Method for testing the destructive effect and performance influence of alkali metal and zinc vapor on coke

Abstract

The invention discloses a method for testing the destructive effect and the performance impact of alkali metal and zinc vapor to coke. The method comprises the following steps: uniformly mixing excessive active carbon powder and alkali metal carbonate or zinc oxide, arranging the mixture in a corundum crucible internally provided with a step, arranging a porous corundum gasket on the step in the crucible, arranging a reacting coke sample on the gasket, covering a cover, keeping a container in a sealing state; arranging the container in a constant-temperature region of a muffle furnace, raising the temperature to 1300 DEG C at a certain rate, keeping the temperature for 90min to ensure that metal steam is completely absorbed by coke; after reacting, recording the mass of a coke sample with the particle size being more than 23mm, calculating the specific gravity of the pulverized coke; and testing a thermal state performance of a sample which is eroded by metal vapor. The method is capable of singly representing a direct destructive effect of the metal vapor to the coke, is beneficial to finding a relationship between the steam enrichment and the coke performance, and provides a quantization basis for reasonably controlling an alkali load and a zinc load which are charged in a blast furnace.

Description

technical field [0001] The invention relates to the field of coke for blast furnace ironmaking, in particular to a method for testing the influence of alkali metal and zinc vapor on coke degradation and its thermal performance. Background technique [0002] As the most important fuel of the blast furnace, coke mainly plays four roles in the blast furnace: 1) combustion to provide energy; 2) gasification to provide reducing gas; 3) skeleton effect; 4) molten iron carburizing agent. Among them, the skeleton effect is an irreplaceable effect, especially in the form of large-scale blast furnace, high coal injection ratio and ore deterioration at present and in the future, the skeleton effect becomes more and more important, and becomes an important factor limiting the reduction of coke ratio. The skeleton effect of coke requires coke to have high strength, so coke strength has always been the most important indicator of coke. The alkali metal in the blast furnace has always bee...

AI Technical Summary

Problems solved by technology

Solve the problem that it is impossible to characterize and distinguish the direct destruction of coke by different harmful metal vapors (potassium, sodium, zinc) in the blast furnace, and provide quantitative indicators for evaluating the ability of metal vapor to destroy coke under high temperature conditions, filling the existing testing and evaluation of harmful Gaps in the Direct Destruction of Blast Furnace Coke by Metal Vapor

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