Patent ID: 11898751
Assignee: IHI CORPORATION
Field: Measurement (Instruments)
Classification: CPC F  G | IPC F

Claim 8:
9. A method for operating a coal-fired boiler comprising
a coal-ash generating step for ashing coal into coal ash,
a sintered-ash generating step for heating the coal ash generated in said coal-ash generating step at a plurality of temperatures within a combustion temperature range of the coal-fired boiler to generate sintered ash at each of the heating temperatures,
a sticking-degree calculating step for rotatively separating each sintered ash generated in said sintered-ash generating step by a ratra tester to calculate a sticking degree from a weight ration of the sintered ash after and before the rotary separation thereof,
a correlation determining step for burning each coal having a corresponding sticking degree calculated in said sticking-degree calculating step in the coal-fired boiler to measure an exhaust gas temperature to thereby determine a correlation between sticking degrees and exhaust gas temperatures,
an exhaust-gas-temperature predicting step for predicting an exhaust gas temperature from a sticking degree of coal to be employed as fuel on the basis of the correlation between the sticking degrees and the exhaust gas temperatures obtained in said correlation determining step and
a combustion-time adjusting step for adjusting a combustion time of said coal on the basis of the exhaust gas temperature predicted in said exhaust-gas-temperature predicting step.