The invention relates to a centralized
drying system of high-
humidity grain and a
drying method thereof. According to the grain deliver direction, the centralized
drying system comprises a preliminary cleaning
machine, a wet grain hoister, a wet grain dryer, a conveyor, a middle hoister, a main drying
tower, a dry grain conveyor, a dry grain hoister and a dry
grain storage silo which are successively connected, wherein the main drying
tower successively comprises a high-temperature drying section, a low-temperature drying section and a cooling section; the
system also comprises a hot-blast stove, a
heat exchanger, a dust remover and a
smoke draught fan which are successively connected, wherein the
smoke draught fan is connected with the wet grain drier; the
heat exchanger is connected to the main high-temperature drying section by an
air heater, and the
air heater is connected to the low-temperature drying section by a thermosistor; the
heat exchanger is connected with the wet grain drier by a wind stopping device and an air cooler; and
ambient air is communicated with the air cooler by the cooling section. The drying system can fully utilize natural air and recycle the waste heatand
waste gas of the drying system to efficiently dry in an energy saving mode and reduce drying
waste gas, waste liquid and
dust emission; the drying system has favourable drying effect and is especially suitable for drying a great quantity of high-wet grain in a centralized mode.