JPS5844948B2 - Internal backfeed device of heating rotary furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an internal reverse feed system in a heating rotary furnace for causing a desired chemical reaction or drying or incineration of a workpiece by heating the workpiece. Regarding equipment.

This type of internal refeeding device improves reaction efficiency and treatment efficiency by circulating the material to be treated inside the cylindrical rotating body, and also improves viscosity during heat treatment when the material to be treated is highly viscous. A processed material with reduced consistency, that is, a powdered or granulated material, is mixed with an unheated processed material to reduce the viscosity of the unheated processed material, so that the viscosity of the unheated processed material is reduced, and the result is that the inner surface of the cylindrical rotating body is This is to prevent it from adhering to the surface.

Various types of internal reverse transport devices are known, but none of them fail to reliably transport the workpiece during heat treatment, or This method has the disadvantage that the materials are not mixed and stirred sufficiently, and the desired effect cannot be achieved.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a new and useful internal reversing device which achieves its intended purpose much more effectively than conventional devices.

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

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

As shown in FIG. 1, a cylindrical rotating body 2 is rotatably fitted in a combustion furnace 1 with its axis slanting forward and downward. Furthermore, a front end head plate (shown in the figure) is attached to the front end of the plate, which slightly protrudes in the front and back direction, and has a discharge port for the processed material after processing has been completed, while a large through hole 3 is installed at the rear end of the front end. A rear end mirror plate 4 is attached.

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 heated gas discharge port 5 is provided on the rear wall of the fixed jacket 6, and a workpiece supply cylinder 7 extending through the fixed jacket 6 and protruding into the rotating body 2 is provided.
A screw conveyor 8 is housed within the supply cylinder 7 to accurately supply the object to be processed into the rotary body 2 .

An annular group 9 for storing the object to be processed in the rear half 2a of the rotor 2 is provided at the center in the longitudinal direction of the rotor 2, and a portion of the rotor 2 behind the annular group 9, that is, the rear half An internal reversing device 10 is provided within 2a.

Each of at least one, preferably 3 to 10 reverse feeding units 11 constituting the main part of the reverse feeding device 10 has a truncated conical side wall 12a with an inlet opening 13 at the end of the small diameter portion, and It has a main body 12 consisting of a short cylindrical circumferential wall 12b continuous to the end of the large diameter portion, and a closing plate 15 having an outlet opening 14 in the center is attached to the short cylindrical circumferential wall 12b. As clearly shown in FIG. 4, on the large diameter side of the main body 12, the heated object that has reached the short cylindrical peripheral wall 12b is scooped up as the unit body 11 rotates, and the outlet opening is opened. A scooping chamber 16 leading to the container 14 is provided.

The scooping chamber 16 includes a short cylindrical peripheral wall 12b and a closing plate 15.
and a scooping wall 17, and the scooping chamber 16 has a scooping opening 18 at the tip in the rotational direction of the unit body 11, and the outlet opening 14 is used as a discharge port. It is something to do.

The wall body 17 includes a deformed fan-shaped plate 17a provided to form a predetermined interval with the closure plate 15, and a deformed fan-shaped plate 1
It is constituted by an inclined side wall 17b that closes off the space between the side edge forming the scooping opening 18 of 7a and the side edge other than the arcuate edge fixed to the short cylindrical peripheral wall 12b and the closing plate 15.

The reverse feed units 11 having the above configuration are connected so that the axes thereof are common to each other and the inlet opening 13 of the rear unit is aligned with the outlet opening 14 of the front unit. The group of units 11 that are connected and integrated in this way are arranged so that their axes coincide with the axis of the rotating body 2 and the inlet openings 13 are directed toward the front of the rotating body 2. , is fixed in the rotating body 2 by a required number of support rods 19.

Note that the diffusion angle of the truncated conical side wall 12a of the unit body 11,
The length etc. are determined by taking into account the viscosity of the material to be treated, the inclination angle of the axis of the rotating body 2, the rotational speed of the rotating body 2, etc., and in short, the mixing rate and reaction efficiency of the heated material. Adjustment is determined so as to increase the

A tapered side wall 2 is provided at the front end of the most forward reverse feeding unit 11.
A cap 20 having 0a is fixed, and the cap 20
As shown in FIG. 2, there are partition plates 21 arranged in a three-pronged manner at an angle of 120° to each other, and an opening 22 is formed in each part of the side wall 20a defined by these partition plates 21. A scooping duct 23 is connected to each peripheral edge of the opening 22, and the tip thereof is fixed to the rotating body 2.

The scooping duct 23 has a scooping port 24 on the wall that is located at the front in the direction of rotation of the rotating body 2, and has a scooping port 24 facing toward the direction of rotation so that the material to be processed smoothly enters the scooping port 24. It is sloping.

Although the number of ducts 23 in this embodiment is three,
In this invention, the number of ducts 23 may be at least one.

Furthermore, in this specification, the term duct includes a gutter-like scooping means.

A light-spreading trumpet-shaped mixing cylinder 25 is attached to the periphery of the outlet opening 14 of the rearmost reverse feed unit 11 so as to surround the supply cylinder 7 .

The degree of expansion, length, etc. of the mixing cylinder 25 are set so that the unheated and heated objects can remain in the mixing cylinder 25 for a sufficient time to be mixed and stirred. Adjustment determined.

In this embodiment, the outer diameter of the outlet end of the mixing cylinder 25 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 25 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 apparatus will be described below, taking as an example a case where a highly viscous workpiece is treated.

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 is fed from the front end of the supply tube 7 protruding into the rotating body 2. The object to be processed falls into the mixing cylinder 25.

However, the lower inner surface of the mixing cylinder 25 is coated with the processed material that has been sent back, that is, the processed material that has already been heat-treated to reduce its viscosity and become powder or granules. The unheated material to be processed falls onto it and rarely adheres to the inner surface of the mixing cylinder 25.

Therefore, the processed material that has been sent back and the unheated processed material are
As the trumpet-shaped mixing cylinder 25 rotates, that is, as the rotating body 2 rotates, the inner surface of the mixing cylinder 25 moves backward while being mixed, and falls onto the inner surface of the rotating body 2 in a sufficiently mixed state. .

The objects to be treated that have fallen onto the inner surface of the rotor 2 hardly adhere to the inner surface, so as the rotor 2 rotates, the objects to be treated do not adhere to the inner surface and are therefore removed from the combustion furnace 1. It moves smoothly forward while absorbing heat efficiently.

Then, as shown in FIG. 2, a part of the object to be treated that has advanced close to the position of the annular salt 9 is transferred to the scooping port 24 and the scooping duct 1-23 as the rotating body 2 rotates counterclockwise. , cap 20 and inlet opening 13 into the unit 11 and is passed back along the frusto-conical side wall 12a.

The heated object to be processed is sufficiently stirred and mixed while sliding along the side wall 12a.

The workpiece that has reached the short cylindrical circumferential wall 12b is lifted up by the scooping port 18 of the scooping chamber 16 while the scooping port 18 of the scooping chamber 16 starts to rise from the lowest position due to the rotation of the unit body 11, that is, the rotating body 2. enters into the scooping chamber 16 from above, and as the unit body 2 further rotates, the outlet opening 1 opens along the inclined side wall 17b.
4 and enters the rear unit 11 through the outlet opening 14.

By repeating the above-described actions, the heated material to be processed is transported back to the mixing cylinder 25 and falls onto the inner surface of the rotating body 2 again as described above.

Note that the object to be treated is sufficiently heat-treated even in the above-mentioned reverse feeding process.

On the other hand, the remainder of the material to be treated passes through the annular salt 9, moves further forward, is subjected to X1 heat treatment, and reaches the front end of the rotating body 2.
It is discharged to the outside of 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. If necessary, 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 description, the reverse feeding device of the present invention not only prevents the objects to be processed from adhering to the inner surface of the rotating body 2, but also circulates the objects to be processed and improves processing efficiency and reaction efficiency. Since a trading company can also do this, the material to be treated is not limited to highly viscous materials.

As described above, according to the present invention, a heated workpiece is
Since it is slid down along the truncated conical side wall of the rotating reverse feeding unit and is reverse fed, the expansion angle of the truncated conical side wall can be adjusted depending on the type of workpiece. According to
Not only can the material to be processed be reliably transported back, but also the material to be processed can be sufficiently mixed and agitated within the reverse transport unit, and heat can be effectively absorbed, which improves reaction efficiency and processing. It can also increase efficiency.

Furthermore, by changing the number of connected reverse feed units, the reverse feed section can be lengthened or shortened, so it is extremely easy to create a reverse feed device having a desired reverse feed section length. And it can be obtained at low cost.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a longitudinal sectional view of the main part, Fig. 2 is a sectional view taken along the line ■-■ of Fig. 1, and Fig. 3 is a sectional view taken along the line ■-■ of Fig. 1. 4 are enlarged perspective views of portion A in FIG. 1. 2... Cylindrical rotating body, 10... Internal reverse feed device, 11... Reverse feed unit, 12...
Main body, 12a...Frustoconical side wall, 13...
...Inlet opening, 14...Outlet opening, 15...
...Closure plate, 16...Scooping chamber, 23.
...Scooping duct.

Claims (1)

[Claims] 1 Consisting of at least one scooping duct provided in the middle of the cylindrical rotating body of the heating rotary furnace, and at least one unit for reverse feeding provided following the duct, The unit includes a main body having a frusto-conical side wall and an inlet opening at the end of the small diameter part, a closing plate that closes most of the end of the large diameter part of the main body and has an outlet opening in the center, is provided on the main body side, and as the rotating body rotates, the heated workpiece that has reached the large diameter part of the main body from the scooping duct through the inlet opening is scooped up by further rotation of the rotating body. and a scooping chamber leading to the outlet opening.