Boiler Economizer Efficiency Calculation

Economizer Efficiency Equation:

\[ \eta_e = \frac{T_{out} - T_{in}}{T_{flue} - T_{in}} \times 100 \]

Outlet Temperature (T_out):

°C

Inlet Temperature (T_in):

°C

Flue Gas Temperature (T_flue):

°C

Economizer Efficiency (η_e):

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1. What is Economizer Heat Recovery Efficiency?

Economizer heat recovery efficiency (η_e) measures how effectively an economizer transfers heat from flue gases to feedwater in a boiler system. It represents the percentage of available heat that is actually recovered.

2. How Does the Calculator Work?

The calculator uses the economizer efficiency equation:

\[ \eta_e = \frac{T_{out} - T_{in}}{T_{flue} - T_{in}} \times 100 \]

Where:

\( \eta_e \) — Economizer efficiency (%)
\( T_{out} \) — Outlet temperature (°C)
\( T_{in} \) — Inlet temperature (°C)
\( T_{flue} \) — Flue gas temperature (°C)

Explanation: The equation calculates the ratio of actual temperature rise to the maximum possible temperature rise, expressed as a percentage.

3. Importance of Economizer Efficiency

Details: High economizer efficiency indicates effective heat recovery, leading to improved boiler efficiency, reduced fuel consumption, and lower operating costs. Typical economizer efficiencies range from 60% to 85%.

4. Using the Calculator

Tips: Enter all temperatures in °C. Ensure T_flue > T_in > 0 and T_out > T_in for valid calculations. Measurements should be taken under stable operating conditions.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical economizer efficiency range?
A: Well-designed economizers typically achieve 70-85% efficiency, depending on design, flue gas temperature, and operating conditions.

Q2: Why can't efficiency reach 100%?
A: 100% efficiency would require T_out = T_flue, which is thermodynamically impossible due to heat transfer limitations and practical constraints.

Q3: What factors affect economizer efficiency?
A: Key factors include heat transfer surface area, flue gas velocity, water flow rate, fouling conditions, and temperature differences.

Q4: When should economizer efficiency be measured?
A: Regular measurements help monitor performance degradation, identify maintenance needs, and optimize boiler operation.

Q5: How can economizer efficiency be improved?
A: Methods include cleaning heat transfer surfaces, optimizing flue gas flow, reducing air infiltration, and maintaining proper water chemistry.