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CFD-based assessment of steady-state multiplicity in a gas-solid vortex reactor for oxidative coupling of methane
Chemical Engineering and Processing: Process Intensification ( IF 3.8 ) Pub Date : 2021-04-21 , DOI: 10.1016/j.cep.2021.108434
Laurien A. Vandewalle , Guy B. Marin , Kevin M. Van Geem

Commercially viable OCM will depend largely on process intensification, i.e., innovative reactor and process design. Such an OCM reactor should have two characteristics: limited species backmixing and sufficient thermal backmixing. Short residence times with a narrow distribution have indicated that a GSVR exhibits at least the first of these two desired characteristics. Whether it also exhibits the second is less straightforward to verify. Our reactive CFD framework catchyFOAM is used to perform adiabatic simulations of a GSVR for OCM for a wide range of inlet temperatures (648 K – 1198 K), while fixing the inlet composition (CH4:O2 = 4), mass flow rate (3.6 10 −3kg s −1), catalyst mass (12 g) and total pressure (1, 2, 5 bar). This allowed to construct CFD-based bifurcation diagrams of the outlet temperature, conversions and selectivities versus inlet temperature. A wide window of steady-state multiplicity was simulated at 5 bar, with on the ignited branch a CH 4conversion of 37% and C 2selectivity of 72%, for an inlet temperature of only 698 K. This indicates that also the second criterion for an intensified OCM reactor, i.e., to allow steady-state multiplicity, can be met in a GSVR.



中文翻译:

基于CFD的气固涡旋反应器中甲烷氧化偶合的稳态多重性评估

具有商业可行性的OCM将在很大程度上取决于工艺强度,即创新的反应器和工艺设计。这样的OCM反应器应该具有两个特征:有限的物质回混和足够的热回混。具有窄分布的短停留时间表明,GSVR至少表现出这两个所需特性中的第一个。它是否也显示第二个,很难验证。我们的反应性CFD框架catchyFOAM用于在各种入口温度(648 K – 1198 K)范围内对OCM进行GSVR的绝热模拟,同时固定入口组成(CH 4:O 2  = 4),质量流量( 3.6 10  -3千克s  -1),催化剂质量(12克)和总压力(1、2、5巴)。这样就可以构造出基于CFD的出口温度,转化率和选择性与入口温度的分叉图。在5 bar下模拟了一个宽广的稳态多重窗口,在点燃的分支上,CH  4的转化率为37%,C  2的选择性为72%,入口温度仅为698K。这也表明了第二个标准在GSVR中可以满足用于增强型OCM反应器的要求(即允许稳态多重性)。

更新日期:2021-04-29
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