JP3895980B2 - Pyrolysis treatment equipment for organic sludge - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a thermal decomposition treatment apparatus for organic sludge that generates compost by heating and stirring organic sludge.
[0002]
[Prior art]
In general, organic sludge, which is a residue obtained by treating sewage, human waste, food processing wastewater, or the like, is treated by incineration, fermentation, carbonization, or the like.
[0003]
In the incineration process, organic sludge is usually incinerated with combustible waste, but it is regarded as a problem that dioxins are generated due to incomplete combustion of organic sludge having a high water content.
[0004]
Fermentation treatment is a method in which microorganisms are decomposed over a long period of time of about 20 days by mechanical treatment and about 180 days by sedimentation method in order to ferment and decompose and mature organic sludge. Even if this processed product is aged, the content of active ingredients varies widely, so that the active ingredients cannot be guaranteed and can only be handled as a special fertilizer with little added value.
[0005]
Therefore, recently, a carbonization method has been proposed in which the content of the active ingredient is stabilized by thermal decomposition at a low temperature. For example, Japanese Patent Laid-Open No. 2000-157949 describes a method in which crushed garbage is heated to 100 ° C. or higher and 250 ° C. or lower while stirring in a stirring tank equipped with a heating medium jacket, and subjected to low-temperature carbonization treatment. . This method is a low-temperature carbonization treatment for 12 to 24 hours in a short time of 12 to 24 hours for a material containing a high carbon ratio of hardly degradable fiber and high moisture content of garbage, and dioxins and other harmful substances. It is said that no material is generated.
[0006]
And as an apparatus applicable for thermally decomposing organic sludge, it is shown in JP-A-7-171546 in consideration of efficiency, easiness of granulation of the product, and installation location. There is a processing apparatus using a horizontally long stirring tank. This processing apparatus has a stirring blade having a horizontal rotating shaft in a horizontally long stirring tank having a jacket structure on the outside, and a rotating shaft provided outside the stirring tank is provided on a frame that supports the stirring tank. It is a device that is driven by a driving belt with a motor.
[0007]
However, since this apparatus receives the load of the rotating shaft on the side wall of the stirring tank, the strength of the stirring tank is insufficient when the apparatus is enlarged. Therefore, when it is going to raise the intensity | strength of the wall of a stirring tank, the steel material to be used will also become thick and there exists a problem which requires great cost.
[0008]
Therefore, a system in which a bearing is provided on a base outside the container and the rotating shaft is held by this bearing can be considered. In this case, since the load is received by the bearing, the thickness of the wall of the container can be reduced, and the cost problem can be solved. However, when a heating medium of about 200 ° C. is put in the jacket and heated, only the stirring tank expands. Then, the expansion and deformation of the stirring tank may cause deformation and distortion, and a gap may be generated between the rotating shaft and the rotating blade may come into contact with the inner surface of the stirring tank and stop rotating. In particular, when treating human waste sludge with a high water content, even a small gap between the rotating shaft is likely to leak, and even a small amount may cause problems in terms of odor and hygiene.
[0009]
[Problems to be solved by the invention]
The problem to be solved by the present invention is to suppress various problems caused by the occurrence of deformation and distortion even when the temperature of the stirring tank is increased in the organic sludge pyrolysis apparatus.
[0010]
[Means for Solving the Problems]
The organic sludge pyrolysis apparatus of the present invention includes a horizontally long stirring tank whose outer side is covered with a jacket, a support frame that supports the stirring tank, and a rotary blade that has a rotation axis in the horizontal direction provided in the stirring tank. In the organic sludge pyrolysis apparatus having a drive source for the rotary blades, the stirring tank is supported by the support frame by a plurality of support parts, and one of the plurality of support parts is a stirring tank in the vicinity of the rotation shaft Is provided on the side wall of the drive source and fixed to the support frame, and the other support parts are substantially the same height as the rotation shaft, and support the stirring tank so that it can move horizontally with respect to the support frame. It is supported by a frame.
[0011]
By fixing only the side wall on the drive source side of the agitation tank to the support frame at a position close to the rotation axis, when the agitation tank expands by receiving heat, this fixed location (fixed point) is the starting point for expansion. It becomes. The expansion in the direction parallel to the rotation axis is freely expanded to the opposite side of the fixed point by being supported by the support frame so that the stirring tank can move in the horizontal direction with respect to the support frame. Therefore, distortion can be prevented from occurring in the stirring tank.
[0012]
Further, in the expansion in the direction perpendicular to the rotation axis, since the fixed point is in the vicinity of the rotation axis and the support portion is at substantially the same height as the rotation axis, the vicinity of the rotation axis becomes the center of expansion. For this reason, since the stirring tank can expand in the direction perpendicular to the rotation axis substantially around the rotation axis, the generation of a gap between the rotation axis and the stirring tank and the contact between the rotating blade and the inner surface of the stirring tank are prevented. can do.
Further, since the drive source side wall is fixed to the support frame, there is an advantage that the shift of the chain or the belt is eliminated even when the rotation shaft is driven by the drive source via the chain or the belt.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples.
[0014]
1 is a longitudinal sectional view of an organic sludge pyrolysis apparatus of the present invention, FIG. 2 is a view taken along the line AA of FIG. 1, FIG. 3 is a front view, FIG. 4 is a plan view, and FIG. In the figure, (a) is a front view and (b) is a longitudinal sectional view.
[0015]
As shown in FIGS. 1 and 2, the organic sludge thermal decomposition treatment apparatus of the present invention is provided in a stirring tank 10, a support frame 20 that supports the stirring tank from below, and held in the support frame 20. The stirring blade 30 and a motor 40 for driving the stirring blade 30 are included.
[0016]
The agitation tank 10 is a container having a rectangular box shape at the top and a semi-cylindrical shape with a long bottom at the bottom and closed both ends. The outer side except the upper lid 15 has a jacket 14 so that the heat medium can be circulated. ing. The upper lid 15 of the agitation tank has an input hole 11 for introducing an object to be processed, and a discharge hole 12 for discharging the object to be processed at the lower part of the agitation tank 10. On the outer surface of one short side wall 25 of the stirring tank 10, there is a heat medium inlet 16 on the lower side and a heat medium outlet 17 on the upper side. Further, the two short side walls 25 of the stirring tank 10 each have a through hole 13, and the rotating shaft 31 penetrates rotatably. A gland packing 32 and an oil seal 33 are combined in the gap between the through-hole 13 and the rotating shaft 31 to make the rotation smooth and prevent leakage of the workpiece.
[0017]
Further, in the agitation tank 10, the short side wall 25 on the drive source side has a fixing plate 19 immediately below the through hole 13. The fixing plate 19 is fixed to the frame side fixed end 24 with bolts 27. In this case, the extension line at the center of the bolt 27 is at a position where it intersects the rotation axis of the rotary blade 30. The agitation tank 10 is fixed to the support frame 20 in the vicinity of the rotation shaft 31 only by the support portion of the short side wall 25 on the drive source side.
[0018]
The contact surface between the fixed plate 19 and the frame side fixed end 24 is preferably as close to the rotating shaft 31 as possible. If the contacting surface is provided below the rotating shaft 31 within 500 mm from the center of the rotating shaft 31, the stirring tank 10 and the rotating blade Deviation due to thermal expansion with 30 can be reduced.
[0019]
As shown in FIGS. 3 and 4, the support frame 20 includes a horizontal frame 21 provided at a height close to the rotation axis so as to surround the side surface of the stirring tank 10, and a vertical frame 22 and a vertical frame 22 that support the horizontal frame 21. And the gantry 23 to be operated.
[0020]
Further, as shown in FIG. 3, the stirring tank 10 has four protruding portions 50 on one side on the outer surface of the long side wall 26 with a space in a horizontal row. Each protrusion 50 is supported by a tank receiver 60 provided on the support frame 20 so as to be in contact with each other and move in the horizontal direction.
[0021]
The detailed structure of this support portion is shown in FIGS. 5 (a) and 5 (b). The tank receiver 60 includes a fixed plate 61 provided on the upper surface 28 of the horizontal frame 21, a lower sliding plate 62 provided on the fixed plate 61, and an L-shaped upper surface that is detachably fixed to the fixed plate 61 with bolts. It consists of a presser 63. On the other hand, the protruding portion 50 includes a protruding end 51 attached to the side surface of the agitation tank 10 and an upper sliding plate 52 provided on the lower surface thereof.
[0022]
The tank receiving portion 60 and the protruding portion 50 are in surface contact so that they can be moved in the horizontal direction only by the lower sliding plate 62 and the upper sliding plate 52. Further, the vertical movement of the agitation tank 10 is regulated by a gap between the upper surface presser 63 and the upper sliding plate 52.
[0023]
The contact surface between the tank receiver 60 and the protrusion 50 needs to be provided at a position sufficiently close to a horizontal plane including the rotation axis of the rotary blade 30. Preferably, the contact surface between the tank receiver 60 and the protrusion 50 is in a range of 20 mm upward and 20 mm downward with respect to the plane including the rotation axis. These sliding plates have high surface accuracy so that they can slide, and wear-resistant materials are used so that they can sufficiently withstand even under heavy loads.
As shown in FIG. 4, both end surfaces of the rotary shaft 31 of the rotary blade 30 are rotatably held by bearings 34 fixed to the support frame 20. Further, a sprocket 41 is provided at one end of the rotating shaft 31 and is connected to a motor sprocket 42 by a drive chain 43. A motor 40 as a drive source for rotating the rotary shaft 31 is attached to the lower portion of the rotary shaft 31 on the pedestal portion 23 of the support frame 20.
[0024]
Next, the movement of this apparatus will be described.
[0025]
By introducing the heated oil into the jacket 14 of the stirring tank 10 from the heating medium inlet 16, the inside of the stirring tank 10 is heated to 100 to 250 ° C. The organic sludge as the object to be treated is introduced from the introduction hole 11 of the stirring tank and is stirred by the rotary blade 30. The organic sludge is discharged from the discharge hole 12 after being heated and stirred for a predetermined time.
[0026]
During this treatment period, the agitation tank 10 expands due to heat, but only the vicinity of the rotation axis of the short side surface 25 on the drive source side is fixed to the support frame 20, so that the fixed support portion is the start of expansion. It becomes a point.
[0027]
As shown in FIG. 5, the agitation tank 10 is supported so as to be movable in the horizontal direction in other support portions. For this reason, the stirring tank 10 is not restrained by the upper sliding plate 52 of the protrusion 50 provided in the stirring tank 10 moving in the direction parallel to the rotation axis on the lower sliding plate 62 by the amount of expansion. Can expand freely.
[0028]
Further, regarding the expansion in the direction perpendicular to the vertical plane including the rotation axis (indicated by the arrow A in FIG. 5B), the upper sliding plate 52 moves with respect to the lower sliding plate 62. We have secured a fee. In addition, since the expansion center is sufficiently close to the rotation axis, the agitation tank 10 expands evenly on both sides of the rotation axis, so that there is very little misalignment of the axis with respect to the rotation axis. For this reason, a gap is not generated between the stirring tank 10 and the rotating shaft, and the stirring blade does not contact the inner surface of the stirring tank.
[0029]
Further, with respect to the expansion in the vertical direction, the contact surface of the upper sliding plate 52 and the lower sliding plate 62 is close to the expansion center in the vertical direction. do not do. For this reason, a gap is not generated between the stirring tank 10 and the rotating shaft, and the rotary blade 30 does not contact the inner surface of the stirring tank 10. Moreover, since there is nothing other than this support part that restricts the expansion in the vertical direction, the occurrence of distortion is small.
[0030]
【The invention's effect】
In the present invention, since the distortion due to the thermal expansion of the stirring tank is eliminated, a gap is generated between the stirring tank and the rotating shaft, the rotating blade comes into contact with the inner surface of the stirring tank and does not rotate, or the weld is detached. This can be prevented.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an organic sludge pyrolysis apparatus of the present invention.
FIG. 2 is a view taken in the direction of arrows AA in FIG.
FIG. 3 is a front view of an organic sludge pyrolysis apparatus according to the present invention.
FIG. 4 is a plan view of an organic sludge thermal decomposition apparatus according to the present invention.
FIGS. 5A and 5B are detailed views of a support portion, where FIG. 5A is a front view and FIG. 5B is a longitudinal sectional view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Stirring tank 11 Input hole 12 Discharge hole 13 Through-hole 14 Jacket 15 Upper cover 16 Heat medium inlet 17 Heat medium outlet 19 Fixing plate 20 Support frame 21 Horizontal frame 22 Vertical frame 23 Stand part 24 Frame side fixed end 25 Short side wall 26 Long side wall 27 Bolt 30 Rotating blade 31 Rotating shaft 32 Gland packing 33 Oil seal 34 Bearing 34
40 Motor 41 Sprocket 42 Motor sprocket 43 Chain 50 Protruding portion 51 Protruding end 52 Upper sliding plate 60 Tank receiving portion 61 Fixed plate 62 Lower sliding plate 63 Upper surface presser

Claims (1)

Organic sludge having a horizontally long stirring tank whose outer side is covered with a jacket, a support frame that supports the stirring tank, a rotary blade having a rotating shaft in the horizontal direction provided in the stirring tank, and a driving source of the rotary blade In the thermal decomposition treatment equipment,
The stirring tank is supported on the support frame by a plurality of support parts,
One of the plurality of support parts is provided on the drive source side wall of the stirring tank in the vicinity of the rotation shaft and is fixed to the support frame,
The other supporting portion is an organic sludge thermal decomposition treatment apparatus that is supported by the support frame so that the stirring tank can move in the horizontal direction with respect to the support frame, and the height of the other support portion is substantially the same as the rotational axis.

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