基于NOFRFs的非等温CSTR同步周期操作的评估优化

Evaluation and Optimization of Non-Isothermal CSTR Synchronous Periodic Operation Based on NOFRFs

化学反应周期操作是利用反应非线性来提高系统性能指标的技术,对其评估与优化仍是现阶段工业应用亟待解决的关键问题.利用非线性输出频率响应函数对具有显著非线性的连续搅拌反应釜的入口浓度和入口温度同步周期操作进行评估.首先分析单个周期操作的输入对系统性能指标的单独贡献,然后确定使转化率最大化而应使用的最优相位差,最后分析入口浓度和入口温度同步周期操作的各阶交叉项的贡献.仿真结果表明:提出的方法优于传统的NFR方法和单变量NOFRFs方法,提高了周期操作评估的准确性;同时,在允许的工艺过程约束条件下进行了最优化设计,明显提高了反应物的转化率,为其他类型的化学反应过程周期操作评估和优化提供参考.

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.