Abstract: In order to study the law of gas explosion pressure near the gas explosion limit in two gas states,the 20 L explosion characteristic test system is used to record and map the gas explosion pressure changes under different gas concentrations,so as to intuitively analyze the gas explosion pressure law and determine the gas.Explosion limit range.The study obtained the gas concentration range of the upper and lower limits of gas explosion under two gas states,and determined the gas explosion limit.At the same time,it is also found that the general trend of gas explosion pressure with little difference in concentration is that the gas explosion pressure increases slowly with time after ignition in the static state,and the gas explosion pressure increases rapidly after ignition in the turbulent state.

Key words: Gas explosion, Explosion limit, Gas concentration, Gas pressure