| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 94 === This work studied the control design for catalytic packed-bed reactor in Formaldehyde production, based on the idea that the diluting the catalyst will lower the hot spot of the reactor, analysis on the effect of catalyst dilution and dilution zone was carried out and a comparison was made with the packed-bed reactor used in industry.
The first step was to determine the mathematical model; this is a highly exothermic reaction represented by a set of complex partial differential equation; By way of orthogonal collocation, the partial differential equations are transformed into a set of ordinary differential equation, this method prove to be accurate and requires a short cpu time. Thereafter, steady state and dynamic state analysis for two reactors were carried out, and the control strategies were based on the information obtained. The objective is to find the maximum product, the optimal direction was predicted by the temperature profile, and optimal productivity was obtained by control of hot spots. Finally, a comparison of the effect of disturbances on the hot spot temperature and productivity of the reactors are made.
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