Chinese Wolfberry Microwave Intermittent Drying Characteristic Research And Test

In order to alleviate the energy shortage and meet the demand of the sustainable development,industrial drying should take a quick,intelligent and low-consuming method.This paper proposethe idea of combined hot-air and microwave drying process of Wolfberry to solve the low efficiency,uneven quality and high consumption of the Wolfberry air drying and records the research and experiment of the microwaving drying stage.The technology not only solves the problems of low efficiency,uneven quality and high consumption of the traditional Wolfberry hot air drying,but also improves the microwaving technology.The paper proposes technology that employs microwave intermittent drying near the end of Wolfberry drying on the basis of the hot-wind Wolfberry drying.The experiment goes like this:first,a pre-experiment was conducted according to single fact experiment,which proved that it is possible to dry Wolfberry by microwave and concluded the factors,including microwave power,microwave intermittent pulse ratio,air velocity and initial moisture content,that affect the microwave intermittent drying of Wolfberry.And then,an experiment scheme for intermittent drying of Wolfberry was made.Drying rate,energy consumption and sensuous quality were listed as criteria and were assessed by comprehensive scoring method of membership.The effects of microwave power,duty ratio,air velocity and initial moisture content to the microwave intermittent drying technology were discussed under BOX-Benhnken response surface theory,regression microwave intermittent drying of Wolfberry established,parameter of drying technology optimized.The model was proved practical by page model and COMSOL.The best parameters of this experiment:microwave power was 210W,intermittent pulse ratio was 1.8,air velocity was 0.7m/s and initial moisture content was 54%.The technology parameters provides theoretical foundations for further study of microwave intermittent drying of Wolfberry and the drying model from the analysis was MR= exp(e(a+bP+cP2)·t(d+eP+fP2))...