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Significance of methanation reactor dynamics on the annual efficiency of power-to-gas -system
Renewable Energy ( IF 8.7 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.renene.2020.09.029
Eero Inkeri , Tero Tynjälä , Hannu Karjunen

Abstract Power-to-gas (PtG) is one option to integrate more renewable electricity production to the energy system, by offering flexible load, seasonal energy storage and low-GWP (Global Warming Potential) methane. The first step of the PtG process, hydrogen production by water electrolysis, requires electricity with low specific CO2 emissions. Therefore, the operation of electrolyser is most likely variating according to the intermittency of renewable electricity production. The downstream processes of PtG should be capable to follow the dynamics and utilize the produced hydrogen, avoiding curtailment. This could be done with a very dynamic reactor system, or with aid of buffer storages for feed gases. This paper studies the effect of dynamic properties of methanation reactor, hydrogen buffer storage and electrolyser full load hours on PtG system efficiency. The operation of electrolyser is following intermittent renewable electricity production and electricity markets, leading to varying full load hours (FLH) with different characteristics. Enhancement of single parameters related to thermal dynamics of the reactor could improve the system efficiency more than parameters related to the loading of the reactor. Coupled threshold were found for FLH and H2 storage size, after which average efficiencies became nearly similar as in steady-state operation.

中文翻译:

甲烷化反应器动力学对电转气系统年效率的意义

摘要 电转气 (PtG) 是将更多可再生电力生产整合到能源系统中的一种选择,它提供灵活负载、季节性储能和低 GWP(全球变暖潜势)甲烷。PtG 工艺的第一步,即通过水电解制氢,需要具有低特定 CO2 排放量的电力。因此,电解槽的运行很可能会根据可再生电力生产的间歇性而变化。PtG 的下游工艺应该能够跟踪动态并利用产生的氢气,避免限电。这可以通过非常动态的反应器系统来完成,或者借助原料气的缓冲存储器来完成。本文研究了甲烷化反应器动态特性的影响,氢缓冲存储和电解槽满负荷小时数对 PtG 系统效率的影响。电解槽的运行遵循间歇性可再生电力生产和电力市场,导致具有不同特性的不同满载时间 (FLH)。与反应堆负载相关的参数相比,与反应堆热力学相关的单个参数的增强可以提高系统效率。发现了 FLH 和 H2 存储大小的耦合阈值,之后平均效率变得几乎与稳态操作中的相似。与反应堆负载相关的参数相比,与反应堆热力学相关的单个参数的增强可以提高系统效率。发现了 FLH 和 H2 存储大小的耦合阈值,之后平均效率变得几乎与稳态操作中的相似。与反应堆负载相关的参数相比,与反应堆热力学相关的单个参数的增强可以提高系统效率。发现了 FLH 和 H2 存储大小的耦合阈值,之后平均效率变得几乎与稳态操作中的相似。
更新日期:2021-01-01
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