Method for preventing electric precipitation detonation discharge of top and bottom blown converter

A technology of top-bottom blowing and electrostatic precipitator, which is applied in the manufacture of converters, etc., can solve the problems of long waiting time, increased probability of explosion venting, damage to the cathode line and anode plate of electrostatic precipitator, etc., and achieves the effect of slowing down the generation speed.

Active Publication Date: 2010-01-06
SHANXI TAIGANG STAINLESS STEEL CO LTD
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AI Technical Summary

Problems solved by technology

[0002] At present, most of the top-bottom combined-blowing converters use the dry gas recovery process of electric precipitator. When it explodes, it will cause damage to the cathode line and anode plate inside the electrostatic precipitator, and after the explosion is vented, the converter must wait for more than five minutes before blowing again.
If the waiting time is too long after explosion venting, it may even cause the continuous casting to break

Method used

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Examples

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Embodiment Construction

[0011] Trial in Taiyuan Iron and Steel (Group) Co., Ltd. smelting steel J55-1, furnace number B1901364. The Si content of the molten iron is 1.355%, the double slag operation of the converter, blowing oxygen until the Si content of the molten iron is 0.40% (weight percentage), lift the lance to dump the slag, and adjust the oxygen flow rate to 300Nm when the oxygen lance is lowered for the second time 3 / min, after observing the ignition, add 500Kg of lime to the high-level silo, and observe the CO and O in the flue gas analyzer at the hot end of the flue on the blowing screen 2 The content change, such as O in the flue gas 2 When the content drops below 5%, increase the oxygen flow rate to 450Nm3 / min, then increase the oxygen flow rate to 650Nm3 / min after 13 seconds, and blow normally until the end. The furnace is a typical high-Si double slag operation, because it is operated strictly in accordance with the explosion-proof standard, so no explosion-vented. Taiyuan Iron and...

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PUM

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Abstract

The invention relates to a method for preventing the electric precipitation detonation discharge of a top and bottom blown converter, which aims at protecting an electric precipitation device and saving the melting time and is suitable for a top and bottom blown converter with electric precipitation function. The method for preventing electric precipitation detonation discharge of a top and bottom blown converter comprises the following steps: pumping flue gas generated by charging the converter; normally blowing; controlling the Si content which is not less than 0.15 percent by weight in molten iron when an oxygen lance is firstly lifted to deslag; manually regulating the oxygen flow rate to 50 percent of a normal flow rate so as to blow and smelt when the oxygen lance is secondly deslagged; adding lime about 500kg after the ignition is successful; observing the content variation of CO and O2 in a flue gas analyzer which is arranged on the heat end of a flue on a blowing picture so as to increase the oxygen flow rate step by step; increasing the oxygen flow rate to 450Nm3 / min after the oxygen content is reduced to below 5 percent in volume percentage; maintaining the oxygen flow rate for 10-15 seconds; and finally increasing the oxygen flow rate to 650Nm3 / min so as to normally blow and smelt.

Description

technical field [0001] The invention relates to a method for avoiding the explosion venting of the electric dust collector of the top-bottom combined blowing converter, and reducing the loss of equipment and smelting time caused by the explosion venting. Background technique [0002] At present, most of the top-bottom combined-blowing converters use the dry gas recovery process of electrostatic precipitator. When it explodes, it will cause damage to the cathode line and anode plate inside the electrostatic precipitator, and the converter must wait for more than five minutes before blowing again after blowing, and the probability of blowing will increase greatly when blowing again. If the waiting time is too long after the explosion venting, it may even cause the continuous casting to break. Contents of the invention [0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, and provide a method for preventing electric d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/40
Inventor 陈景锋谢彦明牛爱兵
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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