旋转导向管喷动床干燥油菜籽的工艺优化

Experimental Study on Drying of Rapeseed in a Spouted Bed with Rotating Draft Tube

为研究旋转导向管喷动床的干燥性能,采用油菜籽为原料,进行干燥试验。选取风量、装料量、风温和导喷距等因素,范围分别为51～88m3/h(101.3kPa,0℃)、10～30kg、80～110℃和40～80mm,以水分耗热率为指标进行试验。根据单因素试验的结果,固定导喷距,按L9(34)正交试验方案进行优化试验。试验结果表明,优化工艺参数为标态风量58m3/h、风温80℃、装料量20kg。优化工艺下的水分耗热率为3941.4kJ/kg,只有风量对水分耗热率有显著影响。用SPSS软件处理正交试验数据,得到了水分耗热率与风温、风量及加料量关系的回归方程。

Rapeseeds drying in a spouted bed with rotating draft tube （RDTSB） was studied to obtain the dryer＇s drying characteristics. Taking the heat consumption per kilogram water as the criterion, the 51-88 m3/h air flow rate （101.3 kPa, 0℃）, 80-110℃ hot air temperature, 10-30 kg rapeseed load quantity and 40-80 mm distance between draft tube and spouted tube, the drying experiments were tested respectively. On the basis of these test results and the practical conditions, a scheme of orthogonal test with 3 factors and 3 levels was designed. The optimum drying parameters on the present apparatus were normal air flow rate at 58 m3/h, hot air temperature at 80℃ and wet rapeseed load at 20 kg. The optimum heat consumption per kilogram water was 3 941.4 kJ and the factor of air flow rate was significant only. By calculating with SPSS, the regression equation of heat consumption per kilogram water against hot air temperature, air flow rate and rapeseed load quantity was obtained.