Engineering Tool

Furnace Fouling Cost Calculator

Quantify excess fuel gas penalties, daily/annual financial costs, and greenhouse gas emission surges resulting from heat exchanger fouling in fired heaters.

Process & Economic Inputs

Clean Furnace Duty (GJ/h)47.67 GJ/h

Current / Fouled Furnace Duty (GJ/h)61.59 GJ/h

Fired Heater Efficiency (%)85%

Fuel Price ($/GJ)$6/GJ

Operating Hours per Year (h/yr)8000 hrs

Fuel CO2 Factor (kg CO2 / GJ fuel)56.1

Calculated Energy Penalties

+29.2% Penalty

Extra Fuel Cost / Hour

$98.26 / hr

Extra Fuel Cost / Day

$2358.21 / day

Annual Financial Penalty

$786,071 / year

Additional CO2 / Day

+22.0 MT CO2/day

Additional CO2 / Year

+7,350 MT CO2/yr

Estimates calculated based on steady-state thermal balances.

Governing Engineering Equations

1. Extra Process Duty: ΔQ_process = Q_fouled - Q_clean

2. Extra Fuel Gas Duty: ΔQ_fuel = ΔQ_process / (Efficiency / 100)

3. Hourly Fuel Cost: Cost_hr = ΔQ_fuel × Fuel_Price

4. Annual Cost: Cost_yr = Cost_hr × Operating_Hours

Need this analysis connected directly to your Aspen HYSYS model?

We integrate Python Win32 COM automation scripts into Aspen flowsheets to continuously monitor exchanger U-values and calculate optimal cleaning schedules.

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