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Spray Drying |
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Spray drying begins with the atomization of the feed liquid into a spray of fine droplets. Various methods are used for atomization these include using a high speed Rotary Disc, a Pressure Nozzle or a Two Fluid Nozzle.
The atomized liquid is usually sprayed into a drying chamber along with a hot gas stream, either in a co or counter current flow. Consequently, the liquid's solvent is evaporated, leaving behind the product in a form of spherical powder.
The dry powder is separated from the gas stream and collected at the bottom of the frying chamber or outside of it by means of a cyclone.
Thereafter the exhaust gas is treated to meet environmental requirements and is released into the atmosphere, or in case of a closed system, de-humidified, reheated and lead back into the drying chamber. |
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