Research on the synergy effect of water mist containing additives and flame-retardant system on the syngas explosion inhibition

Abstract

This paper aimed to study on the synergy of flame-retardant system and mist containing different additives on syngas explosion. By changing the additive condition (its type and mass fraction) and spray condition, the inhibition regular and mechanism of synergy on explosion parameter were revealed. Result indicates that the inhibition effect of mist could be greatly improved after adding additive and the explosion parameter was also visibly reduced. Especially for the impact on the upper end of flame-retardant system. And the intensity order was CTAC>SDS>Tween-20 > Pure miss. As tsp = 400 ms and ω = 0.2 %, the mist containing TWEEN-20 and SDS could greatly reduce (dP/dt)max of upper end, resulting in the decrease extents of 27.6 % and 46.3 %, respectively. After adding CTAC additive, the mist could successfully prevent the propagation of flame. Meanwhile, (dP/dt)max of upper end was decreased by 87.22 % compared with the pure water mist. The inhibition effect was related to additive type and was obviously affected by its mass fraction. Within the range of 0.1 %≤ω ≤ 0.5 % mass fraction, the inhibition effects of three additives all presented a change regular of first reducing then tending to flatten out as the mass fraction increased. Differently, the mass fractions of Tween-20 and SDS additives reaching the optimal inhibition effect were 0.3 % and 0.4 %. But the optimal inhibition effect was 0.2 % for CTAC additive. The explosion parameter was gradually reduced as spray amount increased. And the complete inhibition of explosion could be achieved after adding additive. And the synergy was mainly attributed to the combination of physical and chemical effects and was affect by additive condition.