EXPERIMENTAL RESEARCHING ON INFLUENCE DETERMINATION OF HOT AIR VELOCITY TO THE REFINED SUGAR DRYING ON THE MODEL OF PULSED COUNTINUOUS FLUIDIZED BED

Abstract

Experimental research  on refined sugar (RS) drying were conducted on the single factor experiments in a model of pulsed continuous fluidized bed which its capacity was 20kg/h. The experiment was performed in conditions such as the 04 (four) fixed technological parameters during experiments that including the height of basical dried layer (H₀) is 65mm, the hot air temperature(t_g,) is 70^Oc, pulsed frequency (f)is 0,5Hz and the mean diameter of RS (d_p)is 0,8mm while the range of hot air velocity was adjusted from 1¸ 3m/s. The experimental results were obtained the moisture content of finished product was 0,06% ( the dried grains quality met the TCVN 6958:2001),the specific heat consumption was 1008kJ/kg finished product),the specific electical consumption was 194 Wh/ kg finished product and the efficiency of finished product was 88%. It is based on the results of the single factors of the correlation relationship between the four technological parameters(t,H₀,d_p,f) which affects to the four objective functions(M₂,q,N, h) of pulsed fluidized bed drying for the RS sugar. The author etablished a suitable drying regime such as the temperature of hot air was 75^OC, pulse frequency was 0.6 Hz, mean diameter of RS grain was 0,4 mm and hot air velocity was 2.2 m/s.