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Detecting and analyzing method of unburned coal powder content in blast furnace dust

A blast furnace and pulverized coal technology is applied in the field of detection of unburned pulverized coal in blast furnace dust, which can solve the problems of not being able to distinguish the content of furnace dust, not being able to quantitatively distinguish the source of carbon, and failing to grasp the characteristics of coke in the furnace dust.

Inactive Publication Date: 2003-04-30
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
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Problems solved by technology

However, neither the measurement of the particle size distribution nor the testing of the sieve particle size analysis can quantitatively distinguish the origin of different types of carbon in blast furnace secondary ash and gravity ash
[0006] Chemical analysis methods can only give the total carbon content in the sample, but cannot distinguish between two different sources of carbon
[0007] The number point method in petrographic analysis can determine the surface ratio of coke and unconsumed coal, but cannot determine the respective carbon content
[0008] The method used above does not capture the characteristics of coke and unconsumed coal in the dust, and cannot be used to distinguish the two carbon contents in the dust

Method used

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Embodiment Construction

[0014] The present invention carries out petrographic analysis on the blast furnace dust sample from the angles of two different professions of metallurgy and coal coke. The metallurgical specialty has a finer classification of iron-containing substances, and the coal coke specialty has a finer classification of the coking structure. They only have different emphases, which do not affect the proportion of the final coke and unconsumed coal. They can be used to determine blast furnace dust The content of unconsumed pulverized coal in the After determining the content of unconsumed pulverized coal in blast furnace dust, the consumption rate of pulverized coal in the furnace can be given by the amount of dust per ton of iron.

[0015] The surface of the unconsumed coal powder in the furnace dust has different degrees of burning loss, which must be corrected. Under a high power microscope, the image of the photo is only 1cm 2 It is not easy to determine the amount of burning los...

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Abstract

A method for detecting the content of unburnt coal powder in the dust of blast furnace includes such steps as finding out the total content of carbon in specimen by chemical analysis, determining thesurface area ratio of coke and unburnt coal, finding out their weight percentages, determining respective carbon content, and adding 20-40 % as correcting coefficient.

Description

Technical field: [0001] The invention belongs to the field of blast furnace ironmaking, and is particularly suitable for detecting unburned coal powder in blast furnace dust. Background technique: [0002] The amount of dust and the carbon content in the dust will increase after the blast furnace is blown up. In order to determine the utilization rate of blast furnace pulverized coal injection, it is necessary to detect the content of unconsumed pulverized coal in the furnace dust. [0003] The X-ray diffraction test method in the prior art only gives diffraction peaks to substances with a crystal structure. However, C in coke and unconsumed pulverized coal can exist in amorphous form, and X-ray diffraction is not suitable for detecting the content of unconsumed pulverized coal. [0004] The high-temperature combustion test burns the carbon-containing substances in the furnace dust, and analyzes the generated gas at the same time. Although the fastest burning rates of the...

Claims

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Application Information

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IPC IPC(8): C21B7/24G01N33/00
Inventor 徐万仁吴铿左兵吴淑华李肇毅姜伟忠钱晖
Owner BAOSHAN IRON & STEEL CO LTD