Paraffins Alkanes Combustion

Overview

Engineering reference data for Paraffins Alkanes Combustion in combustion engineering.

Key Formulas

Heat Release

$Q = \dot{m} \cdot HV$

Fuel energy release rate.

Air-Fuel Ratio

$AF = \frac{m_{air}}{m_{fuel}}$

Mass of air per mass of fuel.

Excess Air

$EA = \frac{O_2}{21 - O_2} \times 100\%$

From flue gas oxygen measurement.

Variables

Symbol	Description	Unit
$Q$	Heat release rate	W
$\dot{m}$	Mass flow rate	kg/s
$HV$	Heating value	J/kg
$AF$	Air-fuel ratio	—

Data Table

Unit Conversion Factors

The following conversion factors are essential for working with the data in different unit systems.

$T(°C) = \frac{5}{9} (T(°F) - 32)$

$1 \, \text{ft/s} = 0.3048 \, \text{m/s}$

$1 \, \text{Btu/lbm} = 2{,}326.1 \, \text{J/kg} = 0.55556 \, \text{kcal/kg}$

Notes & Definitions

• LEL: Lower Explosive (or Flammable) Limit. The minimum concentration of a combustible gas or vapor in air that will ignite and burn if an ignition source is present.
• UEL: Upper Explosive (or Flammable) Limit. The maximum concentration that will ignite.
• *): In the original table, this notation typically indicates the property is for the gas form of the substance at standard conditions.

Interactive Charts

References

• Original Source