STEAM TEMPERATURE CONTROL METHOD FOR FLUIDIZED BED BOILER

PURPOSE:To control a reheat steam temperature and enhance the thermal efficiency of a reheat cycle without using a reheater spray. CONSTITUTION:A vaporizer 2, a low temperature superheater 3, a high temperature superheater 4 and a reheater 5 are laid out in a fluidized bed furnace 1 where a bed heig...

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Bibliographic Details
Main Authors SHINODA KATSUHIKO, GENGO TADASHI, FUJIMOTO AKIHIKO, TOYODA TAKAHARU
Format Patent
LanguageEnglish
Published 23.07.1993
Subjects
BLASTING
HEATING
LIGHTING
MECHANICAL ENGINEERING
METHODS OF STEAM GENERATION
STEAM BOILERS
STEAM GENERATION
SUPERHEATING OF STEAM
WEAPONS
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Summary:PURPOSE:To control a reheat steam temperature and enhance the thermal efficiency of a reheat cycle without using a reheater spray. CONSTITUTION:A vaporizer 2, a low temperature superheater 3, a high temperature superheater 4 and a reheater 5 are laid out in a fluidized bed furnace 1 where a bed height 7a of a common fluidized bed can be controlled by a bed height control device 6. The amount of evaporation of the vaporizer 2 is controlled by means of the bed height 7a while the superheated steam temperature of a high temperature superheater is controlled by means of a superheat spray 17. Furthermore, the superheated steam temperature of the reheater 5 is controlled by changing the temperature of the fluidized bed respectively. In this case, there is installed a shielding plate 22 between the high temperature superheater 4 and the reheater 5, thereby changing the temperature of the fluidized bed of the reheater 5 independently of the fluidized bed temperatures of the superheaters 3 and 4 and enabling the reheat steam temperature to be controlled. The shielding plate 22 is provided with a clearance 23 in its lower part and enables a fluidized material to be transferred.
Bibliography:Application Number: JP19910358104