JPH07233929A - Dust feeder - Google Patents

Abstract

PURPOSE:To obtain a dust feeder which feeds refuse stably into an incinerator and enables reduction or prevention of production of hazardous substances. CONSTITUTION:In a dust feeder equipped with a hopper 2 receiving refuse and with screws 3 and 4 provided in the bottom part of the hopper and sending the refuse under pressure onto the discharge port 8 side, a flap damper 10 opening and closing according to a change in the balance between a counterweight 15 and the force of the refuse sent under pressure is provided opposite to a discharge port. It is also possible to provide this flap damper and a rotary drum 12 raking out the refuse sent to the discharge port, oppositely to the discharge port. As for the number of screws provided in the dust feeder, it is not limited at all, of course, and this invention can be applied to both a dust feeder equipped with only one screw and a dust feeder equipped with two or more screws.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dusting apparatus that receives refuse such as municipal waste supplied from a refuse pit and pressure-feeds it to an incinerator, and more particularly, to stably feed the pressure-fed waste to the incinerator. Regarding the means of.

[0002]

2. Description of the Related Art FIG. 4 shows a control flow of a conventionally known refuse incineration facility. As shown in the figure, the waste such as municipal waste stored in the waste pit 101 is stored in the crane 1
At 02, the charging hopper 103 is charged, and the charging hopper 1
03 is conveyed to the hopper unit 106 of the dust feeding device 105 via the conveyor 104, or is directly fed into the hopper unit 106 from the feeding hopper 103. In the dust feeding device 105, the dust received in the hopper unit 106 is provided with the screw 10 provided at the bottom of the hopper unit 106.
The waste is sent to the discharge port 108 side by 7 and discharged into the incinerator 110 through the discharge chute 109. The exhaust heat of the incinerator 110 is recovered by the exhaust heat recovery device 111 and is effectively used. On the other hand, the combustion gas generated in the incinerator 110 is separated into ash and exhaust gas by the dust collector 112, and each is discharged to the outside of the system.

The dust supply device 105 includes an incinerator 110.
The amount of dust thrown in is adjusted so that stable and good combustion can be obtained, and the high temperature combustion gas in the incinerator 110 is prevented from leaking to the hopper unit 106 side and burning the dust in the hopper unit 106. Therefore, in order to realize a so-called material seal and prevent the combustion gas from flowing out, a function of applying a certain pressure to the dust to bring it into a consolidated state is required.

By the way, depending on the nature of the dust supplied into the dust feeder 105, the compaction state becomes abnormally high.
If left as it is, it may be thrown into the incinerator 110 in a solid state. When such a phenomenon occurs, the amount of waste put into the incinerator 110 becomes excessive and it becomes impossible to maintain a preferable combustion state. For example, harmful substances such as carbon monoxide (CO), nitrogen oxides (NOx), or dioxins are generated. It may occur. In order to prevent such inconvenience and maintain a normal combustion state, in the past,
The rotation speed of the screw 107 is controlled to adjust the pressure density of the dust so that it does not rise more than necessary, or a rotary drum for scraping out the dust is disposed on the discharge port 108 side of the dust feeding device 105 to supply dust. A method is used in which waste that has become over-consolidated in the device 105 is crushed by this.

[0005]

However, at the present time when the types and properties of dust are diversified, it is difficult to always properly control the pressure density of dust only by controlling the rotation speed of the screw. In addition, even if combined with the control by the rotating drum, it is not possible to sufficiently eliminate the inconvenience that a large amount of dust is thrown into the incinerator at one time, so it is not possible to stabilize the combustion state and eventually reduce or prevent the generation of harmful substances. There is an inconvenience. In order to eliminate such inconvenience, it is indispensable to develop a means for automatically controlling the amount of waste to be constantly fed into the incinerator according to the pressure density of the waste.

The present invention has been made to solve the above problems, and an object thereof is to provide a dusting apparatus capable of stably supplying waste to an incinerator and reducing or preventing generation of harmful substances. Especially.

[0007]

In order to achieve the above-mentioned object, the present invention provides a duster provided with a hopper for receiving dust and a screw provided at the bottom of the hopper for pressure-feeding the dust to the discharge port side. In the device, a flap damper that opens and closes according to a change in the magnitude relationship between the counterweight and the dust pumping force is provided facing the discharge port.

Further, in the same dusting device as described above,
A flap damper, which opens and closes according to a change in the magnitude relationship between the counterweight and the pressure-feeding force of dust, and a rotary drum, which scrapes out the dust pressure-fed to the discharge port, are provided facing the discharge port.

It should be noted that there is no limitation on the number of screws provided in the dust feeding device, and a dust feeding device having only one screw and a dust feeding device having two or more screws can be used. It can also be applied to.

[0010]

When the flap damper is provided so as to face the discharge port of the dust feeder, the resistance force of the flap spreads the pressure-fed dust in the surface direction of the flap damper and crushes it. Therefore,
Since the supply of waste to the incinerator is evenly divided and the combustion is stabilized, the generation of harmful substances such as CO is reduced or prevented. If a flap damper that opens and closes according to the change in the size relationship between the counterweight and the pressure-feeding force of the dust is used, the resistance force applied to the pressure-fed dust is automatically adjusted without any power. Since it can be adjusted, it is possible to crush the compacted waste easily and efficiently. When the flap damper and the rotary drum are combined, the dust is crushed more efficiently, and the above effect can be further enhanced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A dusting apparatus according to an embodiment will be described below with reference to FIGS. FIG. 1 is a configuration diagram of a dust supply apparatus according to an embodiment, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is B of FIG.
It is a -B sectional view.

In these figures, 1 is a dust supply device, 2
Is a hopper of the dust feeder 1, 3 and 4 are screws for pumping dust provided at the bottom of the hopper 2, 5 is a motor for rotationally driving the screws 3 and 4, and 6 is a rotation of the motor 5. A chain connecting the shaft and the screw 3, 7
Is a gear device that transmits the rotational force of the screw 3 to the screw 4, 8 is a waste discharge port, 9 is a discharge chute that guides the waste discharged from the dust supply device 1 to an incinerator (not shown), 10
Is a flap damper, 11 is a stopper of the flap damper 10, and 12 is a rotary drum.

As is apparent from FIGS. 1 and 2, the flap damper 10 is composed of a plate-shaped body having a width Wa smaller than the width Wb of the discharge port 8, and is provided so as to project from the upper end portion in the left-right direction. The support shaft 13 is attached to the wall surface 8 that constitutes the discharge port 8.
It is arranged at a position facing the discharge port 8 by being pivotally supported by a. An arm 14 is fixed to one end of the support shaft 13 protruding from the wall surface 8a at a right angle thereto, and a counterweight 15 is fixed to the arm 14. Therefore, this flap damper 10
Due to the moment acting on the support shaft 13, the discharge port 8 is always
Is urged to close the.

The stopper 11 is provided to prevent the flap damper 10 from interfering with the rotary drum 12 which will be described in detail later, and is provided on the outer surface of the wall surface 8a.
It is attached to the position where it collides with 4.

As is apparent from FIGS. 1 and 3, the rotary drum 12 has an axis C on the surface of a cylindrical drum body 16.
A large number of scraping bars 17 that are inclined with respect to -C are provided in a projecting manner, and the axis C-C is oriented perpendicular to the axes D-D of the screws 3 and 4, and is below the discharge port 8. It is rotatably arranged. Reference numeral 18 in the figure denotes a central shaft that projects outward from the side end of the rotary drum 12, and one end of the central shaft 18 that projects from the wall surface 8a has a chain 19
The variable speed motor 20 is connected via.

In addition, the hopper 2, the screws 3 and 4,
The drive mechanisms of the screws 3 and 4, and the configurations of the discharge port 8 and the discharge chute 9 are the same as those provided in the known dust feeders of the related art, and are not the gist of the present invention. Omit it.

Next, the operation of the dust supply apparatus according to this embodiment will be described. When dust is put into the hopper unit 2 while the motor 5 and the variable speed motor 20 are activated, the dust is transferred to the discharge port 8 side while increasing the pressure density by the transfer force of the screws 3 and 4. . At this time, the number of rotations of the motor 5 is set in consideration of the required amount of dust input from an incinerator (not shown) and the amount of dust transfer that can realize so-called material sealing. The dust that reaches the tips of the screws 3 and 4 is scraped by the scraping bar 17 of the rotary drum 12.
It is scraped off and abuts on the flap damper 10.
A moment proportional to the dead weight and the weight of the counterweight 15 is applied to the flap damper 10 in a direction to close the discharge port 8. Therefore, a resistance force acts on the dust that has been pumped, and the dust is in the surface direction of the flap damper 10. Is spread and crushed. Then, the crushed dust is discharged from the lower part of the flap damper 10 and the gap between the flap damper 10 and the wall surface 8a forming the discharge port 8, and is discharged into the incinerator (not shown) through the discharge chute 9.

In the dust feeder of the above-mentioned embodiment, the flap damper 10 is provided at the portion facing the discharge port 8. Therefore, the resistance force of the flap damper 10 spreads the crushed dust in the surface direction of the flap damper 10. Therefore, it is possible to stably supply the waste to the incinerator and to reduce or prevent the generation of harmful substances such as CO. Further, since the flap damper 10 used is one that opens and closes according to the change in the magnitude relation between the counterweight 15 and the pressure-feeding force of the dust, when the dust pressure density is high, the flap damper 10 as shown by the broken line in FIG. When 10 rotates counterclockwise to increase the resistance force acting on the dust and the pressure density of the dust is low, the flap damper 10 swivels clockwise to act on the dust as shown by the solid line in FIG. The resistance to crushing becomes low, and regardless of the compaction density, it is possible to crush the waste that is constantly pumped and put it into the incinerator. Further, since the magnitude of the resistance force applied to the pressure-fed waste can be automatically adjusted without requiring any power, the compacted waste can be disintegrated easily and efficiently. Furthermore, the dust feeder of this example is provided with the flap damper 10
Since both the rotary drum 12 and the rotary drum 12 are provided, the waste is crushed more efficiently.

Other examples of the present invention will be listed below.

Although the flap damper 10 is integrally formed in the above embodiment, the flap damper may be composed of a plurality of independently operating portions according to the number of screws. In this way, the crushing can be performed more finely according to the state of the dust that has been pumped.

In the above-described embodiment, both the flap damper 10 and the rotary drum 12 are provided, but it is also possible to provide only the flap damper 10. Even in this case, it is more effective in crushing dust than the conventional product, and by omitting the rotary drum 12, the dust supply device can be made inexpensive.

Although the two screws 3 and 4 are provided in the above-mentioned embodiment, the number of the screws provided in the dust feeding device 1 is not limited at all, and the dust having only one screw is provided. It can be applied to a device and also to a dusting device having two or more screws.

In the above embodiment, the rotary shaft of the motor 5 and the screw 3 are connected by the chain 6, the rotary shaft of the variable speed motor 20 and the central shaft 18 of the rotary drum 12 are connected by the chain 19, and further, Although the screw 3 and the screw 4 are connected via the gear device 7, the gist of the present invention is not limited to this, and the screw 3 and the screw 4 can be connected via any known power transmission mechanism. Further, the motor and the rotary shaft can be directly connected without a power transmission mechanism.

[0024]

As described above, according to the present invention,
A flap damper was installed facing the discharge port, which opens and closes according to the change in the magnitude relationship between the counterweight and the dust pumping force.The resistance force spreads the pumped dust in the plane direction of the flap damper for crushing. In addition, a stable supply of dust to the incinerator can be achieved, and the generation of harmful substances such as CO can be reduced or prevented. Also, as the flap damper, one that opens and closes according to the change in the magnitude relationship between the counter weight and the pressure-feeding force of the dust is used, so the amount of resistance applied to the pressure-fed dust is automatically adjusted without any power. The crushing of the compacted waste can be performed easily and efficiently. Further, when the flap damper and the rotary drum are combined, the dust is crushed more efficiently, so that the above effect can be further enhanced.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a dust supply apparatus according to an embodiment.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is an explanatory diagram of a conventionally known refuse incineration facility.

[Explanation of symbols]

 1 Dust supply device 2 Hopper part 3,4 Screw 8 Waste discharge port 9 Discharge chute 10 Flap damper 11 Stopper 12 Rotating drum 13 Support shaft 14 Arm 15 Counterweight

Claims (3)

[Claims] 1. A dusting apparatus comprising a hopper for receiving dust and a screw provided at a bottom portion of the hopper for pressure-feeding the dust to a discharge port side, the counterweight and the dust collecting unit facing the discharge port. A dust-feeding device, which is provided with a flap damper that opens and closes according to a change in magnitude relationship with a pumping force. 2. A dust collector provided with a hopper for receiving dust and a screw provided at a bottom portion of the hopper for pressure-feeding the dust to a discharge port side, the counterweight and the dust collecting device facing the discharge port. A dust supply device comprising: a flap damper that opens and closes according to a change in magnitude relationship with a pressure-feeding force; and a rotary drum that scrapes out dust that has been pressure-fed to the discharge port. 3. The dust-feeding device according to claim 1, wherein a plurality of the screws are provided.