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Boilers are able to achieve a good combustion. Oxygen content percentage of up to 5% or lower can be achieved.
Internal combustion engines have a lot of excess air because mixing of
combustible mixture is a challenge for them. Furthermore, combustion is meant to provide power to drive pistons.
The burning of sulphur in fuel is a problem for combustion equipment. This is because byproducts of combustion will create sulphur dioxide and sulphur trioxide. These will react with water, also a byproduct of combustion of Hydrogen to form sulphuric acid and sulphurous acid.
SO3 + H2O = H2SO4 SO2 + H2O = H2SO3 2H2SO3 + O2 = H2SO4
However, effects of corrosion, called low temperature corrosion can be avoided by keeping temperature above dewpoint. That means to keep exhaust temperature high so that water droplets will not form on exhaust ducts.
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