EMISSION CONTROL SYSTEM

摘要

Methods and apparatus utilizing chlorine dioxide and hydrogen peroxide are useful to reduce emissions of NOx, SOx and heavy metals, e.g., mercury, emissions from combustion flue gas streams. The method may include scrubbing the gas stream with a first hydrogen peroxide solution, thereby producing a first scrubber liquor; maintaining a desired hydrogen peroxide concentration in the first scrubber liquor by regulating a flow of the first hydrogen peroxide solution; after scrubbing the gas stream with the first hydrogen peroxide solution, contacting the gas stream with gaseous chlorine dioxide; and after contacting the gas stream with the gaseous chlorine dioxide, scrubbing the gas stream with a second hydrogen peroxide solution, thereby producing a second scrubber liquor.