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Methods for obtaining oxygen for life support in hermetically isolated objects

UDC 661.937.6

Methods for obtaining oxygen for life support in hermetically isolated objects

Pronin V.A., Kalashnikova Elena A., Tsvetkov V.A., Kovanov Aleksandr V., Dolgovskaya O.V.

For citation: Pronin V.A., Kalashnikova E.A., Tsvetkov V.A., Kovanov A.V., Dolgovskaia O.V. Methods for obtaining oxygen for life support in hermetically isolated objects. Journal of International Academy of Refrigeration. 2022. No 3. p. 13-20. DOI: 10.17586/1606-4313-2022-21-3-13-20

Abstract
It is necessary to use special closed apparatus in the study of outer space or the depths of water objects. These technologies have a limited supply of oxygen, which can be obtained with various methods. Therefore, methods for obtaining oxygen for hermetically isolated objects are considered in this paper. The purpose of the article is the efficiency of oxygen generation processes’ increase depending on various methods of oxygen production at different operating parameters of the regeneration system. An analysis of various methods of obtaining oxygen in air regeneration systems and a comparative assessment of the possibility of their use for closed systems are given. The production of oxygen from calcium peroxide was chosen as the most economical and environmentally friendly method in the comparison. Calcium peroxide is a sought-after substance due to its property to retain active oxygen while in a solid state. One kilogram of calcium peroxide theoretically contains 156 liters of active oxygen. Experimentally, oxygen was extracted by two chemical methods: by decomposing an aqueous suspension of calcium peroxide and by using high-temperature calcination.

Keywords: oxygen, oxygen production, isolated objects, air regeneration, calcium peroxide.

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