Coal has been and will remain a major source of electricity generation for the world. Unfortunately, the demerit associated with coal-fired energy generation systems is the pollutant gaseous emissions such as NOx, SO2, and CO2 etc. There is an increasing concern for regulating air quality and offsetting the emissions from coal- fired power plants due to more stringent limits on these emissions.New technologies are not yet competitive to totally replace coal based power generation.Coal fired power generation companies are striving for cost effective and efficient retrofit...