Abstract:

Based on Fluent software, the ethylene/air premixed flame state in four different slit duct propagation of flame arrester and the pressure drop of each slit flame arrester under normal conditions were simulated. The flame inhibition performance of four different slit in-line flame arrester was comprised and analyzed. The slit flame propagation characteristics were analyzed with round slit as a case. The simulation results show that the flame shows a "fingertip" shape during the propagation of the micro-circular slit, will be detained and then continues to travel forward along the axis of the slit, but this phenomenon does not occur in the plate slit, triangle slit and diamond slit. For the round slit, the flame resistance unit with a thickness of 100 mm cannot prevent flame. For plate slit or triangular slit, flame resistance unit with thickness of 30 mm can successfully resist flame. For the diamond-shaped slit, flame resistance unit with a thickness of 10 mm can successfully prevent flame. Under the condition of successful flame resistance and the same number of flame resistance units, the pressure loss of the plate slit is the minimum, and the pressure loss of the diamond slit is much greater than that of the triangle slit and the plate slit. 

Key words:  micro channel flame, ethylene- air, flame propagation characteristics, flame arrester