Analysis on influence dimension of jet flame hazard in natural gas pipeline

Objective In order to study the influence range of different dimensions of jet flame, the gas leakage model was used. Based on the basic principles of fluid mechanics, a three-dimensional pipeline model was established by FDS software to simulate the flame conditions of different directions and dimensions of the leakage jet.

Methods By introducing the leakage angle into the calculation of the hazard radius, the assessment model of the hazard range of jet flame was improved, and a new calculation model of the hazard range of jet flame with different leakage angles was established. The calculated values of the model were compared with the numerical simulation values.

Results For the geometric characteristics of flame, thermal radiation value and temperature distribution, the jet flame in 0 ° and 30 ° directions is quite different from that in 90 ° direction. Obviously, the harm range of jet flame in 90 ° direction is smaller.

Conclusions The improved hazard range prediction model is in good agreement with the simulation results. Compared with the traditional theoretical model, it is more accurate and comprehensive to calculate the fire hazard range of each angle jet.