Liquefied Natural Gas Lng

Overview

Engineering reference data for Liquefied Natural Gas Lng 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	—

LNG Physical Properties

LNG (Liquefied Natural Gas) is produced by cooling natural gas to -161°C (-258°F) at atmospheric pressure. Prior to liquefaction, impurities and heavy hydrocarbons are removed, leaving a liquid that is primarily composed of methane.

Key Characteristics

• Density: LNG density ranges from 410 kg/m³ to 500 kg/m³.
• Volume Reduction: The volume of LNG is approximately *1/600 of the volume of natural gas at standard atmospheric conditions (e.g., 15°C and 1 atm).

References

• Original Source