Fired Heater

Furnace and fired heater thermal duty, efficiency, fuel consumption, and flue gas analysis

Fuel Type

Process Conditions

Process Fluid Flow Rate (kg/h)

Inlet (°C)

Outlet (°C)

Heat Capacity (kJ/kg·K)

Combustion Settings

Excess Air (%)

Typical: 10–20% for complete combustion

Ambient Temperature (°C)

Air Preheater

+5–10% efficiency

Preheat combustion air with flue gas

Economizer

+3–5% efficiency

Preheat feedstock or generate steam

Optimize Excess Air

+2–5% efficiency

Maintain 10–15%, use O₂ trim control

Improve Insulation

+1–3% efficiency

Repair/upgrade refractory and casing

Furnace Performance

Heat Duty

1,388.89

Thermal Efficiency

95.0%

LHV basis

Optimal range

Fuel & Combustion

Fuel Consumption:109.6491 Nm³/h

Heat Input:1,461.99 kW

Air/Fuel Ratio:19.9

Flue Gas Temp:350°C

Heat Distribution

Radiant Section:902.7778 kW (65%)

Convection Section:486.1111 kW (35%)

Heat Balance

Absorbed by Process:95.0%

Stack Loss:5.3% of losses

Radiation Loss:50.0% of losses

Other Losses:10.0% of losses