Stoker Coal Firing. On bottom ash handling systems, motor driven clinker
crushers shall be installed below the hopper outlets and above the pneumatic ash
Pulverized Coal Firing. For pulverized coal firing, each bottom ash hopper
discharge gate is provided with a clinker crusher. In order to avoid clinker crusher
plugging problems, pulverizer pyrites rejects should be discharged to a separate holding
tank and not to the bottom ash hopper.
Ash Storage. Silos are used for storage of pneumatically conveyed bottom ash
and fly ash. The use of silos facilitates the disposal of ash by truck or rail cars.
Minimum silo storage capacity should be 72 hours based on maximum ash production rate.
Motor driven rotary dustless unloaders (conditioners) shall be used to unload the silo
into trucks or railroad cars. For additional requirements, see MIL-HDBK-1003/6.