Patent ID: 6412446
Filing Date: 2002-07-02
Classification: F23G,F23L

Abstract:
A method of firing in a boiler, comprising:introducing loosely stacked fuel (6) through a charging opening (5) into a furnace (1) of the boiler on a first support (7); directing jets (25) of ignition air entraining hot flue gas from the furnace at a top surface of the loosely stacked fuel on the first support so that the top surface of the loosely stacked fuel is ignited and the fuel is partially gasified; passing the air from the ignition air jets (25), together with the entrained flue gas, down through the loosely stacked fuel (6) and the first support (7) and to the furnace (1); and passing the fuel onto a grate (9) located at a lower level on which the final combustion of the fuel takes place, wherein the flue gas entrained by the ignition air jets (25) is drawn substantially from a section of the furnace through which flows a mixture of combustion products from the first support and the grate (9).