JPS585853B2 - Inorganic fiber manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for manufacturing inorganic fibers such as glass and slag.

Inorganic fibers such as glass and slag have a wide range of uses as materials for heat insulating materials, soundproofing materials, etc., and an apparatus for producing such inorganic fibers is shown in FIG.

In FIG. 1, a molten inorganic material 1 is flowed down from a flow-down port 3 provided at the bottom of a container 2, and high-temperature steam, high-pressure, high-temperature flame, etc. are blown onto the flowing molten material 4 from an injection port 5 to form a so-called fiber. Inorganic fibers are manufactured using the spraying method.

According to the spraying method, the state of the obtained fibers depends on the melting temperature of the inorganic material 1 (i.e., the viscosity of the material at the time of fiberization), the flow outlet 3
The diameter of the injection burner 6, the opening area of the injection port 5 of the injection burner 6, the installation location of the injection burner 6, the temperature of the injection gas from the injection port 5, etc.

In particular, the temperature of the injected gas is one of the important fiberization conditions; for example, when fiberizing glass with a relatively low softening point,
If the injected gas from the injection port 5 is at a sufficiently high temperature, the desired fine glass fibers can be easily produced.

However, as the temperature of the injected gas decreases, the fiber diameter increases and eventually fiberization becomes impossible.

In order to reduce the thermal energy required for fiberization, it is necessary to use a flame as low as possible, and in order to obtain fine fibers, it is necessary to create a composition that lowers the softening point of the inorganic material, such as glass. Therefore, it is particularly necessary to install the injection port 5 in a position extremely close to the downstream port 3.

However, as a result of the injection port 5 and the injection burner 6 being maintained at a low temperature, the outside air around them or the inflowing outside air also becomes close to the temperature of the injection burner 6, and flows down due to convection of the outside air or thermal radiation from the injection burner 6. The bottom of the container 2 provided with the opening 3 is cooled and the temperature of the molten inorganic material 1 is reduced.

Therefore, in order to maintain the proper viscosity necessary for fiberization, it becomes necessary to add extra heat of fusion to the container 2, and the overall thermal energy cannot be saved.

The present invention eliminates the above-mentioned drawbacks and provides an apparatus for producing inorganic fibers using as little thermal energy as possible.

In other words, the present invention provides a heat insulating heat insulating body with a nozzle in which the direction of gas injection is directed downward, on the outer periphery of the lower end of the melt outlet formed at the bottom of a container containing a melt of an inorganic material that can be made into fibers. It was installed with the intervention of

Embodiments of the present invention will be described below based on the accompanying drawings.

In FIG. 2, I is a container containing a melt of an inorganic material 1 such as glass, and is made of platinum, rhodium alloy, etc., and a terminal 8 is integrated into a part of the container T, and a low voltage Electrically connected to a current source.

The container 7 is heated by electrical resistance to moderate the viscosity of the melt contained therein.

The molten material having a predetermined viscosity flows down from a flow opening 9 formed at the bottom of the container 7.

10 is a nozzle having a gas injection port 11, which is installed on the outer periphery of the lower end of the flow port 9, and is configured to spray jet gas diagonally downward onto the melt 12 flowing down from the flow port 9.

The injection port 11 may be in the shape of a ring surrounding the melt 12, or may be in the shape of a slit surrounding the melt 12.

Furthermore, the flow outlet 9 may be formed into a cylindrical body, and a slit may be formed in the side wall of the cylindrical body.

In either case, the direction of gas injection must be parallel to or diagonally downward to the flowing melt 12 so as to be in contact with it downwardly to form fibers.

The nozzle 10 is made of platinum, rhodium alloy, heat-resistant steel, stainless steel, steel plate, etc. depending on the temperature of the gas to be injected.

Further, there is a certain gap between the nozzle 10 and the bottom of the container 7, and a heat insulating body 13 is interposed in this gap.
The outer periphery of is also surrounded by a heat insulating body 13.

The heat insulating body 13 may be made of diatomaceous material, magnesia, rock wool, kaolin wool, quartz wool, etc., as long as it can be used as a heat insulating material for high temperatures.

The thickness of the heat insulating body is not particularly limited and is determined by the difference between the temperature at the bottom of the container 7 and the temperature at the nozzle 10. However, if the temperature difference between the two is extremely large, the thickness of the heat insulating body 1
If thermal insulation is not sufficient with 3 alone, a device such as the one illustrated in FIG. 3 is effective.

In FIG. 3, the thickness of the heat insulating body 13 is made larger than in the case of FIG.
In order to maintain the temperature of 2 appropriately, an auxiliary heating element 15 is installed inside the heat insulating body 13 and around the outside of the outlet 14.

As the auxiliary heating element 15, for example, a silicon carbide heating element, a platinum resistance heating element, etc. can be used, but in the example shown in FIG. I'm using something like that.

It is most effective to install the auxiliary heating element 15 in a ring shape around the outside of the downstream opening 14.

In the apparatus of the present invention, a container 7 that must be maintained at a high temperature and a nozzle 1 that is desirably kept as low as possible.
0 is thermally insulated by the heat insulating body 13, so even if low temperature gas is sprayed onto the melt 12 from the injection port 11, the bottom of the container 7 will not be cooled, and the bottom of the container 7 will not be cooled until the low temperature gas is sprayed. The temperature of the melt 12 can be maintained at appropriate conditions.

In this device, the above function can be maintained even if compressed air at room temperature or a temperature close to room temperature is blown from the injection port 11 from the air supply pipe 16 connected to the compressor, for example.

As described above, according to the present invention, when producing inorganic fibers by the blowing method, it is possible to sufficiently make the fibers even if the temperature of the ejected gas is considerably lowered, which greatly contributes to energy saving. It is easy to install, as all you have to do is install the necessary parts on the outside.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing a conventional device, FIG. 2 is a schematic explanatory diagram showing an example of the device of the present invention, and FIG. 3 is a schematic explanatory diagram showing another example of the device of the present invention. It is a diagram. 1...Inorganic material, 2,7...Container, 3,9.14
... Flowing port, 4, 12... Melt, 5, 11...
Injection port, 6... Injection burner, 8... Terminal, 10.
- Nozzle, ... 13... Heat insulating body, 15... Auxiliary heating element, 16... Air pipe.

Claims (1)

[Claims] 1. A melt outlet is formed at the bottom of a container containing a melt of an inorganic material that can be made into fibers, and a nozzle that surrounds the outer periphery of the lower end of the outlet and opens inward is provided. , an apparatus for producing inorganic fibers by blowing low temperature gas downward onto the melt flowing down from a flow opening, characterized in that the nozzle is installed closely at the bottom of the container via heat insulation. . 2. The device according to claim 1, wherein an auxiliary heating element is provided within the heat insulating body. 3. The device according to claim 1, wherein the melt outlet has a throat shape.