Coal Syngas Heating Value & Wobbe Index Calculator

Determine Lower Heating Value (LHV), Higher Heating Value (HHV), Wobbe Index (MJ/Nm³ & Btu/scf), and stoichiometric air requirements from syngas molar fractions.

Dry Syngas Molar Composition (vol%)

Hydrogen H₂ (% vol):

Carbon Monoxide CO (% vol):

Methane CH₄ (% vol):

Carbon Dioxide CO₂ (% vol):

Nitrogen N₂ (% vol):

Gas Temperature / Reference Basis:

Calorific Properties & Combustion Index

Lower Heating Value (LHV):

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Higher Heating Value (HHV):

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Wobbe Index (W_LHV):

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Specific Gravity relative to Air:

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H₂ / CO Molar Ratio:

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Stoichiometric Air Requirement:

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Frequently Asked Questions

Why is hydrogen flashback a challenge when burning syngas in gas turbines?

Hydrogen has a laminar flame speed (over 200 cm/s) that is five to seven times faster than natural gas (methane ~38 cm/s). If fuel velocity drops, the flame can propagate backward into the premixing fuel nozzle ("flashback"), destroying the combustor basket.

What is the difference between LHV and HHV in syngas?

Higher Heating Value (HHV) includes the latent heat of vaporization recovered when combustion water vapor condenses into liquid water (2.44 MJ/kg H2O). In industrial gas turbines and boilers, flue gas exits above 120°C, meaning water never condenses; hence LHV governs practical engineering efficiency.