At present, the main prospects for improving the insulating means of respiratory protection are related to the chemical method of oxygen reservation. The arguments in favor of this choice are the high density of oxygen packaging and its self-regulating supply, depending on the physical activity of the person.
Usually, the working process in devices on chemically bound oxygen is modeled using mathematical physics methods that solve the so-called sorption dynamics problem. As a result, under given boundary and initial conditions, the concentration of CO2 molecules in the regenerative cartridge turns out to be a deterministic function of time and coordinates. However, the coordinate of the elementary act of sorption is essentially a random variable. The law of its distribution evolves as the absorbing resource of the regenerative cartridge is consumed. Taking into account the above, a probability-theoretic approach to modeling the working process of an insulating breathing apparatus based on chemically bound oxygen was developed. The approach is based on the description by probability theory methods of the random coordinate of the elementary act of chemosorption of a CO2 molecule by potassium peroxide granules and the random lifetime of this molecule in the regenerative cartridge of the respiratory apparatus. The evolution of the initial and central statistical moments of these values is established. The symmetry of their probability density with respect to the permutation of dimensionless arguments is shown, which are the time and distance from the entrance to the regenerative cartridge to the considered layer of chemisorbent. The presence of symmetry increases the speed of numerical experiments by one or two orders of magnitude. Gaussian asymptotics of the process at long times and corrections to it by inverse degrees of dispersion due to asymmetries and excesses of different orders are revealed. This further increases the speed of numerical experiments in computer simulation of the working process of an insulating respirator on chemically bound oxygen.
2. Gudkov S.V., Matveykin V.G., Shapovalov G.G. Advantage of Using Isolating Self-Rescuers with Chemically Fixed Oxygen in the Coal Mines. Bezopasnost truda v promyshlennosti = Occupational Safety in Industry. 2012. № 11. pp. 40–44. (In Russ.).
3. BS EN 13794:2002. Respiratory protective devices. Self-contained closed-circuit breathing apparatus for escape. Requirements, testing, marking. Available at: https://shop.bsigroup.com/ProductDetail/?pid=000000000019972741 (accessed: May 20, 2020).
4. Jolson J. Underground Self-Rescuer Technology, Past, Present, and Future. 3rd SCSR Workshop at the MSHA Training Academy. Arlington, 2006.
5. Kawano M., Watarai H. Patent № 2741079 EP, G01N 27/74. PCT/JP 2012/069697. Porosity Measurement Apparatus and Porosity Measurement Method. Applied: August 2, 2012. Published: June 11, 2014. Bulletin № 24.
6. Maystrenko A.V., Maystrenko N.V., Erokhin O.I. Simulation of self-contained breathing apparatus on chemically bound oxygen. Nauchnye vedomosti Belgorodskogo gosudarstvennogo universiteta. Nauchnye vedomosti Belgorodskogo gosudarstvennogo universiteta. Istoriya. Politologiya. Ekonomika. Informatika = Research Bulletin of Belgorod State University. History. Political Science. Economics. Information Technologies. 2014. № 1 (172). Iss. 29/1. pp. 81–87. (In Russ.).
7. Ekhilevskiy S.G., Golubeva O.V., Potapenko E.P. Simulation of the working process of the breathing apparatus on chemically bound oxygen after changing the mode of its operation. Izvestiya vysshikh uchebnykh zavedeniy. Gornyy zhurnal = News of the Higher Institutions. Mining Journal. 2015. № 1. pp. 35–41. (In Russ.).
8. Balabanov P.V., Krimshteyn A.A., Ponomarev S.V. Identification of the parameters of air regeneration mathematical models by means of insulating type protection. Vestnik Voronezhskogo gosudarstvennogo tekhnicheskogo universiteta = Bulletin of Voronezh State Technical University. 2010. Vol. 6. № 7. pp. 68–73. (In Russ.).
9. Ekhilevskiy S.G., Olshanikov S.A., Potapenko E.P. Influence of variable boundary conditions on the quasi-stationary profile of CO2 concentration in the regenerative cartridge of a mine respirator. Izvestiya vysshikh uchebnykh zavedeniy. Gornyy zhurnal = News of the Higher Institutions. Mining Journal. 2013. № 3. pp. 46–53. (In Russ.).
10. Didenko N.S. Regenerative respirators for mining and rescue operations. Moscow: Nedra, 1990. 160 p. (In Russ.).
11. Ekhilevskiy S.G. Increasing the resource efficiency of breathing apparatus on chemically bound oxygen: abstract of the thesis... Doctor of Technical Sciences. Dnepropetrovsk, 2002. 35 p. (In Russ.).
12. Pytev Yu.P., Shishmarev I.A. The course of probability theory and mathematical statistics for physicists: textbook. Moscow: Izd-vo Moskovskogo universiteta, 1983. 256 p. (In Russ.).
13. Ekhilevskiy S.G. Optimization of Chemically Bound Oxygen Respirator. Bezopasnost truda v promyshlennosti = Occupational Safety in Industry. 2019. № 8. pp. 85–91. (In Russ.).
