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Methanol-based thermochemical energy storage (TCES) for district heating networks

Author

Listed:
  • Rodríguez-Pastor, D.A.
  • Carvajal, E.
  • Becerra, J.A.
  • Soltero, V.M.
  • Chacartegui, R.

Abstract

With increasing volatility in natural gas markets and the need for residential heat, research for alternative thermal systems based on green hydrogen-based fuels is necessary. Massive implementation of hydrogen in the current fleet presents a challenge for the decarbonisation of conventional thermal processes. This paper presents the integration of green methanol from a seasonal thermochemical energy storage system (TCES) coupled with district heating networks (DHN). It allows for a solar-based storage and low-temperature heat generation from the exothermic discharge reaction. The system uses concentrated solar thermal energy to decompose methanol into syngas at moderate temperatures (<315 °C), reducing GHG emissions from combustion to meet residential heat. Its potential is assessed through an analysis of 458 rural municipalities in Spain, achieving a substitution of 3.1 % of the natural gas demand. The system allows the production of green fuels from syngas using an open-loop approach, offering new market pathways in primary sector. In a closed-loop configuration, roundtrip efficiencies exceeding 60 % and chemical conversion efficiencies exceeding 70 % are reached, resulting in a global efficiency of 12 % for the DHN and methanol-TCES. The results show a levelized cost of stored energy highly competitive with other storage systems (<200€/MWh), given its simplicity.

Suggested Citation

  • Rodríguez-Pastor, D.A. & Carvajal, E. & Becerra, J.A. & Soltero, V.M. & Chacartegui, R., 2024. "Methanol-based thermochemical energy storage (TCES) for district heating networks," Energy, Elsevier, vol. 298(C).
    • Handle: RePEc:eee:energy:v:298:y:2024:i:c:s036054422401065x
    DOI: 10.1016/j.energy.2024.131292
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    References listed on IDEAS

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