초록 ▼

The invention relates to a method of igniting, upon start-up, a combustion chamber (8) in a power plant with combustion of fuel in a fluidized bed (14). The air flow through the nozzles (13) of the combustion chamber bottom (12) for fluidization of the bed (14) and for combustion of the fuel can be

The invention relates to a method of igniting, upon start-up, a combustion chamber (8) in a power plant with combustion of fuel in a fluidized bed (14). The air flow through the nozzles (13) of the combustion chamber bottom (12) for fluidization of the bed (14) and for combustion of the fuel can be reduced upon start-up; bed material, which is heated to the ignition temperature of a start-up fuel, is transferred from a storage container (40) to the combustion chamber (8), and fuel is supplied to the bed (14). In those cases where the air flow has been reduced during the transfer of the bed material, it is increased again when the fuel is supplied. The invention also relates to a power plant having means for temporarily bypassing the nozzles (13) of the combustion chamber bottom (12) while transferring hot bed material from a storage container (40) to the combustion chamber (8), and a fuel system (30-38) for the supply of fuel to the combustion chamber (8). In a plant with a combustion chamber (8) enclosed in a pressure vessel (10), a connection with a valve (55) for by-passing the air flow may be provided between the space (11) in the pressure vessel and the freeboard (18) of the combustion chamber (8) for reducing the air flow through the bed. Further, control means (38, 80) are provided for carrying out the necessary operations of valves, and the like, during the start-up operation.

대표청구항 ▼

A method of igniting a combustion chamber in a power plant for combustion of fuel in a fluidized bed of particulate bed material which is supplied with air at the bottom of the combustion chamber for fluidization of the bed and for combustion of fuel supplied to the bed, characterized in that bed ma

A method of igniting a combustion chamber in a power plant for combustion of fuel in a fluidized bed of particulate bed material which is supplied with air at the bottom of the combustion chamber for fluidization of the bed and for combustion of fuel supplied to the bed, characterized in that bed material heated to at least the self-ignition temperature of a fuel is stored in an isolated container, separated from the combustion chamber, at a level above the bottom of the combustion chamber, that heated bed material is transferred to the combustion chamber via a vertical or greatly inclined conduit with a shut-off device, and that a startup fuel is supplied to said bed material in connection with or immediately after the transfer to the combustion chamber.