UCG Steam-Oxygen Stoichiometry & Syngas Ratio Calculator

Balance in-situ coal gasification stoichiometry, optimize steam-to-oxygen injection molar ratio (H2O / O2), and calculate Cold Gas Efficiency (CGE).

Coal Ultimate Analysis (% dry basis)

Carbon C (% wt):

Hydrogen H (% wt):

Oxygen O (% wt):

Moisture Content in Seam (% wt):

Injected Steam / Oxygen Ratio (kg steam / Nm³ O2): Controls cavity gasifier temperature

Gasification Temperature (°C):

Stoichiometric Balance & Thermal Efficiency

Cold Gas Efficiency (CGE):

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Equilibrium H₂ / CO Ratio:

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Syngas Yield per kg Coal:

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Oxygen Consumption:

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Carbon Conversion Efficiency:

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Gasifier Thermal Regime:

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Frequently Asked Questions

Why is steam injected alongside oxygen in UCG?

Injecting pure oxygen without steam causes flame temperatures to spike past 1,600°C, melting coal ash into glassy liquid slag that covers reactive coal faces. Steam moderates the temperature via the endothermic water-gas reaction and boosts hydrogen yield.

What is Cold Gas Efficiency (CGE)?

Cold Gas Efficiency is the ratio of chemical energy contained in the cooled product syngas (Heating Value × Volume) to the chemical energy of the gasified coal fed into the system. High-performance UCG operations achieve CGE between 65% and 80%.