Boiler Implosion Control in Fossil Fuel Power Plants

A computer simulation using the modeling techniques outlined in a companion paper has been used to characterize and evaluate the control systems for furnace and stack implosion problems in fossil fuel power plants. The model simulations have shown that the draft control systems reduce the furnace pressure excursion significantly following a main fuel trip condition. The limitations of these systems are associated with actuator speed and stack pressure excursions during control actions. Preliminary study suggests that a novel additional or alternative solution may be furnished through discharging steam into the furnace and/or stack after a fuel trip.