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Alstom's Stoker Grate Drive System is a variable speed electro-mechanical drive that utilizes high-efficiency planetary gearing to deliver high torque/low speed rotational energy to the stoker drive shaft.

Features

• Flexible design enables the drive to meet the requirements of nearly all traveling grate brands and models
• Variable speed allows for automatic operation with plant control system
• Continuous drive shaft torque monitoring provides real-time data related to grate reaction loads and potential trouble
• Electronic overload protection provides safety shut-off of drive unit in grate overload situation
• Tachometer provides continuous grate speed indication as well as "Zero-Speed" alert if the motor is tripped
• Drive systems available with standard equipment package
• NEMA rated local control panel houses all necessary controls for the drive to function as a stand alone unit as well as interface terminations for complete control from and feedback to the boiler control system
• The control panel is shop wired, programmed, and test run with the drive prior to shipment
• Tachometer and torque displays show grate speed in ft/hr and grate torque in ft-lbs
• The above instruments provide programmable zero-speed and over-torque settings for local alarm indication and analog (4-20 mA) signals and feedback to the boiler control system
• Blower-cooled motor also cools the initital gearbox reduction
• Customer-specific equipment changes can be provided

Benefits

• Loading on drive shaft and drive-end bearings are reduced with Alstom's shaft-mounted, floor-supported design
• Installation time is reduced with the shaft-mounted design
• Preventive maintenance can be improved with analysis of drive speed and torque data
• Operators are alerted that the grate drive has stopped via the "Zero-Speed" indicator
• Unforeseen emergency grate maintenance and boiler downtime is reduced via continuous torque monitoring (CTM) that provides critical information to operators much earlier than visual inspection
• Tracking ad trending of grate wear for improved predictive maintenance can be accomplished by transmitting the data collected by CTM to the plant;s DCS (distributed control system)

Increasing Your Competitive Edge

The Stoker Grate Drive System is another example of the Alstom commitment to provide products and services to improve performance and reduce maintenance, thereby increasing your competitive edge.