The flow characteristics of granular coal with wide size distribution from an aeration plexiglass silo were investigated.The results showed that outlet diameter of the silo

coal particle size and moisture content had significant effects on discharge characteristics of granular coal with wide size distribution from aeration silo.The discharge rate of granular coal with wide size distribution increased with increasing outlet diameter

but the increase decreased with increasing gas flow rate.Effective size of outlet diameter decreased with increasing average particle size of granular coal with wide size distribution

which resulted in decreased discharge rate.Increasing moisture content of granular coal with wide size distribution would lead to agglomeration of the fine pulverized coal.During the discharging process of high moisture content granular coal with wide size distribution

an arch could be easily formed

and discharge rate decreased.In order to ensure stable and continuous discharge of granular coal with wide size distribution in the aeration silo

there existed a limiting moisture content which was affected by particle size of granular coal

coal type and silo structure.In this system

outlet diameter of aeration silo was 35 mm

limiting moisture contents of 〖JP2〗the 0—2.50 mm

0—3.86 mm and 0—5.44 mm granular coal were 5.30%、7.50% and 7.60% respectively.