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首页> 外文期刊>Chemical Engineering Science >Numerical study of hydrogen production via sorption-enhanced steam methane reforming in a fluidized bed reactor at relatively low temperature
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Numerical study of hydrogen production via sorption-enhanced steam methane reforming in a fluidized bed reactor at relatively low temperature

机译：较低温度下流化床反应器中吸附增强型甲烷蒸汽重整制氢的数值研究

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Production of hydrogen by sorption enhanced methane steam reforming (SE-SMR) process at a relatively low temperature in a two-dimensional cylindrical bubbling fluidized bed reactor was studied using an Eulerian-Eulerian approach. The study aims to investigate the influence of operating pressure, superficial velocity, catalyst-to-adsorbent ratio (C/A, weight) and sorption kinetics on the SE-SMR process. A H_2 concentration of >87% on a dry basis can be obtained at 500°C and 0.1MPa using hydrotalcite-like compounds (HTC) as CO_2-acceptor. A relatively low catalyst-to-adsorbent ratio (~0.5) is preferable for reducing operating cost and enhancing hydrogen production. Higher operating pressure is favorable for the utilization of sorbent, but unfavorable for the conversion of methane. Simulations prove that sorbents with slow kinetics can only serve as CO_2 acceptor, but cannot enhance the methane steam reforming (SMR) process effectively. Another interesting observation is that the way the superficial velocity affects the CO_2 capture efficiency is determined by the sorption kinetics. For HTC, it is the bigger bubble size rather than the reduction of gas residence time that mainly accounts for the decrease of the CO_2 capture efficiency under higher velocities investigated.
机译：使用欧拉-欧拉方法研究了在二维圆柱鼓泡流化床反应器中在较低温度下通过吸附增强甲烷蒸汽重整（SE-SMR）工艺生产氢的方法。该研究旨在研究工作压力，表面速度，催化剂与吸附剂之比（C / A，重量）和吸附动力学对SE-SMR工艺的影响。使用类似水滑石的化合物（HTC）作为CO_2受体，在500°C和0.1MPa的条件下，H_2的干基浓度> 87％。相对较低的催化剂与吸附剂之比（〜0.5）对于降低运行成本和提高氢气产量是优选的。较高的操作压力有利于吸附剂的利用，但不利于甲烷的转化。仿真表明，动力学缓慢的吸附剂只能作为CO_2受体，不能有效地提高甲烷蒸汽重整（SMR）过程。另一个有趣的发现是，表面速度影响CO_2捕集效率的方式由吸附动力学决定。对于HTC，是更大的气泡尺寸而不是减少气体停留时间，这主要是在研究的较高速度下降低了CO_2捕集效率的原因。

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