Coal blending method based on coking property of coking coal

Abstract

The invention discloses a coal blending method based on the coking property of coking coal. The method comprises the following steps: 1) testing a value G of a caking index of each single coking coal and a volatile matter Vdaf of each single coking coal; 2) setting that the value G represents the coking property of single coking coal, and supposing that a value J is equal to the value G*1 / (1+3.5*|Vdaf-20.5%|); 3) calculating to obtain the value J and blending the coal according to the following weight percentage: 0-25 percent of the coking coal of which the value J is less than or equal to 50, 0-30 percent of the coking coal of which the value J is more than 50 and less than or equal to 60, 10-30 percent of the coking coal of which the value J is more than 60 and less than or equal to 65, 10-30 percent of the coking coal of which the value J is more than 65 and less than or equal to 70, 20-60 percent of the coking coal of which the value J is more than 70 and less than or equal to 75, and 0-15 percent of the coking coal of which the value J is more than or equal to 75; and 4) controlling the volatile matter Vdaf of the blending coal at 24-30 percent. According to the coal blending method, the value J is associated with the value G and Vdaf, so that the quantity and quality of a plastic mass can be reflected well and are better indexes for preventing the coking property of the different types of coking coals; moreover, the coking of the blending coal can be guided well.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and coking, and in particular relates to a coal blending method based on the coking property of coking coal. Background technique [0002] The cohesiveness of coal is the ability of bituminous coal to bind itself and add inert substances when it is dried. Caking index G value is the most common method to characterize the caking property of bituminous coal. In traditional coal quality analysis and coal blending technology, G value is not only used to evaluate coal quality, but also the main process index for coal blending and coke quality prediction. Although the G value has a great guiding effect on coal blending and coking, with the further deepening of production practice, it is found that there are the following problems: 1) There are huge differences in the coking strength of coking coals with the same G value but different types; 2) The blended coal obtained by combining several groups o...

AI Technical Summary

Problems solved by technology

Although the G value has a great guiding effect on coal blending and coking, with the further deepening of production practice, it is found that there are the following problems: 1) There are huge differences in the coking strength of coking coals with the same G value but different types; 2) The blended coal obtained by combining several groups of different types of coal may have the same G value, but the coke strength after smelting is very different

[0003] In order to overcome the above-mentioned defects and improve the evaluation method of the coking property of coking coal, those skilled in the art try to evaluate and determine the coking property of coking coal by using the average maximum reflectance of vitrinite, the index of Kiwi mobility and the optical structure. It has a good effect, but the determination of the above indicators requires high experimental conditions, such as expensive equipment and high-quality technical personnel.

For small iron and steel enterprises with poor basic conditions, because they do not have the conditions to measure the average maximum reflectance of vitrinite, Gibraltar fluidity index and optical structure index, there is often blindness in coal blending and coking, and the quality of coke produced Poor stability

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