Nomenclature
Es specific unit energy consumption
f sound frequency (Hz)
MR moisture content ratio
mW mass of water evaporated (kg)
P input electrical power (kW)
R drying rate
SPL sound pressure level (dB)
t drying time (min)
T Temperature (°C)
ug superficial gas velocity (m/s)
umf minimum fluidization velocity (m/s)
W0 initial lignite sample weight (g)
Wd,t dried coal weight at any time (g)
X moisture content values
X0 initial moisture content
X,t moisture content at any time
X∞ equilibrium moisture content at the end of drying process
△P pressure drop across the bed (Pa)