LOW NOX BOILER

PROBLEM TO BE SOLVED: To suppress production of thermal NOx and fuel NOx in a two-stage combustion zone by providing a re-circulation exhaust gas charging port between a throttle part and an air nozzle for two-stage combustion, and introducing the recirculation gas therein in a boiler provided with...

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Bibliographic Details
Main Authors NISHIYAMA NORIAKI, ITO YUKIYA, SHIRAHA MICHIHIRO, MORI HIROYUKI
Format Patent
LanguageEnglish
Published 16.05.1997
Edition6
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:PROBLEM TO BE SOLVED: To suppress production of thermal NOx and fuel NOx in a two-stage combustion zone by providing a re-circulation exhaust gas charging port between a throttle part and an air nozzle for two-stage combustion, and introducing the recirculation gas therein in a boiler provided with a throttle part to which the refractory material is attached. SOLUTION: A throttle part 3 is formed on a combustion gas flow-out part above the high temperature combustion zone 1. The throttle part 3 is provided with a recirculation exhaust gas charging port 8 which constitutes the two-stage combustion zone 2 in which an air nozzle 6 for two-stage combustion to feed the air to burn the unburnt part of the combustion gas to be discharged from the high temperature combustion zone 1 is arranged on a side wall, and consists of single stage or multiple stages in the middle zone between the high temperature combustion zone 1, and after a part of the combustion gas at a boiler outlet part is extracted by a fan for re-circulation exhaust gas and its pressure is boosted, the gas is fed to the two-stage combustion zone 2. The amount of the recirculation exhaust gas to be fed (combustion gas) is preferably around 10-40 % of the total volume of air for combustion.
Bibliography:Application Number: JP19950281764