The maximum percentage of CO2 in a flue gas (from a carbonaceous fuel) can be_________________?
Correct answer: A. 21
- A. 21
- B. 77
- C. 79
- D. 29
Explanation
For combustion with air, the nitrogen accompanying the oxygen remains in the flue gas, limiting the theoretical dry CO₂ concentration to about 21% for a pure carbon fuel. Hydrogen and excess air reduce this percentage further.
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