The invention provides a method and a device for the
drying and the
quality enhancement of lignite. The device comprises a
drying / sieving device, a preheating and
drying / sieving device, a
hot blast heater, a
drying drum, a vibration
fluidized bed, a
cyclone separator, a
defogger and a dust remover. The
hot blast heater is respectively connected to the
drying drum and the vibration
fluidized bed, and an outlet of the preheating and drying / sieving device is respectively connected with the
drying drum and the vibration
fluidized bed. The preheating and drying / sieving device divides the lignite into two stages of big particle
diameter and
small particle diameter, high-temperature
flue gas generated by the
hot blast heater is used as a heating medium, the temperature of the
flue gas is regulated by the residual low-
oxygen gas after
oxygen gas is separated by using an
air separation system, the drying drum and the vibration fluidized
bed are used for producing the quality-enhanced lignite with the big particle
diameter and the
small particle diameter, different production requirements are met, and part of exhausted
tail gas is circularly used for preheating the raw materials of the lignite after being defogged. The invention respectively carries out drying and
quality enhancement on the lignite according to the sizes of the particle diameters by grading equipment, eliminates the problem of uneven drying caused by different particle diameters, realizes the effective
quality enhancement and the comprehensive utilization of
coal resources, and is used for the large-scale process of drying and quality enhancement of the lignite.