Utilidades industriais/Gases industriais/G\303\241s de combust\303\243o.md ..
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The composition of the flue gas will vary depending on the fuel used in the combustion. The main combustion products are carbon dioxide (CO₂) and steam. Nitrogen is also present, since it is a component of the atmospheric air used in the combustion and is normally inert, so it will exit in the flue gas along with the other gases. Oxygen may also be present, due to excess used to enforce complete combustion. Other components can also be present: if the combustion is incomplete, carbon monoxide (CO) and carbon particles can also be formed; if the fuel has nitrogen or sulfur in its composition, the combustion can form nitrogen oxides (NOₓ) and/or sulfur oxides (SOₓ). Furthermore, if the temperature of the combustion is high enough, nitrogen will no longer be inert, and it will oxidize, forming nitrogen oxides. The composition of the flue gas can be estimated doing the molar balance to the combustion unit. For example, if the combustion of biogas, which is mainly methane (CH₄, ~60%, CO₂ ~40%), is considered, the molar balance can be done as follows:
