AshTech Corporation - Bottom Ash Submerged Chain Conveyor Systems

SYSTEM OPERATION

Bottom ash continually falls from the furnace throat, through the insulated bottom ash chute, and into the water-filled submerged conveyor trough. Cooled ash is conveyed along the bottom of this trough by conveyor flights attached at both ends to continuous loops of conveyor chain. As the ash-laden flights leave the water-filled trough and travel up the dry incline, the ash drains and dewaters itself. The dewatered ash is discharged to a takeaway conveyor or storage area. The conveyor flights return in a lower compartment which is open for maintenance.

SYSTEM FEATURES AND BENEFITS

Low-speed operation (8fpm or less) results in very low wear rates.

Continuous, unattended operation with low power consumption.

Low water use with zero water discharge systems available.

On-line access and maintenance of all critical components.

Completely shop assembled and tested for low erection costs - simple retrofits.

Variable speed operation and surge capacity for upset conditions.

Stoker/grate furnaces burning coal, wood, bio-mass, municipal solid waste, refuse derived fuel, tires, sludge, and combinations of these fuels.

Fluidized boiler bed ash removal systems.

Pulverized coal-fired furnaces from under 4OMW to over 40OMW in size, collecting bottom ash, slag, mill rejects, and economizer ash. Ash is sized or crushed, and transported to storage bunker or silo for truck loading.