Flash Point Fuels

Overview

Engineering reference data for Flash Point Fuels 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	—

Flash Point Data

The following table lists the flash points of common fuels and chemicals at atmospheric pressure. Higher flash points indicate lower flammability and reduced hazard.

Temperature Conversion

To convert flash point temperatures from Fahrenheit to Celsius, use the following formula:

$T_c = \frac{5}{9} (T_f - 32)$

Where:

• $T_c$ is the temperature in degrees Celsius (°C)
• $T_f$ is the temperature in degrees Fahrenheit (°F)

This conversion is useful for standardizing data across different unit systems.

Autoignition Temperature Note

The autoignition temperature is distinct from the flash point. It represents the minimum temperature at which a substance ignites spontaneously in air without an external spark or flame. In hazardous area classification, equipment temperature ratings are often based on the autoignition temperatures of surrounding substances to prevent accidental ignition.

References

• Original Source