In any firing process in a modern pulverized-coal-fired power station, accurate fuel feed is required to ensure total oxidation of all combustible elements. Changes in the bulk density of coal limit the accuracy to which fuel-to-air ratios can be held, unless compensated for by the feeder ahead of the combustion process.
During the 1950s, Stock Equipment Company successfully combined weighing and control of material flow into a single device, now known as a gravimetric feeder. Since then Stock has been busy addressing the enhancements needed in fuel feed systems and combining them with new technologies available.
From Low Pressure and Non Pressure Gravimetric Feeders for Fluidized Bed Boiler applications, to SV2424 Volumetric Feeders designed to replace outdated Rotary and Table feeders, and high temperature Knife Gate Valves for Burner line installation, continuous product improvements have revolutionized the approach on new projects. Industrial Gravimetric Feeders have been developed to support the Cement Industry. At the same time new enhancements for existing equipment have been developed to increase efficiency and improve reliability. These include Acoustic Flow Monitors to detect the presence of material in downspouts and Sampling Devices to take continuous samples of material during equipment operation.
Stock Redler Submerged De-Ashers are designed to remove ash from the
combustion chamber of solid fuel boilers without the combustion
process being influenced by leakage of air or sudden surges of ash.
Ash falls from the combustion chamber into a water trough where
it is collected and quenched. The conveyor scraper chain extracts
the wet ash from the water trough up an incline where it is dewatered.
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A Stock Redler Limited Ash Handling system is located below a Foster Wheeler
pulverised coal fired boiler that produces some 300 tonnes of steam
per hour.
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The Stock Redler ‘En Masse’ principle of conveying is
now firmly established worldwide in most industries as well
as at many power stations for the handling of pulverised fuel
ash (PFA).
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