Suppression characteristics of KHCO3/red-mud composite powders with core-shell structure on methane explosion
WANG Yan
CHENG Yi-shen
CAO Jian-liang
ZHENG Li-gang
YI Hong-wei
YU Ming-gao
Abstract：The KHCO3/red-mud composite powder was successfully prepared by the anti-solvent method for gas explo sion suppression.The aluminum industry solid waste red mud was used as the support,and the traditional suppressant KHCO3 was used as the active species.The as-prepared samples were analysized by the techniques of XRD,TG-DSC,SEM,TEM.The analysis results indicated that the composite powder possesses the special core-shell structure,which has an impact on inhibitory property.The suppression property of the as-prepared sample for CH4 explosion was tested by a 20 L spherical explosion experimental system.The results show that the potassium bicarbonate/red mud composite powder has better suppression property than that of pure red mud or pure potassium bicarbonate.The explosion pressure of 9.5％ methane-air premixed gases was reduced by 37.5％ with 30％ loaded content.The maximum value of pressure rising rate was reduced by 93.2％,and the sensitive period of the explosion was extended from 25 to 250 ms.The explosion suppression mechanism of this potassium bicarbonate/red-mud composite powder was also investigated.
Keywords：red mudcomposite powderscore-shell structuremethane explosion suppression
Publication Date：2017-01-01
Pages：6( 653-658 )