流化床反应器中甲烷-二氧化碳转化过程的高效性能研究

Methane Pub Date : 2023-01-15 DOI:10.3390/methane2010004
J. A. Pacífico, Nelson M. Lima Filho, Cesar A. Moraes de Abreu
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引用次数: 0

摘要

在973 K常压下的流化床反应器中,利用镍催化剂在细颗粒床上的效率,高效地进行了甲烷与CO2的重整反应。流化操作的特点是确定最小速度为3.11 × 10−3 ms−1和更高的速度。反应器在高达1.84 × 10−2 ms−1的表面速度下工作,提供45%到51%的转化率和97%的合成气产率。通过对该工艺假定的甲烷裂解、逆Boudouard反应、水煤气倒转反应三个反应步骤,建立了以CO2利用为重点的操作控制基础。设计用于两个区域的反应器能够同时处理表面反应和催化剂再生,使用与甲烷相关的50%过量二氧化碳的进料。在H2/CO比值为2.30 ~ 0.91的条件下,不同组分合成气的产出量随时间的变化而减小,结果可用于工艺设计。
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Efficient Performance of the Methane-Carbon Dioxide Reform Process in a Fluidized Bed Reactor
The reforming of methane with CO2 was carried out efficiently in a fluidized bed reactor at 973 K under atmospheric pressure, taking advantage of the nickel catalyst efficiency achieved with a bed of particulate fines. The fluidization operation was characterized by determining a minimum velocity of 3.11 × 10−3 ms−1 and higher velocities. The reactor worked with surface speeds of up to 1.84 × 10−2 ms−1, providing conversions from 45% to 51% and a syngas yield of 97%. The control base of the operation focused on the use of CO2 was established through the reaction steps assumed for the process, including methane cracking, reverse Boudouard reaction, and RWGS (reverse reaction of water gas-shift). The reactor designed to operate in two zones was able to simultaneously process surface reactions and catalyst regeneration using feed with 50% excess CO2 in relation to methane. Predictions indicating the production of syngas of different compositions quantified with the H2/CO ratio from 2.30 to 0.91 decreasing with space-time were validated with the results available for process design.
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