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Suppression of the HFO-1123 disproportionation reaction by adding R290.

Author(s) : ZHANG Z., MIYOSHI A., DANG C., CHEN Y., HIHARA E.

Type of article: IJR article

Summary

Trifluoroethylene (HFO-1123) is a promising next-generation refrigerant candidate for refrigeration and air-conditioning applications owing to its low global warming potential (GWP) of less than one and zero ozone depletion potential. However, HFO-1123 may undergo a thermal decomposition reaction under high-temperature and high-pressure conditions. The refrigerant compressor is heated when glitches occur. Pressure and temperature inside the compressor are assumed to be approximately 6.0 MPa and 150 °C, respectively, in the worst practical situation. Subsequently, energy is input by short circuits between the enameled windings of the motor in the compressor. Consequently, a thermal decomposition reaction called disproportionation reaction propagates in the compressor, potentially causing the compressor to explode. From a safety perspective, it is mandatory to suppress this reaction under practical use. A previous study evaluated the suppression effect of inhibitors such as R32 and R13I1; herein, we explored an optimized inhibitor composition that simultaneously fulfills the requirements of excellent suppression of the disproportionation reaction under the worst practical condition and low GWP. R290 was selected as a new inhibitor owing to its extremely small thermal decomposition energy. Subsequently, suppression of the disproportionation reaction was investigated using mixtures of R290 and HFO-1123. The results revealed that the disproportionation reaction was suppressed at a critical concentration of R290. The suppression effect of R290 was confirmed by validation experiments using actual compressors.

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Pages: 299-307

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Details

  • Original title: Suppression of the HFO-1123 disproportionation reaction by adding R290.
  • Record ID : 30031627
  • Languages: English
  • Subject: HFCs alternatives
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 149
  • Publication date: 2023/05
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2022.12.012

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