This invention discloses a
drying and crushing method for mixed-size, high-
moisture, low-rank
coal, belonging to the field of low-rank
coal drying. It solves the problem that existing low-rank
coal drying processes, which strictly limit the feed particle size, make drying and crushing soft low-rank coal with mixed particle sizes difficult. The drying and crushing method includes: Step 1, adding mixed-size, high-
moisture, low-rank coal to a preheating and crushing unit for
processing; Step 2, using a primary separation device to perform gas-
solid separation on the preheated and crushed low-rank coal; Step 3, a drying unit to dry the incoming low-rank coal; Step 4, using a secondary separation device to perform gas-
solid separation on the dried low-rank coal; Step 5, the separated, dried, small-particle-size, high-temperature low-rank coal enters a
settling device to exchange heat with
fresh air, and the cooled small-particle-size low-rank coal is the final product, discharged from the
system. This invention achieves the crushing and drying of mixed-size, high-
moisture, low-rank coal.