| 摘要 |
PROBLEM TO BE SOLVED: To prevent decrease in dust removing efficiency of a high temperature combustion exhaust gas by regulating a flowing speed of the gas entering a cyclone by a flow regulator based on smoke soot particle size distribution of the gas measured at an inlet of the cyclone, so that the distribution lies in a prescribed range. SOLUTION: An exhaust gas from a pressurized fluidized-bed boiler 1 is roughly removed of dust by a primary cyclone 7, precisely dust removed by a secondary cyclone 8, and supplied as a combustion exhaust gas to a gas turbine 10. Smoke dust is captured according to a particle size of the dusts by a cascade impactor 23 parallel with the cyclones 7, 8, weights are measured by a measuring instrument 24, and a particle size distribution is measured. When the particle size of the dust is increased, dampers of inlets of the cyclones 7, 8 are opened to decelerate the flowing speed of the gas, thereby preventing the wear of a castable material in the cyclone, while when the size of the dust is decreased, the damper is closed to accelerate the speed of the gas, thereby preventing decrease in dust collecting efficiency and preventing wear of the blade of the turbine 10.
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