Coal blending method to increase gas-coal blending amount

Abstract

The invention discloses a coal blending method capable of increasing the blending amount of gas coal. The method comprises the following steps: 1) controlling the reasonable granularity of gas coal; 2) determining and analyzing the volatile compounds, caking index, coarse grain mosaic structure and maximum average vitrinite reflectivity of each coking coal, wherein according to determined values of the above-mentioned indexes, coking coals are respectively recorded as the coking coal No. 1 and the coking coal No. 2, and 1 / 3 coking coals are respectively recorded as the 1 / 3 coking coal No. 1 and the 1 / 3 coking coal No. 2; and 3) determining the blending proportion of each coking coal. According to the invention, through controlling of granularity of gas coal and selection of appropriate coking coal varieties, no or a small amount of high-quality coking coal may be blended, coal properties of different coking coals are given to full play, the blending proportion of gas coal is increased, and coal blending cost is reduced. Dry quenching CSR of a top-mounted coke oven with a height of more than 6 m is no less than 65.0% without coal-free humidifying, coal molding, tamping coking or the like.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a coal blending method for increasing the amount of gas-coal blending. Background technique [0002] my country is rich in coal resources, but coking coal resources are in short supply, and the limited coking coal resources are distributed unevenly. Among the proven coal reserves, coking coal reserves only account for 26% of the total coal reserves, and most of them are gas coal. And 1 / 3 coking coal, accounting for more than 46% of the total coking coal, coking coal accounting for 17.57% of coking coal reserves, fat coal accounting for 10%. In order to obtain high-quality coke and meet the needs of large-scale blast furnaces, most large-scale steel mill coking enterprises in China use high-quality coking coal such as coking coal and fat coal to reach 60-80%, and then mix in a certain amount of 1 / 3 coking coal, and only a small amount of gas coal Add (2-...

AI Technical Summary

Problems solved by technology

However, the vitrinite emissivity only represents the degree of metamorphism of coking coal, and has no obvious relationship with the process properties, and this method is only a control of apparent properties, which cannot directly reveal the thermal properties of coke

Xiang Ru (ZL201210113979.4 A coking coal blending method involving gas-coal) reported a blending method that increases the gas-coal ratio to 5-15%. 60%, G>85) coking coal ratio is about 20%, due to the scarcity of high-quality coking coal resources, this method is easily limited by resources

At present, the price of general-quality coking coal with a G value of 78-85 is relatively low, and the resources are relatively abundant, but they have not been effectively used

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