JPH0419311Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an improvement of a melting furnace for melting incineration ash, garbage, etc.

(Prior Art) Generally, most of the incinerated ash produced from garbage incinerators, sludge incinerators, etc. is disposed of in landfills. However, it is becoming more and more difficult to secure a landfill site year by year, and heavy metals are leached in the landfill, so there is a need to reduce the volume of incinerated ash, use it effectively, and prevent the leaching of heavy metals in the ash.

Therefore, in recent years, based on such a request, incineration ash has been melted using a melting furnace and taken out as slag.

That is, incinerated ash thrown into the furnace from a hopper is melted by a gas burner or an oil burner to form slag, which is dropped into water from a slag discharge port to be rapidly cooled and solidified, and then taken out by a water seal conveyor.

Therefore, the volume of the incinerated ash will be reduced.
In addition, even if the incineration ash contains various miscellaneous items such as metals, ceramics, glass, and unnatural materials, when the incineration ash becomes slag, it becomes a black, glassy homogeneous substance, which prevents the elution of heavy metals. No concrete aggregate,
It can be reused as roadbed material, etc.

The same can be said about the melting and burning of garbage and sludge.

However, in the case of conventional melting furnaces, if the incineration ash contains metals, the slag containing these metals becomes icicle-like when it falls into the water from the slag discharge port, and this gradually grows and forms a large amount. slag may fall into the water all at once. At this time,
There was a problem that a large amount of steam was generated, creating a hydrogen bomb condition, causing the burner to blow out. In addition, there were problems with safety, such as evaporation blowing out from the conveyor.

(Problems to be solved by the invention) This invention was devised to solve the above problems, and its purpose is to cut the slag that becomes icicle-like at the slag discharge port of the melting furnace. The object of the present invention is to provide a melting furnace capable of inhibiting growth.

(Means for Solving the Problems) The present invention is arranged below the north part 11 of the slag discharge port 10 of the melting furnace 1 for melting incinerated ash, garbage, sludge, etc. and a cutter body 14 made of a water-cooled pipe having a length slightly shorter than the width of the slag discharge port 10; and a drive device 1 for periodically moving the cutter body 14 forward and backward.
The basic idea of the invention is that a slag cutter 5 is provided to cut the hot and soft root part of the slag 9, which is formed from the north part 5 and hangs downward from the tip of the north part 11, into pieces with the cutter body 14. The structure is as follows.

(Function) The incinerated ash put into the hopper of the melting furnace is fed into the furnace in fixed amounts by a feed pusher or the like.

Incineration ash supplied into the furnace is melted by a gas burner or the like and becomes slag.

The slag hangs down from the slag discharge port in an icicle shape. The cutter body located below the north part of the slag discharge port is periodically moved forward and backward to tear off the hot and soft root part of the slag that hangs down in an icicle shape. Cut it inside and let it fall into the water. Therefore, the slag does not become large icicles and fall into the water, and a large amount of steam can be prevented from being generated.

The slag that has fallen into the water is rapidly cooled and solidified, and then taken out by a water seal conveyor.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

1 and 2 show a melting furnace 1 according to an embodiment of the present invention, and the melting furnace 1 is composed of a furnace body 2, a supply pusher 3, a burner 4, a slag cutter 5, and the like.

The furnace body 1 is equipped with a hopper 7 for charging incinerated ash 6, a furnace bottom 8 for placing incinerated ash 6 in layers, a slag discharge port 10 for discharging slag 9, etc. A north portion 11 protruding toward the slag discharge port 10 is formed in the furnace bottom 8 near the slag discharge port 10 .

The supply pusher 3 feeds the incinerated ash 6 put into the hopper 7 into the furnace in a fixed amount, and reciprocates between the pusher 12 which is disposed below the hopper 7 so as to be able to reciprocate. It consists of a fluid pressure cylinder 13 and the like.

The burner 4 is provided on the ceiling of the furnace body 2, and a gas burner, an oil burner, or the like is used for the burner 4.

The slag cutter 5 is attached to the north part 1 of the furnace bottom 8.
The slag 9 that hangs down in an icicle shape from 1 is cut into pieces (or scraped pieces), and is made with a cooling pipe.
The cutter body 14 includes a cutter body 14 that is reciprocatably disposed at a position below the cutter body 1, and a drive device 15 such as a fluid pressure cylinder that makes the cutter body 14 reciprocate. The cutter body 14 is constantly cooled by circulating cooling water 16 inside it. Further, the fluid pressure cylinder 17 is driven and controlled by a timer or the like so that the cutter body 14 periodically reciprocates in the direction of the arrow in FIG.

On the other hand, a water seal tank 17 storing water is installed below the slag discharge port 10 of the melting furnace 1.
Slag 9 in the furnace is configured to fall into water from a slag discharge port 10. In addition, a flight conveyor 18 is installed in the water seal tank 17 to transport the slag 9 that has fallen into the water seal tank 17 to the outside of the water seal tank 17, and this flight conveyor 18 circulates in the direction of the arrow in FIG. The drive is controlled by a drive device (not shown) so as to do so.

In addition, in Fig. 2, 19 is an air preheater, 20
is a forced draft fan, and 21 is a duct.

The incinerated ash 6 put into the hopper 7 is supplied into the furnace in a fixed amount by the reciprocating movement of the pusher 12.

The incinerated ash 6 supplied into the furnace forms a mountain-shaped layer at the furnace bottom 8 according to its shape, and the surface of this layer is melted by the burner 4 to form a slag layer.

The molten slag 9 hangs down from the north part 11 of the furnace bottom 8 in an icicle shape and falls into the water seal tank 17. At this time, the cutter body 14 falls periodically. At this time, the cutter main body 14 periodically reciprocates in the direction of the arrow in FIG. 1, cuts the icicle-like slag 9 into small pieces (or scrapes), and drops them into the water. .

Then, the slag 9 that has fallen into the water is rapidly cooled and solidified, and then transferred to the water sealing tank 1 by the flight conveyor 18.
7 Taken out.

On the other hand, the combustion gas 22 inside the furnace flows in the direction of the arrow as shown in FIG. 2, passes through the air preheater 19, and is discharged to the outside of the furnace. Moreover, the air preheated by the air preheater 19 is supplied to the burner 4 and used as combustion air.

(Effect of the invention) As described above, the present invention provides a cutter body made of water-cooled pipe having a length slightly shorter than the width of the slag discharge port below the north part of the slag discharge port of the melting furnace, and the cutter body By moving the slag forward and backward periodically, the hot and soft part of the icicle-like hanging slag is torn off over its entire width, and this is dropped into the water. Therefore, the cutter body is not affected by the weight of the slag flowing down from above, and can smoothly and reliably cut the icicle-like slag with less power. It is possible to prevent the generation of a large amount of steam without forming large icicles and falling into the water. As a result, there is no burner blow-out, and the melting furnace can be operated continuously for a long period of time, improving operational efficiency.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical side view of a melting furnace according to an embodiment of the present invention, and FIG. 2 is a schematic vertical front view thereof. 1 is a melting furnace, 5 is a slag cutter, 9 is a slag, and 10 is a slag discharge port.

Claims (1)

[Scope of utility model registration request] The slag discharge port 10 of the melting furnace 1 for melting incineration ash, garbage, sludge, etc. is disposed below the north portion 11 of the slag discharge port 10 and has a length slightly shorter than the width of the slag discharge port 10. A cutter body 14 made of a water-cooled pipe; and a drive device 15 that periodically moves the cutter body 14 forward and backward. A melting furnace characterized in that a slag cutter 5 is provided for cutting the slag into pieces by the cutter body 14.