The invention discloses a
brown coal drying method and device utilizing
waste heat of
smoke and steam of a power
plant. The
drying method comprises two-time
drying treatment, wherein the two-time drying treatment comprises the steps that firstly, the high-temperature
smoke directly discharged by a power
plant coal fired boiler is utilized for conducting first-time drying treatment on damp materials, the high-temperature
smoke directly makes uniform contact with the damp materials, and intermediate materials are obtained; and secondly, the high-temperature smoke and the high-temperature steam directly discharged by the power
plant coal fired boiler are utilized for conducting second-time drying treatment on the intermediate materials at the same time, the high-temperature smoke directly makes uniform contact with the intermediate materials, meanwhile, the intermediate materials make uniform contact with a heat exchange
pipe inflated with the steam for heat exchange, dried materials are obtained, and second-time drying treatment is achieved. The
brown coal drying method and device have the beneficial effects that the power plant
waste heat serves as a heat source for
brown coal drying, the running economical efficiency of a power plant generator set is improved, a
system for drying the brown
coal and a brown coal
power generation system are integrated, efficient utilization of power plant energy and optimization of a
technology system are achieved, and the brown coal drying method and device belong to the poly-generation technology of the power plant.