JP6086247B2 - Granulated slag conveyor - Google Patents

Description

  The present invention relates to a granulated slag transfer device used in a water granulating apparatus that performs a water granulating process on molten slag discharged from a waste gasification melting furnace or an ash melting furnace.

  In waste treatment facilities, etc., pyrolysis gasification melting furnace equipment, equipment combining a waste incinerator and ash melting furnace, etc. are used. Residues after pyrolyzing waste in these equipment The incinerated ash is melted and the discharged molten slag is contacted with cooling water by a water granulator connected to these facilities to cool and solidify the molten slag to form granular slag. The grinding process is performed to adjust the process and the predetermined particle size range. Slag after water granulation, magnetic separation, and grinding treatment (hereinafter referred to as “water granulated slag”) is used as an aggregate of civil engineering materials such as road pavement materials and secondary concrete products.

  The granulating apparatus is provided with a granulated slag conveying apparatus in which a scraper is attached to an endless conveyor chain with an interval in the running direction in a granulating tank containing cooling water for cooling. Such a granulated slag conveying apparatus is disclosed in Patent Document 1, for example. In Patent Document 1, a horizontally elongated granulating tank is formed with a slag receiving port that receives falling molten slag opened upward, and one end in the longitudinal direction (lateral direction) of the granulating tank is in the granulated water. The said conveyor chain is provided in the lower position of the granulation tank so that it may drive | work toward the other end side from the side. The endless conveyor chain forms a lower traveling portion that extends in the lateral direction and travels toward the other end side and an upper traveling portion that travels toward the one end side, and changes the traveling direction between the one end side and the other end side. In this case, the vehicle travels along a circulation path that connects the lower traveling unit and the upper traveling unit. As described above, the scraper is attached to the conveyor chain at intervals in the traveling direction of the conveyor chain, and when the scraper moves in the lower traveling section, the scraper removes the granulated slag accumulated on the bottom plate of the granulating tank. Scrape and move to the other end. On the other end side of the granulation tank, a discharge part is provided, and the granulated slag is discharged out of the tank.

  The conveyor chain in the granulated slag transport device is generally located in the vicinity of the tank side walls on opposite sides in the tank width direction (the width direction of the granulated tank) that is perpendicular to the traveling direction, On the other hand, as a rotation guide body attached to a shaft supported by bearing portions provided at a plurality of positions in the traveling direction, traveling guidance is provided by a pair of pulleys facing each other in the tank width direction. The pulleys constituting the pulley pair as the rotation guides are attached to shafts supported respectively on the corresponding tank side walls in a state of being separated and independent from each other. The pulleys of the pulley pair at the same position in the traveling direction and facing in the tank width direction are not attached to one shaft as a common shaft and are separated and independent from each other. This is because if there is a shaft between the pulleys, interference with a transported object such as granulated slag in the granulated water occurs. The bearing part that supports the shaft to which each pulley of the pulley pair is attached has a relationship in which slag is present in the granulated water from coarse slag to fine slag, so that the fine slag enters the bearing part. A seal member is provided to prevent this.

JP 08-187485

  However, the shaft to which the pulley is attached is located in the granulated water, and is always in contact with the fine slag that floats and flows in the granulated water, so despite the fact that the seal portion is applied, Fine slag may enter between the shaft and the bearing portion. Although fine slag is suspended in the granulated water, it also settles, so that the lower part is more dispersed in the lower part than in the upper part and the lower part of the granulation tank. As described above, the conveyor chain, that is, the pulley that travels and guides the conveyor chain is located in the lower part of the granulating tank, so that there are more floating fine slags in contact with the pulley than in the upper part. Therefore, the possibility that fine slag enters the bearing portion is high. Even if a small amount of this fine slag is caught between the shaft and the bearing portion, not only the shaft or the surface of the bearing is damaged, but also the rotation of the shaft is reduced or stopped. The occurrence of such an obstacle in the rotation of the shaft also inhibits the rotation of the pulley.

  For example, when the rotation of one pulley is reduced or stopped among the pulleys at a plurality of positions, the conveyor chain on the side where the rotation of the pulley is reduced or stopped slides on the pulley whose rotation is reduced or stopped. As a result, there is a problem in that the pulley is unevenly worn by the conveyor chain.

  Since a large amount of water is stored in the granulation tank, it is necessary to drain water for the pulley replacement work, which causes a problem that the furnace must be stopped for a long time. ing.

  In view of such circumstances, the present invention is one pulley of a pair of pulleys that are separated from each other in the width direction of the water granulating tank. It is an object of the present invention to provide a granulated slag conveying device that can automatically cope with this even when rotation tends to be hindered, recover normal rotation, or minimize the decrease in rotation.

  The granulated slag conveying apparatus according to the present invention is a method for granulating granulated slag produced by cooling and solidifying molten slag falling into a granulating tank after being discharged from a melting furnace with granulated water in the granulating tank. It conveys to the slag discharge position toward the other end side from the one end side in the longitudinal direction of the tank.

  In such a granulated slag transfer device, in the present invention, a lower traveling unit that travels along the bottom plate of the granulated tank from the one end side to the other end side in the granulating tank, and an upper side than the lower traveling unit. An upper end traveling portion that continuously travels from the other end side toward the one end side at the position, and an endless circulating traveling body that circulates between the one end side and the other end side, Provided at two positions separated in the tank width direction perpendicular to the traveling direction of the endless circulating traveling body and parallel to the surface of the bottom plate, and separately traveling and guiding the endless circulating traveling body at the two positions, respectively. The endless circulation traveling body is provided with a rotation guide body that is independently engaged at a plurality of positions in the traveling direction, and includes a rotation driving body that rotationally drives the rotation guide body that is engaged with at least one endless circulation traveling body, With a predetermined interval in the traveling direction of the endless circulating traveling body A scraper attached to the two endless circulating traveling bodies at several positions is provided, and the endless circulating traveling body travels so that the scraper is positioned at the lower traveling portion. The scraper is configured to scrape and move the granulated slag accumulated on the bottom plate of the granulation tank toward the other end, and the rotation attached to the endless circulation traveling body in the two positions. The guide bodies are connected to each other through the rotational force transmitting means provided outside the granulation tank, and the rotation guide bodies positioned corresponding to each other in the traveling direction of the endless circulation traveling body. It is characterized by being able to communicate with.

  In such a granulated slag device, for the reasons already described, the rotating guide bodies that are opposed to each other in the width direction of the granulated tank are arranged separately from each other. Therefore, since the pulley rotation trouble due to the biting of the fine slag hardly occurs at the same time in the two pulleys in the pair, according to the present invention, the rotational force of the normally rotating pulley is Is transmitted to the opposite pulley via the rotational force transmitting means. As a result, the opposite pulley is forcibly rotated, and the fine slag that has been bitten is further pulverized and atomized to drive out the bearing portion, and as a result, it recovers to normal rotation, or The rotation decrease is minimized, and rotation failure of the pulley due to fine slag intrusion into the bearing portion is prevented or minimized.

  As described above, the present invention synchronizes the rotation by connecting the rotation guide bodies for the endless circulating traveling bodies on both sides of the conveyor of the granulated slag transporting device via the rotation transmission means outside the granulation tank. Therefore, the following effects can be obtained.

  (1) It is possible to avoid the trouble that the rotation guide body is fixed due to the fine slag that has entered the bearing portion of the rotation guide body, and it is possible to prevent the rotation guide body from being worn or damaged.

  (2) Long-term stable operation of the water granulator equipped with the water granulated slag transport device is possible, and equipment failures are reduced, so that the burden on the operation monitoring and maintenance management of the operator can be reduced.

  (3) Since it is a simple structure, it can be applied to an existing granulated slag transfer device, and it is also easy to work because it requires additional construction outside the tank.

  (4) Compared to the conventional case, the repair cost of the granulated slag transfer device can be greatly reduced.

It is a longitudinal cross-sectional view of the granulation apparatus provided with the granulation slag conveyance apparatus as one Embodiment of this invention. It is an AA line expanded sectional view in FIG. FIG. 1 and FIG. 2 are an enlarged view of an endless circulating member and a scraper of the apparatus, where (A) is a plan view and (B) is a side view.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

  As shown in FIG. 1 which is a vertical cross section of the slag transport device of the present embodiment, two side walls which are opposed in the tank width direction (perpendicular to the paper surface in FIG. 1) in the water granulating tank 10. 15, two chains 31, 31 as endless circulating traveling bodies, which are travel-guided at positions along the side wall 15 by a plurality of pulleys 20 (pulleys 21 to 26) as respective rotation guide bodies provided in the vicinity of 15. Rotate at least one of the plurality of scrapers 40 attached to the two chains 31 at intervals in the travel direction of the chain and at least one of the plurality of pulleys 20 as the rotation guide body. A motor with a speed reducer disposed outside the tank as the rotational driving body 50 to be driven, and a rotational force transmitting means 60 disposed outside the tank so as to transmit the rotational force of the pulley 25 are provided. The scraper 40 scrapes and moves the granulated slag accumulated on the bottom plate 11A of the granulating tank 10 as the chain 31 travels. Each member and means will be described in detail below.

  The water granulating tank 10 includes a tank body 11 having a side surface shape whose longitudinal direction is the horizontal direction in FIG. 1, and an inclined part 12 that is further inclined to incline upward from the left part of the tank body 11. ing. In the water granulating tank 11, the right end side that is one end side of the tank main body 11 is closed, and the left end side of the inclined portion 12 that is the other end side is opened as a discharge port 12A.

  The tank body 11 is provided with a slag receiving port 13 opened upward at the upper part thereof, so that the molten slag from the melting furnace is dropped into the tank body 11 through the slag receiving port 13. It has become.

  In this granulating tank 10, granulated water W for cooling the falling molten slag is stored so that the water surface is positioned near the slag receiving port 13 in the vertical direction. The water surface of the crushed water W is located at an intermediate position in the height direction with respect to the inclined portion 12. Such a granulating tank 10 is supported by a plurality of support columns 14 fixedly installed on the floor surface at appropriate places.

  As will be described later with reference to FIG. 2, the water granulating tank 10 is a bearing portion attached to each outer wall surface of two side walls 15 facing in the tank width direction and parallel to the paper surface of FIG. 1. A shaft for rotating a pulley 20 provided in the granulating tank 10 as a guide body is rotatably supported. As the pulley 20, a plurality of pulleys 21 to 26 are provided. As shown in FIG. 1, the pulley 21 is disposed at the upper end portion of the inclined portion 12 serving as the other end portion of the water granulating tank 10, and the water granulating tank The pulley 22 is positioned at the upper right end of the tank main body 11 which is one end of 10, and the chain 31 as the endless circulation traveling body is between the pulleys 21 and 22 and the inner wall surfaces of the two side walls 15. The chain 31 has a lower traveling portion 31A and an upper traveling portion 31B. Between the pulley 22 on the one end side and the pulley 21 on the other end side, the bottom plate of the tank body portion 11 is located at each of the transition position from the tank body portion 11 to the inclined portion 12 and the lower position of the pulley 22 at the one end portion. Pulleys 25 and 26 for changing the direction of the chain 31 with respect to the lower traveling portion 31A and pulleys 23 and 24 for changing the direction of the upper traveling portion 31B are disposed at fixed positions at two positions that move up and down near 11A. ing.

  The pulleys 25 and 26 and the pulleys 23 and 24 are respectively located above the lower traveling portion 31A and the upper traveling portion 31B of the chain 31, and press the chain 31 downward to change the direction of the chain 31. And giving tension. The initial tension application of the chain 31 and the tension readjustment to eliminate looseness after long-term use are performed by adjusting the position of at least one of the pulley 22 and the pulley 24 on one end side.

  In this way, the chain 31 stretched and turned around the pulley 20 (pulleys 21 to 26) is within the range of the tank body 11 and between the pulley 25 and the pulley 26, as described above, the tank body. 11 and the lower traveling portion 31A traveling along the bottom plate 11A, and a parallel path with respect to the lower traveling portion 31A between the pulley 23 and the pulley 24 at a position above the lower traveling portion 31A. And an upper traveling portion 31B that travels in the manner described above.

  Of the pulleys 21 to 26, at least the pulleys 23 to 26 located in the middle in the longitudinal direction of the water granulating tank 10 are both bearing parts 16 provided on the two side walls 15 and 15 of the water granulating tank 10. However, the pulley shafts 17 facing the tank width direction at the same position in the traveling direction of the chain 31 are separated from each other and are not connected. On the other hand, the pulleys 21 and 22 located at both ends in the longitudinal direction may be connected by a common shaft extending between the two side walls 15 and 15, or may be separated as in the case of the other pulleys 23 to 26. Good.

  Outside the water granulating tank 10, a motor 50 with a speed reducer as a rotational driving body for driving the pulley 21 is disposed in the vicinity of the pulley 21 positioned at the upper end at the other end of the water granulating tank 10. ing. The two pulleys 21 positioned and opposed to the two side walls 15 and 15 are connected to the shafts 17 and 17 for the two pulleys 21 and 21 as a common shaft as in the case of the pulley 25 described above. In the former case, the rotational driving force of the motor 50 with a speed reducer need not be transmitted to one pulley 21, whereas in the latter case, the opposite Must be transmitted to each of both pulleys. Further, a rotational force transmitting means 60 is disposed outside the granulating tank 10 in the vicinity of the pulley 25 located below the granulating tank 10 and in the middle of the traveling direction of the chain 31. The transmission means 60 will be described later together with the chain 31, the scraper 40, the pulley 25, the shaft 17 and the bearing portion 16, based on FIG. 2.

  Since the shaft itself and the bearing portion itself for each of the pulleys 21 to 26 have substantially the same support structure for each of the pulleys 21 to 26, the pulley 25 related to the rotational force transmitting means 60 will be described here. To do.

  As described above, the pulleys 25 and 25 positioned corresponding to the two side walls 15 and 15 of the water granulating tank 10 are attached to shafts 17 and 17 that are separated and independent from each other in the tank width direction. Shafts 17 and 17 are supported by corresponding bearing portions 16 and 16. In FIG. 2, the two pulleys 25, 25 facing each other in the tank width direction, the structure of the bearing portion 16 that supports these pulleys, and the structure of the rotational force transmitting means 60 are both symmetrical in FIG. Therefore, the description will be made in relation to one pulley 25.

  The side wall 15 of the water granulating tank 10 is formed with a window portion 15A having a size suitable for inserting a pulley 25 attached to the inner end of the shaft 17 from the outside of the tank into the tank. A bearing portion 16 is fixedly attached to the outer peripheral portion of the portion 15 </ b> A with a mounting screw via a packing 18 on the outer surface of the side wall 15. The bearing portion 16 includes a cylindrical body portion 16A having a flange portion, a thin cylindrical bearing metal 16B disposed on the inner diameter surface of the cylindrical body portion 16A, for example, impregnated with lubricating oil, and the flange portion. A sealing member 16C provided on the inner side in the axial direction and a lid member 16D attached on the outer side in the axial direction are provided. The lid member 16D has a shaft hole formed therein, and the outer end portion of the shaft 17 passes through the shaft hole. The sealing member 16C maintains a sealed state with the cylindrical body portion 16A. The bearing metal 16B is rotatably supported. That is, the shaft 17 penetrating the bearing portion 16 has a pulley 25 attached to an inner end located in the water granulating tank 10, and is located outside the water granulating tank 10 at the outer end. An outer pulley 27 is attached. It is sufficient that the outer pulley 27 is attached to the shaft 17 for the pulley 25. However, in consideration of the use of the outer pulley 27 in addition to the outer pulley 27 attached to the shaft 17 for the pulley 25, It may also be attached to the shafts for the other pulleys 23, 24, and 26.

  The pulley 25 located in the water granulating tank 10 has a guide groove 25A formed on the outer peripheral surface thereof, and guides the chain 31 by the guide groove 25A. As described above, the pulley 25 is disposed close to the inner wall surfaces of the side walls 15 and 15 in the tank width direction, so that the chains 31 and 31 guided by the pulleys 25 and 25 are also side walls. 15 and 15 are located close to the inner wall surfaces.

  As shown in FIG. 2, a flat strip-shaped scraper 40 is attached to the chains 31, 31 that run close to the side walls 15, 15 on both sides as shown in FIG. 2. As shown in FIG. 1, the scraper 40 is attached to the chain 31 at regular intervals in the traveling direction of the chain 31. In FIG. 1, the scraper 40 is illustrated only for a part of the chain 31, and illustration of other parts is omitted. 2 shows only one scraper 40, and FIGS. 3A and 3B show only the end portions of the two scrapers 40 that are attached to one chain 31. FIG. As shown in FIGS. 2 and 3A, the scraper 40 has a flat plate shape having a plate surface that is long in the tank width direction and perpendicular to the running direction of the chain. ), The end portions are held by the chains 31 and 31 at corresponding positions in the longitudinal direction. As shown in FIG. 3B, the scraper 40 held by the chains 31 and 31 is positioned in close proximity to the bottom plate 11A of the water granulating tank 10 although its lower edge is not in contact with the chain 31. Since it moves with traveling, the slag S deposited on the bottom plate 11A is scraped and moved.

  Of the shafts supporting the pulleys 23 to 26 located at the lower part of the tank body 11 of the water granulating tank 20, in the present embodiment, the chain 31 travels below the chain 31 at a position where the tank body 11 moves to the inclined portion 12. The above-described rotational force transmitting means 60 is connected to the outer pulley 27 attached to the shaft 17 for the pulley 25 that travels and guides the portion 31A.

  As shown in FIG. 2, the rotational force transmitting means 60 is formed between the outer pulleys 27, 27 attached to the shafts 17, 17 of the pulleys 25, 25 located corresponding to the side walls 15 on both sides of the granulating tank 10. Thus, it is provided so that the rotational force can be transmitted outside the tank.

  The rotational force transmission means 60 is connected to two transmission shafts 61 having an axis 61A parallel to the axis 17A of the shaft 17 to which the pulley 25 is attached by a joint 62 and is fixedly installed on the floor surface. The transmission shaft 61 is rotatably supported by a bearing box 63, and a transmission pulley 64 having the same form as the outer pulley 27 is attached to the ends of both transmission shafts 61, and the transmission pulley 64 and the outer pulley 27 are attached. And a chain 65 is stretched. With this configuration, the rotational force is transmitted between the two outer pulleys 27, 27 located outside both the side walls 15, 15 via the rotational force transmitting means 60.

  In such an apparatus of the present embodiment, the molten slag is cooled and solidified by water granulation in a water granulation tank in the following manner, and is carried out of the tank.

  In FIG. 1, the molten slag from the melting furnace is dropped into the granulation tank 10 through the slag receiving port 13. Granulated water W is stored in the granulating tank 10, and the molten slag that has fallen is cooled, solidified and pulverized by rapid cooling by the granulated water and the impact force when entering the granulated water. It becomes a granulated slag. The granulated slag exists from coarse particles having a large particle size to small powdery particles. The granulated slag settles in the granulated water and accumulates on the bottom plate 11A of the granulating tank 10, but in the granulated water disturbed by the running of the chain 31, a part of the fine granulated slag is in the granulated water. Float.

  In the water granulating tank 10, along with the travel of the chain 31 along both side walls 15, a plurality of scrapers 40 attached to the chain 31 circulate in the tank, and the chain 31 travels through the lower traveling portion 31A. When traveling, the scraper 40 in the lower traveling portion 31A scrapes the granulated slag S accumulated on the bottom plate 11A and moves it on the bottom plate 11A from one end side to the other end side of the granulating tank 10, The granulated slag is brought to the discharge port 12A on the other end side, and dropped and discharged from the discharge port 12A to the outside of the tank (see FIG. 3).

  As described above, the shafts and bearing portions for the pulleys 21 to 26 have substantially the same support structure, and as described for the pulley 25 related to the rotational force transmission means 60, which is one of them, Since the bearing member 16 is provided with the seal member 16C, the fine slag floating in the granulated water is prevented from entering between the bearing portion 16 and the shaft 17 as a foreign substance. However, during the long-term use of the apparatus, the fine slag may intrude due to the deterioration of the seal member 16C. If such fine slag enters the bearing portion 16, the fine slag is caught between the bearing metal 16B and the shaft 17 and not only damages the surface of the bearing metal 16B or the shaft 17, but also frictional force. As a result of this rapid increase, a situation in which the rotation of the pulley 25 is reduced or stopped is caused. Since the chain 31 is guided by another pulley that is normally rotating and travels at a normal speed, if the fine particle slag is left in a state where it is bitten, the rotation of the chain 31 decreases or stops. When the pulley 25 is slipped and the pulley 25 wears, particularly the pulley is damaged, and the pulley is not rotating, the bearing portion 16 is rotated. This causes a problem of power loss due to an increase in frictional force.

  In view of such a problem, in the present invention, as described above, the pulleys 25 and 25 which are opposed to each other in the side walls 15 and 15 on both sides are opposed to each other in the width direction of the water granulating tank 10. The shafts 17 and 17 are connected via the rotational force transmitting means 60 outside the tank. The above-described biting of the fine slag into the bearing portion 16 hardly occurs at the same time on the shafts 17 of both pulleys 25, 25, and the timing of biting is shifted in time. Accordingly, even if the fine slag is caught in the bearing portion 16 in one pulley 25, the other pulley 25 is normally rotated without such a situation at that time. Accordingly, the rotational force of the shaft 17 supporting the other pulley 25 that is rotating normally is transferred to the one pulley via the outer pulley 27 and the chain 65 outside the tank and the rotational force transmitting means 60. 25 is transmitted to the shaft 17 supporting 25. The shaft 17 of the one pulley 25 that receives the rotational force from the other pulley receives the rotational force, and further restarts the rotation by making the fine slag bitten further fine, or the fine slag is turned into the bearing portion 16. Try to drive outside and resume rotation. As a result, the one pulley 25 returns to the normal rotation state or is close to the normal rotation state.

10 Granulating tank 11A Bottom plate 20 Rotating guide (pulleys 21 to 26)
25 Rotating guide (pulley 25)
31 Endless traveling body (chain 31)
31A Lower traveling unit 31B Upper traveling unit 40 Scraper 50 Rotating drive (motor 50 with speed reducer)
60 Rotational force transmission means

Claims (1)

The granulated slag that is produced by cooling and solidifying the molten slag that falls into the granulation tank after being discharged from the melting furnace by the granulated water in the granulation tank is converted from one end side to the other end in the longitudinal direction of the granulation tank. In the granulated slag transport device that transports to the slag discharge position toward the side,
A lower traveling part that travels along the bottom plate of the water granulation tank from the one end side to the other end side in the water granulation tank, and from the other end side to the one end side at a position higher than the lower traveling part. And an upper end traveling part that continuously travels and travels between the one end side and the other end side, and the endless circulating traveling body travels at right angles to the traveling direction of the endless circulating traveling body. Are provided at two positions separated in the tank width direction parallel to the surface of the bottom plate, and are independently engaged with each endless circulation traveling body so as to separately guide the endless circulation traveling body at the two positions. Rotating guide bodies to be provided at a plurality of positions in the traveling direction,
A rotation drive body that rotationally drives a rotation guide body that engages with at least one endless circulation traveling body;
A plurality of positions with a predetermined interval in the traveling direction of the endless circulating traveling body, and a scraper attached so as to span the endless circulating traveling body at the two positions;
When the endless circulating traveling body travels and the scraper is positioned at the lower traveling portion, the scraper directs the granulated slag accumulated on the bottom plate of the granulating tank toward the other end. Scraped and moved.
The rotation guides attached to the endless circulation traveling body in the two positions are connected to each other through rotational force transmitting means provided between the rotation guide bodies positioned correspondingly in the traveling direction of the endless circulation traveling body. A granulated slag transfer device, which is connected and capable of transmitting a rotational force to each other outside the granulation tank.

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