Which CO2 reading indicates the lowest excess in flue gas?

Which CO2 reading indicates the lowest excess in flue gas?

• A. 5%
• B. 10%
• C. 15%
• D. 20%

Answer: (C)

In the context of evaluating excess CO2 in flue gas, a lower percentage indicates less excess carbon dioxide and generally signifies better combustion efficiency. Therefore, among the provided options, the percentage that indicates the lowest excess concentration in the flue gas is 5%. A 5% CO2 reading suggests that the combustion is relatively efficient, as it indicates that most of the carbon in the fuel has been converted to CO2. In contrast, higher percentages, such as 10%, 15%, or 20%, reflect increasing levels of excess CO2, which can indicate incomplete combustion where unburned fuel is present. Therefore, 5% would be indicative of the best combustion scenario, not 15%. This understanding aids in optimizing combustion processes and ensuring that emissions control practices are effectively implemented.

In the context of evaluating excess CO2 in flue gas, a lower percentage indicates less excess carbon dioxide and generally signifies better combustion efficiency. Therefore, among the provided options, the percentage that indicates the lowest excess concentration in the flue gas is 5%.

A 5% CO2 reading suggests that the combustion is relatively efficient, as it indicates that most of the carbon in the fuel has been converted to CO2. In contrast, higher percentages, such as 10%, 15%, or 20%, reflect increasing levels of excess CO2, which can indicate incomplete combustion where unburned fuel is present. Therefore, 5% would be indicative of the best combustion scenario, not 15%. This understanding aids in optimizing combustion processes and ensuring that emissions control practices are effectively implemented.