Application of a liquid nitrogen direct jet system to the extinguishment of oil pool fires in open space

Authors

  • Bobo Shi,

    1. Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou, People's Republic of China
    2. School of Safety Engineering, China University of Mining & Technology, Xuzhou, People's Republic of China
    Search for more papers by this author
  • Fubao Zhou

    Corresponding author
    1. Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou, People's Republic of China
    2. School of Safety Engineering, China University of Mining & Technology, Xuzhou, People's Republic of China
    Search for more papers by this author

  • This work was supported by National Natural Science Funds for Distinguished Young Scholars of China; (51325403).

  • This work was supported by Program for Changjiang Scholars and Innovative Research Team in University; (IRT13098).

  • This work was supported by Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions.

Abstract

Liquid fuel fires occurring during industrial processes are serious safety concerns around the world due to their devastating impact on lives, the environment and property. In this study, a liquid nitrogen delivery system was set up to extinguish the oil pool fires in open space. Effects of liquid nitrogen flow rate, pipe diameter, and liquid nitrogen release distance on the suppression process were analyzed according to the mass loss, burning rate and temperature variations. When liquid nitrogen release distance was 0.50 m and pipe diameter was 0.04 m, fire extinguishing time was the shortest 1.6 s and the temperature decrease rate above the liquid fuel surface reached 275°C/s. Fuel surface cooling and blow off process were revealed through the experiments as two kinds of fire extinguishing mechanisms. Based on the flame images captured by high speed camera, the flame expansion phenomenon might occur early in liquid nitrogen injection, especially the situation of the higher flow rate of liquid nitrogen. Three approaches (ground fixed system, moving transportation, and directional transportation of liquid nitrogen) are provided for fire extinguishment of large scale fires. The results obtained provide important reference for the conduct of fire extinguishment for fires. © 2016 American Institute of Chemical Engineers Process Saf Prog 36: 165–177, 2017

Ancillary