Study On Drying Characteristics Of Dyestuffed Solar Energy For Driving Heat Source

Human society’s survival and development is inseparable from energy, theconsumption of global energy becomes more and more big, the contradiction betweenenergy supply and demand has become increasingly prominent. Among them, thefossil energy consumption is in the leading position. With the further consumption offossil energy and the deterioration of the ecological environment, the developmentand demand for renewable energy increased day by day. As one of the renewableenergy, solar energy has the advantages of inexhaustible, clean and non-pollution, ithas a positive meaning for alleviating the shortage of global energy andenvironmental pollution. Yunnan province is located in the southwest of themotherland and is rich with solar energy resources. Meanwhile the local tobaccoindustry economic benefit is good. Stage of drying tobacco silk in cigarette factoriesmanufacturing process needs to consume large amounts of heat energy（150-300℃）.If we use the solar energy for heating, not only can save large amounts of fossil fuels,but also widened the field of high temperature in solar energy utilization. This paperhas mainly carried out the following works:(1) The drying system with variable diameter pipe matching with the troughconcentrator heating system is designed in detail. The V-models of metal cavityapplied to linear concentrator is suitably adopted as the collector. The experimentplatform for the cut tobacco drying heated by the trough concentrator solar collectoris completely set up, through which the related experiments are perfectly performed.The experimental data show that the heating temperature of trough concentratorheating system can better match with the temperature requirements of cut tobaccodrying system.(2) For researching the interaction of cut tobacco particles and air flow in thedrying pipe, a mathematical model of the air flow dried cut tobacco is established,and Runge-Kutta method is applied for the numerical solution, then take acomparative analysis between the simulation results and the experiment results, wefind that the relative error between them less than8%, which validate the correctness of the model.(3) The drying characteristics curves were drawn. Obtained differentfactors,such as the air flow temperature and speed, the inlet moisture content of cuttobacco, which influenced on the characteristics of cut tobacco drying. The resultsshowed that the tobacco drying rate increased with the rise of drying temperature(190℃-200℃) or air velocity (15m/s-20m/s) under the condition of the inlet moisturecontent of cut tobacco and solid-gas ratio kept unchanged. However, the rate ofdrying cut tobacco was basically the same with the change of the inlet moisturecontent of cut tobacco.