Integral process and device for crushing, drying, forming and upgrading lignite containing moisture

Abstract

The invention discloses an integral process and a device for crushing, drying, forming and upgrading lignite containing moisture. The lignite with 20-50% of moisture and less than 100mm of granularity is sent into an integral crushing-drying device. The integral crushing-drying device crushes the lignite to have the granularity of less than 3mm, and high-temperature smoke produced by a smoke system is sent into the integral crushing-drying device at high speed to enable the crushed fine lignite particles and lignite power to be dried from bottom to top. Dried fine lignite particles and dried lignite power are driven by the high-speed high-temperature smoke to enter a cyclone separator to be separated. Separated fine lignite particles and separated lignite power enter a prepressing helical device from the position under the cyclone separator, and the lignite materials are prepressed and then enter a high pressure forming machine to be pressed and formed into finished lignite products. The device mainly comprises the smoke system, the integral crushing-drying device, the cyclone separator, the prepressing helical device and the high pressure forming machine. The integral process and the device for crushing, drying, forming and upgrading the lignite containing moisture is low in investment operating cost, high in upgrading efficiency and good in upgrading quality.

Description

technical field [0001] The invention belongs to the technical field of comprehensive and high-efficiency utilization of water-rich lignite for quality improvement, and in particular relates to an integrated crushing, drying, molding and quality-improving process and equipment for water-rich lignite. Background technique [0002] Lignite is the least coalified coal, a brown-black, dull, low-rank coal between peat and bituminous coal. Lignite contains 20-50% total moisture, 10-30% analytical base moisture, 15-30% volatile matter, and 11.71-16.73mj / kg calorific value. Because lignite contains extremely high moisture, it directly participates in combustion or coal gasification. On the one hand, it needs to consume a lot of energy during the ignition process; on the other hand, lignite has high volatile content, and is prone to spontaneous combustion and explosion. In addition, due to the large amount of heat energy taken away in the process of water evaporation, the heat loss o...

AI Technical Summary

Problems solved by technology

In the process, for the crushing and screening of lignite, it is necessary to establish multiple special crushing and screening stations. The lignite crushed and screened to less than 3mm needs to be sent to the drying and forming equipment by belt, bucket elevator or scraper conveyor for drying, Quality improvement such as forming, complex process system, large floor area, high investment and maintenance

At present, a lot of research has been done on the process system simplification, efficiency improvement and cost reduction of lignite upgrading in the world, but no good breakthrough has been made.

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