Start-up Time and Load Range for the Methanation of Carbon Dioxide in a Fixed-Bed Recycle Reactor,Industrial & Engineering Chemistry Research

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Start-up Time and Load Range for the Methanation of Carbon Dioxide in a Fixed-Bed Recycle Reactor
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-04-23 , DOI: 10.1021/acs.iecr.8b00755
Steffi Matthischke _{1,

2} , Stefan Roensch _{1,

3} , Robert Güttel ₂

Affiliation

Fluctuating wind and solar energy can be used to produce hydrogen by water electrolysis and subsequently for the synthetic natural gas production via methanation in the power-to-gas process. This paper investigates the unsteady-state operation of the methanation in an adiabatic and cooled fixed-bed reactor, respectively, with product recirculation by simulation of a one-dimensional fixed-bed reactor model. The results show that adiabatic fixed-bed reactors with product recirculation can operate in a wide range of partial and excess load. The recirculation of product gas cools the adiabatic fixed-bed reactor effectively and an optimal recycle ratio for the highest methane productivity exists. Cooled reactors are very sensitive to load changes of the volumetric flow rate and thus less flexible. However, the recycle of product gas allows reducing the sensitivity for a more stable operation under fluctuating feed conditions. The start-up time of cooled fixed-bed reactors is considerably lower. In summary, the flexibility of the dynamic methanation is enhanced in a loop-reactor arrangement.

中文翻译：

固定床循环反应器中二氧化碳甲烷化的启动时间和负载范围

波动的风能和太阳能可用于通过水电解来生产氢气，随后可在动力制气过程中通过甲烷化来生产合成天然气。本文通过一维固定床反应器模型的模拟，分别研究了在绝热和冷却的固定床反应器中甲烷化的非稳态操作，以及产物再循环。结果表明，带有产品再循环的绝热固定床反应器可以在很大的部分和超负荷范围内运行。产物气的再循环有效地冷却了绝热固定床反应器，并且存在用于最高甲烷生产率的最佳再循环率。冷却的反应堆对体积流量的负荷变化非常敏感，因此灵活性较差。然而，产物气的再循环降低了在波动的进料条件下更稳定运行的灵敏度。冷却的固定床反应器的启动时间大大缩短。总之，在环式反应器装置中动态甲烷化的灵活性得到增强。

更新日期：2018-04-24

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