JP2011185546A - Combustion device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance a purification rate of hot air by increasing a recovery rate of ash and soot. <P>SOLUTION: This combustion device 100 includes: a pellet burner 110 with a burner port 111 burning a burning object and supplying combustion heat; a first combustion furnace 120 guiding combustion heat supplied from the burner port 111 upwardly; a second combustion furnace 130 connected to the first combustion furnace 120 by a connection pipe 140; and a combustion heat discharge port 134 provided in a vertical intermediate portion of the second combustion furnace 130 and discharging the combustion heat from the second combustion furnace 130. The connection pipe 140 interconnects a position on the upper side from the burner port 111 of the first combustion furnace 120 and a position on the upper side from the combustion heat discharge port 134 of the second combustion furnace 130. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a combustion apparatus that obtains hot air by burning combustibles, particularly pellets.

  Conventionally, there exists a thing of patent document 1 as a combustion apparatus. The combustion apparatus described in Patent Literature 1 includes a main combustion chamber that burns solid fuel, and a sub-combustion chamber that communicates with the main combustion chamber in series via a communication path.

JP 2008-1222021 A

  However, the combustion apparatus described in Patent Literature 1 discharges the combustion heat generated in the main combustion chamber from the upper part of the sub-combustion chamber to the outside. For this reason, the combustion heat cannot be effectively used, and ash and soot generated in the main combustion chamber are also discharged to the outside.

  It is an object of the present invention to provide a combustion apparatus in which the combustion heat is prevented from flowing out and the combustion heat is effectively used and the ash and soot recovery rate is increased to increase the hot air purification rate. .

  The present invention includes a combustion section having a combustion heat supply port for supplying combustion heat by burning combustion products, a first combustion furnace for guiding the combustion heat supplied from the combustion heat supply port upward, and the first A second combustion furnace connected to one combustion furnace by a connection pipe, and a combustion heat discharge section provided at an intermediate portion in the vertical direction of the second combustion furnace for discharging the combustion heat from the second combustion furnace, The connecting pipe connects a position above the combustion heat supply port of the first combustion furnace and a position above the combustion heat discharge part of the second combustion furnace. The present invention relates to a combustion apparatus.

  Moreover, it is preferable that the inner walls of the first combustion furnace and the second combustion furnace are formed of refractory bricks.

  The first combustion furnace and the second combustion furnace are preferably formed in a cylindrical shape.

  According to the combustion apparatus of the present invention, the hot air generated by the combustion of the combustion product ascends the first combustion furnace, passes through the connection pipe, descends the second combustion furnace, and is discharged from the combustion heat discharge unit. For this reason, according to the present invention, the combustion heat hardly leaks to the outside, and the combustion heat can be effectively used.

  Further, ash and soot rise in the first combustion furnace together with the hot air, but often fall before reaching the connection pipe, and rarely flow into the second combustion furnace. Even if there is ash or soot flowing into the second combustion furnace, the combustion heat exhausting part is provided below the connection pipe and in the middle part of the second combustion furnace, so 2 Accumulated at the bottom of the combustion furnace and rarely discharged from the combustion heat discharge section. For this reason, according to the present invention, it is possible to increase the recovery rate of hot air by increasing the recovery rate of ash and soot.

  Moreover, according to the combustion apparatus of this invention, if the inner wall of a 1st combustion furnace and a 2nd combustion furnace is formed with a refractory brick, a combustion furnace can be used for a long period of time.

  Further, according to the combustion apparatus of the present invention, when the first combustion furnace and the second combustion furnace are formed in a cylindrical shape, there is no portion where ash and soot stay on the inner walls of the first combustion furnace and the second combustion furnace. , Can improve the recovery rate of ash and straw.

1 is an overall plan view of a wood pellet manufacturing plant equipped with a combustion apparatus according to an embodiment of the present invention. It is sectional drawing of the combustion apparatus which concerns on embodiment of this invention. FIG. 3 is a plan view of FIG. 2.

  Hereinafter, a combustion apparatus according to an embodiment of the present invention will be described with reference to the drawings. The combustion apparatus is incorporated in a wood pellet manufacturing plant.

  FIG. 1 is an overall plan view of a wood pellet manufacturing plant. The wood pellet production plant 10 is a plant for producing wood pellets, and can contribute to the reduction of carbon dioxide by using wood pellets as a superheat source.

  The primary supply machine 11 supplies the wood pellets before drying to the wood pellet production plant 10. The wood pellets supplied by the primary feeder 11 are redirected in the conveying direction by three belt conveyors 12, 13, 14, and the combustion heat exhaust port 134 (FIG. 2) of the combustion apparatus 100 and the inlet of the rotary kiln 16. It is conveyed during As for the belt conveyor 13, the height of the downstream side of the conveyance direction which conveys a wood pellet is higher than the upstream side. For this reason, the belt conveyor 14 is installed diagonally away from the floor.

  The rotary kiln 16 has a rotatable cylindrical drying drum installed sideways. The wood pellets are supplied into a drying drum of the rotary kiln 16 and are dried by hot air from the combustion device 100 while being conveyed away from the combustion device 100 by rotation of the drying drum.

  Thereafter, the wood pellets are fed into the cyclone 18 by the blower 17 and pulverized into particles by the pulverizer 19. The particulate wood pellets are fed into the secondary feeders 22 and 23 by the screw conveyors 20 and 21. The screw conveyors 20 and 21 are provided at positions higher than the secondary supply units 22 and 23 apart from the floor in order to supply the wood pellets to the secondary supply units 22 and 23. The secondary supply machine 23 sends the particulate wood pellets to the belt conveyor 24. The upstream end of the belt conveyor 24 is connected to the lower part of the secondary feeder 22, and the upstream end is installed at a position away from the floor. For this reason, the belt conveyor 24 has a downstream end at a high position and is inclined. Then, the wood pellets are fed into the pelletizer 27 by the screw conveyor 25 and the belt conveyor 26 and are heated to be formed into a predetermined shape.

  The wood pellets formed in a predetermined shape are fed into the vibration sorter 29 by the cooling conveyor 28, and are sorted into pellets of a predetermined size and pellets other than the predetermined size by the vibration sorter 29. The pellets of a predetermined size are sent to the product rack 30. The wood pellets sent to the product rack are stored in a predetermined place.

  The wood pellets selected by the vibration sorter 29 to a size other than a predetermined size are sent back to the grinder 19 by the unformed pellet conveying device 31 and crushed.

  The wood pellets are also supplied to the belt conveyor 13 from the cyclone 32 via the supply blower 33 and the cyclone 34.

  In the wood pellet manufacturing plant 10 described above, the equipment of the plant is arranged in a three-dimensional manner by installing the belt conveyors 13, 24, etc. in an inclined manner, and the wood pellets (raw material chips) are arranged in a three-dimensional space. Since it moves, the drying capacity of a wood pellet can be improved and the installation floor area of an installation can be made small.

  FIG. 2 is a cross-sectional view of the combustion apparatus in the embodiment of the present invention. FIG. 3 is a plan view of FIG.

  The combustion apparatus 100 is a heating heat source of the wood pellet manufacturing plant 10 and includes a pellet burner 110 that does not use fossil fuel and burns wood pellets having a low environmental load.

  In addition, the combustion apparatus 100 includes a first combustion furnace 120, a second combustion furnace 130, and a connection pipe 140 that connects the first combustion furnace 120 and the second combustion furnace 130.

  The first combustion furnace 120 is vertically formed in a cylindrical shape and has a sealed head, an upper portion of the inner wall is formed of casters, and an intermediate portion and a lower portion of the inner wall are formed of refractory bricks 124. The entire inner wall may be formed of refractory bricks.

  An ash collection port 121 for collecting the ash of the burned wood pellets and a door 122 for opening and closing the ash collection port 121 are provided at the lower part of the first combustion furnace 120. A burner port 111 of the pellet burner 110 is provided upward in the lower part of the first combustion furnace 120. The ash collection port 121 and the burner port 111 are provided at substantially the same height. A combustion confirmation window 123 for visually confirming the flame of the pellet burner 110 in the first combustion furnace 120 is formed at an intermediate portion in the vertical direction of the first combustion furnace 120.

  The second combustion furnace 130 is also formed vertically in a cylindrical shape with the head sealed, the upper part of the inner wall is formed of casters, and the middle part and the lower part of the inner wall are formed of refractory bricks 135. In addition, you may form the whole inner wall with a refractory brick.

  An ash collection port 131 for collecting the ash of the burned wood pellets and a door 132 for opening and closing the ash collection port 131 are provided at the lower part of the second combustion furnace 130. A combustion heat discharge port 134 for discharging the combustion heat of the pellet burner 110 is provided laterally in the lower part of the second combustion furnace 130. The ash recovery port 131 is provided at a position lower than the combustion heat discharge port 134. A combustion confirmation window 133 for visually confirming the state in the second combustion furnace 130 is formed in the middle portion of the second combustion furnace 130 in the vertical direction.

  The connection pipe 140 connects the upper part of the first combustion furnace 120 and the upper part of the second combustion furnace 130. Specifically, the connection pipe 140 is located above the burner port 111 of the pellet burner 110 and the combustion heat discharge port 134. The connection pipe 140 connects a position deviated from the center of the first combustion furnace 120 and the center of the second combustion furnace 130, but does not necessarily need to be at this position.

  In the combustion apparatus 100 having the above configuration, the pellet burner 110 burns the wood pellets and continuously discharges the combustion heat from the burner port 111. For this reason, the flame F comes out from the burner port 111. However, the tip of the flame F does not reach the connection pipe 140. That is, the distance L between the burner port 111 and the connection pipe 140 is set to a length that prevents the tip of the flame F generated from the burner port 111 from reaching the connection pipe 140 when the pellet burner 110 is burned to the maximum. The tip of the flame F does not reach the connection pipe 140. Therefore, the hot air of the pellet burner 110 enters the connection pipe 140 without the tip of the flame F entering the connection pipe 140.

  In this way, the hot air exits from the burner port 111 of the pellet burner 110, rises in the first combustion furnace 120, descends in the second combustion furnace 130 via the connection pipe 140, and burns out the combustion heat discharge port 134. Enter the rotary kiln 16. In this case, the ash and soot coming out of the burner port 111 of the pellet burner 110 together with the hot air soars in the first combustion furnace 120 so that the tip of the flame F does not reach the connection pipe 140. The connection pipe 140 is hardly penetrated. Even if ash or soot may enter the second combustion furnace 130, the combustion heat exhaust port 134 is provided below the connection pipe 140 and in the middle part of the second combustion furnace 130. It collects from the pipe 140 as it is at the bottom of the second combustion furnace 130.

  The ash and soot collected at the bottom of the first combustion furnace 120 and the second combustion furnace 130 can be recovered from the ash recovery ports 121 and 131 by opening the doors 122 and 132.

  According to the combustion apparatus 100 of the present embodiment, the following effects are obtained.

  The combustion apparatus 100 of the present embodiment includes a pellet burner 110 as a combustion unit having a burner port 111 as a combustion heat supply port for burning combustion products and supplying combustion heat, and combustion heat supplied from the burner port 111. The first combustion furnace 120 guided upward, the second combustion furnace 130 connected to the first combustion furnace 120 by the connection pipe 140, and the intermediate portion in the vertical direction of the second combustion furnace 130, the combustion heat is supplied to the first combustion furnace 120. 2 and a combustion heat discharge port 134 as a combustion heat discharge unit that discharges from the combustion furnace 130, and the connection pipe 140 is positioned above the burner port 111 of the first combustion furnace 120 and the combustion of the second combustion furnace 130. It is characterized in that a position above the heat exhaust port 134 is connected.

  For this reason, in the combustion apparatus 100 of the present invention, the hot air generated by the combustion of the combustion product ascends the first combustion furnace 120, passes through the connection pipe 140, descends the second combustion furnace 130, and discharges the combustion heat It is discharged from 134.

  Therefore, the combustion apparatus 100 of the present invention is less likely to leak combustion heat to the outside and can effectively use the combustion heat.

  Further, ash and soot rise in the first combustion furnace 120 together with the hot air, but often fall before reaching the connection pipe 140 and rarely flow into the second combustion furnace 130. Even if there is ash or soot flowing into the second combustion furnace 130, the combustion heat exhaust port 134 is provided below the connection pipe 140 and in the middle part of the second combustion furnace 130. Soot accumulates at the bottom of the second combustion furnace 130 and is rarely discharged from the combustion heat discharge port 134.

  Therefore, the combustion apparatus 100 of the present invention can increase the recovery rate of hot air by increasing the recovery rate of ash and soot.

  In the combustion apparatus 100 of the present invention, the inner walls of the first combustion furnace 120 and the second combustion furnace 130 are formed of refractory bricks 124 and 135.

  The refractory bricks 124 and 135 are provided on the entire inner walls of the first combustion furnace 120 and the second combustion furnace 130 or on the lower part of the intermediate part of the inner walls of the first combustion furnace 120 and the second combustion furnace 130. May be.

  Since the inner wall of the first combustion furnace 120 and the second combustion furnace 130 is formed of refractory bricks 124 and 135, the combustion apparatus 100 of the present invention can withstand long-term use.

  In the combustion apparatus 100 of the present invention, the first combustion furnace 120 and the second combustion furnace 130 are formed in a cylindrical shape.

  In the combustion apparatus 100 of the present invention, when the first combustion furnace 120 and the second combustion furnace 130 are formed in a cylindrical shape, a portion where ash and soot stay on the inner walls of the first combustion furnace 120 and the second combustion furnace 130 is present. And the collection rate of ash and straw can be increased.

F Flame 10 Wood pellet manufacturing plant 100 Combustion device 110 Pellet burner 111 Burner port 120 First combustion furnace 121 Ash recovery port 123 Combustion confirmation window 124 Refractory brick 130 Second combustion furnace 131 Ash recovery port 133 Combustion confirmation window 134 Combustion heat exhaust port 135 Fire brick 140 Connection pipe

Claims (3)

A combustion section having a combustion heat supply port for supplying combustion heat by burning combustion products;
A first combustion furnace for guiding the combustion heat supplied from the combustion heat supply port upward;
A second combustion furnace connected to the first combustion furnace by a connection pipe;
A combustion heat exhaust part provided at an intermediate part in the vertical direction of the second combustion furnace and exhausting the combustion heat from the second combustion furnace,
The combustion apparatus characterized in that the connection pipe connects a position above the combustion heat supply port of the first combustion furnace and a position above the combustion heat discharge part of the second combustion furnace. .   The combustion apparatus according to claim 1, wherein inner walls of the first combustion furnace and the second combustion furnace are formed of refractory bricks.   The combustion apparatus according to claim 1 or 2, wherein the first combustion furnace and the second combustion furnace are formed in a cylindrical shape.

Images