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Industrial sectors release significant amounts of unused waste heat below 150 °C, which matches the temperature range for heating and hot water needs. Thermochemical energy storage (TCES) has the advantage of long-term storage and heat transportation, and K₂CO₃ is a candidate of thermochemical energy storage material, because of its excellent safety and stability. However, K₂CO₃ has the disadvantage of low reaction kinetics. In this research, composite particles were synthesized by mixing 97 wt.% K₂CO₃ and 3 wt.% expanded graphite (EG) with ethanol and water to improve its reaction kinetics. The results showed that the composite K₂CO₃ with EG exhibited improvements in both reaction kinetics and thermal conductivity. LiCl-1% exhibited the highest hydration reaction rate of 5.71 × 10−3 min−1, greatly surpassing that of pure K₂CO₃ (0.243 × 10−3 min−1). Moreover, the thermal conductivity increased by a factor of 1.39 to 1.52. In addition, the dehydration onset temperature decreased by over 7 °C enabling heat storage from lower-temperature heat sources and thereby enhancing the performance of the material as a low-temperature regenerated TCES material.

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Enhancing the Reaction Kinetics of K2CO3 for Low-Temperature Thermochemical Energy Storage

  • 会议论文

  • 发表日期：

    2025年

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  • Hongzhi Liu,
  • Miyuki Arai,
  • Katsunori Nagano

摘要

Industrial sectors release significant amounts of unused waste heat below 150 °C, which matches the temperature range for heating and hot water needs. Thermochemical energy storage (TCES) has the advantage of long-term storage and heat transportation, and K₂CO₃ is a candidate of thermochemical energy storage material, because of its excellent safety and stability. However, K₂CO₃ has the disadvantage of low reaction kinetics. In this research, composite particles were synthesized by mixing 97 wt.% K₂CO₃ and 3 wt.% expanded graphite (EG) with ethanol and water to improve its reaction kinetics. The results showed that the composite K₂CO₃ with EG exhibited improvements in both reaction kinetics and thermal conductivity. LiCl-1% exhibited the highest hydration reaction rate of 5.71 × 10−3 min−1, greatly surpassing that of pure K₂CO₃ (0.243 × 10−3 min−1). Moreover, the thermal conductivity increased by a factor of 1.39 to 1.52. In addition, the dehydration onset temperature decreased by over 7 °C enabling heat storage from lower-temperature heat sources and thereby enhancing the performance of the material as a low-temperature regenerated TCES material.