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Abstract
Periodic operation of chemical reaction is a technology to improve system performance by using reaction nonlinearity.Its evaluation and optimization are still the key problems to be solved in industrial application.The nonlinear output frequency response functions method based on synchronous periodic operation of inlet concentration and inlet temperature is proposed for a typical nonlinear continuous stirred tank reactor.Firstly,the individual contribution of each periodic operation input to the system performance index is derived and analyzed;Secondly,the optimal phase difference to maximize the conversion is selected;Finally,the contribution of each order cross term of synchronous periodic modulation of inlet concentration and inlet temperature is determined.The simulation results show that the proposed method is better than the traditional NFR method and single variable NOFRFs method,and improves the accuracy of cycle operation evaluation.At the same time,the optimal design was carried out under the allowable process constraints,which significantly improved the conversion of reactants,and provided a reference for other types of chemical reaction process cycle operation evaluation and optimization.
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