Spray drying system used into the fan and exhaust fan are centrifugal blower, the performance curves are described in the catalog. When selecting the fan, air volume according to the calculated value, plus a certain margin. The intake fan plus 10 to 20%. Exhaust fan plus 15 to 30%, under normal circumstances, the exhaust fan into the wind turbine larger than 20 to 40 percent, so keep the micro vacuum drying tower to avoid dust and ran workshops.
Spray dried milk powder, the general use of wind pressure into the blower 120 ~ 160mmH2O column, pressure ventilator for 180 ~ 240mmH2O column.
Pressure = air filter into the fan heater resistance + resistance + pipe resistance
Pressure = drying chamber exhaust fan dust filter resistance + resistance + resistance + exhaust system piping to maintain negative pressure inside the drying chamber
According to experience, into the duct winds of 6 ~ 10m / s, exhaust pipe winds 5 ~ 8m / s is appropriate, so the pipe diameter available flow formula.