JPS63176989A - Rotary kiln - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a rotary kiln.

More specifically, the present invention relates to a rotary kiln comprising a rotating cylindrical body portion whose inclination angle can be freely changed.

A rotary kiln is a device in which a material to be treated is put into a rotating cylinder slightly inclined with respect to the horizontal plane, and the material is subjected to high-temperature treatment using hot air or flame from one end or the middle of the cylinder. Rotary kilns generally have high processing temperatures, and in order to protect the rotating cylinder, the inner surface of the cylinder is lined with a refractory material. The feature is that the object to be treated is heat-treated using the thermal energy supplied while the process progresses. Further, rotary kilns are characterized by a relatively simple structure and continuous operation under predetermined and stable processing conditions.

Conventional technology Rotary kilns are widely used for heat treatment and thermal processing such as drying, combustion, incineration, and sintering, but their shape, speed,
They are classified into various types depending on the heating method, etc. Classified based on shape, there are single-barrel types, in which the cylindrical body is formed with the same diameter over almost the entire length of the kiln, double-barrel types, in which the cylinder bodies are formed with two or more different diameters, and double-barrel types, in which the single-barrel bodies are arranged in parallel. It can be divided into two-stage or multi-stage types connected by a hood.

An example of a conventional two-stage rotary kiln is shown in FIG.

This rotary kiln includes two fixed inclined rotary cylinders 1O arranged in parallel at predetermined inclination angles and connected by a connecting hood 16. The inclination angle of the rotating cylindrical body cannot be changed.

Regardless of whether it is a single-shell type, a multi-shell type, or a multi-stage type, a conventional rotary kiln has a fixed inclination angle. The processing speed of a rotary cleaner is determined by its rotational speed and inclination angle, assuming that the processing altitude is constant. Therefore, a conventional rotary kiln with a fixed inclination angle cannot process at an optimum processing speed when the type, nature, and quantity of the material to be processed changes. For example, the treatment efficiency of highly fluid liquids is low, and for materials to be treated that may damage all the refractories lining the cylinder, it is necessary to perform complicated pre-burying using a separate device.

In conventional rotary kilns, which have a fixed inclination angle and are continuous, when processing sludge waste containing waste acids, waste alkaline earth metal compounds, etc., the sludge sticks to the inner surface of the rotating cylinder or forms large beads. These wastes tend to form clumps, making heat treatment of these wastes extremely difficult. This type of processing material is a perfect alternative to a rotary kiln! It was necessary to either select all or install special pre-processing equipment.

Means for Solving the Problems The present invention has been made in view of the above-mentioned problems. At least two rotary fields will be installed in order to expand the range of applications of rotary kilns by taking advantage of their economical benefits, including ease of control and thermal efficiency, while also being able to process highly fluid liquids and substances that can damage refractories. It is an object of the present invention to provide a rotary kiln in which all cylinders are connected via a hood and the inclination angle of at least one of the rotating cylinders is variable.

The present invention relates to a rotary kiln characterized in that at least two rotating cylindrical bodies are connected via a hood, and the inclination angle of at least one of the rotating cylindrical bodies is variable. The processing speed of is determined by its rotation speed and inclination angle.

However, in conventional rotary kilns, processing of highly fluid substances is difficult to control with normal rotational speed and gradient chromaticity, and thermal efficiency is often significantly reduced, so other equipment is usually used. . Even in such a case, according to the rotary kiln of the present invention, which has excellent JIB response to load fluctuations, the shape of the variable tilt rotating cylinder is made into a hollow shape like a barrel, and the workpiece is maintained almost horizontally. If the material is sufficiently heat-treated and then transferred to the following fixed inclined rotary cylinder for treatment, the throughput per volume increases and high thermal efficiency is obtained. Damage caused by altitude changes and gravity of the object to be processed can be significantly reduced.

For materials to be treated that are highly corrosive to refractories, the variable tilt rotating cylinder should be kept nearly horizontal, an anti-erosion agent should be supplied in advance, the entire protective bath should be released, and the material to be treated should be placed there. The protective agent and the material to be treated can be supplied continuously to allow a sufficient reaction to occur at an appropriate temperature. In this case as well, by connecting a variable tilt rotating cylinder and a fixed tilt rotating cylinder with different control temperatures, a part of the high temperature gas can be used mutually.
Thermal efficiency can be significantly increased by supplying other waste.

Furthermore, by connecting the variable tilt rotary cylinder and the fixed tilt cylinder in series, and by supplying materials and adjusting the atmospheric gas at each connection, reactions such as oxidation and oxygenation can be carried out efficiently depending on the reaction rate. It can be progressed well and freely.

Embodiment FIG. 2 shows a side view of a rotary kiln according to the present invention. This rotary kill machine consists of a variable tilt rotary cylindrical body 20 whose tilt angle can be freely changed during operation, and a fixed tilt rotary cylinder 10 which is connected in series to the cylinder and whose tilt angle is fixed. Although not shown, a nozzle for supplying all materials, air, gas, etc. is installed at the joint between the variable tilt rotating cylinder 20 and the fixed tilt cylinder 10. 12 is a support device for the fixed inclined cylinder, 15 is a drive device, 14 is an exhaust port, and 15 is a gas seal hood. Reference numeral 21 denotes a supply port of the material to be treated, this part is provided with a gas feed burner (not shown), 22 is a support device for the variable tilt rotation cylinder 20, 25 is a drive device, 21
4 is a gas seal hood, and 25 is a hydraulic tilting device for tilting the variable tilt rotary cylindrical body 20. The ghost line in the figure indicates the tilt angle changing position of the variable tilt rotating cylinder.

FIG. 3 is a schematic diagram showing another embodiment of the present invention, in which the first variable inclination rotary cylindrical bodies 20 are connected in series.
and a second variable tilt rotating cylindrical body 20.

Experimental example The diameter of the trunk is 5m, the diameter of the discharge hole is 0.7m, and the length of the trunk is 12m.

Variable inclination angle 0-55 degrees, control rotation speed 1-llrpm,
Total length 5. gm variable tilt rotating cylinder 20, body diameter 15
Using a rotary kiln connected in series with 10 fixed inclined rotary cylinders with a rotation speed of 1 to 1 l rpm and a total length of 5 m,
The temperature of the variable tilt rotating cylinder 20 is maintained at 500° C., and after first heating the sludge containing iron oxide and aluminum oxide, the strong basic sludge containing a large amount of sodium salt and the sludge of iron oxide and aluminum oxide are heated. Mix and maintain the temperature 'f of the fixed tilt rotating cylinder 10 at 500° C., transfer the obtained mixture to the fixed tilt rotary cylinder 10 at 100 K9/
Balls to be processed with a diameter of 1 to 5 cIrL at a processing speed of hr
1000Kg? However, the rotary kiln operated smoothly and no damage to the refractory was observed.

Effects of the Invention According to the present invention, at least two rotating cylindrical bodies are connected through a hood, and the inclination angle of at least one of the rotating cylindrical bodies is made variable, thereby simplifying the structure of the rotary kiln and adapting it to load fluctuations. The application range of the rotary kiln can be expanded to the full extent by taking advantage of its economic efficiency, ease of temperature control, and thermal efficiency, while also being able to process highly fluid liquids and substances that may damage refractories. .

[Brief explanation of the drawings] Figure 1 is a side view of a conventional two-stage rotary kill/
The figure is a side view of a rotary kiln according to the present invention. FIG. 5 is a side view of a rotary kiln according to another embodiment of the present invention.

Claims (1)

Claims: 1. A rotary kiln, characterized in that at least two rotating cylindrical bodies are connected via a hood, and the inclination angle of at least one of the rotating cylindrical bodies is variable. 2. A patent characterized in that it consists of a first rotating cylindrical body 20 whose inclination angle can be freely changed, and a second rotating cylindrical body 10 connected to the first rotating cylindrical body and having a fixed inclination angle. A rotary kiln according to claim 1. 3. It consists of a first rotating cylindrical body 20 whose inclination angle can be freely changed, and a second rotating cylindrical body 20 which is connected to the first rotating cylindrical body and whose inclination angle can be freely changed. A rotary kiln as claimed in claim 1.