REPORT DESCRIPTION
Industrial flue gas treatment system is a set of technologies which is used to remove hazardous gases such as sulphur dioxide ( SO2 ) and nitrogen oxide ( NOx ) from the emission of industries and power plants . Fossil fuels such as oil and coal contain specified amount of sulphur . When these fuels are combusted in the presence of air almost 95 % or more sulphur is directly converted into sulphur dioxide ( SO2 ). When flue gas has excess quantity of oxygen it is again converted into sulphur tri oxide ( SO3 ). In flue gas treatment system the flue gas is generally passed through an ash removal device and then through a SO2 absorber .
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Air pollution is treated as the most serious problem now a day . The increase in the number of industries and power plants lead to emission of sulphur dioxide and other gases in atmosphere . This sulphur dioxide directly reacts with vapors and other compounds in atmosphere to form acid rain and fog . The increasing concern about the atmosphere is the major driver for the market of flue gas treatment system . Reduction in the operating cost by the means of heat recovery , reduction in stack plume , improvement in operability of industries , are drawing social attention towards this market . Cost associated with the installation of gas treatment system and maintenance restricts the market somewhere . Strict policies regarding pollution control , advancement in technology and various incentive benefits provided by appropriate commissions for reducing emission bring new opportunities to the market .
Flue gas treatment systems are segmented on the basis of gases types that are required to be removed from the emission . For removal of NOX the flue gas is passed through a mixture of active catalyst . This converts nitrogen oxide ( NOx ) into naturally occurring nitrogen and water . Most of the FGD units are based on two levels , one for fly ash elimination and other for sulphur dioxide reduction . In wet scrubber system the flue gas usually passes all the way through a fly ash elimination device , either through an electrostatic precipitator or a wet scrubber then to a sulphur absorber . Various types of wet scrubber designs are used such as plate towers , venturi and mobile packet beds .