JPH11141826A - Distribution and supply apparatus of material to be molten in surface melting furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To distribute and supply materials to be molten with use of a simple structure by discharging the materials from openings provided at lower portions of a looped distribution conveyor for horizontally conveying the materials into a plurality of hoppers and controlling dampers for opening and closing the openings of the individual hoppers in accordance with the levels of the materials. SOLUTION: A distribution and supply apparatus 1 is fixed to a surface melting furnace 50 for melt treatment of materials to be molten, such as acid slag and fly ashe which are discharged from refuse incinerators. The apparatus 1 comprises a looped distribution conveyor 2 which horizontally conveys the materials. The surface melting furnace 50 comprises a furnace body 51 having hoppers 52 for storing materials A at four positions including front and rear, and right and left positions. The materials A of the furnace body 51 are transferred by supply apparatuses 53 during which the materials A are heated and melted by means of burners 54. The materials A are fed from openings 3 provided at the lower portions of the distribution conveyer 2. The openings 3 are opened or closed by dampers 4, respectively. Opening of the individual dampers 4 is controlled by the signals indicating a low level outputted from a level sensor 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an apparatus for distributing and supplying a material to be melted in a surface melting furnace used for melting a material to be melted such as incineration residues and fly ash discharged from a waste incinerator. .

[0002]

2. Description of the Related Art In recent years, in order to reduce the volume and harmlessness of incineration residues and fly ash discharged from incinerators such as municipal solid waste, a method of melting and solidifying incineration residues has attracted attention and has been put to practical use. I have. The volume of incineration residues can be reduced to 1/2 to 1/3 by installing a melting and solidifying facility, and at the same time, elution of harmful substances such as heavy metals can be prevented. This is because they can be reused as concrete aggregate and extend the life of the final landfill site.

[0003] The method of melting and solidifying the incineration residue and the like includes:
Arc melting furnace, plasma melting furnace, method of melting and solidifying by electric energy such as electric resistance furnace, surface melting furnace, swirling melting furnace, method of melting and solidifying by fuel combustion energy such as coke bed melting furnace, And all are at a practical level.

[0004] Among the above melting furnaces, the surface melting furnace is one of the most popular ones. FIG. 4 shows a typical example of the surface melting furnace, which is inside the furnace (furnace).
This has a facing (two-sided) structure in which a molten surface is formed at both left and right (left and right in FIG. 4) positions.

[0005] The surface melting furnace 50 includes a furnace body 51 and a furnace body 51.
Left and right hoppers 52 provided for storing the material A to be melted
A melt supply device 53 provided in each hopper 52 to supply the melt A to the furnace 51; a burner 54 provided in the furnace 51 to heat and melt the melt A; And a slag tap 55 for discharging the molten slag B melted. Melt supply device 53
Is composed of a plurality of pushers 56 that are provided so as to be able to move linearly through the hopper 52, and the same number of cylinders 57 that linearly move the pushers 56. As shown in FIG. 5, a molten material distribution / supply device 58 for distributing and supplying the molten material A is provided above each hopper 52. The molten material distributing / supplying device 58 includes a distributor 59 for distributing the molten material A to a required number (two) and a charging conveyor 60 for charging the distributed molten material A to each hopper 52. Made up of

[0006] The material to be melted is supplied to a distributor of the material to be melted and supplied, distributed into two parts, and charged into each hopper by each charging conveyor and stored. The molten material stored in each hopper is sequentially sent into the furnace by a pusher that is linearly moved by a cylinder of the molten material supply device, and the surface has a substantially mortar-shaped inclined surface centered on a slag tap. In this state, it is deposited on the bottom of the furnace body. In the surface melting furnace, liquid fuel or gas fuel is burned, and the inside of the furnace is 1400 to 15
The temperature is set to a high temperature of 00 ° C., and the material to be melt deposited on the furnace bottom is sequentially heated and melted from the front side by the combustion flame from the burner. Then, the surface side of the material to be melted is melted into a film to form a molten slag, which flows down a substantially mortar-shaped inclined surface, falls from a slag tap to a discharge conveyor, is cooled, and is discharged. On the other hand, the high-temperature combustion exhaust gas in the furnace is discharged from the slag tap, becomes a clean gas through a flue, an air preheater, an exhaust gas treatment device, and the like, and is then discharged into the atmosphere.

[0007]

However, since the conventional apparatus for distributing and supplying molten material is composed of the same number of hoppers and the same number of conveyers and distributors, the configuration is complicated and the control is complicated. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has been made in order to solve the problem. The object of the present invention is to simplify the structure and distribute the material to be melted which can correspond to the arrangement and size of the hopper. To provide a supply device.

[0008]

SUMMARY OF THE INVENTION The apparatus for distributing and supplying a material to be melted in a surface melting furnace according to the present invention is basically provided in the upper part of at least two hoppers and has a loop type for horizontally transporting the material to be molten. A distribution conveyor, an opening provided below the distribution conveyor for discharging the molten material to each hopper, a damper for opening and closing each opening, and a damper for opening and closing the damper by detecting the level of the molten material in each hopper. The feature lies in that it is composed of a level sensor to be controlled.

The desired damper opens according to the signal of the level sensor of the hopper, and the distribution conveyor and the supply conveyor for supplying the same operate, and the required amount of the material to be melted (until the level reaches the upper limit by the level sensor). throw into.

The number of hoppers may be two or four. In this way, the amount of the material to be melted supplied to each hopper can be equalized.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional front view showing a device for distributing and supplying a melt in a surface melting furnace of the present invention. FIG. 2 shows FIG.
Cross-sectional plan view of the. FIG. 3 is a side view of FIG.

The molten material distribution and supply device 1 has a distribution conveyor 2, an opening 3, and a damper 4, the main parts of which are applied to a surface melting furnace 50.

The surface melting furnace 50 includes a furnace body 51 and hoppers 52 provided on the front and rear and left and right sides for storing the material A to be melted.
And a melt supply unit 53 provided in the furnace and supplying the melt A to the furnace body 51; a burner 54 provided in the furnace body 51 for heating and melting the melt A; and a burner 54 provided in the furnace body 51. Slag tap 55 for discharging molten slag B melted
And a slag tap 55 at the center of the hopper 52 and the hopper 52 at the center thereof. It has a structure provided with a material supply device 53.

The furnace body 51 has a substantially box-like shape and is formed symmetrically in the front-rear and left-right directions by a furnace bottom, side walls, a ceiling wall, and the like. A tap 55 is formed. Each wall of the furnace body 51 is provided with a refractory material such as a castable refractory material or a refractory brick so as to withstand high temperatures, and a cooling device.

The hopper 52 is at least two.
In this example, it is provided on the front, rear, left and right of the furnace body 51, and can store a predetermined amount of the material to be melted A and guides the material to be melted A into the furnace body 51.

The molten material supply device 53 includes a drive shaft 61 provided below the hopper 52 so as to be rotatable about a horizontal axis.
And the melted material A of the hopper 52 provided in the axial direction thereof.
And a cylinder 57 for reciprocatingly rotating the drive shaft 61 by a predetermined angle.

Two or four burners 54 are provided on the ceiling wall of the furnace body 51, and are deposited on the furnace bottom with the surface of the slag tap 55 as a center having an approximately mortar-shaped inclined surface. The layers of the material to be melted A are sequentially heated and melted from the surface side. In this example, an oil burner or a gas burner is used, and the capacity, installation position, and quantity thereof are set so that the material A around the slag tap 55 can be heated and melted.

The distribution conveyor 2 is of a loop type which is provided above each hopper 52 and conveys the melted material A horizontally. In this example, the distribution conveyor 2 is of a flight conveyor type and has a substantially rectangular cross section and a substantially planar shape. A conveyor case 5 having a square shape,
A rail 6 laid inside the chain, an endless chain 7 guided by the rail 6 so as to be able to go around the inside of the conveyor case 5, and a material A provided at predetermined intervals between the chain and A number of flights 8 to push,
A motor (rotary driving machine) 9 provided at one corner of the conveyor case 5 to rotate the chain 7 and tensioning means 10 provided at a diagonal position thereof to tension the chain 7 (including a chain wheel and a spring, etc.). ). At one location on the upper part of the distribution conveyor 2, the material to be melted A
Is connected.

The opening 3 is provided at the lower part of the distribution conveyor 2 and discharges the melted material A to each hopper 52. In this example, the opening 3 has a substantially rectangular shape in a plane, and is formed at a position above each hopper 52. It is perforated on the bottom wall of the distribution conveyor 2 for communication.

The damper 4 opens and closes each of the openings 3. In this example, the damper 4 is disposed below the bottom wall of the distribution conveyor 2 so as to be rotatable about a horizontal axis. However, it can be rotated from a horizontal position where the opening 3 is closed to a vertical position where the opening 3 is opened by a rotary driving device such as a cylinder. Thus, each hopper 52 has a level sensor 12 for detecting the level of the material A stored therein.
Is provided. The level sensor 12 is connected to each hopper 52
Are set at two positions, low and upper. When the amount of the material to be melted A is low, the damper 4 immediately above the same is opened, and when the amount of the material to be melted A reaches the level upper limit, The damper 4 immediately above it is closed.

Next, the operation will be described based on such a configuration. The damper 3 of the requested hopper 52 is opened by the low level signal of the level sensor 12, and the distribution conveyor 2
Then, the supply conveyor 11 is operated, and the material to be melted A is weighed by an amount that satisfies the hopper level and is charged into the hopper 52.
When the level sensor 12 confirms that the level has reached the upper limit, the distribution conveyor 2 and the supply conveyor 11 are stopped so that all the melted materials A on the distribution conveyor 2 and the supply conveyor 11 are put into the corresponding hopper 52. Then, the damper 4 is closed. In this way, the material to be melted A in the four hoppers 52 is always kept at an appropriate amount.

The apparatus for distributing and supplying molten material 1 is mainly composed of
Since it is constituted by the distribution conveyor 2, it does not become bulky. For this reason, installation of the to-be-distributed / supplied apparatus 1 is facilitated, and it is not necessary to increase the height of the building accommodating the surface melting furnace 50, so that construction costs can be reduced.

The distribution conveyor 2 is of the flight conveyor type in the above example, but is not limited to this, and may be, for example, another type of chain conveyor. The surface melting furnace 50 is a four-sided type in the above example, but is not limited thereto, and may be, for example, a two-sided type shown in FIGS. 4 and 5. The arrangement of the hoppers 52 is a square in the above example, but is not limited thereto, and may be, for example, a rectangle. In the previous example, the molten material supply device 53 was configured by the drive shaft 61, the claw 62, and the cylinder 57, but is not limited thereto. For example, as illustrated in FIGS.
6 and the cylinder 57 may be used.

[0024]

As described above, according to the present invention, as described above,
The following excellent effects can be obtained. (1) A distribution conveyor provided at the upper part of at least two hoppers for continuously circulating and transporting the material to be melted horizontally, and an opening provided at the lower part thereof for discharging the material to be melted to each hopper. , And a damper for opening and closing them, the structure can be simplified, and the arrangement and size of the hoppers can be handled. Therefore, the number of connections is reduced, the number of conveyors to be operated can be reduced, the running cost is reduced, and the operation management is facilitated. (2) When a level sensor for detecting the level of the molten material in each hopper and controlling the opening and closing of the damper is provided, the supply amount of the molten material to each hopper can be equalized.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing an apparatus for distributing and supplying a material to be melted in a surface melting furnace of the present invention.

FIG. 2 is a cross-sectional plan view of FIG. 1;

FIG. 3 is a side view of FIG. 1;

FIG. 4 is a vertical sectional front view showing a conventional surface melting furnace.

FIG. 5 is a schematic front view showing an apparatus for distributing and supplying a melt to be used in a conventional surface melting furnace.

[Explanation of symbols]

1, 58: distributing and supplying device for molten material, 2: distributing conveyor,
3 ... opening, 4 ... damper, 5 ... conveyor case, 6 ... rail, 7 ... chain, 8 ... flight, 9 ... motor, 10
... tensioning means, 11 ... supply conveyor, 12 ... level sensor, 50 ... surface melting furnace, 51 ... furnace body, 52 ... hopper, 5
3 ... melt supply device, 54 ... burner, 55 ... slag tap, 56 ... pusher, 57 ... cylinder, 59 ... distributor, 60 ... feeding conveyor, 61 ... drive shaft, 62 ...
Claws, A: molten material, B: molten slag.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI F27D 3/10 F27D 3/10

Claims (2)

[Claims] 1. A loop-type distribution conveyor provided at an upper portion of at least two hoppers for horizontally transferring a material to be melted, and an opening provided at a lower portion of the distribution conveyor for discharging the material to be melted to each hopper. A melter for a surface melting furnace, comprising a damper for opening and closing each opening, a chute, and a supply conveyor. 2. A level sensor for detecting the level of a material to be melted in each hopper and controlling opening and closing of a damper.
2. A device for distributing and supplying a material to be melted in a surface melting furnace according to claim 1.