JP2009198090A - Woody fuel combustion device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smoothly rotate a burner body without being affected by its thermal deformation in a combustion device burning pellet form woody fuel P, and comprising the cylindrical burner body 7 rotatably disposed in a lying attitude, a fuel supplying means 3 for supplying the woody fuel into the burner body from a front part, an air supplying means for supplying the air into the burner body, and a combustion chamber 8 communicated with a rear end of the burner body. <P>SOLUTION: The burner body 7 is provided with a burner outer cylinder 71 fixed in a state of surrounding the burner body with a clearance 73, and the air is guided to air holes 45 of a peripheral wall portion of the burner body 7 through the clearance 73. The burner body 7 is rotatably supported by a burner supporting means composed of front and rear rollers 74, 75 through the burner outer cylinder 71. Further the burner body 7 is formed into the tapered cylindrical shape of which a diameter is increased backward. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wood fuel combustion apparatus for burning pellet-like wood fuel such as wood pellets.

  Conventionally, as a combustion apparatus of this type, a cylindrical burner body that is rotatably disposed in a recumbent posture, a drive source that rotates the burner body, and the longitudinal direction of the burner body as the front-rear direction, Fuel supply means for supplying woody pellet-like fuel from the front, air supply means for supplying air into the burner body via air holes formed in the peripheral wall of the burner body, and combustion communicating with the rear end of the burner body What is provided with a chamber is known (for example, refer patent document 1).

  In this case, since the wood fuel rolls in the burner body due to the rotation of the burner body, the air touches the entire surface of the wood fuel and the combustion is promoted. In addition, an air flow toward the combustion chamber is generated in the burner body, and the combustion ash is gradually conveyed to the rear of the burner body by this air flow and the rotation of the burner body, and finally from the rear end of the burner body to the combustion chamber. As it falls, the wood fuel itself is also carried behind the burner body as combustion proceeds. Therefore, the continuous combustion of the wood fuel in the burner main body becomes possible.

  Here, in the above-described conventional example, a cylindrical support case surrounding the burner main body is provided, and air is supplied from the front to the gap between the burner main body and the support case by the air supply means. Air is guided to the air holes in the peripheral wall portion of the burner body. In addition, an air hole for secondary air is formed in the rear part of the peripheral wall of the burner body, and secondary air is supplied from the air hole to the combustion chamber via the burner body, and combustible gas flowing from the burner body to the combustion chamber. The property gas is completely burned in the combustion chamber. Then, a seal portion is provided at the rear end of the support case so as to be in sliding contact with the outer peripheral surface of the burner body in a state where the gap between the burner body and the support case is closed, and is supplied to the gap between the burner body and the support case. The sealed air prevents the air from flowing out behind the gap so that the secondary air sufficiently flows into the burner body from the air hole at the rear of the burner body. Note that the front end portion of the burner body is rotatably supported via a roller.

  In the above-mentioned conventional example, the burner body is rotatably supported by the roller and the seal part at the front end part and the rear end part, respectively, but the axis is displaced due to thermal deformation of the burner body, and the burner body is smooth. It may stop rotating. Furthermore, since the rear end portion of the burner body rotates while rubbing the seal portion, the load on the rotation drive source of the burner body increases due to friction.

Further, in the above conventional example, the burner body is inclined downward and rearward so that the combustion ash is reliably conveyed to the rear of the burner body. Therefore, a thrust force due to the weight of the burner body acts on the roller supporting the burner body, and the durability of the roller is adversely affected.
JP 2007-147104 A

  In view of the above, it is a first object of the present invention to improve the above-described conventional wood fuel combustion apparatus so that the burner body can be smoothly rotated without being affected by the thermal deformation thereof. Also, the second object is to reduce the load of the rotation drive source of the burner body, and the combustion ash is reliably conveyed to the rear of the burner body without tilting the burner body downward. The third purpose is to make it possible.

  The present invention is a combustion apparatus for burning a pellet-like wood fuel, a cylindrical burner body arranged in a recumbent posture, burner support means for rotatably supporting the burner body, and rotating the burner body Drive source, fuel supply means for supplying wood fuel from the front into the burner body with the longitudinal direction of the burner body as the longitudinal direction, and air into the burner body through air holes formed in the peripheral wall of the burner body In order to achieve the first object, the burner body is provided so as to surround the burner body with a gap in between the supply air supply means and the combustion chamber communicating with the rear end of the burner body. The burner outer cylinder is fixed, and the air supply means is configured to supply air from the front to the gap between the burner body and the burner outer cylinder, and to guide the air to the air hole through the gap. The main body passes through the burner outer cylinder. Characterized in that it is rotatably supported by the burner support means.

  According to the present invention, the burner outer cylinder is air-cooled by the air flowing in the gap between the burner body and the burner outer cylinder. Therefore, even if the burner body is thermally deformed, there is no axial displacement caused by the heat deformation of the burner outer cylinder. Since the burner body is supported by the burner support means via the burner outer cylinder, the burner body can be smoothly rotated without being affected by the thermal deformation thereof.

  In order to achieve the second object, in the present invention, it is desirable that the burner support means is configured to rotatably support the front part and the rear part of the burner outer cylinder via respective rollers. . Here, in the present invention, since air is supplied through a gap between the burner body and the fixed burner outer cylinder, the rear part of the burner outer cylinder is pivotally supported by the seal portion as in the conventional example. It is not necessary to do so, and the rear part of the burner outer cylinder can be rotatably supported by a roller in the same manner as the front part. As a result, there is no friction as in the case of axial support by the seal portion, and the load on the drive source that rotates the burner body can be reduced.

  In order to achieve the third object, in the present invention, the burner body is preferably formed in a cylindrical shape with a taper that increases in diameter toward the rear. According to this, even if the burner body is arranged so that its axis is horizontal, the lower busbar of the burner body is inclined downwardly, so that the combustion ash is reliably conveyed to the rear of the burner body, It falls into the combustion chamber from the rear end of the burner body. And by arranging the burner body and the burner outer cylinder horizontally, the thrust force due to the weight of the burner body and the burner outer cylinder does not act on the burner support means, and the deterioration of the durability of the burner support means due to the thrust force is prevented. The

  Furthermore, in the present invention, it is desirable that a part of the air supplied to the gap between the burner body and the burner outer cylinder is supplied to the combustion chamber from the rear end of the gap. According to this, the rear end portion of the burner main body and the burner outer cylinder inserted into the combustion chamber is air-cooled by the air flowing toward the combustion chamber, and thermal deformation due to overheating of the burner main body and the rear end portion of the burner outer cylinder is effective. Is prevented.

  Referring to FIG. 1, reference numeral 1 denotes a boiler that is a woody fuel combustion apparatus according to an embodiment of the present invention that supplies hot water to a hot water load L such as a heating device or a snow melting device. As shown in FIGS. 2 and 3, the boiler 1 includes a combustion means 2, a fuel supply means 3 that supplies the combustion means 2 with wood pellets P that are pelleted wood fuel, and combustion air to the combustion means 2. The air supply means 4 to supply, the heat exchange means 5 which heats water with the heat | fever of the combustion exhaust gas discharged | emitted from the combustion means 2, and the exhaust means 6 which discharge | emits combustion exhaust gas outside are provided.

  The combustion means 2 communicates with a cylindrical burner body 7 that is rotatably disposed in a recumbent posture, and a rear end (left end in FIG. 2) of the burner body 7 with the longitudinal direction of the burner body 7 as the longitudinal direction. And a combustion chamber 8 for burning a combustible gas generated by burning the wood pellets P in the burner body 7.

  With reference to FIG. 4, a burner outer cylinder 71 surrounding the burner body 7 is fixed to the burner body 7. The front end of the burner body 7 is closed by the front lid portion 7a, and the front end of the burner outer cylinder 71 is also closed by the front lid portion 71a at the front position of the front lid portion 7a of the burner body 7, and the front lid portions 7a and 71a are connected. The burner outer cylinder 71 is fixed to the burner body 7 by being connected by the pin 72. The burner outer cylinder 71 has a larger diameter than the burner body 7, and a gap 73 is secured between the burner body 7 and the burner outer cylinder 71.

  The burner outer cylinder 71 is inserted into a cylindrical support case 9 having an inner diameter larger than that of the burner outer cylinder 71. The support case 9 is fixed to the front surface of the combustion chamber 8 via a fixing plate 91 at the rear end. The burner body 7 is rotatably supported via a burner outer cylinder 71 before and after the support case 9.

  Specifically, a dish-shaped air supply duct 42 that connects an air supply fan 41 that is a component of the air supply means 4 is fixed to the front end of the support case 9, and the outer periphery of the front end portion of the burner outer cylinder 71 is annular. A plate 74a is attached, and a plurality of rollers 74 that are in contact with the inner peripheral surface of the cylindrical peripheral wall portion of the air supply duct 42 are rotatably attached to the annular plate 74a as shown in FIG. Further, an annular plate 75a is attached to the fixed plate 91 at the rear end of the support case 9, and the annular plate 75a is applied to the outer peripheral surface of the cylindrical peripheral wall portion of the burner outer cylinder 71 as shown in FIG. A plurality of rollers 75 that are in contact with each other are axially attached. Thus, the burner outer cylinder 71 is rotatably supported by the support case 9 via the rollers 74 and 75 at the front and rear parts thereof. A plurality of rollers 75 that support the rear portion of the burner outer cylinder 71 are arranged on the lower half side of the burner outer cylinder 71, and only one roller 75 is arranged on the upper half side. This is so that even if the rear portion of the burner outer cylinder 71 is thermally expanded, it can be smoothly rotated.

  Here, the burner body 7 is formed in a cylindrical shape with a taper that increases in diameter toward the rear. For this reason, even if the burner body 7 is arranged so that its axis is horizontal, the lower bus bar of the burner body 7 is inclined downward and the combustion ash in the burner body 7 is carried rearward, and the combustion chamber 8 is easily discharged. Therefore, it is not necessary to make the burner body 7 and the burner outer cylinder 71 in an inclined posture that is rearwardly lowered in order to discharge the combustion ash. Unlike the case where the burner main body 7 and the burner outer cylinder 71 are supported in an inclined posture, the thrust force due to the weight of the burner main body 7 and the burner outer cylinder 71 does not act on the rollers 74 and 75 as the burner support means. It is possible to prevent the durability of the rollers 74 and 75 from being adversely affected, and it is possible to prevent the rotation axis of the burner from being shifted in the tilt direction and having an adverse effect.

  A hollow cylinder shaft 76 that passes through the center of the front surface of the air supply duct 42 and protrudes forward is fixed to the front lid 71 a of the burner outer cylinder 71. Further, a rotation motor 77 serving as a drive source for the burner body 7 is disposed in front of and below the air supply duct 42 and is connected to a drive sprocket 77a on the output shaft of the rotation motor 77 via a chain 77b. A driven sprocket 77 c is fixed to the front end of the cylindrical shaft 76. Thus, the burner body 7 is rotated integrally with the burner outer cylinder 71 by the rotation motor 77. A bearing 76a that supports the cylindrical shaft 76 so as not to move in the front-rear direction is attached to a portion where the cylindrical shaft 76 penetrates the air supply duct 42.

  Referring to FIG. 3, a pair of micro switches 78 and 78 are attached to the front surface of air supply duct 42 so as to be spaced apart from each other in the circumferential direction. A switch arm 78 a is fixed to the cylinder shaft 76, and the rotation direction of the rotation motor 77 is reversed each time the switch arm 78 a comes into contact with each micro switch 78. Thus, the burner body 7 is repeatedly rotated in the forward and reverse directions between a rotational position where the switch arm 78 a abuts against one micro switch 78 and a rotational position where the switch arm 78 a abuts the other micro switch 78.

  A large number of air holes 43 are formed in the front lid portion 71a of the burner outer cylinder 71 as shown in FIGS. Also, as shown in FIGS. 4 and 6, a large number of air holes 44 are formed in the front lid portion 7 a of the burner body 7, and a large number of air holes 45 are also formed in the peripheral wall portion of the burner body 7. ing. Then, the air blown from the air supply fan 41 into the air supply duct 42 passes through the air hole 43 of the front lid portion 71 a of the burner outer cylinder 71 and passes through the air hole 44 of the front lid portion 7 a of the burner body 7. While flowing into the burner body 7, it flows into the burner body 7 from the air hole 45 in the peripheral wall portion of the burner body 7 through a gap 73 between the burner body 7 and the burner outer cylinder 71. Further, the rear end of the gap 73 between the burner body 7 and the burner outer cylinder 71 communicates with the combustion chamber 8. Therefore, a part of the air flowing into the gap 73 is supplied to the combustion chamber 8 as secondary combustion air.

  The fuel supply means 3 includes a fuel tank 31 for storing the wood pellets P, a supply pipe 32 for dropping the wood pellets P, and an upper end of the supply pipe 32 from the lower end of the fuel tank 31. A first conveying screw 33 driven by a first conveying motor 33a as a first conveying means for conveying the wood fuel to the inside, and a wood pellet P into the burner body 7 from the lower end of the supply pipe 32 positioned in front of the burner body 7. And a second conveying screw 34 that is driven by a second conveying motor 34a. Wood pellets P are introduced into the fuel tank 31 from the external tank T shown in FIG. 1 through the introduction pipe 31a as needed.

  The second conveying screw 34 is inserted through the cylindrical shaft 76. A fuel inlet 35 is opened at the center of the front lid 7 a of the burner body 7, and the rear end of the second conveying screw 34 faces the fuel inlet 35. In the burner body 7, a heat shield plate 36 is provided so as to face the fuel inlet 35 and prevent the radiant heat from the burner body 7 from reaching the second conveying screw 34.

  A fire damper 37 is provided at the connection port of the supply pipe 32 to the first conveying screw 33. The fireproof damper 37 is supported by an upper end shaft 37a so as to be freely opened and closed, and is normally sealed by a spring force (not shown), and when the wood pellet P is conveyed toward the supply pipe 32 by the first conveying screw 33. It is opened by a solenoid not shown. Further, a temperature sensor 38 serving as a backfire detecting means is provided at the upper end portion of the supply pipe 32 to detect when the wood pellet P is ignited by the second conveying screw 34 to cause backfire to the supply pipe 32. It has been.

  An igniter 10 is attached to the air supply duct 42. The igniter 10 includes a cylindrical body 101 that is provided at a lower portion of the front surface of the air supply duct 42 and guides part of the air from the air supply fan 41, and an ignition heater 102 that is loosely inserted into the cylindrical body 101. The ignition heater 102 faces the ignition hole 103 formed in the lower part of the front lid portion 7a of the burner body 7. Then, the air supplied to the cylinder 101 is heated by the ignition heater 102, becomes hot hot air, flows into the burner body 7 from the ignition hole 103, and is introduced into the burner body 7 from the fuel inlet 35. The wood pellet P is heated and ignited by hot air and radiant heat from the ignition heater 102. An arc-shaped escape hole 104 for the ignition heater 102 is formed in the front lid portion 71a of the burner outer cylinder 71 as shown in FIG.

  The peripheral wall portion of the support case 9 has an inner / outer double cylinder structure of an inner cylinder 92 and an outer cylinder 93. A water inlet 94 a and a water outlet 94 b are provided in the outer cylinder 93, and a water jacket 94 is configured by a space between the inner cylinder 92 and the outer cylinder 93.

  The heat exchange means 5 includes a primary heat exchanger 51 disposed on the combustion chamber 8 and a secondary heat exchanger 52 composed of a liquid heat exchanger for flowing water heated by the primary heat exchanger 51. . The primary heat exchanger 51 includes a plurality of heat exchange pipes 51a through which combustion exhaust gas from the combustion chamber 8 flows, and water flowing into the primary heat exchanger 51 is generated by the heat of the combustion exhaust gas through the heat exchange pipe 51a. Heated. The hot water heated by the primary heat exchanger 51 is returned to the primary heat exchanger 51 via the primary circulation pump 53, the secondary heat exchanger 52, and the water jacket 94. The secondary heat exchanger 52 includes a secondary-side forward pipe 52a that sends the heated hot water to the hot water load L, and returns the hot water from the hot water load L via the secondary circulation pump 54 (see FIG. 1). The secondary return pipe 52b is connected.

  A screw-like baffle member 51b is inserted into the heat exchange pipe 51a. The ash contained in the combustion exhaust gas is collected by the baffle member 51 b and falls into the combustion chamber 8. A discharge screw 81 driven by a discharge motor 81 a is disposed at the bottom of the combustion chamber 8. The ash that has fallen to the bottom of the combustion chamber 8 is discharged to the outside by the discharge screw 81.

  The exhaust means 6 includes an exhaust duct 61 that is disposed on the primary heat exchanger 51 and into which the combustion exhaust gas that has passed through the heat exchange pipe 51 a flows, and an exhaust fan 62 that performs exhaust from the exhaust duct 61.

  The boiler 1 is a controller as a control means for controlling the first and second transport motors 33a and 34a, the air supply fan 41, the circulation pumps 53 and 54, the exhaust fan 62, the rotation motor 77, the discharge motor 81a, and the ignition heater 102. 11 and a remote controller 12 is connected to the controller 11 (see FIG. 1). Hereinafter, control by the controller 11 will be described with reference to FIG.

  When an ignition command is issued by turning on the operation switch of the remote controller 12, the controller 11 first operates the primary circulation pump 53 to supply water to the primary heat exchanger 51, the secondary heat exchanger 52, and the water jacket 94. Circulate (S1). Further, the operation of the secondary circulation pump 54 starts the hot water circulation between the secondary heat exchanger 52 and the hot water load L. Next, the air supply fan 41 and the exhaust fan 62 are rotated at a low speed to perform a pre-purge operation for a predetermined time (for example, 10 seconds) (S2). The rotational speed of the air supply fan 41 and the exhaust fan 62 can be switched between three levels of low, medium, and high. However, at any speed, the exhaust air amount of the exhaust fan 62 is greater than the air supply amount of the air supply fan 41. Is going to increase. Therefore, an airflow that flows backward toward the combustion chamber 8 is generated in the burner body 7, and hot air does not flow backward from the burner body 7 to the fuel supply means 4.

  When the pre-purge process is completed, the controller 11 energizes the ignition heater 102 and performs an ignition process for operating the first and second transport motors 33a and 34a at a low speed for a predetermined time (for example, 180 seconds) (S3). . According to this, the wood pellet P is transported to the supply pipe 32 by the first transport screw 33, dropped and then transported by the second transport screw 34, and is transported from the fuel inlet 35 into the burner body 7. Pellets P are charged. Then, the wood pellet P put into the burner body P is heated and ignited by the hot air blown from the ignition heater 102 through the ignition hole 103 and the radiant heat of the ignition heater 102.

  Next, a preliminary combustion operation is performed in which the supply fan 41 and the exhaust fan 62 are rotated at medium speed and the first and second transport motors 33a and 34a are restarted at low speed (S4). Thereby, the new wood pellet P is supplied to the wood pellet P ignited in the burner main body 7, and combustion is gradually expanded.

  Thereafter, when the preliminary combustion operation is completed, the operation shifts to the forced combustion operation (S5). Next, it is determined whether or not the combustion of the wood pellet P is detected by combustion detection means such as an exhaust temperature sensor (not shown) (S6), and a predetermined waiting time (for example, 480 seconds) has elapsed from the start of the forced combustion operation. If combustion is not detected even after a lapse (S7), the process proceeds to a forced post operation described later.

  In the forced combustion operation, the energization to the ignition heater 102 is stopped, and the first and second transport motors 33a and 34a are operated at a medium speed while the supply fan 41 and the exhaust fan 62 are rotated at a medium speed. At the same time, the burner body 7 is repeatedly rotated at a low speed by the rotation motor 77. Thereby, the wood pellet P supplied in the burner main body 7 moves, the combustion area in the burner main body 7 is expanded, and stable combustion comes to be performed.

  When combustion of the wood pellet P is detected during the forced combustion operation (S6), the routine proceeds to the main combustion operation (S8). In this combustion operation, the supply fan 41, the exhaust fan 62, and both the first and second transport motors 33a are selected according to the temperature deviation between the hot water temperature circulated through the hot water load L and the set temperature set by the remote controller 12. , 34a and the speed of the rotation motor 77 are varied. For example, when the temperature deviation is small, the speeds of the air supply fan 41, the exhaust fan 62, the first and second transport motors 33a and 34a, and the rotation motor 77 are reduced, and when the temperature deviation is large, these speeds. Make it faster.

  At the time of the main combustion operation, the wood pellet P rolls on the inner peripheral surface of the burner body 7 by the rotation of the burner body 7, and air touches the entire surface of the wood pellet P, thereby promoting combustion. In the front part of the burner body 7, the wood pellets P are burned in a so-called state, and the combustible gas generated by this combustion is completely burned in the combustion chamber 8. Further, an air flow toward the combustion chamber 8 is generated in the burner body 7, and the combustion ash is gradually formed in the burner body 7 by the air flow, the rotation of the burner body 7, and the downward slope of the bus bar on the lower side of the burner body 7. It is carried rearward and finally falls into the combustion chamber 8 from the rear end of the burner body 7. Furthermore, the wood pellet P itself is also carried to the rear of the burner body 7 as the combustion proceeds. Therefore, the wood pellet P can be continuously burned while being supplied to the burner body 7.

  Here, if radiant heat due to combustion in the burner body 7 reaches the second conveying screw 34 via the fuel inlet 35, the wood pellet P may be ignited by the second conveying screw 34 during combustion. However, in the present embodiment, since the heat shield plate 36 facing the fuel inlet 35 is provided in the burner body 7, the second conveying screw 34 does not receive radiant heat, and the second conveying screw 34 uses the wood pellets. P firing is effectively prevented.

  Although not shown in FIG. 7, when the second conveying screw 34 causes a backfire due to the ignition of the wood pellet P, and this is detected by the temperature sensor 38 for detecting the backfire, the first conveying screw 33. Control to stop. According to this, the fireproof damper 37 provided at the connection port of the supply pipe 32 with respect to the first transport screw 33 is closed, and the flame is blocked by the fireproof damper 37 and does not reach the first transport screw 33. Therefore, ignition to the fuel tank 31 is reliably prevented.

  Here, the burner body 7 is heated to a considerably high temperature during combustion and causes thermal deformation. On the other hand, the burner outer cylinder 71 is air-cooled by the air flowing in the gap 73 between the burner body 7. Therefore, even if the burner main body 7 is thermally deformed, the axial displacement due to the heat deformation of the burner outer cylinder 71 does not occur. Since the burner body 7 is supported by the rollers 74 and 75 via the burner outer cylinder 71, the burner body 7 can be smoothly rotated without being affected by the thermal deformation thereof. Further, since the burner outer cylinder 71 is supported by the rollers 74 and 75 at both the front part and the rear part thereof, friction is not generated and the load of the rotating motor 77 is reduced. Further, the rear end portions of the burner body 7 and the burner outer cylinder 71 inserted into the combustion chamber 8 are air-cooled by the air flowing into the combustion chamber 8 through the gap 73 therebetween, and the burner body 7 and the burner outer cylinder 71 are rearward. Thermal deformation due to overheating of the end is effectively prevented.

  When a fire extinguishing command is issued by turning off the operation switch of the remote controller 12 (S9), a forced post operation for a predetermined time (for example, 300 seconds) is performed (S10). In the forced post operation, the first transport motor 33a is stopped, and the air supply fan 41, the exhaust fan 62, the rotation motor 77, and the second transport motor 34a are operated at high speed. According to this, the supply of the wood pellets P to the supply pipe 32 by the first transport screw 33 is stopped, and the wood pellets P remaining in the supply pipe 32 and the second transport screw 34 are all burned by the second transport screw 34. 7 and is burned in the burner body 7. Therefore, the wood pellet P does not remain in the supply pipe 32 and the second conveying screw 34 during fire extinguishing, and the ignition of the wood pellet P in the fuel supply means 3 is prevented.

  When the forced post operation is completed, a post purge operation for a predetermined time (for example, 300 seconds) is performed (S11). In the post-purge operation, the second transport motor 34a is stopped, and the air supply fan 41, the exhaust fan 62, and the rotation motor 77 are operated at a low speed. Thereby, the ash produced by the combustion of the wood pellets P in the forced post operation is sent to the combustion chamber 8. When the post-purge operation is completed, an operation end process for stopping the primary circulation pump 53, the secondary circulation pump 54, the air supply fan 41, the exhaust fan 62, and the rotation motor 77 is performed (S12).

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, in the above-described embodiment, the burner body 7 is repeatedly rotated forward and backward within a predetermined angle range, but the burner outer cylinder 7 may be continuously rotated in one forward and reverse direction. Moreover, although the said embodiment applies this invention to a boiler, this invention is applicable similarly to combustion apparatuses other than the boiler which burns a pellet-like woody fuel.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing which shows the whole structure of the boiler which is a combustion apparatus of embodiment of this invention. The front view which shows the inside of the boiler of embodiment. The side view of the principal part seen from the right side of FIG. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. FIG. 5 is a sectional view taken along line VV in FIG. 4. FIG. 6 is a sectional view taken along line VI-VI in FIG. 4. The flowchart which shows the content of the combustion control of the boiler of embodiment.

Explanation of symbols

  P: wood pellet (wood fuel), 1 boiler (wood fuel combustion device), 3 fuel supply means, 4 air supply means, 45 air holes in the peripheral wall of the burner body, 7 burner body, 71 burner Outer cylinder, 73: a gap between the burner body and the burner outer cylinder, 74, 75 ... rollers (burner support means), 77 ... rotating motor (drive source), 8 ... combustion chamber.

Claims (4)

A combustion apparatus for burning pellet-shaped wood fuel, a cylindrical burner body arranged in a lying position, burner support means for rotatably supporting the burner body, and a drive source for rotating the burner body Suppose that the longitudinal direction of the burner body is the longitudinal direction, the fuel supply means for supplying wood fuel into the burner body from the front, and the air supply for supplying air into the burner body through the air holes formed in the peripheral wall of the burner body And a combustion chamber communicating with the rear end of the burner body,
The burner body includes a burner outer cylinder that is fixed so as to surround the burner body with a gap.
The air supply means is configured to supply air from the front to the gap between the burner main body and the burner outer cylinder, and to guide the air to the air hole through the gap.
A wood fuel combustion apparatus, wherein a burner body is rotatably supported by a burner support means via a burner outer cylinder.   2. The woody fuel combustion apparatus according to claim 1, wherein the burner support means is configured to rotatably support a front portion and a rear portion of the burner outer cylinder via respective rollers.   3. The wood fuel combustion apparatus according to claim 1, wherein the burner body is formed in a cylindrical shape having a taper that expands toward the rear.   The part of the air supplied to the said clearance gap between the said burner main body and the said burner outer cylinder is supplied to the said combustion chamber from the rear end of this clearance gap. The woody fuel combustion apparatus according to the item.

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