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

A blast furnace, fast technology, applied in blast furnaces, discharge devices, inspection devices, etc., can solve problems such as burning out, poor oxidation resistance, and environmental pollution

Pending Publication Date: 2020-09-01
盐城市联鑫钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 t

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

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0044]Specific implementation method 1. When the furnace is newly opened, that is, when there is no residual iron in the furnace hearth, first use a Ф60mm drill to clean the iron hole channel, and then burn the red coke with oxygen, and then punch 1 grid with water or anhydrous gun mud, and then withdraw the gun Then bury the gun directly. After burying it, add gun mud and compact it, and then turn on compressed air and oxygen, and gradually turn on from small to large. The pressure in the early stage is low and the pressure in the late stage is high. After half an hour, the gas pressure is: oxygen 0.25MPa, compressed air 0.4MPa, no air leakage. When burying the gun, plug the front end of the oxygen gun with a cone of wood. This method of opening the furnace can not draw the gun until the liquid level rises above the iron spout.

specific Embodiment approach 2

[0045] Specific implementation method 2: when the furnace is turned on after the furnace is closed or the hearth is frozen, first use a Ф60mm drill to clean the iron mouth channel, and then burn the red coke with oxygen, and then make 1 grid with water or anhydrous gun mud, and directly after the gun is withdrawn Bury the gun. After burying the gun, add gun mud and compact it, and then turn on compressed air and oxygen, gradually from small to large. The early pressure is low and the late pressure is high. After half an hour, the gas pressure is: oxygen 0.3MPa , Compressed air 0.4MPa, no air leakage, when burying the gun, plug the front end of the oxygen gun with a cone of wood.

specific Embodiment approach 3

[0046] Specific implementation mode three, the method of re-burying the rapid heating device after pulling out the rapid heating device: applicable to the case of freezing of the furnace hearth

[0047] A After the iron is finished, if the channel of the iron hole is large and the fluidity of the slag is good, after the hole is blocked (the amount of mud pumping can not deepen the iron hole, about 0.5 to 1 grid), and the gun is buried immediately after withdrawing the gun for 5 minutes.

[0048] B After the iron is tapped, if the channel of the iron hole is small and the fluidity of the slag and iron is poor, after the blockage is withdrawn, clean up the slag and iron around the iron hole, drill the iron hole with a drill, and block the hole immediately (0.5 to 1 grid of mud) , 5 minutes to withdraw the gun and immediately bury the gun.

[0049] The device and method ensure continuous oxygen supply and reduce the consumption of oxygen pipes; avoid heat loss when replacing oxyg...

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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...

Claims

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Application Information

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IPC IPC(8): C21B7/00C21B7/12C21B7/14C21B7/24C21B5/00
CPCC21B7/00C21B7/12C21B7/14C21B7/24C21B5/00
Inventor 谢锦官谢碧风刁承民陈小平廖运友黄卫孙欢邹宇彬吴从方
Owner 盐城市联鑫钢铁有限公司
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