JP3229064B2 - Method and apparatus for adding anti-fusing material to artificial lightweight aggregate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for adding an anti-fusing material for preventing fusion during the sintering of a lightweight aggregate.

[0002]

2. Description of the Related Art Conventionally, when manufacturing artificial lightweight aggregate,
Generally, expansive shale, clay, coal ash, and the like are granulated and fired in a kiln-like rotary kiln to reduce foaming and weight.

[0003]

However, such a sintering method is extremely difficult in practice. In order to sinter a commercially available lightweight aggregate, the sintering is performed until the surface of the particles is in a molten state at the time of foaming and lightening. It is necessary to raise the temperature, but it is necessary to prevent this fusing because the particles fuse together and clump or become columnar.

[0004] In order to prevent such fusing, there is a case where some defective products are prepared by operating operation. However, in general, alumina-based and silica-based materials having high melting points are used. It is necessary to effectively feed and add a fusion preventing material made of powder to the fusion joint.

As a method of adding the anti-fusing material, there are a method of adding the anti-fusing material together with the raw materials from the kiln tail and a method of adding the anti-fusing material from the burner side. Sometimes there is a problem that the anti-fusing material scatters from the rotary kiln together with the exhaust gas and scatters out of the system, especially if the particle size of the anti-fusing material is small, most of the material comes out of the system.
Not an efficient way. On the other hand, there is a method of mechanically charging the anti-fusing material from the burner side of the rotary kiln using the principle of a screw conveyor in order to prevent scattering.

A method of mechanically feeding such an anti-fusing material into the burning point from the burner blowing side is carried out by, for example, carrying the anti-fusing material to the burning point by a screw conveyor and preventing the adhesion at the burning point. Since the material is put in, the anti-fusing material can be put into the predetermined position efficiently, but the equipment becomes large, and especially the cooling device etc. to secure the heat resistance becomes large, and the equipment is dangerous. It becomes extremely difficult.

There is also a method in which an anti-fusing material is introduced from the burner side of the rotary kiln by an air pressure feeding method. The anti-fusing material is injected into a high-pressure air stream by continuously blowing powder, or For example, there is a method of intermittently charging the anti-fusing material into a lump. However, the former method is not preferable in terms of stable operation in the rotary kiln because the amount of air blown increases because the powder concentration is extremely low. In addition, the latter method of intermittent charging is inadequate in terms of coping with changes in the system since the charging of the anti-fusing material is performed intermittently. In other words, there is a problem that when the lumps become large due to the melt in the rotary kiln, they cannot be quickly eliminated.

Accordingly, an object of the present invention is to provide a method and apparatus for stably and efficiently adding an anti-fusing material to a hot spot in order to solve such various conventional problems. .

[0009]

According to the present invention, there is provided a method for adding an anti-fusing material for an artificial lightweight aggregate in a rotary kiln such as a rotary kiln. During the baking of the material, air is mixed with the anti-fusing material and fluidized to effectively add the anti-fusing material to the vicinity of the burning point in the rotary kiln. In a lightly filled state, that is, a bulk density of 15% or more of the bulk density of the anti-fusing material in a state of being filled in a container or the like without performing consolidation or the like, that is, in a state of a relatively high concentration, the supply pipe is connected. It is characterized in that it is continuously supplied into the rotary kiln from the kiln burner side through the kiln.

Further, according to the present invention, the apparatus for adding an anti-fusing material to an artificial lightweight aggregate is characterized in that when the artificial lightweight aggregate is baked in a rotary kiln, A fluidization box for mixing and fluidizing air with the anti-fusing material, an extruding device for extruding a mixed fluid of the anti-fusing material and air from the fluidizing box, And a supply pipe for supplying the mixed fluid extruded from the kiln burner side into the rotary kiln.

Further, according to the present invention, in the above-described apparatus for adding a fusion preventing material for artificial lightweight aggregate, an air blowing pipe for adjusting the supply position of the mixed fluid is connected near the tip of the supply pipe. It is characterized by doing.

Accordingly, the present invention provides the following
In order to supply the anti-fusing material near the burning point in a rotary kiln such as a rotary kiln, the flow pump device connected to the anti-fusing material supply pipe extending through the burner side wall of the rotary kiln In the fluidization box, fluidized air from the pressurized air source and the anti-fusing material are mixed and fluidized to form a relatively high-concentration mixed fluid. The powder of the anti-fusing material fluidized into the supply pipe is extruded by the mechanical extruder, and the anti-fusing material is transported by this. And throw it in.

At the time of charging, a small amount of pressurized air is blown into the supply pipe from an air blowing pipe connected near the tip of the supply pipe, and the anti-fusing material is charged to a desired position near the burning point in the rotary kiln. I can do it. At this time, the mixed fluid of the anti-fusing material and the air discharged from the supply pipe is drawn in a parabolic shape like water discharged from the hose.

[0014] Other objects, features and advantages of the present invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings.

[0015]

FIG. 1 shows an example of an apparatus for adding an anti-fusing material for carrying out the method of adding an anti-fusing material for artificial lightweight aggregates according to the present invention. In a rotary kiln 1 such as a rotary kiln, a burner 3 of the rotary kiln 1 is supplied so as to supply an anti-fusing material to the vicinity of a burning part 2 in the rotary kiln 1.
An anti-fusing material supply pipe 4 extends through the side wall into the rotary kiln 1, and is water-cooled around the tip of the supply pipe 4 so as to prevent overheating of the tip of the supply pipe 4. Alternatively, a cooling jacket 5 for cooling by air cooling is provided.
Further, an air blowing pipe 6 for supplying pressurized air is connected near the tip of the supply pipe 4 for the anti-fusing material.
A flow pump device 7 for fluidizing and pressure-feeding the anti-fusing material A is connected to the supply pipe 4 for the anti-fusing material. That is, the flow pump device 7 includes an extrusion device such as an extrusion screw for mechanically extruding the fluidized anti-fusing material A, and an appropriate fluidized air source through a small number of small holes. (Not shown), and a fluidizing box 9 provided with a hopper 10 containing an anti-fusing material at the top. Accordingly, the anti-fusing material A enters the fluidizing box 9 from the upper hopper 10 and mixes with the fluidizing air from the pressure air source from below in the fluidizing box 9 to flow at a relatively high concentration. The mixed fluid B of the anti-fusing material A and air is conveyed in the supply pipe 4 by an extruder 8 such as an extruder screw. The mixed fluid B containing the anti-fusing material A, which has been carried in the supply pipe 4, is introduced into the rotary kiln 1 from the tip of the supply pipe 4 in the vicinity of the burning part 2. At the time of injection, the air is blown in while maintaining a relatively high concentration by a small amount of pressurized air blown into the supply pipe 4 from an air blowing pipe 6 connected near the end of the supply pipe 4. By changing the pressure of the blown air, the blow-in position of the anti-fusing material A can be adjusted to a desired position and dropped. This high pressure air is preferably at a pressure in the range of about ^{2 to} 10 kg / cm ² .

As described above, the anti-fusing material A is supplied to the fluid pump device 7 at a relatively high concentration, preferably in a lightly filled state.
In other words, the mixed fluid B having a bulk density of 15% or more of the bulk density in the hopper 10 is continuously extruded in a fluidized state in the supply pipe 4 and transported to the tip, and is pressurized in the rotary kiln 1 by pressurized air. It is thrown into a predetermined position near the burning spot 2.

In the adding apparatus for carrying out the method for adding a fusion preventing material of the present invention thus constructed, first, the fusion preventing material A is supplied from the hopper 10 of the flow pump device 7 into the fluidizing box 9. When the silica powder is used as the anti-fusing material A in the fluidizing box 9 with air from a pressure air source, for example, the bulk density of the silica powder in a lightly packed state is 1200 to 1300 kg / m. 200 to 70 for ³
It is fluidized at a bulk density of 0 kg / m ³ , and is continuously extruded and transferred through the supply pipe 4 by the extruder 8. In this way, the fusion preventing material A extruded and transferred at a required density in the supply pipe 4.
Is injected into the rotary kiln 1 at a predetermined position in the vicinity of the burning point 2 by the pressurized air from the air blowing pipe 6 at the end of the supply pipe 4 and is mixed well with the granulated material, so that the fusion of the granulated material is preferable. Can be prevented.

[0018]

As described above, according to the method for adding the anti-fusing material of the artificial lightweight aggregate according to the present invention, the anti-fusing material is made to flow by the fluidizing air in the fluidizing box of the fluid pump device. It can be mixed and fluidized, continuously supplied, and introduced into the vicinity of the burning point in the rotary kiln. At the time of injection, the injection can be performed by blowing air from an air blowing pipe connected near the tip of the supply pipe. At this time, by adjusting the pressure of the blowing air to adjust it, the anti-fusing material can be suitably used. The anti-fusing material can be effectively introduced into the position, and the anti-fusing material is transported with a high dust concentration until immediately before loading, so that the transfer process is stable and the anti-fusing material can be prevented from scattering and supplied. Since the tube is small, the cooling device can be easily processed and the heat resistance can be improved, and the use of compressed air can be reduced, so that effects such as good thermal efficiency can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic view of an adding device for carrying out a method for adding a fusion preventing material for an artificial lightweight aggregate according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary kiln 2 Burning part 3 Burner 4 Supply pipe 5 Cooling jacket 6 Air blowing pipe 7 Flow pump device 8 Extrusion device 9 Fluidization box 10 Hopper A Anti-fusing material B Mixed fluid

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tadashi Sueoka 6276 Onoda, Onoda-shi, Yamaguchi Prefecture Onoda Cement Co., Ltd. Resource Chemistry Laboratory (72) Inventor Ikuo Saito 2-4-2-4 Osaku, Sakura City, Chiba Prefecture Inside the Central Research Laboratory, Onoda Cement Co., Ltd. (72) Koji Nitta Inventor 6276, Onoda, Onoda City, Yamaguchi Prefecture Onoda Cement Co., Ltd., Resource Chemistry Laboratory (72) Inventor Akio Shinozaki 1-2-2 Shibaura, Minato-ku, Tokyo No. 3 Inside Shimizu Corporation (58) Field surveyed (Int. Cl. ⁷ , DB name) C04B 14/02 C04B 20/06

Claims (3)

(57) [Claims] 1. A method for adding an anti-fusing material for artificial lightweight aggregate to effectively add an anti-fusing material to the vicinity of a burning point in a rotary kiln when firing artificial lightweight aggregate in a rotary kiln. Then, air is mixed with the anti-fusing material to make it fluid, and the mixed fluid of the anti-fusing material and air has a bulk density of 1 in the lightly filled state.
A method for adding an anti-fusing material for artificial lightweight aggregate, characterized in that a bulk density of 5% or more is continuously supplied from a kiln burner side to a rotary kiln via a supply pipe. 2. An apparatus for adding an anti-fusing material for artificial lightweight aggregate to effectively add an anti-fusing material near a burning point in a rotary kiln when firing artificial lightweight aggregate in a rotary kiln. A fluidizing box for mixing and fluidizing air with the anti-fusing material, an extruder for extruding a mixed fluid of the anti-fusing material and air from the fluidizing box, and an extruding device for extruding the fluid. A supply pipe for supplying the mixed fluid from the kiln burner side to the inside of the rotary kiln; 3. The apparatus according to claim 2, wherein an air blowing pipe for adjusting the supply position of the mixed fluid is connected near the tip of the supply pipe.