JP2002022137A - Equipment and method for discharging slag of melting furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide equipment and method for discharging slag of a melting furnace, in which slag discharged from a melting furnace is cooled sufficiently with air and water, and discharged surely from a retainer vessel without any restriction in the discharge line, and a crystallized slag of a good quality can stably be obtained. SOLUTION: A casing 2 is equipped with an air-cooling slag-conveyor 5 provided with a plurality of molds 4 for receiving molten slag 3. Molten slag 3 discharged from the ash melting furnace 1 is provided into the molds 4, and conveyed under cooling and the discharged from the casing 2. A water retainer vessel 6 is provided in communication with the slag-discharge equipment in the slag-discharge position in the casing 2 in the rear stage of the conveyor 5. The molten slag 3 is discharged from the casing 2 into the vessel 6 at the rear stage of the conveyor 5, and is cooled with water 18 to be a solid slag 3a. A scraper-type water-cooling conveyor 7 conveys the slag 3a while scraping with a scraper 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slag discharge device for a smelting furnace that cools and discharges molten slag from an ash melting furnace for melting incinerated ash such as sewage sludge, municipal solid waste, and industrial waste. It relates to the slag discharge method.

[0002]

2. Description of the Related Art Conventionally, incinerated ash such as sewage sludge, municipal solid waste and industrial waste has been melted by an ash melting furnace and taken out as molten slag in order to reduce its resources, reduce its volume and render it harmless. ing. In such a slag discharge device of a melting furnace, for example, a mold provided on a slag conveyor of a conveying means is provided below the ash melting furnace, and the mold receives molten slag discharged from the ash melting furnace. There has been provided an apparatus of a type which is solidified and conveyed by air cooling or water cooling. As a method for cooling the high-temperature molten slag (maximum 1500 ° C), the air-cooling method has the advantage that the solidified slag becomes a large stone mass and a high-strength one can be obtained. It has the advantage that the metal components in the slag can be easily separated and recovered. On the other hand, in the case of the air-cooled system, the slag discharged into the storage tank has a high temperature, and has the disadvantage that the storage tank and the slag transport device need to have a heat-resistant structure. And the drawbacks are that the use is limited.

FIG. 5 shows a slag discharger which utilizes the advantages of the air-cooling system and the water-cooling system and eliminates the need for a countermeasure against heat in a subsequent device. The slag discharge device includes a closed casing 52 installed below a plasma ash melting furnace 51, an air-cooled slag conveyor 54 stored in the casing 52 and provided with a plurality of buckets 53, A water tank 55 is provided at a downstream end of the slag conveyor 54 in the transport direction, and a screw conveyor 56 is stored in the water tank 55. Therefore, as shown in FIG.
The incineration ash introduced into the ash melting furnace 51 is melted by the ash melting furnace 51, becomes molten slag 58, and is discharged from the slag outlet 59. The discharged molten slag 58
Is introduced into the empty bucket 53 from the inlet of the casing 52 as shown by the arrow, and gradually cooled while being conveyed by the slab conveyor 54.
2 is cooled by dropping into water in a water tank 55 below from the outlet of the second slag pit 6 and is conveyed by a screw conveyor 56 as a low-temperature solidified slag 60.
It will be discharged into 1 and stored.

[0004]

However, in the above-mentioned conventional slag discharging device, the solidified slag 60 after water cooling is carried by the screw conveyor 56 having a small driving force, so that the solidified slag 60 is bitten by the screw. When the screw conveyor 56 trips and the screw runs idle, the solidified slag 60 may not be discharged into the slag pit 61. In addition, screw conveyor 5
In the transportation by No. 6, since the discharge line becomes linear and a large installation space is required, there is a problem that the layout of the discharge line is restricted, and the degree of freedom of the device design is small.

The present invention has been made in view of such circumstances, and has as its object to sufficiently cool molten slag discharged from a melting furnace with air and water and store the molten slag without being restricted by a discharge line. It is an object of the present invention to provide a slag discharge device and a slag discharge method for a melting furnace, which can be surely discharged from a container and can stably obtain high-quality crystallized slag.

[0006]

In order to solve the problems of the prior art, according to the present invention, an air-cooled slag conveyor provided with a plurality of molds for receiving molten slag is installed in a casing, and a melting furnace is provided. After introducing the molten slag discharged from the mold into the mold, the slag discharging device for cooling while transporting and discharging from the casing is provided with a water storage container communicating with the slag discharging position of the casing. In the container, a scraper-type water-cooled conveyor is provided, which is discharged from the casing at the subsequent stage of the air-cooled slag conveyor and conveys the slag cooled by water with a scraper.

Further, in the present invention, an air-cooled slag conveyor provided with a plurality of molds for receiving molten slag is provided in a casing, and the molten slag discharged from a melting furnace is introduced into the mold and then conveyed. In the slag discharge device for cooling while discharging from the casing, a water storage container communicating with the slag discharge position of the casing is disposed in the slag discharge position of the casing, and the casing is disposed in the container at a stage subsequent to the air-cooled slag conveyor. Discharged from within,
A wet slag extruder that extrudes and transports slag cooled by water is installed.

Further, in the present invention, an air-cooled slag conveyor provided with a plurality of molds for receiving the molten slag is installed in a casing, and the molten slag discharged from the melting furnace is introduced into the mold and then conveyed. In the slag discharging device for cooling while discharging from the casing, a slag storage container communicating with the slag discharging position is disposed at a slag discharging position of the casing, and the casing is disposed in the container at a stage subsequent to the air-cooled slag conveyor. A dry slag extruder that extrudes and conveys slag discharged from the inside and cooled by air is installed.

Further, in the present invention, an air-cooled slag conveyor provided with a plurality of molds for receiving molten slag is provided in a casing, and the molten slag discharged from a melting furnace is introduced into the mold and then conveyed. In the slag discharging method for cooling while discharging from the casing, a slag storage container communicating with the slag discharging container is disposed at a slag discharging position of the casing, and the casing is disposed in the container at a downstream side of the air-cooled slag conveyor. By storing the slag discharged from the inside and cooled by air, the slag is sealed at the outlet cylindrical portion in the casing of the air-cooled slag conveyor.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments. Here, FIG. 1 is a schematic diagram showing a slag discharge device of a melting furnace according to an embodiment of the present invention. As shown in FIG. 1, a slag discharge device according to the present embodiment includes a closed casing 2 provided below a plasma ash melting furnace 1, a plurality of molds 4 for receiving molten slag 3, and these molds 4 are fixed. An air-cooled slag conveyor 5 which is provided on an endless drive chain at an interval and is configured to circulate and rotate the mold 4 at a predetermined speed;
An air-cooled slag conveyor 5 includes a water storage container 6 disposed on the slag discharge position side of the casing 2 and a scraper-type water-cooled conveyor 7 installed in the container 6.
Are stored in the casing 2 in a state of being arranged slightly upwardly toward the slag discharge position.

The above-mentioned plasma ash melting furnace 1 has a furnace body 8 formed in a cylindrical shape with a bottom, and a slag port for discharging molten slag 3 and exhaust gas 9 is provided on a lower side surface of the furnace body 8. 1
0 and a slag gutter 11 are provided. Further, a main electrode 12 and a furnace bottom electrode 13 connected to a DC power supply (not shown) are provided at the center of the upper and lower portions of the furnace main body 8, and nitrogen gas is supplied to the main electrode 12 from a nitrogen gas generator (not shown). The incinerated ash is melted by being heated by high-temperature plasma.
For this reason, on the upper side of the furnace body 8 opposite to the slag port 10, there is provided an ash inlet 14 for charging incinerated ash such as waste into the furnace body 8. Feeder 15
The ash hopper 16 is attached via the.

On the other hand, at one end of the air-cooled slag conveyor 5 on the upper wall of the casing 2, there is provided an inlet 17 surrounded by an inlet cylindrical portion 2a extending upward.
The molten slag 3 is configured to be introduced into the empty mold 4 through the inlet 17. For this reason, as shown in FIG. 1, each mold 4 has an upwardly-opening substantially U-shaped cross-section so as to receive the molten slag 3 falling at the molten slag introduction position.
As a result, the slag is transported in an upright state from the position before the molten slag introduction position to the slag discharge position, and is transported in an upside down state from the discharge of the slag to the position before the molten slag introduction position. In addition, on the lower wall of the casing 2 and on the slag discharge position side, as shown in FIG. 1, an outlet cylindrical portion 2b extending downward is provided. The outlet cylindrical portion 2b has a lower end formed to extend to the water of the water storage container 6, whereby the casing 2 and the water storage container 6 communicate with each other.
This is a structure that maintains the sealing properties of

Further, the water storage container 6 always holds the water 18 to a certain level, and stores a solidified slag 3a discharged from the casing 2 and dropped therein.
An inclined tubular portion 6b that rises obliquely upward from one end of the water tank portion 6a toward the slag discharge direction; a discharge tubular portion 6c that extends downward from the tip of the inclined tubular portion 6b; And a rising portion 6d which extends upward from the end and accommodates a part of the scraper-type water-cooled conveyor 7.

The scraper-type water-cooled conveyor 7 is wound around pulleys 19 provided at three places in the water storage container 6, and is arranged in a shape along the water tank section 6a, the inclined cylindrical section 6b, and the rising section 6d. And is always located in the water 18 in the water tank 6a. That is, the scraper-type water-cooled conveyor 7 is disposed on the downstream side of the air-cooled slag conveyor 5 in the casing 2, while discharging the solidified slag discharged from the casing 2 and cooled by the water 18 in the water tank 6 a. It has a structure to transport. For this purpose, as shown in FIG. 2, the water-cooled conveyor 7 is provided with a scraper 21 that runs on a pair of left and right rails 20. The scraper 21 has a width corresponding to the water storage container 6 and a water tank portion. 6
The solid slag 3a accumulated on the bottom surface of a is formed of a plate having a height capable of scraping the solidified slag 3a, and is configured to circulate and rotate in a direction indicated by an arrow at a predetermined speed.

In order to discharge the molten slag 3 using such a slag discharging device, first, incinerated ash is discharged from the ash inlet 14 through the ash hopper 16 and the fixed amount feeder 15 to the furnace of the plasma ash melting furnace 1. It is put into the main body 8. Then, the thrown incineration ash is heated and melted by the high-temperature plasma by the main electrode 12 and the furnace bottom electrode 13, and becomes molten slag 3. The molten slag 3 is discharged from the slag port 10 through the slag gutter 11, passes through the inlet port 17 of the casing 2, falls into the empty mold 4 moved to the molten slag introduction position, and is received. Thereafter, the mold 4 into which the molten slag 3 has been introduced is transported by the air-cooled slag conveyor 5 for a predetermined distance (one mold), and the empty mold 4 is moved to the molten slag introduction position. Is introduced into the empty mold 4.

When the above operation is repeated and the mold 4 is conveyed to the vicinity of the slag discharge position on the outlet cylindrical portion 2b side of the casing 2, the molten slag 3 is gradually cooled by air and solidified. Can be Thereafter, if the mold 4 is turned over while being transported by the air-cooled slag conveyor 5, the molten slag 3 becomes solidified slag 3a and falls from the outlet cylindrical portion 2b in the casing 2 into the water storage container 6, as indicated by the arrow, It is further cooled by the water 18 in the water tank 6a. The solidified slag 3a collected on the bottom surface of the water tank 6a is scraped off by the scraper 21 of the water-cooled conveyor 7, conveyed to the discharge cylindrical portion 6c via the inclined cylindrical portion 6b, and placed in an external slag pit (not shown). Will be discharged. (See FIG. 1).

In the slag discharging device according to the embodiment of the present invention, the outlet cylindrical portion 2b is located at the slag discharging position of the casing 2.
A water storage container 6 composed of a water tank 6a and the like is provided in communication with each other, and a scraper-type water-cooled conveyor 7 is provided in the water storage container 6 after the air-cooled slag conveyor 5; The slag 3 is discharged from the slag port 10 and the slag gutter 11 of the plasma ash melting furnace 1 and received by the mold 4 and conveyed by the air-cooled slag conveyor 5. The solidified slag 3a can be cooled and solidified gradually while increasing the strength with air, and the solidified slag 3a can be sufficiently cooled to a desired temperature with water 18 in the water tank portion 6a of the water storage container 6, and the solidified slag 3a can bite, The solidified slag 3 is scraped off by the scraper 21 of the water-cooled conveyor 7 without tripping the conveyor.
a can be reliably conveyed and discharged from the discharge cylindrical portion 6c. In addition, the obtained solidified slag 3a has high strength and excellent quality, is a highly usable material having a wide range of uses, and is cooled to a temperature that does not require special heat measures. As a result, the collection operation becomes easy.

FIG. 3 is a schematic diagram showing a slag discharge device of a melting furnace according to another embodiment of the present invention. The difference between the slag discharge device of the melting furnace according to the embodiment of the present invention and the slag discharge device of the embodiment of the present invention is as shown in FIG.
That is, a wet slag extruder 27 is installed in the water storage container 26. For this reason, in the slag discharge device of the present embodiment, the scraper-type water-cooled conveyor of the embodiment of the present invention is not provided. Water storage container 2 of the present embodiment
Reference numeral 6 denotes a water tank portion 26a which always holds the water 18 to a certain level and stores the solidified slag 3a discharged from the casing 2 and falling, and a water slag discharging direction from one end of the water tank portion 26a. An inclined tubular portion 26b rising obliquely upward, and extending upward from the other end of the water tank portion 26a,
And a rising portion 26c for accommodating a part of the wet slag pushing device 27. The wet slag extruding device 27 is a device that extrudes and conveys the solidified slag 3a discharged from the casing 2 on the downstream side of the air-cooled slag conveyor 5 and cooled with water 18 by hydraulic drive.
The arm 28 swings by the link mechanism. Other configurations are almost the same as the above-mentioned invention.

In the slag discharge device of the melting furnace according to the embodiment of the present invention, the solidified slag which has fallen from the outlet cylindrical portion 2b in the casing 2 into the water storage container 26 and is further cooled by the water 18 in the water tank portion 26a. 3a to wet slag extruder 27
Of the solidified slag 3a is held in the water tank 26a.
The arm 28 swings clockwise to gradually push the solidified slag 3a toward the slag discharge port. Then, the solidified slag 3a is conveyed while draining through the inclined tubular portion 26b, and is discharged into an external slag pit (not shown) (see FIG. 3). Therefore, the slag discharge device according to the embodiment of the present invention can achieve the same effects as those of the above-described embodiment of the present invention, and can transfer the solidified slag 3a to a post-process in a state where the slag 3a is well drained. Becomes better.

FIG. 4 is a schematic view showing a slag discharge device of a melting furnace according to still another embodiment of the present invention. The difference between the slag discharge device of the melting furnace according to the embodiment of the present invention and the slag discharge device of the above-described embodiment of the present invention is that a slag discharge device 37 is installed in a slag storage container 36 as shown in FIG. It is that you are. For this reason, in the slag discharge device of the present embodiment, the scraper-type water-cooled conveyor of the embodiment of the present invention is not provided. The slag storage container 36 of the present embodiment includes a storage portion 36a for storing the solidified slag 3a discharged from the casing 2 and falling,
An inclined tubular portion 36b that rises obliquely upward from one end of the storage portion 36a toward the slag discharge direction, and a storage portion 36.
and a rising portion 36c that extends upward from the other end of a and accommodates a part of the dry slag pushing device 37. The dry slag pushing device 37 is a device that pushes out the solidified slag 3a discharged from the casing 2 at the subsequent stage of the air-cooled slag conveyor 5 and further cooled by air by hydraulic drive to convey it. Swings. Other configurations are almost the same as the above-mentioned invention.

In the slag discharge device of the melting furnace according to the embodiment of the present invention, the slag is dropped from the outlet cylindrical portion 2b in the casing 2 into the slag storage container 36, is temporarily stored in the storage portion 36a, and is stored in the outlet cylindrical portion. The solidified slag 3a further cooled with air while sealing with 2b is dried by a dry slag extruder 37.
The solidified slag 3a is held by the arm 38 of the storage portion 36a.
The arm 38 swings clockwise to gradually push the solidified slag 3a toward the slag discharge port. Then, the solidified slag 3a is conveyed through the inclined tubular portion 36b, and is discharged into an external slag pit (not shown) (see FIG. 4). Therefore, the slag discharge device according to the embodiment of the present invention has the same effects as those of the above-described embodiment of the present invention, and does not require the wastewater treatment of the solidified slag 3a.
Equipment costs can be reduced. Further, since the solidified slag 3a can be temporarily stored in the storage portion 36a, the air-cooled slag conveyor 5 can be sealed with the outlet tubular portion 2b.

The embodiments of the present invention have been described above.
The present invention is not limited to the embodiments described above, and various modifications and changes can be made based on the technical idea of the present invention. For example, the water storage containers 6 and 26 of the above-described embodiment
And the slag storage container 36 is a scraper-type water-cooled conveyor 7.
It can be formed into various shapes according to the installation length, shape and configuration of the slag pushing devices 27 and 37. The scraper-type water-cooled conveyor 7 may be a conveyor provided with a plurality of buckets similar to the air-cooled slag conveyor 5. Further, the dry slag pushing device 37 may be horizontal as long as slag can be stored without standing up diagonally upward in the slag discharge direction. Further, in the above-described embodiment, the slag discharge device is installed below the plasma ash melting furnace 1, but the slag discharge device of the present invention is not limited to the plasma ash melting furnace, but may be a melting furnace such as a resistance melting furnace or a rotary melting furnace. May be applied.

[0023]

As described above, in the slag discharge device for a melting furnace according to the present invention, an air-cooled slag conveyor provided with a plurality of molds for receiving the molten slag is installed in a casing, and the slag is discharged from the melting furnace. After the molten slag is introduced into the mold, it is cooled and discharged from the casing while being transported, and a water storage container communicating with the slag discharge position of the casing is disposed in the slag discharge position of the casing. Since a scraper-type water-cooled conveyor is installed after the air-cooled slag conveyor, which is discharged from the casing and scraped with water by a scraper, the molten slag discharged from the melting furnace is discharged from the melting furnace. Crystallized slag that can be sufficiently cooled with air and water, can be reliably discharged from the storage container without being restricted by the discharge line, and has excellent quality It is possible to stably obtain,
The equipment can be designed freely according to the installation space of a factory or the like.

Further, in the slag discharger for a melting furnace according to the present invention, an air-cooled slag conveyor provided with a plurality of molds for receiving the molten slag is installed in a casing,
The molten slag discharged from the melting furnace is introduced into the mold, cooled while being conveyed, and discharged from the casing. A water storage container communicating with the slag discharged from the casing is disposed at the slag discharge position of the casing. In the container, a wet slag extruder that extrudes and conveys the slag discharged from the casing at the subsequent stage of the air-cooled slag conveyor and cooled by water is installed. And the drainage of the solidified slag to be drained is good, and no trouble is caused by the water pool, so that the work in the post-process can be easily performed.

Further, in the slag discharger for a melting furnace according to the present invention, an air-cooled slag conveyor provided with a plurality of molds for receiving the molten slag is provided in a casing, and the molten slag discharged from the melting furnace is discharged from the melting furnace. After being introduced into the mold, it is cooled while being conveyed and discharged from the casing, and a slag storage container communicating with the slag discharge position of the casing is disposed, and the air-cooled slag is provided in the container. Since a dry slag extruder that extrudes and conveys slag discharged from the casing and cooled by air at the rear stage of the conveyor is installed, the same effect as the above-described invention can be obtained and discharged. Wastewater treatment of the solidified slag becomes unnecessary, and equipment costs can be reduced.

In the method for discharging slag of a melting furnace according to the present invention, an air-cooled slag conveyor provided with a plurality of molds for receiving molten slag is provided in a casing.
After introducing the molten slag discharged from the melting furnace into the mold, the molten slag is conveyed, cooled and discharged from the casing, and a slag storage container communicating with the slag is disposed at a slag discharging position of the casing. In the container, the slag discharged from the casing at the subsequent stage of the air-cooled slag conveyor and stored with the air-cooled slag is sealed at the outlet tubular portion in the casing of the air-cooled slag conveyor. Therefore, the same effect as the above-described invention can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a slag discharge device of a melting furnace according to an embodiment of the present invention.

FIG. 2 is a view taken along line AA in FIG.

FIG. 3 is a schematic diagram showing a slag discharge device of a melting furnace according to another embodiment of the present invention.

FIG. 4 is a schematic view showing a slag discharge device of a melting furnace according to another further embodiment of the present invention.

FIG. 5 is a schematic view showing a conventional slag discharge device of a melting furnace.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plasma ash melting furnace 2 Casing 3 Melting slag 4 Mold 5 Air-cooled slag conveyor 6,26 Water storage container 7 Scraper type water-cooled conveyor 17 Inlet 18 Water 20 Rail 21 Scraper 27 Wet slag extruder 28 Arm 36 Slag storage container 37 Dry slag Extruder 38 Arm

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tetsuo Sato 12 Nishiki-cho, Naka-ku, Yokohama-shi, Kanagawa Prefecture Mitsubishi Heavy Industries, Ltd. Yokohama Works F-term (reference) 3K061 NB02 NB13 NB15 NB16 NB18 NB24 PA02 PA04 PA08 PA14 3K065 AA24 AB03 AC01 AC02 BA01 HA05 HA07 4K045 AA04 BA10 CA01 RB02 RC11 4K063 AA04 AA12 BA13 CA03 CA06 HA22

Claims (4)

[Claims] An air-cooled slag conveyor provided with a plurality of molds for receiving molten slag is provided in a casing, and molten slag discharged from a melting furnace is introduced into the mold, and then cooled while being conveyed. In the slag discharge device that discharges from the casing, a water storage container that communicates with the slag discharge position of the casing is disposed, and in the container, the water is discharged from the casing at a downstream side of the air-cooled slag conveyor, A slag discharge device for a melting furnace, comprising a scraper-type water-cooled conveyor for transporting slag cooled by water while scraping the slag with a scraper. 2. An air-cooled slag conveyor provided with a plurality of molds for receiving molten slag is provided in a casing, and molten slag discharged from a melting furnace is introduced into the mold, and then cooled while being conveyed. In the slag discharge device that discharges from the casing, a water storage container that communicates with the slag discharge position of the casing is disposed, and in the container, the water is discharged from the casing at a downstream side of the air-cooled slag conveyor, A slag discharger for a melting furnace, comprising a wet slag extruder for extruding and conveying slag cooled by water. 3. An air-cooled slag conveyor provided with a plurality of molds for receiving molten slag is provided in a casing, and molten slag discharged from a melting furnace is introduced into the mold, and then cooled while being conveyed. In the slag discharge device that discharges from the inside of the casing, a slag storage container that communicates with the slag discharge position of the casing is disposed, and inside the container, the slag is discharged from the inside of the casing at a downstream side of the air-cooled slag conveyor, A slag discharger for a melting furnace, comprising a dry slag extruder for extruding and conveying slag cooled by air. 4. An air-cooled slag conveyor provided with a plurality of molds for receiving molten slag is provided in a casing, and molten slag discharged from a melting furnace is introduced into the mold, and then cooled while being conveyed. In the slag discharging method for discharging from the casing, a slag storage container communicating with the slag discharging position of the casing is disposed at the slag discharging position of the casing, and the slag storage container is discharged from the casing at a subsequent stage of the air-cooled slag conveyor in the container, A method for discharging slag from a melting furnace, wherein slag cooled by air is stored and sealed at an outlet cylindrical portion in a casing of an air-cooled slag conveyor.