Abstract: A method of and a system for reducing an excessive amplitude of unbalance vibration occurring in a rotor by actually measuring and comparing the unbalance vibration amplitude of the rotor with a desired level for judgement as to whether the desired value is exceeded, selecting a certain correction plane combination in accordance with the measured unbalance vibration amplitude. A correction mass to be added to the rotor is calculated using an influence coefficient corresponding to the selected correction plane combination, assuming that the correction mass is added to the rotor, estimated residual vibration amplitudes and root mean squares thereof are calculated at respective correction plane position combinations each having at least any two of positions of a plurality of correction planes on the rotor.

Abstract: The method is characterized by bringing a mixture of ammonia and air to a temperature substantially equal to the temperature of the waste flue gas in the flue at the exit of an air heater, and then injecting the mixture into the flue from a number of nozzles arranged in uniformly spaced relation in the flue while regulating the respective flow rates thereof.