Experimental Investigation of Operating Temperature on Deposition Temperature in Spray Drying Chamber
Deposition of final products from a spray dryer on a surface is a major problem and deposition temperature is one factor involved in the process. The objective of this research was to study the effect of operating temperature on deposition temperature for the surface of a spray drying chamber. Salt solution was used in the experiment and the pilot-scale spray dryer consisted of top (cylindrical) and bottom (conical) sections. The water and salt solution were sprayed at constant flow rates of 4 L/hr by a two-fluid nozzle, which used atomizer pressure of 150 kPa and compressed air at 300 kPa. The experiment consisted of three factors; two installation patterns, installation level, and three hot air temperatures of 150, 170 and 190 °C. The results showed that salt powder deposition to the conical wall and cylindrical wall did not occur so that two installation methods of cylindrical surface area have been affected with deposition temperature with statistically significant difference. The different temperature decreased less than 0.82% in the cylindrical section and 0.20% in the conical section, while the average of the difference temperature between the thermocouple directly measured and covered with aluminium tape at the wire tip was less than 0.96 °C. In our future work, the thermocouple installation technique will be applied to evaluate the relationship between deposition temperature and deposition rate in the spray drying process.
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Document Type: Research Article
Publication date: 2012-07-01
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