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 __________.
• Complete combustion of fuel oil and its typical flue gas composition • Relationship between O₂, CO₂, and CO in efficient combustion • What a light brown haze from a boiler furnace usually indicates about air/fuel ratio
• If combustion is efficient and there is enough air but not too much, what happens to CO and CO₂ levels? • What does the presence of CO tell you about whether there was enough oxygen available during combustion? • If you add more excess air than ideal, what happens to O₂ and CO₂ percentages in the stack gas?
• Identify which option shows little or no CO (indicating nearly complete combustion) • Look for a choice with relatively low O₂ (only a modest amount of excess air) • Check that CO₂ is relatively high, which is typical of efficient fuel oil combustion with proper excess air
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