JPH0746008B2 - Rotating drum cooling device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an apparatus for cooling a substance treated under heating and high temperature as quickly as possible, and more specifically, a rotary drum is used to scatter the contents. And a double-jacket mechanism for cooling the contents with cold water and forced air.

(Problems with the prior art) Pulp and paper mills use a large amount of water in the manufacturing process,
The amount of water drained in the final process is more than tens of times that of the product.

From the viewpoint of environmental protection, this waste water is often discharged by suspending and removing suspended solids in a settling tank such as a clarifier and adjusting the acidity within a certain range at the same time.

In this case, the precipitate is further dewatered by a centrifugal concentrator or the like and incinerated by an incinerator such as a rotary kiln.
The sludge incineration ash incinerated by the incinerator may be discarded as it is, but if the incinerator ash contains useful components, it is widely used. In the case of using useful components in the above incinerated ash, transportation,
For convenience of use, kraft paper bags need to be packed, but the temperature of incinerated ash reaches 900 ° C at the rotary kiln outlet, for example. In order to pack the incinerated ash into a kraft paper bag with an automatic packer, it is necessary to cool it to a temperature of at least 60 ° C or less, but it will reduce a large amount of high-temperature incinerated ash to a temperature at which bagging work is possible in a short time. Is very difficult.

Conventionally, as the cooling device, a vibration type conveyor is mainly used as shown in FIG. 4, but these have a drawback that they are fixed type, the installation floor area of the equipment is large, the required power is large, and the cooling efficiency is low. .

Further, it has been known that a rotary drum device having a double wall is conventionally used to cool a heat-treated product and forcedly ventilates cooling water and cooling air. However, in this conventional apparatus, even if the drum rotates, the heat-treated material always stays in the lower part of the drum as shown in FIG.
The cooling effect is not so great.

(Means for Solving Problems) The present invention is a rotation for introducing a heat-treated product from one side of a rotating drum which is inclined and discharging the heat-treated product from the other side, during which the heat-treated product is cooled to a certain temperature or lower. In the drum type cooling device, a plurality of scooping blades are arranged in the longitudinal direction of the inner surface of the rotary drum, and the radially inner tip portions of these scooping blades are bent toward the rotational direction of the rotary drum. In addition, the rotating drum has a double cylindrical portion, and a mechanism is provided for cooling water to pass through the cylindrical portion. Further, there is a mechanism for forcing cooling air to flow in a direction opposite to the traveling direction of the heat-treated product. The present invention relates to a rotary drum cooling device characterized by the above.

The present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes an inlet chute which is guided to a cooling drum which is arranged with its inlet side positioned upward, and incinerated high temperature sludge or the like passes through the chute 1 to a cooling drum main body 2 having a double structure. Guided in the inner cylinder. The cooling water from the outside passes through the space 3 formed between the inner and outer cylinders from the double jacket 4 which is swirled around the main body by the rotary joint 7
The inner surface of the drum is cooled and discharged from the joint 8 to the outside. A plurality of scooping blades 9 are arranged in the longitudinal direction of the inner surface of the drum body 2, and the radially inner tip portions of these scooping blades are bent in the rotation direction of the rotary drum. Therefore, according to the rotation of the drum, the blade lifts the contents (material to be cooled) to the upper part, and when the drum further rotates, the contents disengage from the blade and fall by gravity as shown in FIG. It will be sprinkled inside and it will increase the contact with the air. In this case, the radially inner tip of the blade bends in the direction of rotation of the rotating drum, so the content (material to be cooled) is approximately 60 ° to 80 ° with the lower end of the drum as the base point. As it is lifted and falls from that point to the lower part (see Fig. 3 of the drawing), the cooling effect of the contents becomes very large. If the tip of the scooping blade is not bent, as shown in Fig. 6 of the drawings, the contents fall to the lower part when rotated slightly from 45 ° around the lower end of the drum, and the cooling effect is small. Become. On the other hand, cooling air is sent from the hood 6 to the inside of the drum, and while being in contact with the contents inside the drum, the cooling air is guided to the hood 5 and is sent to an incinerator (not shown). Drum body 2
Is supported by the receiving roller 10 at a position inclined from the inlet of the incineration to the outlet, preferably about 8 °.

The length of the scraping blade 9 is preferably 1/5 to 1/20 of the diameter of the drum. It is preferable that several blades, preferably 4 to 12 blades are provided on the inner surface of the rotary drum body 2 at substantially equal intervals. The wings may be fixed to the drum body, or the roots of the wings may be freely installed in the contents of the drum body.

(Effect of the present invention) According to the present invention, the high temperature sludge sludge and the like after incineration are sprinkled on the entire inner surface by the scooping blades on the inner surface of the cooling drum, and pass through the inside of the drum while making large contact with the cooling air. At that time, if the wall surface comes into contact with the wall surface, cooling can be further promoted by the cold water double jacket in the wall surface. After that, the sludge and the like fall onto the conveyor and are accumulated in the light silo.

The present invention has extremely good cooling efficiency because it performs combined cooling of water and air as a cooling device as described above, and downsizes the main body as compared with the conventional fixed vibration conveyor to reduce the installation area to 1/3 to 1/4. be able to.

In addition, there are no vibration parts, it rotates at low speed and there are few failures, dust,
It has features that work problems such as noise are solved and the environment is not deteriorated during operation.

Further, since a variable speed motor is installed as power for rotating the cooling drum main body, it is possible to adjust the operating condition by changing the rotational speed of the main body in response to the change in the incinerated material throughput.

The capacity of the main body rotation motor is 1/2 or less of that of the conventional vibration type motor, and the forced ventilation of the cooling air is to connect the intake port of the blown air of the incinerator and the exhaust side hood of the drum cooling device. This is very advantageous because it saves energy because heat is exchanged without requiring a blower.

The rotating drum type cooling device according to the present invention can be used as a post-incineration treatment of sludge sludge in the wastewater treatment of the paper mill. A high-temperature treated material in external heating / incineration such as chemical fertilizer, cast sand after metal casting, dust incinerated ash, etc. It can be widely used for the treatment of

Comparative Example A case in which slag incineration ash of clarifier is packed in kraft paper as wastewater treatment equipment at a paper mill.

Processing amount Powder 50m ³ / day Content temperature Cooling device inlet 900 ℃, outlet 60 ℃

[Brief description of drawings]

FIG. 1 is a side view of a rotary drum type cooling device of the present invention, and FIG.
The figure is the same cross-sectional view, FIG. 3 is a cross-sectional view when the contents are cooled by the device, FIG. 4 is a side view of a conventional vibration conveyor water-cooling type cooling device, and FIG. 5 is cooling in a device without blades. FIG. 6 is a cross-sectional view showing the state of FIG. 6 in the case where the contents are cooled using a drum having a wing whose tip is not bent. 1 ... Inlet chute, 2 ... Drum body, 3,4 ... Cold water jacket, 5,6 ... Cooling air hood, 7,8 ... Cooling water rotary joint, 9 ... Scoking blade, 10 ... … Receiving roller.

Claims (1)

[Claims] 1. A rotary drum type cooling device for introducing a heat-treated product from one side of an inclined rotary drum and discharging it from the other side, and cooling the heat-treated substance to a certain temperature or lower during the period, the inner surface of the rotary drum. A plurality of scraping blades are arranged in the longitudinal direction of the rotary blade, and the radially inner tip portions of these scraping blades are bent toward the rotating direction of the rotating drum, and the cylindrical portion that constitutes the rotating drum. And a mechanism for allowing cooling water to pass therethrough, and further having a mechanism for forcibly venting cooling air in a direction opposite to the traveling direction of the heat-treated product. .