The produced SO2 from S combustion that is found in fuel oil burned by energy plants or large steam production units, is oxidized partially to SO3 which has immediate and harmful consequences both to the plant efficiency and the environment.
- Acid rain
- Acid particles surrounding the installation
Spaying of magnesia or magnesium hydroxide powder for immediate neutralization of SO3 and partially SO2.
MgO + SO3 -> MgSO4 [reaction 2]
In this application magnesia is the most suitable reagent, because, besides the stoichiometric advantage, its main competitor CaO can not be used due to the formation of gypsum which creates hard deposits, blockage problems and other unit operational problems.
Spaying of the fine and reactive magnesia powder at the preheaters (LUVO) neutralises SO3 according to reaction  and prevents as the formation of sulphuric acid according to reaction  thus avoiding the destructive consequences for both the istallation and the environment.
Suspensions of magnesia and Mg(OH)2 are usually sprayed at the combustion chamber, which, apart from their basic action [reaction 2], also bind low melting point particles of V, Na, K compounds and other constituents of fuel oil, avoiding in this manner formation of deposits and other problems in the burner.