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URN etd-0902108-174205 Statistics This thesis had been viewed 2427 times. Download 1074 times. Author Chung-ping Hsu Author's Email Address No Public. Department Chemical Engineering Year 2007 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 66 Title Effect of Methanol Feed Rate and Excess Air on Transient Temperature Profile of a Rapid Catalytic Combustor Keyword Methanol Rapid Catalytic Combustor Rapid Catalytic Combustor Methanol Abstract It is the objective of this research to study the effect of space velocity, excess air and feeding position on transient temperature profiles of a rapid catalytic combustor (RCC) during cold start-up. The RCC was made by two concentric stainless-steel tubes, with Pt/BN/γ-Al2O3 catalyst filled in the annual area. There are 30 thermocouples in the inner side and 12 around the outer side. All the temperature signals were acquired every second in order to record the quick change of the temperature profile of RCC in the computer.
Experimental results of methanol combustion show that when WHSV is 0.147 h-1 and excess air is 20%, the temperature of RCC can be raised from room temperature to 200℃ in 5 min, 420℃ in 20min, and 682℃ in 3h. The results also show that temperature of RCC increases with increasing WHSV; increasing excess air decreases the temperature difference between the inlet and outlet of RCC; and feeding at the top of RCC has better combustion than feeding at the bottom does.
Reproducibility of temperature profile has been obtained for the combustion of methanol in RCC, indicating the experimental data is feasible and the catalyst does not deactivate. Analysis of outlet gas composition by GC reveals that at the initial stage of reaction, combustion is not completed, and water and methanol adsorb on the low-temperature catalyst at the rear part of combustor; at the middle stage of reaction, abovementioned water and methanol desorb from the catalyst. In the meantime, it results in a two-stage temperature increase at the rear part of the catalytic combustor.
Advisor Committee Jan-Chen Hong - advisor
none - co-chair
none - co-chair
Files Date of Defense 2008-07-29 Date of Submission 2008-09-02