Catalytic flue gas desulfurization and denitration performance indicators
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For catalytic flue gas emission, only sulfur dioxide, nitrogen oxides, and dust are subject to control requirements – why are there no such requirements for sulfur trioxide? From the perspective of the NaOH desulfurization mechanism, it is also ineffective against sulfur trioxide – is this because no specific requirements exist, so it isn’t taken into account in the process design?
SO3 dissolves in water and reacts with it to form sulfuric acid. So there’s no need to consider it.
At present, there is no stable and reliable method for detecting sulfur trioxide in flue gas; therefore, the (Pollutant Emission Standards for the Petroleum Refining Industry GB-31570-2015) do not specify any requirements in this regard.
Sulfur trioxide may require a low-temperature electrostatic precipitator system to be installed upstream of the desulfurization process for its removal; it is difficult to ensure effective removal of sulfur trioxide using wash towers.