Dual Pressure Level Methanation of Co‐SOEC Syngas

Krammer, Andreas; Medved, Ana Roza; Peham, Martin; Wolf-Zoellner, Philipp; Salbrechter, Katrin; Lehner, Markus

doi:10.1002/ente.202000746

Cited by 4 publications

(3 citation statements)

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“…The methanation subsystem is considered as a two-stage and dual pressure level methanation process. This configuration was investigated by Krammer et al (2021) with relation to integration with co-electrolysis as part of the HydroMetha project. Their analyses revealed that a two-stage process with intermediate compression to up to 10 bar resulted in the highest methane concentrations in the product gas.…”

Section: System Boundary and Process Definitionmentioning

confidence: 99%

“…For the calculations herein, a product gas composition with a methane content of 89.0% and a hydrogen content of 9.5% was assumed, resulting in an LHV of the product gas of 9.13 kWh/m 3 . Although a hydrogen content of >4 vol% does not allow for a direct feed-in to Austrian public gas grids without further processing, the product gas is presumed to be suitable for industrial combustion processes as a natural gas substitute (Krammer et al, 2021). The substitution of conventional fuels is considered equivalent to the LHV.…”

Section: System Boundary and Process Definitionmentioning

confidence: 99%

“…The resulting gross reaction equations for an appropriate combination of co-electrolysis and CO methanation are provided in Equations (1 and 2) according to a previous study (Krammer et al, 2021). With thermal integration, an overall thermal efficiency of 83% LHV could be achieved for the power-tomethane process.…”

Section: Introductionmentioning

confidence: 99%

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Techno-Economic Assessment of Thermally Integrated Co-Electrolysis and Methanation for Industrial Closed Carbon Cycles

2021

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Energy-intensive industries still produce high amounts of non-renewable CO2 emissions. These emissions cannot easily be fully omitted in the short- and mid-term by electrification or switching to renewable energy carriers, as they either are of inevitable origin (e.g., mineral carbon in cement production) or require a long-term transition of well-established process chains (e.g., metal ore reduction). Therefore, carbon capture and utilization (CCU) has been widely discussed as an option to reduce net CO2 emissions. In this context, the production of synthetic natural gas (SNG) through power-to-methane (PtM) process is expected to possess considerable value in future energy systems. Considering current low-temperature electrolysis technologies that exhibit electric efficiencies of 60–70%el, LHV and methanation with a caloric efficiency of 82.5%LHV, the conventional PtM route is inefficient. However, overall efficiencies of >80%el, LHV could be achieved using co-electrolysis of steam and CO2 in combination with thermal integration of waste heat from methanation. The present study investigates the techno-economic performance of such a thermally integrated system in the context of different application scenarios that allow for the establishment of a closed carbon cycle. Considering potential technological learning and scaling effects, the assessments reveal that compared to that of decoupled low-temperature systems, SNG generation cost of <10 c€/kWh could be achieved. Additional benefits arise from the direct utilization of by-products oxygen in the investigated processes. With the ability to integrate renewable electricity sources such as wind or solar power in addition to grid supply, the system can also provide grid balancing services while minimizing operational costs. Therefore, the implementation of highly-efficient power-to-gas systems for CCU applications is identified as a valuable option to reduce net carbon emissions for hard-to-abate sectors. However, for mid-term economic viability over fossils intensifying of regulatory measures (e.g., CO2 prices) and the intense use of synergies is considered mandatory.

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Section: System Boundary and Process Definitionmentioning

confidence: 99%

Section: System Boundary and Process Definitionmentioning

confidence: 99%