Shmigol I.N., Open JSC “VTI”
Any organic fuel, except natural gas, contains sulfur as a part of its organic fraction (organic sulfur), or in the form of pyrite FeS2, included in its mineral component.
Sulfur dioxide and trioxide are produced at oxy-firing of fuel sulfur:
S + O2 = SO2;
2FeS2 + 5O2 = 2FeO + 4SO2.