How To Calculate Ultimate Analysis Of Coal

Ultimate analysis of coal is a critical process that determines the composition of coal on a dry, ash-free basis. It’s essential for understanding the heating value, combustion behavior, and environmental impact of coal.

1. Enter the moisture, ash, volatile matter, and fixed carbon percentages.
2. Click the “Calculate” button.
3. View the results and chart below.

The calculator uses the following formulas:

• Heating Value = (Fixed Carbon * 34.2) + (Volatile Matter * 14.7) + (Moisture * 0) – (Ash * 13.2)
• Carbon Content = Fixed Carbon + (Volatile Matter * 0.85)

Coal Types and Ultimate Analysis

Coal Type	Moisture (%)	Ash (%)	Volatile Matter (%)	Fixed Carbon (%)

Heating Values of Different Coals

• Always use fresh, representative coal samples for analysis.
• Ensure accurate moisture determination for reliable results.
• Consider using professional lab services for complex analyses.

What is the difference between proximate and ultimate analysis?

Proximate analysis determines the moisture, volatile matter, fixed carbon, and ash content of coal on an as-received basis. Ultimate analysis determines the composition on a dry, ash-free basis.

EPA Coal Basics – Heating Values of Coal