of the combustion chamber 30 (on the right side wall 12 </ b> E side). The wood pellets 14 conveyed to the inside of the combustion chamber 30 are supplied to the upper surface of the rooster 32.

  Below the rooster 32, a box-shaped cover 33 having both upper and lower end portions and an end portion on the right side wall 12 </ b> E opened is provided, and an air intake chamber 44 is formed inside the cover 33. Inside the air intake chamber 44, a rod-shaped ignition heater 34 is provided. The ignition heater 34 is a so-called “ceramic heater”, and is fixed to the lower surface of the rooster 32 while being inclined at a predetermined angle with respect to the plate surface of the rooster 32 arranged horizontally. The tip of the ignition heater 34 is inserted through a through hole 36 formed in the rooster 32 and protrudes from the upper surface of the rooster 32 by a predetermined amount (for example, protrudes about 5 mm). For this reason, when the wood pellet 14 is supplied to the upper surface of the rooster 32, the tip of the ignition heater 34 is covered with the wood pellet 14. The ignition heater 34 is connected to a control circuit 38 via a wiring (not shown) disposed on the pellet stove 10.

  On the other hand, the rooster 32 is formed with a plurality of air injection holes 40 penetrating in the thickness direction, and the combustion chamber 30 and the air intake chamber 44 are communicated with each other through the air injection holes 40. Yes. The air intake chamber 44 communicates with the air passage 46 through a plurality of primary air holes 49 (see FIG. 3) formed in the right side wall 12E of the can body 12. The air passage 46 is formed between the can body 12 and the housing 15, and when the blower 42 disposed in the lower portion of the housing 15 is activated, air is supplied to the air passage 46. ). A part of the air supplied into the air passage 46 is supplied into the air intake chamber 44 through the plurality of primary air holes 49 (see arrow B in FIG. 1), and the plurality of air nozzle holes 40. To the inside of the combustion chamber 30 (the upper surface side of the rooster 32). Thereby, the primary air for combustion is supplied to the wood pellet 14 on the rooster 32. The blower 42 described above is connected to the control circuit 38 described above via a wiring (not shown) disposed on the pellet stove 10.

  The control circuit 38 is for centrally controlling the motors 24 and 25, the ignition heater 34, and the blower 42 of the fuel transfer device 18 described above. A power switch (not shown) connected to the control circuit 38 is turned on. ”, The motors 24 and 25 of the fuel transfer device 18 and the blower 42 are operated, and the ignition heater 34 is energized for a predetermined time (for example, about 1 to 2 minutes).

  When the ignition heater 34 generates heat by energization, the wood pellet 14 covering the tip of the ignition heater 34 is heated and ignited. At this time, as described above, the primary air (see arrow B in FIG. 1) sent from the blower 42 to the air intake chamber 44 passes through the air nozzle hole 40 of the rooster 32 and is ventilated into the combustion chamber 30. The wood pellets 14 conveyed to the upper surface of the rooster 32 are burned. When the wood pellets 14 on the upper surface of the rooster 32 are burning, the wood pellets 14 in the hopper 16 are sequentially replenished onto the rooster 32 by the upper screw 20 and the lower screw 22 of the fuel transfer device 18 and burned. As a result, as shown in FIG. 3, the flame F rises above the rooster 32.

  The supply speed of the wood pellet 14 to the upper surface of the rooster 32 (that is, the rotational speed of the upper screw 20 and the lower screw 28) can be changed by operating a switch (not shown) connected to the control circuit 38. The size of the flame F can be adjusted in a plurality of stages between the maximum combustion and the minimum combustion.

  Here, as shown in FIGS. 1 to 3, a rectifying member 100 formed in a U shape in plan view is disposed above the rooster 32 described above. Specifically, as shown in FIGS. 4 and 5, the rectifying member 100 includes an inner peripheral wall 102 and an outer peripheral wall 104. The inner peripheral wall 102 is disposed so as to surround the lower part of the flame F (see FIG. 3), and is configured by press molding. Further, the outer peripheral wall 104 disposed outside the inner peripheral wall 102 has a vertical cross-sectional shape formed in a U shape by bending both ends in the vertical direction at right angles to the inner peripheral wall 102 side. Then, the inner peripheral end of the outer peripheral wall 104 is brought into contact with the outer surface of the inner peripheral wall 102 and is fixed by welding. Thus, a U-shaped air guide passage 106 is formed between the inner peripheral wall 102 and the outer peripheral wall 104 in a plan view. A pair of upper and lower mounting flanges 108 are formed by bending at both ends in the circumferential direction of the outer peripheral wall 104. A total of four mounting flanges 108 are formed with mounting holes 110 each having a long hole. Correspondingly, a bolt insertion hole (not shown) is formed at a position corresponding to the mounting hole 110 in the right side wall 12E with which the mounting flange 108 is in contact. The rectifying member 100 is attached to the right side wall 12E by inserting bolts through these bolt insertion holes and attachment holes 110 and tightening them with nuts (see FIG. 1).

  In a state where the rectifying member 100 is fixed to the right side wall 12E, both side portions 100A of the rectifying member 100 function as heat shield portions (heat shield plates) for the front wall 12C and the back wall 12D, and are in a position close to the flame F. ) The heat resistant paint applied to the front wall 12C and the back wall 12D is prevented from peeling off. In the case of the present embodiment, both side portions 100A of the rectifying member 100 are constituted by two plates of the inner peripheral wall 102 and the outer peripheral wall 104, and the air guide path 106 is interposed between the two plates. Heat insulation performance is higher than that of a heat shield made of a plate.

  A communication hole 112 (see FIGS. 1 to 3) is formed at a position overlapping the air guide path 106 in the right side wall 12E, and the air passage 46 and the air guide path 106 are communicated with each other by the communication hole 112. ing.

  Further, a rectifying portion 114 having a corrugated longitudinal cross-sectional shape is integrally formed at the height direction intermediate portion (position overlapping the air guide passage 106) of the inner peripheral wall 102 of the rectifying member 100 described above. The rectifying unit 114 includes an upper wall 114A as an inclined part whose surface is directed in the rising direction of the flame F (the arrow X direction in FIG. 3), and a lower wall 114B whose surface is directed in a direction opposite to the rising direction of the flame F. , And are alternately repeated. A plurality of secondary air holes 116 are formed only on the upper wall 114A side. Accordingly, the secondary air is jetted obliquely upward (in the direction of arrow Y in FIG. 5) from the secondary air hole 116 with respect to the flame F. Note that the secondary air hole 116 formed in the upper wall 114A of the upper stage and the secondary air hole 116 formed in the upper wall 114A of the lower stage are formed at the same position in the circumferential direction of the rectifying member 100. The secondary air holes 116 formed in the upper wall 114A formed in the middle stage are formed at positions shifted by 1/2 pitch.

  Note that the amount of primary air supplied from the air injection holes 40 (number and size of primary air holes 49) and the amount of secondary air supplied from the secondary air holes 116 (number and size of secondary air holes 116). Is set according to the maximum combustion.

  Returning to FIG. 1, a gap 43 is provided between the rectifying member 100 and the rooster 32 described above, and the burned residue (ash) of the wood pellet 14 burned on the rooster 32 is the upper screw 20 and the lower screw. 22 is pushed out by the wood pellet 14 newly supplied onto the rooster 32 and falls from the rooster 32 through the gap 43.

  The burnt residue (ash) of the wood pellets 14 dropped from above the rooster 32 is guided by the guide frame 60 attached to the inner wall of the combustion chamber 30 so as to fall into the ash tray 58 disposed below the rooster 32. It has become. Note that the wood pellet 14 does not become a powder form even if burned out, and becomes ash with a little left in its original form, so that only a small amount of ash falls from the air nozzle hole 40 of the rooster 32, but the air nozzle hole 40. The ash of the wood pellet 14 that has fallen into the air intake chamber 44 also falls into the ash receiving tray 58.

  Further, a baffle plate 64 formed of a plate material is provided inside the combustion chamber 30, and a cylindrical chimney 65 is formed by the baffle plate 64 and the left side wall 12 </ b> F of the can body 12. The chimney 65 extends vertically in the combustion chamber 30, and the lower end opening (combustion gas intake 65 </ b> A) is disposed below the rooster 32. That is, the combustion gas inlet 65A of the chimney 65 is disposed at the “lower” when the combustion chamber 30 is divided into three equal parts, ie, an upper part, an intermediate part, and a lower part.

  The inside of the chimney 65 is a gas passage 66, and the combustion gas generated in the combustion chamber 30 is taken into the gas passage 66 through the combustion gas inlet 65A. A plate-like perforated plate 68 having a plurality of through holes is provided in the gas passage 66, and ash contained in the combustion gas is removed by the perforated plate 64. Further, the gas passage 66 communicates with a cylindrical smoke cylinder 62 attached to the upper wall 12B of the can body 12, and the combustion gas is exhausted to the outside of the pellet stove 10 through the inside of the smoke cylinder 62. It is the composition which becomes.

  The combustion gas generated in the combustion chamber 30 tries to flow backward to the fuel transfer device 18 side through the fuel supply port 29 of the right side wall 12E, but the air return passage connected from the air passage 46 to the intermediate portion thereof. The backflow is prevented by the air that flows into 52 and is ejected from above the chute 28.

  Next, the operation of this embodiment will be described.

  In the pellet stove 10 having the above-described configuration, when a power switch (not shown) is turned “ON”, the motors 24 and 25 of the fuel transfer device 18 are operated, and the wood pellets 14 stored in the hopper 16 are connected to the upper screw 20 and The lower screw 22 conveys the upper surface of the rooster 32 disposed in the combustion chamber 30. For this reason, the tip of the ignition heater 34 protruding from the upper surface of the rooster 32 is covered with the wood pellet 14.

  At this time, the ignition heater 34 is also energized, and the ignition heater 34 generates heat. As a result, the wood pellet 14 covering the tip of the ignition heater 34 is heated and ignited by the ignition heater 34. Further, at this time, the air blower 42 is operated, so that the air (primary air) sent from the air blower 42 to the air intake chamber 44 passes through the air nozzle hole 40 of the rooster 32, and becomes the wood pellet 14 on the upper surface of the rooster 32. Supplied. Thereby, the wood pellet 14 on the upper surface of the rooster 32 ignited by the ignition heater 34 burns, and the flame F rises above the rooster 32.

  Further, the air supplied from the blower 42 and flowing into the air passage 46 rises in the air passage 46 (see arrow C in FIG. 1) and is rectified from the communication hole 112 formed in the right side wall 12E of the can body 12. The air is fed into the air guide path 106 of the member 100. Then, the air is fed into the combustion chamber 30 from the plurality of secondary air holes 116, and unburned components that could not be burned in the primary combustion are mixed with the secondary air and reburned. Since these secondary air holes 116 are formed so as to surround the lower side of the flame F, the lower side of the flame F has a secondary air hole at both the maximum combustion and the minimum combustion. Secondary air is intensively supplied.

  As described above, the high-temperature combustion gas generated in the combustion chamber 30 due to the combustion of the wood pellets 14 rises to the upper part of the combustion chamber 30, and then the combustion chamber 30 in which the combustion gas intake 65A of the chimney 65 is disposed. Is lowered toward the lower portion of the gas, and further rises in the chimney 65 (gas passage 66) and is exhausted to the outside of the apparatus (see arrow S in FIG. 1). Thereby, since the high-temperature combustion gas flows largely up and down in the combustion chamber 30 (the flow path of the combustion gas becomes longer), heat exchange can be performed evenly over the entire wall of the combustion chamber 30. Thermal efficiency can be improved.

  Here, in the pellet stove 10 according to the present embodiment, the rectifying member 100 formed in a substantially frame shape is disposed above the rooster 32 so as to surround the flame F generated when the wood pellets 14 are burned in the front, rear, left, and right, The air guide passage 106 and the air passage 46 of the rectifying member 100 are connected to each other through the communication hole 112, and secondary air sent into the air guide passage 106 is formed on the upper wall 114 </ b> A of the rectifying unit 114. Since the secondary air hole 116 is ejected obliquely upward, the secondary air can be supplied to the flame F surrounded by the rectifying member 100, and the flame F can be raised directly above. it can. Thereby, mixing of the secondary air and the unburned component is promoted, and recombustion of the unburned component can be further promoted more favorably, and the heat of the flame F is transferred to the upper portion of the combustion chamber 30 (FIGS. 1 and FIG. 1). 3) (region indicated by a symbol T) in FIG. As a result, thermal efficiency can be improved.

  In particular, the air guide path 106 and the air passage 46 of the rectifying member 100 are connected to each other through the communication hole 112, and the secondary air fed into the air guide path 106 is formed on the upper wall 114A of the rectifying unit 114. Since the secondary air hole 116 is ejected obliquely upward, the secondary air is not obstructed from rising upward as compared with the case where the secondary air is blown vertically from the side of the flame F. Rather, it helps the flame F to rise upwards. Thereby, it becomes possible to transmit the heat of the flame F well to the upper part of the combustion chamber 30, and it can suppress that the area | region where a heat exchange rate is bad in the upper part of the combustion chamber 30 is made. As a result, the thermal efficiency can be further improved.

  Further, in the pellet stove 10 according to the present embodiment, since the secondary air holes 116 are formed in substantially the entire circumference of the inner peripheral wall 102 of the rectifying member 100, the secondary air is ejected from the periphery of the flame F substantially evenly. The For this reason, the flame rises substantially straight, and the heat of the flame can be efficiently transmitted to the upper portion of the combustion chamber 30.

  Further, in the pellet stove 10 according to the present embodiment, the rectifying member 100 is an outer periphery that forms the air guide path 106 with the inner peripheral wall 102 in which the plurality of secondary air holes 116 are formed and the inner peripheral wall 102 that is disposed outside the inner peripheral wall 102. Since it is constituted by the wall 104, it can be manufactured with a small number of parts. Accordingly, the manufacturing cost can be reduced as compared with the case where all or the main portion of the air passage 46 is formed by combining three or more members.

Further, in the pellet stove 10 according to the present embodiment, the inner peripheral wall 102 of the rectifying member 100 is integrally formed with a rectifying unit 114 having a vertical cross-sectional shape formed into a corrugated shape, and the rectifying unit 114 has a corrugated shape. Since the plurality of secondary air holes 116 are formed in the upper wall 114A, the inner peripheral wall 102 of the rectifying member 100 can be manufactured by press molding. Specifically, a plurality of secondary air holes 116 are formed at the same time as the planar development shape of the inner peripheral wall 102 is punched by the first press punching, and the rectifying unit 114 is formed by the next press. As described above, according to this embodiment, the inner peripheral wall 102 and thus the rectifying member 100 can be easily manufactured and the accuracy can be easily secured.

  Furthermore, since the direction of secondary air ejection with respect to the flame F is changed by changing the inclination angle of the upper wall 114A, an optimum inclination angle is selected in accordance with the size of the device, and the inclination portion of the inclination angle is selected. The provided inner peripheral wall 102 can be easily manufactured.

  Moreover, in the pellet stove 10 which concerns on this embodiment, the effect listed below is also acquired.

  First, in the case of the above-described prior art, secondary air holes are formed in a wide range including the upper portion of the right side wall 12E. In this case, excess air that is not used for the secondary combustion of the wood pellets 14 is generated, There is a disadvantage that the thermal efficiency in the upper part of the combustion chamber 30 is lowered. In contrast, in the pellet stove 10 according to the present embodiment, the secondary air hole 116 is not formed in the right side wall 12E, and the secondary air hole 116 is formed only in a predetermined range of the inner member 102 of the rectifying member 100. Therefore, generation | occurrence | production of the excess air which does not contribute to secondary combustion can be suppressed. Therefore, thermal efficiency can be improved.

  Second, in the case of the above-described prior art, since the secondary air holes are formed in a wide range including the upper part of the right side wall 12E, the secondary air ejected from the secondary air holes above the flame F is seen from the side. Although hitting perpendicularly (interfering), there is a disadvantage that the thermal efficiency is lowered. However, in the pellet stove 10 according to the present embodiment, the secondary air is ejected obliquely upward with respect to the flame F. The next air does not interfere. Therefore, it is possible to suppress the secondary air from unnecessarily interfering with the flame F on the upper side of the combustion chamber 30. Thereby, since it becomes possible to transmit the heat of the flame F well to the upper part of the combustion chamber 30, it can suppress that the area | region where a heat exchange rate is bad in the upper part of the combustion chamber 30 is made. Therefore, the thermal efficiency can be improved also by this.

  Thirdly, in the pellet stove 10 according to the present embodiment, the chimney 65 extends in the vertical direction in the combustion chamber 30, and the combustion gas inlet 65 </ b> A of the chimney 65 is disposed in the lower part of the combustion chamber 30. Has been. For this reason, the high-temperature combustion gas generated in the combustion chamber 30 due to the combustion of the wood pellets 14 rises to the upper portion of the combustion chamber 30, and then the lower portion of the combustion chamber 30 in which the combustion gas intake 65A of the chimney 65 is disposed. , And further rises in the chimney 65 (gas passage 66) and is exhausted outside the apparatus (see arrow S in FIG. 1). Thereby, since the high-temperature combustion gas flows largely up and down in the combustion chamber 30 (the flow path of the combustion gas becomes longer), heat exchange can be performed evenly over the entire wall of the combustion chamber 30. Thermal efficiency can be improved.

  4thly, in the pellet stove 10 which concerns on this embodiment, since both the side parts 100A of the rectification | straightening member 100 are each arrange | positioned between the flame F, the front wall 12C, and the back wall 12D, the heat of the flame F is the front. Transmission to the wall 12C and the back wall 12D can be suppressed. Thereby, it can suppress that the front wall 12C and the back wall 12D become high temperature locally, and can suppress that the heat-resistant coating material apply | coated to the front wall 12C and the back wall 12D peels off by abnormally high temperature.

  In the pellet stove 10 according to the above embodiment, the plurality of secondary air holes 116 are formed over the entire circumference of the inner peripheral wall 102 of the rectifying member 100. However, the present invention is not limited to this, and faces the right side wall 12E. The secondary air hole 116 may be formed only in the portion, or the secondary air hole 116 may be formed only in the both side portions 100A orthogonal to the right side wall 12E.

  Furthermore, in the pellet stove 10 according to the above embodiment, the blower 42, the air passage 46, and the primary air hole 49 constitute the first air feeding means in the present invention, and the blower 42 provides the second air feeding means in the present invention. In other words, the air blower 42 is also used as the first air supply means (part of) and the second air supply means. However, the present invention is not limited to this. You may divide into for use and for secondary air supply.

  Moreover, although the said embodiment demonstrated the case where this invention was applied with respect to a pellet stove, this invention is applicable not only to this but the boiler etc. which use a wood pellet as a fuel.

It is a longitudinal cross-sectional view of the pellet stove which concerns on embodiment of this invention. FIG. 2 is a sectional view taken along line 2-2 of FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 1. It is a perspective view of the baffle member shown by FIG. It is the partial front view which looked at the baffle member shown by FIG. 4 from the wind guide path side.

Explanation of symbols

10 Pellet stove (wood pellet combustion equipment)
12C Front wall (side wall)
12D Back wall (side wall)
12E Right side wall (side wall)
12F Left side wall (side wall)
14 Wood pellet 30 Combustion chamber 32 Rooster (combustion shelf)
34 Ignition heater (combustion shelf)
40 Air hole (fuel shelf)
42 Blower (first air supply means, second air supply means)
46 Air passage (first air supply means)
49 Primary air hole (first air supply means)
DESCRIPTION OF SYMBOLS 100 Flow regulating member 102 Inner peripheral wall 104 Outer peripheral wall 106 Air guide path 112 Communication hole 114A Upper wall (inclined part)
116 Secondary air hole (secondary air ejection hole)

Claims (3)

A combustion shelf that is disposed in a lower portion of a combustion chamber separated by a side wall, has air permeability, and burns wood pellets supplied to the upper surface;
A first air supply means for supplying primary air for burning wood pellets by pressure or suction to the lower side of the combustion shelf;
A second air supply means for supplying secondary air for burning wood pellets to a secondary air supply path provided outside the combustion chamber;
An air guide passage disposed above the combustion shelf, formed in a substantially frame shape or a substantially ring shape so as to surround a flame generated when burning wood pellets, and communicated with the secondary air supply passage; An inclined part having a surface facing in the rising direction of the flame is formed by forming a longitudinal cross-sectional shape of the inner peripheral wall on the side facing the flame into a corrugated shape, and the inclined part against the flame A rectifying member formed with a plurality of secondary air ejection holes for ejecting secondary air obliquely upward;
Wood pellet burning device equipped with. The plurality of secondary air ejection holes are formed on substantially the entire circumference of the inner circumferential wall of the rectifying member,
2. The wood pellet combustion apparatus according to claim 1, wherein: The rectifying member is constituted entirely or principally by the inner peripheral wall and the outer peripheral wall that is disposed outside the inner peripheral wall and forms the air guide path with the inner peripheral wall.
The wood pellet combustion apparatus according to claim 1 or 2, characterized by the above.

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