A Method for Quantitatively Evaluating Blast Furnace Hearth Activity Index

Abstract

The invention belongs to the technical field of blast furnace ironmaking, and relates to a method for quantitatively evaluating the activity index of a blast furnace hearth, comprising: using the activity of the tuyere swirl area to characterize the blast furnace hearth activity index; Blast kinetic energy E, depth of tuyere swirl area D R , Width of tuyere swirl area W R ; Secondly, according to the proportion of the area of ​​the tuyere swivel area and the ratio of the width of the tuyere swirl area to the circumference of the blast furnace hearth, the permeability index K of the tuyere swirl area is calculated respectively 1 and hearth cross-section air permeability index K 2 ;Comprehensive construction of blast furnace hearth activity index HAI, and HAI=K 1 *K 2 , to achieve quantitative characterization of hearth activity. This method overcomes the distortion and lag of traditional hearth activity calculation results, can accurately, reasonably and effectively reflect the activity level and state of the hearth area, and is an important judgment basis and technical basis for guiding the adjustment of the lower part of the blast furnace.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking, in particular to a method for quantitatively evaluating the activity index of a blast furnace hearth. Background technique [0002] The state of the blast furnace hearth is the basis for the smooth running of the blast furnace. In recent years, due to the deterioration of the quality of raw materials and fuels, the boilers have been shut down frequently. Insufficient understanding of the operation theory and other reasons lead to frequent accidents of abnormal activity of the blast furnace hearth, which brings great safety hazards and economic losses to the production process. Therefore, quantifying blast furnace hearth activity is of great significance to guide blast furnace production operations. [0003] At present, regarding the evaluation of hearth activity, ironmaking operators mainly use the ratio of furnace bottom center temperature to hearth side wall temperature to ch...

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Problems solved by technology

[0005] However, the current use of blast kinetic energy as an index to characterize the change in the shape of the tuyere convoluted area has certain shortcomings, that is, the same blast parameters can be maintained by adjusting the tuyere diameter, tuyere depth, tuyere area, air volume, wind pressure, and wind temperature. The kinetic energy of the blowing wind can be used to obtain different shape characteristics of the swing area. There is a defect that the kinetic energy of the blowing wind does not match the shape features of the swing area, and it is insufficient to characterize the activity of the swing area of ​​the tuyere only by relying on the depth of the swing area of ​​the tuyere, without considering the circumferential direction of the tuyere. Therefore, it is necessary to propose a more reasonable evaluation method to characterize the shape characteristics of the tuyere convoluted area, that is, a new blast furnace hearth activity index, to correctly guide the adjustment of the lower part of the blast furnace

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