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首页> 外文期刊>Separation and Purification Technology >Modeling and parameter estimation for a fixed-bed adsorption process for CO2 capture using zeolite 13X
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Modeling and parameter estimation for a fixed-bed adsorption process for CO2 capture using zeolite 13X

机译：使用13X沸石固定床吸附CO2的吸附过程的建模和参数估算

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摘要

Modeling of a fixed-bed adsorption process for CO2 capture using zeolite 13X was performed through parameter estimation. An empirical mass transfer rate model is proposed as a relevant description of the adsorption dynamics of CO2/N2 on zeolite 13X. An efficient objective function for the estimation of the mass transfer rate parameters was devised to avoid the local minimum and to improve the convergence to the desired solution. Langmuir isotherm equation coefficients, bed porosity, average particle size, and heat transfer coefficients were determined in separately designed experiments. The porosity estimate was updated during the estimation of mass transfer rate parameters to account for the effect of pore diffusion on bulk flow. To ensure numerically stable computation, the gradient-directed adaptive predictive collocation method was adopted with a cubic spline interpolation function and far-side boundary conditions. The model was experimentally evaluated in an adsorption bed with a height of 70 cm and an inner diameter of 2.54 cm and shown to predict the dynamic behaviors of the process variables with high accuracy.
机译：通过参数估算对使用13X沸石进行的CO2捕集固定床吸附过程进行了建模。提出了经验传质速率模型作为13X沸石上CO2 / N2吸附动力学的相关描述。设计了用于估计传质速率参数的有效目标函数，以避免局部最小值并提高对所需解决方案的收敛性。 Langmuir等温线方程系数，床孔隙率，平均粒径和传热系数在单独设计的实验中确定。在估计传质速率参数期间更新孔隙度估计值，以说明孔隙扩散对整体流量的影响。为了确保数值稳定，采用了具有三次样条插值函数和远侧边界条件的梯度定向自适应预测搭配方法。在高度为70 cm，内径为2.54 cm的吸附床上对模型进行了实验评估，结果表明该模型可以高度准确地预测过程变量的动态行为。

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