Study on Safe Direct Combustion Technology of Low-concentration Gas

Many technical problems exist in the direct utilization of the low－concentration or especially the explosionconcentration gas extracted from the coal mine，and if such gas is discharged into the atmosphere directly，the safety risk also exist．Through the mechanism research，experiemental study，design and field test on the fire resistance and explosin suppression of the metal fiber burner and flame arrester，it proved that under the reasonable design parameters，the metal fiber burner can resist the fire and insulate the heat effectively，and the gas explosion can be transformed into safe combustion．The metal fiber flame arrester can resist the fire and explosion effectively in the pipeline and cut off the propogation of gas explosion in it．On this basis，a low－concentration gas safety combustion system with the handling capacity of 2 000 m³/h and the methane volume fraction of 10%was developed．Though safety analysis and industrial test，it proved that the system was safe and reliable，and could meet the requirement of low－concentration gas treatment in the coal mine，this thus provided a new technical way for the safe discharge of the gas within the explosion－concentration range，the gas emission reduction and gas utilization．