JP2008202862A - Leakage dust treating device in rotary kiln - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a leakage dust treating device, which inexpensively treats leakage dust leaking out of a front wall part without requiring much manpower. <P>SOLUTION: This leakage dust treating device has a discharge port 16 for downward discharging the leakage dust leaking out of a clearance 14 between a kiln body 12 and a front wall 13 in the front wall 13 blocking up an upstream side opening part of the kiln body 12, and also has: a conveyor 30 supporting and transferring the leakage dust discharged from the discharge port 16 to the side; a water sprinkling device 40 sprinkling water on the leakage dust transferring by the conveyor 30; a bag holder 60 arranged just under part of a dust discharge port 32 of the conveyor 30 and detachably holding an opening part peripheral edge part 65a of a recovery bag 65; and a carrying device 70 carrying bagged goods 66 of storing the leakage dust in the recovery bag 65 held by the bag holder 60, up to a loading position to a large waste hoisting lift 8 being a treating object of a rotary kiln 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a processing apparatus for leaking dust leaking from a front wall portion in a rotary kiln used for waste incineration and melting.

Conventionally, rotary kilns are often used as furnaces for incinerating / melting waste in waste treatment facilities (see, for example, Patent Document 1, Patent Document 2, Patent Document 3, and Patent Document 4). As described in Patent Document 4, this rotary kiln is used for both an incineration process for burning and incinerating waste and a melting process for burning and melting waste by further high-temperature treatment. In the book, the above two treatments are collectively referred to as incineration / melting treatment.
JP 2000-310408 A JP 2001-311511 A JP 2002-235986 A JP 2005-265303 A

  In a rotary kiln, the waste introduced into the furnace is burned through a chute that passes through a front wall (described as a wind box in Cited Document 2) that closes the upstream opening of the cylindrical kiln body, and incinerated.・ A melting process is performed, but a phenomenon that part of this waste leaks out of the kiln body through the gap between the kiln body and the front wall is observed. The leaked matter is a powdery or granular waste that remains unburned or partially mixed in an ignited or burned state. In the present invention, the leaked matter is referred to as leaked dust.

  The leakage of the above-mentioned leakage dust cannot be prevented by the introduction of combustion air from the gap in Patent Document 2 and Patent Document 3, and combustion is performed to improve the waste combustion efficiency by the burner. When the air is introduced in the vicinity of the burner and not introduced from the gap, the leakage amount of the leaking dust becomes particularly large.

  As a method for treating this leaked dust, conventionally, an operator drops the recovered dust by dropping it into a dust box placed below the front wall, for example, about 10 times a day by a forklift into the container. When the container is full, it is transported and thrown into a waste storage pit by a container truck, and then thrown into the rotary kiln together with general waste such as sludge and paper, wood, plastic, etc., and incinerated and melted. It was. For this reason, these processing operations require a lot of manpower and time, which is not preferable in terms of labor saving, and increases the processing cost.

  The present invention has been made in view of the above points, and provides a leakage dust processing apparatus in a rotary kiln that can process leakage dust leaking from a front wall portion at a low cost without much labor. The purpose is to do.

  In order to achieve the above object, in the rotary kiln for incinerating / melting the waste thrown into the furnace through the chute, the invention according to claim 1 provides the front wall for closing the upstream opening of the kiln body, By providing a discharge port for discharging the leaked dust leaking from the gap between the kiln body and the front wall downward, supporting the leaked dust discharged from the discharge port and transferring it to the side, and the conveyor A watering device that sprays water on the leaked dust being transferred, a bag holder that is disposed immediately below the dust discharge port of the conveyor and that removably holds the peripheral edge of the opening of the collection bag, and is held by the bag holder A packaged product containing the leaked dust discharged from the dust discharge port in the collected bag is disposed of a large-scale waste that is to be processed by the rotary kiln. A transport device for transporting to a loading position for a lift for use, and charging the bagged product lifted and transported by the lift into the chute via the large waste loading section, The rotary kiln is used for incineration / melting treatment.

  According to the first aspect of the present invention, the leakage dust from the front wall portion is sprinkled by the watering device during the transfer by the conveyor, and the ignited material in the leakage dust is extinguished, which is safe. The dust falls into the collection bag held by the bag holder from the conveyor and is stored in the collection bag, and is transported to the lift loading position by the transport device as a packed product with the collection bag. Since the above-mentioned packaged product can be put into the chute using a lift for lifting large waste, there is no equipment cost, and leakage dust can be processed at low cost.

  In the present invention, various watering devices can be used as the watering device. As in the invention according to claim 2, the watering device includes a spray nozzle disposed above the conveyor, and the conveyor. If the discharged water after the sprinkling is configured to include a circulating water supply device that supplies the spray nozzle as water for watering after the solids separation process, the water sprayed from the spray nozzle in the watering device is circulated and used. Since it can be used for watering, the amount of new water supplied from the outside, consumed and discarded can be reduced.

  As described above, according to the present invention, leakage dust leaking from the front wall portion of the rotary kiln can be processed at low cost without much labor.

  In addition to the above effects, according to the invention described in claim 2, the amount of new water consumed / discarded by the watering device can be reduced, so that the processing cost can be further reduced and resource saving is also preferable.

Hereinafter, an embodiment of the present invention will be described with reference to an example shown in FIGS. FIG. 1 shows the overall configuration of a waste treatment facility 1 that incinerates and melts industrial waste (hereinafter simply referred to as “waste”). The sludge that is thrown into the receiving pit 2 by the garbage truck V and is not shown in the figure. a small waste W _1, such as shredded paper, wood and waste plastic after turning by the crusher, the large waste W ₂ to be processed is not suitable for crushing due on or crushing machine to the pit. The small waste W ₁ is thrown into the receiving hopper 4 by the crane 3, conveyed by the conveyor 5, thrown into the rotary kiln 10 through the vertical duct 6 and the chute 7, and the large waste W ₂ is taken from the temporary storage site 80. It is transported upward by a lifting lift 8, inserted into a rotary kiln 10 through a lateral duct-shaped charging portion 9 and a chute 7, and incinerated and melted by combustion of a burner 11 or the like. 6a is a double gate provided in the vertical duct 6, and 9a is a double gate provided in the charging portion 9, both of which are of direct acting type. In order to fed large waste W ₂ on the lift 8 rise state to loading section 9 through to chute 7, pushers (not shown) is used.

  The melt that has flowed out from the downstream end of the kiln main body 12 that is rotated by a rotary support / drive mechanism (not shown) of the rotary kiln 10 is introduced into the slag cooling water tank 22 from the discharge duct 21 at the lower part of the secondary combustion tower 20 and is granulated. It is discharged from the discharge port 23 as slag. Further, the combustion exhaust gas of the rotary kiln 10 flows into the exhaust gas treatment facility (not shown) connected to the exhaust port 25 after secondary combustion in the secondary combustion chamber 24 of the secondary combustion tower 20 to make the exhaust gas harmless and collect dust. After being performed, it is discharged into the atmosphere.

  1 to 3, reference numeral 13 denotes a front wall that closes the upstream opening of the kiln main body 12 of the rotary kiln 10, which is fixed on the foundation by a support frame (not shown) and has a short cylindrical shape on the inner surface of the casing portion 13a. A refractory material 13 b is attached, and a gap 14 is formed between the outer peripheral surface of the refractory material 13 b and the inner peripheral surface of the upstream end portion of the kiln main body 12. The chute 7 and the burner 11 pass through the front wall 13, and 15 is an air blowing port that also passes through the front wall 13 and is connected to a combustion air supply source (not shown). Reference numeral 16 denotes a discharge port opened downward in the lower portion of the front wall 13 (casing portion 13a) for discharging downward the leaked dust leaking from the gap 14, and 17 is for discharging control. This is a butterfly valve type double damper.

  On the other hand, 30 is a conveyor composed of a belt conveyor whose base end side conveying surface (belt upper surface) is located below the discharge port 16 of the front wall 13, and in this example is inclined so that the conveying direction is obliquely upward. The casing 31 is opened upward. As the conveyor belt of the conveyor 30, for example, a metal small pitch mesh belt is preferably used so that it can withstand leaked dust in an ignited state. 32 is a dust discharge port provided in the casing 31 below the tip of the conveyor 30, and 33 is a drain port provided on the bottom surface of the lower end of the casing 31.

  40 is a watering device that sprinkles water on the conveyor surface of the conveyor 30, spray nozzles 41 and 42 that are disposed on the casing 31 with the outlets facing the conveyor surface of the conveyor 30, and water supply that supplies water to these spray nozzles Device 50. As the spray nozzles 41 and 42, it is particularly preferable to use a full-cone spray nozzle having a full-cone spray pattern so that spray water is sprayed over a wide range on the leaked dust on the conveyor belt. In this example, a spray nozzle 43 is additionally used for cleaning the bottom surface of the casing. The spray nozzle 43 is disposed obliquely downward along the bottom surface of the casing 31. The spray nozzle 43 is also used as a water supply device. 50.

  In this example, the water supply device 50 is a circulating water supply device that supplies water after spraying from the spray nozzles 41 and 42 (and spray nozzle 43 in this example) as water for spray nozzle spraying after solid matter separation processing. The configuration is as shown in FIG. That is, 51 is a recovery tank disposed below the drain port 33 of the conveyor 30, 52 is a recovery pump, 53 is a relay tank having an overflow wall in the middle, and 54 is garbage in the recovery liquid from the recovery pump 52. A wire mesh filter for filtering water, 55 is a transfer pump, 56 is a water spray tank with a partition wall in the middle, and 57 is an open / close valve (float valve) that automatically adjusts the water level for replenishing water. Has been. A watering pump 58 is connected to the lower part of the end wall of the watering tank 56, and its discharge side is connected to the spray nozzles 41, 42, 43 through a pipe 59.

  Next, as shown in FIG. 2, the opening peripheral portion 65a of the collection bag 65 for collecting the leaked dust is detachable directly below the dust discharge port 32 from which the leaked dust transferred by the conveyor 30 is discharged. In this example, as shown in FIG. 4, the bag holder is fixed on a pallet 71 constituting a transfer device 70 described later. In FIG. 4, 60 a is a holding ring portion of the bag holder 60, and an opening peripheral portion 65 a of the collection bag 65 inserted through the inside of the holding ring portion 60 a and placed on the pallet 71 is indicated by an arrow R. The collection bag 65 can be held in an upwardly opened state by folding it outward by hand, and after the leakage dust is accommodated, the folded state is changed from the above-mentioned folded state to the original upright state or opening portion. By setting the squeezed state, the collection bag 65 is released from being held by the bag holder 60 and can be taken out sideways as will be described later. Further, as the collection bag 65, a resin bag such as a vinyl bag is preferably used, but a bag made of other materials such as cloth can also be used.

As shown in FIGS. 2 and 4, 70 conveys the packed product 66 containing the leaked dust D in the collection bag 65 to the loading position on the lift 8 for lifting the large waste W _2. A pallet 71 with a free roller, a chain conveyor 72 that transports the pallet 71 in the lateral direction, and the top surface of the pallet 71 that has been transported is the top surface of the lifting platform 8a of the lift 8 at the lower end position. And an electric pallet lifter 73 that is driven up to the same level position. Reference numeral 81 denotes a temporary placement table with an electric roller conveyor that is interposed between the raised pallet 71 and the lift 8 to temporarily place the packaged product 66. The bag 66 on the pallet 71 may be transferred manually onto the temporary table 81, but in this example, it is performed by an electric pusher (not shown).

  Next, a method for treating leaked dust by the apparatus having the above configuration will be described. First, when processing the leaked dust, the conveyor 30 and the water sprinkler 40 are activated and put into operation, and the chain conveyor 72 stops and holds the pallet 71 and the bag holder 60 directly below the dust discharge port 32. The above-described folding operation of the opening peripheral edge portion 65a of the collection bag 65 is performed on the tool 60, and the collection bag 65 is set in a holding state that opens upward.

In the rotary kiln 10, the above-described small waste W ₁ and large waste W ₂ are incinerated and melted. As a result, the leaked dust leaked from the gap 14 between the kiln main body 12 and the front wall 13 is The double damper 17 is dropped from the open outlet 16 and transferred to the side by the conveyor 30. During this transfer, the ignited matter in the leaked dust is extinguished by water spraying from the spray nozzles 41 and 42, and a safe wet state is obtained. Then, it falls into the collection bag 65 from the dust discharge port 32 and is accumulated.

  When the amount of dust leaked in the collection bag 65 becomes an appropriate amount, the operation of the conveyor 30 and the watering device 40 is temporarily stopped, the double damper 17 is also temporarily closed, and the start switch of the transport device 70 is operated. The chain conveyor 72 automatically moves the pallet 71 to a position above the pallet lifter 73, and the pallet lifter 73 subsequently moves up to the same level as the temporary placement table 81 by the pallet lifter 73. The collection bag 65 containing leaked dust, that is, the bag containing the leaked dust D, which has been manually released from the holder 60 and released from the peripheral edge portion 65a of the collection bag 65 and released from being held by the bag holder 60. The filling 66 is used. If this bag 66 is pushed to the side by a pusher (not shown) as indicated by an arrow X (see FIG. 2) and transferred from the pallet 71 to the temporary table 81, the leakage dust for one collection bag is obtained. The transport process ends. Although the upward opening of the collection bag 65 containing the leaked dust released from the holding by the bag holder 60 can be obtained as a self-supported bag 66 in a state of being squeezed as it is or by hand, You may make it hold | maintain an aperture shape by stopping the aperture | diaphragm | squeezed opening part with an adhesive tape.

  Therefore, the pallet 71 is returned to the position directly below the dust discharge port 32 by the transport device 70 in the reverse path, and the operation of attaching the new collection bag 65 to the bag holder 60 and restarting the operation of the conveyor 30 and the water sprinkler 40 are performed. And the operation of opening the double damper 17 may be performed, and the same leakage dust treatment as described above may be repeated.

Sacked products 66 on the provisional table 81 is transferred onto the lifting table 8a of timely lift 8, such as by mixed and large waste W ₂ elevated transported and poured into the chute 7 via a loading section 9 Then, it is subjected to incineration and melting treatment with the rotary kiln 10.

As described above, the operations necessary for the treatment of the leaked dust include attaching / detaching the collection bag 65 to / from the bag holder 60, starting / stopping the devices such as the conveying device 70 and the conveyor 30 and opening / closing the double damper 17. , because it is light work that requires only a short period of time, workers of labor is only a small, and since the bag packed goods 66 can be put into the chute 7 by using the lift 8 for large waste W _2, or even equipment costs Therefore, the leakage dust can be processed at low cost.

  On the other hand, the operation of each part in the sprinkler 40 parts and the water supply apparatus 50 will be described. Water sprayed from the spray nozzles 41 and 42 onto the leaked dust being transferred by the conveyor 30 extinguishes the leaked dust as described above. The water is sprayed downward from the casing 31 in a state containing a small amount of leaking dust, and the water sprayed from the lower spray nozzle 43 forms leaking dust that tends to accumulate at the bottom of the casing 31. It flows to the drain outlet 33 in a swept form and flows into the recovery tank 51 together.

  The recovered liquid in the recovery tank 51 is pumped up by the recovery pump 52, and after flowing through the filter 54, flows into the relay tank 53, where the amount of contained dust is reduced by sedimentation and overflows the overflow wall. The recovered liquid flows into the sprinkling tank 56 by the transfer pump 55, and dust precipitation is further promoted by the partition wall, and the contained dust content is reduced to a level that does not hinder the spraying by the spray nozzle. It is supplied to the spray nozzles 41, 42, and 43 through the pipe 59 and reused.

  Dust collected at the bottom of each tank after a long period of use is discharged from the bottom of the tank in a timely manner, and if necessary, after a sedimentation separation process in a sedimentation basin, etc., along with other objects to be treated such as sludge. What is necessary is just to use for incineration and a melting process.

  If the water supply device 50 in the form of a circulating water supply device composed of the tanks and the like is used, the water sprayed by the spray nozzle can be used for water spraying, and the replenishing amount of water by the opening / closing valve 57 can also be used. Because less is required, processing costs are lower.

  The present invention is not limited to the above example. For example, the shape of the bottom portion of the casing 31 of the conveyor 30 may be changed or a scraper for cleaning the bottom portion may be attached, and the spray nozzle 43 at the bottom portion may be omitted. . In the above example, the conveyor 30 and the conveying device 70 are arranged on a straight line in a plan view. However, the conveyor 30 and the conveying device 70 may be arranged on a bent line. It is good also as what forms. Further, in the conveying device 70, the pallet 71 is provided with a pusher or an electric roller conveyor, the lifting / lowering conveying means such as the pallet lifter 73 is omitted depending on the level of the lowermost stop position of the lift 8, or the pallet is not used. The specific configuration may be other than the above, such as a type in which the collection bag 65 or the bag-filled product 66 containing the leaked dust is directly conveyed by a conveyor.

Further, the bag holder 60 may have a shape other than the above, and besides being attached to the pallet 71 as described above, the bag holder 60 is fixedly disposed on the base frame of the chain conveyor 72 or the ground directly below the dust discharge port 32. In this case, the collection bag 65 containing the leaked dust is first released from the holding by the bag holder 60, and is loaded into the lift by the conveying device 70 in the form of a bag-packed product 66 (in the above example, the temporary storage table). 81)). Alternatively, the temporary placement table 81 in the above example may be omitted, and the packaged product 66 may be loaded directly onto the lift 8 from the conveyance end (on the raised pallet 71 in the above example) by the conveyance device 70, the bagged product 66 is transported to the temporary depot 80 of a large waste W ₂ (see FIG. 1) with large waste W ₂ may be loading onto the lift 8.

  Further, the water supply device 50 constituting the circulation water supply device may have a tank configuration other than the above, and when only new water from the outside is used for watering, the relay tank 53 and the watering tank 56 (and drainage) are used. If it is not temporarily stored, the tank corresponding to the recovery tank 51 may not be used.

1 is a schematic longitudinal sectional view of a waste treatment facility showing an example of an embodiment of the present invention. It is a detailed longitudinal cross-sectional view which shows each apparatus of the lower part of the rotary kiln in FIG. It is an AA line expanded sectional view of the front wall part in FIG. It is a perspective view of the conveying apparatus in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 8 ... Lift, 10 ... Rotary kiln, 12 ... Kiln main body, 13 ... Front wall, 16 ... Discharge port, 30 ... Conveyor, 32 ... Dust discharge port, 40 ... Sprinkler, 41 ... Spray nozzle, 42 ... Spray nozzle, 50 ... Water supply device, 51 ... Recovery tank, 53 ... Relay tank, 55 ... Transfer pump, 56 ... Sprinkling tank, 58 ... Sprinkling pump, 59 ... Piping, 60 ... Bag holder, 65 ... Recovery bag, 65a ... Periphery of opening, 66 ... Packed product, 70 ... Conveying device, 71 ... Pallet, 72 ... Chain conveyor, 73 ... Pallet lifter, 81 ... Temporary table

Claims (2)

In a rotary kiln that incinerates and melts the waste thrown into the furnace through a chute,
In the front wall that closes the upstream side opening of the kiln body is provided with a discharge port for discharging the leaked dust leaking from the gap between the kiln body and the front wall downward,
A conveyor for supporting and transferring the leaked dust discharged from the discharge port to the side;
A sprinkler for spraying water on the leaked dust being transferred by the conveyor;
A bag holder that is disposed immediately below the dust discharge port of the conveyor and detachably holds the peripheral edge of the opening of the collection bag; and
Loading position of a packaged product containing leakage dust discharged from the dust discharge port in the collection bag held by the bag holder into a lift for lifting large-scale waste that is a target of processing of the rotary kiln And a transport device that transports up to
The bagged product that has been lifted and transported by the lift is put into the chute through the large-sized waste charging section, and is used for incineration / melting treatment by the rotary kiln. A processing device for leaking dust in a rotary kiln.   The watering device supplies the spray nozzle disposed above the conveyor, and the circulating water supply device that supplies the water after the water discharged from the conveyor to the spray nozzle as the water for watering after the solids separation process. The processing apparatus of the leakage dust of Claim 1 consisting of these.

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