Patent ID: 6136068
Filing Date: 2000-10-24
Classification: F27B,F27D

Abstract:
A method of filtering dirty air that includes emissions received from an electric arc furnace comprising the steps of:providing a compartment connected to receive dirty air;providing a filter in the compartment and having a dirty air side and a clean air side;providing a duct connected to the clean air side of the filter;providing a variable speed fan connected to move air into the compartment and through the filter to the clean air side of the filter and from the clean air side of the filter to the duct;selectively changing the speed at which the variable speed fan operates during operation of the electric arc furnace;providing a damper for selectively closing the air flow path between the filter and the duct;setting a plurality of pressure differential values across the filter for different speeds at which the fan rotates;determining the pressure differential across the filter;determining the speed at which the fan rotates;closing the damper when the values determined for the pressure differential and fan speed match the set values for pressure differential and fan speed;initiating a filter cleaning cycle.