JPH11351542A - Melting furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a closure of an exhaust gas extraction port, by enhancing a quality of a slag by extraction of an exhaust gas from the vicinity of a slag hole. SOLUTION: In the melting furnace 1 comprising a slag hole 5 provided at a sidewall of a furnace body 2 to extract a molten slag 3 and an exhaust gas 4 by melting an incinerated ash 8 of a waste in the body 2 to discharge the slag 3 through a slag tub 15, and the body 2 having a furnace bottom for storing molten metal and the like 13 to discharge the metal 13 from the hole 5 by inclining the body 2; an exhaust gas extraction port 18 is provided near the hole 5 in a direction perpendicular to a slag discharging direction of the slag 3 and in a horizontal direction so that the body 2 is tiltable at a center of the port 18 as an inclining center of the body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a melting furnace for melting incinerated ash such as sewage sludge, municipal solid waste and industrial waste, and incinerated ash discharged from a combustion furnace such as a commercial thermal power plant.

[0002]

2. Description of the Related Art Conventionally, incinerated ash (powder inorganic substance) such as sewage sludge, municipal solid waste and industrial waste has been used, for example, as shown in FIG. The ash is melted by a simple ash melting furnace 51 and taken out as slag. That is, in order to melt the incinerated ash in the furnace main body 52 using such an ash melting furnace 51, the incinerated ash discharged from the refuse incinerator 53 is screened by a dry ash extracting device 54, an ash conveyor 56, The incinerated ash is charged into the furnace main body 52 via the ash supply conveyor 57 and the fixed-quantity charging device 58, and is melted by the high-temperature plasma 59. The molten slag 60 is discharged from a slag port 61 through a slag gutter 62 to a dry slag apparatus 63, guided to a slag pit 65 via a slag conveyor 64, and used for various uses. For this reason, a graphite electrode 67 and an electrode 68 connected to a DC power supply device 66 are provided at the upper and lower portions of the furnace main body 52, and nitrogen gas is supplied to the graphite electrode 67 from a nitrogen gas generator 69. It has become. The refuse incinerator 53 is communicated with a chimney 71 via a bag filter 70, and the exhaust gas generated in the furnace body 52 passes through a CO combustion chamber 72, a cooling tower 73, a bag filter 74 and an exhaust gas fan 75, and the incinerator smoke is discharged. I am being led on the road. Then, air is supplied to the CO combustion chamber 72 from a combustion air fan 76 and the bag filter 7
4 is connected to the molten fly ash treatment device 77.

[0003] In the ash melting furnace 51, as shown in FIGS.
From the slag port 61 through the slag gutter 62 and the slag gutter cover 79
The molten metal 81 collected at the bottom of the furnace main body 52 is discharged from the exhaust gas discharge port 80 of
It is constituted so that it may be drained (hot water). For this reason, a rotating shaft 82 is provided on the lower surface front side of the furnace main body 52,
A hydraulic cylinder 83 for tilting the furnace main body 52 is provided on the rear side of the lower surface. Note that an ash inlet 84 is provided at the top of the furnace main body 52.

[0004]

However, in the above-mentioned conventional ash melting furnace 51, the exhaust gas 78 in the furnace body 52 is extracted from the slag port 61 in order to increase the temperature of the slag port 61. Therefore, the low melting point material in the exhaust gas 78 adheres to the wall surface of the slag gutter cover 79 and the like, and the low melting point material falls into the molten slag 60, thereby deteriorating the quality of the slag. Was. Further, the exhaust gas outlet 80 is usually installed at a position relatively far from the slag outlet 61 so as not to hinder the tilting of the furnace main body 52,
Since the temperature near the outlet of the slag gutter 62 is low, the exhaust gas 7
There is a possibility that the exhaust gas outlet 80 may be closed due to the adhesion of the low melting point material in FIG.

The present invention has been made in view of the above circumstances, and an object thereof is to improve the quality of slag by extracting exhaust gas from the vicinity of a slag outlet and to prevent the exhaust gas outlet from being blocked. It is to provide a melting furnace capable of.

[0006]

SUMMARY OF THE INVENTION In order to solve the problems of the prior art, according to the present invention, waste is melted in a furnace main body, and slag and exhaust gas are discharged from a side wall of the furnace main body. Withdrawing from the slag port, discharging the molten slag through the slag gutter, and melting the molten metal accumulated in the furnace bottom of the furnace body from the slag port by tilting the furnace body. In the furnace, an exhaust gas outlet is provided in the vicinity of the slag outlet in a direction orthogonal to the slag discharging direction of the molten slag and in a horizontal direction, and the center of the exhaust gas outlet is a tilting center of the furnace body, and the furnace body Is configured to be tiltable.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments.

FIG. 1 is a front view conceptually showing a melting furnace according to an embodiment of the present invention, FIG. 2 is a plan view conceptually showing the melting furnace, and FIG. 3 is a side view conceptually showing the melting furnace. FIG. The ash melting furnace 1 of the present embodiment has a furnace main body 2 formed in a cylindrical shape with a bottom by a refractory material (brick, caster) as shown in FIGS. On the lower side surface, a slag port 5 for extracting the molten slag 3 and the exhaust gas 4 is provided. Further, a graphite electrode 6 and an electrode 7 connected to a DC power supply (not shown) are provided in the upper and lower portions of the furnace main body 2, and nitrogen gas is supplied to the graphite electrode 6 from a nitrogen gas generator (not shown). The incinerated ash 8 is heated by the high-temperature plasma 9 and melted. For this purpose, an ash inlet 10 for introducing incinerated ash 8 such as waste into the furnace main body 2 is provided at the top of the furnace main body 2. 12 are attached.

The ash melting furnace 1 is tilted as shown by the arrow in FIG.
The molten metal 13 accumulated in the furnace bottom in the inside is discharged from the slag port 5. The slag port 5 of the furnace main body 2 is provided with a slag gutter 15 for guiding the molten slag 3 and the molten metal 13 to a movable collection mold 14, and the slag gutter 15 is disposed at a downward inclination. Have been. In addition, the slag gutter cover 1 that covers the slag gutter 15
6 is formed, and the tip end of the slag gutter cover 16 is formed in an arc shape corresponding to the upper end of the housing 17 for housing the mold 14, so that the furnace body 2 does not interfere with each other when tilted. Has become.

On the other hand, an exhaust gas outlet 18 is provided in the vicinity of the slag port 5 of the furnace main body 2 in a direction perpendicular to the slag discharging direction of the molten slag 3 and in a horizontal direction. 18 is an exhaust gas duct 1 extending in the horizontal direction
9 is connected. The center of the exhaust gas outlet 18 is the tilt center of the furnace main body 2, whereby the furnace main body 2 is configured to be tiltable. A side of the furnace main body 2 is provided with a projecting support tube 20 integrally formed therewith and having a semicircular cross section. The support tube 20 is disposed concentrically with the exhaust gas discharge port 18, and has It extends in a direction orthogonal to the gutter 15. In addition, the support cylinder 20 holds the furnace body 2 when tilted.
Has the strength to be able to receive the load. In addition, the exhaust gas outlet 18 is connected to the fixed exhaust gas duct 19a via the rotary seal portion 21 so that the tilting of the furnace main body 2 is not hindered. The support cylinder 20 is rotatably supported by a pair of right and left columns 22 provided on the slag port 5 side of the furnace body 2.

A hydraulic cylinder 23 for tilting the furnace main body 2 is provided behind the lower surface of the furnace main body 2 opposite to the slag port 5. The hydraulic cylinder 23 is disposed between the furnace main body 2 and the floor FL, and the rear part of the furnace main body 2 is moved up and down by moving its operating rod up and down. For this reason, the furnace main body 2 is installed in a state of being lifted upward from the floor surface FL, and its front side is supported by the support column 22 via the support cylinder 20, and its rear side is supported by the hydraulic cylinder 23. I have.

Using such an ash melting furnace 1, incineration ash 8
Is melted by heating the incinerated ash 8 supplied into the furnace main body 2 with the high-temperature plasma 9. Molten slag 3
Is discharged from the slag port 5 through the slag gutter 15 as shown by the arrows in FIG. 1 and FIG. On the other hand, the exhaust gas 4 generated in the furnace main body 2 is shown in FIG.
As shown by an arrow in FIG. 3, the waste gas is led from the slag port 5 of the furnace main body 2 through the exhaust gas outlet 18 through the exhaust gas duct 19 to the exhaust gas treatment facility. The molten metal 13 accumulated in the furnace bottom in the furnace body 2 raises and tilts the furnace body 2 by the action of the hydraulic cylinder 23, and the furnace body 2 is tilted forward around the exhaust gas discharge port 18. Is discharged to the mold 14 through the slag port 5 and the slag gutter 15. Then, the furnace body 2 is operated by the action of the hydraulic cylinder 23.
If the rear side is lowered, the furnace body 2 returns to the original state.

In the ash melting furnace 1 according to the present embodiment, an exhaust gas outlet 18 is provided near the slag port 5 in a direction perpendicular to the slag discharging direction of the molten slag 3 and horizontally. The slag 3 and the exhaust gas 4 can be separated at an early stage, and dust of a low melting point made of heavy metal does not fall into the molten slag 3 and is mixed, so that slag of excellent quality can be obtained. In addition, since the exhaust gas 4 can be extracted from the exhaust gas outlet 18 at a high temperature, the high temperature can be maintained until immediately before cooling, and then the cooling can be performed rapidly, so that the clogging of the exhaust gas outlet 18 due to dust adhesion can be reliably prevented. Further, since the exhaust gas duct 19 on the exhaust gas outlet 18 side is connected to the fixed exhaust gas duct 19a by the rotary seal portion 21, even if the furnace main body 2 is tilted, the exhaust gas 4
Does not leak from the exhaust gas ducts 19 and 19a.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes may be made without departing from the gist of the present invention. What you get.

[0015]

As described above, in the melting furnace according to the present invention, the waste is melted in the furnace main body, the slag and the exhaust gas are extracted from the slag port provided on the side wall of the furnace main body, and the molten slag is discharged. Discharging the molten metal accumulated at the furnace bottom of the furnace body from the slag port by tilting the furnace body, while discharging the molten metal through a slag gutter; In the vicinity of the molten slag in the direction perpendicular to the slag discharge direction, and provided an exhaust gas outlet in the horizontal direction, the furnace body can be tilted with the center of the exhaust gas outlet as the tilt center of the furnace body. Therefore, when discharging the molten metal, the furnace main body can be smoothly tilted, and the exhaust gas can be quickly extracted from the vicinity of the slag port, so that the quality of the slag can be improved.
In addition, since the melting furnace of the present invention can discharge exhaust gas for keeping the slag outlet at a high temperature, it is possible to reliably prevent the exhaust gas outlet from being blocked due to dust adhesion and to increase productivity by long-term stable operation.

[Brief description of the drawings]

FIG. 1 is a front view conceptually showing an ash melting furnace according to an embodiment of the present invention.

FIG. 2 is a plan view conceptually showing an ash melting furnace according to an embodiment of the present invention.

FIG. 3 is a side view conceptually showing an ash melting furnace according to the embodiment of the present invention.

FIG. 4 is a conceptual diagram showing equipment to which a conventional ash melting furnace is applied.

FIG. 5 is a plan view conceptually showing a conventional ash melting furnace.

FIG. 6 is a front view conceptually showing a conventional ash melting furnace.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ash melting furnace 2 Furnace main body 3 Melting slag 4 Exhaust gas 5 Slag port 6 Graphite electrode 7 Electrode 8 Incineration ash 9 High temperature plasma 10 Ash input port 13 Molten metal 14 Mold 15 Slag gutter 16 Slag gutter cover 18 Exhaust gas outlet DESCRIPTION OF SYMBOLS 19 Exhaust gas duct 20 Support cylinder 21 Rotary seal part 22 Post 23 Hydraulic cylinder

Claims (3)

[Claims] 1. A furnace for melting waste in a furnace body, extracting slag and exhaust gas from a slag port provided on a side wall of the furnace body, discharging the molten slag through a slag gutter, In a melting furnace in which molten metal accumulated in the furnace bottom of the main body is discharged from the slag port by tilting the furnace main body, in the vicinity of the slag port, the molten slag is orthogonal to the slag direction. A melting furnace, wherein an exhaust gas outlet is provided in a horizontal and horizontal direction, and the furnace body can be tilted with a center of the exhaust gas outlet being a tilting center of the furnace body. 2. A furnace according to claim 1, wherein a support cylinder disposed concentrically with said exhaust gas outlet is integrally provided with said furnace body, and said support cylinder is rotatably supported by a column.
The melting furnace according to 1. 3. The melting furnace according to claim 1, wherein the exhaust gas outlet is connected to a fixed exhaust gas duct via a rotary seal portion.