JPH05164897A - Incinerator for nonflammable waste - Google Patents

Abstract

PURPOSE:To provide an incinerator for nonflammable waste which can shorten remaining combustible hours to a great extent, and neither allow little half- burned waste in incineration residue nor allow molten waste to be deposited on the bottom plate of the incinerator. CONSTITUTION:The upper surface of the bottom plate 3 of an incinerator is depressed in a concave shape, and molten material is prevented from flowing out with sealing air supplied to the periphery of the plate. A remaining combustion nozzle 6 is provided for the side wall of an incinerator bottom section 2, and air is blasted on remaining combustible material over the bottom plate 3, so that remaining combustible hours are thereby shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flame retardant incinerator capable of rapidly and stably burning flame retardants such as vinyl chloride and rubber.

[0002]

2. Description of the Related Art Non-flammable substances such as vinyl chloride sheets and rubber gloves are mixed in miscellaneous solid waste generated from nuclear power plants and the like. When these flame-retardants are incinerated, radioactive gas and corrosive gas are generated, and they are rapidly decomposed and burned, and the calorific value at the time of burning becomes relatively high. Conventionally, a furnace having a structure as shown in FIG. 2 has been used as a furnace for incinerating such a flame retardant. This furnace is equipped with a furnace bottom lid 21 at the bottom of a water-cooled jacket type furnace body 20, and combustion air blowing nozzles 22 and 23 are provided at the upper and lower portions of the incinerator by penetrating the side wall of the furnace body 20. There is. This mainly regulates the amount of air required for thermal decomposition in the lower part of the incinerator and combustion of the decomposed gas in the upper part of the incinerator, and helps to burn the flame-retardant material by cooling the generated heat with water. ing.

However, when the flame-retardant material is burned in such a furnace, the contact of the air is not sufficient only by supplying the combustion air from the side surface of the incinerator, and the amount of heat ablation which is the unburned residue increases. Furthermore, since the shape of the furnace bottom ash reservoir is flat, polyethylene contained in miscellaneous solids melts and flows around the furnace bottom lid 21, and sticks to the gap between the furnace body 20 and the furnace bottom lid 21 to cause flammability. However, there is a problem in that it becomes difficult to open and close the furnace bottom cover 21 as well. Further, there is a problem that the residual combustion products remaining on the furnace bottom lid 21 continue to burn in a long time and it takes more than 3 hours to complete the combustion.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art by reducing the amount of thermal ablation, which is the unburned residue in the incineration ash, and by fixing the melt to the furnace bottom lid. The present invention has been completed to provide a flame-retardant incinerator that does not have a closure and can burn the residual combustion products quickly.

[0005]

SUMMARY OF THE INVENTION The present invention, which has been made to solve the above-mentioned problems, is designed such that the upper surface of a furnace bottom lid provided at the bottom of a furnace body is recessed into a dish shape, and the furnace bottom lid and the furnace body are In addition to supplying sealing air from the lower side to the gap between and, a residual combustion nozzle that injects air toward the flame-retardant material that remains on the upper surface of the furnace bottom lid is provided on the side wall of the furnace bottom. To do.

[0006]

The present invention will be described in more detail below with reference to the embodiment shown in FIG. In FIG. 1, reference numeral 1 is a furnace body having a water cooling jacket portion, 2 is a furnace body bottom portion made of refractory material, and 3 is a furnace bottom lid provided at the center of the furnace body bottom portion 2 and opening downward. As shown in the figure, the bottom 2 of the furnace body is conically recessed,
The upper surface of the furnace bottom lid 3 is also dished. Further, in the embodiment, the heater 4 is built in the inside of the furnace bottom cover 3 to keep the furnace bottom cover 3 at 300 ° C. or higher at all times to prevent the polyethylene melt from penetrating into the incineration ash. It can be omitted.

In the present invention, the melted material such as polyethylene is prevented from flowing out by denting the upper surface of the furnace bottom cover 3 as described above. There is a risk that it will flow into the gap between the lid 3 and the furnace bottom 2.
Therefore, a sealing air line 5 is provided in the bottom 2 of the furnace body, and the sealing air is jetted upward from the gap around the furnace bottom cover 3 as shown in the figure to prevent the inflow of the melt.

Further, in the present invention, the afterburning nozzle 6 is provided by penetrating the side wall of the bottom 2 of the furnace body. The residual combustion nozzle 6 is for quickly ending the residual combustion by injecting air toward the flame-retardant material remaining on the upper surface of the furnace bottom cover 3, and its direction is It is preferable to set it as the center direction of the depression on the upper surface of the. Reference numeral 7 is a thermometer for detecting the temperature at the bottom of the furnace and grasping the conditions during combustion and afterburning. Reference numeral 8 is an ash extraction box installed below the furnace bottom cover 3.

[0009]

The flame-retardant incinerator of the present invention having the above-described structure has a conventional structure that incinerates by injecting miscellaneous solid waste containing flame-retardant material into the furnace from the upper part of the furnace body. It's just like an incinerator. Then, during incineration, polyethylene or the like melts and begins to accumulate in the furnace bottom 2. However, unlike the conventional flame retardant incinerator of the present invention, the upper surface of the furnace bottom lid 3 is recessed in a dish shape. However, the molten material does not easily flow into the surroundings because it accumulates inside the recess. Moreover, since the sealing air supplied from the lower sealing air line 5 is jetted around the bottom 3 of the furnace bottom, the melt flows down into the gap between the bottom 3 of the furnace bottom and the bottom 2 of the furnace body. Not only is it hindered, but the melt rapidly burns while being vaporized by the supply of oxygen from the sealing air.

Further, since the afterburning nozzle 6 injects air to the afterburning material which is burnt on the upper surface of the furnace bottom cover 3, combustible components in the afterburning material can be completely burned in a short time, The burning time can be shortened from the conventional 3 hours to 30 minutes.
Needless to say, the afterburning nozzle 6 can supply the air to the bottom 2 of the furnace body not only during afterburning but also during incineration to promote incineration.

When the incineration is completed in this way, the furnace bottom cover 3
Is opened downward and the incinerated ash is discharged to the ash extraction box 8. Combustion gas is released into the atmosphere after completely removing dust containing radioactive substances by ceramic filter and HEPA filter.

[0012]

As described above, the flame-retardant incinerator of the present invention has good flammability even when incinerating a flame-retardant material containing vinyl chloride, rubber, etc. generated from a nuclear power plant or the like. Therefore, the polyethylene melt does not flow into the gap around the bottom of the furnace bottom and stick to it. Moreover, the burning time after burning, which used to take more than 3 hours in the past, can be reduced to 30 minutes, enabling efficient operation of the furnace. Furthermore, the amount of ablation in the incinerated ash can be reduced, and the combustion performance can be significantly improved. Therefore, the present invention greatly contributes to industrial development as a flame-retardant incinerator that solves the conventional problems.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing a conventional example.

[Explanation of symbols]

 1 Furnace body 3 Furnace bottom lid 5 Sealing air line 6 Residual combustion nozzle

Claims (1)

[Claims] 1. A furnace bottom lid provided at the bottom of the furnace body is dished in an upper surface, and sealing air is supplied from below to a gap between the furnace bottom lid and the furnace body, and the furnace bottom lid is also provided. An incinerator for a flame-retardant material, characterized in that an after-combustion nozzle for injecting air toward a flame-retardant material that remains on the upper surface of the furnace is provided on the side wall of the bottom of the furnace body.