Question 21Steam Plants - Assistant Engineer70% to pass
When burning fuel oil in a boiler, a high CO2 content is desired in the stack gas because _______________.
AI Explanation
The correct answer is C) more heat is liberated by the production of CO2 than CO.
The reasoning behind this is that when burning fuel oil in a boiler, the goal is to achieve complete combustion, resulting in the formation of carbon dioxide (CO2) rather than carbon monoxide (CO). The production of CO2 releases more heat energy compared to the formation of CO, as the complete oxidation of carbon to CO2 is a more exothermic (heat-releasing) reaction. This higher heat liberation is desired for efficient boiler operation and maximum heat transfer to the working fluid.
The other answer choices are incorrect because they either do not accurately describe the relationship between CO2 and heat liberation (A and D) or they do not address the primary reason for the high CO2 content in the stack gas (B).
Related Questions
#19 Assuming all burners are clean and the fuel oil is at the correct temperature, it is considered good practice to adjust the excess air until a light brown haze is obtained. With the aid of a chemical based flue gas analyzer, the percentage readings (not necessarily in order) should indicate _______________.#20 Which of the following chemicals is used in an Orsat apparatus to absorb carbon dioxide? #22 The absence of carbon monoxide in the flue gas of a boiler indicates _______________.#23 When a propulsion boiler is removed from service for an extended period, why should the firesides be thoroughly dried after water washing? #24 In a boiler equipped with an automatic feed water regulator, erratic variations in the water level could be caused by _______________.