CIRCULATING FLUIDIZED BED BOILER AND OPERATION METHOD OF THE BOILER

摘要

PROBLEM TO BE SOLVED: To provide a circulating fluidized bed boiler and an operation method of the boiler, in which a circulation failure of a circulating material can be early detected.;SOLUTION: The circulating fluidized bed boiler 1 includes: a combustion furnace 3 for burning fuel; a cyclone 7 which separates circulating material that is solid particle from combustion gas generated in the combustion furnace 3; a downcomer 9 which sends the circulating material separated in the cyclone 7 to the lower side; a loop seal portion 11 which seals a circulating flow passage 50 of the circulating material by the circulating material sent from the downcomer 9 to prevent the backflow of combustion gas from the combustion furnace 3 to the downcomer 9; pressure sensors 31, 33 which acquire a pressure difference between the pressure of the downcomer 9 and the pressure of a lower portion of the loop seal portion 11; and a control computer 35 which determines presence/absence of circulation failure of the circulating material based on information on the differential pressure. The control computer 35 determines the presence/absence of circulation failure based on a standard deviation of the differential pressure.;COPYRIGHT: (C)2013,JPO&INPIT