Method for measuring permeability index of front coke or carbocoal of COREX or blast-furnace tuyere

Abstract

The invention discloses a method for measuring a permeability index of front coke or carbocoal of a COREX or a blast-furnace tuyere. The method comprises the following steps of: taking powder-containing slag-iron-free furnace burden at the blast-furnace tuyere as a total coke test sample; measuring a granule voidage E(total) of the total coke test sample; measuring a granule shape coefficient phi(total) of the total coke test sample; measuring granule specific surface average diameter de(total) of the total coke test sample; and obtaining a permeability index value of the total coke test sample according to a formula, FORMULA. By the method, the measurement of the furnace burden permeability index of the powder-containing furnace burden is realized; and the method can be widely applied tosmelting industries.

Description

technical field [0001] The invention relates to the field of blast furnace ironmaking, in particular to a method for measuring the air permeability index of coke or semi-coke in front of a blast furnace tuyere. Background technique [0002] The ironmaking process is a variety of intricately intertwined chemical reactions and physical changes that occur during the countercurrent movement of the charge and gas. Coke, as the "skeleton" of the material column in the furnace, is a favorable guarantee for the gas in the furnace to go upward. With the advancement of smelting technology, in order to increase the ore in each batch of charge and increase the amount of iron, the coke ratio continues to decrease, resulting in more prominent gas permeability problems between charge and coke in the furnace. The air permeability index reflects the difficulty of the gas flowing through the furnace material layer, the fluctuation state of the gas in the furnace material layer and its changi...

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Problems solved by technology

[0003] At present, for different measurement methods of non-powder charge air permeability index, there are different expression methods of air permeability index, but these expression methods are all based on Ergun (Ergun) formula, according to charge pressure difference, gas flow density, gas flow velocity, charge Particle shape coefficient, charge particle equivalent diameter and charge particle porosity reflect air permeability index, e.g., the most classical expression In the case of a powder-containing charge, since the powder will be blown away by the high-pressure air flow into the coke pressure difference measuring device, the charge pressure difference cannot be measured, and there is no unified method for the determination of the particle shape of the charge, so it is impossible Determination of charge gas permeability index

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