JPS6026936B2 - wood chip combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved apparatus for burning compressed wood chips.

Water heaters such as boilers mainly boil water by transmitting heat from flame (gaseous combustion), and most of the radiant heat from fixed combustion is wasted.

Furthermore, during natural combustion of wood chips, both gaseous and solid combustion occur, and the proportion of gaseous combustion is small.

Conventional combustion equipment places wood chips, etc. on a rostrum with a grid-like air supply V groove on the entire surface and burns it by forcefully blowing air, but this type of combustion is similar to natural combustion. The proportion of gaseous combustion was small. Therefore, most of the heat for solid combustion was wasted, resulting in poor thermal efficiency. The present invention has been made in view of the above-mentioned conventional circumstances, and its purpose is to heat the supplied compressed wood chips to a high temperature using the heat of combustion and cause them to pyrolyze, thereby generating a large amount of generated gas and causing a flame. An object of the present invention is to provide a combustion device with excellent thermal efficiency by increasing the amount of heat generated.

The wood chip combustion device of the present invention is characterized in that a rostol is arranged in front of the outlet of a conveyor for transporting wood chips, and the rostol is inclined downward as it goes forward, and the upper part of the rostol is turned into a flat heating part. Forming the lower part of the rostle into a flat plate-like rostle portion having an air supply groove, and horizontally surrounding the rostle with a cover member having a front end, so as to thermally decompose the wood chips on the heating part. The heating part formed on the upper part of the roaster is flat and has no air supply groove.Therefore, the wood chips on the heating part are steamed at high temperature without being burned, resulting in heat dissipation. When decomposed, a large amount of generated gas is generated, and the gas becomes a flame.The wood chips that generated the generated gas are sequentially moved to the rostral part and burned as a solid.An example of the implementation of the present invention will be explained with reference to the drawings. A is a combustion device, a is a blast pipe, and b is a furnace.

The blast pipe a is a cylindrical body whose both ends are closed with cover plates a, a2, and one end thereof is fixed to the side wall of the furnace b via a flange 17, and is arranged horizontally. A hopper 1 for storing compressed wood chips and the like is formed on the end side of the blast pipe a, and a conveyor 2 is disposed inside the hopper 1.

The hopper 1 opens the upper surface of the air pipe a to provide a cylindrical entrance part, and fixes a partition plate a3 inside the air pipe a.
Further, the bottom portion is formed into a substantially V-shape.

The conveying machine 2 is a screw conveyor, and consists of a wheel feed pipe 3 horizontally connected to the lower opening of the partition plate a3 of the hopper 1, and a screw shaft 4 slidingly in contact with the inside of the pipe 3.

The wheel feed pipe 3 is curved so that its outlet side is higher,
The outlet part penetrates the cover plate a2 and the flange 17 and projects into the furnace b, and the cover member 5 is provided at the outlet part so as to be opened and closed.

The screw shaft 4 is rotatably supported by the cover plate a and the curved part of the transport pipe 3 via bearings, respectively, and has the end on the cover plate a protruding outward to fix the sprocket 6 and to fix the sprocket 6. , the other end penetrates the curved part of the transport pipe 3 and projects inward from the side wall of the furnace b, and a biased cam member 11 is attached to the projecting end.
to fix.

Further, it is connected to a board 7 provided at the bottom of the wheel feed pipe 3, and a blower 8, a drive motor 9, and a speed reducer 10 are provided on the board 7. The drive motor 9 is linked to a reducer 10' by a belt or the like, and the output shaft of the reducer 10 is linked to the sprocket 6 of the screw shaft 4 via a chain or the like, so that the rotation of the motor 9 is reduced by the reducer 10. The fuel is transmitted to the subrocket 6, and the screw shaft 4 is rotated to transfer the fuel from the hopper 1.

The blower 8 generates air by rotation of a connected blower motor 8', has an air outlet connected to the side surface of the air pipe a, and blows air into the air pipe a.

The solid roistle 13 is made of a heat-resistant cast material or the like, and includes a trapezoidal heating part 15 that widens toward the end and a rectangular rooster part 16 having a width equal to the base of the heating part 15 .

The heating section 15 of the solid lost throughput 3 is fixed to the lower side of the exit port of the transport pipe 3, and is formed with a slope so that it becomes lower as it gets further away from the exit closing part, and also becomes wider as it gets lower. There is. The roistle section 16 is formed to have a gentler slope than the heating section 15, and has a large number of air supply grooves 18 formed therein.

The movable rooster 14 is an elongated heat-resistant cast member with a rectangular cross section, and is supported by a guide rail 22 protruding along the lower edge of the solid rooster 13 so as to be freely movable.

Protrusions 16' and 16'' are provided on the upper surface of the movable roaster 14 and the side surface on the solid roaster 13 side, respectively, for scraping off the ash layer formed on the surface of the burning fuel.

Further, a recess is formed in the center of the lower surface of the movable rooster 14 in the longitudinal direction, and is engaged with a cam piece 24 fixed to one end of a drive shaft 23 rotatably disposed below the solid rooster 13. The base end of a swing village 27 that engages with the eccentric spinal cord 11' of the eccentric cam member 11 is fixed to the other end of the drive track 23, and the drive track 23 is rotated within a predetermined angle range by rotation of the screw shaft 4. The movable rotor 14 rotates and reciprocates in the horizontal direction.

A cylindrical member 12 surrounds the solid roistle 13, the movable rooster 14, the outlet of the ring feed pipe 3 protruding inward from the side wall of the furnace b, and the eccentric cam member 11 of the screw shaft 4.
is fixed to the flange 17 and protrudes horizontally. The cylindrical member 12 and the flange 17 surround the solid rooster 13, thereby dissipating the amount of heat from the compressed wood chips burning on the rooster 14, thereby heating the compressed wood chips supplied to the heating section 15. It is designed to be disassembled.

Furthermore, there are secondary air vents 25 on the left and right near the exit of the transport pipe 3.
A primary air outlet 26 is bored below it,
The air pipe a and the inside of the cylindrical member 12 are made to fit each other.

Each of the air blowing ports 25 and 26 is provided with a lid plate that can be opened and closed, and the amount of air blown can be adjusted by adjusting the degree of opening.

The primary air outlet 26 is closed at the lower side of the solid roistle 13 and supplies combustion air from the air pipe a through the air supply groove 18 of the roistle part 14 from the lower side of the solid roistle 13. There is.

The secondary air outlet 26 opens above the solid rooster 13,
The air from the blast pipe a is blown to the upper side of the roistle to aid combustion and to blow out the flame horizontally.

When the conveyor 2 is operated, the compressed wood chips in the hopper 1 are moved through the circular feed pipe 3, and the lid member provided at the outlet is oscillated to close the outlet, and the solid lost throughput is removed. 3
As well as being discharged to the top, the heating section 15 of the fixed rooster 13
It descends along the line and reaches the rostle section 16.

Simultaneously with the movement of the conveyor 2, the blower 8 is moved, the primary and secondary air supply ports 25 and 26 are opened, and the compressed wood chips on the roistle section 16 are ignited.

The wood chips in the roistle part 16 are supplied with air from the air supply groove and move to the movable roostle 14 while burning, and the ash layer formed on the outer surface is scraped off by the reciprocating motion of the movable roostle 14, and the wood chips are completely burned. The heat generated by the combustion flows into the cylindrical member 12, heats and pyrolyzes the wood chips on the heating part 15, and generates a large amount of generated gas, which is combusted and emitted as flame.

Furthermore, even if the conveyor 2 is stopped, the fuel in the early stage of combustion remains as a embers in the vicinity of the rooster section 16 of the heating section 15 of the solid roaster 13, and is automatically re-burned when the conveyor 2 is restarted.

As described above, the present invention provides a roistle which is inclined backward downward as it reaches the front of the outlet of a conveyor for transporting wood chips, the upper part of the roistle is used as a flat heating part, and the lower part of the roistle is used as an air supply groove. The wood chip combustion device is configured such that the rostol is formed into a flat plate-like rostol portion with Above the heating section, there is a heat storage space surrounded by a conveyor at the back, a covering material around it, and flames at the front.

Since there is no air supply V-groove in the heating section, the wood chips on the heating section are heated, steamed, and pyrolyzed.

Then, a large amount of gas is generated. The above-mentioned large amount of produced gas is released as a flame, and compared to a secondary combustion device, more of the produced gas is combusted as produced gas, improving thermal efficiency.

Therefore, a large amount of heat can be obtained even with a type 4 combustion device.

Furthermore, the thermal decomposition of compressed wood chips reduces the generation of ash and exudate, which has the effect of suppressing the generation of clinker and prevents deterioration of combustion efficiency.

Furthermore, since the solid combustion is performed on the rostral part at the frontmost part of the combustion device, the heat is directly radiated, which is more efficient than if the solid combustion is performed at the back of the combustion device. Thus, achieving the intended purpose.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of the wood chip combustion apparatus of the present invention, and FIG. 2 is a cross-sectional perspective view of the main parts. In the figure, 2...Transfer machine, 12...Cylindrical member, 13...Fixed roaster, 14...Moveable roaster, 15...Heating Part, 16...
・Rostle part, 17...Flange. 〆′ Chi' Domi

Claims (1)

[Claims] 1. In front of the exit of the conveyor for transporting wood chips, a rostol is provided that slopes downward as it approaches the front, the upper part of the rostol is equipped with a flat heating part, and the lower part of the rostol is equipped with an air supply groove. In addition to forming a flat plate-shaped rostle part,
A wood chip combustion device in which the rostol is horizontally surrounded by a cover member having an open front, and the wood chips on the heating section are thermally decomposed by heating.