AshTech Corporation - Design Features of Mechanical Ash Handling Systems

CONVEYOR CHAIN is selected to provide maximum strength while possessing superior abrasion-resistant characteristics. Heat-treated round link chain possesses maximum tensile and lateral strength and shock load resistance. Wear-resistant characteristics provide low wear rates while maintaining constant strength levels. Custom chain designs available for special high temperature and corrosive environments.
	HEAVY-DUTY CONVEYOR FLIGHTS are attached to the chain with connector links, forming easily replaceable, modular assemblies. Flight height and width are selected based on ash properties, conveyor speed, and angle of inclination. Special flight designs feature reinforced heavy load capacity, high abrasion resistance, and low adhesion polymer materials for special conveying applications.
REPLACEABLE WEAR PLATES are designed for extended life and ease of replacement. All conveyor surfaces in contact with abrasive material are lined with abrasion-resistant plates which also support the flights. Wear plate hardness, thickness, and materials are selected to suit ash characteristics and maximize life. Plates are removed and replaced in modular fashion with minimized field labor.
	LOW-SPEED HIGH-TORQUE DRIVES are sized for maximum conveying requirements and heavy shock loading. Mechanical overload protection and reversing capabilities are standard. Optional mechanical variable speed drives permit precise matching of conveyor speed to actual ash rates. This flexibility results in lower wear rates and the ability to meet surge requirements.
CONVEYOR HEAD SPROCKETS and idler pulleys are hardened for extended life and mounted on high strength shafting, supported by external-mounted roller bearings. Only rolling contact occurs with the chain, extending the wear life of all components. Special split sprocket and replaceable tooth segment designs are available to facilitate maintenance.
	HEAVY-DUTY TROUGHS on submerged bottom ash conveyors are constructed of heavy wall plate with external stiffeners to withstand impact and shock from slag and clinker falls. Protector skirts inside the conveyor shield the chain from impact and prevent material from entering conveyor pulleys and drive sprockets, minimizing wear and maximizing conveyor reliability.
EXTERNAL-MOUNTED ROLLER BEARINGS support conveyor head sprockets and transition idler pulleys. Dust seat housings and water purge seal systems protect bearings from dust or water invasion and maintain conveyor seal integrity. All seals and bearings are accessible from the exterior for ease of service.
	DUST-TIGHT CONSTRUCTION on dry conveyors is maintained with flanged and gasketed access doors and cam-action latches. Troughs are reinforced, heavy wall, welded construction with bolted, gasketed mating flanges and lids. Dust-tight shaft seals and take-up design permit direct bolting of conveyors to dust hopper outlets, minimizing seal valve requirements.
CHAIN TAKE-UP ASSEMBLIES provide spring-loaded manual or cylinder-operated automatic tensioning of chain slack during conveyor operation. On enclosed conveyors, dust-tight shaft seal housings and sliding seal plates work in unison to maintain air-tight, dust-tight seal as the take-up moves over its full travel length.