JP3195145B2 - Incineration ash melting and solidifying equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an incineration ash melting and solidifying apparatus for melting and solidifying incineration residues of industrial waste and dust ash to render them harmless.

[0002]

2. Description of the Related Art Generally, most incinerated ash such as industrial waste is landfilled. However, since it is difficult to secure landfills in recent years, useful use and volume reduction have been demanded, and a method of solidifying incinerated ash as it is with cement has been used. There is a defect that the volume of the waste is increased by the use of the binder in addition to the cement.

[0003] In recent years, it has been proposed to detoxify industrial waste by melting and solidifying it. However, in a combustion-type melting and solidifying apparatus, incinerated ash having a small particle size is scattered by the flow rate of the combustion gas, and the efficiency is reduced. Disadvantages such as inability to process are pointed out.

The present invention solves the above-mentioned drawbacks and continuously and forcibly pushes powdered ash having a small particle size into molten slag without granulating it, thereby efficiently detoxifying industrial waste. To provide an incineration ash melting and solidifying apparatus.

[0005]

The gist of the present invention will be described with reference to the accompanying drawings.

In the incineration ash melting and solidifying apparatus for melting and solidifying incineration ash, a powder ash introduction path 4 for introducing powder ash 3 into the melting furnace 2 and a coarse ash 5 on one side of a melting furnace 2 having an appropriate heating means 1. Is provided to the melting furnace 2, and the open ends of the powdered ash introduction path 4 and the coarse ash introduction path 6 face the storage 2 ′ of the melting furnace 2. The opening end of the powder ash introduction passage 4 is positioned below the opening end of the furnace, and the storage end 2 ′ of the melting furnace 2 is passed from the opening end through the powder ash introduction passage 4.
The powdered ash 3 introduced into the melting furnace is formed by the coarse ash 5 introduced into the storage part 2 ′ of the melting furnace from the open end of the coarse ash introduction passage 6.
The powdered ash 3 is configured so as to be blocked by the sedimentary layer A and not scattered, and appropriate means 7 for forcibly introducing the powdered ash 3 introduced into the melting furnace 2 from the powdered ash introduction path 4 is provided. And a melt solidification unit 21 for solidifying the melt discharged from the melting furnace 2 is provided in the incineration ash melting and solidifying apparatus.

[0007]

The powdered ash 3 is introduced from the coarse ash introduction passage 6 into the storage 2 'of the melting furnace 2 and is forcibly forced by appropriate means 7 below the deposition layer A of the deposited coarse ash 5. be introduced. Since the powder ash 3 is interrupted by the deposition layer A, appropriate heating means 1
It does not fly due to the flow velocity of the water.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS The drawings illustrate one embodiment of the present invention.
This will be described below.

Here, the powder ash 3 which is scattered by the thermal power of the gas burner is called powder ash 3 and the powder ash which is not scattered is called coarse ash 5.
Specifically, powder ash 3 having a particle size of about 1 mm or less is referred to as coarse ash 5 and powder ash having a particle size of about 1 mm or more is referred to as coarse ash 5.

A melting furnace 2 for melting powder ash 3 and coarse ash 5
Is provided. A storage section 2 'is provided below the melting furnace 2, and the coarse ash introduction path 6 is provided in the storage section 2' in two vertical stages on the upper side.
A powder ash introduction path 4 is provided continuously on the lower side. Above the coarse ash introduction path 6 and the powder ash introduction path 4, a powder ash storage section 8 and a coarse ash storage section 9 are respectively provided continuously, and the powder ash storage section 8 and the coarse ash storage section 9 are appropriately transported. The powder ash 3 or the coarse ash 5 is transported by means 11 (for example, a bucket type conveyor).

Reference numeral 10 denotes an opening / closing section which opens and closes appropriately when the powdered ash 3 and the coarse ash 5 are conveyed by an appropriate conveying means 11;
Is a level meter.

Reference numerals 13 and 13 'denote rotary valves, and the level gauge 12, the rotary valves 13 and 13', and the conveying means 11 are linked by an appropriate means, and an appropriate amount is supplied to the storage 2 'of the melting furnace 2. Powder ash 3 and coarse ash 5 are introduced.

Reference numeral 20 denotes a two-stage damper, which operates the rotary valve 13 and the two-stage damper 20 to operate the rotary ash valve 13 and the two-stage damper 20 to keep the powder ash 3 in a powder ash introduction path. 4 and is introduced into the melting furnace 2.

In the drawings, a gas burner is used as an appropriate heating means 1. Reference numeral 15 denotes an overflow port for the molten material (molten slag).

Further, the drawing shows a slag machine 16 which receives a molten slag overflowing from an overflow port 15 as a melt solidification section 21 in a recess 16 ′ and hardens it during transportation to form a hardened slag mass. I have adopted it. Not only the casting machine 16, but also a known technique such as water granulation, in which molten slag is poured into water and cooled and solidified, may be used.

Further, the drawing employs a pressure device for appropriately feeding air to the powder ash introduction passage 4 as appropriate means 7, and the air is supplied to the powder ash introduction passage 4 to maintain the pressure to overcome the buoyancy of the powder ash 3. And the pressure is automatically controlled by a damper 14 and a pressure control (PC) 17 so that the powder ash 3 is forcibly and continuously pushed into the molten slag.
Since the pushed powder ash 3 has the sedimentary layer A of the coarse ash 5 immediately above, the floating is prevented, the melted slag flows into the molten slag, and is discharged from the overflow port 15 together with the molten slag of the coarse ash 5. In addition, the part shown by the code | symbol B is a part into which the powder ash 3 is pushed.

Reference numeral 18 denotes a tap for occasionally tapping heavy metal or the like remaining at the bottom of the storage section 2 ', and 19 denotes an exhaust duct.

This embodiment has the following functions and effects because of the above configuration.

An appropriate amount of coarse ash 5 is introduced into the melting furnace 2 in advance, and is melted by a gas burner to store a non-combustible portion of the molten material (molten slag) in the storage portion 2 ′. Keep the slag in an overflowable state.

Subsequently, the coarse ash 5 is introduced into the upper surface of the molten slag on the discharge side of the combustion gas of the gas burner of the melting furnace 2 through the coarse ash introduction path 6. 6
The deposited layer A is formed on the molten slag near the opening end by the natural angle of repose. The surface of the deposition layer A is heated by the combustion gas of the gas burner, gradually melts, flows down by gravity, and flows into the molten slag in the storage section 2 ′. Further, the portion of the deposited layer A that is in contact with the molten slag gradually dissolves into the molten slag due to heat transfer from the molten slag.

Further, the powdered ash 3 is supplied so as to be forcedly and continuously pushed into the molten slag under the deposition layer A of the coarse ash 5 at a pressure that overcomes the buoyancy of the powdered ash 3. Since the powdered ash 3 is introduced below the deposition layer A, the scattering of the powdered ash 3 due to the flow velocity of the combustion gas of the gas burner is reliably prevented.

When the level of the deposited layer A of the coarse ash 5 is lowered, the rotary valve 13 'is further operated to introduce the coarse ash 5, and a new deposited layer A is formed. The formation of the deposited layer A can be automatically controlled in accordance with the melting rate of the deposited layer A.

As described above, according to the present embodiment, the powdered ash 3 is formed into a molten slag without being scattered, and the metals having a higher specific gravity accumulate in the storage discharge passage 18 at the bottom of the storage part 2 'and are periodically taken out. Effective utilization can also be achieved.

As described above, since the powder ash 3 does not come into contact with the combustion gas of the gas burner, it does not scatter and is safely melted into slag, cooled and solidified, and rendered harmless.
On the other hand, heavy metals having a high specific gravity accumulate at the bottom of the storage portion 2 'due to a difference in specific gravity, so that the heavy metals can be periodically extracted from the storage / discharge path 18, recovered as resources, and usefully used. Also,
Since the combustion gas does not touch the powdered ash 3, the dust concentration in the exhaust gas becomes low, and the exhaust gas is sufficiently purified by a known exhaust gas treatment device (not shown).

[0025]

As described above, according to the present invention, there is no scattering of powder ash and the molten slag can be continuously formed, so that the powder ash can be efficiently detoxified.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view of the present embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Appropriate heating means 2 Melting furnace 2 'Storage part 3 Powder ash 4 Powder ash introduction path 5 Coarse ash 6 Coarse ash introduction path 7 Appropriate means 21 Melt solidification part A Sedimentary layer

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B09B 3/00 F23G 5/00 115 F23J 1/00

Claims (1)

(57) [Claims] 1. An incineration ash melting and solidifying apparatus for melting and solidifying incineration ash, a powder ash introduction passage for introducing powder ash into the melting furnace having one side of a melting furnace having appropriate heating means, A coarse ash introduction path is provided for introduction into the powder ash introduction path,
The open end of the coarse ash introduction path faces the storage part of the melting furnace, and the open end of the powder ash introduction path is positioned below the open end of the coarse ash introduction path. Powder ash introduced from the furnace into the storage part of the melting furnace is formed by the coarse ash introduced into the storage part of the melting furnace from the open end of the coarse ash introduction path
The powdered ash is constituted so as not to be scattered by being interrupted by the deposited layer to be provided, and an appropriate means for forcibly introducing the powdered ash introduced into the melting furnace from the powdered ash introduction path is provided in the powdered ash introduction path,
An incineration ash melting and solidifying apparatus, which is provided with a melt solidification section for solidifying a melt discharged from a melting furnace.