Grain Fluidized Drying Experiment Research And Numerical Simulation

Speeding up the agricultural development is pointed out in the centre No.1files of our country in ten consecutive years. And food safety problems are paid close attention. According to statistics, there are more than500thousand tones grain are lost caused by mildew every year because of the lacks of drying equipment. Moisture content of new grain is very high, which must through drying to achieve the standard of safe storage. In order to reduce the grain loss and improve the safety coefficient, it has been imperative for agricultural development to research suitable drying technology and develop efficient and flexible grain drying equipment, which has an important influence on reducing the grain loss in storage and drying process.Soybean, bean, and wheat as test object, a small dry test rig was manufactured. According to the single factor analysis method, analyzed the effect of the inlet wind speed, inlet wind temperature and particle size on heat and mass transfer of the above three kinds of particles in the process of fluidized drying. Through theoretical analysis, experimental study and numerical simulation of grain drying process to make in-depth research, map the drying curves with different drying parameters, and make comparative analysis with simulation.Test results show that increase the temperature of the inlet medium and the frequency of the entrance fan, the drying rate of soybean, bean, and wheat will increase when fluidized dry the same food, the influence on the drying rate of wheat is greatest especially. Under the same wind speed and wind temperature, the smaller the particle is, the smaller the equivalent diameter is, the heat transfer coefficient of food will increase, and the faster the drying rate is. In addition, establish heat mass transfer mathematical model of fluidized porous media through the finite element method, simulate thermal mass transfer regularity of soybean drying process, the test results are good agreement with simulation results, which shows that it is feasible for engineering practice to use ANASYS finite element method to simulate fluidized dry grain.