Discussion
Statement I: Sulphur dioxide emissions scale with the sulphur content of the fuel.
Statement II: Sulphur in the fuel oxidises almost completely during combustion.
In the light of the above statements, choose the correct answer.
Answer: D
Correct answer: Both Statement I and Statement II are correct
Both statements are correct and the second explains the first. Sulphur in a fuel oxidises almost completely to sulphur dioxide during combustion, so essentially all of it appears in the flue gas.
Emissions therefore scale directly with the fuel's sulphur content, which is what makes fuel specification such a powerful control: capping sulphur in marine fuel or in diesel cuts emissions in proportion, with no equipment required. Where high-sulphur fuel must be burned, flue gas desulphurisation removes the product instead, typically at 90 to 95 per cent.
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