Modeling Of Indirect Drying Equipment And Software Program With Object Oriented Method

In this paper, studied with indirect dryer, based on the item of "indirect dryer design", Object-Oriented(O-O) technology is applied and carried out in the indirect dryer CAD design system with the core of heat and mass transfer and intension model.With the modified particle heat transfer model, the heat and mass transfer model of the indirect dryer is set up. The heat transfer coefficient of pan rotary dryer and tube rotary dryer are correctly calculated. The humidity distributing of the material in tube rotary dryer is also calculated. To pan rotary dryers, We make sure that the contact time of every contact process is the equal contact time of the material particles which contact the heat pan. The total segments are the total number of the pans. To tube rotary dryers, We make sure that the contact time of every contact process is the 480 degree circumrotation time of the dryer rotor. The simplified strength models of some kinds of indirect dryers are set up. We also analysis the stress of the pan by FEM software. The pan's stress results of FEM accord with the results of the model which we set up. In addition, thermodynamics and intension model are used to design the indirect dryers successftilly.(See the appendix)Furthermore, with the Object-Oriented programming method, the computer aided design (CAD) software of indirect dryers is developed in Windows NT 4.0 system and Visual C++ 6.0 environment including calculation of drying process~ heat and mass transfer and intension. Two kinds of indirect dryer's designing instances testify that the models and computer aided design software is convenient, effective, and reliable. At last, we make a prospect of the future development of the indirect dryer.The innovations of this paper consist in these points. The heat and mass transfer model of indirect dryers is set up by modifying and usingIIthe particle heat transfer model. The models of total contact time and single contact time aiming at the pan rotary dryer and tube rotary dryer are set up. The intension model of indirect dryers is set up by simplifying the load of the dryers. The computer aided design (CAD) software of indirect dryers is developed in Windows NT 4.0 system and Visual C++ 6.0 environment by using the 0-0 method. The dryer models are used in the design of many types of pan rotary dryers and tube rotary dryers. It proved that the models and CAD software have good theory guidance and application value to design of some type indirect dryers.