Method and device for promoting rapid temperature rise of blast furnace hearth

Abstract

The invention relates to the technical field of blast furnaces, in particular to a method and device for promoting rapid temperature rise of a blast furnace hearth. The device comprises a sleeve, a low-pressure oxygen joint, a compressed air joint and a tapping machine shank; the front portion of the sleeve extends into the blast furnace hearth from a blast furnace tap hole, the position between the front portion of the sleeve and the blast furnace tap hole is filled with a sealing material, the sleeve comprises an inner sleeve body and an outer sleeve body, and blind plates are fixedly arranged at the ends of the inner sleeve body and the outer sleeve body to block the inner sleeve body and the outer sleeve body; the low-pressure oxygen joint and the compressed air joint are fixedly arranged at the rear portion of the sleeve and positioned outside the blast furnace tap hole, wherein the low-pressure oxygen joint penetrates through the outer sleeve body to extend into the inner sleevebody, and the compressed air joint extends into a gap between the outer sleeve body and the inner sleeve body; and the tapping machine shank is fixedly connected to the rear end of the sleeve and provided with an external thread. According to the device and method, the continuous oxygen supply and the reduce the consumption of oxygen steel pipes can be ensured, and the quick temperature rise and the environmental protection are realized.

Description

technical field [0001] The invention relates to the technical field of blast furnaces, in particular to a method and device for rapidly raising the temperature of a hearth of a blast furnace. Background technique [0002] Blast furnaces often have hearth freezes, start-ups after long-term closures, such as resumption of production after environmental protection restrictions, resumption of production after closures during the epidemic, etc., and new start-ups, including new builds and start-ups after major and medium repairs, especially Accidents such as hearth freezing or great cold caused great losses to various enterprises, and secondary losses were caused by improper handling or excessive processing time during the recovery process. In the prior art, when the blast furnace is opened or the hearth is frozen, the oxygen pipe with a diameter of 6 minutes (DN20) is usually used manually to feed oxygen (oxygen pressure 0.4MPa~0.6MPa) and gradually burn oxygen from the iron hol...

AI Technical Summary

Problems solved by technology

The oxygen pressure is 0.4MPa~0.6MPa. When the remaining length of the oxygen welded pipe is close to the safe distance, replace the new oxygen welded pipe and continue to burn oxygen. Not only the labor load is large, the effect is poor, the cost is high, the time is long, and there is certain pollution to the environment. Moreover, it is often difficult to get through the iron hole and the tuyere, which restricts the rapid recovery of the furnace condition, increases the production cost of the enterprise and has a large production safety hazard. Connected, the slag and iron formed in the tuyere cannot be discharged from the iron hole, and there is a risk of burning out from the tuyere, etc.

The reason is that the oxygen pipes used are all welded pipes made of Q235 material, which have poor oxidation resistance and low melting point, which lead to non-burning resistance, and cannot form continuous oxygen burning for a long time, resulting in the inability to accumulate heat quickly.

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