Analytic Solution of Mass Conservation Equation for Drying Process

Deep-bed drying is an integrated process affected by many different factors. In this regard, the nature of deep-bed drying phenomenon was discussed, and the models and mass equilibrium equations for deep-bed hot-air drying process were constructed for the study. The material dehydration process, medium humidification process and system equilibrium were analyzed. The dimensionless numbers were introduced to simplify and solve the differential equations of deep-layer drying. Furthermore, the analytical formula and solution of the deep layer hot-air drying process were given. The results provided a kind of simple and practical analytical formula and calculation method, which are the base to hold the characteristics of deep-layer drying system well, and realize the accurate control of process.