JP2003181495A - Apparatus for pyrolyzing organic sludge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic sludge pyrolyzing apparatus in which various problems caused by the deformation and strain of an agitation tank are restrained even when the temperature of the agitation tank rises. <P>SOLUTION: This organic sludge pyrolyzing apparatus has the long sideways agitation tank 10 the outside of which is covered with a jacket 14, a supporting frame 20 for supporting the tank 10, a rotary blade 30 which is arranged in the tank 10 and has a rotary shaft 31 in the horizontal direction and a drive source 40 of the blade 30. The tank 10 is supported by a plurality of supporting parts to be fixed to the frame 20. One of the supporting parts is arranged on the side wall 25 of the tank 10 on the source 40 side in the vicinity of the shaft 31 and other supporting parts are arranged at almost the same height as that of the shaft 31 in the positions that the tank 10 can be moved to the horizontal direction with respect to the frame 20. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for thermally decomposing organic sludge which generates compost by heating and stirring organic sludge. [0002] Generally, organic sludge, which is a residue obtained by treating sewage, night soil, food processing wastewater, and the like, is subjected to incineration, fermentation, carbonization, and the like. In the incineration treatment, organic sludge is usually mixed with combustible waste for incineration. However, it is considered that dioxins are generated due to incomplete combustion of organic sludge having a high water content. . In fermentation, organic sludge is fermented, decomposed and aged for about 20 days by mechanical treatment and 180 days by sedimentation.
This is a method in which microorganisms are decomposed over a long period of time, such as days.
This treated product has a large variation in the content of the active ingredient even after aging, and cannot be guaranteed for the active ingredient, and can be handled only as a special fertilizer with little added value. [0005] For this reason, recently, a method of performing carbonization treatment to stabilize the content of the active ingredient by pyrolyzing at a low temperature has been proposed. For example, Japanese Patent Application Laid-Open No. 2000-15794
No. 9 describes a method in which crushed garbage is heated to 100 ° C. or more and 250 ° C. or less while being stirred in a stirring tank provided with a heat medium jacket to perform low-temperature carbonization. This method performs low-temperature carbonization of an object to be treated containing a large amount of garbage having a high carbon ratio and a hardly decomposable fiber in a short period of time of 12 to 24 hours, as well as dioxins and other harmful substances. Substances are not expected to be generated. As an apparatus applicable for thermally decomposing organic sludge, considering the efficiency, the ease of granulation of the product, and the installation location, etc.
There is a processing apparatus using a horizontally long stirring tank as disclosed in Japanese Patent No. 171546. This processing apparatus has a stirring blade with a horizontal rotating shaft in a horizontally long stirring tank having a jacket structure on the outside, and a rotation shaft provided outside the stirring tank is provided on a gantry supporting the stirring tank. It is a device driven by a drive belt by a motor. However, in this apparatus, since the load of the rotating shaft is received by the side wall of the stirring tank, the strength of the stirring tank is insufficient when the size of the apparatus is increased. For this reason, when trying to increase the strength of the wall of the stirring tank, the steel material to be used becomes thick, and there is a problem that a large cost is required. In view of this, a method is conceivable in which a bearing is provided on a stand outside the container and the rotating shaft is held by the bearing.
In this case, since the bearing receives the weight, the thickness of the container wall can be reduced, and the problem in cost can be solved. However, when a heating medium of about 200 ° C. is put into the jacket and heated, only the stirring tank expands. And
This expansion of the stirring tank causes deformation or distortion, which may cause a gap between the stirring tank and the rotating shaft, or may prevent the rotating blades from rotating due to contact with the inner surface of the stirring tank. In particular,
When treating human waste sludge having a high moisture content, even a small gap between the rotating shaft and the sludge easily leaks, and even if a small amount is leaked, problems occur in odor and hygiene. [0009] The problem to be solved by the present invention is that, in an apparatus for thermally decomposing organic sludge, even if the temperature of the stirring tank becomes high, various problems caused by the occurrence of deformation and distortion occur. It is to suppress the problem. [0010] An apparatus for thermally decomposing organic sludge according to the present invention comprises a horizontally long stirring tank whose outside is covered with a jacket, a support frame for supporting the stirring tank, and an inside of the stirring tank. In the apparatus for thermally decomposing organic sludge having the provided rotary blades having a rotation axis in the horizontal direction and a driving source for the rotary blades, a stirring tank is supported by a support frame by a plurality of support portions, and One of them is provided on the drive source side wall of the stirring tank near the rotation axis and is fixed to the support frame, and the other support part is almost the same height as the rotation axis, and the stirring tank is Characterized by being supported by a support frame so as to be able to move in the horizontal direction with respect to. By fixing only the side wall on the drive source side of the stirring tank to the support frame at a position near the rotation axis, when the stirring tank expands due to heat, the fixed portion (fixed point) expands. The starting point for In addition, the expansion in the direction parallel to the rotation axis is such that the stirring tank is supported by the support frame so as to be movable in the horizontal direction with respect to the support frame, so that it can freely expand to the opposite side to the fixed point. Therefore, it is possible to prevent the occurrence of distortion in the stirring tank. In the expansion in the direction perpendicular to the rotation axis, the fixed point is located near the rotation axis and the support portion is located at almost the same height as the rotation axis. Therefore, the stirring tank can expand in the direction perpendicular to the rotation axis about the rotation axis, thereby preventing the generation of a gap between the rotation shaft and the stirring tank and the contact between the rotating blades and the inner surface of the stirring tank. can do. Further, since the drive source side wall is fixed to the support frame, there is an advantage that even when the rotary shaft is driven by the drive source via a chain, a belt, or the like, there is no displacement of the chain, the belt, or the like. Embodiments of the present invention will be described below based on examples. FIG. 1 is a longitudinal sectional view of the organic sludge pyrolysis apparatus of the present invention, FIG. 2 is a view taken along the line AA in FIG. 1, FIG. 3 is a front view, FIG. 4 is a plan view, and FIG. 3A is a front view, and FIG. 3B is a longitudinal sectional view. [0015] The apparatus for thermally decomposing organic sludge of the present invention comprises:
As shown in FIGS. 1 and 2, a stirring tank 10, a support frame 20 for supporting the stirring tank from below, and a support frame 20.
And a motor 40 for driving the stirring blade 30 provided in the stirring tank. The stirring tank 10 is a container having a rectangular box shape at the top and a semi-cylindrical shape at the bottom which is long at the bottom, and having both ends closed. have. In the upper lid 15 of the stirring tank, there is a charging hole 11 for charging an object to be processed.
Has a discharge hole 12 for discharging an object to be processed. 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 have through holes 13 respectively, and the rotating shaft 31 penetrates rotatably. A gland packing 32 and an oil seal 33 are combined in a gap between the through hole 13 and the rotating shaft 31 to make the rotation smooth and prevent leakage of the processing object. Further, in the stirring tank 10, the fixing plate 1 is provided on the short side wall 25 on the drive source side immediately below the through hole 13.
9 The fixing plate 19 is fixed to the frame-side fixed end 24 with bolts 27. In this case, the extension line of the center of the bolt 27 is located at a position crossing the rotation axis of the rotary blade 30. The stirring tank 10 is supported by the support frame 20 near the rotation shaft 31 only by the support of the short side wall 25 on the drive source side.
Fixed to. It is preferable that the contact surface between the fixed plate 19 and the frame-side fixed end 24 is as close to the rotating shaft 31 as possible.
When the distance is within m, the displacement between the stirring tank 10 and the rotary blade 30 due to thermal expansion can be reduced. 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, a vertical frame 22 supporting the horizontal frame 21, and a vertical frame. 22 comprises a pedestal 23. As shown in FIG. 3, the stirring tank 10 has four projections 50 on one side of the long side wall 26 at intervals in a horizontal row. Each protrusion 50
The tank receiving part 60 provided on the support frame 20 supports the two parts so that they come into contact with each other and move in the horizontal direction, thereby forming a support part. FIGS. 5A and 5B show the detailed structure of the support portion. The tank receiving part 60 is provided with the horizontal frame 21.
A fixed plate 61 provided on the upper surface 28, a lower sliding plate 62 provided on the fixed plate 61, and an L-shaped upper surface holder 63 detachably fixed to the fixed plate 61 with bolts. On the other hand, the protruding portion 50 is a protruding end 5
1 and an upper sliding plate 52 provided on the lower surface thereof. The tank receiving portion 60 and the projecting portion 50 are in surface contact with each other so as to be movable in the horizontal direction only by the lower sliding plate 62 and the upper sliding plate 52. The vertical movement of the stirring tank 10 is restricted by the gap between the upper surface pressing member 63 and the upper sliding plate 52. The contact surface between the tank receiving portion 60 and the projecting portion 50 is
It is necessary to provide it at a position sufficiently close to a horizontal plane including the rotation axis of the rotating blade 30. Preferably, the contact surface between the tank receiving portion 60 and the protruding portion 50 has a range of 20 mm upward and 20 mm downward with respect to a plane including the rotation axis. These sliding plates have a high surface precision so that they can slide, and use a wear-resistant material so that they can be sufficiently used even under a large load. As shown in FIG. 4, both end surfaces of the rotating shaft 31 of the rotating blade 30 are rotatably held by bearings 34 fixed to the support frame 20. A sprocket 41 is provided at one end of the rotating shaft 31, and is connected to a sprocket 42 of the motor by a drive chain 43. The motor 40 as a driving source for rotating the rotating shaft 31 is
It is attached to the lower part of the rotating shaft 31 on the base 23 of the zero. Next, the operation of this device will be described. The heated oil is introduced into the jacket 14 of the stirring tank 10 through the heat medium inlet 16 so that the stirring tank 1
Inside 0 is heated to 100-250 ° C. The organic sludge to be treated is charged through the charging hole 11 of the stirring tank and is stirred by the rotating blades 30. The organic sludge is discharged from the discharge holes 12 after being heated and stirred for a predetermined time. During this processing period, the stirring 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. It is the starting point for expansion. The stirring tank 10 is supported at other supporting portions so as to be movable in the horizontal direction as shown in FIG. For this reason, the stirring tank 10 is not restrained because the upper sliding plate 52 of the protrusion 50 provided on the stirring tank 10 moves on the lower sliding plate 62 by the amount of expansion in the direction parallel to the rotation axis. Can expand freely. The expansion in the direction perpendicular to the vertical plane including the rotation axis (indicated by the arrow A in FIG. 5B) is as follows.
The expansion allowance is secured by moving the upper slide plate 52 with respect to the lower slide plate 62. Moreover, since the center of expansion is sufficiently close to the rotation axis, the stirring tank 10 expands uniformly on both sides with respect to the rotation axis, so that the displacement of the axis with respect to the rotation axis is very small. Therefore, no gap is generated between the stirring tank 10 and the rotating shaft, and the stirring blade does not contact the inner surface of the stirring tank. Also, with respect to the vertical expansion, since the contact surface between the upper sliding plate 52 and the lower sliding plate 62 is close to the center of expansion in the vertical direction, the upper sliding plate 52 is moved with respect to the rotating shaft. Hardly go up and down. Therefore, no gap is generated between the stirring tank 10 and the rotating shaft, and the rotating blades 30 do not contact the inner surface of the stirring tank 10. In addition, since there is nothing other than the support portion that restricts the expansion in the vertical direction, the occurrence of distortion is small. According to the present invention, since the distortion caused by the thermal expansion of the stirring tank is eliminated, a gap is generated between the stirring tank and the rotating shaft, or the rotating blade contacts the inner surface of the stirring tank and rotates. Can be prevented and the welded portion can be prevented from coming off.

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 as viewed in the direction of arrows AA in FIG. 1; FIG. 3 is a front view of the apparatus for thermally decomposing organic sludge of the present invention. FIG. 4 is a plan view of the organic sludge pyrolysis treatment apparatus of the present invention. FIGS. 5A and 5B are detailed views of the support portion, wherein FIG. 5A is a front view and FIG. DESCRIPTION OF SYMBOLS 10 Stirring tank 11 Injection hole 12 Outlet hole 13 Through hole 14 Jacket 15 Top lid 16 Heat medium inlet 17 Heat medium outlet 19 Fixing plate 20 Support frame 21 Horizontal frame 22 Vertical frame 23 Base unit 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 Projection 51 Projection end 52 Upper sliding plate 60 Tank receiver Part 61 fixing plate 62 lower sliding plate 63 upper surface holding

Claims (1)

Claims: 1. A horizontally long stirring tank whose outside is covered with a jacket, a support frame for supporting the stirring tank, and a rotating blade provided in the stirring tank and having a horizontally rotating shaft. In an apparatus for thermally decomposing organic sludge having a driving source for a rotating blade, a stirring tank is supported on a support frame by a plurality of supporting portions, and one of the plurality of supporting portions is a stirring tank near a rotating shaft. The other supporting portion is provided on the driving source side wall and fixed to the supporting frame, and the other supporting portions are substantially the same height as the rotating shaft, and the stirring frame is movable horizontally with respect to the supporting frame. Thermal decomposition equipment for organic sludge supported in Japan.