Coal blending and coking method involving low metamorphism, high flow and high expansion coking coal

Abstract

The invention discloses a coal blending and coking method with low-metamorphic high-flow high-expansion coking coal participated in. The method comprises the following steps that 1, a coal blending formula is determined, wherein the formula comprises 0-30% of gas coal, 40-60% of coking coal, 5-20% of lean coal and 20-40% of low-metamorphic high-flow high-expansion coking coal; 2, all the kinds of coal except for the low-metamorphic high-flow high-expansion coking coal are mixed and crushed till the fineness is 80-90%; 3, the low-metamorphic high-flow high-expansion coking coal is not crushed or roughly crushed and mixed with other single kind of coal crushed in the step 2, and the mixture is put into a furnace for coking. According the method, the low-metamorphic high-flow high-expansion coking coal is not crushed or roughly crushed; in the coking process, after coal blocks are heated, gas molecules formed after coal block interior splitting decomposition are surrounded by surrounding liquid phase plastic mass when volatilized outwards, and polymerization occurs between a small parts of gas micromolecules or between gas micromolecules and liquid phase molecules, so that the coking rate is improved, the coke porosity is lowered, cracks are normally formed, and coke strength is improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and coking, and in particular relates to a coal blending and coking method involving low metamorphism, high flow and high expansion coking coal. Background technique [0002] Average maximum reflectance of vitrinite in my country Between 0.60% and 0.85%, the volatile V daf Between 32% and 42%, the colloidal layer’s maximum thickness Y value is greater than 23mm, Gi’s maximum fluidity is greater than 10000ddpm, and the maximum Aurora expansion degree b value is greater than 100%. Coking coal resources are abundant, and are found in Shandong, Shanxi and Guizhou There are a large number of such coal resources. Usually, this kind of coking coal is called low-metamorphic high-flow high-expansion coking coal. It adopts the traditional particle size control method. Like other coal types in the blended coal, it is mixed through the coal blending tray according to the coal blending ratio, and then se...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a coal blending coking method involving low-modification, high-flow, high-expansion coking coal, so as to overcome the problem of coking when the blending ratio of this type of coal is greater than 20% in the prior art. Low coking rate, increased porosity, decreased coke cold and hot strength and uneven coke particle size

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