A pulverized coal granulation method and equipment for lignite

Abstract

Disclosed are a pulverized coal granulation method and a granulator apparatus thereof for lignite. Material preparation in a granulation process is: pulverized coal that needs to be granulated is sieved and crushed to 4 mm or less in particle diameter; the water of the pulverized coal that needs to be granulated is controlled at a water content between 20% and 45%; the pulverized coal that is sieved and crushed is transported to the granulator apparatus to be prepared into pulverized coal particles, where the pulverized coal particles are 4-12 mm in particle diameter and 5-30 mm in length; and, the pulverized coal particles granulated and molded are dried to a water content between 8% and 20%. The present invention improves an existing "technique for pressing pulverized coal after drying" into a "technique for drying pulverized coal after granulation;" the granulation technique has the advantages of low energy consumption, low equipment wear and tear, low equipment costs, low production costs, and a large yield.

Description

technical field [0001] The invention relates to the field of coal processing and utilization, in particular to the pulverized coal granulation and drying technology of lignite. Background technique [0002] Lignite or low-metamorphism long-flame coal has low strength, high water content (moisture content is generally above 30%), low unit calorific value, and heavy dust pollution. The coal powder needs to be dried and pressed or granulated. The method adopted by various countries is to press into briquettes after drying or extrude into oval briquettes with rollers. Because lignite has a sponge structure, it is easy to absorb moisture in the air and expand, so the existing technology needs a lot of pressure to press into briquettes or briquettes, reaching more than 1000kg / c㎡, which consumes a lot of energy, and the power consumption per ton exceeds 50 degrees. , the equipment is expensive and the loss is large. If the raw coal is pressed and then dried in the existing pressi...

AI Technical Summary

Problems solved by technology

Because lignite has a sponge structure, it is easy to absorb moisture in the air and expand, so the existing technology needs a lot of pressure to press into briquettes or briquettes, reaching more than 1000kg / c㎡, which consumes a lot of energy, and the power consumption per ton exceeds 50 degrees. , the equipment is expensive and the loss is large

If the raw coal is first pressed and then dried by the existing pressing method, the pulverized coal will scatter during the drying process, and the coal pile will collapse, failing to meet the forming requirements, hindering processing, storage and transportation

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