The Dimensional Analysis of Thermal Design for the Rotary Kiln

• Main Authors: Shih-Hao Liang, 梁世豪
• Other Authors: Chen-Shyong Yen
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/99539968640325343812

碩士 === 淡江大學 === 機械工程學系 === 89 === On the basis of the Finite Difference Time Domain Method and the SimLAB 2000 simulator developed by ourselves, the main purpose of this thesis is to study the transient thermal behavior of rotary kiln, the influence of control parameters on the temperature field of bed in the kiln, and the suitable arrangements of parameters. The four essential parameters of rotary kiln in this study are rotary speed, input power, kiln length, and the fill rate of bed. The temperature distribution is calculated by several selected values of parameters. Then we use Relational Analysis of Grey System Theory to find the influential intensity of individual parameter to bed temperature field. From the simulation results, the most important parameter is input power, the less effect is the bed fill rate, and the influence of kiln length is larger than rotary speed. We use the fuzzy controller in SimLAB 2000, which consists of one parameter that is input power to control the material temperature. Consequently, with the dimensional analysis, the kiln design variables in X space are transformed into the dimensionless groups. After plotting the dimensionless diagram, we can apply the interpolation method to generate the dimensionless curve in π space. The SimLAB 2000 Simulator and the package MATLAB prove that the maximum relative errors between the simulation and interpolation results are less than 1.95%. By using the PentiumⅡ266 PC, computing interpolation results of each case costs less than one second; however, for the SimLAB 2000 Simulator, it costs about 90 minutes to compute the results. Thus, the employment of dimensional analysis and interpolation method, we can speed up the rotary kiln design work.