Dear all, I am working on the spray drying of fruit juice concentrate. I want to fix the outlet air temperature to 70±5°C. Is this feasible as I read in many papers that the outlet air temperature varies with the inlet air temperature and feed rate? If yes, how can I do this? Will fixed outlet temperature affect responses like bulk density, hygroscopicity, and solubility? How can I measure this effect? We have a laboratory-scale co-current spray dryer available in our lab.
Dear Mamta, usually with the spray dryer mentioned, the heating and temperature control system is linked to the inlet section only. Depending on the inlet temperature, the outlet temperature gets fixed itself which is usually 5-10 units lower than the inlet and cannot be controlled or changed. The only way to vary and fix it is to vary the inlet temp. and feed rate. Inlet temp. is directly proportional to outlet temp. while reverse condition for the feed rate.
Mamta Thakur : excuse me mamta, how can i find some information about cold spray dryer?
Mamta Thakur Hi Mamta Thakur! You want fix outlet temperature in spray draying process (and you 700C need)? Yes, usually on the spray dryer heating and temperature control system is linked just inlet section. Can you write temperature of your inlet thermal agent? (I think yoy can calculate it by mathematical-phisical methods of modelling).
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