Fluidized bed drying of Loy Yang brown coal with variation of temperature, relative humidity, fluidization velocity and formulation of its drying rate

► Fluidized bed drying of as-received brown coal at low temperature was carried out. ► Temperature, relative humidity, fluidization velocity were examined as variables. ► Lower humidity, higher temperature and fluidization velocity are favorable for drying. ► Drying rate can be described in a simple drying equation as dw/dt = −k(1−X∗)n. ► Using n = 0.25, k can be expressed in a linear function of each variable.