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A Method for Adjusting the Erwen Throat of Converter

An adjustment method and throat technology, which is applied in the manufacture of converters, etc., can solve the problems of heavy maintenance workload of the micro-differential pressure detection system and the inability to guarantee the accuracy of the micro-differential pressure detection value, so as to improve the dust removal effect and gas recovery rate and the effect of prolonging the recovery time

Active Publication Date: 2019-12-13
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the daily maintenance workload of the micro-differential pressure detection system is heavy, especially the slag accumulation must be cleaned and purged frequently for the pressure-taking pipeline, otherwise the accuracy of the micro-differential pressure detection value cannot be guaranteed; so how to ensure the micro-differential pressure detection system Reliability and stability become the premise and bottleneck of this technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In this embodiment, the oxygen blowing system and Erwenhou RD valve are interlocked and controlled by the control system. The oxygen amount adjusts the opening of the RD valve step by step, so as to improve the flue gas treatment and dust removal effect, prolong the gas recovery time, and improve the gas recovery rate without adding other equipment.

[0030] 1) Before the start of oxygen blowing, the RD valve opening is controlled at 40% during the process of adding iron and steel scrap to the converter; the data of molten iron and steel scrap is collected, and the oxygen blowing amount of the furnace is statically calculated to be 14550m 3 .

[0031] 2) After oxygen blowing starts, the opening of the RD valve is controlled at 50%.

[0032] 3) The amount of oxygen blowing reaches 2910m 3 (20% of the total oxygen), the RD valve opening is controlled at 90%.

[0033] 4) The amount of oxygen blowing reaches 10913m 3 (75% of the total oxygen), the RD valve opening is cont...

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PUM

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Abstract

The invention relates to a converter second-stage venturi throat regulation method. According to the converter second-stage venturi throat regulation method, when iron and waste steel are added, the RD valve opening degree is controlled at 40-50%; before the oxygen blowing amount achieves 20%, the RD valve opening degree is controlled at 50-60% at a silicon-manganese oxidation stage; when the oxygen blowing amount achieves 20-75%, the RD valve opening degree is controlled at more than 90% at a carbon-oxygen intense oxidation stage; 4) after the oxygen blowing amount achieves 75%, the RD valveopening degree is controlled at 65-75%; after a sublance test process is started, the RD valve opening degree is controlled at 50-60%; and after the oxygen blowing is ended, the RD valve opening degree is controlled at 40-50%. According to the present invention, the opening degree of the second-stage venturi throat is automatically regulated according to the carbon-oxygen reaction and the flue gaschange law during the converter smelting, and under the premise of no additional arrangement of other equipment, by reducing the air introduction at the early stage and the late stage of the smeltingand the flue gas overflow burning at the middle stage, the effects of dust removing improving, coal gas recovery time prolonging and coal gas recovery improving can be achieved.

Description

technical field [0001] The invention relates to the technical field of converter gas recovery, in particular to a method for adjusting the Erwen throat of a converter using a one-tower Shuangwen wet dust removal system. Background technique [0002] The main purpose of converter smelting is to remove Si, Mn, C, P and other impurity elements and harmful gases in molten iron, and adjust the composition and temperature of molten steel. The oxygen blowing process of the converter is mainly divided into three stages: one is the early stage of oxygen blowing, also known as the silicomanganese oxidation period, the main reaction is that the silicon manganese in molten iron reacts with the blown oxygen to form SiO 2 , MnO and other oxidation products enter the slag, and only a small amount of carbon is oxidized. During this period, the amount of flue gas generated is small, and the main component of flue gas is N 2 . The second is the middle period of oxygen blowing, also known as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/38
Inventor 牛兴明马宁刘文飞王鲁毅徐国义尹宏军王富亮赵自鑫
Owner ANGANG STEEL CO LTD
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