Investigation　of　Lower　Explosive　Dust　Concentration　Under　Lower　Humid　Conditions

Abstract

It　isεIPPreciated　that　a　dust　explosion　potential　is　dependent　on　physical　and　chemical　properties，including　chemical characteristics，surface　conditions，particle　sizeεLnd　moisture　content． Several　studies　were　carried　out　under　bQth　usual　and　lower　humid　cQnditions　in　an　effort　to　determine　a　explQsive　dust concen廿ation　limit　affected　by　humidity． Lower　humid　condition　experiments　indicated　that　a　dust　explosion　could　occur　at10mg／」10wer　dust　concentration than　that　under　the　usual　co血dition． The　Lycopodium　experiments　using　the　cylindricical　explosive　contailler，which　is　accepted　by　A＄sociation　of　Powder Process　Industry＆Engineering　Standard，also　showed　the　same　results．