Study on liquefied natural gas safety dispersion distance

The dimensionless principle is employed to analysis the factors which influence the dispersion of liquefied nature gas (LNG). Dimensionless distance is taken as Y-coordinate and Richardson number as X-coordinate to get power regression equations of trial data. The author finds that: (1) data distribution is uniform when the gas concentration attains 5% because dispersion distance is determined mainly by the turbulence produced by LNG initial momentum at the earlier stage. (2) After the gravity spreading stage is over, natural gas changed into stratified flow, the vertical dispersion is impressed greatly. Correlation coefficient decreased between dimensionless distance and transformed Richardson number. (3) In the process when concentration is decreasing to 1%, the vertical heat convection turbulence is strengthened, so the dimensionless distance is influenced by some other factor besides Richardson number. The distances at which the LNG volume concentration are 5%, 2.5%, 1% can be computed respectively using the power regression equations at different wind and LNG released velocities.