A coal blending method using a large proportion of high volatile coking coal

Abstract

The invention discloses a coal blending method for smelting coking coal by using a high-volatile component on a large scale. The blended coal is prepared from the following coal by weight percent: 15-20% of gas coal, 27-30% of 1 / 3 coking coal, 10-16% of fat coal, 26-29% of coking coal, and 10-15% of lean coal in a mixing manner; the sum of the coal by weight percent is 100%; the sum (high-volatile component coal) of the gas coal and the 1 / 3 coking coal in the blended coal is greater than or equal to 40%; the ratio of the coking coal in the blended coal is smaller than 30%; the volatile component Vdaf of the gas coal is greater than 40%, the volatile component Vdaf of the 1 / 3 coking coal is greater than 36%; the volatile component Vdaf of the blended coal is 31-32%; the crushing strength M40 of the coking coal in the blended coal is greater than 85%, the abrasive resistance M10 is smaller than 6.8%, the reactiveness CRI is smaller than or equal to 28%, and the strength CSR after reaction is greater than 65%. By adopting the coal blending method, the coking coal quality is ensured, excellent resources are saved, and the coal blending cost is reduced.

Description

technical field [0001] The invention relates to a coal blending method using high-volatile coking coal in a large proportion, and belongs to the technical field of coking coal blending. Background technique [0002] At present, coking coal resources are scarce in all countries in the world. The large-scale blast furnace requires higher and higher coke quality and stability. However, there are fewer and fewer strong caking coals in coking coal resources. At the same time, a large amount of high-volatile coal is used. Coal blending and coking will increase the volatile content of blended coal, increase coke cracks, and decrease strength, especially the crushing strength M40 of coke. It is generally believed that for every change of volatile content of coal blending by ±1%, M40 changes by ±2.0%, and M10 changes ±0.2%. [0003] Therefore, in order to ensure the strength of coke, the proportion of high-volatile coal coking used in domestic coking plants is relatively small, and ...

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Problems solved by technology

However, with the enlargement of blast furnaces and the development of oxygen-enriched coal injection technology, this invention still cannot meet the needs of existing production

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