Question 85Steam Plants - 1st Asst/Chief
70% to passIf an analysis of boiler flue gas determines there is no excess air for combustion, you should expect the nitrogen content of the flue gas to be approximately _______________.
A10.5%
B14.0%
C21.0%
D79.0%
AI Explanation
The correct answer is D) 79.0%. When there is no excess air for combustion, the nitrogen content of the flue gas will be approximately 79%. This is because the main components of air are nitrogen (79%) and oxygen (21%). When there is no excess air, the nitrogen content will remain at its original proportion in the air, which is around 79%. The other answer choices are incorrect because 10.5% and 14.0% are not the typical nitrogen content in flue gas without excess air, and 21.0% represents the oxygen content in air, not the nitrogen content.
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