Method for coal blending for coking by high-metamorphic-grade weak caking coal

Abstract

The invention discloses a method for coal blending for coking by high-metamorphic-grade weak caking coal. The method comprises the following steps of: (1) crushing high-metamorphic-grade coal into different granularity gradients, respectively blending the high-metamorphic-grade coal under each granularity with other caking coals to carry out coking, detecting a quality index of obtained coke and determining the best crushing granularity of the high-metamorphic-grade coal; (2) blending non-high-metamorphic-grade coals in the blended coal and dividing into a coal part 1 and a coal part 2, blending the high-metamorphic-grade coal which is crushed to the best granularity with the coal 1 according to the previous proportion and pressing and molding a coal block, and mixing the high-metamorphic-grade coal which is crushed to the conventional granularity with the coal 2 according to the previous proportion to obtain blended coal 3; and (3) mixing the molded coal block with the blended coal 3 obtained by the step (2) and coking. The method disclosed by the invention can improve the adding amount of the weak caking coal on the premise that the quality of the coke is guaranteed, so that the effects of reasonably utilizing a coal resource and optimizing a coal blending structure are realized.

Description

technical field [0001] The invention relates to a coal blending and coking method, in particular to a method in which highly metamorphic and weakly caking coal materials participate in coal blending and coking Background technique [0002] With the improvement of coke quality requirements for large-scale blast furnaces, the contradiction between the over-reliance on strong caking coal and the shortage of high-quality coking coal resources in coking coal blending has become increasingly prominent. On the premise of ensuring the quality of blast furnace coke, new coal Material pretreatment technology and rational use of weakly cohesive coal materials for coking have become an important way for the coking industry to optimize coal blending structure, reduce coking costs, and save coking coal resources. The pretreatment of coal materials includes increasing the bulk density of coal for furnace charging and regulating the particle size of coal materials. In order to improve the q...

AI Technical Summary

Problems solved by technology

The pretreatment of coal materials includes increasing the bulk density of coal for furnace charging and regulating the particle size of coal materials. In order to improve the quality of coke and increase the amount of weakly caking coal, coking plants usually use appropriate coal in production according to their own characteristics. The process regulates the particle size of coking coal materials, mainly including the process of mixing first and then pulverizing, and the separate pulverization process for coal materials and components with special requirements on particle size; in the process of mixing first and then pulverizing, it is difficult to pulverize coal materials with high metamorphism and weak cohesion , larger particles, prone to segregation during furnace loading, resulting in uneven mixing of active components and inert components, prone to cracks during semi-coke shrinkage, and deteriorating coke quality

However, if the coal material and components with special requirements on particle size are used for separate pulverization, although the coal material can be pulverized to the particle size distribution required for optimal coking performance, the high metamorphic coal that is suitable for coking at a fine particle size After fine crushing, the increase of the fine coal content in the mixed coal material will make it difficult to install the furnace and cause serious environmental protection problems. Therefore, in general production, the coal material with a high degree of deterioration is simply pre-crushed. The improvement effect of coke quality is small. Therefore, in coal blending and coking, the amount of highly metamorphic and weakly caking coal materials is generally controlled in a low range, resulting in a high level of coal blending costs.

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