Fluidized bed drying is an important unit operation in many production processes.This process involves fluid flow,heat transfer,mass transfer,phase change and other processes,which is complex on the whole.The continuous drying process has the characteristics of high inertia and nonlinearity,making it difficult to accurately design and control the process.In order to better understand the parameter distribution and dynamic characteristics inside the fluidized bed dryer,the research was conducted from the perspective of mechanism simulation.The drying process was simulated by dividing the equipment space into multiple unit blocks in a quasi two-dimensional manner.A differential model for material balance,heat balance,and heat&mass transfer processes was established within the unit block.Due to the unstable nature of the drying process,the fourth order Runge Kutta method was used to numerically calculate the differential equations within the unit block.A solid and gas flow model was established between the unit blocks.A unit block simulation platform software was developed by C#,and the calculation program within the unit block and the calculation of flow between cells were implemented on it.This method was applied to simulate the fluidized bed dryer.The software can get the temperature and humidity distribution in the dryer,and it can carry out certain dynamic simulation of the dryer.
关键词
流化床干燥器/动态模拟/软件开发/微分方程/单元块法
Key words
Fluidized bed dryer/Dynamic simulation/Software development/Differential equations/Unit block method
维普
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