Abstract
Abstract The basic function of a refuge chamber is to maintain reasonable concentrations of O 2 , CO 2 , and CO. The supply of compressed oxygen in a refuge chamber is always limited. Therefore, it is vitally important to determine how to make the most effective use of compressed oxygen and maximize its supply time. In this paper, we determine the basic law of gas leakage in refuge chamber and reveal that the higher is the pressure in the refuge chamber, the more oxygen leakage occurs. We examine the law of supply and consumption of compressed oxygen and its interrelationship with the air cleaning system. An excessive supply of compressed oxygen only serves to increase its consumption with no positive effect on air quality. However, air cleaning systems can not only decrease the carbon dioxide concentration but also increase the oxygen concentration. Therefore, the compressed oxygen supply and air purification system must be simultaneously enabled to maintain a reasonable air concentrations in the chamber. And the oxygen supply rate should be dynamically adjusted according to human need.
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