Study on the explosion characteristics of alcohol vapor cloud-feed powder dust cloud mixture during the deep processing of waste mash

The explosion limits (LEL&UEL), maximum explosion pressure ( P max ), and minimum ignition energy (MIE) of mixtures composed of four combustible feed dusts and inflammable alcohol vapor are investigated in a modified 20-L spherical explosion system and a modified MIE test system. The explosivity of vapor-dust mixtures is tested according to national standards GB/T16425, GB/T16426 and GB/T16428, using four combustible feed dusts mixed with inflammable alcohol vapor. The results show that adding low concentration alcohol vapor can broaden the range of explosion limits for feed dusts. Alcohol vapor affects both the P max and MIE of feed dust in a unimodal pattern. There is a critical value for the increase of feed dust explosion parameters by alcohol vapor: 10 vol% alcohol vapor. Below this value, alcohol vapor increases the explosivity of feed dusts remarkably. Above this value, it reduces their explosivity. Finally, the influence of low concentration and high concentration alcohol vapor on feed dusts is examined from the ignition process of alcohol vapor-feed dust mixture. According to the experimental data, we also optimized the explosion discharge area of the auxiliary dust collector of the waste mash drying system. The research conclusion provides a technical means for the safety issues of gas-solid mixed dust removal systems.