Patent ID: 6089023
Filing Date: 2000-07-18
Classification: F22D,F23J,F23L,Y02E

Abstract:
A method of operating a steam generating system including a steam generator which generates a flue gas stream, an air preheater which transfers heat from said flue gas stream to an incoming air stream to produce a heated air stream, and a particulate control device for removing particulates from said flue gas stream, said method comprising the steps of:a. passing a quantity of air through said air preheater wherein said air is heated, said quantity of air being selected to provide a desired flue gas temperature for operation of said particulate control device and including a first portion comprising combustion air and a second portion comprising excess air;b. withdrawing said quantity of heated air from said air preheater;c. passing said first portion of heated air to said steam generator as combustion air; andd. passing said second portion of heated air around said steam generator as excess air and discharging said excess air to the atmosphere.