JP2000351633A - Glass fiber waste recycling equipment - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To recover a glass component from waste glass fiber coated with an organic substance, it is possible to completely remove the organic substance, and to further remove the glass fiber in a state that does not contain the organic substance. Provided is a glass fiber waste material recycling apparatus capable of efficiently recycling glass fiber waste material by directly charging the glass material into a glass melting furnace. SOLUTION: Burner 3b provided in melting chamber 2 for melting glass raw material During the flame, glass fiber waste material coated with organic matter is dispersed and supplied together with the carrier gas.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for recycling glass fiber waste, and more particularly, to an apparatus for efficiently collecting and recycling glass in glass fiber waste such as glass wool.

[0002]

2. Description of the Related Art Glass fibers are continuously spun from a glass melting furnace and are used for plastic composite materials. Short fiber (commonly called glass wool), which is coated with an organic substance. Some of the waste materials generated in the manufacturing process are reused as building materials, but at present, most of the waste materials are landfilled as industrial waste at final disposal sites. However, with the recent shortage of final disposal sites, effective utilization of glass fiber waste materials has been desired. In addition, since the heat-insulating sound-absorbing material that is widely used for construction becomes a large amount of waste when the building is dismantled, its effective use is also required.

[0003] As one of effective methods of using such glass fiber waste materials, there has been proposed a method of burning and removing organic substances in a high-temperature furnace and recycling the recovered inorganic substances as raw materials for glass fibers. For example, JP-A-2-261589 discloses a method of melting glass fibers coated with an organic substance. In this method, waste is charged into a high-temperature furnace and oxygen or oxygen-enriched air is delivered to the boundary between the molten layer and the upper fibrous material, or is delivered from a nozzle at the bottom of the furnace. And the organic matter is burned to generate most of the heat required to melt the glass fiber, thereby rapidly melting the glass fiber. The molten glass fibers are removed from the high-temperature furnace and recovered after cooling.

Japanese Patent Application Laid-Open No. Hei 8-21764 discloses a melting furnace in which a raw material chamber and a nozzle chamber are separated by a partition plate, waste glass fiber is introduced into the raw material chamber, and the softening point of the glass is controlled by a burner. After burning the organic matter by heating below, it is moved to a nozzle chamber heated to 1100 ° C. or higher by a burner, where the glass fiber is completely melted and further quenched in water to obtain a glass fiber material. A method is disclosed.

Further, Japanese Unexamined Patent Publication No. 6-511422 discloses that a mineral fiber coated with an organic substance, that is, a glass fiber waste material is supplied to a refractory brick container, and molten glass pool is melted by Joule heating by an electrode, and the molten glass pool is stirred by a stirrer. A method of recovering mineral fibers by stirring is disclosed.

[0006] In these methods, the organic matter covering the glass fiber is separated and removed from the glass fiber by burning or heating. Such a method, when there is a sufficient temperature difference between the decomposition start temperature of the organic matter and the softening point of the glass fiber, it is possible to easily separate and remove both,
When the temperature difference is small, the decomposition of the organic substance and the melting of the glass fiber proceed simultaneously, so that the organic substance may be taken into the melt. In particular, in the case of glass wool for adiabatic sound absorbing material in which a phenol resin is coated on a glass fiber having a relatively low softening point, the decomposition starting temperature of the phenol resin and the softening point of the glass are close to each other, so that organic matter is contained in the melt. Easy to be imported. It is said that the inorganic substance recovered in a state in which organic substances are taken in reacts with the surrounding oxidizable glass during remelting and generates a large amount of bubbles, so that it cannot be practically used as a glass raw material. Inconvenience occurs.

As another method of effectively utilizing glass fiber waste material, Japanese Patent Laid-Open Publication No. Hei 3-60788 discloses that glass fiber waste material is heated to a temperature lower than the softening point of glass fiber in the presence of 0 to 10% of oxygen. A method for removing organic substances by thermal decomposition is disclosed. In this method, by carefully selecting conditions, glass fibers containing no organic matter can be recovered and can be reused as a raw material for producing glass fibers, but the oxygen partial pressure of the atmosphere and the processing temperature are strictly controlled. There is a need. In particular, when the difference between the above-mentioned decomposition start temperature of the organic substance and the softening point of the glass fiber is small, if the organic substance is to be completely removed, melting of the glass fiber starts. Organic matter will be taken in.

[0008] In any of these conventional methods, the glass fiber waste material is supplied from a place different from the burner flame or the electrode of the heating source, so that an unburned portion is generated in a part. This unburned part should also be ignited by the heat generated when the organic matter in the surrounding waste burns, but oxygen is consumed when the organic matter in the surrounding waste is burned, and the oxygen concentration near the unburned part decreases. However, ignition is hindered, and as a result, organic matter remains in the recovered inorganic matter.

Further, in these prior arts, heating energy is applied to glass fiber waste material to remove organic substances, and then cooled to room temperature to be used as a glass raw material. Heating energy must be input again. Therefore, a large amount of energy is required from the recovery of the glass fiber waste material to the production of the glass fiber, and there is also a problem that the scale of the recycling apparatus becomes large.

Accordingly, the present invention provides a method for recovering glass components from waste glass wool for adiabatic sound absorbing material, in which the decomposition start temperature of the resin and the softening point of the glass are close to each other, and the glass fiber coated with an organic substance. Provided is a glass fiber waste material recycling apparatus that can completely remove organic matter and efficiently recycle glass fiber waste material by directly putting glass fiber from which organic matter has been removed into a glass melting furnace. It is intended to be.

[0011]

In order to achieve the above object, a glass fiber waste material recycling apparatus according to the present invention comprises a plurality of glass fiber waste forming apparatuses, each of which forms a combustion flame for heating and melting glass raw materials in a melting chamber for melting the glass raw materials. And dispersing, in at least one of the plurality of burners, a waste material of glass fiber coated with an organic substance in a combustion flame formed by the burner together with a combustion supporting carrier gas. It is characterized in that a glass fiber waste material supply means for supplying is provided.

[0012]

1 to 5 show an embodiment of a glass fiber waste material recycling apparatus according to the present invention.
2 is a cross-sectional view of the glass melting furnace, FIG. 2 is a vertical cross-sectional view showing the installation state of the burner, FIG. 3 is a vertical cross-sectional view showing another installation state of the burner, FIG. 4 is a cross-sectional side view of the burner, and FIG. FIG.

This glass fiber waste material recycling apparatus includes a burner 3b installed on a side close to a raw material input section 4 among six burners 3a to 3f installed in a melting chamber 2 of a glass melting furnace 1. The one provided with the glass fiber waste material supply means 5 is used.

As shown in FIGS. 4 and 5, the burner (hereinafter referred to as waste material supply burner) 3b is a central waste material flow path 1 for supplying glass fiber waste material with a carrier gas.
1, a fuel passage 12 on the outer periphery of the waste material passage 11, and a primary combustion supporting gas passage 13 and a secondary combustion supporting gas passage 14 on the outer periphery of the fuel passage 12. The cooling water jacket 15 is provided on the outer periphery of the burner main body, and the nozzle 16 at the tip is provided with a conical combustion chamber 17 whose jetting direction is widened.

In the center of the innermost part of the combustion chamber 17, a waste material passage 1 is provided.
1, a plurality of fuel outlets 22 on the outer circumference of the waste material outlet 21, and a plurality of primary combustible gas outlets 23 and a secondary fuel outlet 22 on the outer circumference of the waste material outlet 21. Each of the supporting gas outlets 24 is provided.

A carrier gas supply pipe 3 is provided in the waste material passage 11.
1, a hopper 32 for storing glass fiber waste material cut to an appropriate size, a fixed amount discharging device 33 for discharging a predetermined amount of glass fiber waste material in the hopper 32, and a glass discharged from the fixed amount discharging device 33. The glass fiber waste material supply means 5 comprising a screw feeder 34 for sending fiber waste material to the waste material flow path 11 is connected. The glass fiber waste material in the hopper 32 is supplied from the fixed amount discharge device 33 through the screw feeder 34 into the waste material flow path 11 in a substantially constant amount per unit time, and is accompanied by the carrier gas supplied from the carrier gas supply pipe 31, After forming a solid-gas multi-phase flow and flowing through the waste material flow path 11, the waste material jet 21 at the tip of the burner
From the burner in the direction of the extension of the central axis of the burner.

A fuel supply pipe 41 is connected to the fuel flow path 12, and the fuel supplied from the fuel supply pipe 41 to the fuel flow path 12 is ejected from the fuel injection port 22 in a direction parallel to the central axis of the burner. I do. Further, a primary combustion supporting gas supply pipe 42 is provided in the primary combustion supporting gas flow path 13, and a secondary combustion supporting gas flow path 1 is provided in the primary combustion supporting gas flow path 13.
The primary combustion supporting gas supplied to the primary combustion supporting gas passage 13 is connected to the secondary combustion supporting gas supply pipe 43 from the primary combustion supporting gas outlet 23 through the burner center shaft 4. The secondary combustion supporting gas ejected in the tangential direction of a circle centered on the center and supplied to the secondary combustion supporting gas flow path 14 extends from the secondary combustion supporting gas ejection port 24 on the extension of the burner central axis. Squirt to focus. Note that a cooling water supply pipe 44 and a cooling water return pipe 45 are connected to the cooling water jacket 15.

There are no particular restrictions on the fuel and the supporting gas supplied to the waste material supply burner 3b, and the same fuel and oxygen-containing gas as those used in a normal glass melting burner installed in the glass melting furnace 1 may be used. it can. Further, various gases can be used as the carrier gas, but usually,
A part of the supporting gas may be used.

The waste material supply burner 3b thus formed
The fuel and the supporting gas are supplied to the fuel cell to generate a combustion flame, and the glass fiber waste material coated with the organic material is cut into an appropriate size, and the waste material is discharged into the waste material outlet 2 at the center of the burner.
When ejected from 1, the glass fiber waste material is supplied into the combustion flame in a state of being dispersed in the carrier gas, and an oxygen gas necessary for burning organic matter becomes an environment surrounding each glass fiber waste material particle. Further, since the glass fiber waste material particles and the oxygen gas are wrapped in the high-temperature combustion flame, the organic matter on the glass fiber surface instantaneously reacts with the oxygen gas to start ignition combustion. At this time, since the individual glass fiber waste material particles are in a dispersed state, the carbon dioxide gas and water vapor, which are combustion product gases, are not taken into the particles but are removed from the glass fibers. At the same time, the glass fiber is heated by the heat of combustion of the organic matter and the heat transfer from the combustion flame, and becomes a molten or semi-molten state.

The glass fiber waste material spouted from the waste material supply burner 3b is removed from the organic matter in the combustion flame and becomes a molten or semi-molten state, and becomes a molten or semi-molten state. The glass fiber can be efficiently taken into the glass raw material since the glass fiber falls from the raw material 4 to the surface of the raw material supplied into the melting chamber 2.

That is, by supplying the glass fiber waste material in a dispersed state in the combustion flame, the organic matter can be completely removed by burning without generating a glass block unlike the conventional one. Furthermore, it can be carried out using a normal glass melting furnace, and no special equipment is required for collecting glass fiber waste, so the equipment cost is low and, in addition, the amount of heat generated by the combustion of organic substances Can be used as a heating source for glass fibers and glass raw materials,
Energy consumption can be reduced as compared with the case where glass fiber waste is not treated.

The structure of the waste material supply burner 3b is not limited to the structure shown in the above embodiment, but may be selected according to the properties of the fuel, the scale of the apparatus, the installation position in the glass melting furnace 1, and the like. can do. Further, the installation position and the number of the waste material supply burners 3b in the glass melting furnace 1 can be arbitrarily set. Further, the size of the glass fiber waste supplied to the waste material supply burner 3b can be arbitrarily determined according to the properties of the glass fiber waste and the structure of the waste material supply burner 3b. Also, waste material supply burner 3b
As shown in FIG. 3, the same applies when the flame is set so that the flame collides with the surface of the glass melt 6 in the melting chamber 2 or the raw material hill surface supplied into the melting chamber 2 from the raw material charging section 4. The effect can be obtained.

[0023]

EXAMPLE An experiment was conducted in which glass fiber waste was recovered using a glass melting furnace and a waste material supply burner having the structure shown in the above embodiment, and recycled as glass fiber again. The glass fiber waste material is glass wool waste material in which the surface of a glass fiber having a diameter of 6 to 10 μm and a relatively low softening point is coated with 8% by weight of a phenol resin, which is about 500 μm in length.
Into a hopper. LPG was used as the fuel, pure oxygen was used as the supporting gas and the carrier gas, and the supply ratio between the primary supporting gas and the secondary supporting gas was 3: 7. The amount of carrier gas was set according to the amount of waste material supplied.

FIG. 6 shows the ratio of the amount of glass fiber waste supplied from the waste material supply burner to the amount of melting in the glass melting furnace, that is, the waste material return rate (waste material / total melting amount).
And the reduction rate of the energy consumption unit of the manufactured glass fiber. As is clear from the figure, by supplying the glass fiber waste material to the waste material supply burner and treating it in comparison with the case where the glass fiber waste material is not treated, the energy consumption of about 5% is reduced by a waste material return rate of 10%. It can be seen that the reduction can be realized. This is because the resin contained in the waste material replaced the fuel, and the fuel supplied to the burner could be reduced.In addition, in the glass melting furnace, there was no problem such as foaming due to the residual organic matter, There was no difference in quality of the manufactured glass fiber compared to the case where no glass fiber waste was treated.

[0025]

As described above, the glass fiber waste material recycling apparatus of the present invention is configured to throw the glass fiber waste material coated with the organic substance into the combustion flame of the burner for treatment, thereby completely removing the organic substance. The carbon dioxide gas and water vapor, which are organic substances or combustion products, are not taken into glass fibers or glass raw materials. Thus, waste materials having a small difference between the organic substance decomposition start temperature and the softening point of glass can be treated without any problem. Further, since the heat of combustion of organic substances can be effectively used as energy for melting, the energy consumption of glass to be produced can be reduced.

The glass fiber, which has been heated by the heat of combustion of the organic matter and the heat transferred from the combustion flame and is in a molten or semi-molten state, falls or collides with the molten glass or the raw material mountain surface, thereby reducing the amount of waste glass fiber. The glass component can be efficiently taken in as the glass material, and the glass fiber waste can be recycled with high efficiency.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a glass melting furnace showing one embodiment of a glass fiber waste material recycling apparatus of the present invention.

FIG. 2 is a longitudinal sectional view showing an installation state of a burner.

FIG. 3 is a longitudinal sectional view showing another installation state of the burner.

FIG. 4 is a sectional side view of a waste material supply burner.

FIG. 5 is a front view of the same.

FIG. 6 is a diagram showing a relationship between a waste material return rate and a reduction rate of an energy consumption unit in the example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Glass melting furnace, 2 ... Melting chamber, 3a-3f ... Burner (3b ... Waste material supply burner), 4 ... Raw material supply part, 5 ... Glass fiber waste material supply means, 11 ... Waste material flow path, 12 ... Fuel flow path, 13: Primary combustion supporting gas flow path, 14: Secondary combustion supporting gas flow path, 15: Cooling water jacket, 16: Nozzle, 17 ...
Combustion chamber, 21 ... Waste material outlet, 22 ... Fuel outlet, 23 ...
Primary combustible gas spout, 24 ... Secondary combustible gas spout,
DESCRIPTION OF SYMBOLS 31 ... Conveyance gas supply pipe, 32 ... Hopper, 33 ... Fixed amount discharger, 34 ... Screw feeder, 41 ... Fuel supply pipe, 42 ... Primary combustion supporting gas supply pipe, 43 ... Secondary combustion supporting gas supply pipe, 44 ... Cooling water supply pipe, 45 ... Cooling water return pipe

Continuing on the front page (72) Inventor Shingo Murakami 1-16-7 Nishi-Shimbashi, Minato-ku, Tokyo Nippon Sanso Co., Ltd. (72) Inventor Chiaki Manabe 3-6-3 Kanda Kaji-cho, Chiyoda-ku, Tokyo Asahi Fiberglass F term in the company (reference) 4D004 AA18 BA06 CA29 CB28 CB34 4G014 AB00 AF00

Claims (1)

[Claims] 1. A melting chamber for melting a glass raw material, wherein a plurality of burners for forming a combustion flame for heating and melting the glass raw material are provided, and at least one of the plurality of burners is provided with the burner. A glass fiber waste material recycling device, comprising: glass fiber waste material supply means for dispersing and supplying glass fiber waste material coated with an organic substance to a combustion supporting gas in a combustion flame formed by the method.