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Method for precisely determining coal injection rate during blowing-down and blowing-in periods of blast furnace

A technology of coal injection and blast furnace, which is applied to blast furnaces, blast furnace details, furnaces, etc., and can solve problems such as the inaccurate calculation of blast furnace coal shortage

Active Publication Date: 2015-05-06
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of this invention is to overcome the defect that the lack of coal in the blast furnace cannot be accurately calculated in the past, and provide a new method for accurately determining the amount of coal injection during the blast furnace shutdown period, so as to improve the precise control of the fuel ratio when the blast furnace is shut down.

Method used

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  • Method for precisely determining coal injection rate during blowing-down and blowing-in periods of blast furnace
  • Method for precisely determining coal injection rate during blowing-down and blowing-in periods of blast furnace
  • Method for precisely determining coal injection rate during blowing-down and blowing-in periods of blast furnace

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Experimental program
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Effect test

Embodiment 1

[0034] At 7:00 on a certain day, the fan supplies air with an air volume of 1000m 3 / min, at 8:00 the air release valve is closed, that is, the air volume enters the blast furnace, and the atmospheric humidity is 8g / m at this time 3 , humidification steam 1t, oxygen enrichment volume is 0, and the air volume has been increased to 3000m by 9:00 3 / min, there is no coal injection before 9:00, the target coal ratio is 180kg / tfe, and the fuel ratio is 530kg / tfe, so how much coal is missing from 8:00 to 9:00? Conditions Pulverized coal contains 70% carbon, and coke contains 87% carbon. The process is as follows:

[0035] 1. Execute the steps (1) to (4) of the plan, and count the coal ratio, fuel ratio, output, air oxygen volume, humidification, etc. during normal production. If the average value of four days of normal production is counted: the air volume is 6600m 3 / min, oxygen enrichment 20000m 3 / h, humidification 3t / h, coal injection wind 5000m 3 / h, coal ratio 200kg / tfe, f...

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Abstract

The invention discloses a method for precisely determining the coal injection rate during blowing-down and blowing-in periods of a blast furnace; mutual influence of the various parameters, such as a coal ratio, a fuel ratio, the air volume, oxygen enrichment, humidification, crude fuel components, the yield and the like, is counted; furthermore, the mutual influence is digitized; furthermore, existing molten iron temperature measurement and the silicon content of molten iron are also considered; after the influence factors are quantified, wind consumption per ton of iron and a carbon consumption base point as references are calculated; and the coal loss amount is automatically calculated after a real-time data accumulated value during blowing-down, blowing-in and dead back periods is compared and calculated with the references according to a control object.

Description

technical field [0001] The invention relates to a method for accurately determining the amount of coal injection during the off-air supply period of a blast furnace, and belongs to the field of ironmaking technology. Background technique [0002] After the blast furnace is put into production, it is often shut down due to equipment, logistics or scheduled inspections. Coal injection is not required at the end of each wind shutdown or in the early stage after blast furnace operation, and the fuel ratio of the wind shutdown or blast materials is planned to be controlled, which is different from the fuel ratio of normal production. The fuel ratio has a certain level Coal ratio, that is, fuel ratio = coke ratio + coal ratio. If there is no coal injection, there will be a lack of fuel (coal ratio). When the blast furnace can accept coal injection, the blast furnace operator must make up the amount of coal that was lacking when no coal injection. Since the amount of air oxygen i...

Claims

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Application Information

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IPC IPC(8): C21B5/00
Inventor 郑伟赵新民刘文文唐顺兵
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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