STUDY OF LEAKAGE AND EXPLOSION HAZARD CHARACTERISTICS OF A COMPRESSED NATURAL GAS AT A GAS STATION

This paper presents the results for a model of a typical urban compressed natural gas (CNG) station obtained with the help of numerical methods on the assumption that the leakage explosion scenarios run under three orifice sizes. The simulation demonstrates that the CNG leak rate is quite high and the leaking gas cloud spreads quickly along the ground, increasing the vertical diffusion speed. As a result, longitudinal space becomes the main area of hazard. The hazard explosion overpressure is concentrated mainly in the narrow area between the tank and surrounding buildings, and the maximum explosion overpressure exceeds 0.4 bar. The range of the overpressure hazard will cover the entire gas station where a shock wave, high temperature, and flame damage may occur, but projectile strikes may exceed this range, and the risk of explosion becomes higher. In addition, the attenuation of the overpressure by the wall is significant, and the maximum attenuation rate can reach 65%.
  Автор:  W. Li, X. Shen, Z. Huang, T. Mao, Q. Hu , and C. Ma
Ключевые слова:  compressed natural gas, filling station, leakage, vapor cloud explosion, hazard
Стр:  395