JPH06193844A - Dust supply device for fluidized-bed type waste refuse incinerator - Google Patents

Abstract

PURPOSE:To provide a dust supply device for a fluidized-bed type waste refuse incinerator in which constant flow supply properties of waste refuse os held satisfactorily while holding material sealability. CONSTITUTION:A dust supply device 14 for a fluidized-bed type waste incinerator comprises a hopper 24 for containing waste refuse 14 to be supplied to the incinerator, a trough 17 extended to an intake port 4 of a dust supply duct 2 of the incinerator from a lower part of the hopper 24 and connected to the port 4, and a screw 19 contained in the trough 17 to convey the waste 14 in the hopper 24 to the port 4. A dust supply device 16 for the incinerator is formed with a constant flow supply unit with an end side trough ceiling 25 connected to the port 4 formed sufficiently higher than the upper surface of the screw 19, with a sealing plate 27 extended obliquely downward or vertically to a screw root side in a throat 26 for connecting the ceiling 25 to the hopper 24 to be partitioned, and with a take-in member at an upper part of the screw root side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dusting apparatus for a fluidized bed type waste incinerator, and more particularly to a fluidizing apparatus capable of continuously and quantitatively supplying waste to the incinerator while maintaining a sealing property. The present invention relates to a dust supply device for a floor-type waste incinerator.

[0002]

2. Description of the Related Art Generally, a dusting apparatus for a fluidized bed waste incinerator supplies waste to the incinerator through a dust duct. This dust supply device needs to seal the inside in order to prevent exhaust gas in the incinerator from flowing back through the dust supply duct and inflow of excess air. Further, it is necessary to supply wastes quantitatively and continuously to the incinerator. Therefore, the above-mentioned dust supply device generally has a structure in which waste is stored in the hopper and material is sealed while the waste is sent to the duct by the screw conveyor.

A conventional dusting device for a fluidized bed waste incinerator will be described in detail below with reference to the accompanying drawings.

FIG. 3 shows the structure of the dust supply device 1 of the fluidized bed waste incinerator. As shown in FIG. 3, the dust supply apparatus 1 includes a hopper 3 for containing a waste material 14 to be supplied to the incinerator, and a lower portion of the hopper 3 which extends to an inlet 4 of a dust duct 2 of the incinerator. It comprises a trough 5 connected to the intake 4, and a screw 6 that conveys the waste material 14 contained in the trough 5 in the hopper 3 to the intake 4. A screw 6 is housed in the trough 5 with its tip facing the intake port 4 of the dust supply duct 2. An outer wall 7 is joined and closed at the rear end on the upstream side of the trough 5. A bearing 9 is provided at a central portion of the outer wall 7 so as to penetrate the wall, and a rotating shaft 8 of the screw 6 is provided.
Is supported by this bearing 9. A drive unit (not shown) is provided outside the trough 5, and a rotary shaft 8 is rotated to form a screw conveyor that swallows around the screw 6 and conveys it to the tip of the screw. is doing.

Also, on both top edges 10 and 11 of the trough 5,
The tip-side ceiling 12, the hopper 3, and the root-side ceiling 13 are joined in this order from the tip side, and the two ridges 10 and 11 have a blow-through at the hopper portion, and the other has an airtight ceiling.

The conventional dusting apparatus for fluidized bed type waste incinerator thus constructed can have material sealing property as follows. First, the waste 14 is the hopper 3
It is dropped on the upper chute and accumulated in the hopper 3 and the trough 5. Waste 1 accumulated in the hopper 3 in this way
When the upper surface level 15 of 4 is maintained at a predetermined height, gas is taken from the lower part of the hopper 3 by the screw 6 and conveyed under the ceiling 12 on the tip side to be compressed appropriately so that the gas is discharged. It becomes impassable and the material sealing property is maintained.

[0007]

However, in the conventional dust collector 1 of the fluidized bed type waste incinerator as described above,
Increasing the upper surface level 15 of the waste material 14 accumulated in the hopper 3 increases the waste load applied to the screw,
Although it is more compressed and swallowed, the material sealing property is improved, but when the waste 14 conveyed by the screw 6 passes through the throat that is the joint between the tip-side ceiling 12 and the hopper 3, the load from above disappears and the As it expands, it is pressed against the throat and the ceiling 12 on the tip side and receives a large frictional resistance. At this time, the waste material 14 repeats compression and expansion due to release under the compression limit condition, and the intake 4 from the throat.
However, there is a problem that the waste 14 up to this point is moved in a dense and dense state, and the quantitative supply ability cannot be maintained. Therefore, it is necessary to lower the upper surface level 15 to reduce the influence of expansion in order to maintain the quantitative supply property.
There is a problem in that the waste material 14 that is conveyed to the lower side and compressed becomes coarse at the upper portion, and the material sealing property cannot be maintained. Therefore, it is difficult to adjust the upper surface level 15, and it is difficult to maintain both the quantitative supply property and the material sealing property. Therefore, the dust supply device 1 of the conventional fluidized bed type waste incinerator is unstable in the material sealing property and the quantitative supply property of the waste, and it has been a problem to improve them.

[0008] Therefore, an object of the present invention is to solve the above problems and to provide a dusting apparatus for a fluidized bed type waste incinerator capable of maintaining a good quantitative supply of waste while maintaining a material sealing property. is there.

[0009]

In order to achieve the above object, the present invention provides a hopper for containing the waste to be supplied to a fluidized bed type waste incinerator, and a dust duct for the incinerator from the lower part of the hopper. Of a fluidized bed waste incinerator having a trough that extends to the intake of the trough and is connected to the intake, and a screw that is housed in the trough and that conveys the waste in the hopper to the intake In the device, a fixed quantity supply unit is formed in the lower part of the tip side trough ceiling connected to the intake,
The throat connecting the tip side trough ceiling and the hopper is provided with a seal plate extending obliquely downward or vertically to the screw root side to partition and form a swallowing portion on the screw root side upper part, and the tip side trough ceiling is described above. It is higher than the bottom edge of the seal plate.

[0010]

According to the above construction, the waste is accumulated in the hopper to a level higher than the lower end of the seal plate and is then conveyed into the trough through the swallowing section. After passing through the lower end of the seal plate, the waste is compressed from above. It expands because it disappears, but
Since the ceiling of the trough portion on the tip side has an expansion space that is sufficiently higher than the lower end of the seal plate, it can be transported smoothly without receiving frictional resistance from the ceiling, and the quantitative supply of waste can be improved. Also, if the upper surface level of the waste is maintained just above the lower end of the seal plate in the hopper, the gas becomes impassable at the place where the waste is compressed below the lower end of the seal plate and enters the fixed amount supply section. Since the material sealing property can be secured, the material sealing property becomes stable. Therefore, the material sealing property and the quantitative supply property of waste can be maintained at the same time.

[0011]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view showing an embodiment of a dusting device 16 for a fluidized bed waste incinerator according to the present invention. A tip of a trough 17 is airtightly connected to an intake port 4 of a dust supply duct 2 of the incinerator (not shown). This trough 17
Are horizontally supported by a support member 18 provided on a substantially horizontal base 36. Further, in the trough 17, a screw 19 driven by a drive unit provided outside the rear end side of the trough is horizontally provided with a rotating shaft 20 on the base side supported by a bearing 21 and a tip end facing the inlet 4. The trough 17 has a sufficient depth to accommodate the screw 19.
A hopper 24 is connected to the top edges 22 and 23 of the trough 17 in a blow-through manner at the root side, and the ceiling 2 is provided at the tip side from that.
5 are joined. The ceiling 25 on the front end side is formed sufficiently higher than the upper surface of the screw 19 to form a fixed amount supply section B. The ceiling 25 on the front end side and the hopper 24 form a throat portion 26 and are connected to each other. A seal plate 27 is provided on the throat portion 26 in such a manner that the upper end thereof is airtightly connected to the screw root side in a direction extending obliquely downward or vertically, and a swallowing portion A is formed on the screw root side upper portion. To be more specific, the angle is set to an appropriate angle for each actual facility from the relationship between the intake amount and the supply amount of waste, which will be described later, and the relationship with the material seal.

The screw 19 has a tapered tapered shaft portion 28 at the swallowing portion, and a constant diameter shaft portion 29 having a diameter substantially the same as the diameter of the tip of the tapered shaft portion 28 at the fixed amount supply portion. However, the screw pitch of the screw blades 30 is rough at the swallowing portion and fine at the fixed amount supply portion. However, as mentioned above, the constant diameter shaft portion 2
It is possible to form the diameter of 9 as the minimum diameter of the tapered shaft portion 28 of the swallowing portion so that the constant-volume supply portion has a larger carrying capacity than the swallowing portion.

Further, in the hopper 24 immediately above the seal plate 27, the waste 14 is always put on the seal plate 27.
Fixed type level sensor 3 that detects that the water has accumulated
1, and a movable level sensor 32 for controlling the level of the waste material 14 in the hopper 24 above the base of the screw 19 is slidably adjustable in a vertically long mounting frame. It is provided. Further, a chute 34 having a movable waste drop adjusting plate 33 is provided above the hopper 24. In addition, the waste is carried into the chute 34 at the entrance of the chute 34.
A carry-in conveyor 35 is provided which falls inside.

Next, the operation of this embodiment will be described.

According to the dust feeder 16 of the fluidized bed waste incinerator of this embodiment, the waste 14 is carried in by the carry-in conveyor 35 and falls into the chute 34, and the movable waste fall adjusting plate. The dropping place is adjusted to be substantially constant at 33, and is dropped, accumulated in the hopper 24 to a level higher than the lower end of the seal plate 27, compressed by the load, conveyed in the trough 17 through the swallowing portion, and fed to the fixed amount supply portion. Sent. After passing through the lower end of the seal plate 27, the waste 14 expands because the load from above disappears, but since the ceiling 25 on the front end side is sufficiently higher than the lower end of the seal plate 27, the waste 14 smoothly receives no frictional resistance from the ceiling 25. Will be transported. Therefore, the quantitative supply property of the waste 14 is improved. Further, if the upper surface level 15 of the waste is maintained just above the lower end of the seal plate 27, the waste 14 is compressed under the lower end of the seal plate 27 before entering the fixed amount supply section and becomes high density. The gas becomes impenetrable at that point, and the material sealing property can be secured. Therefore, it is possible to maintain good quantitative supply of waste while maintaining the material sealing property.

Further, by adjusting the falling state of the waste material 14 carried in by the carry-in conveyor 35 and falling into the chute 34 to a constant level by the movable waste material drop adjusting plate 33, the waste material upper surface level of the swallowing section is adjusted. Since the density of the waste material 14 can be made constant by adjusting so that the screw 19 is biased parallel to the upper surface of the screw 19 or slightly to the root side of the screw 19, the swallowing amount by the screw 19 can be stabilized, so that the quantitative supply property is improved. .

Further, since the screw 19 has the tapered tapered shaft portion 28 at the swallowing portion, the waste 14 can be swallowed not only from the root side but also from the entire swallowing portion, and a fixed amount. The supply part has a constant diameter shaft part 29 having a diameter substantially the same as the diameter of the tip of the tapered shaft part 28, and the screw blades 30 have a pitch smaller than that of the swallow part in the fixed amount supply part and Since it is formed so that the fixed-volume feeding section has a larger carrying capacity than the swallowing section, the swallowing section makes it easier to swallow waste due to the large pitch, and even if the swallowed amount re-expands in the fixed-quantity feeding section. Since it fits within the carrying capacity, the quantitative supply of waste becomes stable. Further, since the pitch is small in the constant quantity supply unit, the continuous supply property of waste is improved.

Further, since the hopper 24 immediately above the seal plate 27 is provided with the fixed type level sensor 31 for detecting that the waste 14 is always accumulated above the lower end of the seal plate 27, the sealing performance is improved. Information is obtained to confirm the reservation. Further, when the level of the upper surface of the waste in the fixed quantity supply unit falls below the level of this sensor, it is possible to output a warning alarm of waste exhaustion or a signal to supply the waste unconditionally. The fixed level sensor 31 is also used to set the movable level sensor at an optimum position as described below.

Further, since the movable level sensor 32 for controlling the level of waste to a constant level is provided in the hopper 24 on the upper side of the base of the screw 19, the carry-in conveyor 3
Inverter control or timer control of 5 makes it possible to maintain the upper surface level 15 of the waste in the swallowing portion, which has conventionally fluctuated during operation, at a constant level during operation, so that the density of swallowed waste becomes constant. Therefore, since the swallowed amount is constant, the quantitative supply of waste is improved. Further, the movable level sensor 32 can be arbitrarily adjusted in the vertical direction in a sliding manner within the mounting frame, and the setting level can be easily adjusted so that the upper surface level 15 which is kept constant as described above can be easily adjusted. Quantitative supply of substances can be optimized, and operability is improved. About this, referring to FIG.
This will be described in detail below in accordance with the actual driving of the vehicle.

As described above, in the conventional dust collector, when the upper surface level of the waste in the hopper rises to a certain level, the waste that has passed through the throat and expanded expands to the tip side ceiling. Due to the frictional resistance received from (indicated by P in FIG. 2), the quantitative supplyability was beginning to be unsatisfied. Also in the dust supply device 16 according to the present invention, as the upper surface level of the waste in the swallowing section is raised, the upper surface level of the waste in the fixed quantity supply section rises. However, according to the dust collector 16 of the present invention, even if the operation is performed at the upper surface level Ai of the waste material of the swallowing section such that the upper surface level of the waste material of the fixed quantity supply section side begins to reach P, the tip side trough ceiling Since 25 is sufficiently higher than P, it is sufficiently higher than the upper surface level Ao of the expanded waste on the side of the fixed quantity supply part, and therefore does not give frictional resistance to the waste, so that there is no deterioration in the fixed quantity supply performance. The quantitative supply performance is improved compared to the conventional dust supply device.

By the way, when the dust supply device 16 is operated in earnest, it is better to control the upper surface level of the waste in the swallowing part to a constant level so that the density of the waste becomes constant and the swallowing amount becomes constant. Therefore, it is desirable for quantitative supply, but
It is not always optimal to operate with the constant level set to the above level Ai. Because, when driving with the upper level of the waste in the swallowing section at the above level Ai,
This is because the waste that has expanded in the fixed quantity supply section expands beyond the carrying capacity of the screw 19, and the balance between the swallowing amount and the capacity of the constant quantity supply section is lost, and the fixed quantity supply performance deteriorates. Therefore, when the dust supply device 16 is operated in earnest, the upper surface level of the waste on the drinking side of the dust supply device 16 will be described below in consideration of the actual variation in each facility and the characteristics of the waste. The operation is performed with constant control below such a Bi level. That is, when the Bi level or higher is reached, the waste ends up over the upper ends of the screw blades 30 at the tip of the screw, and the swallowing amount becomes too large to balance.

First, as shown in FIG. 2, when the upper surface level of the waste in the swallowing portion is at a level D lower than that of the fixed sensor 31, the swallowing load is small and it becomes impossible to secure the quantitative supply. In addition, it is not suitable for operation because there is a great risk that the sealing performance will deteriorate. Therefore, the top level of waste in the swallowing section must have at least the height of the fixed level sensor 31. This fixed type level sensor 3
The level that passes 1 and is well balanced with the swallowed amount and that can be practically secured for quantitative supply is actually measured by performing a trial run using a movable level sensor, and the practical upper limit is set to B.
i can be decided. Further, the height of the movable level sensor 32 is slidably adjusted in consideration of the fluctuation, and
If the height of Ci is set slightly lower, the balance between the swallowing amount and the supply amount is always maintained, and the quantitative supply property can be secured. The movable level sensor 32 is kept at the height Ci, and an inverter system or a timer system (NOT H level n seconds operation, H
By controlling the carry-in conveyor 35 at (stop at level), the upper surface level of the waste in the swallowing section can be constantly controlled to the optimum level Ci.

The screw 19 in the hopper 24 is
Not only a series, but two or more series may be arranged in parallel.

[0025]

In summary, according to the present invention, the waste can be continuously and quantitatively supplied to the fluidized bed waste incinerator while maintaining the sealing property.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing levels of waste in the embodiment of FIG.

FIG. 3 is a view showing a dust supply device of a conventional fluidized bed waste incinerator.

[Explanation of symbols]

 2 Dust supply duct 4 Intake 14 Waste 16 Dust collector 17 Trough 19 Screw 24 Hopper 25 Tip trough ceiling 26 Throat 27 Seal plate 28 Tapered shaft 29 Fixed diameter shaft 30 Screw blade 31 Fixed type level sensor 32 Movable Level sensor 33 Waste drop adjusting plate 34 Chute A Swallowing part B Fixed amount supplying part

Claims (4)

[Claims] 1. A hopper for containing waste to be supplied to a fluidized bed waste incinerator, and a trough extending from a lower portion of the hopper to an inlet of a dust duct of the incinerator and connected to the inlet. In a dusting device of a fluidized bed type waste incinerator, which is provided in the trough and is provided with a screw for conveying the waste in the hopper to the intake, a tip side trough ceiling connected to the intake A fixed amount supply part is formed in the lower part, and a throat part connecting the tip side trough ceiling and the hopper is provided with a seal plate extending diagonally downward or vertically on the screw root side to partition it, and a swallowing part on the screw root side upper part. And the tip side trough ceiling is formed higher than the lower end of the seal plate. 2. A hopper directly above the seal plate has a fixed type level sensor for detecting that waste is always accumulated on the seal plate, and the hopper above the root side of the screw has waste. 2. The dust supply apparatus for a fluidized bed waste incinerator according to claim 1, further comprising a movable level sensor whose vertical position is adjustable to control the level of the above. 3. The screw has a tapered tapered shaft portion at a swallowing portion, and a constant diameter shaft portion having a diameter substantially the same as a diameter of a tip end of the tapered shaft portion at a fixed amount supply portion,
2. The fluidized bed waste according to claim 1, wherein the screw blade has a pitch smaller than that of the swallowing portion in the fixed amount feeding portion and has a larger transport capacity in the constant amount feeding portion than the swallowing portion. Dust supply device for incinerator. 4. A movable waste fall adjusting plate is provided in the chute above the hopper.
Dust supply device for the fluidized bed waste incinerator described.