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首页> 外文期刊>Chemical Engineering Science >Experimental and modeling studies on the low-temperature water-gas shift reaction in a dense Pd-Ag packed-bed membrane reactor
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Experimental and modeling studies on the low-temperature water-gas shift reaction in a dense Pd-Ag packed-bed membrane reactor

机译：致密钯-银填充床膜反应器中低温水煤气变换反应的实验与模型研究

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摘要

In this work, an experimental and modeling study is described, focusing on the performance of a Pd-Ag membrane reactor recently proposed and suitable for the production of ultra-pure hydrogen. A packed-bed membrane reactor (MR) with a "finger-like" membrane configuration has been used for carrying out the water-gas shift reaction (WGS) in the region of low temperature operation using a simulated reformate feed.The experiments were performed under a broad range of operating conditions of temperature (200-300°C) and space velocity (1200-10,800LNkgcat-1h-1); the effect of feed pressure (1-2 bar) was also analyzed, as well as the operating mode at the permeate side: vacuum (30mbar) or sweep gas (1.0 bar; nitrogen at 1LNmin-1). A one-dimensional, isothermal and steady-state model is proposed, which assumes axially dispersed plug flow pattern and pressure drop in the retentate side and plug flow with constant pressure in the permeate side. An innovative composed kinetic model was also used to describe the catalytic activity of the catalyst for the WGS reaction. In general, the simulation results showed a good agreement to the experimental data, in terms of carbon monoxide conversion and hydrogen recovery (and also outlet retentate composition) using only two fitting parameters related to the decline of H_2 permeability due to the presence of CO. Both simulation and experimental runs showed that the MR achieves high performances, for some operating conditions clearly above the maximum limit for conventional packed bed reactors. The performance reached is particularly relevant when hydrogen is recovered via sweep gas mode (a high sweep flow rate was employed), because a lower partial pressure could be reached than using vacuum pumping. In the first case, almost complete CO conversion and H_2 recovery could be reached.
机译：在这项工作中，描述了一项实验和模型研究，重点是最近提出并适用于生产超纯氢的Pd-Ag膜反应器的性能。已使用具有“手指状”膜构造的填充床膜反应器（MR）在低温操作区域内使用模拟重整产品进料进行水煤气变换反应（WGS）。进行了实验在温度（200-300°C）和空速（1200-10,800LNkgcat-1h-1）的广泛操作条件下;还分析了进料压力（1-2 bar）的影响，以及渗透侧的操作模式：真空（30mbar）或吹扫气（1.0 bar;氮气为1LNmin-1）。提出了一个一维等温稳态模型，该模型假定轴向分散的塞流模式和截留侧的压降以及渗透压恒定的塞流。创新的合成动力学模型也用于描述催化剂对WGS反应的催化活性。通常，在仅使用两个因CO的存在导致H_2渗透性下降的拟合参数的一氧化碳转化率和氢气回收率（以及出口渗余物组成）方面，模拟结果与实验数据吻合良好。模拟和实验运行均表明，在某些运行条件下，MR明显高于常规填充床反应器的最大极限，从而实现了高性能。当通过吹扫气模式（采用高吹扫流速）回收氢气时，达到的性能尤其重要，因为与使用真空泵相比，可以达到较低的分压。在第一种情况下，可以实现几乎完全的CO转化和H_2的回收。

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