JP4129191B2 - Combustible dust injection equipment for waste melting furnaces - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a combustible dust blowing facility for a waste melting furnace for pyrolyzing and melting waste such as general waste and industrial waste.
[0002]
[Prior art]
As a waste disposal method such as general waste and industrial waste, waste is charged into a shaft furnace type waste melting furnace, and the waste is dried, preheated, pyrolyzed, combusted, melted, slag and metal There is known a pyrolysis melting furnace treatment method to be taken out as
[0003]
In the operation of the waste melting furnace, combustibles in the charge are thermally decomposed in the furnace to generate a residue. The generated pyrolysis residue is combusted by the air sent from the tuyere or accumulated in the furnace, but the fine one is not burned by the air sent from the tuyere, Ride as a flammable dust from the furnace.
[0004]
As a technique for treating combustible dust scattered in a waste melting furnace, for example, Patent Document 1 describes a facility for blowing combustible dust from a tuyere.
[0005]
FIG. 4 is an explanatory diagram of the combustible dust supply line described in the above-mentioned document. In the figure, combustible dust generated in the waste melting furnace 1 is collected by a dust remover 2 and stored in a combustible dust hopper 3. The screw conveyor 3a of the combustible dust hopper 3 is connected to the water-cooled screw conveyor 6 for cooling the combustible dust by the pipe 5 through the switching damper 4, and the combustion chamber 9, the switching damper 7, and the combustibility. It connects via the screw conveyor 8 for the combustion chamber 9 which throws in dust. The combustible dust is supplied to the water-cooled screw conveyor 6 on the blowing side and the screw conveyor 8 for the combustion chamber 9 by rotating the screw conveyor 3a of the combustible dust hopper 3 forward or reverse. The switching dampers 4 to 7 on the side carrying the dust are opened and the other damper is closed.
[0006]
When supplying combustible dust to the blowing side, the switching damper 4 of the pipe 5 is opened, and the combustible dust is dropped onto the intermediate hopper 11 through the screw conveyor 3a, the water-cooled screw conveyor 6, and the sieve device 10. In the intermediate hopper 11, the upper and lower dampers 11 a and 11 b are alternately opened and closed to drop the combustible dust into the blowing device 12 without mixing the combustible gas and the carrier air.
[0007]
Thereafter, the combustible dust in the blowing device 12 is blown into the tuyere 15 by the blower 14 by adjusting the rotation amount of the circle feeder 13 by the motor M and adjusting the blowing amount.
[0008]
The combustible dust is supplied to the combustion chamber 9 through the screw conveyor 8 with the switching damper 7 opened. The supply amount to the combustion chamber 9 is performed while adjusting the number of revolutions of the motor M with the weight indicating controller WIC.
[0009]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-108209
[Problems to be solved by the invention]
According to the above-mentioned documents, a dust remover 2 that collects combustible dust generated in the waste melting furnace 1, a combustible dust hopper 3, screw conveyors 3a and 8, pipe 5, a water-cooled screw conveyor 6, a sieve device 10, the intermediate hopper 11 and the blowing device 12 are installed in this order on the building melting furnace floor.
[0011]
Further, the dust remover 2 to the blowing device 12 are installed on each floor separately from the second floor to the sixth floor of the building floor of the waste melting furnace. For this reason, the equipment cost is high, the installation space for the equipment is large, and the construction construction cost and the installation construction cost are required. In addition, the design is complicated and a design cost is required.
[0012]
Therefore, the present invention provides a combustible dust injection facility that has low equipment costs, a small installation space for equipment, and a low construction work cost, installation work cost, and design cost.
[0013]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the combustible dust blowing equipment of the waste melting furnace according to claim 1 collects the combustible dust from the waste melting furnace with a dust remover, and combusts the collected combustible dust. In the combustible dust blowing equipment of the waste melting furnace, which is cut out from the dust hopper and transported to the blowing device and blown from the tuyere by air transportation, the combustible dust is transported to the combustible dust transport path between the combustible dust hopper and the blowing device. Screw conveyor for cutting out dust, a cylindrical rotating drum cooling device for cooling combustible dust rotating coaxially with the screw conveyor, and further rotating coaxially connected with the rotating drum cooling device a cylindrical rotating sieve provided, the outlet of the combustible dust below the rotating sieve is provided, it provided the outlet of the large mass of combustible in the dust beneath the exit side of the rotary sieve Of combustible dusts cooling, the sieve device into one device, the said rotary drum type cooling device, and supplying the cooling water via the screw shaft of the screw conveyor.
[0014]
The combustible dust blowing equipment for a waste melting furnace according to claim 2 is configured to collect the combustible dust from the waste melting furnace with a dust remover and cut out the collected combustible dust from the combustible dust hopper. A screw conveyor that cuts out flammable dust in the flammable dust transfer path between the flammable dust hopper and the blowing device in the flammable dust blowing equipment of the waste melting furnace that is blown by air transfer from the tuyere A cylindrical rotating drum type cooling device for cooling combustible dust that is connected coaxially with the screw conveyor and rotating, and a cylindrical rotating sieve that is connected coaxially with the rotating drum type cooling device are provided. the outlet of the combustible dust below the rotating sieve is provided, on the said rotary drum-type cooling device, the cooling water via the screw shaft of the screw conveyor Sheet is the combustible dust cooling, by integrating the sieve device, characterized in that disposed in the casing.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples shown in the drawings.
[0019]
Example 1
FIG. 1 is an explanatory view showing a first embodiment of the present invention. The same components as those shown in FIG. 4 are denoted by the same reference numerals, and the description thereof is omitted.
[0020]
In FIG. 1, the configuration on the upstream side of the facility is not shown, but is the same as the conventional example shown in FIG. 4, and combustible dust generated and scattered in the waste melting furnace 1 is collected by the dust remover 2. However, it is temporarily stored in the combustible dust hopper 3. When a predetermined amount of combustible dust is stored in the combustible dust hopper 3, the switching damper 4 of the pipe 5 is opened, and combustible dust is supplied to the combustible dust cooling and sieving device 16.
[0021]
The combustible dust cooling and sieving device 16 is provided with a screw conveyor 16c having a screw shaft 16b for cutting the combustible dust into a cooling drum 16d in a casing 16a, and the screw conveyor 16c and the cooling drum 16d are coaxially connected to the screw shaft 16b. Rotate.
[0022]
Cooling water is supplied to the cooling drum 16d via the screw shaft 16b, and the flammable dust is efficiently cooled while rotating the combustible dust by the screw-like cooling fins 16e provided inside the short cylindrical cooling drum 16d. It is carried out to the sieve 16f.
[0023]
The sieve 16f is also coaxially connected to the screw shaft 16b, and is coaxially connected to the screw conveyor 16c and the cooling drum 16d to rotate. The sieve 16f has a cylindrical shape made of perforated punched metal or the like, and is a large lump that interferes with conveyance from combustible dust from the discharge port 16g below the sieve 16f by rotating coaxially with the screw shaft 16b. The dust from which etc. are removed is discharged as under-sieving dust, and a large lump is sent to the exit side of the sieve 16f by the paddle 16h and discharged from the lower discharge port 16i.
[0024]
The discharge port 16g is directly connected to the combustible dust blowing device 12 as a double damper via an upper damper 17a and a lower damper 17b.
[0025]
Further, the combustible dust cooling, the sieving device 16 and the blowing device 12 connected by the upper damper 17 a and the lower damper 17 b are mounted on the common frame 18 including the circle feeder 13 and the blower 14.
[0026]
In the above configuration, when the weight indicator WI confirms that a predetermined amount of combustible dust is stored in the combustible dust hopper 3, the switching damper 4 of the pipe 5 is opened (see FIG. 4), and further The damper 17a is opened and the lower damper 17b is closed, the combustible dust is cooled, the motor M of the screw shaft 16b of the sieving device 16 is driven, the screw conveyor 16c is rotated, and the combustible dust is sent to the cooling drum 16d. . The combustible dust is cooled to a temperature not ignited by the cooling drum 16d, for example, about 40 ° C., and sent to the sieve 16f. The combustible dust under the sieve falls to the lower damper 17b from the discharge port 16g, and the dust on the sieve Falls to the dust transport line on the sieve from the discharge port 16i.
[0027]
The combustible dust is supplied while adjusting the rotation speed of the motor M with the weight indicating controller WIC of the combustible dust hopper 3 (see FIG. 4). When the predetermined amount of combustible dust is cut out, the upper damper 17a is closed, and then the lower damper 17b is opened, and the combustible dust is put into the combustible dust blowing device 12.
[0028]
After the loading, the lower damper 17b is closed and the upper damper 17a is opened. The subsequent operations of the upper damper 17a and the lower damper 17b are repeated.
[0029]
The combustible dust in the blowing device 12 is blown into the tuyere 15 by the blower 14 by adjusting the number of rotations of the circle feeder 13 by the motor M with the weight indicating controller WIC to adjust the blowing amount.
[0030]
Example 2
FIG. 2 is an explanatory view showing a second embodiment of the present invention. The same components as those shown in FIG. 4 are denoted by the same reference numerals, and the description thereof is omitted.
[0031]
In FIG. 2, a hopper 19 for temporarily storing flammable dust and a rotary seal valve for cutting out the flammable dust at a lower portion of a dust remover 2 such as a cyclone for collecting the flammable dust generated and scattered in the waste melting furnace 1. A cutting device 20 is installed.
[0032]
In the combustible dust conveyance path between the cutting device 20 and the blowing device 12, combustible dust cooling for cooling and sieving the combustible dust, the sieve device 22 is connected to the cutting device 20 via the damper 21. Has been. A hopper 23 having a flat bottom surface for injecting combustible dust into the blowing device 12 is installed below the sieve 22a of the flammable dust cooling and sieving device 22, and a stirring type discharger 24 is installed below the hopper 23. Yes. The hopper 23 is connected to the blowing device 12 via a damper 25.
[0033]
The combustible dust cooling and sieving device 22 cools the flammable dust by the cooling drum 22c and conveys it to the sieve 22a via, for example, the screw conveyor 22b. The sieve 22a discharges dust from which lumps or the like that hinder the conveyance from combustible dust are discharged to the hopper 23 as sieving dust, and the discharger 24 below the hopper 23 rotates the stirring blade 24a by the motor M. The blower 12 is charged.
[0034]
Further, a combustible dust transport path is provided between the blowing device 12 and the combustion chamber 9, and the combustible dust transport path and a combustible dust transport path between the tuyere 15 and the blowing device 12 are provided. Switching is possible by opening and closing the dampers 26a and 26b.
[0035]
In the above configuration, the damper 21 is opened, the damper 25 is closed, the combustible dust is cooled, the motor M of the sieving device 22 is driven, the screw conveyor 22b is rotated, and the combustible dust is removed by the cutting device 20. Is cut out and sent to the cooling drum 22c. The combustible dust is cooled to a temperature at which it is not ignited by the cooling drum 22 c, for example, about 40 ° C. and sent to the sieve 22 a, and the combustible dust under the sieve is discharged to the hopper 23.
[0036]
When the discharge of the predetermined amount of combustible dust is completed, the damper 21 is closed, and then the damper 25 is opened to introduce the combustible dust into the blowing device 12. At that time, the rotary seal valve of the cutting device 20 is temporarily stopped, and combustible dust is temporarily stored in the hopper 19.
[0037]
After the introduction, the damper 25 is closed and the damper 21 is opened. Subsequent operations of the damper 21 and the damper 25 are repeated.
[0038]
The combustible dust in the blowing device 12 is blown into the tuyere 15 by the blower 14 by adjusting the number of rotations of the circle feeder 13 by the motor M with the weight indicating controller WIC to adjust the blowing amount. At this time, the damper 26a is closed and the damper 26b is opened.
[0039]
On the other hand, by opening the damper 26 a and closing the damper 26 b, the combustible dust transport path is switched to the transport path toward the combustion chamber 9, and combustible dust is blown into the combustion chamber 9.
[0040]
Example 3
FIG. 3 is an explanatory view showing a third embodiment of the present invention. The same components as those shown in FIG. 2 are denoted by the same reference numerals, and the description thereof is omitted.
[0041]
In the present embodiment, in the combustible dust conveyance path between the cutting device 20 and the blowing device 12, the combustible dust cooling and sieving device 22 for cooling and sieving the combustible dust, the upper device 27a and the lower material 27b. The flammable dust cooling and sieving device 22 is directly connected to the blowing device 12.
[0042]
In this configuration, when the upper damper 27a is opened and the lower damper 27b is closed and the discharge of the predetermined amount of combustible dust is completed, the upper damper 27a is closed and the upper damper 27a and the lower damper 27b are equalized. Therefore, the pressure equalizing valve 27c is opened, and if it is confirmed that the pressure is equalized, the lower damper 27b is opened to discharge the combustible dust to the combustible dust cooling and sieving device 22. At that time, the rotary seal valve of the cutting device 20 is temporarily stopped, and after the combustible dust is temporarily stored in the hopper 19, the pressure equalizing valve 27c and the lower damper 27b are closed, and the upper damper 27a is opened. The subsequent operations of the upper damper 27a, the lower damper 27b, and the pressure equalizing valve 27c are repeated.
[0043]
Next, the motor M of the combustible dust cooling and sieving device 22 is driven, the screw conveyor 22b is rotated, and the combustible dust discharged by the lower damper 27b is sent to the cooling drum 22c. The combustible dust is cooled to a temperature at which it is not ignited by the cooling drum 22c, for example, about 40 ° C. and sent to the sieve 22a, and the combustible dust under the sieve is discharged to the blowing device 12.
[0044]
The combustible dust in the blower 12 is blown into each tuyere 15 by a blower after the level of LA is adjusted by the motor M to adjust the rotation speed of the circle feeder 13 and the blower amount is adjusted.
[0045]
【The invention's effect】
In the first aspect of the invention, the combustible dust cooling and sieving device includes a rotating drum type cooling device that has a high flammable dust cooling capacity and requires a small installation space, and a rotary screen that has excellent durability because of the rotary type. This is one device and the equipment cost is reduced. Moreover, since cooling water is supplied to a rotating drum type cooling device via the screw shaft of a screw conveyor, the cooling efficiency improves.
[0046]
In the invention of claim 2, since the cooling of the combustible dust and the sieving device are integrated and arranged in the casing, the installation space for the facility is small, and the construction construction cost, the installation construction cost and the design cost are greatly increased. Become cheap. Further, since cooling water is supplied to the cooling device for the combustible dust and the rotating drum type cooling device of the sieving device via the screw shaft of the screw conveyor, the cooling efficiency is improved.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a first embodiment of the present invention.
FIG. 2 is an explanatory view showing a second embodiment of the present invention.
FIG. 3 is an explanatory diagram showing a third embodiment of the present invention.
FIG. 4 is an explanatory diagram of a conventional combustible dust supply line.

Claims (2)

Combustible dust from a waste melting furnace is collected by a dust remover, and the collected combustible dust is cut out from a combustible dust hopper and transported to a blowing device. In the dust blowing equipment
A screw conveyor that cuts out the combustible dust in the combustible dust transfer path between the combustible dust hopper and the blowing device, and a cylindrical rotation for cooling the combustible dust that is connected to the screw conveyor and rotates coaxially. drum-type cooling device, further the rotary drum-type cooling device and the rotation sieve cylindrical rotating coupled coaxially provided, the outlet of the combustible dust below the rotating sieve is provided, the rotating sieve outlet side of the The combustible dust cooling and sieving device provided with a large mass outlet in the combustible dust below is a single device, and cooling water is supplied to the rotating drum type cooling device via the screw shaft of the screw conveyor. A combustible dust blowing facility for a waste melting furnace characterized by supplying. Combustible dust from a waste melting furnace is collected by a dust remover, and the collected combustible dust is cut out from a combustible dust hopper and transported to a blowing device. In the dust blowing equipment
A screw conveyor that cuts out the combustible dust in the combustible dust transfer path between the combustible dust hopper and the blowing device, and a cylindrical rotation for cooling the combustible dust that is connected to the screw conveyor and rotates coaxially. A drum-type cooling device , and a cylindrical rotary sieve rotating coaxially with the rotary drum-type cooling device are provided. A combustible dust discharge port is provided below the rotary sieve, and the rotary drum-type cooling device is provided. Is a combustible dust cooling facility for a waste melting furnace, in which combustible dust cooling and a sieving device to which cooling water is supplied via a screw shaft of the screw conveyor are integrated and disposed in a casing.

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