JPH10237534A - Device for oxygen-cleaning plug for gas blowing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To regenerate a plug by cleaning and removing the stuck metal and slag without damaging the plug, by controlling oxygen quantity with two steps while adjusting a valve with a flow rate monitor and a sensor, at the time of cleaning by oxygen blowing the working surface of the plug for gas blowing into a ladle, etc., for metallurgy. SOLUTION: In the case the inner diameter of the plug 9 is reduced by solidifying and sticking of the metal and the slag onto the working surface 10 of the plug 9 for gas blowing into a molten metal refining vessel, an oxygen introducing pipe 8 is inserted into the working surface 10 of the plug 9, and the metal and the slag are melted and removed by blowing oxygen to regenerate the plug 9. In this case, firstly, ignition is executed to the working surface 10 of the plug 9 by adjusting a control valve 4a with the flow rate adjusting monitor 5. When the spark spatters from the tip part of the plug, the spark is sensed with a sensor 3a, and a valve 4a is automatically closed and the oxygen quantity is controlled by adjusting a valve 4b through a monitor 5b, and the metal, slag, etc., of the working surface 10 of the plug 9 are melted and removed to execute oxygen-cleaning of the plug 9 for passing through the necessary gas flowing quantity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oxygen cleaning apparatus for a gas injection plug used in a metallurgical ladle.

[0002]

2. Description of the Related Art In refining a molten metal, a gas is generally blown into the molten metal. A gas injection plug is used on the wall or bottom of the metallurgical ladle for this refining.This gas injection plug is used many times, so the metal or metal on the working surface of the gas injection plug is used. Oxygen cleaning is performed to remove deposits such as slag, and the gas flow rate of the gas injection plug is restored.

[0003]

SUMMARY OF THE INVENTION
Generally, the ladle is tilted, and the lance pipe for oxygen cleaning is inserted from the upper side of the ladle to the vicinity of the operating surface of the gas injection plug, and oxygen gas is blown directly to the operating surface of the gas injection plug. Oxygen cleaning.

When the lance pipe for oxygen cleaning is inserted into the ladle, the pipe bends due to the radiant heat of the ladle, which makes it difficult to intensively clean the working surface of the gas injection plug, and also cleans the tuyere brick. As a result, the life of the gas injection plug and the tuyere brick is shortened.

[0005]

According to the present invention, oxygen cleaning of a gas injection plug operating surface is performed by drawing oxygen gas from a gas injection plug main body through a gas introduction pipe of the gas injection plug. Gas injection plug operating surface 10
This is an oxygen cleaning device A for gas injection that enables only the oxygen cleaning.

[0006] The apparatus of the present invention comprises a flow control monitor 5a, 5
b, flow rate sensors 3a, 3b, flow rate control valves 4a, 4b, and the like. The flow rate adjustment monitor 5a is controlled in advance by the size of the gas blowing plug and the amount of permeation of metal or the like on the operating surface 10. Set the flow rate of oxygen gas and measure the flow rate of oxygen gas with the flow sensor 3
a, and controlled by the flow control valve 4a, oxygen is supplied from the gas injection plug body 9 to the gas injection plug operating surface 10 through the gas injection pipe 8 of the gas injection plug connected to the apparatus. By supplying and injecting, the gas injection plug operating surface 10 ignites,
The gas sparks and flows over the plug surface. This is detected by the flow rate sensor 3a, the flow rate adjustment monitor 5a closes the flow rate control valve 4a, opens the flow rate control valve 4b, and when the flow rate control valve 4b is opened, the gas injection plug originally set in the flow rate adjustment monitor 5b is set. The gas flow required by the flow sensor 3
b, and controlled by the flow control valve 4b, it is possible to clean metal and slag and other permeates and deposits only on the operating surface 10 of the plug 9, and when the flow rate returns to the set flow rate, the flow rate sensor 3b detects it. As a result, the return of the gas flow rate of the gas injection plug can be recognized, and the end point of the oxygen cleaning can be determined. Thus, the oxygen cleaning can be automatically terminated, and the conventional problems can be solved.

[0007]

The present invention will be described more specifically with reference to the following examples. Using the oxygen injection device A for a gas injection plug according to the present invention, oxygen cleaning of the gas injection plug operating surface 10 used in a ladle for 150T metallurgy was performed. After the residual hot water is discharged, the flow rate adjustment monitors 5a and 5b, the flow rate sensors 3a and 3b, and the flow rate control valves 4a and 4
b, etc., the oxygen gas inlet 1 of the oxygen cleaning device is connected to the oxygen gas supply device, while the oxygen gas hose 7 from the oxygen gas outlet 6 of the device is connected to the gas attached to the ladle. It is connected to the gas introduction pipe 8 of the blowing plug to communicate oxygen gas. In consideration of the size of the plug for gas injection used in the ladle for 150T metallurgy, etc., the flow rate for igniting the operating surface 10 for gas injection is determined in advance by the flow rate monitor 5a. To 6 kg / cm ² and oxygen gas injection flow rate to 3
The flow rate required for the most use of the gas blowing plug is set to 0 l / min, and the flow rate monitor 5b sets the oxygen gas blowing pressure to 6 kg / cm ² and the oxygen gas blowing flow rate to 400 l / min. Set. First, a spark is scattered from the tip of the gas injection plug, which is controlled by the flow rate control valve 4a from the flow adjustment monitor 5a and ignites the gas injection plug operating surface 10.
When the flow rate of 1 flows, the flow rate sensor 3a senses, the flow rate control valve 4a is automatically closed, and the flow rate control valve 4b is controlled by the flow rate adjustment monitor 5b to control the gas injection plug operating surface 10 with metal, slag and deposits. Was removed, and cleaning with oxygen gas was performed to restore the gas flow rate. The flow rate sensor 3b sensed that the flow rate had returned to 400 l / min set by the flow rate adjustment monitor 5b in 7.6 seconds, and the flow rate control valve 4b
Was automatically closed, and the end point of the oxygen cleaning could be reliably determined.

[0008]

According to the present invention, oxygen gas can be reliably supplied to the tip of the gas injection plug in two stages by supplying oxygen gas to the tip of the gas injection plug, and only the tip of the gas injection plug can be minimized. After washing, the end point of washing could be determined. Therefore, the gas blowing plug can be reused and used more frequently.

[Brief description of the drawings]

FIG. 1 is a conceptual explanatory view of an apparatus of the present invention.

[Explanation of symbols]

 A Oxygen cleaning device 1 Oxygen gas inlet 2 Flow meter 3a Flow sensor 3b Flow sensor 4a Flow control valve 4b Flow control valve 5a Flow control motor 5b Flow control motor 6 Oxygen gas outlet 7 Connection hose 8 Gas inlet pipe 9 Gas injection Plug body 10 Gas injection plug operation surface

Claims (4)

[Claims] In order to perform oxygen cleaning of the operating surface of the gas injection plug, oxygen gas is supplied to the operating surface of the gas injection plug through a gas introduction pipe of the plug to perform the oxygen cleaning. Oxygen cleaning device for gas injection plug. 2. A flow rate adjusting monitor, a flow rate sensor, a flow rate control valve, and the like, wherein the minimum flow rate of oxygen gas required to ignite a gas injection plug operating surface is set by the flow rate adjusting monitor. Then, the flow rate of oxygen gas is sensed by the flow rate sensor, the flow rate control valve is controlled in accordance with the set flow rate, oxygen gas is supplied to the gas injection plug operating surface through the gas introduction pipe, and it is possible to ignite. Claim 1.
An oxygen scrubbing device for a gas injection plug according to item 1. 3. The flow control monitor according to claim 2, wherein after igniting the plug operating surface, the gas injection plug returns to a gas flow necessary for injecting gas into the molten metal.
3. The oxygen cleaning apparatus for a gas injection plug according to claim 1, wherein oxygen is supplied and oxygen cleaning is performed by adjusting a flow rate sensor and a flow rate control valve. 4. The oxygen cleaning apparatus for a gas injection plug according to claim 1, wherein an end point of the oxygen cleaning can be determined.