基于动态传热模型的反应器温度振荡量热法研究

Investigation on Reactor Temperature Oscillation Calorimetry Using a Dynamic Heat Transfer Model

为研究温度振荡量热法对反应器传热因子(UA)和反应热(Qr)的动态估计性能,基于热平衡理论建立了一种通用的反应器模型,模拟研究了放热工况、夹套介质流速和反应器体积对该方法估计结果的影响,并使用系统的总体时间常数(τ')对振荡量热法适用性进行量化评价。结果表明:温度振荡量热法适用于放热速率平稳的反应过程,建议在5 L以内的小型反应器中应用温度振荡量热技术,对于体积较大的反应器或变化剧烈的放热反应过程,需要增加夹套油液流速以提高τ'的大小。τ'的建议值应小于900 s,随着该值的增加,振荡周期将逐渐延长,反应过程中UA和Qr的整体估计质量也会逐渐降低。研究结果阐明了温度振荡量热法的适用性,对反应器系统的开发有重要意义。

In order to investigate the dynamic estimation performance of temperature oscillation calorimetry on reactor heat transfer factor(UA)and heat of reaction(Qr),a general calorimetric reactor model was established based on thermal equilibrium theory.The effects of exothermic working conditions,flow rate in jacket and reactor volume on the estimation results of this method were simulated,and the applicability of the oscillatory calorimetry method was quantitatively evaluated by using the overall time constant(τ')of the system.The results showed that the temperature oscillation calorimetry was suitable for the reaction process with a stable exothermic rate.It was recommended to apply the temperature oscillation calorimetry technique in small reactors within 5 L.However,it was necessary to increase the oil flow rate in jacket and to increaseτ'for a larger reactor or a drastic change in the exothermic reaction process.The recommended value ofτ'should be less than 900 s,and as this value increases,the oscillation period will gradually lengthen and the overall estimated mass of UA and Qr will gradually decrease during the reaction.The results showed the applicability of the temperature oscillation calorimetry,which is of great significance for the development of reactor system.