JP4077718B2 - Melt treatment facility in waste melting treatment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a melt treatment facility for treating a molten material discharged from a waste melting furnace by water granulation in waste melting treatment.
[0002]
[Prior art]
In the melting treatment of waste such as general waste or industrial waste, for example, the waste is charged into a waste melting furnace together with auxiliary materials such as coke and limestone, the waste is taken out as molten slag, and the molten slag is granulated. It is processed to produce granulated slag (see Patent Document 1).
[0003]
FIG. 3 is a layout of a conventional melt processing facility. The molten slag discharged from the melting furnace 1 is poured into a granulation pit 2 provided for each furnace, and rapidly cooled with granulated water and granulated. In the granulated pit 2, in order to refine high quality slag by dispersing and subdividing the slag, a surface layer flow having a flow rate of about 3 to 5 m / s is formed from the granulated nozzle 3 and the melt The water is dropped and crushed. The slag that has been granulated and settled on the bottom of the granulation pit is taken out from the granulation pit 2 by the scraper conveyor 5 provided at the bottom of the granulation pit. In the slag discharged from the granulated pit 2, large lumps that have an adverse effect such as damaging the equipment of the post-processing equipment are mixed, so the large lumps are removed by the vibrating sieve 16.
[0004]
The slag from which the metal from which the large lumps have been removed is mixed is conveyed to the magnetic separation hopper 19 by the vertical conveyor 18 to the wet magnetic separator 9 installed on the slag bunker 17, cut out by the magnetic separation feeder 20, and wet magnetic separator 9 The magnetically segregated water is added to the slag, and the slag is separated into magnetic and non-magnetized slags. The slurry-like slag is drained by the draining conveyor 21 and is put into the slag bunker 17. Since slag with a large amount of adhering water enters the slag bunker 17, it is necessary to drain enough water to prevent water leakage on the road when the slag bunker 17 is cut out with a dump. In order to cut, water is discharged from the seat part of the cutting gate part below the slag bunker over a sufficient amount of time. The discharged water is drained through a water receiver 22.
[0005]
[Patent Literature]
Japanese Patent Laid-Open No. 2000-288523
[Problems to be solved by the invention]
Conventionally, it is necessary to install a granulation pit for each melting furnace, and to install a vibrating screen that removes large lumps in the slag discharged from the granulation pit that adversely affect post-processing equipment. And construction costs were high.
[0007]
Conventionally, the granulated slag that settled in the granulation pit is drained by the conveyor in the granulation pit, and then transported by a mechanical conveyor to the wet magnetic separator installed on the top of the product bunker with the metal mixed. Then, magnetically selected water was added again, and the slurry-like slag magnetically selected was drained again. In this case, a large number of conveyors are installed for conveying the granulated slag to the magnetic separator at a high place, and there is a problem that a large space and equipment costs are generated.
[0008]
Conventionally, in order to drain the slurry-like slag water, it has been necessary to use a drainage conveyor such as a screw conveyor or a scraper conveyor, and to drain the water from the sheet portion of the slag bunker's cutting gate portion over a sufficient amount of time. It was. However, if the sealing performance of the gate is high, water cannot be discharged. Conversely, if a gap is positively provided on the seat surface, there is a problem that slag flows out together with water.
[0009]
Conventionally, a pump is installed to perform slurry transportation and magnetic separation water circulation. However, since this slurry water and magnetic separation water contain a large amount of slag fine particles, new water is required for the shaft seal portion as a slurry pump. . This new water caused an increase in the system water, and it overflowed and needed to be treated.
[0010]
Therefore, the present invention provides a melt processing facility in waste melting processing that can purify high-quality molten slag, has low equipment costs and construction costs, and requires less maintenance.
[0011]
[Means for Solving the Problems]
The melt treatment facility of the present invention is provided with one granulation pit for discharging the melt one by one from several waste melting furnaces to granulate the melt, and the water granulation pit has a tapping water. A granulation nozzle that forms a surface flow that subdivides the slag that has fallen is arranged for each waste melting furnace, and a granulation nozzle other than the granulation nozzle for the waste melting furnace in the hot water forms a surface flow. A rooster that separates large blocks of a certain size or more is provided at the bottom near the exit of the scraper conveyor, which is disposed in the granulation pit and scrapes and collects the granulated slag. It is characterized by that.
[0012]
In the above configuration, a watering nozzle for sprinkling the granulated slag is provided above the rooster, and the water that has passed through the rooster is received below the rooster, and magnetically segregated magnetic material and non-magnetized slag in a slurry state. A wet magnetic separator may be arranged, and it may be equipped with a submersible pump and piping for transporting the slurry slag selected by the wet magnetic separator onto the product bunker, and the product bunker has a draining function Furthermore, a submersible pump and a pipe for circulating magnetically separated water obtained by draining slurry wastewater after wet magnetic separation with a product bunker as water for granulated water, magnetically separated water, and large mass separation may be provided.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, a single granulated pit is used in common without providing a granulated pit for each of the plurality of melting furnaces. By processing the melts from a plurality of melting furnaces in a common granulated pit, the amount of water held in the pit is increased, the rise in the water temperature during tapping is suppressed, and this is advantageous for improving the quality of the slag. Further, conventionally, a collective conveyor for slag discharged from a plurality of granulated pits is required. However, in the present invention, since a single granulated pit is used, no collective conveyor is required.
[0014]
In order to refine high-quality slag, it is necessary to form a surface layer flow with a flow velocity of about 3 to 5 m / s from the water granulation nozzle and drop the melt there, but when the water granulation pit is shared, The water granulation nozzle for other furnaces becomes an obstacle to the formation of the surface layer flow. Therefore, in the present invention, in order to eliminate this obstacle and realize the common use of the water granulation pit, the water granulation nozzle, which becomes an obstacle to the formation of the surface layer flow, is configured to be retractable.
[0015]
Further, in the present invention, a lump of a certain size or more is separated in the lifting process by converting a part of the bottom surface of the conveyor that lifts the slag from the granulated pit into a rooster. As a result, it is possible to omit the vibration sieve that has been conventionally required.
[0016]
Also, in the present invention, the transfer equipment can be greatly simplified by directly connecting the wet magnetic separator at the outlet of the granulated pit and by transferring the slag after magnetic separation to the product bunker with the slurry pump while in the slurry state. . Moreover, the draining device after magnetic separation can be omitted by draining the slurry with the product bunker.
[0017]
Moreover, in this invention, the waste_water | drain produced | generated by draining is returned and reused as a magnetic separation water required for a granulation pit and wet magnetic separation using an underwater pump. In addition, the mass separation efficiency can be greatly increased by spraying magnetically selected water from the upper part of the rooster installed in the granulation pit. Further, by using a submersible pump as the pump, shaft seal water is not necessary, and by installing it directly in the tank, the piping can be simplified and the blockage of the piping can be prevented.
[0018]
Further, in the present invention, the bunker discharge gate portion is formed in a bag shape, the lower portion is sealed, and the upper portion is opened and water is overflowed from this portion to drain water, thereby preventing slag from flowing out. It can be easily drained.
[0019]
【Example】
FIG. 1 is a layout of a melt processing facility of the present invention, FIG. 2 (a) is a plan view of a rooster that separates a large block, and (b) is a side view.
[0020]
In FIG. 1, a single granulated pit 2 is installed and shared for a plurality of melting furnaces 1. In the granulation pits 2, for each melting furnace 1, a granulation nozzle 3 for forming a surface layer flow having a flow velocity of about 3 to 5 m / s for subdividing the dropped slag is arranged. When the water granulation pit 2 is shared, the water granulation nozzle 2 for other furnaces becomes an obstacle to the formation of the surface layer flow. Therefore, as shown in the enlarged view of FIG. The cylinder 4 is rotated to be retractable. In addition, the water drained in the system is circulated and used as the water in the granulated pit 2.
[0021]
The slag that has been granulated and settled on the bottom of the granulated pit 2 is collected and conveyed by a scraper 6 of a scraper conveyor 5 provided at the bottom of the granulated pit. In order to remove large lumps that adversely affect the equipment of the post-process equipment in the slag, as shown in FIG. 2, a rooster 7 is provided on a part of the conveyor bottom surface where the slag is lifted from the granulated pit 2, Separate large lumps over a certain size. A watering nozzle 8 is provided above the rooster 7 and sprinkles water to increase the mass separation efficiency. The water that has passed through the rooster 7 is used as magnetically selected water of the wet magnetic separator 9.
[0022]
The wet magnetic separator 9 is directly connected at the outlet of the granulated pit 2, and the slag after magnetic separation is transferred to the slurry storage tank 10 in a slurry state, and the slurry is transferred to the draining bunker 12 by the slurry pump 11 while remaining in the slurry.
[0023]
The water drained by the draining bunker 12 is stored in the bunker drainage tank 14 from the water receiving tank 13 and is circulated by the submersible pump 15 as watering of the granulated pit 2 and rooster 7 and magnetically selected water.
[0024]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the melt processing equipment which can refine | purify a high quality molten slag, is cheap in equipment cost and construction cost, and requires little maintenance is obtained.
[Brief description of the drawings]
FIG. 1 is a layout of a melt processing facility of the present invention.
FIG. 2A is a plan view of a rooster that separates a large block, and FIG. 2B is a side view.
FIG. 3 is a layout of a conventional melt processing facility.
[Explanation of symbols]
1: Melting furnace 2: Granulation pit 3: Granulation nozzle 4: Cylinder 5: Scraper conveyor 6: Scraper 7: Rooster 8: Sprinkling nozzle 9: Wet magnetic separator 10: Slurry storage tank 11: Slurry pump 12: Draining bunker 13: Water catcher 14: Bunker drainage tank 15: Submersible pump 16: Vibrating sieve 17: Slag bunker 18: Vertical conveyor 19: Magnetic separation hopper 20: Magnetic separation feeder 21: Draining conveyor Water catcher

Claims (5)

One granulation pit is installed to discharge the melt from several waste melting furnaces one by one to granulate the melt, and the surface layer that subdivides the slag that falls out and falls in the granulation pit A water-split nozzle that forms a flow is arranged for each waste melting furnace, and a water-spraying nozzle other than the water sprinkling nozzle for the waste melting furnace in the tapping bath is provided so that it can be retracted so as not to prevent the formation of a surface flow. A melt processing facility characterized in that a roastol for separating a large block of a certain size or more is provided at the bottom in the vicinity of the exit of the scraper conveyor, which is disposed in the granulation pit and scrapes and collects the granulated slag. . A water spray nozzle that sprinkles the granulated slag is provided above the rooster, and a wet magnetic separator that accepts the water that has passed through the rooster below the rooster and magnetically separates the magnetic and non-magnetic slag in a slurry state. The melt processing facility according to claim 1, wherein the melt processing facility is arranged. The melt processing facility according to claim 2, further comprising a submersible pump and a pipe for transporting the slag in a slurry state selected by a wet magnetic separator to a product bunker. The melt treatment facility according to claim 3, wherein the product bunker has a draining function. In any one of Claims 1-4 provided with the submersible pump and piping which circulate as the sprinkling water for granulated water, magnetic separation water, and a large lump separation of the magnetic separation water which drained the slurry waste water after wet magnetic separation with the product bunker. The melt treatment facility described.

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