The rotary drum dryer is a directfired hot air cascading type of dryer, which dries sludge to between 90 to 95 % dry solids. The material is gently dried as it cascades through the hot air flow. The hot air stream is provided by a directfired gas burner normally operating with natural and biogas.
R = the gas constant, whose value depends on the units of P, V, n, and T T = absolute temperature of the gas The equation may also be written as PV=nRT Where = (V/n) is the molar volume of the gas. A gas, whose PVT behavior is well represented by the above equation, is said to behave as an ideal gas or perfect gas. Standard conditions