Study on Process Time of Displacing Oil Vapor in Oil Tank with Inert Gas

Replacing oil vapor with inert gas during the process of purging oil tank has advantages of high security and high efficiency. Through the assumption and simplification of the replacement process, a differential equation for calculating the replacement time is established. After solving it, a computational formula is obtained by the means of introducing diffusion coefficient into the equation. By nonlinear fitting the three-time experimental data, the concrete values of diffusion coefficient with three-time different flow volume are worked out, and the full calculation formula between O2 volume fraction and replacement time is acquired as well. The calculation formula deduced from this paper has a high realistic reference value to the process of purging oil vapor in oil tank.