Coal Heating Values

Overview

Engineering reference data for Coal Heating Values in material science and properties.

Key Formulas

Stress

$\sigma = \frac{F}{A}$

Force per unit area.

Strain

$\varepsilon = \frac{\Delta L}{L_0}$

Change in length per original length.

Hooke's Law

$\sigma = E \varepsilon$

Stress proportional to strain in elastic region.

Thermal Expansion

$\Delta L = \alpha L_0 \Delta T$

Length change due to temperature.

Variables

Symbol	Description	Unit
$\sigma$	Stress	Pa
$\varepsilon$	Strain	—
$E$	Young's modulus	Pa
$\alpha$	Thermal expansion coefficient	1/°C
$\Delta T$	Temperature change	°C

Coal Heating Values by Grade

Coal Grade Descriptions

• Anthracite: Very shiny, hard black coal with high carbon content and energy density. Repels moisture. Used for domestic and industrial applications, including as smokeless fuel.
• Bituminous: Softer and shiny, with a moisture content of 8-20%. Can be coking coals. Volatile matter ranges from 16% to 40%. Used for thermal or metallurgical applications.
• Sub-bituminous: Soft and black, with lower energy density than bituminous coal. Most common type for electricity generation.
• Lignite: Light brown with high moisture content and low energy density. Used mainly for electricity generation.

Interactive Charts

References

• Original Source