JP4153782B2 - Dewatering equipment for granulated slag slurry - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a dewatering apparatus for granulated slag in a facility for producing granulated slag that uses molten slag discharged from a blast furnace molten slag, a waste direct melting furnace or the like as a raw material.
[0002]
[Prior art]
For example, in equipment for producing granulated slag using blast furnace molten slag as raw material, molten slag discharged from the outlet of the blast furnace via the tap is supplied with a large amount of cooling water via the cooling water injection nozzle. The molten slag is solidified while being dispersed into fine particles by the water jet force.
[0003]
The produced granulated slag is transported to the dehydrator together with water as a granulated slag slurry. Here, water is separated from the granulated slag slurry, and only the granulated slag is appropriately carried out.
[0004]
For example, as shown in FIG. 4, the dewatering apparatus 41 has a lower side wall surface of a dewatering tank 41 formed of wire nets 41 a and 41 b, dewatered by passing water from the wire nets 41 a and 41 b, , Are discharged to the outside through the ridges 42a and 42b, respectively. At that time, in consideration of both dewatering efficiency and slag outflow, the meshes of the wire nets 41a and 41b are usually about 3 mm. However, since the slag is considerably contained in the water passing through the 3 mm wire nets 41a and 41b, it is necessary to re-separate the slag by separately providing a settling tank 43 for the dehydrated water. Moreover, since the metal nets 41a and 41b are also clogged, maintenance such as cleaning is required periodically.
[0005]
Therefore, Patent Document 1 discloses a solid-liquid separation device in which the dewatering function from the granulated slag slurry is enhanced. This solid-liquid separator distributes the granulated slag evenly with a distributor in the rotating drum, dehydrates it by cake filtration with particles settled in the rotating drum, and the granulated slag is picked up by the scraping blades in the drum. When rotating, it falls onto the carry-out conveyor and is carried out of the drum.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-180989
[Problems to be solved by the invention]
Although the solid-liquid separation device described in Patent Document 1 has an increased dehydration function, it has a complicated structure because it is composed of various components, and the maintenance cost of the facility is high as well as the initial cost of the facility cost. Moreover, the dewatered granulated slag must be temporarily stored. Therefore, a storage tank for that purpose and a conveying means up to that are required, and the facility becomes large.
[0008]
Therefore, the present invention provides a dewatering device for granulated slag slurry that can efficiently perform dewatering of the granulated slag slurry with a simple mechanism.
[0009]
[Means for Solving the Problems]
The dewatering device for granulated slag slurry of the present invention comprises a rotatable gate valve plate that opens and closes a granulated slag discharge port provided at the lower part of a bunker that receives the granulated slag slurry, A pocket for storing the water that has flowed down and discharged, and an overflow portion that is formed at the top of the pocket and overflows the water that flows out from the gap between the granulated slag discharge port and the gate valve plate and rises in the pocket It is characterized by having.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to the drawings.
[0011]
Example 1
FIG. 1A is a side view showing a first embodiment of the dehydrating apparatus of the present invention, and FIG. 1B is a longitudinal sectional view showing the inside. A gate valve plate 3 that surrounds the granulated slag discharge port 2 at the lower part of the bunker 1 that receives the granulated slag is provided opposite to the gate valve plate 3. The paired gate valve plates 3 are provided so as to be rotatable about the gate rotation shaft 4 by the gate driving device 5 via the gears 6 of the gate valve plates 3 to open and close the granulated slag discharge port 2.
[0012]
A pocket portion 8 is formed with a gap between the gate valve plate 3 and the side wall of the granulated slag discharge port 2. In the closed state, the bottom surface and the side surface are brought into close contact with the upper portion of the pocket portion 8, that is, the paired gate valve plates 3, and the upper portion of the close contact surface of each gate valve plate 3 is opened to form the overflow portion 7.
[0013]
Below the gate valve plate 3, a water receiving bowl 9 is disposed so as to be retractable. In the dehydration, when the water flowing out from the gap between the granulated slag discharge port 2 of the bunker 1 and the gate valve plate 3 is accumulated in the pocket portion 8 and exceeds the overflow portion 7 of the gate valve plate 3, it is overflowed and drained. The overflowed water is received by the water receiving bowl 9 and drained.
[0014]
The granulated slag that flows out from the gap 10 between the granulated slag discharge port 2 and the gate valve plate 3 together with the water enters the pocket portion 8, but the rising speed of the water at this portion is sufficiently slower than the portion of the gap 10, Slag is not fluidized and only water is discharged from the overflow section.
[0015]
After dehydration, the water receiving bowl 9 is retracted, and then the gate valve plate 3 is opened to discharge the granulated slag. The remaining water below the water level in the pocket portion when the valve plate is opened is discharged together with the slag, but the amount is sufficiently small with respect to the discharged amount of the slag and there is no practical problem.
[0016]
Example 2
FIG. 2A is a side view showing a second embodiment of the dehydrating apparatus of the present invention, and FIG. 2B is a longitudinal sectional view showing the inside. The same members as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.
[0017]
This embodiment is an embodiment in the case where there is one gate valve plate 3. The gate valve plate 3 is provided so as to be rotatable by a gate driving device 5 around the gate rotation shaft 4 and opens and closes the granulated slag discharge port 2.
[0018]
The gate valve plate 3 is in close contact with the valve seal plate 11 provided in the granulated slag discharge port 2, and between the gate valve plate 3, the side wall of the granulated slag discharge port 2, and the valve seal plate 11, Pocket portions 8 are formed at intervals. An overflow portion 7 is formed in the upper portion of the pocket portion 8, that is, in the upper portion of the close contact surface of the gate valve plate 3. Below the gate valve plate 3, a water receiving bowl 9 is disposed so as to be retractable.
[0019]
The gate valve plate 3 is in close contact with the valve seal plate 11, and water flowing out from the gap 10 between the pulverized granulated slag discharge port 2 and the gate valve plate 3 is stored in the pocket portion 8 and further rises to the gate valve. If the overflow part 7 of the board 3 is exceeded, it will overflow and drain. The overflowed water is received by the water receiving bowl 9 and drained.
[0020]
The granulated slag that flows out of the gap 10 between the granulated slag discharge port 2 and the gate valve plate 3 together with the water enters the pocket portion 8, but the rising speed of the water in the pocket portion 8 is sufficiently slower than the gap portion. The slag is not fluidized and only water is discharged from the overflow section 7.
[0021]
After draining the water, the water catcher 9 is retracted, and then the gate valve plate 3 is opened to discharge the granulated slag.
[0022]
Example 3
FIG. 3 is a cross-sectional view showing a third embodiment of the dehydrating apparatus of the present invention. The same members as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.
[0023]
In the first and second embodiments, when the amount of water flowing into the bunker 1 is large, for example, when granulated slag is sent by slurry transportation, the water level in the bunker 1 rises and the flow rate of the pocket portion 8 increases. It is considered that the slag accumulated in this portion is fluidized and flows out from the overflow portion 7.
[0024]
Therefore, in this embodiment, the pocket portion 8 is formed by arranging the bunker discharge port 2 at a sufficient interval so as to surround the lower portion of the bunker 3. The upper part of the bunker discharge port 2 is opened to form the overflow part 7 so that the water level in the bunker does not rise above this level. A water catch 9 is provided on the outer periphery of the overflow portion to receive the overflowed water.
[0025]
In the lower part of the bunker discharge port 2, a pair of gate valve plates 3 is provided as in the first embodiment. However, the pair of gate valve plates 3 is not provided with an overflow portion.
[0026]
In the present embodiment, when the amount of water flowing into the bunker is large, it is possible to prevent the water level in the bunker from rising and the granulated slag from being fluidized by the discharged water flow and flowing out from the overflow portion of the valve plate.
[0027]
【The invention's effect】
In the present invention, the granulated slag slurry can be efficiently dehydrated by a simple mechanism for allowing water to overflow from the lower part of the bunker.
[Brief description of the drawings]
FIG. 1A is a side view showing a first embodiment of the dehydrating apparatus of the present invention, and FIG. 1B is a longitudinal sectional view showing the inside.
FIG. 2A is a side view showing a second embodiment of the dehydrating apparatus of the present invention, and FIG. 2B is a longitudinal sectional view showing the inside.
FIG. 3 is a cross-sectional view showing a third embodiment of the dehydrating apparatus of the present invention.
FIG. 4 is a longitudinal sectional view of a conventional dehydrator.
[Explanation of symbols]
1: Bunker 2: Granulated slag discharge port 3: Gate valve plate 4: Gate rotary shaft 5: Gate drive device 6: Gear 7: Overflow portion 8: Pocket portion 9: Water receiving rod 10: Clearance 11: Valve seal plate 41 : Dewatering tank 41a, 41b: Wire mesh 42a, 42b: Trap 43: Sedimentation tank

Claims (4)

A pivotable gate valve plate that opens and closes a granulated slag discharge port provided at a lower part of a bunker that receives the granulated slag slurry, and a pocket for storing water that has flowed down the granulated slag discharge port; A granulated slag slurry comprising an overflow portion formed in an upper portion of a pocket and overflowing water that flows out from a gap between the granulated slag discharge port and the gate valve plate and rises up the pocket. Dehydration device.   A rotatable gate valve plate surrounding the granulated slag discharge port at the lower part of the bunker for receiving the granulated slag slurry is provided oppositely, and the paired gate valve plates are closed. Then, the bottom surface and the side surface are in close contact, the upper portion of the contact surface is opened to form an overflow portion, and a pocket portion is formed with a gap between the gate valve plate and the granulated slag discharge port. The dewatering device for granulated slag slurry according to claim 1.   A pivotable gate valve plate surrounding the granulated slag outlet at the bottom of the bunker that receives the granulated slag slurry is provided to open and close the granulated slag outlet, and the bottom and sides are in close contact with the gate valve plate closed. A valve seal plate is provided, the upper portion of the contact surface of the gate valve plate is opened to form a water overflow portion, and a gap is provided between the gate valve plate, the granulated slag discharge port, and the valve seal plate. The dewatering device for granulated slag slurry according to claim 1, wherein a pocket portion is formed by opening. A bunker outlet having a pocket portion for storing the water that has flowed down the bunker at a distance so as to surround the lower portion of the bunker that receives the granulated slag slurry is provided in the lower portion of the bunker, and the upper portion of the pocket portion is opened. An overflow part that overflows the water that rises in the pocket, the overflow part is a level that does not raise the water level in the bunker above this level , and is pivotable to open and close the granulated slag discharge port below the bunker discharge port dehydrator water granulated slag slurry characterized in that the gate valve plate is provided.

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