Fossil fuels—coal, oil, and natural gas—are America’s primary
source of energy. America’s annual consumption of fossil fuels
grown rapidly. 89 % of these consumption are consumed by
boilers, transportation, residential usage, fuels for direct
heating of process. The balance is used for feed-stocks, raw
materials, and other miscellaneous uses. And most of the dirty
fuels such as coal and residual oil go into boilers. Fuel burned
are by far the largest single source of air pollution. This
pollution is from sulfur oxide. It is also a significant source
of particulate matter and nitrogen oxides. Boiler combustion is
sufficiently important to warrant the effort to analyze the
complete nature of the problems. Fuel consumption in boilers is
divided into three sectors: utility boilers producing steam for
generation of electricity which is actually consuming probably
59%, industrial boilers producing steam or hot water for process
heat,generation of electricity or space heat consuming about
24%, and boilers for space