Method of coal blend coking

Abstract

The invention discloses a method of coal blend coking, comprising the steps as follows: blending various single coking coal as follows in percentage by weight: 1-5 percent of gas-fat coal, 5-15 percent of fat coal, 25-35 percent of 1 / 3 coking coal with Vdaf larger than 29 percent, 3-10 percent of Indonesia coal, 25-35 percent of coking coal with the Vdaf smaller than 27 percent and 10-15 percent of lean coal, wherein, to the Indonesia coal, the Vdaf is between 27-29 percent, the Y value is no more than 25mm and the maximum reflectance of vitrinite is 1.0-1.15 percent, the G value is larger than 85, the initial softening temperature is larger than 400 DEG C, the maximum fluidity temperature is between 450-470 DEG C, the Gieseler fluidity maximum value is smaller than 500ddpm, the Audiberts-Arnu dilatation b percent is larger than 100 percent, and the coking coarse mosaic is over 60%; and the G value of mixed coal is 79-82, the Gieseler fluidity of the mixed coal is 400-1000ddpm, and the Audiberts-Arnu dilatation (a+b) percent of the mixed coal is 30-40 percent.

Description

technical field The invention belongs to the technical field of coking coal blending, and in particular relates to a method for coking coal blending. Background technique my country is rich in coal resources, but coking coal resources are in short supply, and the limited coking coal resources are not evenly distributed. Among the proven coal reserves, gas coal and 1 / 3 coking coal account for more than 46% of the total coking coal, coking coal accounts for 17.57% of coking coal reserves, and fat coal accounts for 10%. In coal blending and coking, coke and fat coal should generally account for 50%-60%, that is to say, the amount of various coking coal resources in my country does not match the requirements of coking coal blending. Therefore, in our country, the rational application of coal blending technology is not only a need to ensure the quality of coke, but also a realistic requirement for rational use of coal resources and cost savings. The V-G diagram is commonly use...

AI Technical Summary

Problems solved by technology

However, since the coke formed by coking coal undergoes softening, devolatilization, expansion, solidification and other processes, its fluidity and Oya expansion should also be an important parameter affecting the coking of coal blending; especially this method is mainly aimed at my country. The domestic coal resources are summarized. In recent years, more and more coal resources have been imported from abroad. The reason is that the coal quality is affected by many factors such as geological age, geographical environment, and coal-forming conditions. Applying this method to add foreign coal resources When adding foreign coking coal with a dry ash-free volatile content between 27-29%, the quality of the coke produced is often not ideal.

Images