紧凑型吸附强化水煤气变换反应器的动力学模拟

IF 2.5 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY Frontiers in chemical engineering Pub Date : 2022-10-25 DOI:10.3389/fceng.2022.1000064
Tabea Stadler, Laila J. Bender, P. Pfeifer
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引用次数: 1

摘要

本文介绍了一种新型吸附增强水气转换反应器的动态模拟,该反应器用于电子燃料合成过程中纯CO合成气生产。由于与波动进料有关的分散装置,需要过程强化和紧凑的反应器系统。通过模拟驱动的工艺设计,得到了一套优化的工艺流程,以最大限度地提高吸附剂的负荷,使工艺运行效率达到最高。该过程的模拟是基于一个简化的非均质填充床反应器模型。该模型考虑了铜基催化剂上的同时水气转换(WGS)反应和k浸渍水滑石衍生混合氧化物上的二氧化碳吸附以及随后的脱附。根据250℃下的实验数据,选择了一个经验速率表达式来描述水气转换反应。进行了突破性的实验,并用于适应动态吸附(压力:8 bar)和解吸(压力:1 bar)参数。实验CO2吸附平衡等温线符合Freundlich模型。反应器模型被扩展为一个复杂的混合系统比例模型,用于中试工厂反应器,该反应器由六个单独可达的反应室组成。通过有限状态机实现自动开关时间调整的循环运行。一个案例研究利用了一系列反应室工艺配置的好处。结果表明,根据不同的工艺条件,通过优化操作策略可以显著提高吸附量。因此,混合模型的开发标志着向计划的中试工厂运行和控制迈出了关键的一步。
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Dynamic simulation of a compact sorption-enhanced water-gas shift reactor
This work presents the dynamic simulation of a novel sorption-enhanced water-gas shift reactor used for synthesis gas production from pure CO in an e-fuels synthesis process. Due to the intended decentralized plant installation associated with fluctuating feed, process intensification and a compact reactor system is required. An optimized operating procedure was obtained by simulation-driven process design to maximize the sorbent loading and operate the process as efficient as possible. The process simulation is based on a simplified heterogeneous packed bed reactor model. The model accounts for simultaneous water-gas shift (WGS) reaction on a Cu-based catalyst and CO2 adsorption on a K-impregnated hydrotalcite-derived mixed oxide as well as subsequent desorption. An empirical rate expression was chosen to describe the water-gas shift reaction according to experimental data at 250°C. Breakthrough experiments were performed and used to adapt kinetic adsorption (pressure: 8 bar) and desorption (pressure: 1 bar) parameters. The experimental CO2 sorption equilibrium isotherm was fitted with the Freundlich model. The reactor model was extended to a complex hybrid system scale model for the pilot plant reactor consisting of six individually accessible reaction chambers. Cyclic operation with automatized switching time adjustment was accomplished by a finite state machine. A case study exploited the benefits of a serial process configuration of reaction chambers. It could be shown that the sorbent loading can be remarkably increased through optimized operating strategies depending on the process conditions. Hence, the development of the hybrid model marks a crucial step towards the planned pilot plant operation and control.
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CiteScore
3.50
自引率
0.00%
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审稿时长
13 weeks
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