JPS633236B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for injecting a melt into a closed container.

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 adopted.

In this way, the method of cooling and solidifying the molten slag from the blast furnace and then remelting it was adopted because in the case of crushed slag, the molten slag was easier to transport, store, weigh, and handle. This is because there is an advantage.

However, this method of cooling the high-temperature molten slag and then remelting it requires a large amount of energy for remelting, which increases the production cost of rock wool. A production method that saves energy by injecting slag together with a composition adjusting material into a melting furnace such as an electric furnace is attracting attention.

A technical problem with this method is how to maintain the sealed state inside the melting furnace during the injection of molten slag. That is, carbon electrodes are generally used in electric furnaces, and the inner walls are lined with carbon bricks to protect the inside of the electric furnace from the corrosive properties of molten slag. Therefore, in order to prevent these carbon materials from being oxidized, the inside of the electric furnace is sealed to ensure that no air enters, and to prevent the inert gas such as nitrogen gas filled inside from flowing out. This is because it is necessary.

However, it is quite difficult to continuously inject high-temperature molten slag using a simple method while keeping the inside of the electric furnace sealed. The current situation is that molten slag is injected into the electric furnace while the airtightness inside the furnace is insufficient, or that airtightness is ensured using extremely complicated methods.In the former case, the durability of the electric furnace decreases. In addition, in the latter case, it was a cause of lowering workability.

An object of the present invention is to make it possible to reliably maintain the airtight state inside the airtight container by a simple means when a high-temperature molten material is injected into the airtight container, and to improve the durability of the airtight container. An object of the present invention is to provide a method for injecting a melt into a closed container and an apparatus for the same, which improves workability.

The gist of the method for injecting melt into a closed container according to the present invention is that a receiver for the melt is provided in the closed container via an injection port whose opening degree can be adjusted, and the melt temporarily stored in the receiver is When injecting a substance into a sealed container, the opening degree of the injection port is adjusted so that the upper end of the injection port is located below the surface level in response to changes in the surface level of the molten material. The gist of the melt injection device according to the present invention is to prevent atmospheric gas from flowing into the sealed container from the inside of the container. a lift gate for opening and closing the injection port, a detection means for detecting a change in the surface level of the molten material when the molten material temporarily stored in the receiver is injected into the closed container; The device is comprised of a control device that controls the opening degree of the lift gate based on the control signal, and a drive device that moves the lift gate up and down based on this control signal.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The method and apparatus according to the present invention will be explained below based on the embodiments shown in the accompanying drawings.

FIG. 1 shows an embodiment in which an electric furnace 2 is equipped with a molten material injection device 1 according to the present invention, and high-temperature molten slag from a blast furnace (not shown) is directly transferred to the electric furnace 2 by a ladle car 3. and is injected into the electric furnace 2 in predetermined amounts via the injection device 1. At this time, the component adjusting material is supplied to the electric furnace through another conduit (not shown).

As shown in FIGS. 2 to 4, the injection device 1 has a receiver 4 with an open top for temporarily storing molten slag from a pan wheel 3, which is electrically connected by four support legs 5. Molten slag is injected into the electric furnace 2 through an injection port 8 fixed to the upper outer wall surface of the furnace 2 and opened in one side wall 7 of the receiver 4. This inlet 8 is opened in a frame 9 that is fitted and fixed to one side wall 7 of the receiver 4, and allows water to flow into a cavity 10 formed inside the frame 9. The frame body 9 is cooled with water and the injection port 8 is protected.
Further, in this embodiment, one side wall 7 of the receiver 4
An elevating gate 11 that opens and closes the inlet 8 while slidingly contacting the outer wall surface of the frame body 9 is disposed on the outside of the frame body 9. It can be moved up and down by a fixed hydraulically driven cylinder device 13. Furthermore, the injection port 8 of the receiver 4 and the receiving port of the electric furnace 2 are connected by a closing portion 15 that forms a communication passage 20 shielded from the outside between the two.
5, and a pair of L-shaped guide members 14a and 14b into which both sides of the lift gate 11, which is formed to protrude from the left and right sides of the frame 9 at the lower part of the guide port 17, are fitted. The position of the lift gate 11 is regulated by, and the lift gate 11 moves up and down along these guide ports 17 and guide members 14a, 14b.
The hermeticity between the frame body 9 and the lift gate 11 is maintained.

Like the frame body 9, the lift gate 11 is formed of a plate-like body having a hollow portion 18 inside, and the entire body is protected by water cooling.

In this device, the lifting gate 11 is moved up and down by automatic control means, and a detector 19 installed on the upper surface of the support member 12 at the upper end of the receiver 4 detects changes in the surface level of the molten slag. Based on the signal, a control device (not shown) sets the opening degree of the injection port 8, and based on this set value, the cylinder device 13 is driven to move the elevator gate 11 up and down to a predetermined position. In this embodiment, the detector 19 is composed of a photoelectric detector using a photoelectric conversion element, and is configured to detect changes in the surface level of the molten slag by changes in the amount of light. Changes in surface level may also be detected by other means, such as ultrasound or electromagnetic waves.

The lifting gate 11 can be moved up and down by the automatic control means, but the lower end level of the lifting gate 11 is always controlled to be located below the surface level of the molten slag, and electricity is supplied from the injection port 8. The opening degree of the injection port 8 is adjusted so that atmospheric gas such as air does not flow into the furnace 2 .

Therefore, when injecting high-temperature molten slag into the electric furnace 2 equipped with the injection device 1 configured as described above, first, as shown in FIG. 3, the molten slag is transported to the vicinity of the side of the injection device 1, the pot is tilted, and a predetermined amount of molten slag is poured into the receiver 4 while measuring the weight with a load cell 21 provided at the bottom of the electric furnace 2. In this state, the lifting gate 11 is fully lowered as shown in FIG.
Prevent it from flowing inside. Next, the lifting gate 11 is gradually raised, the injection port 8 is opened, and the molten slag in the receiver 4 is poured from the injection port 8 into the electric furnace 2.
supply inside. In this case, since the amount of molten slag in the receiver 4 is large at first, the lift gate 11 is raised high to keep the opening of the inlet 8 large, increasing the amount of molten slag flowing in and increasing the supply time. Aim to shorten the time. As the molten slag in the receiver 4 decreases, the detector 19 detects a change in its surface level, and the elevator gate 11 is gradually lowered based on a preset control signal. The opening degree of the injection port 8 is adjusted so that the surface level is always located above the lower end of the lifting gate 11. Then, at approximately the same time that the entire amount of molten slag in the receiver 4 finishes flowing out into the electric furnace 2, the elevator gate 11
The injection port 8 is completely closed to prevent communication between the inside of the electric furnace 2 and the outside air via the injection port 8.

In addition, in the above embodiment, an example was explained in which molten slag from a blast furnace is injected into the electric furnace 2, but it is not limited to blast furnace slag, but may also be molten slag, molten iron, or molten copper discharged from a converter or electric furnace. Needless to say, the present invention can also be applied to the case where a molten material such as molten aluminum is injected into a closed container such as the electric furnace 2.

Further, in the method of the above embodiment, the change in the surface level of the melt is detected by the detector 19, and the opening degree of the injection port 8 is adjusted by the automatic control means based on this detection signal, but the present invention Of course, the change in the surface level of the molten material may be visually measured and the cylinder device 13 may be operated based on the change.

Further, in the above embodiment, the case where the molten material injection device 1 is installed in the electric furnace 2 has been described, but it can be applied not only to the electric furnace 2 but also as an injection device for injecting molten material into a wide range of containers that require airtightness. Of course it can be done. In addition, at that time, in the above embodiment, the receiver 4
is fixed to the electric furnace 2 by the support legs 5, but by making the front support leg rotatable and the rear support leg movable up and down by cylinder drive. , the receiver 4 itself may be tilted with respect to the electric furnace 2. In this case, the closing portion 15 is formed into a bellows shape.

As explained above, according to the method for injecting a melt into a closed container according to the present invention, it is possible to directly inject the melt while maintaining the airtightness inside the closed container by a simple means, and the durability of the closed container is improved. In addition, it is possible to save energy and improve work efficiency due to direct injection of molten material.

Moreover, according to the injection device according to the present invention, it is possible to reliably maintain the airtightness of the inside of the closed container when injecting the melt, so that the durability of the closed container can be improved. Furthermore, since the opening degree of the injection port is adjusted by automatic control means, the opening degree can be adjusted reliably with a simple means.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of injecting melt from a pan wheel into an electric furnace using a melt injection device according to the present invention, Fig. 2 is a perspective view of the melt injection device, and Fig. 3 is a note. FIG. 4 is a longitudinal sectional view of the injection device showing the inlet fully closed, and FIG. 4 is a longitudinal sectional view of the injection device showing the injection port half open. 1... Melt injection device, 2... Electric furnace (closed container), 4... Receiver, 6... Outer wall surface, 8... Inlet,
11... Lifting gate, 13... Cylinder device (drive device), 19... Detector (detection means).

Claims (1)

[Scope of Claims] 1. A receiver for the melt is provided in the closed container through an injection port whose opening degree can be adjusted, and when the melt temporarily stored in the receiver is injected into the closed container, the melt is Adjusting the opening of the injection port so that the upper end of the injection port is located below the surface level in response to changes in the surface level, and preventing atmospheric gas from flowing into the closed container from the injection port. A method for injecting melt into a sealed container. 2. A receiver for the melt that is attached to the outer wall of the sealed container via an injection port, an elevator gate that opens and closes the injection port, and a gate that opens and closes the above injection port, and a Consisting of a detection means for detecting a change in the surface level of the molten material, a control device for controlling the opening degree of the lift gate based on this detection signal, and a drive device for moving the lift gate up and down based on this control signal. An apparatus for injecting melt into a closed container, characterized in that: