- 學位論文
以實驗設計法及表面張力效應探討填充床吸收塔之影響因子及界面現象分析
Effects of the Surface Tension and Influence Factors on the Interfacial Phenomena of a Packed Bed by Using the Experimental Design Methodology
摘要
為探討填充床吸收塔吸收揮發性有機化合物(VOCs)之質傳性能及質傳現象，本研究首先以有機類之三乙基乙二醇水溶液對於甲苯、甲醇、乙醚及丁酮等VOCs進行吸收作用，進而探討各操作條件對質傳係數之影響。其次，研究中亦以二水準因子之實驗設計法對於影響研究中響應值(質傳係數)之各實驗因子進行規劃，其目的在於以較少的實驗組合而得合理及準確之分析結果。此外，亦採用統計學上之變異數分析法(ANOVA)說明實驗因子對響應值（Response Value）之影響及因子間之交互作用關係。而各實驗因子之高低水準則設定如下：吸收劑流量（1.24、1.43 kg/min）、氣體流量（2.9、2.97 kg/min）、吸收劑濃度（91.5、96.5 wt%）、入口空氣VOCs濃度－甲苯（62、110 ppm）、甲醇（210、369 ppm）、乙醚（58、155 ppm）、丁酮（105、205 ppm）。此外，吸收劑與揮發性有機化合物間之表面張力差所造成之界面擾動現象亦為本研究之另一主題，結果亦證實質傳過程所造成之界面擾動現象將有助於吸收過程中質傳性能之提升。
並列摘要
In order to investigate the mass transfer performance of volatile organic compounds (VOCs) absorbed by packed bed a absorber, the processes of toluene, methanol, ethyl ether and ketone absorbed by organic triethylene glycol solutions were conducted in this study . Effects of operating conditions on mass transfer coefficient were also studied. Since the response values (mass transfer coefficients) were influenced by experimental factors, the two-level factorial experimental design methodology was used to set operating conditions of experimental factors. The purpose of this method is to obtain reasonable and accurate results by the fewer experimental runs. In addition, effects of experimental factors on the response value and interactions between factors were explained by the analysis of variance (ANOVA) statistically. The high and low level of experimental factors were set as following: 1.24 and 1.43 kg/min absorbent flow rate, 2.9 and 2.97 kg/min air flow rate, 91.5 and 96.5 wt% absorbent concentration. VOCs concentrations of inlet air are 62 and 110 ppm for toluene, 210 and 369 ppm for methanol, 55 and 150 ppm for ethyl ether, and 105 and 205 ppm for ketone. Finally, interfacial disturbance phenomena induced by the surface tension gradient between absorbent solutions and the condensed vapors of VOCs is another subject in this study. The results demonstrated that the interfacial disturbance phenomena induced by the mass transfer process would increase the mass transfer performance during the absorption process.