JPH0247439Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a rotary kiln with a cooling pipe.

(Prior art) For example, when a rotary kiln is used to heat-treat a powder or granule that is easily ignited at high temperatures in the air, the high-temperature powder or granule after the treatment is not immediately taken out to the outside, but is cooled to a certain extent, and then The rotary kiln, in which a spiral cooling pipe is connected to the outlet of the kiln body, is known as one of the devices used in such cases. In other words, in this device, the powder and granules exiting the kiln body are guided to the cooling pipe, but they move within the spiral pipe as the kiln rotates.
During this process, it is air cooled.

However, in such a rotary kiln equipped with a cooling pipe, when the amount of powder or granules to be processed is small, efficient cooling is expected with the cooling pipe, but when the amount of processed material is large, the cooling The powder and granules that remain in the pipes are not mixed and their surfaces are not renewed, which not only makes it impossible to cool them efficiently, but also causes heat to build up inside the powder and, in some cases, cause ignition. Sometimes I do.

(Purpose of the invention) In view of the above-mentioned circumstances, an object of the present invention is to provide a rotary kiln that can effectively air-cool powder and granular material in a cooling pipe.

(Structure of the invention) To explain the invention in detail according to the drawings,
The figure is a schematic front view showing a rotary kiln with a cooling pipe as an example of the present invention, and FIG. 2 is a cross-sectional view showing a part of the cooling pipe in the apparatus shown in FIG. 3 is a powder supply port, 3 is a main body outlet, 4 is a cooling pipe, 5 is a powder discharge port, and 6 is a bulging portion.

In the apparatus of the present invention, a spiral cooling pipe 4 is connected to the outlet 3 of the rotary kiln main body 1. The cooling pipes 4 are provided at intervals around the outer periphery of the kiln body 1, and are normally provided so that the granular material moves toward the upstream side of the kiln. Therefore, the powder is supplied into the kiln main body 1 from the powder supply port 2, moves inside the kiln while being heat-treated, and then passes through the main body outlet 3 to the cooling pipe 4.
The powder is guided into the pipe, moves within the pipe while being air-cooled in accordance with the rotation of the kiln main body 1, and is finally discharged from the powder discharge port 5. The diameter and length of the cooling pipe in this device are appropriately selected and are not particularly limited.

In the present invention, a bulging portion 6 is provided at at least one location on the cooling pipe 4, and the inside of the bulging portion 6 is divided into a plurality of portions by a partition plate 7.

In other words, the granular material transferred into the cooling pipe 4 is mixed in the bulging portion 6. Therefore, this bulging portion 6 is provided at an appropriate position in the middle of the cooling pipe 4, but usually,
It is effective to provide the cooling pipe 4 at a position within the range of 1/3 to 2/3 of the total length.

Although the shape of the bulging portion 6 may be arbitrary, it is usually preferable to cut out a part of the outer circumferential surface of the cooling pipe, cover it with a box having a corresponding open plane, and fix this by welding. It is easy and preferable to manufacture. Furthermore, the partition plate 7 is installed approximately at right angles to the rotation direction of the pipe, and as the pipe rotates, the powder and granules sequentially move from the upper space over the partition plate 7 to the lower space. It is set up like this. One or more partition plates 7 are provided within the bulge 6 .
The size of the bulging portion 6 is usually about 0.5 to 3 times the diameter of the cooling pipe 4, and the length is usually 1/20 to 1/3 of the circumference of the cooling pipe 4. That's about it. Further, it is generally desirable that the height of the partition plate 7 be within a zone that bulges out from the pipe.

Furthermore, in the present invention, by providing a viewing window 8 made of a transparent material such as glass on the wall surface of the bulge 6, it is possible to observe the state of the powder and granular material inside the bulge 8 from the outside during operation. It is desirable because it allows

(Effects of the invention) According to the device of the invention, even when flammable powders and granules are processed in a rotary kiln at high temperatures,
Since the powder and granules are mixed in the cooling pipe, no heat is trapped in the powder. Air cooling can be performed extremely efficiently. Therefore, the granular material can be cooled down to a desired temperature or lower at the discharge port, and the granular material will not catch fire.
Moreover, the device of the present invention is easy to manufacture and the manufacturing cost is low.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view showing a rotary kiln with a cooling pipe as an example of the present invention, and FIG. 2 is a cross-sectional view showing a part of the cooling pipe in the apparatus shown in FIG. 2 is a powder supply port, 3 is a main body outlet, 4 is a cooling pipe,
Reference numeral 5 indicates a powder discharge port, and reference numeral 6 indicates a bulging portion.

Claims (1)

[Scope of utility model registration request] In a rotary kiln that is connected to the outlet of the kiln body and discharges granular material through a cooling pipe provided spirally around the outer periphery of the kiln body, the internal granular material is discharged from the outer peripheral surface of the cooling pipe. A rotary kiln equipped with a cooling pipe, characterized in that at least one bulging portion for mixing is provided, and the inside of the bulging portion is divided into a plurality of portions by a partition plate.