Abstract Mechanistic models are commonly used to simulate gas-fluidized bed reactors. Gas is assumed to pass through two compartments in parallel, one a dilute phase and the other a dense phase containing most, or all of, the particles, as well as interstitial gas. Interphase mass transfer plays a key role, since most of the gas passes through the dilute phase, while most reaction occurs in the dense phase. For reactions with changes in molar gas flow, this creates a dilemma, as the extent to which, and rate at which, the change in volumetric flow is distributed between the phases are unclear. The results are especially important when there is a substantial decrease in volumetric flow that could cause defluidization of the dense phase. This paper considers steam methane reforming and its reverse reaction, methanation, to investigate two limiting cases where the molar gas flow greatly increases and decreases, respectively.

中文翻译：

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摩尔流量和体积流量发生重大变化的气体流化床反应器的模拟研究

摘要 机理模型常用于模拟气体流化床反应器。假设气体平行通过两个隔室，一个是稀相，另一个是包含大部分或全部粒子以及间隙气体的密相。相间传质起着关键作用，因为大部分气体通过稀相，而大多数反应发生在密相中。对于摩尔气体流量变化的反应，这会造成两难境地，因为体积流量变化在各相之间分布的程度和速率尚不清楚。当可能导致密相脱流的体积流量显着降低时，结果尤其重要。本文考虑了蒸汽甲烷重整及其逆反应，甲烷化，