VINAMILK 24 11 03

Modern Types of Spray Drying Plants for the Dairy & Food Industry One-stage Drying (1CSD) K64 KØ - - Drying of droplets in hot air Temperature oC • Relation between air temperature, product temperature and drying time 500 400 300 Air temperature 200 100 Product temperature Start of drying 5 End of drying Heat transfer to solids by convection Internal heat transfer Evaporation Internal diffusion of water vapour External mass transfer by convection Typical temperature profile measured in the drying chamber 200 -110 o C 110 -105 o C 105 -100 o C 100 - 95 o C 95 - 80 o C 80 - 60 o C 60 - o C T out : 200 o C T in : 100 o C Two-stage Drying (2CSD) powder outlet K64 KØ - - 3-stage spray dryer with fines return powder outlet K64 KØ - - Spray bed dryer with fines return K64 KØ - - Mollier diagram Tall-form spray drying plant with bustle (TFDB) and external fluid bed K64 KØ - - 3-stage Conical Spray Dryer (3CSD) 10 8 K64 KØ - 10 - Air heater Air distributor Atomizer Feed System Drying chamber Integrated fluid bed External fluid bed Fluid bed air supply systems Cyclone 10 Bag filter Insulation Panels K64 KØ - 33 - Spray Bed Dryer with air broom K64 KØ - 34 - Inside view in Spray Bed Dryer (SBD) with air broom Air Broom means longer running hours and less down time Better than wall sweep for keeping the chamber wall clean No need for hammers K64 KØ K64 KØ - 35 - Integrated Fluid Bed powder outlet K64 KØ - air inlet air outlet Integrated fluid bed with central air duct The weir in the powder outlet defines the average residence time of the powder For prevention of explosion risk, a rotary valve will often be placed in the powder outlet K64 KØ - Features and functions for external fluid bed Drying Cooling K64 KØ - 38 - } General purpose Rewetting Agglomeration, instantizing Lechithination Instantizing Separation Classification Mixing Standardization, dry mixing Conveyance Gentle Powder photo Non-agglomerated powder Agglomerated powder K64 KØ - 39 - Inlet mixed fluid bed (IMFB) Back-mix enables you to handle more difficult products K64 KØ - Fluid bed rewet agglomeration Air outlet Powder inlet Silo Bag filter Cyclone Rewetting system Pneumatic conveying Air inlet K64 KØ - Powder outlet Uniform and steady feed of powder Uniform liquid distribution Nozzle set-up Plant picture Milupa K64 KØ - Rotaclean Filter K64 KØ - Sanitary Flexible Connection Flexible connection Clamp ring Rubber band K64 KØ - Duct Cleaning in Place - CIP K64 KØ - Control system K64 KØ - 46 - Rebuilding of old Dryer K64 KØ - [...]... air heater Process air outlet Combustion air inlet Flue gas outlet Burner Liquid-coupled heat exchanger Recuperator Exhaust duct Concentric cylinders Combustion chamber Process air inlet Fan K64 KØ - 11 - Preheater Inspection door / Pressure relief valve Air distributor designed for centrifugal as well as nozzle atomizer Uniform air distribution Designed for nozzle or centrifugal atomization and fines... atomizer Product Product Fines The HP nozzle atomizer is flexible and unique, suitable for agglomeration Air distributor Peripheral nozzle Central nozzle K64 KØ - 23 - Nozzle Atomizer in stand K64 KØ - 24 - Centrifugal atomizer Advantages • Is uncomplicated with regard to operation • Insensitive to changes in capacity (with the capacity range) • Insensitive to changes in viscosity • Insensitive to some