Abstract
The SO2 emission control of coal burnt gas in the U.S.A.is des-cribed with introducing the New Stationary Sources Performance Standard, with summari-zing the current SO2 removal processes, and with marking another particular movements.All the new coal burning boilers larger than 250 MMBtu of hourly heat input have to install some kinds of sulfur removal facilities. Limestone scrubbing of the flue gas is the present major technology, f ollowed by lime scrubbing and dual alkali methods in the utili-ties. Soda ash scrubbing is the major in another industries which are dominated by smaller size boilers.Japanese flue gas desulfurization technologies are also favorably evaluated in the States.
