JP4505472B2 - Sludge drying equipment - Google Patents

Description

  The present invention relates to a drying apparatus capable of effectively heating an object to be dried and drying it efficiently.

  For example, sludge, sewage waste, food waste such as chicken excrement, okara etc., raw garbage, etc. in a sewage treatment plant may have a water content of several tens to about 90%. Therefore, when these materials are finally subjected to various treatments such as incineration, landfill, and utilization as compost raw materials, it is necessary to lower (dry) the moisture content prior to that.

  Various methods are known for drying such a water content that needs to be reduced (dried) (hereinafter referred to as “substance to be dried”). For example, although it has been carried out such as drying in the sun or air-drying, many drying apparatuses have been invented and used since efficient drying cannot be performed.

The following Patent Document 1 was invented by the inventors as a garbage dryer for separating garbage with a garbage separator and drying the crushed garbage.
Japanese Patent No. 3595201

  As shown in FIG. 4, the drying chamber 2 is a thin rectangular body that is internally provided with a horizontally extending cylinder 6 extending in multiple stages (eight stages in the drawing), and the end of the cylinder 6 is at the top or bottom. The end portions of the cylindrical body 6 are alternately connected to each other by the connecting portions 6A and formed into one.

  The uppermost cylinder 6 is provided with a garbage input port 7 that leads to the outside of the drying chamber 2, and the lowermost cylinder 6 is provided with a garbage outlet 8 that leads to the outside of the drying chamber 2.

  Although not shown in the drawing, a pressing cylinder for pushing the garbage introduced from the garbage input pipe port into the cylindrical body 6 is provided above the garbage input port 7. A conveyor belt for conveyance is provided below the garbage discharge port 8.

  Moreover, the screw conveyor 12 is each incorporated in the cylinder 6 of each step. The screw conveyors 12 at each stage are arranged so that the forward path and the return path are alternately up and down. Each screw conveyor 12 is rotated by the rotation of the motor 13 by the interlocking mechanism formed by the chain 14 and the sprocket 15.

  In addition, fine particles 16 such as glass or ceramics of a heat resistant material are filled around the cylinder 6 in the drying chamber 2.

  Further, a steam outlet 17 through which steam generated in the cylinder 6 is sent out is provided in the connecting portion 6 </ b> A of the cylinder 6, and one end of the steam delivery pipe is connected to the steam outlet 17.

  Since the garbage in the cylinder 6 is pushed in from the garbage input port 7 and is transported while being compressed by the screw conveyor 12, the moisture contained in the garbage is separated in the cylinder 6. The separated moisture is converted into steam by the hot air received by the cylinder 6, and is sent from the cylinder 6 to the primary combustion chamber by the feeding means, and is vaporized in the primary combustion chamber.

  In addition, since the cylindrical body 6 is provided in multiple stages in the vertical direction and the ends are alternately communicated with each other in the vertical direction, the garbage is transported for a long distance, the drying time is increased, and a small drying chamber is formed. Even get enough drying.

  In addition, the cylindrical body 6 is not directly exposed to flames, and due to the indirect heat and the periphery of the cylindrical body 6 is filled with the fine particles 16, deformation of the cylindrical body 6 due to heat is prevented, and the fine particles The body 16 has heat retention and saves fuel.

  The above-mentioned Patent Document 1 is a garbage dryer, which is to be dried on the screw of the screw conveyor 12 for a high-viscosity to-be-dried object or a to-be-dried object that contains a lot of solids (for example, sludge or food waste). A thing adheres and it becomes a thing with very bad drying efficiency.

  In addition, since the cylindrical body 6 is provided in multiple stages in the vertical direction and the end portions are alternately communicated with each other in the vertical direction, the cylindrical body 6 is transported over a long distance, and the drying time is increased. However, the fuel cost for burner combustion rises accordingly.

  The object of the present invention is to overcome the disadvantages of the above-mentioned conventional example, and to be dried even if it is a dried object having a high viscosity or a dried substance containing a lot of solids (for example, sludge, chicken manure, food waste, etc.) It is an object of the present invention to provide a drying apparatus such as sludge that can be dried well and can save fuel costs.

In order to achieve the above-mentioned object, the present invention according to claim 1 is provided with a cylindrical body in which a screw conveyor is incorporated in a drying chamber and is extended in the horizontal direction in multiple stages in the vertical direction, and each cylindrical body has an end portion. Are connected to the end of the upper or lower cylinder alternately and formed into one, and the screw conveyor is arranged so that the forward path and the return path are alternated vertically, and the end cylinder communicates with the outside of the drying chamber. In the drying apparatus in which the inlet is provided and the outlet at the other end is provided with a discharge port that leads to the outside of the drying chamber, the screw shaft of the screw conveyor is hollow, and one end is supported by a bearing through a bushing made of gold. It is supported also on the outer periphery of the bearing to form a oil supply groove for grease, and summarized in that an electric heater is disposed inside the screw shaft through the bearing end of the screw shaft of the screw conveyor It is.

  According to the first aspect of the present invention, since the electric heater is provided in the screw shaft of the screw conveyor, it can be heated from the inside and outside of the screw conveyor together with the heating by the burner. Even if it is a thing to be dried and carbonized and has a high viscosity or a substance to be dried containing a large amount of solids (for example, sludge or food waste), the substance to be dried can be successfully dried.

  Further, by heating from the inside of the screw shaft of the screw conveyor, the amount of heating from the outside of the cylindrical body can be reduced correspondingly, and the fuel cost can be reduced.

Furthermore, the electric heater penetrates the bearing at the end of the screw shaft of the screw conveyor and is arranged in the screw shaft, so that the electric heater does not rotate even if the screw shaft rotates, Even if the screw shaft expands due to heat, it is not affected.

  As described above, the drying apparatus such as sludge according to the present invention can efficiently dry a to-be-dried object even if the object to be dried has a high viscosity or a to-be-dried substance containing a large amount of solids. Can also save money.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal side view of a main part showing one embodiment of a drying apparatus for sludge and the like of the present invention. In the figure, 12 is a screw conveyor.

  In the present invention, as in the conventional example shown in FIG. 4, the screw conveyor 12 is built in the cylindrical body 6. As shown in FIG. It is provided to extend in the lateral direction.

  Each cylindrical body 6 is formed in one piece with the ends thereof alternately communicating with the ends of the upper or lower cylindrical body 6, and the screw conveyor 12 is arranged so that the forward path and the backward path are alternated up and down. .

  In the present embodiment, the uppermost cylinder 6 is provided with an inlet 18 that communicates with the outside of the drying chamber 2, and the lowermost cylinder 6 is provided with an outlet 19 that communicates with the outside of the drying chamber 2.

  In FIG. 2, 20 is a main hopper, 21 is a sub hopper, the main hopper 20 is provided with a take-out screw conveyor 22 and conveyed to the sub hopper 21, and the sub hopper 21 is provided with a loading screw conveyor 23. It is conveyed to the inlet 18.

  A discharge screw conveyor 24 is placed at the discharge port 19 to discharge the dry matter α. In the figure, 3 is a motor for driving the screw conveyor.

  In the figure, reference numeral 1 denotes a deodorizing treatment chamber, which is connected to the drying chamber 2 by a two-chamber connecting duct 5, and the combustion gas in the drying chamber 2 is heated by a burner 4b to decompose dioxins (800 ° C.).

  Both the drying chamber 2 and the deodorizing treatment chamber 1 apply negative pressure (blower suction), and 25 is a suction blower.

  In the above-described embodiment, the uppermost cylinder 6 is provided with an inlet 18 that communicates with the outside of the drying chamber 2, and the lowermost cylinder 6 is provided with an outlet 19 that communicates with the outside of the drying chamber 2. What was thrown in was taken out from the lower part, but on the contrary, the uppermost cylinder 6 was provided with a discharge port leading to the outside of the drying chamber 2, and the lowermost cylinder 6 was provided with an inlet opening leading to the outside of the drying chamber 2. It may be conveyed from the bottom to the top and taken out.

  In the present invention, the screw shaft 12a of the screw conveyor 12 provided inside the cylindrical body 6 extending in the horizontal direction in multiple stages in the vertical direction is hollow, and the electric heater 26 is disposed in the screw shaft 12a. 12b is a screw blade. As an example, the electric heater 26 is a nichrome wire heater built in a sheath of SUS304 having a power source of AC 200 V, a capacity of 4.2 kW [1.4 kW × 3 (Δ connection)], and a diameter φ8.

  Although the screw shaft 12a is not shown, one end is connected to the motor 3 side, and the other end is pivotally supported by a bearing 28 via a bush 27 made of gold wire as shown in FIG. An oil supply groove 29 for injecting grease was formed on the outer periphery of the bearing 28.

  The electric heater 26 is long as shown in FIG. 3, and is disposed in the screw shaft 12a through the bearing 28.

  In this way, the sludge is pushed into the cylinder 6 from the charging port 18, conveyed by the screw conveyor 12, and heated (about 550 ° C.) by the burner 4 a from the outside of the cylinder 6 in the drying chamber 2. The cylinder 6 may be formed with a hole 6b to promote heating from the outside.

  In addition, the screw shaft 12a is also heated from the inside of the screw conveyor 12 by the electric heater 26 (about 350 ° C.) and dried.

  Moisture and exhaust gas coming out of the sludge is sent to the deodorizing treatment chamber 1 through the two-chamber connecting duct 5 and further heated to remove dioxins and the like.

  As described above, the cylindrical body 6 is provided in multiple stages in the vertical direction, and the end portions are alternately communicated with each other in the vertical direction, so that the sludge is transported for a long distance, the drying time is increased, and the small drying is performed. Even in a room, it is thoroughly dried.

  Moreover, even if the screw shaft 12a of the screw conveyor 12 rotates, the electric heater 26 does not rotate, and even if the screw shaft 12a expands due to heat, the electric heater 26 is not affected.

It is a vertical side view of the principal part which shows one Embodiment of drying apparatuses, such as sludge of this invention. It is explanatory drawing of the whole drying apparatuses, such as sludge. It is a side view of an electric heater. It is a partial vertical side view which shows one Embodiment of the garbage dryer which is a prior art example.

DESCRIPTION OF SYMBOLS 1 ... Deodorizing treatment chamber 2 ... Drying chamber 3 ... Motor 4a, 4b ... Burner 5 ... Two-chamber connection duct 6 ... Cylindrical body 6A ... Connection part 6b ... Hole 7 ... Garbage input port 8 ... Garbage discharge port 12 ... Screw conveyor 12a ... Screw shaft 12b ... Screw blade 13 ... Motor 14 ... Chain 15 ... Sprocket 16 ... Fine granule 17 ... Steam outlet 18 ... Input port 19 ... Discharge port 20 ... Main hopper 21 ... Sub hopper 22 ... Extraction screw conveyor 23 ... Input screw conveyor 24 ... Discharge screw conveyor 25 ... Blower 26 ... Electric heater 27 ... Bush 28 ... Bearing 29 ... Oil supply groove

Claims (1)

In the drying chamber, there are provided cylinders with screw conveyors built in a multi-stage extending vertically in the vertical direction, and each cylinder is alternately communicated with the end of the upper or lower cylinder. The screw conveyor is arranged so that the forward path and the backward path are alternately arranged up and down, and the end cylinder is provided with a charging port leading to the outside of the drying chamber, and the other end cylinder is provided in the cylinder. In a drying device provided with a discharge port that leads to the outside of the drying chamber, the screw shaft of the screw conveyor is hollow, one end is supported by a bearing via a boring bush, and an oil supply groove for injecting grease is provided on the outer periphery of the bearing. An apparatus for drying sludge and the like, characterized in that an electric heater is disposed in the screw shaft through a bearing at the end of the screw shaft of the screw conveyor .

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