METHOD OF PARTIAL LOAD OPERATION IN PRESSURIZED FLUIDIZED BED COMBUSTION PLANT AND PRESSURIZED FLUIDIZED BED COMBUSTION PLATE

摘要

PURPOSE: To enhance thermal efficiency in a plant and enable the establishment by self-operation of a gas turbine to be established even at the time of the partial load operation of a pressurized fluidized bed combined plant. ;CONSTITUTION: When an exhaust gas temperature in a pressurized fluidized bed boiler 4 is decreased during a partial load operation in a plant, secondary fuel and secondary air are fed into a secondary combustion section 32 provided above a primary combustion section 31 in the pressurized fluidized bed boiler to heat the exhaust gas from the primary combustion section to a high temperature by combustion in the secondary combustion section, and the resultant high-temperature exhaust gas is introduced into a gas turbine 2. This method enhances thermal efficiency in a plant during its partial load operation and enables self-operation of a gas turbine to be established. Further, when the concentration of residual oxygen in primary combustion gas is fluctuated due to changes in a fuel-air ratio in the primary combustion section, a secondary air quantity necessary for complete combustion of the primary combustion gas is charged into the secondary combustion section 32.;COPYRIGHT: (C)1993,JPO&Japio