JPH0243964B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention particularly relates to a combustion furnace that can effectively burn processed fuel made by processing waste materials such as wood bark and wood ends.

Prior Art Conventional combustion paths are generally constructed in such a way that the processed fuel is sequentially added to the processed fuel being combusted on the combustion shelf and then combusted. Since the burnt scum from the burnt gas would fill up this space, the combustion efficiency deteriorated, and it was also inconvenient to remove the burnt dregs.

In order to eliminate such inconveniences, the inventor of the present invention first continuously supplies the above-mentioned processed fuel from the hopper via the fuel feeding device along the combustion shelf surface of the combustion furnace, and the burnt residue is removed from the above-mentioned The ash is pushed down by the processed fuel supplied in this way and falls into the ash trap area one by one, and the ventilation holes of the above-mentioned combustion shelf are not blocked by ash and fresh air is always supplied from the air intake chamber to the combustion furnace. At the same time, on the fuel supply side of the furnace body, an air passage with a vent hole at the top for blowing secondary air is formed using a partition plate, and from this air passage is formed in the combustion chamber by dry distillation. Sufficient air is supplied to the generated flammable gas to ensure complete combustion, and when the combustion furnace is shut down, embers on the combustion shelf will ignite the processed fuel remaining in the fuel feeder. However, in order to prevent the risk of the fire spreading to the combustion inside the hopper and causing a fire, a special application was made for a combustion furnace in which the fuel feed device installed at the bottom of the hopper was configured with screw conveyors arranged at different levels above and below. The application was filed as No. 123856 in 1958. However, as a result of implementing the above invention, the flame retardant substances contained in the processed fuel solidified as non-combustible substances on the combustion shelf surface during combustion, forming clinker, which caused holes in the combustion shelf. Moreover, since the clinker is not removed by the extrusion force of processed fuel sent to the combustion shelf surface by the combustion feed device, processed fuel accumulates near the combustion shelf entrance, and the combustion shelf It has been discovered that the amount of air supplied from the vents on the surface also decreases, resulting in insufficient combustion of processed fuel in the combustion furnace.

Problems to be Solved by the Invention The present inventor has discovered that in order to prevent the formation of clinker, the flame retardant substances mixed in the fuel can be completely combusted by supplying sufficient air to the burning fuel. Focusing on the fact that as a result, the formation of clinker described above can be prevented, the invention has been improved to prevent the formation of clinker due to burnt residue on the combustion shelf surface, and to promote the combustion of fuel in the combustion chamber. In order to supply secondary air to the combustion chamber, an air passage branched from the blower passage is provided, and an air return passage is connected to the shoot side of the fuel feeder installed adjacent to the outside of the combustion furnace at appropriate locations in this air passage. and configured to guide excess secondary air supplied to the combustion chamber from the air passage to the shooter side,
It is possible to supply sufficient air necessary for the combustion chamber to the combustion shelf of the combustion chamber of the combustion furnace.

Means for solving the problem: Screw conveyors are arranged in two different stages, upper 2A and lower 2B, at the processed fuel outlet of hopper 1 via chute 8, and screw conveyors 2A and 2B of each stage are forced to operate, respectively. A fuel supply section in which a fuel feed device 2 comprising a motor 10 for driving is disposed, and adjacent to this, a vent hole 5 is provided in the lower part of the fuel supply section, which is directly connected to the blower 9 via an air passage 13. The air intake chamber 4 has a combustion shelf 6 as a ceiling plate, and a burnt scum ash trap 7 is disposed on the opposite side of the air intake chamber where the air passage is formed and on the opposite side of the screw conveyor exit. An air passage branched from the secondary air vent of the air intake chamber 4 is connected to the upper part of the intake chamber 4 and the burnt ash falling section 7 toward the fuel supply section.
A combustion section consisting of a combustion chamber defined by a partition plate with air injection holes 14 is disposed, and the outlet of the lower screw conveyor 2B constituting the fuel feeding device 2 disposed in the fuel supply section is arranged. The air return passage 16 is arranged so as to pass through the partition plate 17 and look into the surface of the combustion shelf 6 of the combustion chamber. It is made up of

Embodiment Since the present invention is constructed as described above, in order to operate the combustion apparatus according to the present invention, the motor 10 is first rotated, and the rotation is transmitted to the screw conveyors 2A and 2B arranged in upper and lower stages. Processing fuel put into the hopper 1 is first scraped out by a screw conveyor 2A disposed on the upper stage of the fuel feeding device 2, and then sent to a chute 8 disposed at the tip and dropped from the chute 8. Processed fuel falling from the chute 8 is pushed out toward the combustion shelf 6 of the combustion chamber 11 of the combustion section 3 by a screw conveyor 2B disposed at the lower stage of the fuel feeding device 2. When the processed fuel pushed out onto the combustion shelf 6 accumulates on the combustion shelf 6, this processed fuel is ignited. At this time,
Air is blown from an air passage 13 by a blower 9 into an air intake chamber 4 provided in the lower part of the combustion section 3 . The air supplied from the air intake chamber 4 is
Combustion shelf 6 formed by drilling ventilation holes 5 in the ceiling board of
The processed fuel will be combusted through ventilation into the combustion chamber 11.

This combustion processing fuel is sequentially replenished with processing fuel from the hopper 1 on a screw conveyor and is combusted. If the combustion chamber is filled with dry distilled combustible gas due to this combustion, the combustion may be inhibited. A passage 15 is formed into which secondary air flows from the atrium from the air intake chamber;
The air flowing into the air passage 15 is injected into the combustion chamber 11 from the air injection hole 14 formed in the partition plate, and burns the dry distilled combustible gas generated in the upper part of the fuel chamber 11. is discharged from.

As mentioned above, the fuel feed device 2 has a two-stage structure because when the operation is stopped, the processed fuel remaining in the fuel feed device is ignited from the embers on the combustion shelf 6, and this becomes processed fuel in the hopper. This is to prevent the fire from spreading and causing a fire.

When the vent hole 5 is blocked by the burnt residue of processed fuel burned on the fuel shelf 6 surface, it becomes difficult for the air supplied by the blower 9 to flow into the air intake chamber 4. Because of this structure, the fuel is sent horizontally from the screw conveyor 2B arranged at the lower stage of the fuel sending device 2 sequentially over the 6 surfaces of the combustion shelves, so that the burnt residue is sent anew one after another. Since the processed fuel moves in the direction of the ash trap 7 and is pushed out, the above-mentioned inconvenience can be avoided for the time being. However, in spite of this, the flame retardant substances contained in the processed fuel may solidify as non-combustible substances on the combustion shelf 6 surface during combustion, causing a clinker phenomenon, which prevents the complete removal of clinker. This cannot be done, and the generated clinker blocks the ventilation hole 5 of the combustion shelf 6, which impedes the complete combustion of the newly fed processed fuel.

The emphasis of the present invention is to prevent the generation of clinker due to incomplete combustion of this processed fuel. This point will be explained in detail next. By operating this device, air from the blower 9 is sent to the air intake chamber 4 through the air passage 13, and this air is sent to the combustion shelf 6.
A part of the air flows out from the ventilation hole 5 into the combustion chamber 11, but a portion is sent to an air passage 15 arranged along the outer wall surface of the combustion chamber 11 with a partition plate 17, and is sent to the upper part of the partition plate 17 on the outer side of the combustion chamber. It is injected into the combustion chamber 11 from the drilled nozzle hole 14 to burn the carbonized combustible gas produced by combustion of the processed fuel, and the surplus air of this injected air forms the air passage 15 and the fuel feed device 2. An air return passage 16 communicates between the chute 8 and the fuel feed device 2
The fuel is re-sent to the combustion shelf 6 together with the processed fuel through the screw conveyor 2B arranged at the lower stage of the combustion chamber, so that sufficient air is supplied and complete combustion can be carried out.

Effect: As a result, sufficient air is supplied to the processed fuel burning on the 6 surfaces of the combustion shelf, promoting complete combustion and preventing incomplete combustion due to the clinker. Due to the supply of air, air is always supplied from the air passage 15.
The air is circulated through the return passage to the combustion chamber 11.
Since the flow is from the combustion chamber 11 to the hopper 1
It also prevents smoke from flowing back into the room. In the example described in this explanation, a square-shaped combustion furnace etc. is illustrated, but
It is possible to arbitrarily select a cylindrical combustion furnace or an air passage.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional diagram of the present invention. FIG. 2 is a sectional view taken along line A--A in FIG. 1. 1...Hopper, 2...Fuel feed device, 2A...
...Upper screw conveyor, 2B...Lower screw conveyor, 3...Combustion furnace, 4...Air intake chamber, 6...Combustion shelf, 7...Ashes trap, 8...Chute, 9...Blower, 10... Drive motor, 1
DESCRIPTION OF SYMBOLS 1... Combustion chamber, 12... Smoke stack, 13... Air duct, 14... Nozzle hole, 15... Air passage, 16...
Air return passage, 17...partition plate.

Claims (1)

[Claims] 1 Screw conveyors are arranged in two different stages, upper 2A and lower 2B, at the processing fuel outlet of the hopper 1 via a chute 8, and a motor 10 for forcibly driving the screw conveyors 2A and 2B in each stage. A fuel supply section in which a fuel feed device 2 comprising a fuel supply device 2 is disposed, and adjacent to the fuel supply section, a combustion shelf 6 having a ventilation hole 5 and directly communicating with the blower 9 via an air passage 13 in the lower part thereof. The air intake chamber 4 has a ceiling plate, and a burnt scum ash trap 7 is disposed on the opposite side of the air intake chamber from which the air passage is formed, and on the opposite side of the screw conveyor exit.
In the upper part of the burnt ash falling part 7, on the fuel supply part side, there is a combustion chamber in which an air passage branched from the secondary air blowing part of the air intake chamber 4 is partitioned by a partition plate with air injection holes 14. A combustion section consisting of The combustion apparatus is characterized in that the air return passage 16 is disposed so that the air passage 15 is in direct alignment with the air return passage 15, and the air return passage 16 communicates with the chute 8 disposed in the fuel feeding device 2.