Determination method of material column liquid permeability index in COREX smelter-gasifier

Abstract

The invention relates to a determination method of a material column liquid permeability index in a COREX smelter-gasifier. The determination method comprises the following steps: 1) sampling: taking tuyere test samples on a central plane of a tuyere of the COREX smelter-gasifier from the tuyere to different positions of the center of the COREX smelter-gasifier through a tuyere sampling device along the radial direction of the COREX smelter-gasifier; coding the obtained tuyere test samples; 2) screening the tuyere test samples to separate out carbon coke / semi-coke, furnace dreg and iron; combining the carbon coke / semi-coke to form a tuyere carbon coke test sample and combining the furnace dreg to form a tuyere furnace dreg test sample; 3) determining the voidage epsilon and the pressure difference P of the tuyere carbon coke test sample, and the temperature strength Q of the tuyere furnace dreg test sample respectively through corresponding tests; 4) calculating according to a formula to obtain the liquid permeability index L of the tuyere test samples at different positions (wherein the formula is shown as the description). The determination method provided by the invention is high in operability and is simple and feasible; the determined material column liquid permeability index can be used for effectively evaluating the activity of a hearth of the COREX smelter-gasifier.

Description

technical field [0001] The invention relates to the technical field of non-blast furnace ironmaking, in particular to a method for measuring the liquid permeability index of a material column in a COREX melting gasifier. Background technique [0002] The blast furnace ironmaking process has many advantages unmatched by other ironmaking equipment, such as large production scale, high production efficiency, low energy consumption, long service life, good desulfurization performance and suitable for producing molten steel, so it has been used as a The main production process of ironmaking. However, blast furnace ironmaking also has many unfavorable factors, such as large investment scale, serious environmental pollution, inflexible production, etc., especially its heavy dependence on coke production; No or less coke and low CO 2 The emission-free non-blast furnace ironmaking process has been paid more and more attention, but currently only the COREX process developed by VAI i...

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Problems solved by technology

However, blast furnace ironmaking also has many unfavorable factors, such as large investment scale, serious environmental pollution, inflexible production, etc., especially its heavy dependence on coke production; No or less coke and low CO 2 The emission-free non-blast furnace ironmaking process has been paid more and more attention, but currently only the COREX process developed by VAI is the only new technology in the smelting reduction ironmaking process that has successfully realized industrial production

[0003] During the actual production of the COREX melting gasifier, it was found that the strength of the semi-coke produced by the cracking of lump coal into the furnace was not high, and the average particle size of the tuyere coke was small, which restricted the gas permeability of the material column in the furnace; since the tuyere of the COREX melting gasifier uses pure Oxygen blast, the air volume is small, so the activity of the hearth is poor

[0004] At present, there are few reports on the method of measuring the activity of the hearth of the COREX melter-gasifier, and the evaluation of the activity of the hearth of the blast furnace mostly depends on the monitoring of the temperature of the hearth of the blast furnace. The flow of slag and iron, the characteristics of coke in the hearth, etc. are not considered

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