JP3522083B2 - Method and apparatus for controlling rotary kiln incinerator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary kiln type incinerator control method and apparatus.

[0002]

2. Description of the Related Art An incinerator equipped with a rotary kiln is known as a refuse incinerator. As an example of this kind of incineration, as shown in FIG. 2, a rotary kiln incinerator 4 is known in which a dust inlet 1 is provided at one end of a rotary kiln 2 and a stoker oven 3 is provided at the other end of the kiln 2.

That is, in the incinerator 4, the processed material charged into the rotary kiln 2 from the charging port 1 is rolled or slid in the furnace by the rotation of the kiln itself. On the other hand, since the rotary kiln 2 is installed with an inclination such that the outlet side is slightly lowered, the rotary motion thereof causes the processed material to be gradually conveyed from the input port 1 to the outlet side 2A and reacts with the combustion air in the meantime to be incinerated. To be done.

Therefore, in the above rotary kiln type incinerator, the number of rotations is manipulated so that the residence time in the kiln is controlled by operating the rotation speed so that the treatment material burns out by the end of the kiln 2 according to the burning speed of the treatment object. Since it is adjusted, and after-burning is finally performed in the stoker furnace 3, it is possible to perform treatment with extremely high incineration.

As described above, since the incinerator 4 is constructed so that the characteristics of the kiln 2 and the stoker furnace can be exhibited, infectious medical waste, waste plastic, waste oil, waste liquid, sludge, etc. It has the advantage that most industrial waste can be treated.

[0006]

However, the residence time of the treated material in the kiln is more affected by the frictional condition of the kiln surface caused by clinker adhesion than the manipulated variable of the rotational speed of the rotary kiln.

Therefore, when the rotary kiln is continuously operated for a long period of time, such as several tens of days, the processed material gradually becomes hard to flow due to the clinker adhesion, and the feeding performance gradually decreases.

In order to prevent the deterioration of the feeding performance, an operation of increasing the rotation speed of the kiln has been conventionally performed.
The range of the upper and lower limits of the number of revolutions is predetermined, so if the feed performance of the processed material falls below a certain standard, the operation of the furnace must be stopped at that point to remove the clinker in the kiln. .

Therefore, the incinerator equipped with the rotary kiln has a drawback that the number of continuous operating days is shorter than that of other incinerators such as a stoker furnace and a fluidized bed furnace. On the other hand, in order to perform the clinker removal work, it is necessary to lower the temperature of the furnace to a safe temperature, and it usually takes 2 to 3 days as a cooling time, and since the removal work is performed after that, there is a problem that the incineration process is completely delayed during that time. there were.

The present invention has been made for the purpose of solving the above problems, and it is possible to maintain the feed rate of the incinerated material at a certain level or higher even if clinker is generated or grown, and continuously operate for a long time. The object of the present invention is to obtain a method and an apparatus for controlling a rotary kiln incinerator that enables the above.

[0011]

According to a first aspect of the present invention, there is provided a rotary kiln-type incinerator control method, wherein in an incinerator having a rotary kiln, the height of the outlet of the rotary kiln is gradually lowered as the continuous processing time elapses. It is characterized by increasing the descending inclination from the to the exit.

Therefore, even if the number of rotations of the kiln reaches the upper limit, the descending inclination maintains the feeding performance of the incinerated matter, so that the combustion can be continued even if the clinker is accumulated. The control device for a rotary kiln type incinerator according to claim 2, wherein in a incinerator including a rotary kiln, a pedestal that rotatably supports the rotary kiln is supported rotatably around a horizontal axis with an end on the inlet side of the rotary kiln as a fulcrum. Further, a drive device for supporting the gantry so as to be movable up and down is provided at a bottom end portion of the gantry on the outlet side, which is less affected by heat in the furnace.

This device is a device for carrying out the method according to the first aspect of the present invention, in which the tilt angle of the rotary kiln is adjustable.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described. FIG. 1 is a side view of an incinerator equipped with a rotary kiln.

In FIG. 1, 1 is a dust input port and 2 is a rotary kiln. In this refuse incinerator 4, a stoker furnace 3 is connected to a rotary kiln 2, and an ash classifier 3A is provided at the ash outlet of the stoker furnace 3.

The pedestal 5 for rotatably supporting the rotary kiln 2 is rotatably supported around the horizontal axis (paper spine direction in the figure) with the end on the inlet side of the rotary kiln as a fulcrum 5A, and the exit of the gantry 5 A drive device 6 for supporting the gantry 5 so as to be movable up and down as shown by an arrow P is provided at a side end bottom portion 5B where heat is less affected by the furnaces 2 and 3.

As the drive device 6, a hydraulic device composed of a cylinder piston as shown in the drawing, and a link device composed of a lever or a rack and pinion are used. Further, in the figure, 5C indicates a drive roll for rotatably supporting the rotary kiln 2 or an idling support roll.

Next, the control method will be described. If the incinerator is charged into the rotary kiln 2 from the charging port 1, it is rolled or slid in the furnace by the rotation of the kiln itself as described above, and is gradually conveyed from the charging port 1 to the outlet side 2A by the inclination, while Is incinerated by reacting with combustion air.

When a clinker is generated and accumulated due to continuous incineration for a long time, and the feed rate of the processed material is reduced accordingly, the rotation speed of the rotary kiln 2 is initially increased to compensate the feed speed, but the increase in the rotation speed is the upper limit. When it becomes impossible to adjust the rotation speed, the driving device 6 is driven to increase the inclination angle of the rotary kiln 2.

Therefore, the feed rate is maintained by the increase in the inclination angle, and the operation can be continued. Although the case where the tilt angle is adjusted after adjusting the rotation speed has been described above, the rotation speed and the tilt angle may be adjusted in parallel at the same time, and the rotation speed may be adjusted after the tilt angle is adjusted. May be adjusted.

[0021]

As described above, according to the method of the present invention, when incinerating an object to be processed in the rotary kiln, the decrease in the feed rate due to the occurrence of clinker is caused by the increase in the tilt angle of the rotary kiln in addition to the increase in the rotation speed. Since the amount of clinker can be adjusted, combustion can be continued as it is even if the amount of clinker accumulated exceeds the conventional amount, and continuous treatment for a long period of time can be performed.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing a conventional example.

[Explanation of symbols]

1 ... garbage input port 2 ... Rotary kiln 3 ... stoker furnace 3A ... ash classifier 4 ... Rotary kiln incinerator 5 ... Frame 5A ... fulcrum 6 ... Drive device

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Claims (2)

(57) [Claims] 1. An incinerator equipped with a rotary kiln, characterized in that the height of the outlet of the rotary kiln is gradually lowered as the continuous processing time elapses, and the descending inclination from the inlet to the outlet is increased. Control method of rotary kiln type incinerator. 2. In an incinerator having a rotary kiln, a pedestal for rotatably supporting the rotary kiln is rotatably supported around a horizontal axis with an end on the inlet side of the rotary kiln as a fulcrum, and an end on the outlet side of the gantry. A control device for a rotary kiln type incinerator, which is provided with a drive device that supports the pedestal so as to be movable up and down, at the bottom of the furnace where there is little heat effect.