JPH062831A - Ash melting furnace - Google Patents

Abstract

PURPOSE:To heat ash efficiently and reduce the amount of flying ash, accompanied by the exhaust gas of combustion, remarkably by a method wherein a communicating space between a preheating chamber and a heating chamber is choked and the extracting port of exhaust gas of combustion at the side of the preheating chamber is provided at a position apart from the end wall of one end of a furnace main body. CONSTITUTION:A communicating space 7 between a preheating chamber 5 and a melting chamber 6 in a furnace main body 2 is choked and narrowed. The upper wall 2d of the preheating chamber 5 side of the communicating space 7 is slanted so as to be spread upwardly whereby a pressure loss, generated at the choked part, is considered so as to be reduce. The extracting port 8 of the exhaust gas of combustion is formed at a position apart from an end wall unit 2b, positioned at the upper wall unit 2d of the preheating chamber 5 and provided with a throwing port 3, by a predetermined distance (L) while an exhaust gas extracting pipe 9 is connected to the extracting port 8. According to this method, radiation heat from a heating burner is not radiated against the side of the preheating chamber while the exhaust gas of combustion, which flows toward the preheating chamber, is collided once against the end wall part of the side of a throwing port and, thereafter, is extracted out of the extracting port 9 of the exhaust gas of combustion. The ash constituents, included in the exhaust gas are dropped at that time and whereby the amount of flying ash accompanied by the exhaust gas can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ash melting furnace for melting incineration ash discharged from, for example, an incinerator for municipal waste or an incinerator for industrial waste.

[0002]

2. Description of the Related Art Conventionally, for example, there is an ash melting furnace in which incinerator ash discharged from an incinerator for municipal solid waste is melted and solidified to heat it with a burner in order to reduce the volume and render it harmless.

By the way, the bottom wall of the furnace body of this conventional ash melting furnace is arranged so as to incline downward from the incineration ash charging side toward the molten ash discharging side, and a burner for heating is provided. The obtained melting chamber was arranged on the discharge side, and an exhaust gas extraction pipe for extracting the combustion exhaust gas generated in the melting chamber to the outside was connected and opened to the upper wall portion of the preheating chamber on the charging side of the furnace body.

Therefore, in the above structure, the incinerated ash charged into the furnace body from the ash charging hopper is melted in the preheating chamber while moving to the discharge side on the bottom wall surface of the furnace body provided downward. It is preheated (dried and heated) by the combustion exhaust gas flowing from the chamber. Then, this preheated incinerated ash moves to the melting chamber, is heated and melted by a burner provided on the melting chamber side, and is then dropped from the molten ash discharge port formed on the discharge side into a cooling tank and cooled. It was solidified.

On the other hand, the combustion exhaust gas flows in the direction opposite to the incineration ash moving downward from the charging side to preheat the incineration ash charged from the charging hopper, and then the end wall of the charging side of the furnace body. Combustion exhaust gas was being discharged to the outside from an exhaust gas extraction pipe opened at the upper wall at a position immediately beside it.

[0006]

According to the configuration of the above-mentioned conventional ash melting furnace, the preheating chamber and the melting chamber in the furnace body are
Since they are connected in a space that is almost straight, the radiant heat of the burner flame goes to the preheating chamber side, and there is the problem that the heat from the burner flame is not used for sufficient melting, and the exhaust gas extraction pipe is the main body of the furnace. Since there is an opening right beside the end wall of the exhaust gas, there is a problem that the combustion exhaust gas reaches the exhaust gas extraction pipe as it is, and therefore a considerable amount of ash is mixed in the exhaust gas taken out from the exhaust gas extraction pipe.

Therefore, an object of the present invention is to provide an ash melting furnace which can solve the above problems.

[0008]

In order to solve the above problems, an ash melting furnace of the present invention is an ash melting furnace that heats and melts ash by a burner, and has an ash charging port at one end side. The bottom wall of the furnace body that is formed and has a molten ash discharge port formed on the other end side is provided so as to incline downward from one end side toward the other end side, and at a position near one end in this furnace body In addition to forming a preheating chamber for ash, a melting chamber in which a heating burner is provided near the other end is formed, and the communication space between the preheating chamber and the heating chamber in the furnace body is narrowed, and The intake port for the combustion exhaust gas provided on the preheating chamber side is provided at a position separated from the end wall portion on one end side of the furnace body.

[0009]

With the above structure, since the communication space between the preheating chamber and the melting chamber in the furnace body is narrowed down, the radiant heat from the heating burner is radiated to the preheating chamber side. This is prevented and thus the ash is efficiently heated in the melting chamber.

Further, since the combustion exhaust gas outlet is provided apart from the end wall portion of the furnace body, the combustion exhaust gas flowing from the melting chamber side to the preheating chamber side through the communication space portion is once charged. After colliding with the end wall portion on the mouth side, the momentum is reduced, that is, after detouring, the ash contained in the combustion exhaust gas falls when detouring because it is discharged from the outlet. That is, the amount of fly ash accompanying the combustion exhaust gas can be greatly reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, reference numeral 1 denotes an ash melting furnace for heating and melting ash by a burner, and a bottom wall portion 2a of a furnace body 2 thereof is provided so as to be inclined downward from an ash input side to an ash discharge side.

An ash inlet 3 is formed in the end wall portion 2b on one end side of the furnace body 2, and the end wall portion 2c on the other end side is formed.
A molten ash discharge port (also referred to as a slag port) 4 is formed in the furnace, and an ash preheating chamber 5 is formed near the charging port 3 inside the furnace body 2 and at the part near the discharge port 4. Has a melting chamber 6 for heating and melting the ash, and a communication space 7 between the preheating chamber 5 and the melting chamber 6 in the furnace body 2 is narrowed and narrowed. Further, the upper wall portion 2d of the communication space portion 7 on the side of the preheating chamber 5 is designed so as to spread upward, that is, be inclined upward so that the pressure loss generated at this throttle portion becomes small.

A heating burner 11 for heating ash is attached to the upper wall 2d on the melting chamber 6 side, and the upper wall 2d of the preheating chamber 5 and the charging port 3 are formed. A combustion exhaust gas outlet port 8 is formed at a position separated from the end wall portion 2b by a predetermined distance (L), and an exhaust gas outlet pipe 9 is connected to the outlet port 8.

An ash charging hopper 12 for charging ash is connected to the charging port 3 of the furnace body 2, and the ash charging hopper 12 is provided at the bottom of the ash charging hopper 12. An extruding device 13 is provided for extruding the ash of No. 2 into the furnace body 2.

The push-out device 13 is provided with a push-out member 14 which is provided so as to be able to move in and out of the furnace body 2 from the charging port 3 side.
And a cylinder device 1 for moving the pushing member 14 back and forth.
It is composed of 5 and.

A cooling tank 21 for cooling the molten ash discharged from the discharge port 4 is arranged at a lower portion of the furnace main body 2 corresponding to the discharge port 4. A scraping conveyor 22 is arranged to scrape out the ash (slag) that is solidified by cooling the ash.

In FIG. 1, reference numeral 31 is a combustion air supply port for supplying combustion air to the heating burner 11.
Therefore, in the above configuration, the incinerated ash A charged into the furnace main body 2 from the ash charging hopper 12 through the extrusion device 13 is preheated by the combustion exhaust gas B flowing from the melting chamber 6 through the communication space portion 7 ( While being dried and heated), it moves from the preheating chamber 5 to the melting chamber 6 side, and
Inside, it is heated to a high temperature and melted by the heating burner 11.

The molten ash, that is, molten ash (molten slag) C is discharged from the discharge port 4 into the cooling tank 21, cooled and solidified therein, and taken out by the scraping conveyor 22 to the outside. .

According to this structure, since the communication space 7 between the preheating chamber 5 and the melting chamber 6 in the furnace body 2 is narrowed down, the radiant heat from the heating burner 11 is on the preheating chamber 5 side. To the melting chamber 6
The incineration ash is efficiently heated in the inside.

Further, the combustion exhaust gas outlet 8 is provided in the furnace main body 2.
Since it is provided at a certain distance (L) from the end wall portion 2b of FIG. 1, the flow from the melting chamber 6 side to the preheating chamber 5 side via the communication space portion 7 is shown as indicated by the dashed line arrow in FIG. The combustion exhaust gas B that has come in once collides with the end wall portion 2b on the injection port 3 side, and after its momentum is reduced, that is, after detouring, the combustion exhaust gas B is exhausted from the exhaust gas extraction pipe 9, so that The contained ash drops when it detours. That is, the amount of fly ash accompanying the combustion exhaust gas can be greatly reduced.

[0021]

As described above, according to the configuration of the present invention, since the communication space between the preheating chamber and the melting chamber is narrowed, the radiant heat from the heating burner is directed to the preheating chamber side. As it is not radiated, the ash is efficiently heated in the melting chamber.

Further, the combustion exhaust gas flowing from the melting chamber side to the preheating chamber side through the communication space portion once collides with the end wall portion on the charging port side, passes through the bypass path, and then the combustion exhaust gas outlet port. Since it is taken out from the exhaust gas, the ash contained in the combustion exhaust gas falls at the time of bypassing it, and therefore the amount of fly ash accompanying the combustion exhaust gas can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a schematic configuration of an ash melting furnace in an embodiment of the present invention.

[Explanation of symbols]

 1 Ash Melting Furnace 2 Furnace Main Body 2a Bottom Wall 2b End Wall 2d Top Wall 3 Input Port 4 Discharge Port 5 Preheating Room 6 Melting Chamber 7 Communication Space Section 8 Outlet 11 Heating Burner 12 Ash Loading Hopper

Claims (1)

[Claims] 1. An ash melting furnace for heating and melting ash by a burner, the furnace main body having an inlet for ash injection formed at one end and an outlet for molten ash formed at the other end. The bottom wall of the furnace is inclined downward from one end side to the other end side, an ash preheating chamber is formed at a position near one end in the furnace body, and a heating burner is provided at a position near the other end. Of the combustion exhaust gas provided on the preheating chamber side of the furnace main body, and the one end side of the furnace main body. An ash melting furnace, which is provided at a position apart from the end wall of the ash.