JP3562012B2 - Incombustibles discharge device of fluidized bed incinerator - Google Patents

Description

[0001]
[Industrial applications]
TECHNICAL FIELD The present invention relates to an incombustible discharge device for a fluidized bed incinerator for incinerating trash and the like.
[0002]
[Prior art]
Conventionally, as an incombustible discharge device of this type of fluidized bed incinerator, for example, there has been a device described in Japanese Patent Application Laid-Open No. 62-19609, which is shown in FIG. A screw conveyor 4 for transferring a fluid medium 2 such as sand discharged from a floor-type incinerator 1 and incombustibles 3, and the fluid medium 2 and the incombustibles 3 transferred by the screw conveyor 4 are separated and discharged. And a rotating sieve 5.
[0003]
The rotary screen 5 has a substantially cylindrical screen body 6 disposed at the downstream end of the screw conveyor 4 so as to be rotatable substantially concentrically with the rotation axis of the screw conveyor 4. Is formed by punching metal having a large number of holes 7 formed in a cylindrical shape, and is integrally attached to a screw shaft 4 a of the screw conveyor 4.
[0004]
In the conventional apparatus for discharging incombustibles of a fluidized bed incinerator shown in FIG. 5 , the fluid medium 2 and the incombustibles 3 discharged from the fluidized bed incinerator 1 are downstream by rotation of a screw shaft 4a of a screw conveyor 4. The fluid medium 2 having a size capable of passing through the hole 7 of the sieve main body 6 is fed into the sieve body 6 of the rotary sieve 5 rotating integrally with the screw shaft 4a. The non-combustible material 3 having a size that cannot pass through the hole 7 of the sieve body 6 falls to the chute 9 from the open end on the downstream side of the sieve body 6 so that the fluid medium 2 and the non-combustible material 3 are separated. It has become.
[0005]
The fluidized medium 2 that has fallen into the chute 8 is supplied to the fluidized bed incinerator 1 again, if necessary, based on the fluidized bed level control required to maintain fluidization of the fluidized bed. While being guided to the incinerator 1 and reused, the incombustibles 3 that have fallen into the chute 9 are collected by a bunker or the like.
[0006]
[Problems to be solved by the invention]
However, in the conventional incombustible discharge apparatus for a fluidized bed incinerator as described above, a punching metal having a large number of holes 7 is used as the sieve body 6 of the rotary sieve 5, and the fluid medium 2 and the incombustible If the diameter of the hole 7 is reduced in order to enhance the separation performance of the hole 3, the hole 7 is likely to be clogged immediately and the fluid medium 2 and the incombustible material 3 cannot be separated easily. It is necessary to set the diameter of the fluid medium 2 to about 30 mm, and a part of the non-combustible material 3 often falls from the hole 7 to the chute 8 together with the fluid medium 2. A vibrating sieve or the like for further separating the incombustibles 3 needs to be separately provided on the downstream side of the incombustibles discharge device, which has a drawback of increasing equipment costs.
[0007]
In the case of the conventional incombustible discharger for a fluidized bed incinerator, the sieve body 6 of the rotary sieve 5 rotates integrally with the screw shaft 4a at the same rotational speed. It is not possible to select the optimum rotation speed of the sieve body 6 for separating the fluid medium 2 from the incombustibles 3 because it depends on the operation on the side, so that the fluid medium 2 is separated from the incombustibles 3. Therefore, the length of the sieve body 6 has to be increased, which leads to an increase in the size of the apparatus.
[0008]
In view of such circumstances, the present invention can reliably perform separation of a fluid medium and incombustibles without causing clogging, does not require the provision of a vibrating sieve or the like on the downstream side, and can reduce equipment costs. Another object of the present invention is to provide a non-combustible discharge device for a fluidized bed incinerator that can be reduced in size.
[0009]
[Means for Solving the Problems]
The present invention is a screw conveyor for transferring a fluid medium and incombustibles discharged from a fluidized bed incinerator,
At the downstream end of the screw conveyor, there is a substantially cylindrical sieve body disposed so as to be rotatable substantially concentrically with the rotation axis of the screw conveyor, and the fluid medium and incombustibles transferred by the screw conveyor And a rotary sieve that separates and discharges by rotation of the sieve body, and a non-combustible discharge device for a fluidized bed incinerator comprising:
A sieve body having a configuration in which a large number of flat bars extending in the transport direction of the fluid medium and the incombustibles are arranged at required intervals in the circumferential direction, and a required number of flat bars forming the sieve body of the rotary sieve are collected. Thereby, a plurality of flat bar units equally divided for each required angle range in the circumferential direction were formed, the inclination angle was adjustable for each flat bar unit, and the spread angle of the sieve body was configured to be adjustable . The present invention relates to an incombustible discharge device for a fluidized bed incinerator.
[0010]
[0011]
Wherein the incombustible discharging device of the fluidized bed incinerator, the spacing of the flat bars forming a screen body of the rotating sieve, spread gradually toward the downstream side from the transfer direction upstream side of the fluidized medium and incombustibles, sieve rotating sieve it is possible to form the body into a hollow truncated cone.
[0012]
[0013]
Further, it is desirable that the sieve body of the rotary sieve be configured to be rotationally driven by a driving device different from the screw conveyor.
[0014]
[Action]
Therefore, the fluidized medium and the incombustibles discharged from the fluidized bed incinerator are transferred to the downstream side by the rotation of the screw shaft of the screw conveyor, fed into the rotating rotating sieve body, and the sieve body is rotated. Fluid medium of a size that can pass through the gap of the flat bar to be formed falls from the gap, and incombustible materials of a size that cannot pass through the gap of the flat bar of the sieve body fall from the downstream open end of the sieve body. The separation of the fluid medium and the incombustible material is performed. Here, the sieve body of the rotary sieve is provided with a number of flat bars extending in the transport direction of the fluid medium and the incombustible material at a required interval in the circumferential direction. It is possible to set the gap of the flat bar to be almost equal to the maximum particle size of the flowing medium because it is less likely to cause clogging than punching metal with a large number of holes. Unless is a very small incombustible, it will hardly fall from the gap of the flat bar together with the fluid medium, and the fluid medium and the incombustible material are surely separated. As a result, the fluid medium and the incombustible material are separated. Further, it is not necessary to separately provide a vibrating sieve or the like for separation on the downstream side of the incombustible discharge device.
[0015]
Moreover, by flattening the required number of flat bars that form the sieve body of the rotary sieve, a plurality of flat bar units are equally divided for each required angle range in the circumferential direction, and the inclination angle is set for each flat bar unit. It is adjustable and the spread angle of the sieve body is configured to be adjustable, so that the spread angle of the sieve body is adjusted in advance according to the type and size of main incombustibles discharged from the fluidized bed incinerator. If the adjustment is performed, the separation of the fluid medium and the incombustibles is performed reliably and in a short time.
[0016]
Also, if the interval between the flat bars forming the sieve body of the rotary sieve is gradually increased from the upstream side to the downstream side in the direction of transport of the fluid medium and the incombustibles, and the sieve body of the rotary sieve is formed into a hollow truncated cone, Further, clogging is less likely to occur, and the fluid medium and the incombustibles are reliably separated.
[0017]
[0018]
Furthermore , when the sieve body of the rotary sieve is configured to be rotationally driven by a driving device different from the screw conveyor, the sieve body of the sieve body is adjusted according to the amount of the fluidized medium and the incombustibles discharged from the fluidized bed incinerator. When the rotation speed is appropriately adjusted, the fluid medium can be efficiently separated from incombustible materials and dropped from the gap of the flat bar to the chute, so that the sieve body does not need to be lengthened.
[0019]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0020]
[0021]
[0022]
[0023]
[0024]
[0025]
[0026]
[0027]
[0028]
[0029]
[0030]
[0031]
[0032]
[0033]
[0034]
FIGS. 1 to 4 show an embodiment of the present invention. In the drawings, the parts denoted by the same reference numerals as those in FIG. 5 represent the same parts, and a plurality of parts extending in the transfer direction of the fluid medium 2 and the incombustibles 3 Are arranged at predetermined intervals (approximately 3 to 4 mm) in the circumferential direction to form the sieve body 6 of the rotary sieve 5 and the flat bar 10 forming the sieve body 6 of the rotary sieve 5. The interval between the bars 10 is gradually widened from the upstream side to the downstream side in the transport direction of the fluid medium 2 and the incombustibles 3 to form the sieve body 6 of the rotary sieve 5 into a hollow truncated cone, and the flat bar 10 is required. A plurality of flat bar units 37 are equally divided for each required angle range in the circumferential direction (approximately 30 ° in the example in the figure) by grouping by number, and the inclination angle can be adjusted for each flat bar unit 37. Adjust the spread angle of the sieve body 6 It is obtained by constituting the standing.
[0035]
As shown in FIG. 2 , the sieve body 6 of the rotary sieve 5 is provided with a flange portion 38a projecting toward the inner peripheral side of the upstream cylindrical body 38 and a downstream cylindrical body 39 at a required pitch in the circumferential direction. Between the flange portion 38a protruding toward the inner peripheral side of the upstream cylindrical body 38 and the flange portion 39a protruding toward the outer peripheral side of the downstream cylindrical body 39. It has a configuration in which the plurality of flat bar units 37 are disposed so as to span them.
[0036]
As shown in FIGS. 2 and 4 , the flat bar unit 37 has a plurality of flat bars formed in a fan-shaped opening 41 formed in a fixing plate 40 which is mounted on the fixing plate 40 so as to be adjustable in a radial direction with respect to the flange portion 38a. The upstream ends of the bars 10 are fitted, and the downstream ends of the plurality of flat bars 10 are fitted into fan-shaped openings 43 formed in a fixing plate 42 attached to the flange portion 39a. The tilt angle of each flat bar unit 37 is adjusted by appropriately adjusting the radial position of the fixing plate 40 with respect to the flange portion 38a by tightening the bolt 47 to the long hole 46 of the flange portion 38a. It can be adjusted. As shown in FIG. 4 , spacers 44 for holding gaps between the flat bars 10 are interposed between the upstream ends of the plurality of flat bars 10 fitted into the openings 41 of the fixing plate 40 . And a connecting rod 45 penetrating through each of the spacers 44 and each of the flat bars 10, and the upstream ends of the plurality of flat bars 10 maintain a desired gap by the connecting rods 45 and the spacers 44. Although not shown, the downstream ends of the plurality of flat bars 10 fitted into the openings 43 of the fixed plate 42 are also upstream by the connecting rods and the spacers as described above. It is connected while maintaining a desired gap slightly wider than the side.
[0037]
Further, the sieve body 6 of the rotary sieve 5 rotates so that the lower edge of the downstream cylindrical body 39 and the lower edge of the upstream cylindrical body 38 are placed on the cam followers 12 'and 13', respectively. It is freely supported and is driven to rotate by a driving device 11 different from the screw conveyor 4. As shown in FIG. 1, a rotary drive shaft 35 rotatably supported so as to penetrate a casing 5a covering the rotary sieve 5 is connected to the drive device 11 via a coupling 31, and A chain 33 is fixed on the outer peripheral surface on the upstream side of the sieve main body 6 over the entire circumference, and a sprocket 34 meshing with the chain 33 is provided on the rotary drive shaft 35, whereby the drive device 11 When the rotary drive shaft 35 is rotationally driven via the coupling 31 by the operation of the sprocket 34, the sprocket 34 rotates, and the sieve body 6 can rotate at a desired rotational speed. The wall of the casing 4b of the screw conveyor 4 and the screw shaft 4a are each formed in a hollow shape, and hot water is recovered by passing cooling water through the inside.
[0038]
In the embodiment shown in FIGS. 1 to 4 , the fluidized medium 2 and the incombustibles 3 discharged from the fluidized bed incinerator 1 are transferred to the downstream side by the rotation of the screw shaft 4 a of the screw conveyor 4, and the driving device 11 Is fed into the sieve body 6 of the rotating sieve 5 rotating at a desired rotation speed via the coupling 31, the rotary drive shaft 35, the sprocket 34, and the chain 33 to form the flat body forming the sieve body 6. The fluid medium 2 large enough to pass through the gap of the bar 10 falls to the chute 8 from the gap, and the incombustible material 3 large enough not to pass through the gap of the flat bar 10 of the sieve body 6 is located downstream of the sieve body 6. From the open end to the chute 9 to separate the fluid medium 2 and the incombustibles 3.
[0039]
Here, the sieve body 6 of the rotary sieve 5 is formed by arranging a large number of flat bars 10 extending in the transfer direction of the fluid medium 2 and the incombustibles 3 at a required interval in the circumferential direction. In addition, since the interval between the flat bars 10 is gradually increased from the upstream side to the downstream side in the transport direction of the fluid medium 2 and the incombustible material 3, the sieve body 6 of the rotary sieve 5 is formed in a hollow truncated cone shape. The clogging of the flat bar 10 is less likely to occur than the punched metal in which the holes are formed, and the gap of the flat bar 10 is the maximum size of the fluid medium 2 (in the case of sand, the particle size is about φ0.2 to 3.5 [mm]). The particle size can be set to be substantially equal to the particle size. Unless the size of the non-combustible material 3 is extremely small, the particle is hardly dropped from the gap of the flat bar 10 to the chute 8 together with the fluid medium 2. And noncombustible 3 Reliably performed, as a result, it is not necessary separately provided vibrating screen or the like for further separating the bed material 2 and the incombustible material 3 that has fallen into the chute 8 on the downstream side of the incombustible discharging device.
[0040]
Further, by appropriately adjusting the position of the fixing plate 40 in the radial direction with respect to the flange portion 38a by tightening the bolt 47 to the long hole 46 of the flange portion 38a, the inclination angle of each flat bar unit 37 is adjusted, and Since the spread angle is adjusted, if the spread angle of the sieve body 6 is adjusted in advance according to the type and size of the main incombustible material 3 discharged from the fluidized bed incinerator 1, the fluid medium 2 and the non-combustible material 3 are reliably and quickly performed. Moreover, the flat bar unit 37 can be easily replaced by removing the fixing plates 40 and 42 from the flange portions 38a and 39a, which is advantageous in terms of maintenance.
[0041]
Furthermore, the sieve body 6 of the rotary sieve 5, to be rotated by a separate drive unit 11 and the screw conveyor 4, the amount of fluidized medium 2 and incombustible 3 discharged from the fluidized bed incinerator 1 If the rotation speed of the sieve body 6 is appropriately adjusted according to the conditions, the fluid medium 2 can be efficiently separated from the non-combustible material 3 and dropped from the gap of the flat bar 10 to the chute 8. In the case where an empty can is mixed as the incombustible material 3 discharged from the fluidized-bed incinerator 1, the fluid medium 2 enters the empty can. However, when the empty can containing the fluidized medium 2 therein is introduced into the rotating sieve body 6, the empty can inverting flat bar 10 'causes the empty can to return to a certain height position in the sieve body 6. To the inside of the sieve body 6 Is repeated several times, during this time, the fluid medium 2 that has entered the empty can is taken out of the empty can and falls from the gap of the flat bar 10 of the sieve body 6 to the chute 8, and the empty can is 6 falls to the chute 9 from the open end on the downstream side.
[0042]
Achieved in this way, it is possible to reliably perform the separation of the fluidized medium 2 and incombustible 3 without causing clogging, it is not necessary to provide a vibrating screen or the like on the downstream side, resulting to reduce equipment costs, and also miniaturization It becomes possible.
[0043]
In addition, the incombustibles discharge device of the fluidized bed incinerator of the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the gist of the present invention. .
[0044]
【The invention's effect】
As described above, according to the incombustible discharge apparatus of the fluidized bed incinerator according to the first aspect of the present invention, according to the type and size of the main incombustible discharged from the fluidized bed incinerator, etc. In advance, the spread angle of the sieve body can be adjusted , separation of the fluid medium and incombustible material can be performed reliably and in a short time without clogging, and there is no need to provide a vibrating sieve or the like on the downstream side. An excellent effect that the equipment cost can be reduced can be obtained.
[0045]
[0046]
Further, according to the incombustible discharge apparatus of the fluidized bed incinerator according to the second aspect of the present invention, clogging can be further suppressed, and the incombustible material can be separated from the fluid medium more reliably. .
[0047]
[0048]
Furthermore , according to the incombustible discharge device for a fluidized bed incinerator according to claim 3 of the present invention, the rotation of the sieve main body is performed in accordance with the amount of the fluid medium and the incombustible discharged from the fluidized bed incinerator. The speed can be adjusted appropriately, the fluid medium can be efficiently separated from incombustibles and dropped from the gap of the flat bar to the chute, the length of the sieve body can be shortened, and downsizing can be achieved. Becomes possible.
[Brief description of the drawings]
FIG. 1 is a side sectional view of one embodiment of the present invention.
FIG. 2 is an enlarged side sectional view of a sieve main body in the embodiment of the present invention shown in FIG.
FIG. 3 is a view taken in the direction of arrows III-III in FIG . 2 ;
FIG. 4 is a sectional view taken along line IV-IV of FIG . 2 ;
FIG. 5 is a side sectional view of a conventional example .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fluid bed incinerator 2 Fluid medium 3 Noncombustible material 4 Screw conveyor 5 Rotating sieve 6 Sieve body 10 Flat bar 11 Drive 37 Flat bar unit

Claims (3)

A screw conveyor for transferring the fluidized medium and incombustibles discharged from the fluidized bed incinerator,
A downstream end portion of the screw conveyor has a substantially cylindrical sieve body disposed so as to be rotatable substantially concentrically with the rotation axis of the screw conveyor, and the fluid medium and incombustibles transferred by the screw conveyor And a rotary sieve that separates and discharges by rotation of the sieve body, wherein
A sieve body having a configuration in which a large number of flat bars extending in the direction of transport of the fluid medium and the incombustibles are arranged at required intervals in the circumferential direction, and a required number of flat bars forming the sieve body of the rotary sieve are collected. Thereby, a plurality of flat bar units equally divided for each required angle range in the circumferential direction were formed, the inclination angle was adjustable for each flat bar unit, and the spread angle of the sieve body was configured to be adjustable . An incombustible discharge device for a fluidized bed incinerator, characterized in that: 2. The rotating sieve body according to claim 1, wherein the interval between the flat bars forming the main body of the rotary sieve is gradually increased from the upstream side to the downstream side in the direction of transport of the fluid medium and the incombustible material, and the main body of the rotary sieve is formed in a hollow truncated cone shape. Of incombustibles in fluidized bed incinerators. 3. The device for discharging incombustibles of a fluidized bed incinerator according to claim 1, wherein the sieve body of the rotary sieve is configured to be rotationally driven by a driving device different from the screw conveyor.

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