PRESSURIZED FLUIDIZED-BED BOILER

PURPOSE:To shorten the start-up time and protect metals of superheater tubes and reheater tubes by locating the lowermost part of the superheater tubes higher than that of the evaporator tubes. CONSTITUTION:A pressurized fluidized-bed boiler 2 is housed in a pressure vessel 1 of a pressurized fluidi...

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Bibliographic Details
Main Authors MOTAI SATOKI, ISHIGAMI SHIGEYASU, TOYODA TAKAHARU
Format Patent
LanguageEnglish
Published 13.04.1992
Subjects
AIR
BLASTING
COMBUSTION APPARATUS
COMBUSTION PROCESSES
HEATING
LIGHTING
MECHANICAL ENGINEERING
METHODS OF STEAM GENERATION
METHODSOR APPARATUS FOR COMBUSTION USING FLUID FUELOR SOLID FUEL SUSPENDED IN
STEAM BOILERS
STEAM GENERATION
WEAPONS
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Summary:PURPOSE:To shorten the start-up time and protect metals of superheater tubes and reheater tubes by locating the lowermost part of the superheater tubes higher than that of the evaporator tubes. CONSTITUTION:A pressurized fluidized-bed boiler 2 is housed in a pressure vessel 1 of a pressurized fluidized-bed boiler. The pressurized fluidized-bed boiler 2 consists of a fluidized bed A and a free board B, and evaporator tubes 4 and superheater tubes 5 are provided inside the fluidized bed B. At 100% load, the surface of the fluidized bed A is kept at a 100% load level H, and all the heat transfer tubes are submerged in the fluidized bed A, however, at start-up, the surface of the fluidized bed is lowered to a start-up level M. Thereby, only some of the evaporator tubes 4 are submerged in the fluidized bed A and the remaining heat transfer tubes are exposed in the free board B. Therefore, as only the evaporator tubes 4 directly absorb heat in the fluidized bed A at start-up, steam can be generated without anxiety about the metal temperature of the superheater tubes 5, so that the start-up time is shortened.
Bibliography:Application Number: JP19900226462