Converter oxygen lance blowing control method based on dry dedusting process

A converter oxygen lance and dry dust removal technology, which is applied in the manufacture of converters, etc., can solve the problems that the dry dust removal converter blowing control technology has not yet been reported.

Inactive Publication Date: 2011-04-13
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the primary problem of the converter steelmaking process equipped with dry dust removal is the safe operation of the electrostatic precipitator, that is, it is necessary to seek a new type of converter steelmaking O 2 The blowing method can effectively suppress or regulate the O in the flue gas 2 and CO content, so that its changes are limited within the range that ensures the safe operation of the dust collector
[0004] Among the domestically developed converter control systems, dry dust removal converter blowing control technology has not yet been published

Method used

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  • Converter oxygen lance blowing control method based on dry dedusting process
  • Converter oxygen lance blowing control method based on dry dedusting process

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Embodiment Construction

[0018] The classic converter blowing control process is based on the preset valve position of the oxygen regulating valve, which is directly input into the valve regulator PI for automatic adjustment. As a result of this control, the O entering the furnace at the beginning of blowing 2 Too late to be oxidized by molten iron (Fe 3 o 4 =2O 2 +3Fe) leads to O in the flue gas 2 The content is relatively large. This has no major impact on traditional wet dust collection. However, for dry dedusting process with ESP, high O 2 Concentrated flue gas passing through the electrostatic precipitator will cause the risk of explosion venting accidents, making steelmaking unable to proceed normally. After the initial stage of blowing, the amount of oxygen blowing in the steelmaking furnace reaches the set value, the oxidation-reduction reaction in the furnace tends to be stable, and the oxygen in the flue gas 2 The content decreases and maintains a certain value, which has no effect o...

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Abstract

The invention relates to a converter oxygen lance blowing control method based on the dry dedusting process. The method comprises the following steps: when a converter oxygen lance begins to blow or begins to blow, then stops normally and continues to blow, the opening of an oxygen regulating valve is controlled to 50-70% for a certain time and a feeding valve actuator performs automatic regulation; when the converter oxygen lance re-blows in the back stage of the blowing, the oxygen regulating valve is preset to have an automatic initial valve opening and then the feeding valve actuator performs automatic regulation; and when the converter oxygen lance is interrupted by a fault and blows again, the opening of the oxygen regulating valve is fast controlled to 75%-85% for a certain time and the feeding valve actuator performs automatic regulation. By adopting the invention, the contents of O2 and CO in the fume gas can be effectively inhibited or controlled, the changes of the contents are limited within a safe operation range of the deduster and the safe operation problem of the main devices for dry dedusting is solved.

Description

technical field [0001] The invention relates to a converter oxygen lance blowing control method for a dry dust removal process in converter steelmaking. Background technique [0002] Dry dust removal is a new type of dust removal process in converter steelmaking in recent years. The dry dedusting process uses nitrogen or steam to atomize the flue gas produced by steelmaking through a special annular nozzle at the flue venturi to produce coarse ash precipitation, which is collected and transferred. After removing the coarse ash, the flue gas is drawn into the high-voltage electrostatic precipitator for fine dust filtration. After passing through the switching station, the qualified flue gas (coal gas) is sent to the gas cabinet for recovery. The unqualified flue gas is exported and burned through the chimney. [0003] Different from the traditional wet dedusting, the main equipment of dry dedusting is the high-voltage electrostatic precipitator for O in the converter flue...

Claims

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Application Information

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IPC IPC(8): C21C5/30C21C5/40
Inventor 陈炼
Owner WUHAN IRON & STEEL (GROUP) CORP
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