JP5442340B2 - Method for removing granulated solids from granulated pits and granulated pits - Google Patents

Description

  The present invention relates to a water granulation pit and a method for taking out a water granulated solid from the water granulation pit, and in particular, to a waste treatment facility for treating the water melted from a waste melting furnace in the waste treatment by water granulation. The present invention relates to a granulation pit provided and a method for taking out a granulated solidified product from the granulation pit.

  In the waste gasification and melting facility, the ash content of the waste is taken out as molten slag and molten metal, cooled and solidified in the water granulation pit in the water tank, and the precipitated granulated solidified product is taken out from the granulation pit. ing. The granulated solidified product is mostly sandy slag having a particle diameter of 1 mm or less and granular metal particles of 5 to 10 mm, but there are a small amount of lump-like foreign matters.

FIG. 5 shows the structure of a conventional granulated pit. 6 is a cross-sectional view taken along line BB in FIG.
As shown in FIG. 5, the melt 14 discharged from one or a plurality of gasification melting furnaces (not shown) passes through the melt trough 3 arranged at the bottom of the gasification melting furnace, It is dropped and supplied into the water stored in the granulated pit casing 1. At this time, the melt 14 is finely dispersed by the jet water from the water jet nozzle 2 disposed in the vicinity of the landing of the melt 14, and is cooled and solidified in the process of settling in the water. The granulated solidified product 15 mainly composed of slag or metal is deposited at the bottom of the granulated pit casing 1.

  The granulated solidified product 15 that has settled at the bottom of the granulated pit casing 1 is conveyed by the scraper conveyer 4, scraped up onto the water surface, and taken out from the outlet 1 a at the end of the casing. In the scraper conveyor 4, a large number of scrapers 10 are connected by a chain 11 to form one loop (that is, an endless conveyor). In FIG. 5, it is the transport direction that moves toward the discharge port 1 a along the bottom surface of the granulated pit casing 1. Therefore, the scraper 10 is driven in the direction of the arrow in the figure by the drive chain wheel 5 and the drive device (for example, drive motor M) arranged on the water surface. The return side of the chain 11 is bridged and supported at regular intervals by the return side chain support foil 9 and is reversed to the conveying side by the tension adjusting chain wheel 6. The tension of the chain 11 is adjusted by the tension adjusting chain wheel 6 to adjust the elongation of the chain 11 during initial adjustment and use.

  Thus, the conventional scraper conveyor 4 performs the horizontal conveyance of the granulated solidified material 15 and the conveyance in the inclined direction for draining water. That is, in FIG. 5, since the scraper on the conveying side of the scraper conveyor 4 moves on the inclined surface from the portion C in the drawing and comes out on the water surface, it is necessary to change the direction at the portion C. Therefore, the conveyance-side scraper presser guide 7 is necessary, and the guide is formed in a curved shape at the C portion. In this case, since the pulling force and the initial tension from the drive chain wheel 5 are applied to the chain 11, the scraper 10 is lifted from the bottom surface of the casing by being pulled by the chain 11, and the conveyance scraper presser guide at C part. 7 and the scraper 10 always slide in contact with each other.

  Also on the return side, a return-side scraper guide 8 is provided to prevent the scraper 10 from floating due to the tension of the chain 11. Also in this case, the scraper 10 and the guide 8 are always in sliding contact with each other due to the tension of the chain 11 as in the C portion on the conveyance side.

  Thus, the conventional granulated pit 1 requires a large amount of power to drive the drive chain wheel 5 because of the resistance caused by the sliding friction between the scraper 10 and the guides 7 and 8, and the scraper 10 is further matched to the power. There is a drawback that the chain 11 to be connected also becomes large.

  Furthermore, the conveyance-side scraper presser guide 7 is not composed of only the curved portion of the C portion, but is prevented from being caught by the entire length of the conveyance path in order to prevent the crushed granulated solidified product 15 from biting into the operating portion. It is installed across. As shown in FIG. 7, the scraper 10 is normally moved with a clearance δ1 from the conveyance-side scraper pressing guide 7. However, when a foreign object 16 such as a metal lump is present on the bottom surface of the casing 1 and the scraper 10 rides on the foreign object 16, the scraper 10 is sandwiched between the conveyance side scraper pressing guide 7 and the scraper conveyor 4 is There may be a situation where the vehicle stops (part D in the figure). This biting phenomenon often occurs at a portion C where the scraper 10 is lifted from the bottom of the casing due to the tension of the chain 11. And the stop by the biting of this foreign material 16 occupies most of the cause of the stop of the granulation pit.

JP 2004-181361 A JP 2009-8313 A JP 2001-201035 A

  That is, the present invention has been made in order to solve the above-mentioned problem mentioned as an example, and the purpose thereof is a granulated pit and water that can reduce power loss due to contact sliding between the scraper and the guide. An object of the present invention is to provide a method for taking out a water granulated solid from a crushing pit.

  Another object of the present invention is to suppress the phenomenon of foreign object biting that is likely to occur when the scraper floats from the bottom of the casing due to chain tension, and to reduce the stoppage of the scraper conveyor due to foreign object biting. It is an object of the present invention to provide a granulated pit and a method for removing a granulated solidified product from the granulated pit.

The granulated pit according to the present invention is the above-mentioned scraper conveyor, in which a high-temperature melt is solidified in water, and the settled granulated solidified product is conveyed to the surface of a water by a scraper conveyor having a bottom surface as a conveying surface. , A first-stage scraper conveyor arranged in a straight line in the horizontal direction for conveying the crushed and solidified product in water, and a second stage arranged in a straight line in the inclined direction for conveying the crushed and solidified product to the surface of water. Each of the first-stage and second-stage scraper conveyors is characterized by having no scraper pressing guide and being driven independently.

In addition, according to the present invention, the method of removing the granulated solidified product from the granulated pit is such that a high-temperature melt is solidified in the water of the granulated pit, and the granulated solidified product precipitated in the granulated pit is transported to the bottom surface. a method of taking out and conveyed by scraper conveyor and the surface to above the water surface, are arranged linearly in a horizontal direction on the water-granulated pit, carried by no scraper presser guide first stage scraper conveyor water砕固product in water However, it is separated from the first-stage scraper conveyor and is linearly arranged in an inclined direction that is driven independently, and the granulated and solidified product is conveyed to the surface of the water by a second-stage scraper conveyor without a scraper press guide. It is characterized by

End of the previous SL 2 stage scraper conveyor return side, it is preferable that the arrangement which has entered to a position under the first stage scraper conveyor. Furthermore, it is preferable that the second-stage scraper conveyor is set to have a shorter scraper pitch, a higher conveyor rotation speed, or both than the first-stage scraper conveyor. Furthermore, a conveyance guide member for the pulverized and solidified material, which is disposed along the conveyance direction of the first-stage scraper conveyor and whose tip extends to a position above the connecting portion of the second-stage scraper conveyor, may be further disposed. preferable.

  According to the present invention, a scraper conveyor that takes out a granulated solidified product from a granulated pit, a first-stage scraper conveyor arranged in a horizontal direction for conveying the granulated solidified product in water, and the granulated solidified product on a water surface. And the second-stage scraper conveyor arranged in the inclined direction for conveying the first-stage and second-stage scraper conveyors, respectively, so that the first-stage and second-stage scraper conveyors are driven independently. A side scraper guide is not required, thereby reducing the frictional resistance. As a result, the power loss of the scraper conveyor can be reduced, and the processing cost can be reduced.

  Furthermore, since the conveyance-side scraper pressing guide and the return-side scraper guide are not required, the above-described foreign matter biting phenomenon is eliminated, so that the problem that the apparatus stops abnormally can be remarkably improved. As a result, it can be expected that the reliability of the present apparatus is greatly improved.

It is a longitudinal cross-sectional view of the granulated pit according to one Embodiment of this invention. Section AA of FIG. 1 is shown. It is a drive motor of the 1st conveyor of FIG. It is a figure which shows a mode that the 1st conveyor of FIG. 1 conveys a granulated solidified material. It is a longitudinal cross-sectional view of the conventional granulated pit. FIG. 6 shows a cross section BB of FIG. It is a figure which shows the scraper conveyor conveyance state of FIG.

  Hereinafter, a granulated pit according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. However, the technical scope of the present invention is not construed as being limited by the embodiments described below.

  FIG. 1 is a longitudinal sectional view of a double scraper chain type granulated pit according to a preferred embodiment of the present invention. The granulated pit 1 includes a granulated pit casing 1 in which water for cooling a melt 14 discharged from a melting furnace (not shown) such as a gasification melting furnace is stored. The casing 1 has a substantially rectangular shape on the rear side in the transport direction, and has an inclined surface on the front side in the transport direction, and an outlet 1a for taking out the water-granulated solidified product is formed at the end thereof. Further, an opening 1 b for receiving the molten material 14 discharged from the molten metal bowl 3 disposed at the bottom of the melting furnace into the casing 1 is formed on the upper surface side of the casing 1. And the water injection nozzle 2 is arrange | positioned in the water landing vicinity of the melt 14, and the melt 14 is disperse | distributed finely with jet water. The dispersed melt 14 cools and solidifies to become a granulated solidified product 15 and settles to the bottom of the casing. In addition, although the structure which receives the melt 14 from two melting furnaces is illustrated in FIG. 1, it may be more than that and the number of melting furnaces is not limited.

  On the bottom side of the granulated pit casing 1, a scraper separated into a first-stage scraper conveyor 4 a for conveying the granulated solid product in water and a second-stage scraper conveyor 4 b for draining the granulated solid product from the water. A conveyor 4 is arranged.

  The first stage scraper conveyor 4 a is arranged in a substantially horizontal direction along the bottom surface of the casing 1. The first-stage scraper conveyor 4a includes, for example, a drive chain wheel 5a that is rotationally driven by a drive mechanism such as a drive motor M, a chain wheel 6a for tension adjustment, and an endless chain that is rotated by the chain wheels 5a and 6a. 11a and a number of scrapers 10a connected to the chain 11a at a predetermined pitch. The crushed solidified material is conveyed along the bottom surface of the casing 1, and the conveying scraper moves upward toward the tension adjusting chain wheel 6 a. The return side scraper is bridged and supported by a plurality of return side chain support foils 9a arranged in a straight line along the bottom surface of the casing.

  The second-stage scraper conveyor 4 b is arranged in the inclined direction along the inclined surface of the casing 1. Similarly to the first-stage scraper conveyor 4a, the second-stage scraper conveyor 4b is, for example, a drive chain wheel 5b that is rotationally driven by a drive mechanism such as a drive motor M, a tension adjusting chain wheel 6b, and these chain wheels 5b, An endless chain 11b rotated by 6b and a number of scrapers 10b connected to the chain 11b at a predetermined pitch are provided. The return-side scraper is bridged and supported by a plurality of return-side chain support wheels 9b arranged in a straight line along the inclined surface of the casing 1.

  The second-stage scraper conveyor 4b is arranged so that the end on the return side (at least the tension adjusting chain wheel 6b) enters the lower position of the first-stage scraper conveyor 4a. That is, the ground and solidified product conveyed in water by the first-stage scraper conveyor 4a is disposed so as to drop (sink) in the water and be delivered to the second-stage scraper conveyor 4b. At that time, the granulated solidified product is prevented from sinking to the corner of the casing 1 where the second-stage tension adjusting chain wheel 6b is located, and the second-stage scraper conveyor 4b is subjected to the granulation at the connecting portion 41. The conveyance guide member 1b is arranged so that the solidified material is delivered.

  Furthermore, in order to prevent the pulverized and solidified material from staying at the connecting portion 41, the second-stage scraper conveyor 4b needs to have at least the same conveying capacity as that of the first-stage scraper conveyor 4a. For this reason, it is preferable that the second-stage scraper conveyor 4b sets the pitch of the scraper 10 shorter than the first-stage scraper conveyor 4a, sets the rotation speed of the conveyor faster, or both.

  Thus, the scraper conveyor 4 in this embodiment is divided into the first-stage scraper conveyor 4a and the second-stage scraper conveyor 4b, and each is driven independently. Two drive chain wheels, a first-stage drive chain wheel 5a and a second-stage drive chain wheel 5b, are arranged and rotated by an external drive device. Therefore, in this case, as shown in FIG. 3, since the drive shaft 12 of the first-stage drive motor M penetrates the side wall of the casing 1 in water, a rotary shaft seal device 13 such as a mechanical seal or a land seal is provided. I am doing so.

  As described above, the granulated pit 1 of the present embodiment includes the scraper conveyor 4 for taking out the granulated solidified product, the first-stage scraper conveyor 4a for conveying the granulated solidified product in water, and the granulated solidified product. It is set as the structure which isolate | separates into the 2nd-stage scraper conveyor 4b conveyed to the surface of a water, and drives each independently. The main cause of the increase in power loss and the stoppage due to the biting of the foreign matter 16 in the prior art is that a single scraper chain 4 transports the ground and solidified material in water and on the water surface. Therefore, as in this embodiment, by separating each of them into independent scraper chains 4a and 4b, it is possible to suppress an increase in power loss and to prevent a stop or the like due to the biting of the foreign matter 16. .

  Furthermore, according to the scraper conveyor 4 according to the present embodiment, both the first-stage and second-stage scraper conveyors 4a and 4b have no curved portion in the conveyance direction on the conveyance side and the return side, and move the scrapers 10a and 10b linearly. By adopting such a configuration, the conveyance-side scraper press guide 7 and the return-side scraper press guide 8 that are essential in the past can be more reliably eliminated. Therefore, since the scrapers 10a and 10b do not slide in contact with the guide, it is possible to more reliably reduce the problem of power loss and the problem of stopping due to the biting of the foreign material 16.

  In particular, with respect to the biting phenomenon of the foreign matter 16, the scraper presser guide 7 is eliminated as shown in FIG. 4 so that the upper part is freely opened. Therefore, even if the foreign matter 16 exists on the bottom surface of the casing 1, the scraper 10 can get over the foreign object 16. Therefore, it is possible to prevent a phenomenon in which the foreign material 16 is bitten and the scraper 10 cannot move any more as in the conventional case. The foreign matter 16 corresponds to, for example, a large metal lump, but is not fixed to the bottom surface and is therefore carried by the scraper 10 over time.

  Further, according to the present embodiment, the tension adjusting chain wheel 6b of the second-stage scraper conveyor 4b is arranged so as to enter the lower position of the first-stage scraper conveyor 4a, and the granulated solidified product is the second-stage scraper conveyor. By adopting a configuration in which sedimentation is supplied to the connecting portion 41 of 4b, it is possible to quickly deliver the granulated solidified product from the first stage to the second stage scraper conveyor. At that time, by setting the conveyance capacity of the second-stage scraper conveyor 4b to be larger than that of the first-stage scraper conveyor 4a, it is possible to suppress the pulverized and solidified material from staying at the connecting portion 41. Furthermore, by disposing the conveyance guide member 1b, it is possible to reliably transfer the crushed solidified product to the connecting portion 41, and to prevent sedimentation to an unintended casing corner.

  Specifically, as described above, the granulated pit 1 according to the present embodiment is a first-stage and second-stage scraper conveyors 4a and 4b, each of which transports the granulated solidified product in water and transports it onto the water surface. By separating the scraper conveyors 4a and 4b so as to perform linear conveyance without changing the angle with respect to the conveyance direction, the conveyance-side scraper guide 7 as in the prior art is eliminated and the return is performed. On the side, the return side scraper guide 8 for preventing lifting due to the chain tension is unnecessary. As a result, sliding resistance can be reduced, and stopping due to foreign object biting can be prevented.

  Although the present invention has been described in detail with reference to specific embodiments, various substitutions, modifications, changes, etc. in form and detail are defined in the claims. It will be apparent to those skilled in the art that this can be done without departing from the spirit and scope. Therefore, the scope of the present invention should not be limited to the above-described embodiments and the accompanying drawings, but should be determined based on the description of the claims and equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Granulated pit casing 4a 1st stage scraper conveyor 4b 2nd stage scraper conveyor 7 Conveyance side scraper holding guide 8 Return side scraper guide 10a First stage scraper 10b Second stage scraper 11a First stage chain 11b Chain for second stage 15 Granulated solid 16 Foreign material

Claims (6)

In a granulation pit that solidifies a high-temperature melt in water and conveys the ground granulated solidified product to the surface of the water with a scraper conveyor with the bottom surface as the transport surface .
Said scraper conveyor, a first stage scraper conveyor arranged linearly in a horizontal direction for conveying the water砕固product in water, which is arranged linearly in the inclined direction to convey the water砕固product to above the water surface A granulated pit, which is separated into a second-stage scraper conveyor , and each of the first-stage and second-stage scraper conveyors has no scraper press guide and is driven independently. 2. The granulated pit according to claim 1, wherein an end of the return side of the second-stage scraper conveyor is arranged to enter a position below the first-stage scraper conveyor. The granulated pit according to claim 1 or 2 , wherein the second-stage scraper conveyor has a scraper pitch set shorter than that of the first-stage scraper conveyor. The granulated pit according to any one of claims 1 to 3 , wherein the second-stage scraper conveyor has a conveyor rotation speed set higher than that of the first-stage scraper conveyor. A pulverized and solidified material conveyance guide member, which is disposed along the conveyance direction of the first-stage scraper conveyor and whose tip extends to a position above the connecting portion of the second-stage scraper conveyor, is further disposed. The granulated pit according to any one of claims 1 to 4 . In a method in which a high-temperature melt is solidified in the water in the granulated pit, and the granulated solidified material precipitated in the granulated pit is taken out by being transported to the surface of the water with a scraper conveyor having a bottom surface as a transport surface .
The granulated solids are transported in water by a first-stage scraper conveyor that is disposed in a straight line in the horizontal direction in the granulation pit and does not have a scraper presser guide , and is separated from the first-stage scraper conveyor and independently. Taking out the granulated solidified product from the granulated pit , which is linearly arranged in the driven inclination direction and transports the granulated solidified product onto the water surface by a second-stage scraper conveyor without a scraper presser guide. Method.

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