Control of Temperature Profile for a Rapid Catalytic Methanol Combustor
| Autor: | Chung-Hsien Wang, 王崇獻 |
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| Rok vydání: | 2009 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 97 In this study, Pt/BN/γ-Al2O3 catalyst was mixed with blank catalyst (γ-Al2O3 support) and packed in a stainless steel tube for methanol combustion starting from room temperature. The effects of catalyst density, space velocity and excess air on temperature profiles along the catalytic methanol combustor have been studied. It was also investigated to control the above mentioned factors such that the temperature of the whole combustor could be controlled between 300℃ and 500℃. Twenty one thermocouples, LabVIEW data acquisition software and related hardware were used in the experiment to record the rapid change of the temperature profile in the reactor. One thermocouple was used every 5 mm for area with large temperature gradient, and every 20 mm for area with small temperature gradient. The frequency of temperature acquisition was one per second. The Experimental results show that the catalytic combustion of methanol starts within 10 min, and the temperature can be over 500℃. The maximum temperature and maximum temperature difference in the combustor increase with increasing WHSV. Decreasing density of catalyst decreases the maximum temperature. Increasing excess air decreases the inlet temperature and the maximum temperature, however, it increases the outlet temperature. In summary, when catalyst density is 0.401 g/cm3, WHSV is 0.8 h-1 and excess air is 300%, the temperature profile of the combustor can be controlled between 295℃ and 497℃. Repeated experimental runs give similar results, indicating the reproducibility of the experiment is good. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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