The invention is applicable to the technical fields of
coal drying and
coal dressing, and particularly relates to a
coal drying and upgrading method. The method is mainly characterized in that a
microwave drying system is used for drying raw coal, and a dry dressing
system based on a sensor is used for separating out waste rocks or high-ash coal in the raw coal. The
microwave drying has the advantages of high drying rate, energy saving, high production efficiency, uniform drying, clean production and favorable safety performance, is easy to realize
automatic control, overcomes the problems of high coal burning possibility, high
dust explosion possibility and the like in the high-temperature and medium-temperature drying process, and does not change the original property of the coal, thus being especially suitable for the drying of lignite, other metamorphic coal varieties, other high-activity coal varieties and other inflammable materials; and the dry dressing
system avoids the use of a
water source, solves the problem on coal separation in a water-deficient area, is compact in
system structure and high in separation accuracy and efficiency, and has the advantages of low
energy consumption, energy saving, environment friendliness and the like in comparison with traditional pneumatic coal separation. The invention organically combines the
microwave drying system and the dry dressing system, and widens the application range, thereby being beneficial to the popularization of the coal upgrading technology.