JP3569131B2 - Granulation drying equipment - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an apparatus for granulating and drying sludge and the like.
[0002]
[Prior art]
Various types of sludge such as water sludge discharged in a large amount are dried and discarded, and are also granulated and dried and reused as agricultural and horticultural soil. These reused sludges are first dried in the sun or the like, and then subjected to a kneading step, a granulating step, and a drying step to become granular agricultural and horticultural soil.
[0003]
In the above-mentioned production process of agricultural and horticultural soil, for the purpose of reducing equipment costs and rationalizing the transportation of raw materials, both the granulation and drying processes may be performed by an integrated device. There is a granulation drying apparatus disclosed in Japanese Unexamined Patent Publication No. 6-56693. As shown in FIG. 6, the granulating and drying apparatus includes a screw feeder 42 for supplying sludge supplied from a hopper 41, a cylindrical rotary dryer 43, and a granulator connected to an inlet end of the rotary dryer 43. It is composed of a granule cylinder 44, a dry granular soil extraction chamber 45 provided at the outlet end of the rotary dryer 43, and an exhaust chamber 46 for exhausting steam evaporated from sludge.
[0004]
The granulating cylinder 44 is provided with a scraper 47 close to the inner peripheral surface of the granulating cylinder 44 so as to scrape sludge attached to the inner peripheral surface of the granulating cylinder 44. The sludge supplied from the screw feeder 42 is rounded and rounded while rolling in the granulating cylinder 44, and is sent to the rotary dryer 43 as granular soil.
[0005]
A jacket 48 for a heating gas is provided on the outer periphery of the rotary dryer 43, and the granular soil fed from the granulating cylinder 44 is dried. The dried granular soil is discharged from a discharge port 49 provided at a lower end of the discharge chamber 45.
[0006]
In this apparatus, a gas is supplied from a supply port 50 provided in the extraction chamber 45, and steam generated when the granular soil is dried is guided into the granulation cylinder 44, where the vapor is condensed by contact with cold sludge. By doing so, it can be used as a binder or adjust the water content of sludge. The supplied gas is discharged out of the apparatus from the discharge port 51 of the exhaust chamber 46.
[0007]
[Problems to be solved by the invention]
In the above-mentioned conventional granulation drying apparatus, sludge is granulated only by rolling in a granulation cylinder, so that the size of the granular soil varies, and there is a problem that extremely large granular soil is mixed. For example, dry granular soil for agricultural and horticultural use is required to have a diameter of at most 10 mm or less, and dry granular soil greatly exceeding this size must be removed before shipment.
[0008]
Accordingly, an object of the present invention is to provide a granulating and drying apparatus capable of supplying a rounded dry granular soil having a predetermined size or less.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention is directed to a cylindrical drying chamber which is arranged substantially horizontally and is rotatably driven at the raw material supply end side of the cylindrical drying chamber. In a granulation drying apparatus for granulating and drying the raw material supplied to the chamber and discharging the raw material from the discharge end of the drying chamber, a rotary blade for stirring the raw material is provided in the granulating chamber, and the drying chamber and the granulating chamber Thus, a configuration was adopted in which an annular partition plate was provided at the boundary with.
[0010]
That is, an annular partition plate is provided at the boundary between the granulating chamber and the drying chamber, the massive soil supplied from the kneading step is stored in the granulating chamber for a certain period of time, and the massive soil is provided by the rotating blades provided in the granulating chamber. Since the crushed chunks were finely crushed into chunks having a predetermined size or less, the crushed chunks were rolled to take corners, and the rounded granular soil overflowed from the partition plate and sent to the drying chamber. is there. In addition, since the rotating blades knead and soften the massive soil, it has an effect of forming a granular soil having a smooth roundness.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3 show general views of a granulating and drying apparatus. 1 is a front view, FIG. 2 is a plan view, and FIG. 3 is a side view. This granulation drying apparatus is provided in a cylindrical drying chamber 1 that is driven to rotate, a cylindrical granulation chamber 2 that is also connected to the inlet end of the drying chamber 1, and a granulation chamber 2. It is basically composed of a rotating blade 3, a hopper 4 for supplying a massive kneaded soil to the granulation chamber 2, and an outlet hood 6 provided at an outlet end 5 of the drying chamber 1 for discharging the dried granular soil. I have.
[0012]
The drying chamber 1 and the granulation chamber 2 are formed by an integral rotary drum 7 having both ends opened. An annular partition plate 8 is provided at the boundary between the drying chamber 1 and the granulation chamber 2 on the inner periphery of the rotary drum 7. A sprocket 9 and two tires 10 are mounted on the outer periphery of the rotating body 7. The rotating drum 7 has two pairs of rollers 13 mounted on a gantry 11 via bearings 12 and supports each of the tires 10, and a sprocket 15 and a sprocket 15 mounted on a rotating shaft of a motor 14 with a speed reducer. The chain 9 is driven to rotate by a chain 16 wound therearound.
[0013]
A plurality of heating tubes 17 are passed through the drying chamber 1 in the axial direction near the inner peripheral wall. These heating tubes 17 are connected to a steam pipe 19 via a rotary joint 18 attached to the outlet hood 6 and heat the drying chamber 1 with steam supplied from the steam pipe 19. Therefore, high thermal efficiency can be secured. In addition, a drain pipe 20 is also attached to the steam pipe 19.
[0014]
An inlet hood 21 is provided on the side of the granulation chamber 2 of the rotary drum 7, and both ends of the rotary drum 7 are opened into the inlet hood 21 and the outlet hood 6. The inlet hood 21 is also provided with a gas supply port 22 described later and a raw material outlet 23 for cleaning.
[0015]
The rotary blade 3 is connected to a rotary shaft 26 by a flange 24 and a tightening bolt / nut 25 so that the rotary blade 3 can be replaced with another type of rotary blade. The rotating shaft 26 is taken out to the outside through the inlet hood 21, supported by two bearings 27 mounted on the gantry 11, and connected to a rotating shaft of a motor 29 by a coupling 28.
[0016]
As shown in FIGS. 4 (a) and 4 (b), the rotating blades 3 are arranged at a lower portion of the rotating drum 7, and four paddle-shaped wings 30 are provided at regular intervals in the axial direction and perpendicular to the rotating direction. Each is provided radially. These rotary blades 3 are rotated in a direction opposite to the rotation direction of the rotary drum 7, and crush the massive kneaded soil 31 rolling at the lower part of the granulation chamber 2. By rotating the rotary blades 3 in the direction opposite to that of the rotary drum 7, the kneaded soil 31 moving together with the rotary drum 7 can be efficiently crushed from the opposite direction.
[0017]
The rounded granular soil that is crushed by the rotating blades 3 and tumbles while overflowing is overflowed from the partition plate 8 and sent into the drying chamber 1. At this time, the kneaded soil 31 that has not been sufficiently granulated has poor fluidity, and the fine kneaded soil 31 penetrates under the large kneaded soil 31, so that the partition plate 8 cannot overflow and the granulated soil 31 is not sufficiently granulated. Only the granular soil that has overflowed will overflow. Therefore, even if the length of the granulation chamber 2 is short, a sufficient granulation action is performed. Further, by changing the number of rotations of the rotary blades 3, the degree of crushing can be adjusted to change the size of the granular soil to be produced. By changing the rotation speed of the rotating blades 3 according to the physical properties of the kneaded soil 31 to be supplied, a granular soil of a certain size can be obtained without being affected by the physical properties of the kneaded soil 31.
[0018]
The granular soil fed into the drying chamber 1 is heated and dried by the heating tube 17 while rolling in the drying chamber 1, and sent out from the outlet end 5 to the outlet hood 6. The outlet hood 6 is provided with a gas outlet 32 for discharging the gas supplied from the gas supply port 22 of the inlet hood 21 so that the gas generated from the granular soil is discharged to the outside of the apparatus. It has become. The dried granular soil is discharged from an outlet 33 provided below the outlet hood 6.
[0019]
FIGS. 5A and 5B show another form of the rotating blade 34. The rotating blades 34 are provided with four blade-shaped blades 35 parallel to the rotating direction radially at regular intervals in the axial direction. Since the rotating blades 34 shear the kneaded soil, they are suitable for crushing hard kneaded soil.
[0020]
In the above-mentioned embodiment, paddle-shaped and blade-shaped blades are shown as rotary blades for crushing massive kneaded soil, but as a blade having an intermediate function between them, a blade body inclined with the rotation direction is provided. Propeller-shaped rotating blades can also be employed. Further, the number of wings arranged radially can be arbitrarily selected.
[0021]
【The invention's effect】
As described above, the granulation drying apparatus of the present invention provides an annular partition plate at the boundary between the granulation chamber and the drying chamber, and collects the bulk soil supplied from the kneading step in the granulation chamber for a certain period of time. The crushed mass is finely crushed into lumps having a predetermined size or less by rotating blades provided in the granulation chamber, and the crushed lumps are rolled to form a corner, and the rounded granular soil is separated from the partition plate. Since it overflows and is sent to the drying chamber, it is possible to supply a dry granular soil in which the grains are aligned to a predetermined size or less. In addition, since the rotating blades also have a function of kneading and softening the massive soil, it is possible to supply a dry granular soil having a smoother roundness.
[Brief description of the drawings]
1 is a partially cutaway front view showing an embodiment of a granulating and drying apparatus; FIG. 2 is a plan view of FIG. 1; FIG. 3 is a vertical side view taken along line III-III of FIG. 2; 1 is an enlarged sectional view of a main part of FIG. 1, b is a sectional view taken along line IV-IV of a. FIG. 5 is a front view showing a rotating blade of another embodiment, and b is a longitudinal side view thereof. Longitudinal sectional view showing a conventional granulation drying apparatus [Explanation of reference numerals]
REFERENCE SIGNS LIST 1 drying room 2 granulation room 3 rotating blades 4 hopper 5 outlet end 6 outlet hood 7 rotating drum 8 partition plate 9 sprocket 10 tire 11 gantry 12 bearing 13 roller 14 motor 15 sprocket 16 chain 17 heating tube 18 rotary joint 19 steam pipe 20 Drain pipe 21 Inlet hood 22 Supply port 23 Outlet port 24 Flange 25 Bolt and nut 26 Rotating shaft 27 Bearing 28 Coupling 29 Motor 30 Blade body 31 Kneaded soil 32 Discharge port 33 Removal port 34 Rotating blade 35 Blade body 41 Hopper 42 Screw feeder 43 Rotary dryer 44 Granulator 45 Extraction chamber 46 Exhaust chamber 47 Scraper 48 Jacket 49 Extraction port 50 Supply port 51 Discharge port

Claims (1)

A generally cylindrical granulation chamber is added to the raw material supply end side of the cylindrical drying chamber that is arranged substantially horizontally and is driven to rotate, and the raw material supplied to the granulation chamber is granulated and dried. In the granulation drying apparatus discharged from the discharge end of the drying chamber, a rotating blade for stirring the raw material is provided in the granulation chamber, and an annular partition plate is provided at a boundary between the drying chamber and the granulation chamber. Granulation and drying equipment.

Images