Abstract
The paper describes a comparison of some results computed using a mathematical dynamic model of a single reactor bed with real temperature unsteady state transients, measured in a large industrial scale SO 2 oxidation reactor. Problems of the dynamic modelling of complete oxidation plants, including a heat exchange section and a start-up installation are discussed in the next section of the paper. As a basis for comparison some start-up dynamic transients were analysed. The analysis shows that the model (two-phase model for heat transfer and homogeneous model for mass transfer) is sufficient for qualitative analysis of the problem. The problems of obtaining reliable parameters for simulation as well as parameter sensivity of the model are also described. The plant is modelled using the dynamic flowsheeting simulator DYNAM, whose algorithm is presented against a background of similar simulators known from the literature. The major part of the paper presents the results of the identification of the model based on an actual industrial plant, together with the start-up analysis concerning the SO 2 oxidation plant. The analysis has been aimed at minimizing both the emission of SO 2 during start-up and its duration. The results are given for the various modes of the start-up operation.
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