Coal blending and coking method capable of reducing coke granularity

Abstract

The invention discloses a coal blending and coking method capable of reducing the coke granularity. The method comprises the following steps of: 1) detecting the gelatinous layer index of regulating coal to obtain a final shrinkage degree X, and observing the volume curve of the gelatinous layer; preparing the regulating coal with the final shrinkage degree X more than 35mm or the regulating coal with the final shrinkage degree X less than or equal to 35mm and more than 28mm and a zigzag shaped volume curve of the gelatinous layer, wherein the regulating coal accounts for 25 to 40 percent of the coke by weight and comprises gas coal and 1 / 3 coking coal, and the gas coal accounts for 0 to 10 percent of the regulating coal by weight; and 2) adding other single coals to realize the sum of the gas-fat coal and fat coal to be between 8 and 15 percent by weight, the coking coal to be between 32 and 42 percent by weight, and lean coal to be between 5 to 13 percent by weight. The method can be used for improving the coke granularity from the point of coal blending and coking, does not need to change the prior production process or add other mill coal, can be used for regulating the coke granularity by regulating the existing coal blending structure, is simple in implementation, strong in operability and low in cost.

Description

Technical field [0001] The invention belongs to the technical field of coking coal blending, and specifically relates to a coking coal blending method for reducing coke particle size. Background technique [0002] One of the main effects of coke on blast furnace ironmaking is the skeleton function of the charge. During the smelting process, the air permeability of the lower column of the blast furnace is almost completely maintained by the coke, acting as a gas vent. The proper average particle size of coke is very important for stable and high output of blast furnace. To ensure that the blast furnace charge flows smoothly and ventilated, especially in the case of oxygen-enriched coal injection, the particle size of coke must be as uniform as possible. The specific particle size composition is determined according to the blast furnace volume, the raw materials used and the blast furnace operating system. The particle size of coke is too large, which is very different from the p...

AI Technical Summary

Problems solved by technology

However, since the above method is to adjust the particle size of coke by means other than coking coal blending, the cost of rectification is high, and there are many problems to be solved in the production process, so the feasibility in production is not very strong