JPH07225081A - Rotary type dryer - Google Patents

Abstract

PURPOSE:To prevent clogging, etc., of a material to be dried and to uniformly dry and stably operate by supporting a screw shaft by an end disposed in an inlet of a kiln body, and winding a screw blade on its periphery except an exhaust port of a spiral passage. CONSTITUTION:A vapor heating tube 23 for heating to dry a material to be dried is supported by a support 25 inside a kiln body which is rotatably supported. A spiral passage is formed of a screw blade 19 to be rotated by a drive motor 16 and its casing 20 at an inlet of the body. Further, after the material to be dried is fed via the passage, it is discharged from its end cutout to the inlet of the body. In this case, a screw shaft is supported by both inner and outer bearings 24, 17 at the end disposed in the inlet of the body. The blade 19 is wound on a periphery of the shaft except an exhaust port made of the cutout of the passage. Thus, clogging, etc., of the material to be dried is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary dryer,
Specifically, in a rotary dryer that dries coal through a steam heating pipe installed inside a rotatable kiln body, a rotary dryer that prevents clogging of coal at the kiln inlet and ensures stable operation. It relates to a drying device.

[0002]

Coke is used as a raw material for iron making,
This coke is manufactured by subjecting it to dry distillation in a coke oven after a predetermined pretreatment. Unlike other fuel coals, blast furnace coke coals are so-called coal coals that require various properties such as burnability, and are supplied in the state of being washed from the mountain.

On the other hand, since the coke coal is supplied to various destinations, and the properties and the state of setting of the coal are also varied accordingly, the coking is minimized to minimize the influence on coking. Drying is carried out as one of the pre-treatments prior to carbonization in the furnace, and the effect of reducing the total calorific value required for carbonization and increasing the coke oven production capacity by drying prior to coking. Has been achieved.

As one of the dryers, a rotary dryer as shown in FIGS. 7 and 8 is used.

That is, in FIG. 7, reference numeral 1 is a conveyor for supplying raw materials, and 2 is a screw feeder for supplying raw materials.
D, 3 kiln body, 4 tires, 5 drive gear, 6
Is a dust collector, 7 is an air heater, 8 is a pushing fan, 9 is a supporting roller, 10 is a drive motor, 11 is a conveyor for discharging raw materials, 12 is a steam neck, and 13 is for discharging dust. A screw feeder, 14 is an exhaust fan, and 15 is an exhaust pipe.

As is apparent from FIG. 7, the coal is transferred to the conveyor 1
Is supplied to the screw feeder 2 through the screw feeder 2 and is then supplied into the kiln body 3 which constitutes a rotary dryer.

In the rotary dryer, a screw feeder 2 is provided at one end, and the kiln body 3 is rotatably supported by a pair of tires 4 and a support roller 9, and a drive gear 5 and a drive motor 10 are provided. As a result, the kiln body 3 rotates on the pair of tires 4. By this rotation, coal flows in the kiln body 3 toward the other end and is dried during this. The coal, the moisture content of which has been adjusted and dried, is discharged to the discharging conveyor 11, and thereafter, the coal is dry-distilled in a coke oven to be coked.

As shown in FIG. 8, a steam heating pipe 23 is vertically installed in the kiln body 3, and the steam heating pipe 23 heats and dries the coal. Push-in fan 8 and air heat
The kiln body 3 through the screw feeder 2 by the ta 7
Sent in.

The steam drain, which has been dried in the kiln body 3, is discharged from the steam neck 12 at the other end. The exhaust gas is forcibly sucked by the exhaust fan 14 through the dust collector 6, and is discharged to the outside through the exhaust pipe 15 such as a chimney.

Further, the rotary dryer having the kiln body 3, the screw feeder 2 and the steam heating tube 23 is shown in detail in FIG.

FIG. 8 is an explanatory view in which a part of the rotary dryer of FIG. 7 is enlarged and a part thereof is shown in cross section. In FIG. 8, 16 is a drive motor for driving the screw feeder 2 for supplying the raw material, 17 is a bearing for supporting the screw shaft 191, 18 is a casing of the screw feeder 2, and 19 is a screw feeder. The rotary blades of the screw wound around the screw shaft 191 at da 2 are shown. Further, 20 is a casing of the screw feeder 2, and this casing is
The sing 20 has a double air-tight structure in which heated air is pushed in, which promotes drying. Reference numeral 21 is a steam supply pipe, 22 is a steam header, and 23 is a steam heating pipe. The heating steam is sent from the steam header 22 to the steam heating pipe 23 through the supply pipe 21, and the latent heat of the steam dries the coal. 24 is the bearing of the screw feeder 2 and 2
Reference numeral 5 is a support for the steam heating pipe 23.

In this rotary dryer, the screw feeder 2 is composed of a casing 18, rotary blades 19, a screw shaft 191, and a drive motor 10. A spiral passage is formed between the rotary blade 191 and the casing 18, coal is pushed through the spiral passage, and the coal passes through the discharge port 181 formed by a notch at the tip of the casing 18 and coal is fed into the kiln body 3. Supplied within.

Inside the kiln body 3, steam heating pipes 23 are vertically provided inside, and the steam heating pipes 23 are supported by a support 25.

In the rotary dryer having the above structure, the coal fed through the screw feeder 2 has a large amount of moisture, so that the inlet of the kiln body 3 is likely to be clogged. For this purpose, as shown in FIG. 7, an air heater 7 is provided at the inlet of the kiln body 3 and on the discharge side of the pushing fan 8 for heating air by using a steam drain generated during drying as a heat source. , This preheats the air and the kiln body 3
Hot air is blown into the entrance of the.

Further, the coal at the inlet of the kiln body 3 has a very large amount of moisture, and the amount of heat exchange increases accordingly. In each steam heating pipe 23, the amount of steam drain in which steam loses latent heat and liquefies increases, and the amount of this drain generated and the amount of drain drained to the steam neck 12 are determined by the kiln body 3. It is unbalanced because it is inclined. When this imbalance occurs, the heating of the steam heating pipe 23 is rate-controlled, but if this is done, the coal will be clogged and the coal will be discharged from the discharge port 181 of the screw feeder 2.
Easy to adhere to.

In order to prevent this, the action of raising the pressure of the heating steam to raise the temperature of the steam heating pipe 23 at the inlet of the kiln body 3 is taken. If such an action is taken, the coal will be overdried, dust will be generated, and there will be a problem that operation management will be impossible.

[0017]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned drawbacks, and specifically, prevents clogging of the material to be dried with coal at the inlet of the kiln body which is equipped with a screw feeder. In particular, we propose a rotary dryer with improved inlets so that coal can be sent and flow over the entire length of the kiln body.

[0018]

That is, in a drying device according to the present invention, a steam heating pipe for heating and drying a material to be dried such as coal has a support inside a kiln body rotatably supported. A spiral passage is formed between the screw blade rotating around the screw shaft and its casing at the entrance of the kiln body, and the material to be dried passes through this spiral passage. In a rotary dryer that is equipped with a screw feeder that is discharged from a discharge port consisting of a notch at the tip, the screw shaft is located in the inlet of the casing kiln body of the casing. While being rotatably supported by, the screw blade is wound around the screw shaft except for the region corresponding to the spiral passage discharge port.

Further, a steam heating pipe for heating and drying a material to be dried such as coal is provided vertically inside the kiln body rotatably supported through a support, and an inlet of the kiln body is provided. In the part, a spiral passage is formed between the screw blade rotating around the screw shaft and its casing, and the material to be dried is sent through the spiral passage,
In a rotary dryer equipped with a screw feeder that discharges from a notch at the tip, the rear end of the screw shaft is made to project outward from the inlet of the kiln body, and at this protruding part the screw is It is characterized by supporting the shaft.

Hereinafter, these means and their functions will be described in more detail with reference to the drawings.

1 and 2 are explanatory views showing a cross section of a part of an inlet portion of a rotary dryer according to an embodiment of the present invention. 1 and 2, the same components as those of the rotary dryer shown in FIG. 8 are designated by the same reference numerals.

First, in FIG. 1, the kiln body 3 whose inlet is shown is rotatably supported via a tire 4 and a supporting roller 9 as in the case shown in FIG. Inside the kiln body 3, a steam heating pipe 23 for heating and drying a material to be dried such as coal is provided in a vertically long shape.

A screw feeder 2 is provided at an inlet portion which constitutes one end of the kiln body 3. The screw feeder 2 is composed of a screw shaft 191, a screw blade 19 and a casing 18, which are similar to those shown in detail in FIG. 8, and the screw shaft 191 is rotationally driven by the drive motor 16. Therefore, the screw blade 19 rotates around the screw shaft 191, and the coal to be dried is fed through the spiral passage formed between the rotating screw blade 19 and the casing 18.

The tip of the casing 18 is notched, and the coal is discharged from the discharge port 181 formed of this notch and supplied to the inlet of the kiln body 3.

Inside the kiln body 3, a steam heating pipe 23 is provided vertically along the inside thereof, and the coal is heated by the steam heating pipe 23 and dried. The dried coal is sent to a coke oven in the same manner as shown in FIG. 7 and is subjected to dry distillation coke.

In the rotary dryer constructed as described above, the screw shaft 191 of the screw feeder 2 is rotatably supported at a position located inside the kiln body 3 of the casing 18, but as shown below. , Screw blade 1
No. 9 does not wind around the portion corresponding to the discharge port 181, but the screw blade 19 is wound around the screw shaft 191 except for this corresponding portion.

When the tip portion of the screw feeder 2 is constructed as described above, the spiral passage for feeding coal is different from that shown in FIG. 8 only from the coal charging port 182 to the discharge port 181. The screw blade 19 is not formed at a position corresponding to the discharge port 181. That is,
There is no spiral passage.

In the screw feeder of the conventional drying device, as shown in FIG. 8, the screw blades 19 are wound around the entire length of the screw shaft 191. The tip of the screw shaft 191 is casing 1 inside the kiln body 3.
8 is supported via an internal bearing 24 at the front end of the casing 8, and the rear end is outside the kiln body 3 and at the rear end of the casing 18 is an external bearing 17.
Is supported through.

For this reason, when coal becomes clogged at the entrance of the kiln body 3, coal accumulates at the steam heating pipe 23, and in particular, the tip end portion that supports the tip end of the screw shaft 191 of the casing 18. The coal is compacted between the screw blade 19 and the screw blade 19. As a result, an overload is applied to the drive motor 16 of the screw feeder, causing troubles such as bending of the screw blade 19. On the other hand, in the drying device according to the present invention, as described above, the screw blade 19 is not wound around the entire length of the screw shaft 191, and the screw blade 19 is not wound around the corresponding portion of the discharge port 181. The spiral passage is not formed in the. For this reason, coal is not forcibly sent by the screw blades 19 at the discharge port 181, and troubles due to the compaction that occurs in the conventional example do not occur.

As described above, the trouble caused by consolidation can be eliminated by the following configuration.

That is, FIG. 2 is an explanatory view showing a cross section of a part of an inlet portion of a drying apparatus according to another embodiment of the present invention, in which the screw shaft 1 around which the screw blades 19 are wound.
A part of 91, that is, a rear end portion is extended and projected to the outside of the kiln body 3, and the protruding portions support the outer bearings 26 and 27 at at least two places.

This support can be constituted by any means as long as the screw shaft 191 can be supported. From the top of increasing the support moment, the outer bearings 26, 2 of the two fulcrums
It is preferable to support at intervals of 7 with a certain temperature.

Further, in connection with supporting the screw shaft 191 outside the kiln body 3 as described above, the tip of the casing 20 can be opened. Like this
When the tip of the sing 20 is opened, as shown in FIG. 2, the screw blade 19 extends over the entire length of the screw shaft 191.
Can be wound around, and the spiral passage between the two allows the coal to be forcibly and constantly sent, and the coal can be smoothly supplied.

While the screw feeder 2 is constructed as described above at the inlet of the kiln body 3, the inlet can be constructed as follows in conjunction with this.

At the inlet of the kiln body 3, a support 25 for supporting the steam heating pipe 23 is arranged inside the kiln body 3 so as to form a spiral shape. The support 25 arranged in a spiral shape is provided with a coal feeding function by the support 25, and the support 25 can be arranged in any spiral arrangement as long as the feed function can be provided. it can.

That is, FIG. 3 is an explanatory view schematically showing the kiln body 3, and the AA cross section and the BB cross section of the kiln body 3 shown in FIG. 3 are shown in FIGS. 4 and 5, respectively, and FIG. FIG. 4 is an explanatory view showing the mounting position of the support 25 by unfolding the inside of the kiln body 3 shown in FIG. As is apparent from FIGS. 3, 4, 5, and 6, the support 25
, The support 25 not only supports the steam heating pipe 23, but also the support 2
5 has a function of forcibly and steadily sending coal, and coal is sent between the steam heating pipes 23. In particular, the proportion of coal at the inlet of the kiln body 3, that is, the space factor, decreases and The trouble of can be solved. Further, the coal that is constantly sent is heat-exchanged without being overheated, and the drying is constantly performed.

[0037]

As described above in detail, according to the present invention, the steam heating pipe is vertically provided inside the kiln body through the support, and the screw feeder is attached to the inlet portion of the kiln body. The rotary blade of the screw feeder is wound around the screw shaft of the screw feeder except for the screw feeder discharge port.

Further, the rear end of the screw shaft is projected to the outside of the kiln body, and the projecting portion supports the screw shaft.

Therefore, the clogging of the kiln body, which has been frequently generated in the past, and other troubles such as coal can be eliminated, and the coal can be dried uniformly without overheating prior to coking, and stable operation can be achieved. Can be implemented.

Further, a support for supporting the steam heating tube is attached in a spiral shape in the kiln body. Therefore, the support itself has a function of forcibly sending coal and the like, and can greatly reduce the space factor of coal at the entrance of the kiln body, which also causes troubles such as clogging of the entrance. The width can be relaxed.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a cross section of a part of an inlet portion of a drying device according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a cross section of a part of an inlet portion of a drying device according to another embodiment of the present invention.

FIG. 3 is an explanatory view showing the kiln body shown in FIGS. 1 and 2 as a schematic view.

FIG. 4 is a cross-sectional view taken along the line AA shown in FIG.

5 is a cross-sectional view taken along the line BB shown in FIG.

FIG. 6 is an explanatory view showing a mounting manner of a support in the kiln body as a development view.

FIG. 7 is a layout view of a conventional rotary dryer.

FIG. 8 is an explanatory view showing a cross section of a part of the inlet of the kiln body of FIG.

[Explanation of symbols]

 1 Conveyor for supplying raw material 2 Screw feeder for supplying raw material 3 Kiln body 4 Tire 5 Drive gear 6 Dust collector 7 Air-heater 8 Pushing fan 9 Support roller 10 Drive motor 11 For discharging raw material Conveyor 12 Steam neck 13 Screw feeder for discharging dust 14 Exhaust fan 15 Exhaust pipe 16 Driving motor for screw feeder 17 External bearing 18 Casing of screw feeder 19 Screw blade 20 Casing 21 Steam supply pipe 22 Steam header 23 Steam heating pipe 24 Internal bearing 25 Steam heating pipe support

Claims (3)

[Claims] 1. A steam heating pipe for heating and drying a material to be dried such as coal is provided inside a rotatably supported kiln body in a longitudinal direction through a support, and an inlet portion of the kiln body is provided. A spiral passage is formed between a screw blade rotating around the screw shaft and its casing, and the material to be dried is sent through the spiral passage, and then a discharge formed by a notch at the tip is formed. The screwdriver discharged from the outlet
In a rotary dryer having a duck attached thereto, the screw shaft is rotatably supported by a tip portion located in an inlet portion of the kiln body of the casing,
A rotary drying device, wherein the screw blade is wound around the screw shaft except for a region corresponding to the spiral passage discharge port. 2. A steam heating pipe for heating and drying a material to be dried, such as coal, is provided vertically inside a kiln body rotatably supported, and is provided at an inlet portion of the kiln body. A spiral passage is formed between a screw blade rotating around the screw shaft and its casing, and the material to be dried is sent through the spiral passage, and then a discharge formed by a notch at the tip is formed. The screwdriver discharged from the outlet
In a rotary dryer having a da, the rear end of the screw shaft is projected outward from the inlet of the kiln body, and the screw shaft is supported by the protruding part. Tumble dryer. 3. The support is attached so as to form a spiral shape in the kiln body, and the steam heating tube is supported by the support having the spiral shape. Alternatively, the rotary type drying device for a dry place according to 2.