JP2009243833A - Granular material transfer chute - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain abrasion of an inclined plate caused by granular material and to hold down the running cost in a chute for sliding and transferring the granular material obliquely downward. <P>SOLUTION: This chute 21 is adapted to transfer solid slug or the like generated by water-cooling and solidifying molten slug discharged from a melting furnace obliquely downward by its head load. An inclined surface 26 receiving the granular material in the chute 21 is provided with a plurality of weirs 27 for stopping the flow of the granular material at preset spaces in the flowing direction of the granular material. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a transfer chute for transferring a granular material obliquely downward.

  Conventionally, as a method for treating municipal solid waste such as municipal waste and combustible waste such as plastic, the ash produced by burning the waste is melted to form molten slag, and this molten slag is cooled with water. A technique for producing solid slag is known.

  As an example of using such a waste treatment method, for example, by putting a waste in a pyrolysis reactor and pyrolyzing it in a low oxygen atmosphere, a pyrolysis residue mainly composed of pyrolysis gas and non-volatile components is obtained. The pyrolysis residue is separated into combustible components and non-combustible components, and the separated combustible components and the previous pyrolysis gas are introduced into a combustion melting furnace for combustion treatment. A method is disclosed in which molten slag generated by melting is introduced into a water tank and cooled with water to form solid slag (granulated slag) (see Patent Document 1). The solid slag thus obtained is recovered by a recovery device, and then effectively used for road pavements, building aggregates, and the like.

Japanese Patent Laying-Open No. 2005-164156 (page 2-4, FIG. 1)

  By the way, in patent document 1, the granular solid slag obtained by water-cooling molten slag is once conveyed on the surface of the water by a conveyor installed in the water tank, for example, and further horizontal to a predetermined recovery site by another conveyor. After being conveyed, the inside of the metal chute is slid downward by its own weight and stored in a storage chamber or the like installed below.

  However, the solid slag transported in this way is rapidly melted in the aquarium because the molten slag in a high temperature state is rapidly cooled. May be. Furthermore, many slags have a higher hardness than metals such as iron. For this reason, when the solid slag is slid in the metal chute, the inclined plate receiving the solid slag is rapidly worn, and there is a risk that holes will be formed. It has been demanded.

  As a measure against such a situation, an attempt to switch a metal inclined plate to ceramics has been studied. However, ceramics are vulnerable to impact, and there is a possibility that it will become expensive if damage or the like occurs. Further, such chute wear is not limited to the transfer of the solid slag, and the same problem may occur when transferring other granular materials.

  An object of the present invention is to suppress wear of an inclined plate of a chute by a granular material and to keep a running cost low in a chute that slides and transfers the granular material obliquely downward.

  In order to solve the above-mentioned problem, the present invention is a chute for moving granular materials obliquely downward due to its own weight, and a weir for blocking the flow of the granular materials is formed on the inclined surface that receives the granular materials in the chute. A plurality of the sensors are provided at a set interval in the flow direction.

  According to the present invention, the granular material supplied into the chute is first dammed up to a predetermined amount by the most upstream weir, and then the granular material overflowing from here flows downstream and dams into another weir. It can be stopped. The granular material blocked by each weir is stacked along the inclined surface above the weir to form a layer. As described above, when the inclined surface is filled with the granular material, the granular material flowing in the chute thereafter slides on the granular material layer. Therefore, since it can avoid that a granular material contacts the inclined surface of a chute | shoot, abrasion of an inclined surface can be suppressed. In addition, according to the present invention, since it is only necessary to provide a weir having a simple structure on the inclined surface, the inclined surface can be formed of metal, and the running cost can be kept low. In addition, what is necessary is just to set the space | interval of adjacent weirs so that the whole area of an inclined surface may be covered with a granular material, when the granular material is dammed up to all the weirs.

  In this case, the particulate matter may be solid slag generated by water-cooling and solidifying the molten slag discharged from the melting furnace. According to the present invention, even if the granular material is such an irregular solid slag, since the granular material layer is easily formed on the inclined surface, wear of the inclined surface can be prevented.

  The granular material is a fluidized medium that is added to a fluidized tank for allowing the thermal decomposition residue generated by thermally decomposing waste to flow by air and fractionating the weight, and the chute is a system that guides the fluidized medium to the fluidized tank. It may be arranged on the road. As the fluidized medium for forming the fluidized bed in this way, fluidized sand is used, and the shape is not limited to a spherical shape, and the hardness is high. Can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, while suppressing abrasion of the inclination board of the chute | shoot by a granular material, a running cost can be restrained low.

  Hereinafter, a first embodiment of a chute to which the present invention is applied will be described. The target chute of this embodiment relates to a recovery chute for transferring solid slag obtained by cooling and solidifying molten slag obliquely downward.

  First, a process for producing molten slag will be briefly described. In the present embodiment, waste pulverized to a predetermined size (for example, 150 mm) is put into a rotary drum type pyrolysis reactor (not shown) and heated in a low oxygen atmosphere (for example, 300 to 600 ° C.). And pyrolyze to produce a pyrolysis residue consisting of pyrolysis gas and mainly non-volatile components. The pyrolysis gas is supplied to the combustion melting furnace 1 through a gas line, and the pyrolysis residue is cooled to a predetermined temperature (for example, 80 ° C.) by a cooling device, and then a pyrolysis residue separation device (not shown). In this way, it is separated into combustible components and non-combustible components. The combustible components including fine incombustibles such as ash thus separated are finely pulverized to a predetermined size (for example, 1 mm), and then supplied to the burner of the combustion melting furnace 1, and the above pyrolysis gas Combusted in a high temperature range of about 1300 ° C. together with combustion air. The ash generated by this combustion becomes molten slag 3 and adheres to the inner wall of the combustion melting furnace 1, flows down along the inner wall, and flows into the water tank 9 from the slag discharge port 5 at the bottom of the furnace through the discharge system path 7. Fall into. The molten slag 3 dropped into the water tank 9 is cooled and solidified by the cooling water 11 to become solid slag. On the other hand, the high-temperature combustion exhaust gas generated in the combustion melting furnace 1 is cooled and removed after passing through the high-temperature air heater 13, and then harmful substances are removed, and then becomes a low-temperature clean exhaust gas from the chimney to the atmosphere. Released.

  FIG. 1 is a view showing an example of means for transferring slag solids including a chute to which the present invention is applied. The transfer means of this embodiment includes a first conveyor 15, a second conveyor 17, a third conveyor 19, and a chute 21. The first conveyor 15 has a horizontal portion 15a that receives solid slag that settles in the water tank 9 and conveys it in a substantially horizontal direction, and an inclined portion 15b that carries solid slag out of the water, and is supported by a plurality of rotating shafts. An endless belt is provided around these. Among the plurality of rotating shafts that support the endless belt, a rotating shaft for driving is included.

  The second conveyor 17 and the third conveyor 19 serve as a transport device for horizontally transporting the solid slag transported from the water to the vicinity of the collection site, and both have a horizontal portion that transports in the horizontal direction as a main part. When the horizontal slag collected in the horizontal portion on the side is horizontally transported to the other end side, a portion for transferring upward is provided in the middle. Other configurations are basically the same as those of the first conveyor 15. In the present embodiment, an example in which two second conveyors 17 and three third conveyors 19 are connected will be described. However, the present invention is not limited to this example, and the number of conveyors connected is appropriately increased according to the distance to the collection site. Can be used.

  The chute 21 is formed by extending a metal cylinder having a rectangular cross section obliquely downward, and has a supply portion 21a and a discharge portion 21b extending in the vertical direction on the supply side at one end and the discharge side at the other end, respectively. And between the supply part 21a and the discharge part 21b, the inclination part 21c which connects these is provided. A supply port 23 for supplying solid slag is provided at the upper end of the supply portion 21a, and a discharge port 25 for discharging solid slag is provided at the lower end of the discharge portion 21b.

  According to the solid slag transfer means configured as described above, first, the solid slag that settles in the water is recovered by the horizontal portion 15a of the first conveyor and conveyed in the horizontal direction, and then the water surface by the inclined portion 15b. It is carried out to a predetermined height position above. The solid slag carried out to the end of the inclined portion 15b falls in the direction of the arrow 28 when the endless belt reverses the direction, and the second conveyor 17 that has received the dropped solid slag is a third conveyor. The solid slag is conveyed in the horizontal direction toward one end side of 19. Subsequently, the third conveyor 19 that has received the solid slag dropped from the end of the second conveyor 17 conveys the solid slag in the horizontal direction toward the supply port 23 of the chute 21. Then, the solid slag that has fallen from the third conveyor 19 to the supply port 23 of the chute 21 slides down in the chute 21 by its own weight, is discharged from the discharge port 25, and is stored in a predetermined storage chamber or the like.

  Here, the configuration of the chute 21 will be described in detail. FIG. 2 is a partial cross-sectional view of the chute of FIG. A plurality of plate-like weirs 27 protrude from the inclined surface 26 that receives the solid slag in the chute 21 at a predetermined interval in the flow direction of the solid slag. The weir 27 is provided so as to pass between the inner walls of the chute 21 along the inclined surface 26 in a direction orthogonal to the flow direction of the inclined surface 26 (the direction of the front and back of the paper surface). It has a planar portion 29 that extends. A reinforcing member is appropriately provided in the gap between the lower surface of the weir 27 and the inclined surface 26.

  Next, the operation when the solid slag flows through the chute 21 provided with the weir 27 will be described with reference to FIG. The solid slag supplied through the supply port 23 falls in the direction of the arrow 30, and most of the solid slag is deposited on the flat portion 31 to form the slag layer 33. Subsequently, when the accumulation amount of the slag layer 33 increases to a predetermined amount, the solid slag flows on the slag layer 33 and flows downward, and most of the solid slag is blocked by the weir 27a. The solid slag whose flow is blocked by the weir 27a is gradually stacked on the upstream side along the inclined surface 26 to form the slag layer 33a. When a predetermined amount of the slag layer 33a is deposited, the solid slag supplied from the upstream side flows on the slag layer 33a and flows down to the downstream side, and most of the solid slag is blocked by the following weir 27b. The solid slag blocked by the weir 27b forms a slag layer 33b. In the same manner, the solid slag flowing on the slag layer 33b and flowing downstream is sequentially blocked by the weirs 27c and 27d, and the slag layer is formed downward.

  When the slag layer is formed on all the weirs 27 in this way, almost the entire inclined surface 26 is covered with the solid slag. Therefore, since the solid slag supplied into the chute 21 is slid on the slag layer 33 that protects the inclined surface 26 as indicated by the arrow 35, wear of the inclined surface 26 can be avoided. it can.

  Here, the interval between the adjacent weirs 27 is set such that almost all of the inclined surface 26 is covered with the solid slag in a state where a predetermined amount of the solid slag is blocked by all the weirs 27. However, since the solid slag does not slide in the region such as the inclined surface 26 directly below the weir 27, wear can be suppressed even if the solid slag layer is not formed in this region. More specifically, for example, when the repose angle of the granular material is 45 degrees (40 degrees to 50 degrees), the interval L (FIG. 2) in the inclination direction of the weir 27 is set to 100 mm (50 mm to 150 mm). It is good.

  The solid slag dropped from the supply port 23 comes into contact with the flat portion 31, but since the slag layer 33 is deposited on the flat portion 31, wear of the flat portion 31 can be suppressed.

  The weir 27 of the present embodiment is formed so as to protrude from the inclined surface 26 in the horizontal direction, but is limited to this structure as long as the solid slag can be deposited along the inclined surface 26. is not. According to this embodiment, since it is only necessary to provide the weir having a simple structure on the inclined surface 26, the inclined surface 26 can be formed of metal, and the equipment cost and running cost can be kept low.

  Next, a second embodiment of the chute to which the present invention is applied will be described. The chute which is the object of the present embodiment relates to a chute for guiding the fluidized medium to a fluidized tank for allowing the pyrolysis residue to flow with air together with the fluidized medium for weight separation.

  FIG. 4 is a configuration diagram illustrating a pyrolysis residue sorting apparatus for sorting the pyrolysis residue described in the first embodiment. The pyrolysis residue separation device is configured to include a fluidized bed 41 and a screw feeder 43, and a chute 48 to which the present invention is applied is connected to the upper part of the fluidized tank 41. The fluidized bed 41 is connected to one end of the screw feeder 43 through a chute 45 having a rectangular cross section formed at the bottom outlet.

  The fluidized bed 41 includes an inclined perforated plate 49 provided obliquely across the inner wall of a box-shaped container 47, and air boxes 51a, 51b, 51c formed by dividing the lower space of the inclined perforated plate 49 into three parts. I have. The container 47 is formed so as to be inclined obliquely toward the upper side of the inclined perforated plate 49 with respect to the vertically formed chute 45, and for taking out a workpiece (for example, pyrolytic carbon) of pyrolysis residue. An outlet 53 is provided at the top, and a supply port 55 for supplying a pyrolysis residue is provided on the upper side surface. A chute 48 for supplying a fluid medium (hereinafter referred to as fluid sand) is connected to a side surface of the container 47 facing the supply port 55, and the fluid sand is slanted downward under its own weight in the chute 48. It is supposed to slide down.

  A space above the inclined perforated plate 49 in the container 47 serves as a storage chamber 61 for storing a workpiece. The wind boxes 13a to 13c are each partitioned by a partition wall 57, and air supply pipes 59a to 59c are connected to the respective wind boxes. A large number of air ejection holes are formed in the inclined perforated plate 49, and air is ejected into the storage chamber 61 through the air ejection holes.

  The screw feeder 43 includes a casing 63 installed in the horizontal direction, a uniaxial screw 65, and a motor 67. The screw 65 is housed in the casing 63 and is formed by attaching blades 71 in a spiral shape on the outer periphery of the screw shaft 69. The screw shaft 69 is connected to the drive shaft of the motor 67. A connection port 73 connected to the chute 45 is provided above one end side of the casing 63, and a discharge port 75 is provided below the other end side.

  Next, the operation of the pyrolysis residue sorting apparatus configured as described above will be described. Pyrolysis residue generated in the pyrolysis reactor is introduced into the fluidized tank 41 through the supply port 55 in a state cooled to a predetermined temperature (for example, 80 ° C.), and fluidized sand is introduced through the chute 48. Is introduced. The pyrolysis residue and fluid sand introduced into the fluid tank 1 are deposited on the inclined perforated plate 49, fluidized by the air ejected from the air ejection holes, and mixed to form a fluidized bed.

  Here, the pyrolysis residue contains incombustible materials such as pyrolytic carbon in addition to incombustible materials such as metal, glass, and ceramics. And the like are separated from the incombustible material, blown upward, and discharged from the outlet 53 to be separated. The combustible material discharged from the outlet 53 is introduced into a combustion melting furnace and burned, for example.

  On the other hand, the relatively heavy pyrolysis residue that has not been blown off rolls on the inclined porous plate 49 and moves downward together with the fluidized sand. Here, the pyrolysis residue and the fluidized sand accumulated in the chute 45 are guided into the screw feeder 43 by the rotation of the screw 65 in the screw feeder 43 and conveyed in the horizontal direction.

  The pyrolysis residue and fluidized sand discharged from the outlet 75 are passed through a sieve and separated into valuable materials such as metal, incombustibles such as rubble, and pyrolytic carbon, and the fluidized sand is conveyed upward by a conveyor or the like. After that, the fluid is returned again into the fluid tank 41 through the chute 48.

  By the way, the fluidized sand used in the present embodiment may be damaged such as chipping or cracking when passing through a pyrolysis residue separation device or passing through a sieve. May be included. Furthermore, since the fluid sand generally has a higher hardness than the metal inclined surface, when the fluid sand slides down in the chute 48, the metal inclined surface that receives the fluid sand is likely to be worn, thereby causing the inclination. It is necessary to replace the surface regularly.

  For this reason, in this embodiment, a plurality of weirs having the same configuration as that of the first embodiment are provided on the inclined surface of the chute 48. By doing so, it is possible to avoid wear of the inclined surface due to the fluidized sand, so that the equipment cost and the running cost can be kept low.

It is a figure which shows an example of the transfer means of the slag solid substance containing the chute | shoot of the 1st Embodiment of this invention. It is a fragmentary sectional view of the chute | shoot of FIG. It is a figure explaining operation | movement when solid slag flows through the inside of the chute | shoot of FIG. It is a block diagram of the thermal decomposition residue fractionation apparatus containing the chute | shoot of the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Combustion melting furnace 3 Molten slag 9 Water tank 11 Cooling water 15 1st conveyor 21 Chute 26 Inclined surface 27 Weir 33 Slag layer 41 Fluidized bed 43 Screw feeder 48 Chute

Claims (3)

A chute that moves the granular material diagonally downward by its own weight,
The inclined surface for receiving the granular material in the chute is provided with a plurality of weirs for blocking the flow of the granular material at a set interval in the flow direction of the granular material. Shoot for.   The said granular material is a solid slag produced | generated by water-cooling solidifying the molten slag discharged | emitted from the melting furnace, The chute | shoot for transfer of the granular material of Claim 1 characterized by the above-mentioned.   The granular material is a fluidized medium that is added to a fluidized tank for allowing a thermal decomposition residue generated by thermally decomposing waste to flow by air to separate the weight, and the chute is configured to add the fluidized medium to the fluidized tank. 2. The granular material transfer chute according to claim 1, wherein the chute is arranged in a guiding path.