Abstract: In order to study the effectiveness of ultra fine water mist containing tea polyphenol additive on inhibiting methane explosion, self—made acrylic semi—closed pipe was used for explosion suppression experiment, and the influence of tea polyphenol additive concentration on flame propagation speed, explosion overpressure and other parameters was studied. The results showed that for methane with volume fraction of 9.5%, when the mass fraction of tea polyphenol additive was 10.0%, the explosion suppression performance was the most significant, and the flame propagation velocity and maximum explosion overpressure decreased by 34.86% and 59.41%, respectively, compared with that of pure methane under free explosion. Compared with pure water ultrafine water mist, it decreased by 21.56% and 41.01%, respectively. Through the chemical action of the consumption of free radicals such as H and O by the phenol hydroxyl group and the physical action of endothermic inerting, tea polyphenols can jointly inhibit the chain reaction of methane explosion, thus effectively inhibiting the methane explosion. It can be seen that tea polyphenol as a fine water mist additive has a good inhibition effect on methane explosion.

Key words: tea polyphenols, ultrafine water mist, methane explosion, explosion suppression mechanism, explosion overpressure, flame propagation speed