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| Hauptseite > Publikationsdatenbank > Near Carbon-Neutral Power Generation by DME in sCO2 Oxy-Combustion Cycles |
| Hauptseite > Publikationsdatenbank > Near Carbon-Neutral Power Generation by DME in sCO2 Oxy-Combustion Cycles |
| Contribution to a conference proceedings | FZJ-2026-03953 |
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2026
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Please use a persistent id in citations: doi:10.34734/FZJ-2026-03953
Abstract: Hydrogen carriers, such as dimethyl ether (DME), offer a promising path toward carbon-neutral power generation and the development of a hydrogen-based energy economy. DME has the potential to address the uneven regional and temporal distribution of renewable energy by enabling long-distance energy transfer. Furthermore, its favorable combustion characteristics and compatibility with existing infrastructure position DME as an attractive renewable fuel.This study aims to comprehensively compare the performance of DME as a fuel in advanced oxy combustion supercritical CO2 (sCO2) cycles, such as the Allam cycle, and in state-of-the-art combined cycle gas turbines with post-combustion carbon capture (CCGT-PCC). In addition to the reference Allam cycle, we propose a novel modification: the Liquefied Recycle Allam Cycle (LiRAC). This modification features an integrated refrigeration unit that enables liquefaction of the working medium using DME as the refrigerant. Process simulations demonstrate that the LiRAC achieves a competitive efficiency of 48.7 %, approaching that of the DME-fueled Allam cycle (50.4 %), with both cycles achieving effective carbon capture rates above 96 %, approaching carbon neutrality. However, under consistent system boundaries, the DME-fueled CCGT-PCC achieves an efficiency of only 44.7 %. These findings demonstrate the feasibility of using DME as a fuel for semi-closed oxy-combustion sCO2 cycles and highlight its potential as a pathway toward nearly carbon-neutral power generation.
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