Applied Energy | VOL. 259
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Reversible solid oxide cell systems for integration with natural gas pipeline and carbon capture infrastructure for grid energy management

Publication Date Feb 1, 2020

Abstract

Abstract Electrical energy storage (EES) is necessary to enable greater penetration of renewables and as a grid-balancing solution, but current EES technologies suffer from capacity or geological limitations and high cost. Reversible solid oxide cells (ReSOCs) are an electrochemical energy conversion technology that can produce both electricity from fuel (gas-to-power) and fuel from electricity (power-to-gas), depending on resource availability and demand. Leveraging in situ C-O-H chemistry and operating at intermediate temperature (600 ° C) and elevated pressure (10 – 20 bar) enables these cells to be mildly exothermic, eliminating the need for external heat input or high over-potential (low-efficiency) operation during electrolysis mode. This operating strategy also results in higher methane production during electrolysis, facilitating easier integration with natural gas pipeline infrastructure over steam/hydrogen electrolytic processes. This study proposes a ReSOC system integrated with both natural gas pipeline and carbon capture and storage (CCS) infrastructure to render a flexible, grid energy management resource. In gas-to-power mode, the system takes natural gas from a pipeline to produce electricity. Un-utilized fuel is combusted with oxygen and expanded through a turbine to produce more power. The water in the exhaust is condensed, and the remaining carbon dioxide is compressed for tanker or pipeline transportation to a carbon sequestration site. In power-to-gas mode, carbon dioxide and water are co-electrolyzed in...

Concepts
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Reversible Solid Oxide Cells
Natural Gas Pipeline
Carbon
Electrical Energy Storage
Carbon Capture And Storage
Natural Gas
Cells
Electricity
Methane
Synthetic Natural Gas

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