JP2749497B2 - Ash supply method and apparatus in burner type ash melting furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to reduce the volume and harmlessness of incinerated ash discharged from refuse incinerators, industrial waste incinerators, etc. by heating and reusing the produced slag. The present invention relates to a method and an apparatus for supplying ash in a burner type ash melting furnace.

[0002]

2. Description of the Related Art As shown in FIG. 4 , a conventional burner-type melting furnace of, for example, a combustion gas co-current type is provided with an ash supply hopper 3 at an upstream side of a melting chamber 2 at a center of a furnace body 1 through an ash inlet 3a.
And an ash pusher 4 for cutting out the incineration ash G by a predetermined amount, and a slag discharge port 5 is provided downstream of the melting chamber 2.
A slag cooling chamber 7 having a cooling water tank 6 is disposed through the slag cooling chamber 7. The bottom wall of the melting chamber 2 is inclined downward from the upstream side where the ash supply hopper 3 is located to the downstream side where the slag outlet 5 is located, and an exhaust gas pipe 8 is connected to the slag cooling chamber 7. A melting burner 9 is disposed on the top wall.

In the above configuration, incineration ash G supplied from the ash supply hopper 3 is cut out by the ash pusher 4 by a predetermined amount, and is heated and melted by the melting burner 9, and the combustion exhaust gas D from the melting burner 9 is melted by the slag S Is sucked from the melting chamber 2 into the slag cooling chamber 7 in parallel with the molten slag S to flow down together with the molten slag S.
In addition, the combustion exhaust gas D entering the slag cooling chamber 6 can be introduced into the heat exchanger 10 via the exhaust gas pipe 8 to preheat the combustion air to the melting burner 9.

As shown in FIG. 5 , the combustion gas counter-flow burner type melting furnace has an ash supply hopper 13 provided upstream of a furnace body 11 through an ash inlet 13a. An ash pusher 14 for cutting out the incineration ash G by a predetermined amount is provided at 13a. Further, a slag cooling chamber 16 is provided at a downstream end of the furnace body 11 through a slag outlet 15, and a cooling water tank for manufacturing a water-cooled slag M by water-cooling the molten slag S below the slag cooling chamber 16. 17 are arranged. The furnace body 11 has a melting chamber 1 at the downstream side.
8, a preheating chamber 19 is arranged on the upstream side, and the bottom walls of the melting chamber 18 and the preheating chamber 19 are inclined downward from the ash supply port 12 at the upstream end to the slag outlet 15 on the downstream side. . A melting burner 20 is disposed on a ceiling wall of the melting chamber 18, and an exhaust gas port 21 is formed on a ceiling wall of the preheating chamber 19, and an exhaust gas pipe 22 is connected thereto.

In the above configuration, the incineration ash G supplied from the ash supply hopper 13 is cut out by the ash pusher 14 by a predetermined amount, and most of the combustion exhaust gas D1 of the melting burner 20 is guided from the melting chamber 18 to the preheating chamber 19 and added. The unburned portion in the flue gas D1 is secondarily burned by the additional air from the air nozzle 23 to preheat the incineration ash G in the preheating chamber 19, and is further heated and melted by the melting burner 20 in the melting chamber 18, and further burned. Is introduced from the melting chamber 18 to the slag cooling chamber 16, and the unburned portion in the combustion exhaust gas D 2 is secondarily burned by the additional air from the additional air nozzle 24. Can be prevented from solidifying and clogging.

[0006]

The ash supply mechanism in the burner type ash melting furnace described above pushes the incinerated ash G supplied to the ash supply hoppers 3, 13 by pushing the ash pushers 4, 14 provided at the bottom of the outlet. The members 4a, 14a are moved back and forth by the push cylinders 4b, 14b, and the ash inlet 3
a and 13a are sent to the melting chambers 2 and 18 side.
Are extruded by the pushing members 4a and 14a.

Therefore, in this ash supply mechanism, (1) the ash supply amount fluctuates depending on the accumulation amount of the incinerated ash G in the ash supply hoppers 3 and 13. (2) The ash supply amount varies depending on the ash accumulation amount on the downstream side of the ash inlets 3a and 13a in the furnace. (3) The outside air enters the furnace through the gap of the incineration ash G in the ash supply hoppers 3 and 13, or the combustion gas escapes to the outside through the gap of the incineration ash G to lower the furnace temperature. There was a problem.

An object of the present invention is to solve the above-mentioned problems and to provide a method for supplying ash in a burner type ash melting furnace capable of efficiently performing melting processing with little variation in the ash supply amount and without intrusion of outside air or escape of combustion gas. It is intended to provide a device.

[0009]

In order to solve the above-mentioned problems, a method of supplying ash in a burner type ash melting furnace according to the present invention comprises an ash supply hose disposed at an upstream end of the furnace through an ash supply port.
At the outlet of the hopper, push the ash pusher extruded body toward the ash supply port
To move the ash from the ash supply hopper to the ash melting furnace
At this time, the extruded body is divided into a plurality
By moving the split extruded body back and forth
And remove the ash from the ash supply hopper to the front
Consolidation through a consolidation passage formed in approximately the same cross section as the surface
It is extruded almost continuously into the furnace as it evolves .

In the ash supply device, an ash supply hopper is disposed at an upstream end of the furnace through an ash supply port, and an ash pusher capable of retracting the extruded body toward the ash supply port is provided at an outlet bottom of the ash supply hopper. in the ash melting furnace arrangement was, the supply port, the consolidation passage portion of the front section is substantially the same cross-section of the extruded body was formed in a range of a predetermined length on the outlet side from the projecting end position of the extrudate, the extrudate
Is composed of divided extruded bodies divided into multiple parts in the width direction
At the same time, push each extruded body separately into a push cylinder
With the push cylinder
It is configured to send ash almost continuously by shifting the driving time
It was done.

[0011]

According to the above construction, when the ash is supplied from the ash supply hopper into the furnace through the consolidation passage of the ash supply port, the ash is compacted by the pressing force of the divided extruded body of the ash pusher while the ash is being compacted. Compressed and condensed at almost constant pressure without being affected by the amount of ash deposited in the ash supply hopper or the amount of ash already deposited in the furnace, always supplying a constant amount into the furnace be able to. Also, the ash compacted in the compaction passage can prevent inflow and outflow of outside air and combustion gas between the inside of the furnace and the ash supply hopper, thereby preventing the temperature inside the furnace from lowering. Furthermore, by the ash solidified by consolidation,
The movement in the preheating chamber and the melting chamber in the furnace can be performed smoothly, and the amount of ash scattered in the furnace is reduced, and the amount of ash discharged accompanying the combustion gas can be significantly reduced. Further
Nima was, retraction drive to out by even a multiple split extrudate time
Therefore, fluctuations in the furnace atmosphere can be suppressed and stable operation can be achieved.
It becomes possible.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a countercurrent burner type ash melting furnace according to the present invention will be described below with reference to FIGS. The same members as those in the related art are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 31 denotes an ash supply port formed between the ash supply hopper 13 and the preheating chamber 19 and a consolidation passage portion 32 on the inlet side.
And an expansion passage portion 33. Also ash pusher
40 is a plurality of (three in the figure) divided extruded bodies 41A to 41A
1C and each split extruded body 41A-41C
It comprises push cylinders 42A to 42C that move.
ing. The consolidation passage 32 is provided with an ash pusher 40 .
Length L = 1 from the projecting end position of the divided extruded bodies 41A to 41C
Within the range of 00 mm to 200 mm, these divided pressing bodies 41
A-41C is formed in a straight shape with a rectangular cross section which is the same as or slightly larger than the front shape of the expansion passage portion 33.
Means that the top wall 33a is at an angle θs =
The side wall 33b is formed in a tapered shape extending right and left at an angle θu of 5 to 30 degrees while extending upward by 5 to 30 degrees, so that the preheating chamber 19 is configured to be continuous. Here, the length L of the consolidation passage 32 is 100 mm to 2 mm.
The reason why the thickness was set to 00 mm is that when L is less than 100 mm, incineration ash G
Is sent out to the preheating chamber 19 without being consolidated, and when L exceeds 200 mm, the consolidation becomes large, the solidification is liable to occur, and there is a risk of clogging. The reason why the expanding passage portion 33 is formed in a tapered shape is to take out the compacted incineration ash G smoothly.

In the above configuration, the incinerated ash G supplied to the ash supply hopper 13 is supplied to the push cylinder 42 at the bottom.
A-42C
The projecting bodies 41A to 41C are sent out to the consolidation passage 32 of the ash supply port 31 by the projecting movement of the incineration ash G in the preheating chamber 19.
Of the incineration ash G after the pressurization is performed smoothly in the expansion passage portion 33, and the preheated chamber 19 is compressed.
Supplied to

Accordingly, it is possible to consolidate to a uniform density with a substantially uniform pressure without being largely influenced by the amount of ash deposited in the ash supply hopper 13 and the amount of incinerated ash G already deposited in the preheating chamber 19. And a constant amount of ash can be supplied into the furnace. Further, the sealing function can be exerted by the incinerated ash G compacted in the compacting passage portion 33, and the inflow and outflow of outside air and combustion gas between the preheating chamber 19 and the ash supply hopper 13 can be prevented. Ash can be efficiently melted by preventing the temperature inside the furnace body 21 from lowering. Further, the incinerated ash G which has been compacted and solidified enables smooth feeding in the preheating chamber 19 and the melting chamber 18 and reduces the amount of ash scattered in the furnace body 21 and accompanies the combustion gas. The amount of fly ash discharged can also be significantly reduced. Furthermore, the adjacent divided pressing bodies 41A to 41C
It is similar by being moved in and out separately at different times
Ash G is compacted to a nearly constant density in the compaction passage 32
To the preheating chamber 19, and the atmosphere in the furnace
Can be suppressed.

FIG. 3 shows a case in which the above-mentioned ash supply device is provided in a parallel flow type, and the same members are denoted by the same reference numerals and description thereof will be omitted. Although the consolidation passage 32 is formed in a straight shape in the above-described embodiment, the length thereof may be shortened by forming the consolidation passage 32 into a tapered shape with a taper.

[0017]

As described above, according to the present invention, when the ash is supplied from the ash supply hopper into the furnace through the consolidation passage of the ash supply port, the ash is pressed against the divided extruded body of the ash pusher. The ash is extruded into the furnace while being compacted, so it is compressed and consolidated at almost constant pressure without being affected by the amount of ash deposited in the ash supply hopper or the amount of ash already deposited in the furnace, and it is always constant A quantity can be fed into the furnace. Also,
Due to the ash compacted in the compaction passage, the inflow and outflow of outside air and combustion gas between the inside of the furnace and the ash supply hopper can be prevented, and the temperature inside the furnace can be prevented from lowering. Furthermore, the ash solidified by consolidation allows smooth movement in the preheating chamber and melting chamber in the furnace, reduces the amount of ash scattered in the furnace, and discharges ash accompanying the combustion gas. The amount can be greatly reduced. Furthermore, multiple split extruded bodies
As it moves in and out after a short time, fluctuations in the furnace atmosphere
It can be suppressed and stable operation becomes possible.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional view showing one embodiment of a countercurrent burner type ash melting furnace according to the present invention.

FIG. 2 is a plan sectional view showing an ash supply port of the ash melting furnace.

FIG. 3 is a central longitudinal sectional view showing one embodiment of a co-current burner type ash melting furnace according to the present invention.

FIG. 4 is a central longitudinal sectional view showing a conventional cocurrent burner type ash melting furnace.

FIG. 5 is a central longitudinal sectional view showing a conventional countercurrent burner type ash melting furnace.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Furnace main body 2 Melting chamber 3 Ash supply hopper 5 Slag removal outlet 9 Melting burner 11 Furnace main body 13 Ash supply hopper 13a Ash supply port 15 Slag removal outlet 18 Melting chamber 19 Preheating chamber 20 Melting burner 31 Ash supply port 32 Consolidation passage 33 Expanding passage 40 Ash pusher 41A-41C Split extruded body 42A-41C Push cylinder G Incineration ash S Molten slag

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Michio Ishida 5-28 Nishikujo, Konohana-ku, Osaka-shi, Japan Within Hitachi Zosen Corporation (72) Inventor Tsutomu Kuwahara 5-chome, Nishikujo, Konohana-ku, Osaka-shi, Osaka No. 3-28 within Hitachi Zosen Corporation (72) Inventor Tadashi Kono 5-28 Nishikujo, Konohana-ku, Osaka-shi, Osaka-ken Within Hitachi Zosen Corporation (56) References JP-A-50-144274 (JP, A ) JP-A-2-302512 (JP, A)

Claims (2)

(57) [Claims] 1. An ash supply port is provided at an upstream end in a furnace.
At the outlet of the ash supply hopper, push the ash pusher extruded
The ash from the ash supply hopper is supplied to the ash melting furnace
When the extruded body is divided into multiple parts in the width direction during feeding
The ash supply hopper is driven out of phase
Ash into a cross section approximately the same as the front cross section of the extruded body at the ash supply port
While being consolidated through the formed consolidation passage,
A method for supplying ash in a burner type ash melting furnace, wherein the ash is continuously extruded . An ash supply hopper is disposed at an upstream end of the furnace through an ash supply port, and an ash pusher is provided at the bottom of the outlet of the ash supply hopper so that the extruded body can be extended and retracted to the ash supply port side. In the furnace, at the ash supply port, a consolidation passage portion having substantially the same cross section as the front cross section of the extruded body is formed in a range of a predetermined length from the projecting end position of the extruded body to the outlet side, and the extruded body is formed in the width direction. With multiple extruded parts
And push each extruded body separately
The cylinders are configured to be able to move back and forth, and the driving timing of each of the push cylinders is shifted to reduce ash.
An ash supply device in a burner type ash melting furnace, wherein the ash supply device is configured to be continuously fed .