The invention discloses a rotary
hearth furnace
brown coal drying method and a rotary
hearth furnace
brown coal drying device which can dry the
brown coal at high efficiency and low consumption. The method comprises the following step of: taking overheated steam and high temperature
flue gas as a brown
coal drying heat source; taking equipment which takes a rotary
hearth furnace as a core as a drying device, uniformly distributing the dried brown
coal at the furnace bottom of the rotary hearth furnace through a reflection plate
distributor; turning the brown
coal layer through a turning mechanism in the process of rotating the furnace bottom, obtaining heat of the brown coal through heat exchange, and heating the brown coal. The device comprises a charging
system, a feeding hole, a rotary hearth furnace bottom, a furnace wall, a furnace top, a high temperature
flue gas and overheated steam inlet, a turning and
flue gas injection
system, an
exhaust gas outlet, a furnace bottom driving
system, a furnace bottom supporting roller, a furnace bottom centering roller, a discharging hole and a discharging system, wherein the turning and
flue gas injection system comprises a fixing beam, an adjusting mechanism, a
plough-shaped turning plate and a high temperature
flue gas nozzle. The brown coal with wide particle size range can be directly dried, and large-scale, rapid and low-energy-consumption drying production of the brown coal is realized.