AMMONIA INJECTION METHOD AND DEVICE THEREFOR IN BOILER EXHAUST GAS TREATMENT EQIPMENT

摘要

PROBLEM TO BE SOLVED: To provide an ammonia injection method and a device therefor in a boiler exhaust gas treatment equipment capable of injecting an appropriate amount of ammonia by grasping SO3 concentration distribution in a duct at the upper flow side of an electric dust collector, reducing an operation cost and an equipment cost by reducing unreacted ammonia and being useful in preventing environment pollution.;SOLUTION: The ammonia injection method is characterized by continuously measuring SO3 concentration at plural points in the duct 5 of the upper side of an electric dust collector 3 by a SO3 densitometer 6 and injecting a corresponding amount of ammonia in accordance with the SO3 concentration distribution from an ammonia injection nozzle 7 to the corresponding points in the duct 5.;COPYRIGHT: (C)2002,JPO