JPH0547254B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for controlling the quantitative discharge of melt in a melting furnace for producing rock wool.

[Conventional technology]

High-temperature molten slag, which is a large amount of by-product from blast furnaces at steel plants, is quenched with water and processed into granulated slag, which is used for blast furnace cement, cement mixtures, ground improvement materials, concrete aggregates, etc. ing. In addition, this slag is discharged onto a vast site, cooled, and processed into crushed slag (slow-cooled slag), which is used as roadbed material, aggregate, landfill material, and as a raw material for rock wool.

Conventional rock wool production involves adding component adjusting materials to crushed slag stone as necessary, remelting it in an electric furnace, cupola, etc., and turning the molten material into fibers using centrifugal force and/or fluid pressure such as compressed air or steam. method is being adopted. Recently, from the viewpoint of energy saving, a method has been attracting attention in which high-temperature molten slag from a blast furnace is transported in a pot truck or the like, then directly charged into an electric furnace, and the composition and temperature are adjusted in the electric furnace before being turned into fibers.
In this method, the sensible heat of the molten slag can be used as is, so a large amount of energy can be saved compared to conventional manufacturing methods.

[Problem that the invention seeks to solve]

By the way, in any manufacturing method, the discharge flow rate of the molten material supplied from the melting furnace such as the electric furnace to the cotton milling machine must be changed in order to switch the type of rock wool product, adjust the production volume, and maintain and inspect the equipment. The need arises. The discharge flow rate can be adjusted by changing the opening degree of the outlet by replacing the nozzle removably attached to the outlet of the melting furnace with a nozzle of the desired inner diameter. Replacing the nozzle is dangerous, and it takes time to fix the nozzle, reducing work efficiency.

SUMMARY OF THE INVENTION An object of the present invention is to provide a quantitative discharge adjustment method that can easily and reliably adjust the flow rate of melt discharged from a melting furnace.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention forms a nozzle protected by a water-cooled jacket for discharging high-temperature melt at the lower side wall of a melting furnace for producing rock wool, and a ring with a small inner diameter is fitted and fixed into this nozzle. , each time the melt discharge flow rate is changed,
Replace only the ring concerned with a ring having an inner diameter of the outlet hole that matches the set discharge flow rate of the melt,
The method is to adjust quantitative emissions.

In this case, high-temperature molten slag and composition adjustment material such as silica stone are intermittently charged into the melting furnace in predetermined amounts, and the furnace body of the melting furnace is tilted to transfer the high-temperature molten slag to the above-mentioned. It is desirable to continuously discharge a fixed amount from the nozzle to the cotton machine.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the accompanying drawings.

Figure 1 shows a method for adjusting the quantitative discharge of high-temperature molten material according to the present invention, in which molten slag is charged as a main raw material into an electric furnace 1 as a melting furnace, and high-temperature molten material is discharged in fixed amounts to produce rock wool, etc. This is shown in an example for the case where High-temperature molten slag from a blast furnace (not shown) is transported to an electric furnace 1 by a pot car 2, and is intermittently fed into a predetermined amount through a funnel-shaped injection device 3 installed on the upper wall of the electric furnace 1. electric furnace 1
charged inside. Then, silica stone and the like are added through the component adjustment material supply pipe 7, heated and melted to a predetermined temperature (1400 to 1600°C) in the electric furnace 1, and then heated and melted in the electric furnace 1.
A predetermined amount of cotton wool is continuously supplied from a nozzle 4 provided at the lower part of the side wall of the cotton mill to a cotton milling machine 5 to produce rock wool. The molten slag supplied from the nozzle 4 to the cotton mill 5 can be kept constant at all times by gradually tilting the electric furnace 1 in response to the gradually changing amount of molten slag in the electric furnace 1. It is continuously supplied to the cotton making machine 5, so that the quality and yield of rock wool can be maintained. Note that the amount of molten slag is measured by a load cell 6 placed on the lower surface of the electric furnace 1. In FIG. 1, reference numeral 8 is a hydraulic cylinder device for tilting the electric furnace 1, and 9 is a roller portion on which the electric furnace 1 is placed.

In this embodiment, the nozzle 4 of the electric furnace 1 is
As shown in FIG. 2, the nozzle 4 is provided at the lower part of the side wall of the electric furnace 1 lined with a layer of heat-resistant bricks 10, and a cylindrical guide member 11 is fitted into the side wall and attached to the tip of the nozzle 4. There is. The nozzle 4 is made of a heat-resistant material (copper, for example) and has a predetermined shape so as to be able to withstand the high heat of the molten slag.
Nozzle 4
The whole thing is water cooled and protected.

3 and 4 show an embodiment of the present invention in which the discharge flow rate of the melt from the electric furnace 1 can be changed by a simple means. In other words, the amount of molten material discharged from the nozzle 4 varies depending on the viscosity and temperature of the molten material, and it is also necessary to change the amount of molten material discharged depending on the production amount and the type of product. However, in this embodiment, a ring 14 made of a heat-resistant material (for example, copper) with a different inner diameter is replaced and fixed by fitting it in the opening 13 of the nozzle 4, without replacing the nozzle 4 itself every time the discharge flow rate of the melt is changed. By doing so, the diameter of the opening 13 of the nozzle 4 can be changed. The ring 14 is formed, for example, in the shape of a truncated cone so that the outer circumferential shape approximately matches the shape of the opening 13 of the nozzle 4, and when attached, the outer circumferential wall of the ring 14 is attached to the inner circumferential wall of the opening 13 of the nozzle 4. In addition to wearing it closely,
It is fixed to the inner peripheral wall of the nozzle 4 by means such as welding. In this way, by preparing several types of rings 14 with different inner diameters each having an outflow hole 15 formed in the center that determines the outflow amount of molten slag per unit time, it is possible to The nozzle 4 can be easily replaced by simply replacing these rings 14.
The discharge flow rate from can be changed.

The above embodiments can also be applied to the production of rock wool from molten slag from a blast furnace, as well as to the production of artificial stones such as Devitro Ceram.Furthermore, the present invention can be applied to the quantitative discharge of molten iron, molten copper, etc. It goes without saying that the present invention can be applied, and the melting furnace is not limited to electric furnaces, but can also be applied to other general melting furnaces.

〔effect〕

As explained above, according to the method for regulating the quantitative outflow of high-temperature melt according to the present invention, a nozzle protected by a water-cooled jacket for discharging high-temperature melt is formed at the lower part of the side wall of a melting furnace for producing rock wool, and this nozzle is A ring with a small inner diameter is fitted and fixed inside, and each time the discharge flow rate of the melt is changed, only that ring is replaced with a ring whose outlet hole has an inner diameter that matches the set discharge flow rate of the melt, and a fixed amount is discharged. By adjusting the amount, conventionally, the amount of melted wool supplied from a melting furnace such as an electric furnace to a cotton milling machine was When it was necessary to change the discharge flow rate of a material, the nozzle itself was replaced each time the flow rate was changed.In contrast, in the present invention, the nozzle itself can be changed by using a non-dissolving nozzle with a diameter that matches the set discharge flow rate. This problem can be solved simply by replacing only the ring made of the substance inside the water-cooled nozzle and fitting it into place.

Since it is easy to adjust the discharge flow rate for an appropriately changed nozzle diameter, it becomes easier to additionally charge molten materials such as high-temperature molten slag and composition adjustment materials such as silica stone, improving work efficiency. This makes it possible to control the flow rate of quantitative discharge more precisely and reliably.

In addition, the nozzle diameter can be easily changed and raw materials can be easily replenished, making it easy to homogenize the melt.
The durability of the melting furnace and the nozzle, especially the constricted portion thereof, can be improved.

Furthermore, during quantitative discharge, by either fixing the furnace body in the melting furnace or tilting it,
By discharging a fixed amount at a time from a ring-equipped nozzle, it is possible to discharge a homogeneously adjusted melt in equal amounts, making it possible to obtain products such as high-quality rock wool.

[Brief explanation of the drawing]

FIG. 1 is an overall view of an electric furnace for carrying out the quantitative discharge adjustment method for high-temperature molten material according to the present invention, FIG. 2 is a cross-sectional explanatory view of the electric furnace, and FIG. 3 is an exploded perspective view showing a ring attachment means. FIG. 4 is an explanatory cross-sectional view of the ring attached to the nozzle. 1... Melting furnace, 4... Nozzle, 13... Opening, 14... Ring, 15... Outflow hole.

Claims (1)

[Claims] 1. A nozzle protected by a water-cooled jacket for discharging high-temperature melt is formed at the lower side wall of a melting furnace for producing rock wool, and a ring with a small inner diameter is fitted and fixed in this nozzle to discharge the melt. A method for adjusting the quantitative discharge of high-temperature melt, characterized in that each time the flow rate is changed, only the ring concerned is replaced with a ring having an inner diameter of an outflow hole that matches the set discharge flow rate of the melt, thereby adjusting the quantitative discharge amount. . 2. Intermittently charge predetermined amounts of high-temperature molten slag and composition adjustment materials such as silica stone into the melting furnace,
Quantitative discharge adjustment of the high-temperature molten material according to claim 1, characterized in that the furnace body of the melting furnace is tilted to continuously discharge the high-temperature molten slag from the nozzle to the cotton milling machine. Method.