JPH10183223A - Converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a converter which can be emptied as perfectly as possible without accompanying flow-out of slag. SOLUTION: In the converter 1, a closing mechanism, particularly a sliding gate nozzle 1 is arranged in a molten metal discharging passage 4. In such a case, in order to prevent the flow-out of molten metal together with the slag N at the time of tapping the molten metal, an inlet vessel 9 is constituted in the front of the molten metal discharging passage 41 and the cross sectional area (a) thereof is larger than the cross sectional area of the molten metal discharging passage 4 and remarkably smaller than the cross sectional area (c) of the converter 1. At the molten metal discharging position of the converter 1, the inlet vessel 9 forms a staying space at the upper part from the sliding gate 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a converter in which a closing mechanism, particularly a sliding gate nozzle, is provided in a molten metal outlet passage.

[0002]

2. Description of the Related Art In a converter, in order to obtain high quality of steel, it is desirable that slag does not flow out at the time of tapping, especially at the end of tapping.

In order to prevent the slag from flowing out, according to the prior art, a slag detector is provided at the hot water passage, and when the slag reaches there, the slag detector closes the closing mechanism. In a conventional type of converter, slag is already entrained into the tap passage before the converter is empty. The closing mechanism is then closed by the slag detector. In practice, the closing mechanism is closed and opened several times during tapping. This repetitive operation of the closing mechanism reduces its life, especially with sliding gate nozzles, because each movement of the sliding gate nozzle involves wear.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a converter which can be emptied as completely as possible without a joint outflow of slag.

[0005]

According to the present invention, there is provided a converter wall having a cross section larger than a flow cross section of a tapping passage and significantly smaller than a cross section of a converter in a range of an opening of a tapping passage. An inlet tank having a molten metal is formed, and a stagnation space for the molten metal is formed above the closing mechanism at a tapping position of the converter.

At the time of tapping, molten steel stays in the inlet tank, and the molten metal does not flow directly from the inner space of the converter to the tapping passage, but
It flows to the hot water passage through the inlet tank. The slag is on the molten surface above the inlet tank, which is small compared to the converter interior space.

[0007] The inlet tank maintains a relatively high melt surface and slag-free melt volume above the closing mechanism even at the end of the tap. The slag stays above the inlet tank away from the closing mechanism by an interval that is increased by the depth of the inlet tank until the inlet tank itself is empty. The slag can reach the inlet tub only when residual bath water in the inlet tub begins to flow.
Thereby, the slag can be prevented from flowing out through the tapping passage until the converter is almost completely empty.

In connection with the slag detector provided at the tapping passage, the slag detector does not detect the slag prematurely, and therefore has to be detected early before the tapping ends, ie before the converter is empty. The closing mechanism is not closed. As a result, only one closing step of the closing mechanism is required for the tapping process of the converter, especially if the closing mechanism is a sliding gate nozzle with a refractory ceramic sliding plate, the life of the closing mechanism is increased. .

Advantageous configurations of the invention emerge from the dependent claims and the following description of the exemplary embodiments.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A converter 1 is swingably supported about an axis 2 from a filling position (see FIG. 1) to a tapping position (see FIG. 2). A tapping passage 4 is formed in the converter wall 3 which stands substantially vertically at the filling position and substantially horizontally at the tapping position. A sliding gate nozzle 6 made of a hole-resistant ceramic sliding plate is provided in the tapping path 4 outside the converter internal space 5.

A slag detector 7 is provided at the hot water passage 4 to detect the slag in the hot water passage 4 and close the sliding gate nozzle 6 via an electronic control circuit (not shown).

An inlet tank 9 is formed in the converter wall 3 in the range of the opening 8 of the hot water passage 4 facing the converter internal space 5. The cross section “a” of the inlet tank 9 is larger than the flow cross section “b” of the hot water supply passage 4 and is located above the converter wall 3 (see FIG. 2).
Is significantly smaller than the cross section c. The width B of the inlet tank 9 as seen from FIG. 2 is about 80 to 100 cm. The depth T of the inlet tank 9 is at least about 60 to 80 cm.

At the tapping position (see FIG. 2), the converter wall 3
Is gently inclined toward the inlet tank 9. Inlet tank 9
From the gentle slope to the bottom 11 with the opening 8 due to the steep side 10. The side surface 10 tapers conically from the converter wall 3 toward the bottom 11 or the opening 8.

The operation of the converter described above is as follows for the inlet tank 9. When the converter 1 is swung to the tapping position in FIG. 2 with the sliding gate nozzle 6 opened, the slag-free molten steel S stays in the inlet tank 9, and passes from the inlet tank 9 through the tapping passage 4. leak. There is slag N above the molten metal surface M above the inlet tank 9. Slag N is still at the end of bath 9
The slag N cannot reach the hot water passage 4 because it stays outside.

Only when the converter S has completely flowed from the converter wall 3 into the inlet tank 9, the slag N can reach the upper edge 12 of the inlet tank 9, with most of the slag N 3 remains on.

Finally, when the inlet tank 9 is also emptied of the small residual space in the stagnation space of the converter wall 3, the slag N in the hot water passage 4 can reach the slag detector 7, and With almost empty condition, the slag detector 7 now closes the sliding gate nozzle 6.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a converter at a filling position.

FIG. 2 is an enlarged vertical sectional view of a part of a converter at a tapping position.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Converter 3 Converter wall 4 Hot water outlet passage 8 Opening 9 Inlet tank a Cross section of inlet tank b Cross section of hot water passage c Cross section of converter

Claims (7)

[Claims] An opening (8) of a tapping passage (4) in which a closing mechanism is provided in a tapping passage for molten metal of a converter.
In the converter wall (3), an inlet tank (9) having a cross section (a) larger than the flow cross section (b) of the tapping passage (4) and significantly smaller than the cross section (c) of the converter (1) is provided in the range (1). A converter, wherein the converter has a molten metal retention space above the closing mechanism (6) at a tapping position of the converter (1). 2. Converter according to claim 1, characterized in that the inlet tank (9) tapers conically towards the tapping passage (4). 3. The converter according to claim 1, wherein the depth (T) of the inlet vessel (9) is at least about 60 to 80 cm. 4. The method as claimed in claim 1, wherein the width (B) of the inlet tank (9) is about 80 to 100 cm.
A converter according to one of the above. 5. The roll-over according to claim 1, wherein a slag detector is provided at the tapping passage to control the closing mechanism. Furnace. 6. A converter wall (3) at an outlet tank (9) at a tapping position.
6. Converter according to one of the claims 1 to 5, characterized in that it is gently tilted towards it, whereas the side (10) of the inlet tank (9) drops steeply. 7. The method according to claim 1, wherein the bottom (11) of the inlet tank (9) is shifted to the opening (8) of the hot water passage (4).
A converter according to any one of claims 1 to 6.