JPS59166613A - Sealing equipment of skirt part in converter waste gas treating device - Google Patents

Abstract

PURPOSE:To prevent the occurence of trouble due to dust, by a method wherein a drainage ditch is arranged along the outer periphery of the water seal part of U-shape in section and a screw at its bottom part to discharge the dust to the ditch. CONSTITUTION:The gap between a converter 1 and a hood 2 is sealed with a skirt 3 and the outer periphery of skirt 3 is filled with water by providing the water seal part 4 of U-shape in section thereto and it is sealed with a sealing cylinder 6. A drainage ditch 5 is provided along the upper outer periphery of this water seal part 4, a screw 10 having flexibility being provided to its bottom part and the screw 10 is made to raise the dust from the botton part of water seal part 4 to the drainage ditch 5. When dust is settled on the bottom part of water seal part 4, the dust is agitated by the rotation of screw 10; the dust of small specific gravity being, in a floating manner, discharged to the drainage ditch 5 by the overflow water of water seal part 4 and the dust of large specific gravity is transferred with the screw 10 and discharged to the drainage ditch 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealing device for a skirt in converter exhaust gas treatment equipment, and more particularly, to a sealing device for a skirt that solves the problem of dust accumulating on the shell.

CO gas generated from the converter during refining is drawn into an exhaust gas treatment device, cooled and dusted, and then recovered as gas.

On the other hand, this CO gas is very dangerous if it leaks to the outside, and there is a risk of explosion if outside air enters the treatment device, so seals are important for exhaust gas treatment devices.

In addition, converter operation involves the bath pig iron produced in the blast furnace, the receiving process in which the converter is tilted to receive the pig iron, and the smelting process in which the converter and exhaust gas treatment equipment (hood) are opened and sealed to decarburize. process and
After the completion of refining, the process consists of three steps: tapping the hot iron in the converter.

The skirt in the converter exhaust gas treatment equipment is installed to seal the converter and the hood during refining, and when tilting the converter in the pig iron receiving and tapping processes, the entire upper part of the skirt must be removed. At the same time, during refining, the skirt is moved all the way upwards to seal the converter and the hood.

As described above, the skirt needs to be able to move up and down and at the same time be sealed, and these two functions are required.

A sealing device for a skirt portion in a conventional converter exhaust gas treatment device has a structure as shown in FIG.

In the figure, the space between the converter 1 and the hood 2 is sealed by a scar (3).

This skirt 3 is moved up and down by a cylinder 81C.

The seal part of this skirt 3 is provided with a water seal part 4 having a U-shaped cross section on the outer periphery of the skirt 3, and this water seal part is filled with water, and the entire end of the water seal part 4 of the seal tube 6 fixed to the floor 9 is submerged. The skirt 3 was immersed in water to provide both vertical movement and sealing functions for the skirt 3. Note that 5 is a drain groove provided on the outer periphery of the water seal portion 4.

In the conventional skirt sealing device having such a configuration,
Exhaust gas containing a large amount of dust such as iron powder during refining flows from the gap between the hood 2 and the skirt 3 as shown by the arrow, and the dust that leaks until the skirt 3 comes into close contact with the converter 1 also flows as shown by the arrow. The dust that enters the seal part along with the exhaust gas falls into the water seal part 4, or forms a layer on the inner and outer surfaces of the seal cylinder 6, causing the skirt 3 to rise. When this occurs, the dust is washed away by the sealing water and settles to the bottom of the water sealing part 4, forming a dust deposit 7.

If the layer of dust 7 accumulated in this manner becomes high, the tip of the seal cylinder 6 will protrude into the dust accumulation IK, making it impossible for the skirt 3 to rise. the result,
There was a drawback in that the converter could not be tilted, making it impossible to carry out the pig iron receiving and tapping processes, and the converter operation had to be completely suspended.

Furthermore, it is a difficult task to remove the accumulated dust, and it goes without saying that removing this dust requires a great deal of effort.
This method had the disadvantage of completely reducing the operating efficiency of the converter, resulting in large losses.

The present invention was made in view of the above-mentioned conventional dust troubles, and it is an object of the present invention to provide a skirt sealing device that eliminates dust accumulation on the bottom of the water seal.

That is, the present invention solves the dust problem by actively discharging all the dust accumulated at the bottom of the water seal.A water seal having a U-shaped cross section is provided on the outer periphery of the skirt. A drain groove overcoat is provided on the upper outer periphery of the water seal, and a star screw for discharging dust is provided at the bottom of the water seal, and by rotating this screw, the dust accumulated at the bottom of the water seal is removed. It is characterized in that the dust is discharged into a ditch and removed from the drainage ditch together with the water for dust discharge.

An embodiment of the present invention will be described in detail below. In FIG. 2, 1 is a converter, 2 is a hood, and a skirt 3 is constructed to seal the space between them. Reference numeral 4 denotes a water seal portion having a U-shaped cross section provided on the outer periphery of the skirt 3, and a screw 10 having a flexible structure shown in FIG. 5 is disposed at the bottom of the water seal portion.

Note that 5 is a drain, 6 is a seal cylinder, 8 is a cylinder for moving the skirt 3 up and down, and 9 is a floor. Water seal part 4,
In FIG. 3, which shows the relationship between the drain groove 5 and the screws 10 in a plan view, a plurality of screws 10 are arranged along the water seal portion 4 (three screws in this embodiment).

This screw 10 penetrates the outer wall of the water seal part 4, and one end is connected to a motor 11 for rotating the screw 100, and the other end is connected to a motor 11 for rotating the screw 100.
It penetrates the bottom 7 of the drainage ditch 5 and is freely set. As shown in the outline drawing of Fig. 4, a drainage groove 5K is installed from the bottom of the water seal section
A guide casing 12 for the screw 10 is provided, and the screw 10 extends from the bottom of the water seal section 4 to the drain groove 5.
It stands up while bending.

Next, the operation of this embodiment configured as described above will be explained. As shown in FIG. 1, exhaust gas from the converter 1 generated during refining passes through the gap between the hood 2 and the skirt 3 and the gap between the converter 1 and the skirt 3 and enters the seal portion as shown by the arrow.

The dust accompanying this exhaust gas is stored inside the water seal section 4 or
It is applied to the inner and outer surfaces of the seal cylinder 6. The dust layered on the inner and outer surfaces of the seal cylinder 6 is washed away by the vertical movement of the skirt 3 and settles at the bottom of the water seal part 4.

On the other hand, since the screw 10 disposed at the bottom of the water seal section 4 is rotating, the dust settled at the bottom of the water seal section 4 is
The agitated dust with low specific gravity floats and is discharged into the drain groove 5 by overflow water from the water seal section 4, and the dust with high specific gravity is conveyed by the screw 10 and discharged into the drain groove 5. The dust discharged into the drainage ditch 5 is discharged to the outside together with the drainage.

The rotation of the screw is selectively rotated depending on the situation, such as rotation only during refining, rotation only when the skirt 3 is moving up and down, constant rotation, or rotation when a certain amount of dust has accumulated. .

As detailed above, the skirt sealing device of the present invention includes:
A water seal is provided on the outer periphery of the skirt, a drainage groove is provided on the upper outer periphery of this water seal, and a screw is placed at the bottom of the water seal, so that dust that has settled at the bottom of the water seal is completely removed. The skirt can be moved up and down reliably, and the water seal is completely sealed.

As a result, there are no interruptions in the converter operation due to dust troubles, the converter operating efficiency is greatly improved, and there are excellent effects such as eliminating the need for labor-intensive work to discharge dust.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing a conventional skirt sealing device, and FIGS. 2 to 5 show an embodiment of the skirt sealing device of the present invention, and FIG. 2 is a vertical cross-sectional view thereof. figure,
FIG. 3 is a plan view showing the entire relationship among the water seal, drainage groove, and screw, FIG. 4 is an external view of FIG. 2, and FIG. 5 is an external view of the screw. 3...Skirt 4...Water seal part 5...Drain groove 6...Seal cylinder 10...Screw applicant
Kawasaki Heavy Industries, Ltd. Figure 1 Figure 2

Claims (1)

[Claims] A sealing device for a skirt portion of a converter exhaust gas treatment equipment includes: a water seal portion having a U-shaped cross section provided around the outer periphery of the skirt; a drain groove provided on the upper outer periphery of the water seal portion having a U-shaped cross section; The screw located at the bottom of the letter-shaped water seal and
- A seal for the skirt part of a converter exhaust gas treatment equipment, which is characterized by the fact that the screw is rotated, and the dust that accumulates at the bottom of the water seal, which has a U-shaped cross section, is discharged into the drain. Device.