Study On The Kinetics Of Rayon Staple Drying And Simulation For The Dryer’s Air Distribution Plate

Drying and heat setting of hydrous rayon staple is one of the important production process in textile industry. This process not only confirms the physical and mechanical properties of finished product fiber after drying, but also effects the final quality of fiber definitively. Meanwhile, this process is also a energy-intensive process. In this paper, the drying characteristics of rayon staple drying in the through chain plate dryer and the flow field and pressure field of chain plate dryer are researched. The results have a certain guiding significance on improving the efficiency of viscose staple fiber and reducing the energy consumption of the drying process. The main researches are listed as follows:(1) Setting up a simulation equipment in the laboratory on the basis of ra yon staple drying in the through chain plate dryer. The effects of four factors on the drying process were studied on these conditions:the ai-r temperature100-140oC, the material thickness90-170mm, the inlet a-ir velocity1.2-1.6m/s. the water ratio of material90-170%.On the basis of the experimental research, using mathematical statistics method, mo-del comparison, a kinetic model of rayon staple drying was build as f-ollows:MR=Aexp(-Bt)+C, and the respective expression of A、B、C were presented. The model was tested by the experiment. The results s-how that the model estimating value were in good agreement with ex-perimental data; the model can be used to describe the drying characte r-ristic of rayon staple. The expression of A、B、C are listed as follo-ws: A=432.044-3.241T-76.257V+0.011T2+22.039V2B=-0.739+0.12T+0.23V-5.285*10-5T2C=76.326-2.482T+115.976V+0.01T2-40.552V2(2) The flow field of large size chain plate textile fiber dryer is researche d by numerical simulation based on ANSYS Workbench. With air distr-ibution plate of different aperture ratio, the internal flow field and the overall pressure distribution is simulated. The results show that the ap-erture ratio of air distribution plate1,2,3are18.5%、25.7%、22.5%se-parately,which could improve the non-uniformity of air distribution co -ndition above fiber layer and increase the mean velocity of upper area of fiber layer and achieve better fiber drying effect.