JPH02302512A - Incineration ash melting method and device therefor - Google Patents

Abstract

PURPOSE:To efficiently recover the heat of combustion gas and use it effectively for reducing the running cost considerably by a method wherein incineration ash is charged into a melting furnace after granulated, and exhaust combustion gas of a melting burner is induced toward the granulated ash charging side to pre-heat the granulated ash. CONSTITUTION:Incineration ash A supplied from an ash hopper 20 to an ash granulating unit 8 is granulated into granular ash pellets A1 and fed into a pre-heating compartment 6 through a pellet feed pipe 10 by a pellet feeder 9. The ash pellets A1 filled in the pre-heating compartment 6 is sent toward a melting chamber 3 side by a pusher 11. Primary combustion exhaust gas D1 is introduced from a melting burner 2 to the pre-heating compartment 6, passes through the clearances between the ash pellets, and discharged through a first exhaust gas pipe 7A after efficiently pre-heating not only the upper portion of the pile of the ash pellets A1 but also the inside of the pile. The ash pellets A1 are heated by the melting burner 2 in the melting chamber, turned into molten slag B, and discharged together with secondary combustion exhaust gas D2 from a slag outlet 4 into a slag cooling chamber 5.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method and apparatus for melting waste incineration ash, which reduces the volume by heating and melting waste incineration ash discharged from a waste incinerator or the like using a burner to solidify the waste incineration ash. Regarding.

Conventional technology A bar-type melting device that melts and solidifies incinerated ash discharged from a garbage incinerator to reduce its volume and render it harmless has conventionally been used to transport ash from an ash hopper 102 to a melting furnace 1 as shown in FIG.
The incinerated ash A put into the upstream side of the 0G melting chamber 101 is sent to the downstream side by the pusher device 103, and
The incinerated ash A is heated to, for example, 1300° C. or higher and melted by a melting burner 104 arranged on the top wall of the slag, and the molten slag B is flowed together with the combustion exhaust gas D from the exhaust port 105 to the slag cooling chamber 106, where it is solidified. are doing. The combustion exhaust gas D flowing into the slag cooling chamber at this time is introduced into the air preheater 107 via the exhaust gas pipe 108, heats the combustion air C supplied to the melting burner, and is then discharged into the atmosphere. Ta.

Problems to be Solved by the Invention According to the above conventional configuration, for example, garbage incineration ash discharged from cities is heated to about 1300° C. or higher and melted, but the exhaust heat of the combustion exhaust gas D from the melting burner 104 is In the air preheater, it was used only for heating the combustion air C of the melting burner 104, which was extremely wasteful.

An object of the present invention is to provide a method and apparatus for melting incinerated ash, which can efficiently recover and effectively utilize the exhaust heat of combustion exhaust gas, and can significantly reduce running costs.

Means for Solving the Problems In order to solve the above problems, the incineration ash melting treatment method of the present invention uses a melting furnace equipped with a melting burner to heat and melt the incineration ash and discharge the molten slag. The ash is granulated and put into a melting furnace, and the combustion exhaust gas from the melting burner is drawn to the granular incinerated ash input side to preheat the granular incinerated ash.

The incinerated ash melting device is equipped with a melting burner in the melting chamber of the melting furnace, and the incinerated ash is melted by the melting burner and the molten slag is discharged into the slag cooling chamber. A granulating device for granulating incinerated ash and a preheating chamber for preheating the granulated incinerated ash are provided between the melting chamber, and an exhaust gas pipe for attracting combustion exhaust gas is connected to the preheating chamber. Incineration ash melting processing equipment.

Effects According to the above configuration, the induced combustion exhaust gas passes through the granular incinerated ash to the middle and lower layers, and evenly preheats the incinerated ash, so thermal efficiency can be greatly improved. The amount of heat supplied to the melting burner can be reduced, reducing running costs.

Example An embodiment of the present invention will be described below with reference to FIG.

Reference numeral 1 denotes a melting furnace that heats and melts waste incineration ash A using a melting burner 2 to form molten slag B. The melting burner 2 is disposed on the top wall 1a of the melting chamber 3 on the downstream side, and the bottom wall A slag outlet 4 is formed in 1b, and a slag cooling chamber 5 is provided below the slag outlet 4. On the upstream side of the melting chamber 3, there is formed an L-shaped preheating chamber 6 which is inclined upward on the upstream side and further bent upward, and the upper end of the preheating chamber 6 accounts for most of the combustion exhaust gas. First combustion exhaust gas D1
A first exhaust gas pipe 7A is connected to the exhaust gas pipe 7A.

In addition, the upper part of the preheating chamber 6 and the ash hopper 2 that supplies the incinerated ash A
An ash granulator 8 is interposed between the ash granulator 8 and the ash granulator 8.
A pellet supply pipe 10 is connected to the discharge port of the pellet feeder 9 via a pellet feeder 9. Then, the incinerated ash A supplied from the ash hopper 18 is formed into granular ash pellets A1 of an appropriate size by the ash granulator 8, and fed into the preheating chamber 6 from the pellet supply pipe 10 by the pellet feeder 9. The ash aggregation device 8 is selected to be of a type that can efficiently granulate the waste incineration ash A to an appropriate size.

A pusher device 11 for transferring the ash pellets A1 to the downstream side is disposed at the lower end corner of the preheating chamber 6, and a pusher member 11a is moved along the bottom wall 1a of the preheating chamber 6 by a pusher cylinder 11b. Enter and exit the pellet supply pipe 1
The ash pellets A1 introduced from 0 are moved to the melting chamber 3111.

A cyclone type collector 12 is provided in the first exhaust gas pipe 7A.
is used to remove dust in the first combustion exhaust gas D1. The dust collected by the dust collector 12 is returned to the downstream side of the preheating chamber 6 by a dust feeder 13 via a dust return pipe 14.

In addition to the molten slag B, the slag cooling chamber 5 also contains a second combustion exhaust gas D, which is a part of the combustion exhaust gas of the melting burner 2.
2 is introduced, and a second exhaust gas pipe 7B that discharges this second combustion exhaust gas D2 is connected to the slag cooling chamber 5. This prevents the molten slag B from being cooled and condensed and blocking the slag extraction port 4. The first exhaust gas pipe 7A and the second exhaust gas pipe 7B, which discharge the first combustion exhaust gas D1 from the dust collector 12, are combined and introduced into the air preheater 15, and then discharged to the atmosphere. Further, the air supply pipe 17 connected to the discharge side of the air fan 1G is connected to the air preheater 15.
It is connected to the melting burner 2 via. Reference numeral 18 indicates an air i adjustment damper disposed at the outlet of the air supply pipe 17, and 19 indicates an exhaust gas regulation damper disposed at the second exhaust gas pipe 7B.

Next, the effect will be explained.

The incinerated ash A supplied from the ash hopper 20 to the ash granulator 8 is formed into granular ash pellets A1, and is fed into the preheating chamber 6 by the pellet feeder 9 via the pellet supply pipe 10. The ash pellet A1 is filled into the preheating chamber 6 as shown in FIG. The ash pellets A1 pass through the gaps between the granular ash pellets A1, effectively preheating the ash pellets A1 not only from the upper layer but also from the inside, and are discharged from the first exhaust gas pipe 7A.

In the melting chamber 3, the ash bead A1 is heated by the melting burner 2 to become molten slag B, which is discharged from the slag outlet 4 to the slag cooling chamber 5 together with the second combustion exhaust gas D2.

The first combustion exhaust gas D1 discharged from the first exhaust gas pipe 7A is combined with the second combustion exhaust gas D2 of the second exhaust gas pipe 7B after the entrained incineration ash A dust is collected in the dust collector 12. The combustion air C is introduced into the air preheater 15, heated, and then discharged to the atmosphere.

The collected dust is returned to the preheating chamber 6 by the dust feeder 13 via the dust return pipe 14.

Effects of the Invention As described above, according to the present invention, the incinerated ash is granulated and introduced into the preheating chamber, and the combustion exhaust gas of the melting burner is passed through the granular incinerated ash and attracted, so that the granular incineration in the preheating chamber is reduced. It is possible to effectively preheat all the way to the bottom layer of ash, making the preheating chamber more compact than when heating only the surface layer. Therefore, thermal efficiency can be improved, the amount of heat supplied by the melting burner can be reduced, and running costs can be significantly reduced.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram showing the melt processing apparatus of the present invention, Fig. 2
The figure is a schematic configuration diagram showing a conventional melt processing apparatus. A... Incineration ash, A1... Ash pellet, B... Molten slag, Dl... First combustion exhaust gas, D2... Second combustion exhaust gas, 1... Melting furnace, 2... Melting burner, 3.
... Melting chamber, 4... Slag extraction port, 5... Slag cooling chamber, 6... Preheating chamber, 7A... First exhaust gas pipe, 7B
...Second exhaust gas pipe, 8...Ash granulator, 20...
Ash hopper.

Claims (1)

[Claims] 1. When heating and melting incinerated ash and discharging molten slag using a melting furnace equipped with a melting burner, the incinerated ash is granulated and charged into the melting furnace, and the combustion exhaust gas of the melting burner is A method for melting incinerated ash characterized by preheating granular incinerated ash by attracting it to the granular incinerated ash input side. 2. In the incinerated ash melting processing equipment, which is equipped with a melting burner in the melting chamber of the melting furnace, and which melts the incinerated ash and discharges the molten slag into the slag cooling chamber, the incinerated ash is placed between the ash input hopper and the melting chamber. An incinerated ash melting processing device comprising: a granulating device for granulating ash; a preheating chamber for preheating the granulated incinerated ash; and an exhaust gas pipe for drawing combustion exhaust gas connected to the preheating chamber. .