JP2003314969A - Melt discharge port - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a melt discharge port which stably discharges melt when dropping and discharging the melt flowing from a certain direction, and has improved durability. <P>SOLUTION: This melt discharge port is provided with a metallic water- cooled jacket having a drop hole formed thereon into which the melt flowing from a certain direction drops and a flow path leading the melt to the drop hole, and with a nozzle for spraying granulation water to the dropping melt. The height of an upper end of the metallic water-cooled jacket at a side to which the melt flows is made lower than that at the opposite side, and a hood part is provided at a top part of the metallic water-cooled jacket at the side to which the melt flows. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outlet for molten metal or molten slag (hereinafter referred to as "melt"), and more particularly to a certain direction such as a melt obtained in a melting and heat-retaining furnace of a gasification and melting facility. The present invention relates to a structure of a melt discharge port for dropping and discharging a melt flowing from a melt.

[0002]

2. Description of the Related Art Industrial wastes and general wastes contain various kinds of wastes such as papers, resins, metals and the like, and are disposed of by incineration or landfill. In recent years, toxic substances such as dioxins have been generated by the incineration of waste, and are emitted together with incinerator exhaust gas, which causes environmental pollution. Therefore, a technology for decomposing harmful substances in a high temperature atmosphere in the incineration of waste has been proposed.

For example, there is known a technique in which waste is compressed into a predetermined shape, the surface thereof is carbonized, and then gasification and melting is performed using an oxygen-containing gas. An example of the gasification and melting equipment is shown in FIG. This equipment burns wastes molded into a predetermined shape at high temperatures to decompose harmful substances such as dioxins generated from resins and to melt and recover metals in the wastes.

In treating the waste using the equipment shown in FIG. 1, first, the compression support plate 4 is lowered to insert the inlet 1.
The waste is charged into the compression device 2. Then, while the compression support plate 4 is lowered, the press 3 is moved in the direction of the compression support plate 4 to compress the waste material and form it into a predetermined shape.
When charging the waste compact 7 (hereinafter referred to as “compressed waste 7”) into the heating furnace 5, the compression support plate 4 is raised and the compression waste 7 is heated using the press 3. Push in 5.

Next, the press 3 is returned, and the compression support plate 4 is
After lowering, the waste material is charged into the compression device 2 through the charging port 1 to form the compression waste material 7. And compression support plate 4
And the compressed waste 7 is pushed into the heating furnace 5 using the press 3. By repeating this operation, the compressed waste 7 sequentially moves from the charging port of the heating furnace 5 to the discharging port.

A heating pipe 8 is arranged on the furnace wall of the heating furnace 5, and the inside of the heating furnace 5 is heated to about 600 ° C. by the high temperature gas flowing in the heating pipe 8. This high-temperature gas is obtained by burning a fuel such as LNG gas in the high-temperature gas generator 10 to raise the temperature of a gas serving as a heat medium, and between the high-temperature gas generator 10 and the heating pipe 8 of the heating furnace 5. Circulate. Thus, while the compressed waste 7 moves in the heating furnace 5, the surface of the compressed waste 7 is carbonized, and the waste having a low melting point is melted. As a result, the compressed waste 7 can be prevented from collapsing and the generation of dust can be suppressed.

The compressed waste 7 whose surface is carbonized in the heating furnace 5 is discharged from the discharge port of the heating furnace 5 and charged into the high temperature reaction furnace 6. An oxygen-containing gas supply pipe 11 is arranged below the high-temperature reaction furnace 6 to supply the oxygen-containing gas into the high-temperature reaction furnace 6. Resins in the compressed waste 7 are burned by this oxygen-containing gas, and the temperature inside the high temperature reactor 6 is maintained at 1000 ° C. or higher. The gas generated by the combustion of resins is C
Since O and H ₂ are contained, they are fed from the high temperature reactor 6 to the cooling device 12 for cooling, and then purified and recovered by the refining device 13. The purified gas thus recovered is used as fuel for various equipment.

The combustion temperature in the high temperature reactor 6 is 1000 ° C.
Because of the above high temperature, harmful substances such as dioxins generated by the combustion of resins are decomposed, and the recovered purified gas does not contain the harmful substances. On the other hand, the metals or ash contained in the compressed waste 7 is deposited in the lower part of the high temperature reaction furnace 6 and is further melted in the melting heat insulation furnace 14 having the burner 9. As shown in FIG. 4, the melt 15 (that is, the molten metal and the molten slag) passes through the flow path 17 and is discharged from the drop hole 16 into a water granulation pipe.
Drop into 19

A nozzle 18 is provided on the side wall of the water granulation pipe 19 and sprays water for water granulation onto the melt 15 falling in the water granulation pipe 19. With this water for water granulation, the melt 15 is granulated and solidified,
It falls into the aquarium 20. These particles are sufficiently cooled in the water tank 20, are carried out by the transport facility 21 (for example, a belt conveyor, etc.), and after separating the metal particles and the slag particles,
It is reused for various purposes. The arrow b in FIG. 4 indicates the moving direction of the belt conveyor. Further, FIG. 5 is a perspective view of the vicinity of the drop hole 16.

Since the melted material 15 in the melting and heat-retaining furnace 14 flows in a constant direction (that is, the direction shown by the arrow a in FIG. 4),
The heat load of the refractory material near the flow path 17 through which the entire amount of the melt material 15 passes increases, and the refractory material is melted and damaged. As a result, the shape of the flow path 17 changes, and the melt 15 adheres to the periphery of the drop hole 16. In the melt 15 in the melting and heat-retaining furnace 14, the molten metal settles downward due to the difference in specific gravity between the molten metal and the molten slag, so that the molten metal mainly adheres to the periphery of the drop hole 16 and further solidifies. Since the molten metal has a higher thermal conductivity than the molten slag, if the operation is continued in this state, the solidified metal adhered to the periphery of the drop hole 16 rapidly grows and closes the drop hole 16.

Therefore, in order to prevent melting damage of the refractory material in the vicinity of the drop hole 16, a melt discharge port using a metal water cooling jacket 22 forming the drop hole 16 and the flow path 17 as shown in FIG. 6 is also used. Is being considered. However, at this melt outlet,
Although the cooling capacity is improved, melting loss of the refractory can be suppressed, but clogging of the drop hole 16 cannot be prevented. That is, as described above, in the melt 15 in the melting heat insulation furnace 14, the molten metal is located on the lower side due to the difference in specific gravity between the molten metal and the molten slag, so that the molten metal is mainly in the metal water cooling jacket 22. Attached,
It is further cooled and solidified. Then, during operation, the metal solidified product grows and closes the drop hole 16.

[0012]

DISCLOSURE OF THE INVENTION The present invention solves the problems as described above, and melts a molten material that is flowing from a certain direction, such as a melting and heat-retaining furnace of a gasification and melting facility, when the molten material is dropped and discharged. It is an object of the present invention to provide a melt discharge port capable of stably discharging a substance and improving durability.

[0013]

SUMMARY OF THE INVENTION The present invention is directed to a metal water-cooling jacket which forms a drop hole through which a melt flowing from a certain direction falls and which is provided with a flow path for guiding the melt to the drop hole. A metal water cooling jacket that has a nozzle for injecting water for water granulation into the melt and that lowers the height of the upper end of the metal water cooling jacket on the side where the melt flows, compared to the opposite side. It is a melt discharge port where an eaves portion is provided on the upper part of the water cooling jacket.

In the above-mentioned invention, as a first preferred embodiment, the metal water cooling jacket is preferably a cast iron water cooling jacket or a copper water cooling jacket. As a second preferred mode, it is preferable that the eaves portion is provided on the entire circumference of the upper portion of the water cooling jacket made of metal.

[0015]

FIG. 2 is a sectional view schematically showing an example of the melt discharge port of the present invention. In FIG. 2, the melt 15 flows in a constant direction (that is, the direction of arrow a). In the melt discharge port of the present invention, the drop hole is formed by the water cooling jacket 22 made of metal. The metal water cooling jacket 22 is cooled by the jacket cooling water 23 flowing inside.

The height from the upper end of the metal water-cooling jacket 22 to the upper surface of the melt 15 in the melting heat insulation furnace 14 (hereinafter referred to as the upper end height) is lower on the side where the melt 15 flows, and on the opposite side. To raise. Here, the angle θ (hereinafter, referred to as an inclination angle) formed by the surface formed by the upper end of the metal water-cooling jacket 22 (hereinafter, referred to as the upper end surface) and the horizontal plane is not limited to a specific numerical value. In other words, the inclination angle θ depends on the size of the melting heat insulation furnace 14,
Depending on the flow rate of 15 and the field of view of the surveillance camera (not shown),
It may be set appropriately.

As described above, since the upper end surface of the metal water cooling jacket 22 has the inclination angle θ, when the flow rate of the melt 15 flowing in the direction of the arrow a is changed, or the flow path 17 is deformed. Even in this case, the melt 15 can be guided from the vicinity of the flow path 17 to the drop hole. Further, an eaves portion 24 is provided above the metal water cooling jacket 22 on the side where the melt 15 flows.
This eaves portion 24 needs to be provided on the side where the melt 15 flows, but as shown in FIG. 2, it may be provided all around the upper portion of the metal water cooling jacket 22, or as shown in FIG. It may be provided only on the upper side on the side where the melt 15 flows.

By providing the eaves portion 24 in this manner, the melted material 15 (mainly the molten metal) is prevented from adhering and solidifying and falling even though the metal water cooling jacket 22 having a high cooling capacity is used. It is possible to prevent blockage of holes. The metal water cooling jacket 22 is preferably made of a metal having a high thermal conductivity (eg, copper, cast iron, etc.).

In this way, the melt discharge port of the present invention can stably guide the melt 15 to the drop hole even when the flow rate of the melt 15 is changed or the flow path 17 is deformed. The water 18 for water granulation can be jetted from the nozzle 18 provided on the side wall of the water granulation pipe 19 to reliably granulate and solidify the melt 15. In addition, the clogging of the drop hole can be prevented, so that the durability of the melt discharge port is improved.

[0020]

EXAMPLES The gasification and melting equipment was operated by providing the gasification and melting equipment shown in FIG. 1 with the melt discharge port of the present invention as shown in FIG. The water cooling jacket 22 made of metal was made of copper, and the inclination angle θ of the upper end surface was 45 °. This is an invention example. On the other hand, as a comparative example, a gasification and melting facility was operated by providing a melt discharge port as shown in FIG.

[0021] In the comparative example, the drop hole was obtained after operating for 30 consecutive days.
In contrast to 16 plugged, in the invention example, the drop hole 16 was not plugged even after 300 consecutive days of operation.

[0022]

According to the present invention, when a melt flowing from a certain direction is dropped and discharged like a melting and heat-retaining furnace of a gasification and melting facility, the melt can be stably discharged,
Moreover, the durability of the melt discharge port can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view schematically showing an example of gasification and melting equipment to which the present invention is applied.

FIG. 2 is a cross-sectional view schematically showing an example of a melt discharge port of the present invention.

FIG. 3 is a cross-sectional view schematically showing another example of the melt discharge port of the present invention.

FIG. 4 is a sectional view schematically showing an example of a conventional melt discharge port.

FIG. 5 is a perspective view schematically showing an example of a conventional melt discharge port.

FIG. 6 is a sectional view schematically showing another example of a conventional melt discharge port.

[Explanation of symbols]

1 input port 2 Compressor 3 press 4 Compression support plate 5 heating furnace 6 High temperature reactor 7 Compressed waste 8 heating pipes 9 burners 10 High temperature gas generator 11 Oxygen-containing gas supply pipe 12 Cooling system 13 Refining equipment 14 Melt insulation furnace 15 melt 16 Fall hole 17 channels 18 nozzles 19 water granulation tube 20 aquarium 21 Transport equipment 22 Metal water cooling jacket 23 jacket cooling water 24 eaves

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F27D 15/02 B09B 3/00 303M F term (reference) 3K061 AA16 AB03 DA13 DB11 DB12 DB19 NB15 NB17 NB27 NB28 3K065 AA16 AB03 FA06 FA15 FA21 FB11 4D004 AA46 AC04 CA29 CB04 CB31 CC03 4K055 AA04 JA00 4K063 AA04 BA13 CA05 HA03 HA10

Claims (3)

[Claims] 1. A metal water cooling jacket that forms a drop hole through which a melt flowing from a certain direction falls and is provided with a flow path that guides the melt to the drop hole, and water falling on the melt. And a nozzle for injecting water for crushing, the height of the upper end of the metal water cooling jacket on the side where the melt flows is made lower than that on the opposite side, and the metal on the side where the melt flows A melt discharge port characterized in that an eaves portion is provided on an upper portion of a water cooling jacket. 2. The melt discharge port according to claim 1, wherein the water cooling jacket made of metal is a water cooling jacket made of cast iron or a water cooling jacket made of copper. 3. The melt discharge port according to claim 1, wherein the eaves portion is provided on the entire circumference of an upper portion of the water cooling jacket made of metal.