Patent ID: 6244200
Filing Date: 2001-06-12
Classification: F23C,F23K

Abstract:
A method for low-NO.sub.x combustion of a pulverized solid fuel comprising the steps of:burning an auxiliary fuel under fuel-rich conditions, producing at least one stream of combustion products;mixing a mixture of pulverized solid fuel and a gaseous carrier fluid with said combustion products, forming a mixture of said pulverized solid fuel, said gaseous carrier fluid, and said combustion products;heating said pulverized solid fuel and said gaseous carrier fluid by mixing with combustion products in a preheater, resulting in preheated pulverized solid fuel and devolatilization of at least a portion of said pulverized solid fuel and formation of devolatilization products; andburning said preheated pulverized solid fuel and said devolatilization products in a combustor comprising a burner firing directly into a combustion chamber, resulting in formation of a primary combustion zone within said combustor.