Patent ID: 7278378
Filing Date: 2007-10-09
Classification: F23L,F28D,F28F,Y02E

Abstract:
1. A regenerative air preheater leakage recovery system comprising a coal-fired steam generator in fluid communication with at least one regenerative air preheater; said steam generator being adapted to receive a flow of heated combustion air exiting from said at least one regenerative air preheater and to discharge a flow of hot flue gas to said at least one regenerative air preheater; said at least one regenerative air preheater adapted to receive a flow of cool air in counter flow to said flow of hot flue gas and to provide a heat exchange between said cool air and said hot flue gas to convert said cool air into said heated combustion air exiting to said steam generator; said at least one regenerative air preheater leakage recovery system further comprising a first flow of heated air, routed through a source of pulverized coal to form a mixture comprising heated air and pulverized coal; said mixture being directed to said steam generator for combustion therein; and a combination of seals for effecting at least one plenum that is in fluid communication with said heated combustion air flow and said flue gas flow relative to said at least one regenerative air preheater; a fan for effecting control of said plenum to capture a leakage flow from said flow of heated combustion air and said flow of cool air; a discharge of said leakage flow to re-enter said at least one regenerative air preheater at a location substantially separate from where said flow of cool air is received in said at least one regenerative air preheater to be further heated therein and exit as said flow of heated combustion air.