Method for measuring and evaluating 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. The method comprises the steps of: weighing a lump coal sample having the pre-set mass m<1>, wherein the average particle size of the lump coal sample is d<0>; increasing the temperature of the weighed lump coal sample in 100% N<2> atmosphere, and keeping the temperature; increasing the temperature of the lump coal sample to 700-850 DEG C in 20% CO<2> and 80% N<2> atmosphere, and keeping the temperature; increasing the temperature of the lump coal sampleto 1100 DEG C in 20% CO<2> and 80% N<2> atmosphere, then, switching the atmosphere into 100% CO<2>, and completely reacting; obtaining the reactivity C of the lump coal by calculation; measuring particle size distribution of the reacted lump coal sample in different input power W, and obtaining the average particle size d<f> after reaction by calculation; and, performing linear fitting and mapping by taking a formula as shown in the specification as the horizontal coordinate and the input power W as the vertical coordinate, and obtaining the fracture coefficient of the lump coal sample bycalculation according to the fit straight slope k. The method in the invention considers influence of the smelting intensity, the atmosphere and the actual temperature schedule of a melting gasification furnace; and an evaluation result is relatively 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

Images