JPH11201640A - Refuse drying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent adhesion and build-up of combustible refuse in a rotary kiln and to suppress ignition owing to adhesion and build-up of combustible refuse. SOLUTION: In a refuse drying device in which an agitating device 6 is arranged in a rotary kiln 2 of a drying chamber 1, an agitating shaft 61 of an agitating device 6 is positioned below the axis of the rotary kiln 2 and deviated to the refuse scrape-up side due to rotation of the rotary kiln 2. An agitation paddle 62 arranged on an agitation shaft 61 of the agitating device 6 comprises a base end paddle 62a having a top part formed in a tapering-off state; and a tip paddle 62b extending in a refuse feed direction at the tip of the base end paddle 62a and the rotary kiln 2. A built-up substance discharge means 20 to discharge a built-up substance is arranged at the lower end of a hood 4 arranged on the refuse charge side of the rotary kiln 2. When combustible refuse is ignited in the rotary kiln 2, a flame-detecting device 30 to detect the flame thereof is provided and a fire extinguishing nozzle 32 is provided to sprinkle water in the rotary kiln 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste drying apparatus for drying combustible waste.

[0002]

2. Description of the Related Art As a conventional waste drying apparatus, a waste drying apparatus shown in FIG. 4 will be described as an example.

In FIG. 4, reference numeral 1 denotes a drying chamber for drying combustible waste. The drying chamber 1 is provided so as to cover, for example, a rotary kiln 2 which is an inner cylinder and an intermediate portion excluding both ends of the rotary kiln 2. The outer cylinder 3 has a double structure.

[0004] The rotary kiln 2 is a cylindrical one rotatably supported about its axis by a driving device (not shown).
a is formed, and a dust discharge port 2b is formed on the other side. The dust discharge port 2b is supported so as to be slightly inclined downward from the dust receiving port 2a to the dust discharge port 2b.

[0005] An entrance hood 4 and a waste supply device 5 are connected to the waste receiving port 2a.

The refuse supply device 5 supplies a fixed amount of combustible waste to the rotary kiln 2. For example, the refuse supply device 5 removes combustible waste carried out from a refuse storage chamber (not shown) by a screw feeder 5.
The liquid is supplied into the rotary kiln 2 by a. The combustible waste carried into the waste supply device 5 is crushed in advance by a crusher (not shown).

Further, a stirrer 6 for stirring the combustible waste in the rotary kiln 2 is provided in the rotary kiln 2.

An outlet hood 7 is connected to the dust outlet 2b, and a dust discharging device 8 is connected to a lower end of the outlet hood 7.

[0009] The refuse discharging device 8 feeds the dried refuse discharged from the refuse discharge port 2b to a screw feeder 8a.
To discharge to the outside.

The upper end of the outlet hood 7 is connected to a transport pipe 9
The upper end of the cyclone 10 communicates with the transport pipe 11 and the fan 12
Through the combustor 13.

The cyclone 10 removes dust and the like contained in the air sucked from the inside of the rotary kiln 2 by the fan 12, and a lower discharge port for discharging the removed dust is connected to an intermediate portion of the dust discharge device 8. Have been.

The combustor 13 has a burner 13a, and has a function of introducing air removed by the cyclone 10 through the transport pipe 11 by the fan 12 and heating it at a high temperature to deodorize the air.

The discharge side of the combustor 13 is communicated with the outer cylinder 3 of the drying chamber 1 and introduces high-temperature deodorized air into the outer cylinder 3 to indirectly burn combustible waste in the rotary kiln 2. dry.

Further, a discharge port 3a is formed in the outer cylinder 3, and high-temperature air in the outer cylinder 3 is discharged from the discharge port 3a through the discharge pipe 14, the heat exchanger 15, and the exhaust fan 16 to the outside air. Released.

The heat exchanger 15 exchanges heat between the high-temperature air discharged from the outer cylinder 3 and the outside air to raise the temperature, and then introduces the outside air into the rotary kiln 2 through the inlet hood 4. doing. Since the outside air introduced into the rotary kiln 2 is heated by the heat exchanger 15 as described above, the combustible waste in the rotary kiln 2 is directly dried.

Accordingly, in the drying chamber 1, the combustible waste in the rotary kiln 2 is dried indirectly from the outside through the outer cylinder 3 and directly from the inside.

Next, an operation of drying the combustible waste by the waste drying apparatus having the above-described structure will be described.

The combustible refuse supplied to the rotary kiln 2 by the refuse supply device 5 is stirred by the agitating device 6 and heated inside the rotary kiln 2 by the heated outside air introduced from the heat exchanger 15 through the inlet hood 4. Then, the combustible waste is brought into contact with the combustible waste to remove moisture in the combustible waste and to be dried.

The outside air from which moisture has been removed from the combustible waste is passed through an outlet hood 7 and is then dedusted by a cyclone 10 before being sent to a combustor 13 by a fan 12. The inside of the combustor 13 is maintained at about 750 ° C. or higher by a burner 13a, and the combustor 13 deodorizes the odor in the outside air, and the deodorized outside air enters the outer cylinder 3 together with the combustion gas of the liquid fuel by the combustion of the burner 13a. The introduced rotary kiln 2 is heated from the outside, the combustible waste in the rotary kiln 2 is indirectly dried, and the outside air is heated by the heat exchanger 15 and then exhausted by the exhaust fan 16.

The combustible waste sequentially supplied from the waste supply device 5 is dried directly and indirectly in the rotary kiln 2 and discharged from the waste discharge device 8.

Here, the inside of the rotary kiln 2 and the stirring device 6 are configured as shown in FIGS. 5 (a) and 5 (b).

The stirring device 6 comprises a stirring shaft 6a rotatably supported in the rotary kiln 2, and two types of stirring paddles 6b and 6c provided on the stirring shaft 6a.

One of the stirring paddles 6b is attached to the rotary kiln 2 near the dust input side, and has a T-shape. The length of the stirring paddle 6b is set to be a length that is approximately 20 mm to 50 mm between the inner wall of the rotary kiln 2 and the stirring paddle 6b destroys relatively massive combustible waste.

The other stirring paddle 6c is mounted on the rotary kiln 2 near the dust discharge side, and has a cross-girder shape. The length of the stirring paddle 6c is about 20 mm to 50 mm from the tip of the lifter 2c attached to the inner wall of the rotary kiln 2 so as to face the stirring paddle 6c.
It is set to a length that provides a gap of the order. Stirring paddle 6
The combustible waste destroyed by the stirring paddle 6b is stirred by the lifter 2c and the lifter 2c.

The rotary kiln 2 and the stirring device 6 are rotating counterclockwise in FIG. 5B.

The lifter 2c removes combustible waste in the rotary kiln 2 with the rotation of the rotary kiln 2 by a stirring shaft 6a.
The combustible waste that has been lifted upward then falls downward by its own weight.

[0027]

However, in the refuse drying apparatus constructed as described above, since the crushed combustible waste includes a string-like material, the string-like material is used as a stirring paddle. There is a problem that the cord-like material easily wound around 6b and 6c and spontaneously ignites when the cord-like material wound in this manner is heated in the rotary kiln 2 for a long time.

In addition, since combustible waste contains a vinyl piece having a relatively low softening point, if a protruding material such as a lifter 2c is provided inside the rotary kiln 2, the vinyl piece or the like may be rotated at a high temperature. Inner wall of kiln 2, especially lifter 2c
There is a phenomenon in which burnt garbage adheres to the softened pieces of vinyl, and grows in a layered manner. This phenomenon is due to the fact that the deposit acts in the same manner as the heat insulating material, lowering the heat transfer efficiency from the outer cylinder 3 into the rotary kiln 2, lowering the drying efficiency and, at the inner wall contact surface of the rotary kiln 2, When the heat from the heat accumulates and becomes scorched and peels off for some reason, there is a problem that it comes into contact with oxygen in the air in the rotary kiln 2 and ignites.

Further, when the combustible waste put into the rotary kiln 2 is stirred by the stirring paddle 6b,
Depending on the contact position with the agitating paddle 6b, there is a problem that it is flipped back to the charging side, deposits at the lower part of the inlet hood 4, and the combustible waste deposited there is heated for a long period of time, causing ignition. Was.

Although a discharge port 4a for discharging the deposited sediment (combustible waste) is provided at the lower part of the inlet hood 4, the discharge port 4a is openable and closable.
When a is opened, the heated air from the heat exchanger 15 introduced into the inlet hood 4 is discharged from the outlet 4a, which is dangerous, so that the accumulated deposits cannot be removed during the operation. There was a fire problem.

As a measure against the conventional ignition,
The outlet temperature of the rotary kiln 2 is measured by an outlet temperature detector 17, and when the outlet temperature reaches a certain temperature or higher, it is considered that a fire has occurred inside the inlet hood 4 and the rotary kiln 2,
The fire was extinguished by a fire extinguishing nozzle 18 installed above the outlet hood 7.

However, in such a countermeasure against ignition, it takes time from the ignition inside the entrance hood 4 and the rotary kiln 2 to the detection, and when the detection is performed, the combustible waste inside the rotary kiln 2 is completely burned. However, there was a problem that it could not be used as garbage fuel. Also, even if the worker or the like immediately detects the ignition, the combustible waste that has ignited is transported to the outlet hood 7 while burning, without being sprayed into the rotary kiln 2. Since the fire is extinguished, there is a problem that not only is it not usable as refuse fuel as described above, but also there is a high risk of heat damage to each device.

[0033]

According to a first aspect of the present invention, there is provided a refuse drying apparatus provided with a stirrer for stirring the combustible waste in a drying chamber for drying the combustible waste. Is disposed below the axis of the drying chamber.

The refuse drying apparatus according to the second aspect of the present invention comprises:
In a refuse drying apparatus provided with a stirrer for stirring the combustible waste in a drying chamber for drying the combustible waste, the stirring shaft of the stirrer is located below the axis of the drying chamber, and the refuse caused by rotation of the drying chamber. It is biased to the scraping side.

According to the third aspect of the present invention, there is provided a refuse drying apparatus,
A stirring paddle provided on a stirring shaft of the stirring device has a base end connected to the stirring shaft, a base paddle having a tapered tip, and a drying pad in the drying chamber at the tip of the base paddle. And a tip paddle extending in the garbage feeding direction.

The refuse drying apparatus according to claim 4 of the present invention is
In a refuse drying apparatus provided with a stirrer for stirring the combustible waste in a drying chamber for drying the combustible waste, a hood is provided on the combustible waste input side of the drying chamber, and a hood is provided at a lower end of the hood at a lower end of the hood. A deposit discharging means capable of discharging the deposited deposit at any time is provided.

The refuse drying apparatus according to claim 5 of the present invention comprises:
In a refuse drying apparatus provided with a stirrer for stirring the combustible waste in a drying chamber for drying the combustible waste, a flame detection device for detecting a flame when the combustible waste is ignited in the drying chamber is provided, and drying is performed. It is equipped with a fire extinguishing nozzle that sprays water into the room.

[0038]

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

FIG. 1 shows the overall configuration of the refuse drying apparatus of the present invention, and FIGS. 2 (a) and 2 (b) show the configuration of a stirring device provided in a rotary kiln of the refuse drying apparatus. .

The members having the same configuration as those of the refuse drying apparatus described in the related art are denoted by the same reference numerals, and description thereof is omitted.

This waste drying apparatus is provided with a deposit discharging means 20 for discharging deposits (combustible waste) deposited on the lower end of the entrance hood 4.

The deposit discharging means 20 includes a screw conveyor 21, a slide damper 23 and a storage box 24 connected to the lower end of the entrance hood 4, and the deposits are deposited at the lower end of the entrance hood 4 by the screw conveyor 21. The deposit is appropriately discharged from the discharge port 22 to the storage box 24. By discharging the sediment using the screw conveyor 21 as described above, the inside of the entrance hood 4 and the storage box 2 are discharged.
4, the heated air in the inlet hood 4 does not escape through the screw conveyor 21. Therefore, the deposits deposited on the inlet hood 4 by the screw conveyor 21 can be discharged from the high-temperature inlet hood 4 to the room temperature storage box 24 at any time.

A flame detection device 30 is provided above the entrance hood 4 for detecting a flame when combustible waste is ignited in the entrance hood 4 or the rotary kiln 2.

The inlet hood 4 is provided with a fire extinguishing nozzle 31 for spraying water inside the inlet hood 4 and a fire extinguishing nozzle 32 for spraying water into the rotary kiln 2. The hood 7 is provided with a fire extinguishing nozzle 33 for spraying water toward the inside of the rotary kiln 2. Based on a detection signal from the flame detecting device 30, a fire extinguishing valve (not shown) is opened to discharge water from a water storage tank (not shown) or the like. By supplying the fire extinguishing nozzles 31, 32, 33, combustible waste is extinguished.

Further, as shown in FIGS. 2A and 2B, the stirring shaft 61 of the stirring device 6 provided inside the rotary kiln 2 is below the axis of the rotary kiln 2 and The rotary kiln 2 is rotatably supported at a position deviated to the side where dust is picked up by the rotation of the rotary kiln 2, and a plurality of stirring paddles 62 are provided on the stirring shaft 61 arranged as described above.

Each stirring paddle 62 is composed of a base paddle 62a formed in a triangular thin plate as shown in FIG. 3, and a front paddle 62b connected to the front end of the base paddle 62a. I have.

The proximal end paddle 62a has a proximal end connected to the stirring shaft 61 (see FIGS. 2A and 2B), and the distal end paddle 62b is provided at a gradually tapered distal end. .

The distal paddle 62b is formed in a trapezoidal thin plate, extends from the distal end of the base paddle 62a in the dust feeding direction in the rotary kiln 2, and is formed in an L-shape as a whole. I have.

Next, the operation of drying the combustible waste by the waste drying apparatus thus constructed will be described.

First, the combustible waste is supplied from the waste supply device 5 into the rotary kiln 2 and dried in the rotary kiln 2 in the same manner as described in the prior art, and the waste discharge device 8 is used.
Is discharged by. The dried refuse thus dried is produced as refuse fuel in a later step.

At this time, since the stirring paddle 62 is tapered in the rotary kiln 2 as described above, the winding of combustible waste (especially string-like material) around the stirring paddle 62 can be prevented as much as possible. Since the shaft 61 is located below the axis of the rotary kiln 2 and is biased toward the side where the rotary kiln 2 rotates, the combustible waste deposited on the bottom of the rotary kiln 2 is scraped by the stirring paddle 62. In addition to improving the drying efficiency, the combustible waste that tends to adhere to the inner wall of the rotary kiln 2 can be forcibly peeled off, and ignition due to the adhesion and deposition of these combustible wastes can be suppressed.

Even when combustible waste thrown into the rotary kiln 2 from the waste supply device 5 falls into the inlet hood 4, the combustible waste is discharged to the storage box 24 by the screw conveyor 21 at any time. Without doing
It is possible to suppress ignition due to the accumulation of combustible waste.

Further, when combustible waste is ignited in the rotary kiln 2, the flame due to the ignition of the combustible waste is detected by the flame detection device 30, and the flame detection signal causes the fire extinguishing nozzles 31, 32, 33 to enter the entrance hood. Water is sprayed into the kiln 4 and the rotary kiln 2 to extinguish combustible waste that has ignited. Therefore, the combustible waste that has ignited can be extinguished at an early stage, and burnout of the waste to be used as fuel can be minimized.

In the present embodiment, the drying chamber 1 has a double structure including the rotary kiln 2 and the outer cylinder 3, but the drying chamber 1 is not limited to the double structure.

It is also possible to use a combination of the outlet temperature detector 17 and the fire extinguishing nozzle 18 described in the section of the problem (see FIG. 4).

[0056]

As described above, according to the present invention, by disposing the stirring shaft of the stirring device below the axis of the drying chamber, the stirring paddle provided on the stirring shaft allows the stirring shaft to be provided at the bottom of the drying chamber. The accumulated combustible waste can be scraped up to improve the drying efficiency.

Further, since the agitating shaft of the agitating device is displaced below the axis of the drying chamber and toward the side where the garbage is scraped up by the rotation of the drying chamber, the combustible garbage that tends to adhere to the inner wall of the drying chamber. Can be forcibly peeled off, and ignition due to the adhesion and deposition of these combustible wastes can be suppressed.

Further, a stirring paddle is provided with a base end connected to a stirring shaft and having a tapered end formed at the base end, and extended at the end of the base end paddle and in a dust feeding direction in the drying chamber. Since it is composed of the tip paddle thus set, the winding of combustible waste (especially a string-like material) around the stirring paddle can be prevented as much as possible, and the ignition of the wound combustible waste can be prevented.

Further, the lower end of the hood provided on the combustible waste input side of the drying chamber is provided with a sediment discharging means capable of discharging the sediment deposited on the lower end of the hood at any time. Even when the combustible waste falls into the hood, the flammable waste is discharged to the outside without accumulating on the hood, so that ignition due to the accumulation of combustible waste at the lower end of the hood can be suppressed.

Further, a flame detecting device for detecting the flame when combustible waste is ignited in the drying chamber is provided.
By providing a fire extinguishing nozzle that sprays water into the drying chamber, if combustible waste is ignited in the drying chamber, the flame detector detects the flame due to the ignition of this combustible waste, and the fire detecting nozzle sends the fire from the fire extinguishing nozzle to the drying chamber based on the flame detection signal. Since the combustible waste that has been ignited by watering is extinguished, the combustible waste that has ignited can be extinguished at an early stage, and the burning of refuse to be used as fuel can be minimized.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a schematic overall configuration of a refuse drying apparatus of the present invention.

FIG. 2 shows a stirring device disposed in a rotary kiln in the refuse drying device of the present invention, wherein (a) is a cross-sectional view in a side view,
(B) is AA sectional drawing of (a).

FIG. 3 is a perspective view showing a configuration of a stirring paddle.

FIG. 4 is a configuration diagram showing a schematic overall configuration of a conventional refuse drying apparatus.

FIG. 5 shows a stirring device arranged in a rotary kiln in a conventional refuse drying device, where (a) is a cross-sectional view in a side view,
(B) is BB sectional drawing of (a).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drying room 2 Rotary kiln 4 Inlet hood (hood) 6 Stirrer 20 Sediment discharge means 30 Flame detector 32 Fire extinguishing nozzle 61 Stirrer shaft 62 Stirring paddle 62a Base paddle 62b Tip paddle

Continuation of the front page (72) Inventor Toru Hojo 6-107 Takino-cho, Nishinomiya-shi, Hyogo Shin-Meiwa Industry Co., Ltd. (72) Inventor Hisanori Kojima 6-107 Takino-cho, Nishinomiya-shi, Hyogo Pref. Shin-Meiwa Industrial Co., Ltd.

Claims (5)

[Claims] 1. A waste drying apparatus provided with a stirrer for stirring the combustible waste in a drying chamber for drying the combustible waste, wherein a stirring shaft of the stirrer is disposed below an axis of the drying chamber. A garbage drying device. 2. A refuse drying apparatus provided with a stirrer for stirring the combustible waste in a drying chamber for drying the combustible waste, wherein the stirring shaft of the stirrer is located below the axis of the drying chamber and the drying is performed. A garbage drying device characterized in that the garbage drying device is biased toward a garbage scraping side by rotation of the chamber. 3. A stirring paddle provided on a stirring shaft of the stirring device, a base paddle having a base end connected to the stirring shaft and having a tapered tip end, and a tip end of the base paddle. 3. The refuse drying apparatus according to claim 1, further comprising a tip paddle extending in a refuse feeding direction in the drying chamber. 4. A refuse drying apparatus provided with a stirrer for stirring the combustible waste in a drying chamber for drying the combustible waste, wherein a hood is provided on the combustible waste input side of the drying chamber, and the hood is provided at a lower end of the hood. A refuse drying device, comprising: a deposit discharging means capable of discharging the deposited material at the lower end of the hood at any time. 5. A refuse drying apparatus provided with a stirrer for stirring combustible waste in a drying chamber for drying the combustible waste, wherein a flame detection device for detecting a flame when the combustible waste is ignited in the drying chamber. A refuse drying apparatus provided with a fire extinguishing nozzle for spraying water into a drying chamber.