JPS5844317Y2 - heating rotary furnace - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a heating rotary furnace for causing a desired chemical reaction or drying or incineration of an object by heating the object.

Conventionally, this type of rotary furnace was equipped with an internal reverse feed device inside the rotary body in order to prevent adverse effects such as a decrease in heat conduction caused by highly viscous processed materials adhering to the wall of the cylindrical rotary body. Things are known.

This reverse feeding device transports the processed material, which has been heat-treated in the rotating body to reduce its viscosity and become powder or granules, to the inlet side of the rotating body, and feeds the processed material from the outside into the rotating body. It is mixed with the unheated processed material to reduce the viscosity of the unheated processed material and prevent the processed material from adhering to the inner surface of the rotating body as much as possible.

However, despite the above-mentioned innovations, conventional rotary furnaces have
It had the following drawbacks.

That is, the unheated workpiece sent into the rotating body and the workpiece that is being heated and sent back fall separately onto the inner surface of the rotating body, and while moving forward inside the rotating body, Since they were mixed together, sufficient mixing of the two was not achieved unless the two were moved a predetermined distance within the rotating body.

Therefore, there is a drawback that it is not possible to prevent the object to be treated from adhering to the inner surface near the inlet of the rotating body as intended.

The purpose of this invention is to provide a heating rotary furnace that can solve the above-mentioned drawbacks and improve reaction efficiency and treatment efficiency.

This invention will be explained below based on embodiments shown in the drawings.

In this specification, the front refers to the right side in FIG. 1, and the rear refers to the left side in the same figure.

As shown in FIG. 1, a cylindrical rotating body 2 is rotatably fitted into a combustion furnace 1 with its axis slanting forward and downward, and the total length of the rotating body 2 is the length shown in the figure. Its front and rear parts protrude slightly from the combustion furnace 1 in the front-rear direction, and there is also a front head plate (not shown) at the front end that has a discharge port for the processed material. On the other hand, a rear end mirror plate 4 having a large through hole 3 is attached to the rear end.

The rotating body 2 is inserted into the through hole 3 with its front end fitted into the through hole 3.
A fixed jacket 6 having a heating gas outlet 5 therein is provided, and a workpiece supply cylinder 7 extending through the fixed jacket 6 and protruding into the rotating body 2 is provided on the rear wall of the fixed jacket 6. A screw conveyor 8 is housed within the supply cylinder 7 for accurately feeding a highly viscous workpiece into the rotating body 2.

An annular weir 9 is provided at the center of the rotary body 2 in the front-rear direction for storing the object to be processed in the rear half 2a of the rotary body 2. An internal reversing device 10 is provided within 2a.

The reverse feed tube 11 of the reverse feed device 10 is fixed to the rotating body 2 via a required number of support rods 12 so that its axis coincides with the axis of the rotating body 2. Inside the tube 11,
One or more threads of a reverse feed screw conveyor 13 are fixed, and as the rotating body 2 rotates clockwise in FIG. This is for transporting the processed material back.

A conical wall 15 having an opening 14 is fixed to the inlet end (front end) of the reverse feed cylinder 11, and a scooping duct 16 is provided around the periphery of the opening 14 of the iron wall 15, as shown in FIG. The distal end thereof is fixed to the rotating body 2.

The scooping duct 16 is connected to the rotating body 2 as shown in FIG.
A scooping opening 17 is provided on the wall facing forward in the rotational direction, and the scooping opening 17 is inclined toward the rotational direction so that the object to be processed can smoothly enter the scooping opening 17.

At the outlet end (rear end) of the reverse feed tube 11, a light spreading trumpet-shaped mixing tube 18 is provided to surround the supply tube 7, and at the boundary between the mixing tube 18 and the reverse feed tube 11, A stepped portion 19 is formed.

The degree of tapered expansion, length, etc. of the mixing cylinder 18 depends on the viscosity of the material to be processed, the inclination angle of the axis of the rotating body 2, and the rotating body 2.
In short, the adjustment is made by taking into consideration the rotational speed of the mixing cylinder 18, etc., so that the unheated workpiece and the workpiece that is undergoing heat treatment can remain in the mixing cylinder 18 for a sufficient time to be mixed and stirred. Ru.

In this embodiment, the outer diameter of the outlet end of the mixing cylinder 18 is increased to bring it as close to the rotating body 2 as possible, so that the problem occurs when the material to be processed falls from the mixing cylinder 18 onto the inner surface of the rotating body 2. Scattered dust is minimized to reduce the amount of dust mixed into the heated gas.

The operation of the rotary furnace will be explained below.

From the start of operation until the steady state of operation is reached, the condition inside the rotating body 2 is determined, for example, if the object to be processed remains in the rotating body 2 when the operation was stopped, or if the inside of the rotating body 2 is completely empty. Depending on the situation, the powder with low viscosity or the granulated material to be processed is transferred to the rotary body 2 by the screw conveyor 8 or by a separate conveyor with a high supply capacity after extracting the conveyor 8.
supply within.

After such a transient operation reaches a steady state of operation, when a highly viscous material is fed to the screw conveyor 8, unheated material flows from the front end of the supply tube 7 protruding into the rotating body 2. The processed material falls into the mixing cylinder 18.

However, the lower inner surface of the mixing cylinder 18 is coated with the processed material that has been sent back, that is, the processed material that has already been heat-treated and whose viscosity has decreased, such as powder or granules. , the unheated material to be processed falls onto it and rarely adheres to the inner surface of the mixing cylinder 18.

Therefore, the processed material that has been sent back and the unheated processed material are
As the trumpet-shaped mixing cylinder 18 rotates, that is, as the rotating body 2 rotates, the inner surface of the mixing cylinder 18 moves backward while being mixed, and falls onto the inner surface of the rotating body 2 in a sufficiently mixed state. .

The object to be processed that has fallen onto the inner surface of the rotating body 2 is hardly attached to the inner surface, so the rotating body 2
As it rotates, it smoothly moves forward without adhering to its inner surface, thus efficiently absorbing heat from the combustion furnace 1.

Then, as shown in FIG. 2, a part of the material to be treated that has advanced close to the position of the annular weir 9 passes through the scooping opening 17, the scooping duct 16, and the conical wall 15 as the rotating body 2 rotates. , is fed into the reverse feed cylinder 11, and is fed back to the mixing cylinder 18 by the action of the reverse screw conveyor 13.

The object to be processed that has been sent back falls onto the inner surface of the rotating body 2 again as described above.

On the other hand, the remainder of the material to be treated passes further forward beyond the annular weir 9, is heated, reaches the front end of the rotating body 2, and is discharged from the rotating body 2 by a predetermined means.

In a steady state of operation, the above actions are repeated continuously.

Although the operation is only stopped once or twice a year, in that case, after stopping the supply of the material to be processed by the screw conveyor 8, the operation of the rotary furnace is continued for a predetermined period of time and then stopped. Then, the object to be processed inside the rotating body 2 is discharged from the rotating body 2 by a predetermined means.

As is clear from the above explanation, the rotary furnace of this invention not only prevents the objects to be treated from adhering to the inner surface of the rotating body 2, but also improves processing efficiency and reaction efficiency by circulating the objects. Of course, the material to be treated is not limited to highly viscous materials.

Further, the number of scooping ducts 16 is - arbitrary.

Based on the above, according to this invention, a light spreading trumpet-shaped mixing cylinder is provided at the outlet end of the reverse transport cylinder of the internal reverse transport device so as to surround the processing material supply cylinder protruding into the rotating body. However, in the mixing cylinder, the unheated processed material and the heated powdered or granulated processed material are sufficiently mixed and stirred, that is, the viscosity is reduced. Since the material falls onto the inner surface of the rotating body, the amount of material to be treated that adheres to the inner surface of the rotating body can be extremely reduced compared to conventional rotary furnaces.

Further, since the unheated material to be processed falls onto the heat-treated material on the inner surface of the mixing cylinder, the material to be processed hardly adheres to the inner surface of the mixing cylinder.

Furthermore, since the material to be treated and the heated material to be treated are premixed in the mixing cylinder and then supplied into the rotating body, the processing efficiency and reaction efficiency in the rotating body can be improved.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, in which FIG. 1 is a vertical cross-sectional view of a main part, and FIG. 2 is a cross-sectional view taken along the line II--II in FIG. 1. 2... Cylindrical rotating body, 7... Processed material supply cylinder, 10... Internal reverse feed device, 11...
・Reverse feed cylinder, 18...Mixing cylinder.

Claims (1)

[Scope of utility model registration request] At the artificial end of the cylindrical rotating body, a to-be-processed material supply tube is provided to protrude into the rotating body, and at the outlet end of the reverse feeding tube of the internal reverse feeding device within the rotating body, a light spreading trumpet-shaped tube is provided. A heating rotary furnace characterized in that a mixing cylinder is provided to surround the supply cylinder.