Flue Gas Neutralization

Dry powder injection and Spray Dryer Absorber are two main processes used for incinerator Flue Gas Desulfurization. Neither system produces any waste water. Ca(OH)2, Mg(OH)2, and NaOH are most frequently used.

Spray dryer using Dual Flow nozzles produces large quantities of fine fog for quenching the flue gas. The same resort applies for caustic solution injection.

To remove NOx from the flue gas, either one of the two different systems is adopted: SCR (Selective Catalyst Reduction) or SNCR (Selective Non-Catalyst Reduction). For incinerators, SNCR is chosen if required. Two stages injection of methanol or urea solution will remove at least 80% of the NOx in flue gas.