JP2535686Y2 - Water slag granulator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for granulating molten slag. BACKGROUND ART A melting furnace for melting and processing with arc heat is used to treat municipal solid waste, industrial waste, sludge, and incinerated ash. In the melting furnace, molten slag is generated by the melting treatment of the incinerated ash or the like, and the molten slag is discharged from a molten slag discharge port opened in the melting furnace. Since the discharged molten slag cannot be handled as it is, the molten slag is granulated, and the granulated product is received in a water tank disposed below. The present invention relates to an improvement of the apparatus for granulating molten slag.

[0002]

2. Description of the Related Art Conventionally, as an apparatus for granulating molten slag, a space between a molten slag discharge port opened in a melting furnace and a water tank disposed therebelow is surrounded by an iron enclosure. Is used in which a spray nozzle for water granulation is attached. This conventional apparatus granulates molten slag discharged from a molten slag discharge port by spraying water from a spray nozzle for water granulation, and receives the granulated material in a lower water tank. The spray nozzle for crushing is variably attached, and the spray angle of water is lowered from 0 to 4
There has also been proposed one that can be adjusted within a range of 5 degrees (Japanese Patent Application Laid-Open No. 62-171949).

However, the conventional apparatus as described above has a drawback that molten slag, its granulated material, dust and the like adhere or adhere to the inner surface of the enclosure, and grow over time. If such adhesion or sticking or growth is left as it is, smooth granulation of the molten slag is hindered, and smooth discharge of the molten slag is hindered.

[0004]

The problem to be solved by the present invention is that in the conventional apparatus, the molten slag, its granulated material, dust and the like adhere or adhere to the inner surface of the enclosure, and these grow over time. Is a point.

[0005]

According to the present invention, the space between the molten slag discharge port opened in the melting furnace and the water tank disposed thereunder is surrounded by an enclosure. The present invention relates to an apparatus for granulating molten slag, wherein a spray nozzle for granulating is attached, and an inner surface of the enclosure is coated with a plate made of carbon or silicon carbide.

An important point in the present invention is that the inner surface of the enclosure surrounding the space between the molten slag discharge port and the water tank is covered with a carbon or silicon carbide plate. The plate may be coated on the entire surface of the inner surface of the enclosure, or may be coated on a part of the inner surface. It is preferable that the plate material is coated from the spray nozzle for granulation to the surface of the water tank disposed below.

[0007]

According to the present invention, since the inner surface of a steel enclosure is usually covered with a plate made of carbon or silicon carbide, molten slag, its granulated material and dust are coated on the plate and therefore on the inner surface of the enclosure. Can be prevented from adhering or sticking.
In this case, it is preferable to form a water curtain along the plate material, and as the angle of water spray from the spray nozzle for water granulation becomes closer to the horizontal, the molten slag is solidified as if riding on the water flow. Since coarse slag is generated and has a strong tendency to grow, in order to prevent the generation and growth of such coarse slag, the angle of the water spray is set to a range of 45 to 80 degrees, and furthermore, the water spray is It is preferable that a spray nozzle for water granulation is installed so as to face the water surface in the water tank inside the enclosure.

[0008]

1 is a longitudinal sectional view schematically showing an embodiment of the present invention, and FIG. 2 is a partially enlarged view of FIG. A furnace lid 21 is openably and closably attached to the furnace body 11, and these are provided with a refractory material 3.
1, 32 are lined. The furnace lid 21 is provided with an inlet 22 and an exhaust outlet 23 for incinerated ash and the like.
Is installed. A molten slag discharge port 12 is opened on the side wall of the furnace main body 11, and a molten metal A is generated in a lower layer in the furnace, and a molten slag B is generated in an upper layer thereof. Ash C is floating.

A water tank 41 is provided below the molten slag discharge port 12.
Is arranged, and the space between the molten slag discharge port 12 and the water tank 41 is surrounded by an iron surrounding body 51. Enclosure 51
Is covered with a carbon plate material 61 on all four side surfaces thereof, and a granulation spray nozzle 71 is attached to a side surface of the enclosure 51 located in the direction of the molten slag discharge port 12. A common water curtain spray nozzle 72 is attached to the other three sides of the body 51.

In the illustrated embodiment, a large-diameter hole 71a and a small-diameter hole 71b are formed in the spray nozzle 71 for granulation in a slit shape, and a depression angle of about 60 degrees from the large-diameter hole 71a. And spraying water toward the water surface of the water tank 41 inside the surrounding body 51 to granulate the molten slag B, and spraying water from the small-diameter hole 71b to position the molten slag B in the direction of the molten slag discharge port 12 of the plate material 61. A water curtain is formed along the inner surface of the side surface. The water curtain spray nozzle 72 is provided with only similar small-diameter holes, and water is sprayed from these small-diameter holes to form a water curtain along the inner surfaces of the other three side surfaces of the plate member 61. Has become.

In the embodiment shown, the spray nozzle 71 for water granulation is attached only to the side of the enclosure 51 located in the direction of the molten slag discharge port 12, but it can be attached to other sides. Spray nozzle 71 for granulation
Is also used as a water curtain spray nozzle, but a dedicated water granulation spray nozzle and a dedicated water curtain spray nozzle can be separately installed.

Water is stored in the water tank 41, and an inclined plate 42 is provided in the extension direction of the surrounding body 51. The inner surface of the inclined plate 42 is also coated with a carbon plate 62, and the innermost surface of the inclined plate 42 A conveyor 43 is provided.

Using the arc generated by energizing the electrode 24, the incineration ash C or the like continuously introduced into the furnace from the inlet 22 is melted. The molten slag B generated by the melting treatment falls under its own weight from the molten slag discharge port 12 into the enclosure 51, and water spray from a large-diameter hole 71 a provided in the spray nozzle 71 for granulation on the way. To form a granulated product D. At this time, the surrounding body 51
Is covered with a carbon plate 61 over all four side surfaces. In the case of FIG. 1, a water curtain is formed on the inner surface of the plate 61, and water spray from the large-diameter hole 71a is formed. Is at a depression angle of about 60 degrees and faces the water surface of the water tank 41 inside the surrounding body 51, and the phenomenon that the molten slag B rides on the water stream does not occur. Does not adhere or stick to the inner surface of the plate material 61 at all, and there is no generation or growth of coarse slag.

The granulated product D thus granulated is placed in the surrounding body 5
1 falls under its own weight into the water tank 41 while being guided by the carbon plate 61 coated on the inner surface thereof, and is further guided to the conveyor 43 by the carbon plate 62 coated on the inner surface of the inclined plate 42. It falls under its own weight and is taken out by the conveyor 43.

[0015]

As is apparent from the above description, the present invention described above has an effect of preventing molten slag, its granulated product, dust and the like from adhering or sticking to the inner surface of the enclosure.

[Brief description of the drawings]

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

FIG. 2 is a partially enlarged view of FIG.

[Explanation of symbols]

11: furnace body, 12: molten slag discharge port, 21
... furnace lid, 22 ... input port, 23 ... exhaust port, 2
4 ... electrode, 41 ... water tank, 51 ... enclosure, 6
DESCRIPTION OF SYMBOLS 1 ... Carbon plate material, 71 ... Spray nozzle for water granulation, 72 ... Spray nozzle for water curtain, A ...
Molten metal, B: molten slag, C: incinerated ash, etc.
D: Granulated product

Claims (4)

(57) [Scope of request for utility model registration] 1. An enclosure surrounds a space between a molten slag discharge port opened in a melting furnace and a water tank disposed therebelow, and a spray nozzle for water granulation is attached to the enclosure. An apparatus for granulating molten slag, wherein the inner surface of the enclosure is covered with a plate made of carbon or silicon carbide. 2. The apparatus for granulating molten slag according to claim 1, wherein a water curtain is formed along the plate material. 3. The apparatus for granulating molten slag according to claim 1, wherein a spray nozzle for water granulation is attached so that water is sprayed at a depression angle of 45 to 80 degrees. 4. The apparatus for granulating molten slag according to claim 1, wherein a spray nozzle for water granulation is attached so that water is sprayed toward a water surface in a water tank inside the enclosure.