JPH0979560A - Water crusher for melt slag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water crusher of a melt slag which can obtain a water crushed slag clean, and stabilized with limited adhesion of heavy metals thereto. SOLUTION: An isolation member 31 with the upper end part thereof taken out above the surface of water stored in a water tank 21 is mounted along a raking surface 23 of the water tank 21 and an endless raking conveyor is mounted on the water tank 21 surrounding the isolation member 31. Clean water is supplied between the raking surface 23 of the water tank 21 and the isolation member 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water granulation device for molten slag. Municipal waste, sewage treatment sludge, industrial waste, etc.
Incineration residue is generated when various wastes are incinerated.
The incineration residue is roughly divided into incineration ash remaining in the incinerator and fly ash captured by the exhaust gas treatment system of the incinerator, mainly by the dust collector of the exhaust gas treatment system, but such incineration residue is generally In order to reduce and stabilize the volume, it is melted in a melting furnace. When the incineration residue is melted in a melting furnace, molten slag is produced, but the molten slag is normally discharged by overflow from a slag discharge port provided in the furnace wall of the melting furnace. The molten slag discharged by overflow from the slag discharge port cannot be handled as it is,
Generally, it is granulated into granulated slag. Granulated slag is either landfilled or used as civil engineering materials,
In any case, the granulated slag is required to have little adhesion of heavy metals. TECHNICAL FIELD The present invention relates to a water granulation device for molten slag capable of obtaining a water granulated slag with less adherence of heavy metals.

[0002]

2. Description of the Related Art Conventionally, as a water granulation device for molten slag, one having a water tank installed facing the slag discharge port and an endless scraping conveyor provided in the water tank has been used ( JP-A-62-172107). This water granulation device stores water in a water tank, drops molten slag discharged from the slag discharge port into the stored water to water granulate, and then scrapes the water granulated slag from the water tank by a scraping conveyor. However, in this case, in order to improve the water granulation efficiency, a nozzle is installed between the slag discharge port and the water tank, and water is also injected from this nozzle to the molten slag that is in the process of falling, and storage in the water tank is also performed. In order to form a water flow in water, some of the stored water is also extracted and circulated. However, according to such a conventional water granulation device, there is a drawback that heavy metals are easily attached to the water granulated slag scraped out from the water tank due to the heavy metals contained in the stored water contaminated by the water granulation of the molten slag. . Heavy metals adhering to the surface of the granulated slag are not stabilized and easily eluted, which may hinder the effective use of the granulated slag.

[0003]

The problem to be solved by the present invention is that, in the conventional water granulator, heavy metals are easily attached to the obtained water granulated slag.

[0004]

SUMMARY OF THE INVENTION The present invention, however, is an apparatus for water-splitting molten slag discharged from a slag discharge port of a melting furnace, which is mounted along a water tank and a scraping surface of the water tank. And an upper end portion is provided with a separating member taken out above the surface of the stored water in the water tank, and an endless scraping conveyor surrounding the separating member and equipped in the water tank. The present invention relates to a water granulation device for molten slag, characterized in that clean water is supplied between a surface and the separating member.

In the present invention, the water tank is installed under the slag discharge port of the melting furnace. This aquarium is formed into a generally inverted trapezoidal shape when viewed from the front, and therefore has an inclined surface that is continuous with the bottom surface. This inclined surface serves as a scraping surface when the granulated slag in the water tank is scraped from the water tank by the scraping conveyor described later. A separating member is mounted on the water tank along the scraping surface, and the upper end of the separating member is taken out above the water surface of the stored water in the water tank. Further, the water tank is equipped with an endless scraping conveyor which surrounds the above-mentioned separating member. This scraping conveyor usually comprises a pair of endless chains that engage with the sprockets, and a plurality of scrapers mounted on the pair of endless chains at predetermined intervals, and the scraper covers the bottom surface of the water tank and the scraping surface. It rotates in and out of the water tank while sliding. According to the present invention, clean water is supplied between the scraping surface of the water tank corresponding to the passage of the scraper and the separating member.

The separating member is for separating the portion along the scraping surface of the water tank from the other portion, and can be formed into a substantially flat plate shape. In this case, a water supply pipe is connected to the plate-shaped separating member and / or the raking surface of the water tank, and clean water is supplied between the raking surface and the separating member via the water supplying pipe. The isolation member can also be a hollow water supply header. In this case, a water supply pipe is connected to the water supply header and a nozzle hole is bored in the water supply header, and clean water is provided between the raking surface and the water supply header through the water supply pipe, the water supply header and the nozzle hole. Supply.

As the water supplied between the scraping surface of the water tank and the separating member, normal water can be used, but it is preferable to use filtered water stored in the water tank. This is because the use of normal water results in an increase in the amount of wastewater to be treated. On the other hand, even if the stored water is contaminated due to the water granulation of the molten slag, most of the heavy metals in the stored water are in the form of particles,
This is because the heavy metals can be removed by filtering the stored water, so that the filtered water can be used as clean water, and in this case, the amount of wastewater to be treated does not increase.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an overall vertical cross-sectional view from the front, illustrating a water granulating apparatus according to the present invention in relation to a melting furnace. In FIG. 1, the incineration residue is melted in an arc furnace having a furnace body 11, a furnace lid 12 attached to the furnace body 11, and three electrodes 13 inserted into the furnace from the furnace lid 12. The generated molten slag is discharged by overflow from the slag discharge port 14 formed in the furnace wall of the furnace body 11.

A water tank 21 is installed below the slag discharge port 14 of the arc furnace so as to face it. The aquarium 21 is formed in a generally inverted trapezoidal shape when viewed from the front, and therefore the bottom 22
Has a sloped surface that is continuous with the above, and this sloped surface serves as a scraping surface 23 when the granulated slag A in the water tank 21 is scraped out of the water tank 21 by the scraping conveyor 41 described later.
A substantially flat plate-shaped separating member 31 is mounted on the water tank 21 along the scraping surface 23, and the upper end of the separating member 31 is taken out above the water surface of the stored water B in the water tank 21.

The water tank 21 is equipped with an endless scraping conveyor 41 surrounding the separating member 31. The scraping conveyor 41 includes a pair of endless chains 44a and 44b that engage with the pair of sprockets 42a and 42b and another pair of sprockets 43a and 43b (however, the sprockets 42b and 43b and the endless chain 4 that engages with them).
4b (not shown, the same hereinafter), and a plurality of scrapers 45 mounted on a pair of endless chains 44a, 44b at predetermined intervals, the scrapers 45 being the bottom surface 2 of the water tank 21.
2 and the scraping surface 23 are slid while rotating inside and outside the water tank 21. Therefore, the scraping surface 23 and the separating member 3
A passage for the scraper 45 is provided between the first and second terminals.

An intake pipe 51 is connected to the water tank 21, and a filter 53, for example, a sand filter, is connected to the intake pipe 51 via a pump 52, and the filter 53 is the water supply pipe 5.
It is connected to the isolation member 31 via 4. Even if the stored water B is contaminated due to the water granulation of the molten slag, the stored water B is supplied to the filter 53 through the water pipe 51 and the pump 52, and the stored water B is filtered by the filter 53.
Heavy metals present in the form of particles therein are removed, and purified filtered water is supplied between the scraping surface 23 of the water tank 21 and the separating member 31 through the water supply pipe 54. The granulated slag A in the water tank 21 is washed with the above-described purified filtered water while being scraped along the scraping surface 23 by the scraper 45, and the heavy metals attached to the surface are removed. .

FIG. 2 is a partially enlarged vertical sectional view from the front, illustrating another water granulating apparatus according to the present invention. 2 is the same as that of FIG. 1, but the water supply header is used as the isolation member in FIG. A hollow water supply header 32 is mounted on the water tank 24 along a scraping surface 26 that is continuous with the bottom surface 25, and the upper end of the water supply header 32 is taken out above the water surface of the stored water C in the water tank 24. ing. In the case of FIG. 2 as well, the entire area between the scraping surface 26 and the water supply header 32 is a passage for a scraper 46 that constitutes a scraping conveyor (not shown).

A nozzle hole 33 is formed in the water supply header 32 so as to face the scraping surface 26, and a water supply pipe 55 is connected to the nozzle hole 33. By supplying clean water between the raking surface 26 and the water header 32 from the nozzle hole 33 via the water pipe 55 and the water header 32, the water granulated slag D in the water tank 24 is scraped by the scraper 46. Wash granulated slag D while being scraped along. Although a scraper with a scraper is used in FIGS. 1 and 2, a screw conveyor may be used as the scraping conveyor.

[0014]

As is apparent from the above, the present invention described above has an effect that it is possible to obtain a clean and stabilized granulated slag in which heavy metals are less attached to the surface.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an entire water granulating apparatus according to the present invention in relation to a melting furnace as seen from the front.

FIG. 2 is a partially enlarged vertical cross-sectional view seen from the front, illustrating another water granulation device according to the present invention.

[Explanation of symbols]

21, 24 ... water tank, 23, 26 ... scraping surface,
31 ... Isolation member, 32 ... Water supply header, 33 ...
・ Nozzle hole, 41 ... Scraping conveyor, 45, 46
... Scrapers, 53 ... Filters, 54,55 ...
・ Water supply pipe, A, D ... Granulated slag, B, C ... Stored water

Claims (3)

[Claims] 1. An apparatus for water-splitting molten slag discharged from a slag discharge port of a melting furnace, the apparatus being mounted along a water tank and a raking surface of the water tank, and having an upper end stored in the water tank. An isolating member taken out above the water surface of the water, and an endless scraping conveyor surrounding the isolating member and equipped in the water tank are provided, and a cleanup is provided between the raking surface of the water tank and the isolating member. An apparatus for water granulation of molten slag, characterized by being configured to supply water. 2. The isolation member is a hollow water supply header, and a nozzle hole is formed in the water supply header, and the water supply header and the nozzle hole are provided between the raking surface of the water tank and the water supply header. The apparatus for water granulation of molten slag according to claim 1, wherein clean water is supplied. 3. The apparatus for water granulation of molten slag according to claim 1, wherein the clean water is obtained by filtering stored water in a water tank.