PURPOSE: To prevent the generation of the local heating of the equipment at the rear stage of a pressurized fluidized bed boiler and the breakage by the thermal stress of the equipment by providing a unburnt combustibles burning part to burn the unburnt combustibles in the combustion gas between a combustion gas outlet of the pressurized fluidized bed boiler and a dust removing equipment.
CONSTITUTION: An unburnt combustibles burning part 11 to burn the unburnt combustibles in the combustion gas 45a is provided between a pressurized fluidized bed type boiler 2 and a dust removing equipment 24. The inner wall of the unburnt combustibles burning part 11 is heated with the high temperature gas generated by burning the propane gas 49 with the help of the air 50a to re-heat the combustion gas 45a brought into contact with the inner wall. In addition, oxygen 51 is fed as the oxidizing agent to burn the unburnt combustibles. The combustion gas 45b whose unburnt combustibles are re-heated is ≥99% in the combustion efficiency at the outlet. This gas is passed through a cyclone 25 and a high temperature filter 31 constituting a dust removing equipment, and the ash of 10 micron in grain size is successively removed by the equipment of each dust removing equipment in the order of the larger grain size.
MIYAMOTO TOMOHIKO
TOMURO JINICHI
YOSHII YASUO
HOKARI NOBUYUKI
INADA TORU
OKI KATSUYA
BABCOCK HITACHI KK