JPH0212559Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an arc furnace for steelmaking for melting and refining scrap, reduced iron, etc.

[Prior Art] The auxiliary tapping chamber of a conventional steelmaking arc furnace having an auxiliary tapping chamber has an integral structure with the furnace body, and has a single tap opening.

[Problems to be solved by the invention] Therefore, since the auxiliary chamber for tapping cannot be removed and replaced, the arc furnace must be shut down for a long time to repair the refractory lining of the auxiliary chamber for tapping.
The operating rate of the arc furnace had been forced to decline.
In addition, the connecting part between the furnace body and the auxiliary tapping chamber had a large opening, which caused a large amount of heat loss.Furthermore, since there was only one tap opening at the bottom of the auxiliary tapping chamber, the same It was limited to the method of hot spring access.

[Means for Solving the Problems] In order to solve the above-mentioned conventional problems, the present invention provides a removable auxiliary chamber for tapping on the side wall of the furnace body, and also includes a lower surface and a tip of the auxiliary chamber for tapping. There are two hot water outlets on the side.

[Function] Molten metal such as scrap and reduced iron (hereinafter referred to as "molten metal") accumulates at the bottom of the furnace, and slag etc. accumulates in the upper layer of the molten metal.

When only molten metal is tapped, the tap on the side wall of the tip is closed, and the tap on the bottom of the auxiliary chamber for tapping is opened and the furnace body is tilted to tap the melt. When tapping with slag, the tap at the bottom of the auxiliary tapping chamber is closed, and the tap at the side wall of the tip of the auxiliary tapping chamber is opened and the furnace body is tilted in the same manner as described above to tap the hot water.
Since the auxiliary tapping chamber is detachable, it can be easily replaced, and the time during which the arc furnace is shut down for repair of the auxiliary tapping chamber can be shortened.

[Examples] Examples of the present invention will be described below with reference to the drawings. The figure shows an embodiment of the present invention, in which an auxiliary chamber 4 for tapping is removably attached to the side wall 2 of the arc furnace main body 1 with a tightening tool 3 such as a bolt or bolt, and the lower surface of the auxiliary chamber for tapping is attached. Tape ports 5, 5' are provided on the tip side, and a conventionally known filling material is filled only in the tap port that is not used and closed with a lid 6, 6'.
Further, the top opening 7 of the auxiliary tapping chamber 4 is provided with a lid 8 that can be opened and closed to prevent heat loss, prevent oxidation of the molten metal, and ensure safety. In addition, 9 is an electrode, 10
is the arc, and 11 is the hearth line.

When only the molten metal constructed as described above is to be tapped, the tap 5' is filled with a filler to block it, the lid 6 of the tap 5 is opened, and the furnace body 1 is tilted by conventional means to tap the melt. If the molten metal and slag are to be tapped together, the tap 5 is closed, the lid 6' of the tap 5' is opened, and the furnace body is tilted in the same manner as described above.
When repairing the refractory lining of the hot water auxiliary room 4,
If the fastener 3 between the auxiliary tapping chamber 4 and the furnace body 1 is removed, the auxiliary tapping chamber will be separated from the furnace body 1, so if a separate auxiliary chamber for tapping is prepared, it will save time. It can be replaced in time. Even if a spare auxiliary tapping chamber is not prepared, the auxiliary tapping chamber can be separated from the furnace main body, so the lining refractory can be repaired easily and safely.

Note that the steelmaking arc furnace of the present invention is not limited to the above-described embodiment, and the tap outlet of the auxiliary chamber for tapping may be blocked using a conventionally known closing device such as a valve or a stopper rod that can be used continuously. It goes without saying that various changes, such as closing, can be made without departing from the gist of the present invention.

[Effects of the invention] As described above, in a steelmaking arc furnace equipped with an auxiliary chamber for tapping on the side wall of the furnace body, the tap opening is provided on the lower surface of the auxiliary chamber and on the side of the tip. According to the invention, when selecting and using either tapping of molten metal only or tapping of molten metal accompanied by slag, it is possible to switch over and use it very easily. Furthermore, by attaching the auxiliary tapping chamber to the furnace body in a removable manner and providing a lid that can be opened and closed at the upper opening of the auxiliary tapping chamber, it is possible to shorten the time when the arc furnace is shut down for repairs to the auxiliary tapping chamber. As a result, the operation rate is improved, and therefore productivity is improved, and various excellent effects are exhibited, such as prevention of heat loss, prevention of oxidation of molten metal, and improvement of safety.

[Brief explanation of the drawing]

The drawing is an explanatory view of one embodiment of the steel-making arc furnace of the present invention. 1 is the furnace body, 3 is the tightening tool, 4 is the auxiliary room for tapping,
Reference numerals 5 and 5' indicate a tap opening, 6 and 6' a tap cover, and 8 a lid that can be opened and closed.

Claims (1)

[Scope of utility model registration request] 1. An arc furnace for steel making comprising an auxiliary chamber for tapping on the side wall of a furnace body, characterized in that a tapping port is provided on the lower surface of the auxiliary chamber and on the side surface of the tip.