A method for measuring and evaluating the high temperature performance of lump coal in smelting reduction ironmaking

Abstract

The invention discloses a method for measuring and evaluating the high-temperature performance of lump coal in smelting reduction ironmaking, comprising: weighing a preset mass m 1 The lump coal sample, the average particle size of the lump coal sample is d 0 ; Take the lump coal sample at 100%N 2 Heat up and keep warm under the atmosphere; put the lump coal sample in 20% CO 2 +80%N 2 Under the atmosphere, heat up to 700 ℃ ~ 850 ℃ and keep it warm; put the lump coal sample in 20% CO 2 +80%N 2 The temperature was raised to 1100°C under the atmosphere, and then the atmosphere was switched to 100% CO 2 ;Calculated to obtain lump coal reactivity C I ; Measure the particle size distribution of the lump coal sample after the reaction under different input power W, and calculate the average particle size d after the reaction f ; Take the abscissa as the abscissa and the input power W as the ordinate to perform linear fitting and plot, and calculate the fracture coefficient of the lump coal sample according to the slope k of the fitted line. The evaluation result of the method of the present invention is more objective and true.

Description

technical field [0001] The invention belongs to the technical field of COREX or FINEX smelting reduction ironmaking, and particularly relates to a method for measuring and evaluating the high-temperature performance of lump coal in smelting reduction ironmaking. Background technique [0002] The smelting reduction ironmaking process directly uses non-coking coal, lump ore and pellets to produce molten iron. Compared with blast furnace ironmaking, it has the characteristics of shorter process and less pollution. However, due to its limited development time, there are still many imperfections in production. place. During its production process, after the lump coal is added from the top of the melting and gasifying furnace, it will gradually become coke along with the melting and reducing process in the furnace. In the COREX or FINEX melting gasifier, the coke or semi-coke formed after the cracking of lump coal plays a similar function to the coke used in the blast furnace, th...

AI Technical Summary

Problems solved by technology

There are two main defects of this method: one is to ignore the coke-forming environment of the lump coal in the melting and gasifier, and directly put the lump coal in the N 2 Low-temperature dry distillation (500-600°C) under atmosphere, the actual melter-gasifier top temperature is about 800°C, and the lump coal starts to contact CO 2 , that is, there is CO in the coke-forming atmosphere 2 ; The second is to only use the proportion of samples with a particle size greater than 10mm or 3mm after the reaction as the post-reaction strength of lump coal, without considering the influence of the smelting strength of the melting and gasifier and the size of the furnace volume on the evaluation results, which deviates greatly from the actual , less reliable

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