JPS5818638Y2 - rotary furnace - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rotary furnace such as a rotary kiln for sludge incineration, and particularly to a rotary furnace equipped with an improved airtight mechanism.

A rotary furnace such as a rotary kiln used to incinerate sludge and the like generated when treating sewage, industrial wastewater, etc. generally has a configuration as shown in FIG.

That is, in FIG. 1, a kiln main body 1 is arranged at an angle between a furnace front hood 2 and a furnace bottom hood 3 fixed on a foundation, and has a drive device 5 in the middle part. It is rotatably placed on a plurality of rollers 6 provided on the foundation.

The furnace front hood 2 is equipped with a burner 4 facing into the kiln main body 1, and the furnace tail hood 3 is equipped with a charging lower opening into the kiln main body 1.

In the rotary furnace configured in this way, the material to be incinerated such as sludge is charged from the charging lower of the bottom hood 3, and when the kiln main body 1 is rotated on the rollers 6 by the drive device 5, the charged material is The incinerated material is sent to the front hood 2 side while repeating a circular agitation motion having an arcuate trajectory along the inner surface of the kiln body 1, and is dried and incinerated by the burner 4.

By the way, when burning the material to be incinerated within the rotary kiln main body 1, there are cases where the kiln main body 1 is operated with the pressure within the kiln main body 1 slightly higher than the external pressure.

When operating a rotary furnace under such conditions, prevent dust from being ejected to the outside from the seal portions 8 a and 8 b between the kiln body 1 and the front hood 2 or bottom hood 3. We must avoid causing secondary pollution.

For this reason, various types of airtight mechanisms have been employed heretofore.

FIG. 2 shows an example of such a conventional airtight mechanism, which includes a mechanism in which a bracket 9 is fixed to the furnace hood 2 and a ring 10 is fitted between the bracket 9 and the kiln body 1. It is something that

However, this conventional airtight mechanism still has a drawback that the sealing effect is not perfect because there are some gaps, and dust can leak out of the rotary furnace through these gaps.

The object of the present invention is to eliminate the above-mentioned drawbacks and to provide a rotary furnace equipped with an airtight mechanism that can reliably seal with a simple structure.

For this reason, in the present invention, a ring-shaped seal plate having an extension in the axial direction of the rotary furnace body is provided in the rotary furnace body, and the magnetic poles are opposed to each other across the extension of the ring-shaped seal plate. A yoke to which a permanent magnet is attached is provided in the fixed hood part, and magnetic powder is interposed between the magnetic poles, thereby eliminating gaps in the sealing part and providing a good magnetic seal. It is characterized by

The rotary furnace of the present invention will be explained below.

The structure of the rotary furnace according to the present invention includes its seal portion 8a,
The structure of the rotary furnace is exactly the same as that of the rotary furnace shown in FIG. 1 except for 8b.

The seal portions 8 a and 8 b are constructed as shown in FIG. 3.

That is, a ring-shaped seal plate 11 having an extension portion in the axial direction of the kiln main body 1 is provided on the outer periphery of the kiln main body 1.

This ring-shaped seal plate 11 may be made of either a magnetic material or a non-magnetic material.

A yoke 12 is provided in the front hood 2 and the bottom hood 3, sandwiching the extension of the ring-shaped seal plate 11, and this yoke has magnetic poles so that the lines of magnetic force are perpendicular to the extension of the seal plate 11. Permanent magnets 13a and 13b are attached so as to face each other.

The permanent magnets 13a and 13b are either integral ring-shaped as shown in FIG. 4, or a plurality of magnets arranged in a ring.

And a permanent magnet 13a. A magnetic powder 14 such as fine iron powder is interposed between the magnetic poles 13b.

In the rotary furnace according to the present invention configured in this way, when the kiln main body 1 is rotated, the extension of the seal plate 11 is inserted into the magnetic powder 14 interposed between the magnetic poles of the permanent magnets 13 a and 13 b. Rotate.

Since the permanent magnets 13a and 13b are arranged with their magnetic poles facing each other so that the lines of magnetic force are perpendicular to the extension of the seal plate 11, the magnetic powder 14 is distributed in the same manner as the lines of magnetic force.

Even if the distribution is disturbed by the rotation of the seal plate 11, the magnetic powder 14 always tries to return to the direction of the lines of magnetic force.

Therefore, the magnetic powder 14 is always interposed between the magnetic poles of the permanent magnets 13a and 13b, eliminating the gap in the sealing part.
A good magnetic seal can be obtained.

Furthermore, since the seal plate 11 has an extension extending in the axial direction of the kiln body 1, even if the kiln body 1 undergoes thermal expansion in the axial direction due to heating by the burner 4, the extension remains unchanged. It is possible to maintain a state of rotation within the magnetic powder interposed between the magnetic poles, and as a result, the axial thermal expansion of the kiln body 1 can be absorbed and the magnetic sealing effect can be further improved.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a rotary furnace, Fig. 2 is a sectional view of a main part showing a conventional example of its airtight mechanism, Fig. 3 is a sectional view of a main part showing an airtight mechanism of a rotary furnace according to the present invention, and Fig. 4. FIG. 2 is a side view showing the shape of a permanent magnet used in the airtight mechanism. 1: Kiln body, 2, 3: Fixed hood part, 8a, 8b:
Airtight mechanism, 11: Ring-shaped seal plate, 12: Yoke, 1
3a, 13b: Permanent magnet, 14: Magnetic powder.

Claims (1)

[Claims for Utility Model Registration] (1) In a rotary furnace in which a rotating kiln body is disposed in a fixed hood, a ring-shaped sealing plate having an extension in the axial direction of the kiln body is provided on the outer periphery of the kiln body. Further, a yoke to which permanent magnets are attached is provided in the fixed hood part so that the magnetic poles face each other across the extension of the ring-shaped seal plate, and magnetic powder is interposed between the magnetic poles. rotary furnace. 2. The rotary furnace according to claim 1, wherein a permanent magnet is attached so that the lines of magnetic force are perpendicular to the extension of the ring-shaped seal plate. 3. The rotary furnace according to claim 1 or 2, wherein the permanent magnet is in the form of an integral ring. 4. The rotary furnace according to claim 1 or 2, wherein the permanent magnet is in the form of a plurality of arcuate magnets connected in a ring shape.