JP2005089056A - Refuse feeder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refuse feeder for equally distributing and supplying city waste and other waste to treating equipment such as a fluidized gasification furnace, a fluidized incinerator or fluidized thermal decomposition furnace. <P>SOLUTION: This feeder is provided with a refuse supply hopper 12 arranged on a front stage of a gasification furnace 10 such as the fluidized gasification furnace, the fluidized incinerator or the fluidized thermal decomposition furnace, a refuse supply cylinder 16 provided in a lower part of the refuse supply hopper 12, an air-cooled jacket 17 formed on a feeding side of the refuse supply cylinder 16 and a screw conveyor driving mechanism 35, as principal parts. The feeder equally distributes and supplies refuse to be incinerated to the gasification furnace 10 by a screw type conveyor jointly provided with two shafts provided in the refuse supply cylinder 16. A partition plate 23 is erected between screws 20 of two parallel shafts within the refuse supply cylinder 16. The screws 20 of the two shafts are made to have a mutually alienating rotation by reversing the rotation to each other. By mutually shifting screw blades 21 by a 180°phase, refuse is fed from distal end parts 21a of the screw blades 21 rotating in the phase shifted states. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention provides a dust supply for uniformly distributing and supplying municipal waste and other wastes to the supply ports of treatment facilities such as a fluidized gasification furnace, a fluidized incinerator or a fluidized pyrolysis furnace for incineration or thermal decomposition. It relates to (dust) equipment.

  Municipal waste and other waste (hereinafter abbreviated as waste or waste) have been increasing year by year, but municipal waste has been treated in a low-oxygen atmosphere along with fluid pyrolysis furnace and fluid incinerator. Thus, a gasification melting method using a fluidized gas furnace for thermally decomposing the processed material and a melting furnace for combusting a thermally decomposed gas generated in the fluidized gasification furnace at a high temperature is being adopted. In fluidized gasification furnaces, fluidized pyrolysis furnaces and fluidized incinerators (hereinafter simply referred to as “gasification furnaces”), the waste that has been thrown into the waste pits is thrown into the waste hopper by crane up and crushed. It is supplied into the gasification furnace by a screw type supply device arranged in the lower part. When supplying to the gasification furnace, a material seal is formed with respect to the pressure in the furnace, the amount of refuse supplied to the furnace is stable, and evenly distributed into the furnace It is necessary.

When supplying garbage to the gasification furnace using a single screw feeder, the material to be melted remains at the supply port and is easily fixed by being exposed to the high temperature in the furnace. For this reason, a cooling cylinder is provided at the tip of the screw feeder as a countermeasure against melting and sticking.However, since the sticking of the object to be melted cannot be prevented completely, the feeder is moved back and forth together with the gantry to break the stuck object to be melted. However, stable supply is not possible due to the single screw feeder. (For example, patent document 1). For this reason, if parallel twin-screws are used, dust or the like is easily compacted between the screws and a bridge is easily generated. Therefore, the two screws are rotated inwardly and inwardly, and a wedge-shaped wedge-shaped section is formed at the center of the screw shaft. A guide plate with connected projections is formed, and a stirring shaft having a plurality of projections is mounted near the top of the wedge-shaped projections of this guide plate. By rotating the stirring shaft forward and backward repeatedly, dust that remains on the upper edge of the screw is moved to the left and right. Distribution is prevented to prevent generation of bridges (for example, Patent Document 2).
JP 2000-304226 A (page 4, left column 45th line to right column 4th line, FIG. 1) JP 2003-48628 A (page 4, left column, lines 31-38, right column, lines 19-36, FIG. 1 (c))

Garbage in the pit is supplied to the storage hopper by the crane, then falls downward by the garbage supply pusher, dropped into the supply screw conveyor through the garbage crusher, switching conveyor and sealing rotary valve, and the screw conveyor rotates. However, the dust crushed by the crusher falls, accumulates on the screw conveyor, arches, and cannot be sent out uniformly, so various attachments are attached before and after the screw conveyor. Although there was an improvement, there was a problem that the structure was complicated.
Moreover, if the biaxial screw conveyor is rotated inward and pushed in as in Patent Document 2, the dust is consolidated and does not burn. That is, since the biaxial screw conveyor is rotated inward and inward and conveyed in a compacted state, it becomes a dumpling and the flow rate greatly fluctuates. In this case, the dust on the left and right side of the supply hopper under the waste hopper is alternately tightened and loosened to prevent the occurrence of bridging of dust in the lower part of the hopper, and it is fed into the supply screw shaft. Although it is possible to stabilize the conveyance to some extent, the structure is complicated and the number of parts increases.

  In the present invention, a parallel two-axis screw conveyor is provided in the supply cylinder below the waste supply hopper, the two-axis screw is rotated outside and outside, and the parallel two-axis screw blades are set to be 180 degrees out of phase. Distributes and feeds garbage from the tip of the rotating left and right blades and distributes the partition plate between the two screw screws to a height about the screw axis at the lower opening of the supply hopper. Then, it aims at providing the dust supply (dust) apparatus which supplied the conveyed product (garbage) in the furnace by fixed flow volume without raise | generating arching by having set it as screw tooth surface height.

  In order to achieve the above object, claim 1 of the present invention is provided with a waste supply cylinder provided with a parallel twin-screw screw conveyor at a lower portion of a waste supply hopper to a fluidized gasification furnace, a fluidized incinerator or a fluidized pyrolysis furnace. In a dust feeder that distributes and distributes incinerated waste evenly; a partition plate is erected between parallel twin-screws in the waste supply cylinder, and the rotation of the parallel twin-screws is reversed. In addition to external and external rotation, the parallel biaxial screw blades are set to be 180 ° out of phase with respect to the rotating surface; the dust in the waste supply cylinder is rotated out of phase by the synchronous rotation of the screw. It is characterized by being fed from the tip of the left and right screw blades and distributedly supplied into the gasification furnace. According to a second aspect of the present invention, the partition plate has a height about the screw shaft center in the dust supply hopper lower opening portion, and adjacent screw blades in the dust supply cylinder extending from the dust supply hopper lower opening edge to the screw shaft tip portion. A V-shaped support is welded between the upper and lower edges of the partition plate and the inner wall of the dust supply cylinder so as to narrow the gap between the rotating outer edges.

  In the present invention, a parallel two-axis screw conveyor is provided in the supply cylinder below the waste supply hopper, and the two-axis screw is rotated outside and outside, and the parallel two-axis screw blades are set to be 180 ° out of phase. Since the waste is sent out from the tip portions of the two left and right screw blades that are swung in a state shifted in phase by the rotation of the screw, it can be distributed and supplied into the gasification furnace. In addition, the partition plate set up between the two screw screws is about the height of the screw shaft center in the lower opening portion of the supply hopper, and the screw tooth surface height in the supply cylinder from the lower opening edge of the supply hopper to the screw tip. The effect that the conveyed product (garbage) can be supplied into the furnace at a constant flow rate without causing arching is exhibited.

FIG. 1 is a partially broken side view of the dust feeder of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a side view as seen in the direction of the arrow from the AA line of FIG.
The dust supply device 11 includes a waste supply hopper 12 disposed in the front stage of a gasification furnace 10 such as a fluidized gasifier, a fluidized incinerator, or a fluidized pyrolysis furnace, and a dust supply cylinder provided under the dust supply hopper 12. 16, an air cooling jacket 17 formed on the delivery side of the waste supply cylinder 16, and a screw conveyor drive mechanism 35, which are main parts, and are incinerated by a screw-type screw conveyor provided in the waste supply cylinder 16. Garbage is distributed and supplied to the gasifier 10 evenly. A partition plate 23 is erected between the parallel biaxial screws 20 and 20 in the garbage supply cylinder 16, while the biaxial screws 20 and 20 are rotated in the opposite directions to rotate outside and outside (FIG. 4). In addition, the screw blades 21 and 21 are 180 ° out of phase with each other, and dust is sent out from the screw blade tip portions 21a and 21a (FIGS. 6a and 6b) that rotate in a phase-shifted state.
The garbage supply cylinder 16 is composed of a hopper 16a that accommodates the upstream part of the screw 20 and a supply cylinder main body 16b that accommodates the downstream part of the screw 20, and will be described later. The upper edge of the hopper portion 16a is configured to be able to contact and separate under the opening of the dust supply hopper 12 when it is advanced and retracted.

  Inspection ports 14 and 14 are provided on the side wall of the dust supply hopper 12, and a biting prevention portion 15 that is inclined downstream of the hopper bottom is formed. Level meters N-1, N-2, and N-3 are attached at three locations in the vertical direction to check the feed amount to the screw conveyor. A movable chute 13 is attached to the upper edge of the garbage supply hopper 12, and the inclination angle of the movable chute 13 can be adjusted by the expansion and contraction of the adjusting bar 13a. The partition plate 23 provided between the parallel biaxial screws has a height about the axis of the screw at the lower opening 19 of the dust supply hopper 12 and is located downstream from that, that is, from the dust supply hopper lower opening edge. The dust supply cylinder over the tip of the screw shaft has a height that reaches the upper limit of the screw tooth surface (blade) (FIGS. 1 and 7), and the upper and lower edges of the partition plate 23 in the dust supply cylinder and the dust Between the inner wall of the supply cylinder, a V-shaped support 24 having a ridge side abutted against the upper and lower edges of the partition plate 23 is welded (FIGS. 8 and 9). For this reason, the external rotation of the screws 20, 20 and the partition plate 23 prevent dust bridging in the supply cylinder, and the V-shaped support 24 prevents the space from expanding and improves sealing performance and quantitativeness. To do.

  During maintenance of the dust feeder and the fluidized gasification furnace 10, it is necessary to separate the dust supply cylinder hopper 16 and the air cooling jacket 17 from the fluidized gasification furnace 10. Therefore, the carriage 47 can be moved and retracted along the rail 53 of the base 50 disposed on the front floor surface of the gasifier 10a. A carriage 47 on which the garbage supply cylinder hopper 16 and the screw spindle driving mechanism 35 are mounted is disposed in front of the garbage inlet 10 a opened in the side wall of the fluidized gasification furnace 10. The carriage 47 is guided by a rail 53 on the base 50 fixed to the floor surface, and can be moved forward and backward by hand. Further, a stand 54 is provided at the left end of the base 50, and as shown by a chain line in FIG. 1, when the carriage moves backward, the extra water-cooling flexible tube 26 is hooked to absorb the moving distance. 1 and 2, reference numeral 25 denotes an inspection lid, 48 denotes a furnace wall side plate, 49 denotes a connecting cylinder, and 51 denotes a carriage.

  As shown in FIGS. 1 and 2, the screw conveyor drive mechanism 35 on the carriage 51 includes bearings 36 and 36 that support the screw spindles 18 and 18 and transmission gears 37 and 37 provided between the screw spindles 18 and 18. And a motor 40, a speed reducer 41, an output shaft of the speed reducer 41, sprockets 38, 39 provided at one screw main shaft end, and a chain 42 spanned between the sprockets 38, 39, By driving the motor 40, the parallel screw main shafts 18, 18 are rotated in the opposite directions.

  4 is an enlarged plan view of the screw, FIG. 5 is an enlarged sectional view thereof, and FIG. 6 is a right side view of FIG. The two screws 20, 20 have spiral blades 21, 21 on the outer surface of a hollow tubular screw body, one blade is in the right-handed screw direction, the other blade is in the left-handed screw direction, and each other The phase is shifted by 180 °. Further, a water cooling pipe 30 as a liquid cooling means is inserted into the hollow tubular screw main body, and the front end of the main body is closed by an end plate 20a. The two screws 20, 20 are rotated externally and externally by the gears 37, 37 of the drive mechanism 35, and the screw blade tips have a phase shift of 180 ° from each other, reducing the load. Then, it falls from the left and right blade tip portions 21a, 21a that rotate, and is distributedly supplied into the gasification furnace.

  A liquid cooling means is incorporated in the screw main shaft 18. That is, as shown in FIGS. 1, 2, 4, and 5, the water-cooled tube 30 is loosely passed through the insertion hole 18 a formed in the center of the screw main shaft 18. A rotary joint 31 is provided at the root of the screw main shaft 18, and a flexible tube 26 is connected to the rotary joint 31 so as to be connected to a cold water source (not shown), and a large number of sprays are applied to the water cooling tube 30 extending from the screw main shaft end to the inner center of the screw main body. A hole is provided to cool the main shaft 18 and the screw blade 21. The cooling water after cooling the main shaft 18 and the screw blades 21 passes through a gap between the water cooling pipe 30 and the inner wall of the insertion hole 18a and is drained from cooling water outlets 32 and 33 provided on the side wall of the rotary joint 31. This waste water is used as warm water. Reference numeral 34 denotes a seal box (FIGS. 1 and 4) provided at a position where the screw main shaft 18 passes through the wall of the hopper portion 16a.

7 is a longitudinal sectional view of a jacket as air cooling means, FIG. 8 is a sectional view taken along line BB in FIG. 7, and FIG. 9 is a sectional view taken along line CC in FIG.
An air cooling jacket 17 is formed around the front end of the supply cylinder main body 16b that abuts against the charging port 10a (FIG. 1) of the gasification furnace 10 to prevent the incinerated melt from adhering in the vicinity of the gasification furnace 10 charging port. It has a structure that protects it so that it can be inserted smoothly.
An air inlet 27 and an air outlet 28 are provided on the upper, lower, left and right outer walls of the air cooling jacket 17, and a flange 44.45 is provided at the end face and the center of the air cooling jacket 17.
The flange 44 of the end face is overlapped with the flange 46 of the supply cylinder main body 16b via a sheet packing and bolted. In the center, the flange 45 is clamped by using the overlapping gas guard clamp 47 (for example, garter clamp = made by Nippon Driveit) with the flange 46 formed at the tip of the connecting tube 42 provided on the furnace wall side plate 41. . At the time of maintenance of the gasification furnace 10, the garbage supply cylinder hopper 16 and the air cooling jacket 17 are separated from the fluidization gasification furnace 10 by releasing the clamp of the guard clamp 47 and moving the carriage 51.

The effects of the embodiment are as follows.
(1) The load is reduced and the quantitative property is maintained by the bridge prevention hopper, and foreign matter is prevented from entering by the movable chute and the lower small chute. (2) The load is reduced by the external and external rotation of the two installed screws, and a pair of screw blade ends are dust-supplied by a 180 ° phase shift and distributed to improve quantitativeness. (3) Preventing adhesion and solidification of dust by a partition plate between the screws. The partition plate has V-shaped support at the top and bottom to prevent the space from expanding. (4) The hot waste water from the water cooling system in the screw main shaft (liquid cooling water introduction shaft) can be recycled after the remaining heat is used.

FIG. 10 shows the freeboard pressure in the gasification furnace, where (a) is a characteristic diagram of the freeboard pressure according to the present invention, and (b) is a conventional pressure characteristic diagram of the same.
The free board pressure in the gasification furnace by the conventional type (screw is internal / internal rotation) is +10 to −40 mmAq with respect to the set value of −30 mmAq, and the fluctuation range is large and unstable. The fluctuation is large at 7.2A. On the other hand, in the present invention in which the screw is externally and externally rotated, the freeboard pressure in the gasifier is -20 to -35 mmAq, which is smaller than the set value of -30 mmAq, and the current value of the dust feeder is 6 It is stabilized at .5A to 6.6A. Prevention of adhesion and solidification, load reduction and quantitativeness are ensured.

  As described above, the present invention provides a two-shaft conveyor with external and external rotation screws in the garbage supply cylinder to prevent adhesion and solidification in the garbage supply cylinder, reduce the load, and between the screws. A partition plate is provided to prevent the space from expanding. Further, since the pair of screw blades are 180 ° out of phase, dust is dispersedly supplied from the screw end to improve the quantitativeness. Further, the remaining heat can be utilized by water cooling in the screw main shaft and air cooling by an air cooling jacket provided in the downstream portion of the dust supply cylinder connected to the dust inlet of the gasifier.

It is the side view which fractured and showed a part of this invention dust feeder. It is a top view of FIG. It is the side view seen in the arrow direction from the AA line of FIG. It is an enlarged plan view of a screw. It is an expanded sectional view of a screw. FIG. 5 is a right side view of FIG. 4. It is a longitudinal cross-sectional view of an air cooling jacket. It is sectional drawing in the BB line of FIG. It is sectional drawing in the CC line of FIG. The free board pressure in a gasification furnace is shown, (a) is a characteristic diagram of the free board pressure by this invention, (b) is the same type pressure characteristic diagram of a conventional type.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Fluidization furnace 10a Garbage inlet 11 Dust supply device 12 Garbage supply hopper 13 Movable chute 13a Adjustment screw 14 Inspection port 15 Biting prevention part 16 Garbage supply cylinder 16a Hopper part 16b Supply cylinder main body part 17 Air-cooling jacket 18 Screw spindle 18a Insertion hole 19 Lower hopper opening 20 Screw 20a Hollow screw body 20b End plate 21 Screw blade 22 End plate 21a Blade tip 23 Partition plate 23a Notch 24 Support 25 Inspection lid 26 Flexible tube 27, 28 Air inlet / outlet 29 Sheet packing 30 Water-cooled pipe 31 Rotary joint 32, 33 Water inlet / outlet 34 Seal box 35 Screw conveyor drive mechanism 36 Bearing 37 Gear 38, 39 Sprocket 40 Motor 41 Reducer 42 Chain 43, 44, 45 Franc G 47 Girder clamp 48 Furnace wall side plate 49 Connection cylinder 50 Base 51 Dolly 52 Wheel 53 Rail

Claims (2)

Dust supply with a garbage supply cylinder equipped with a parallel twin-screw screw conveyor at the lower part of the garbage supply hopper to the fluidized gasification furnace, fluidized incinerator or fluidized pyrolysis furnace so that the incinerated garbage can be distributed and supplied evenly In the device
A partition plate is erected between the parallel two-axis screws in the dust supply cylinder, and the parallel two-axis screws rotate in opposite directions to rotate outside and outside, and the parallel two-axis screw blades are related to the rotation surface. Set to 180 ° out of phase with each other,
A dust supply device characterized in that dusts in a dust supply cylinder are sent out from the tip of left and right screw blades rotating in a phase-shifted state by a synchronous rotation of a screw and distributedly supplied into a gasification furnace.   The partition plate has a height approximately equal to the screw shaft center in the dust supply hopper lower opening portion, and a gap between the rotation outer edges of adjacent screw blades in the dust supply cylinder from the dust supply hopper lower opening edge to the screw shaft tip portion. The dust feeder according to claim 1, wherein a V-shaped support is welded between the upper and lower edges of the partition plate and the inner wall of the dust supply cylinder so as to narrow the gap.

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