Vacuum pneumatic ash collection & ash conveying system
Ash which has accumulated in various collection hoppers is pneumatically conveyed to a centrifugal receiver atop the ash storage silo. Vacuum forces providing the conveyance air flow are created by a blower (exhauster) located near the silo.
Coarser ash particulates collecting at the bottom of the receiver are transferred to the silo via a double dump gate air lock assembly ( see description on following page). Finer ash particles and the induced conveying air flow report through the "vortex finder" pipe at the top of the centrifugal receiver to a pulse jet, bag type dust collector located nearby. Ash particulates released by periodic blow down of the bags collect below, where this material is transferred to the silo via a double dump gate air lock assembly. Overall solids recovery typically exceeds 99.9% for 2 micron and larger particulates.