JPH0810053B2 - Ash melting furnace - Google Patents

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.

The bottom wall of the furnace body of this conventional ash melting furnace is
The melting chamber provided with a burner for heating is arranged on the discharge side while being arranged so as to incline downward from the input side of the incinerated ash toward the discharge side of the molten ash, and due to the combustion exhaust gas generated in the melting chamber. A preheating chamber that preheats (drys and heats) the incinerated ash that has been input is disposed on the input side, and further, an ash input hopper and an ash extrusion device are disposed on the input side.

Therefore, the incinerated ash charged into the furnace body by the extruder from the ash charging hopper is discharged from the melting chamber in the preheating chamber while moving to the discharge side on the bottom wall surface of the inclined furnace body. It is preheated (dried and heated) by the flowing flue gas. 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.

By the way, the upper surface of the bottom wall portion of the conventional furnace body is lined with a refractory material, and the ash extruding device pushes out only a part of the opening below the ash charging hopper. I was told. For example, it is disclosed in Japanese Patent Laid-Open No. 2-298716.

[0006]

However, as described above, since the upper surface of the bottom wall of the furnace body is lined with the refractory material, for example, when ash sintering occurs on the preheating chamber side. In addition, there has been a problem that it sticks to the bottom wall side.

Further, since the ash is extruded by the extruder from a part of the opening portion of the ash charging hopper, the ash is not always extruded in the order in which the ash was first charged into the hopper, and the ash is cooled after being cooled. There is a problem that ash or wet ash may enter the furnace body, and thus the atmosphere in the furnace body cannot be maintained in a stable state.

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

[0009]

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 the ash melting furnace is provided on one end side of the furnace body. An inlet for ash injection is formed, and an outlet for molten ash is formed on the end wall portion on the other end side, and the bottom wall portion of this furnace main body is inclined downward from one end side to the other end side. , A ash preheating chamber is formed at a position near one end in the furnace body, and a melting chamber provided with a heating burner is formed at a position near the other end, and at least the bottom wall portion on the preheating chamber side is formed by a cooling member. An ash charging hopper communicating with the charging port is provided, and the ash in the ash charging hopper is extruded into and out of the furnace main body from the charging port and extruded from the charging port into the preheating chamber. It is equipped with a device.

[0010]

With the above structure, the ash supplied from the ash charging hopper into the furnace body is sequentially supplied from the bottom of the ash charging hopper through the charging port by the extruder. It is possible to prevent cold ash and moist ash that are thrown in later from entering the preheating chamber.

Further, since the cooling member is used as the floor material of the bottom wall portion on the preheating chamber side, even if the ash is sintered, it does not adhere to the surface of the bottom wall portion.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 1 denotes an ash melting furnace for heating and melting ash by a burner, and a bottom wall portion 3 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 11 is formed in the end wall portion 4 on one end side of the furnace body 2, and a molten ash discharge port (also referred to as a slag port) 12 is formed on the end wall portion 5 on the other end side. Is formed, and in the portion of the furnace body 2 near the charging port 11,
A preheating chamber 7 for ash is formed, and a melting chamber 8 for heating and melting ash is formed near the discharge port 12. Further, the preheating chamber 7 and the melting chamber 8 in the furnace body 2 are connected to each other. The communication space portion 9 is narrowed and narrowed.

The preheating chamber 7 and the melting chamber 8 of the furnace body 2 are
A step 10 is provided on the bottom wall portion 3 at the boundary between and so that the melting chamber 8 side is slightly lower. The bottom wall portion 3 is a bottom wall portion on the side of the melting chamber 8 while being constituted by a water cooling pipe (an example of a cooling member, which may be, for example, a water cooling jacket) 21 arranged over the whole. The upper surface of the water cooling pipe 21 of the melting side bottom wall portion 3b is provided with a tining 22 made of a refractory material.

The inclination angle of the preheating side bottom wall portion 3a, which is the bottom wall portion on the preheating chamber 7 side, is set smaller than the friction angle of ash (for example, about 10 to 25 degrees), and the melting side In the bottom wall portion 3b, the inclination angle of the portion closer to the outlet is slightly larger than the inclination angle of the portion closer to the inlet.

A heating burner 31 for heating ash is attached to the upper wall portion 6 on the melting chamber 8 side, and a charging port 11 is formed in the upper wall portion 6 of the preheating chamber 7. A combustion exhaust gas outlet 13 is formed at a position separated from the end wall portion 4 by a predetermined distance.

Further, an ash charging hopper 1 for charging ash is provided at a position corresponding to the charging port 11 of the furnace body 2.
5 is connected and provided at the bottom of the ash charging hopper 15 with an extruding device 16 for pushing the ash in the ash charging hopper 15 into the furnace body 2 through the charging port 11. ing.

That is, the extrusion device 16 is arranged at the bottom of the ash charging hopper 15 and the charging port 11
It is composed of an extruding member 17 which is provided so as to be able to move in and out of the furnace body 2, and a cylinder device 18 which causes the extruding member 17 to move in and out.

A cooling tank 32 for cooling the molten ash discharged from the discharge port 12 is arranged at a lower portion of the furnace body 2 corresponding to the discharge port 12. A scraping conveyor 33 is arranged to scrape out the ash (slag) that is solidified by cooling the ash.

Therefore, in the above-mentioned structure, when the pushing member 17 of the pushing device 16 is pushed back and forth by the cylinder device 18, the incinerated ash A at the bottom of the ash feeding hopper 15 is sequentially fed into the preheating chamber 7 through the feeding port 11. To be done.

The extrusion rate of the ash by the extrusion device 16 is set so that the surface melting of the incinerated ash does not start before the incinerated ash reaches the inlet of the melting chamber 8.

Then, from the inlet 11 to the preheating side bottom wall portion 3a
The incineration ash A supplied above is from the melting chamber 8 to the communication space 9
It is preheated (dried and heated) by the combustion exhaust gas flowing through.

The incineration ash A preheated in the preheating chamber 7 moves to the melting chamber 8 side through the communication space 9 and is heated to a high temperature by the heating burner 31 in the melting chamber 8 to be melted. Then, the molten ash, that is, the molten ash (molten slag) B
Is discharged from the discharge port 12 into the cooling tank 32, where it is cooled and solidified, and taken out as slag by the scraping conveyor 33.

As described above, the incinerated ash A supplied from the ash charging hopper 15 into the furnace body 2 is passed through the charging port 11 by the pushing member 17 of the pushing device 16 to the bottom of the ash charging hopper 15. Since the items are supplied in order,
Unlike the conventional case where the opening of the ash charging hopper is directly connected to the upper part of the preheating chamber in the furnace body, cold incineration ash or moist incineration ash does not enter the preheating chamber, so Since the atmosphere in the furnace body can be maintained in a stable state, for example, it is possible to prevent troubles that occur when discharging molten ash or to prevent unmelted ash from being mixed into the molten ash.

The floor material of the bottom wall 3 is a water cooling pipe 21.
Is used and the surface of the water cooling pipe 21 in the preheating side bottom wall portion 3a is directly exposed, even if the incinerated ash A is sintered on the preheating side bottom wall portion 3a, It does not stick to the surface of the bottom wall portion 3a.

By the way, in the above embodiment, only one extruding device 16 is provided in the entire width of the furnace main body 2. However, as shown in FIG. 3, for example, the extruding device 16 is arranged in the width direction of the furnace main body 2. It is also possible to arrange three units and individually control the supply of ash in accordance with the melting state in the furnace body 2.

[0027]

As described above, according to the configuration of the present invention, the ash supplied from the ash charging hopper into the furnace main body is discharged from the bottom of the ash charging hopper through the charging port by the extruder. Since it is supplied in order, unlike the conventional case where the opening of the ash input hopper is directly connected to the upper part of the preheating chamber in the furnace body, cold ash or moist ash enters the preheating chamber. Therefore, since the atmosphere in the furnace body can be maintained in a stable state, it is possible to prevent problems that occur during the discharge of molten ash or the inclusion of unmelted ash in the molten ash. You can

Further, since the cooling member is used as the floor material of the bottom wall portion on the preheating chamber side, even if ash is sintered, it does not adhere to the surface of the bottom wall portion.

[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.

FIG. 2 is a view taken along the line CC of FIG.

FIG. 3 is a plan view of a main part showing a modified usage example of the extrusion device in the ash melting furnace of the present invention.

[Explanation of symbols]

 1 Ash melting furnace 2 Furnace body 3 Bottom wall 3a Preheating side bottom wall 3b Melting side bottom wall 7 Preheating chamber 8 Melting chamber 11 Input port 12 Discharge port 15 Ash input hopper 16 Extrusion device 17 Extrusion member 18 Cylinder device 21 Water cooling pipe 31 Burner for heating

Claims (1)

[Claims] 1. An ash melting furnace for heating and melting ash by a burner, wherein an ash charging port is formed in an end wall portion on one end side of the furnace body and the ash is melted on an end wall portion on the other end side. An ash discharge port is formed, the bottom wall of the furnace body is provided so as to incline downward from one end side to the other end side, and an ash preheating chamber is formed at a position near one end in the furnace body, A melting chamber provided with a heating burner is formed at a position near the other end, at least the bottom wall portion on the preheating chamber side is configured by a cooling member, and an ash charging hopper communicating with the charging port is provided, and the charging is performed. An ash melting furnace characterized by comprising an extrusion device which is provided so as to be able to move back and forth from the mouth into the furnace body and which pushes out the ash in the ash charging hopper into the preheating chamber from the charging port.