Method for simulation test of influence of alkali metal on coke degradation

Abstract

A method for a simulation test of the influence of alkali metal on coke degradation belongs to the field of blast furnace ironmaking technology. Aactive carbon powder and alkali carbonate powder are mixed and added into a corundum crucible; the crucible is placed on the upper part of a high-alumina ball at the bottom of a high temperature reaction vessel; a porous permeable corundum gasket is placed on the corundum crucible; three high temperature resistant corundum branch pipes with a height of 30-60 mm are placed on the gasket; a permeable gasket is placed above the corundum branch pipes; acoke sample is placed on the permeable gasket; after the sample is in place, the sample is heated and argon is pumped in to discharge air in the reaction vessel; when the temperature in the reaction vessel reaches 1200 DEG C, alkali metal vapor is generated; the sample is cooled to room temperature with the protection of argon, and the coke adsorbed with alkali vapor is inspected and analyzed. The advantages are that: the problem is solved that simulation tests of the adsorption of alkali metal elementary vapor on coke during the vapor rising process at 1100-1300 DEG C and the influence of CO2 on coke degradation can not be performed, and an evaluation index for evaluating the alkali metal harm resistance of coke at high temperature is provided.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking, and in particular relates to a method for simulating and testing the influence of alkali metals on coke degradation, simulating and testing the effects of adsorption on coke and the degradation of coke during the rising process of alkali metal elemental steam in an alkali-enriched area of ​​a blast furnace, The results can also be used as an additional quality evaluation index for blast furnace coke. Background technique [0002] With the improvement of the smelting intensity of modern large-scale blast furnaces, the increase of coal injection ratio and the deterioration of ore, the role of coke as the skeleton of the blast furnace material column has become more and more prominent. Both the strength and particle size are decreasing. When the coke deterioration is serious, it will directly lead to the decrease of gas permeability of the material column and the unbalanced distribu...

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Problems solved by technology

[0003] The present invention is to provide a method for simulating the influence of alkali metal on coke degradation, solving the problem of the inability to simulate the adsorption of alkali metal elemental vapor on coke and the presence or absence of CO during the rising process at 1100-1300°C 2 In this paper, the problem of the influence of coke degradation is given, and a quantitative evaluation index is given to evaluate the ability of coke to resist the damage of alkali metals at high temperature, filling the gaps in the existing testing and evaluation of the adsorption capacity of alkali metals on coke in the alkali-enriched area of ​​the blast furnace and the influence of coke degradation. gaps

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