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Experimental study on the safety of helium and hydrogen mixtures.

Author(s) : SUN A. G., SHEN Y. N., CHEN B., et al.

Summary

Compared with pure helium, hydrogen and helium mixtures in proper proportions can improve the performance of pulse-tube refrigerators in the temperature range from 20 to 40 K. Because hydrogen is flammable and explosive, the safety of the system cannot be ensured once the hydrogen and helium mixtures inside leak out. It is necessary to study the safety of hydrogen and helium mixtures. The paper presents the explosion limits of helium and hydrogen mixtures in different proportions via the explosive test. The results show that helium can restrain the flammability of hydrogen well. When the mole fraction of hydrogen is less than 40%, the explosive range reduces sharply. In particular when the mole proportion of helium to hydrogen is greater than 10, the gas mixture doesn't explode, irrespective of the proportion between hydrogen-helium mixture and air. But when the mole fraction of hydrogen is higher than 40%, the hydrogen and helium mixtures still have a larger explosive range.

Details

  • Original title: Experimental study on the safety of helium and hydrogen mixtures.
  • Record ID : 2006-1591
  • Languages: English
  • Source: Cryogenics and refrigeration. Proceedings of ICCR 2003.
  • Publication date: 2003/04/22

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