ABSTRACT
Global SO2 emission by human activity has now reached about 100 million tons yearly. Flue gas desulfurization (FGD) has become popular in many countries, and with a total capacity of 170 000MWe, is expected to remove nearly 10 million tons of SO2 in 1989. There are currently about 2000 FGD plants in existence for boilers, furnaces, etc. that remove more than 80% of the SO2 produced. In addition, lime is injected at about 1000 municipal solid waste (MSW) incinerators to remove 40-90% of acid gas. Over 90% of FGD plants are installed in three countries: the USA, Japan and the FRG (Table 1). The process is also used in Austria, the Netherlands and Sweden.
