Combustion Optimization Through Air Flow and Coal Flow Balancing at Crystal River Unit 4

摘要

A recent installation of the Continuous Combustion Management system at Progress' Crystal River Power Plant in Crystal River, FL, was performed with the objective of balancing air:fuel A/F ratios at each burner by way of balancing coal distribution to all burners and secondary air distribution from compartmentalized windboxes to each burner. Progress Energy has previously installed combustion optimization/control equipment on several boilers in their system. Through efforts to reduce NOx at other Progress Energy stations, Progress Energy has developed a burner secondary air controls strategy that is flexible enough to allow for changes in load (mills in and out of service), changes in total air to the boiler and other operational changes. Crystal River 4 has compartmentalized windboxes encapsulating a single burner row and a single mill. Combustion tuning and optimization consisted of a dual-phase process. Online burner coal and air flow measurement combined with advanced control strategies have been successfully integrated on multiple units at Progress Energy to reduce carbon monoxide, NOx and LOI.