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首页> 外文期刊>Journal of industrial and engineering chemistry >Experimental and model-based analysis of membrane reactor performance for methane oxidative coupling: Effect of radial heat and mass transfer
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Experimental and model-based analysis of membrane reactor performance for methane oxidative coupling: Effect of radial heat and mass transfer

机译：基于实验和基于模型的甲烷氧化偶联反应器性能的分析：径向传热和传质的影响

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摘要

Performance of the oxidative coupling of methane (OCM) reactions in a porous packed bed membrane reactor (PBMR) was analyzed using a detailed two-dimensional model which considers the mass and heat transfer in both radial and axial directions. In order to investigate the relative effects of diffusion and catalyst activity on the predicted performance of the membrane reactor, the kinetics of two different catalysts, La2O3/CaO and Mn-Na2WO4/SiO2, were implemented in the model. It was observed that the significant overprediction of methane conversion by one-dimensional model, which is sometimes twice of its real value, can be avoided using the two-dimensional model. The mechanisms through which different parameters can be exploited to improve the reactor performance were also studied. It was observed, the selectivity and yield of the desired products in membrane reactor can be significantly improved by tunning the driving force radial for heat transfer and the operating temperature inside the reactor. This is achieved by exploiting a proper set of operating temperature for pre-heating and the surrounding medium temperature. Moreover, exploiting other parameters such as feed flow rate to ensure a proper contact time and effective axial and radial convection heat transfer was also investigated. The results of the experimental investigation of the Mn-Na2WO4/SiO2 catalyst in a membrane reactor, confirmed the precision of the developed model. The reported detailed analysis in this paper enables one to predict the both reaction and thermal performance of the OCM membrane reactor and improve its design characteristics accordingly.
机译：使用详细的二维模型分析了多孔填充床膜反应器（PBMR）中甲烷（OCM）反应的氧化偶联性能，该模型考虑了径向和轴向的传质和传热。为了研究扩散和催化剂活性对膜反应器预测性能的相对影响，在模型中实现了两种不同催化剂La2O3 / CaO和Mn-Na2WO4 / SiO2的动力学。观察到，使用二维模型可以避免一维模型对甲烷转化的明显过高预测，有时这是其真实价值的两倍。还研究了可利用不同参数改善反应堆性能的机理。观察到，通过调节用于传热的径向驱动力和反应器内部的操作温度，可以显着提高膜反应器中所需产物的选择性和产率。这是通过利用适当的一组工作温度进行预热和周围介质温度来实现的。此外，还研究了利用其他参数（例如进料流速）来确保适当的接触时间以及有效的轴向和径向对流换热。在膜反应器中对Mn-Na2WO4 / SiO2催化剂进行实验研究的结果证实了该模型的准确性。本文报道的详细分析使人们能够预测OCM膜反应器的反应和热性能，并据此改进其设计特性。

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