JPH08595Y2 - Damper structure of slag slag device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a damper structure of a slag slag device used in a surface melting furnace for melting and processing a dried cake of sewage sludge and an incineration residue of an incinerator.

Conventional technology Conventionally, as a slag slag device used in a surface melting furnace for melting an incineration residue or a dried sludge cake, for example, a droplet of molten slag falling from a slag port is temporarily received by a damper to perform air cooling. Then, there was a thing to drop on the discharge conveyor. The damper is made of refractory, and the refractory on the slag receiving surface that receives the slag is cooled to a certain temperature to improve the slag's separability. Water was passing through.

However, in the damper structure described above, the cold heat of the cooling water flowing through the cooling water flow path is transmitted almost uniformly to the slag receiving surface through the refractory, and the molten slag that remains on the damper is slag receiving surface. The part in contact with the surface solidifies to form a uniform self-insulating layer. For this reason, the slag discharged from the slag device after cooling with air becomes a large lump, and it was necessary to crush the slag before it was put into the discharge conveyor.

The present invention solves the above problems, and an object of the present invention is to provide a damper structure of a slag slagging device, which is capable of splitting solidified slag into lumps having an appropriate size when discharged.

Means for Solving the Problems In order to solve the above problems, the present invention is directed to a slag that is arranged immediately below a slag port of a surface melting furnace and collects molten slag dripping from a lower end opening of the slag port on a slag receiving surface. In a damper of a slag device, aggregates having cooling water flow passages formed inside are arranged in a grid to form a cooling frame, and one side of the cooling frame forms a part of the slag receiving surface and aggregates are formed. A refractory material is filled in the inner space of the cooling frame surrounded by to form a slag receiving surface.

Action With the above-mentioned configuration, the liquid molten slag dropped from the slag port is collected on the slag receiving surface on the upper surface of the damper, and retains in an annular shape in the initial state. Stay. Further, the molten slag staying on the slag receiving surface is cooled by the cooling water flowing through the cooling water flow path of the aggregate through the cooling frame or the refractory, and the vicinity in contact with the slag receiving surface is solidified to form a self-insulating layer. To do.

The molten slag staying on the slag receiving surface has a different cooling rate between the portion contacting the cooling frame and the portion contacting the refractory during solidification, so that the growth of the solidified layer is uniform. However, distortion occurs at the boundary between the part that contacts the cooling frame and the part that contacts the refractory, and the fragile parts are formed in a grid shape along the cooling frame, and the solidified slag cracks in a grid shape. It occurs and splits.

Further, the amount of cooling water is suddenly changed to change the surface temperature of the cooling frame, thereby giving a thermal shock to the solidified slag and promoting the generation of cracks.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, a surface melting furnace 1 has a furnace body formed by loosely fitting an inner cylinder 2 and an outer cylinder 3, and a furnace ceiling 4 is formed to form the bottom of the inner cylinder 2 and an outer cylinder. A slag port 6 for discharging the molten slag 5 is formed at the bottom of 3. Further, the inner cylinder 2 is provided to be movable up and down with respect to the fixed frame 7, and an inner cylinder elevating device 9 is interposed between the elevating frame 8 supporting the inner cylinder 2 and the fixed frame 7. Further, the outer cylinder 3 is rotatably supported by the fixed frame 7 via a receiving roller 10 about a vertical axis, and the outer cylinder 3 is rotatably driven between the outer cylinder 3 and the fixed frame 7. The drive device 11 is interposed.

Further, the fixed frame 7 is provided with a charging device 12 in communication with a furnace space formed between the inner cylinder 2 and the outer cylinder 3, and the charging device 12 is a melted material such as a dried cake of sewage sludge. It is for charging 13 into the furnace. Further, the melted substance 13 charged into the furnace space is accumulated in an annular shape around the inner cylinder 2 and forms an inverted conical inclined surface 14 having an angle of repose around the slag port 6. A main combustion chamber 15 is formed by the inclined surface 14 and the furnace ceiling portion 4, and the main combustion chamber 15 is formed.
A plurality of main combustion burners 16 that radiate flames are provided in the furnace ceiling portion 4.

A secondary combustion furnace 17 is provided below the outer cylinder 3 so as to communicate with the slag port 6, and the secondary combustion furnace 17 emits a flame to a secondary combustion chamber 18 formed inside. A secondary combustion burner 19 is provided. Further, a flue 21 for discharging the exhaust gas 20 is provided on a side portion of the secondary combustion furnace 17 so that one end side thereof communicates with the secondary combustion chamber 18, and the other end of the flue 21 is an exhaust gas treatment device. (Not shown).

Then, below the secondary combustion furnace 17, a slag slag device 22 is provided in communication with the secondary combustion chamber 18, and the slag slag device 22 is provided with dual damper devices 23, 24. Cage,
Each of the damper devices 23 and 24 has a pair of dampers 25 and 26 that extend and retract in the horizontal direction. In addition, each damper device
Cylinder devices 27 for driving the dampers 25, 26 to move in and out are provided at 23, 24. In addition, each slag slag device 22
A scraper 28 that is in sliding contact with the upper surfaces of the dampers 25 and 26 is provided inside the furnace.

Further, as shown in FIG. 2, a cooling water passage is formed by a water pipe 29 inside each damper 25 in the upper stage,
Slag receiving surface by refractory material 30 provided over water pipe 29
31 is formed. Further, one end of the stud 32 connected to the water pipe 29 is exposed at the slag receiving surface 31.

Then, as shown in FIGS. 3 to 5, the lower damper 26 has a lattice-shaped cooling frame 33, and the cooling frame 33 is formed of an aggregate 35 in which a cooling water flow path 34 is formed. Has been done. In addition, refractory is placed in the space surrounded by the aggregate 35 of the cooling frame 33.
36 is filled to form the slag receiving surface 37, and the cooling frame
The upper surface of 33 forms part of the slag receiving surface 37 and is exposed.
Further, the water pipe 29 and the cooling water flow path 34 of the aggregate 35 communicate with the water supply pipe 38 and the drain pipe 39.

The operation of the above configuration will be described below. The material to be melted 13 is charged into the furnace space from the charging device 12, and the main combustion chamber 15 is formed below the furnace ceiling 4. And the main combustion burner 16
Thus, the melted material 13 is ignited and burned, and thereafter, the combustion temperature in the main combustion chamber 15 is maintained at 1300 to 1500 ° C. by the heating by the main combustion burner 16 and the self-combustion of the melted material 13. The combustion temperature is controlled by controlling the fuel of the main combustion burner 16 or by changing the space volume of the main combustion chamber 15 by raising and lowering the inner cylinder 2 by the inner cylinder elevating device 9.

Then, in the normal operation state, the melted material 13 is melted from the surface side of the inclined surface 14 that is in contact with the main combustion chamber 15, the molten slag 5 that has melted flows down along the inclined surface 14, and the slag port 6
Is dripped into the secondary combustion chamber 18. Also, on the inclined surface 14,
By the rotation of the outer cylinder 3 by the drive device 11, the melted material 13 that is cut off from around the lower end of the inner cylinder 2 is continuously supplied.

Then, the unburned gas is completely combusted by combustion of the secondary burner 19 in the secondary combustion chamber 18, the exhaust gas 20 is low NO _X combustion by two-stage combustion following the main combustion chamber 15. Moreover, the solidification of the molten slag 5 in the slag port 6 is prevented by the heating in the secondary combustion chamber 18.

Then, the molten slag 5 in the form of droplets dropped from the peripheral edge of the lower end opening of the slag port 6 is collected on the slag receiving surface 31 of the upper damper 25, and retains in an annular shape in the initial state. And stay in a single layer. Further, the cooling water 40 supplied from the water supply pipe 38 flows into the water pipe 29, and refractory
The molten slag 5 staying on the slag receiving surface 31 is cooled via 30 and solidified in the vicinity of the portion in contact with the slag receiving surface 31 to form a self-insulating layer. Damper 25 by this self-insulating layer
Good releasability against is secured.

And, each of the upper dampers 25 is a cylinder device.
A lump of molten slag 5 is dropped on the lower damper 26 by retreating left and right by 27 and opening and closing. The molten slag 5 staying on the slag receiving surface 37 of the lower damper 26 is air-cooled and is cooled by the cooling water 40 flowing through the cooling water passage 34 of the aggregate 35 through the cooling frame 33 or the refractory material 36. It During the progress of this solidification, the molten slag 5 is cooled by the cooling frame 33.
Since the cooling rate is different between the portion contacting with and the portion contacting the refractory 36, the solidified layer does not grow uniformly,
Distortion occurs at the boundary between the portion contacting the cooling frame 33 and the portion contacting the refractory 36, and the portion weak in strength is the cooling frame.
The solidified slag, which is formed along the aggregates 35 of 33 in a lattice shape, cracks and splits in a lattice shape.

Further, the cooling water amount 40 flowing through the cooling water flow path 34 of the aggregate 35 is
Is rapidly changed to change the surface temperature of the cooling frame 33, thereby giving a thermal shock to the solidified slag to promote the generation of cracks. Then, the solidified slag is discharged to the outside by opening the damper device 24 on the lower stage, and the splitting progresses due to the shock at the time of discharging. Further, when the dampers 25, 26 are retracted, the scraper 28 scrapes off the slag remaining on the slag receiving surfaces 31, 37 each time and cleans it.

Effects of the Invention As described above, according to the present invention, when the molten slag accumulated on the slag receiving surface is solidifying, the cooling rate is made different between the portion contacting the cooling frame and the portion contacting the refractory. It is possible to form a weakly strong portion in a grid shape along the cooling frame, and to crack the solidified slag in a grid shape to split the slag. Further, by suddenly changing the amount of cooling water, it is possible to change the surface temperature of the cooling frame and give a thermal shock to the solidified slag to promote the generation of cracks.

[Brief description of drawings]

1 is an overall configuration diagram showing an embodiment of the present invention, FIG. 2 is a vertical sectional view of the slag slagging device of the same embodiment, and FIG. 3 is a vertical section of a lower damper of the slag slagging device of the same embodiment. FIG. 4 is a plan view of the lower damper of the slag slagging device of the same embodiment, and FIG. 5 is an enlarged vertical sectional view of the lower damper of the slag slagging device of the same embodiment. 1 …… Surface melting furnace, 5 …… Melting slag, 6 …… Slag port, 23,24 …… Damper device, 25,26 …… Damper, 29
…… Water pipe, 31,37 …… Slag receiving surface, 33 …… Cooling frame, 34…
… Cooling water flow path, 35 …… Aggregate, 36 …… Refractory.

Claims (1)

[Scope of utility model registration request] 1. A damper of a slag slagging device, which is arranged immediately below a slag port of a surface melting furnace and collects molten slag dripping from a lower end opening of the slag port on a slag receiving surface, has a cooling water flow passage inside. The formed aggregate is arranged in a grid to form a cooling frame, and one side of the cooling frame forms a part of the slag receiving surface, and a refractory is provided in the internal space of the cooling frame surrounded by the aggregate. A damper structure for a slag slag extractor characterized by being filled to form a slag receiving surface.