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Question 8.1: A flue gas analysis of an oil fuel-fired boiler indicates th...

A flue gas analysis of an oil fuel-fired boiler indicates that the CO_{2} content is 11 percent with a gas flue temperature of 343°C (650°F). Determine the overall thermal efficiency of the boiler. Use oil No. 2.

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By reading the monograph of Figure 8.4, the combustion occurs with excess air of 38 percent and excess O_{2} of 6 percent. The overall boiler thermal efficiency is about 78 percent.

8.4

Related Answered Questions

The boiler of Example 8.1 uses 1,500,000 L of fuel oil per year. An instrumentation kit is purchased at a cost of $20,000 and is used to adjust the boiler operation so its excess of O2 is only 3 percent. Determine the payback of the instrumentation if the cost of fuel oil is $0.20/L.

Verified Answer:
From Example 8.1, the existing boiler has excess [...