Classified pulverization and humidity control technology combining mechanical separation and air separation of coking coal into the furnace

Abstract

The invention discloses a machine separation and wind separation combined classified crushing and humidity regulation process for in-furnace coking coal. The process comprises the following steps: classifying a wet coal material into two particle grades, namely larger than or equal to 12mm and smaller than 12mm, by adopting a mechanical high-amplitude sieve; classifying the coal material which is smaller than 12mm in a wind separation sieving machine into two particle grades, namely smaller than or equal to 5mm and larger than 5mm; regulating the humidity of the coal material which is smaller than or equal to 5mm until the water content is 4% to 6% by adopting a humidity regulator; crushing the selected coal material which is larger than or equal to 12mm and the selected coal material which is larger than 5mm by using a crusher; mixing the coal materials with humidity-regulated dry coal and Phi3.5 ball coal in a baffling plate type mixer to form in-furnace dry coal. The process has the advantages that the system is reliable in operation; the classified crushing is beneficial for maintaining the coking properties and stable yield; the classified humidity regulation has the effects of reducing the burden of the humidity regulator and saving energy; primary impurity removal and the mechanical sieve have the effects of reducing the burden of the wind separation sieve and reducing the blocking possibility; a back mixing process is suitable for humidity regulation of a high-water coal material in rainy season; segregation of the coal material, generated in classification, drying and dehumidification, can be eliminated; various types of humidity regulators can be provided for the process.

Description

technical field [0001] The invention relates to the technical field of coking in the coking industry, in particular to a process of graded pulverization and humidity control combined with mechanical separation and winnowing of coking coal fed into the furnace. Background technique [0002] Coal is an amorphous material, and its particle size (generally divided by >25mm, 25-10mm, 10-5mm, 5-3mm, 3-1.5mm, 1.5-1mm, <1mm) component ratio varies with coal types , The coking industry requires that the proportion of coking coal ≤ 3mm particle size ≥ 85%. The traditional coal blending coking scheme of coking has two processes of "blending first and then pulverization" and "first pulverization and then blending". Although the "mixing first and pulverization" process has a small investment, some coal types have excessive pulverization (mainly affecting coke quality and production capacity), and the crushing operation cost of all components (according to particle size) is relativ...

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Problems solved by technology

Because there are about 26% of the coal material ≥10mm, it also contains ironware, concrete blocks, straw, branches and other sundries (substances), these sundries (substances) can easily cause the blockage of the screening machine and affect the production

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