Lignite drying and screening forming process and drying and screening device thereof

Abstract

The invention relates to a lignite drying and screening forming process which comprises the following steps of: directly sending the lignite to a rotary-cylinder drying and screening machine after processing lignite by a pulverizing machine, and drying the lignite by hot flue gas; introducing the dried lignite into a screening cylinder during lignite raw material drying process, directly delivering out the screened coarse lignite, and introducing fine lignite particles into a forming machine; introducing fine lignite powder in the rotary-cylinder drying and screening machine into a fine powder collecting device, introducing the dust in the fine powder collecting device into a cloth bag dust-removing device through a duct, and introducing the fine lignite powder into the forming machine; delivering out the fine lignite particles and the fine lignite powder after forming in the forming machine; and exhausting dust by a fan machine through a duct. The invention screens lignite during the drying process, selects high-quality lignite as a finished coal product to be sold at a high price, and forms low-quality coal as molded coal to be sold in an adhesive-free extrusion mode. The process increases the heat value of lignite, reduces the self ignition probability of lignite, and solves the problem of environmental pollution of powder coal during storage, packaging and transportation processes. By adopting the special device for drying and screening, the invention has simple process and wide application range.

Description

technical field [0001] The invention relates to a forming process and a device used in the process, in particular to a lignite drying and screening forming process and a drying and screening device. Background technique [0002] Lignite is an important energy and chemical raw material, but due to its high moisture content, low calorific value, high volatile content, and easy natural properties, its sales price is low and its sales radius is limited. There are many kinds of existing lignite drying and molding processes. Although the drying technology is becoming more and more mature, it also reflects that the dried lignite is pulverized seriously during its operation, which is not conducive to storage and long-distance transportation; in order to solve this technical problem, Australian companies use BCB technology to shape dried lignite. This technology adopts tubular drying technology, and all lignite needs to be deeply crushed before drying, which wastes a lot of energy a...

AI Technical Summary

Problems solved by technology

[0003] The present invention is aimed at many deficiencies in the prior art. One is to provide a lignite drying and screening molding process that not only improves the quality of lignite, but also has simple procedures and can solve the problems of storage, loading, and transportation after lignite drying. The second is to provide a drying and screening molding device necessary for this molding process

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