ENERGY ANALYSIS ON USE OF AIR AND SUPERHEATED STEAM AS DRYING MEDIA

The physical properties of air and superheated steam were analysed in a range of temperatures applied in paper and paperboard drying process es. On the basis of tests carried out on a pilot stand the values of e nergy indices for air and steam drying processes are compared. With th e drying media temperature as T-M = 300 degrees C, nozzle velocity v = 60 m/s and using the Huang and Mujumdar model as well as relationship s given by Chance a comparative analysis of the results has been carri ed out. Variation of several indices in the range of temperatures 100- 600 degrees C and various nozzle velocities was studied.