By the study of Flame Propagation Theory and Flame Stability Theory, backfire and yellow flame can be avoided by regulating the speed of flame propagation and exit velocity of mixture current at orifice.

• 通过对火焰传播理论和火焰稳定性理论的研究，综合调节火焰传播速度和火孔处混合气体的气流出口速度，不仅能保证煤制气燃烧时不回火而且燃烧完全，使黄火少甚至可以没有黄火。