Method of coal blending for coking by steam coal pretreatment

Abstract

The invention provides a method of coal blending for coking by steam coal pretreatment, which comprises the following steps: putting lignite, long flame coal, weakly caking coal, and non-caking coal in a furnace, performing dry distillation at a temperature of 450-550 DEG C to reach a Vdaf of volatile components of 13-20%, putting the coal in a ball mill to obtain particles with a particle size of less than 1 mm to keep in reserve; well mixing the dry-distilled steam coal with coking coal with a weight ratio of 0.05-0.08:1, putting into the furnace for coking. The coking coal comprises 130 coking coal, 1890 gas-fat coal, Ningxia 1 / 3 coking coal, Liuhuanggou fat coal, dry-distilled semicoke, Baicheng mixed coal, Kuqa gas coal, and low-temperature dry-distilled 42# long flame coal, and has a coke strength M40 of 77.0-78.0. According to the method, steam coal with particles being less than 1 mm is used for coal blending for coking instead of gas coal, and coke strength M40 is increased by 0.4%.

Description

technical field [0001] The invention relates to a coal blending coking technology, in particular to a low-cost method for obtaining metallurgical coke by substituting thermal coal dry distillation pretreatment for lean coal, gas coal, and lean coal, and has an excellent use effect. Background technique [0002] The production ratio of traditional metallurgical coke is: main coking coal + fat coal + thin coal + gas coal + (1 / 3 coking coal) + lean coal is the basic coal blending framework, or a single type of coal can be selected according to the coke quality requirements and resource conditions Coking, usually gas-coal iron-making alloy coke, pre-treated steam coal does not coke, in order to expand coking coal resources, use weak caking coal or non-caking coal for coking, suitable for various new coking coal blending coking in conventional coke ovens The technology (coal drying, preheating, selective crushing, tamping, coal blending, artificial binder or slimming agent, etc.)...

AI Technical Summary

Problems solved by technology

[0002] The production ratio of traditional metallurgical coke is: main coking coal + fat coal + thin coal + gas coal + (1 / 3 coking coal) + lean coal is the basic coal blending framework, or a single type of coal can be selected according to the coke quality requirements and resource conditions Coking, usually gas-coal iron-making alloy coke, pre-treated steam coal does not coke, in order to expand coking coal resources, use weak caking coal or non-caking coal for coking, suitable for various new coking coal blending coking in conventional coke ovens The technology (coal drying, preheating, selective crushing, tamping, coal blending, artificial binder or slimming agent, etc.) has reached the level of industrialization, thus becoming a solution to the problem of producing high-quality coke from poor coking coal. However, the above-mentioned method does not substantially change the internal structure and composition of weakly caking coal or non-caking coal, while the volatile content of pretreated weakly caking coal and non-caking coal is reduced, and the Its thermal decomposition characteristics transition to those of moderately metamorphic coal. For non-coking coal (lignite, long-flame coal, weakly caking coal, non-caking coal) coal blending coking process, direct Mixing a small amount of coal (lignite, weak caking coal, long-flame coal, non-caking coal) for coal blending coking, the main disadvantage of directly blending a small amount of steam coal blending coal coking is that the cold and hot peptide strength of coke is reduced A small amount of coke powder and anthracite powder are added as a slimming agent. Compared with pretreated thermal coal, it is an inert substance with low volatile content and poor fusion ability with colloid formed by coking coal. Industrial production The well-known Japanese "SCOPE21 Coking Technology Research and Development and Application" is to conduct heat treatment and hot-pressed briquette treatment on all raw materials (100%) before entering the coke oven, and this technology is actually coal The integration of preheating and briquette coking processes means that the preheating temperatures for coarse and fine coal are 350°C and 165°C respectively, without changing the structure and composition of steam coal

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