Underground Coal Gasification Cavity Growth Calculator

Model subterranean gasification cavity lateral and vertical expansion rates (m/day), coal consumption tonnage, and syngas generation using CRIP channel geometry.

Operational & Seam Parameters

Oxygen/Air Injection Rate Q_ox (Nm³/h):

Gasifying Agent:

Coal Seam Thickness h (m):

Coal In-Situ Density (ton/m³):

Operating Cavity Pressure (bar g):

Lateral-to-Vertical Growth Ratio (W/H):

Cavity Dimensions & Gas Production

Daily Coal Gasified:

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Dry Syngas Production Rate:

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Cavity Volume Growth Rate:

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CRIP Burn Front Advance:

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Thermal Energy Output:

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Oxygen-to-Coal Ratio:

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Frequently Asked Questions

How deep must a coal seam be for safe UCG?

Commercial UCG projects target seams between 300 m and 1,500 m (1,000 to 5,000 ft) depth with an impermeable, thick overburden caprock (such as ductile shale) to prevent surface subsidence and hydraulic connection to drinking aquifers.

What is the syngas composition difference between air and oxygen gasification?

Air gasification yields low-BTU syngas (~3.5 to 5.0 MJ/Nm³) containing 45% to 55% inert nitrogen. Enriched oxygen/steam injection eliminates nitrogen, producing medium-BTU syngas (~9.5 to 12.5 MJ/Nm³) rich in hydrogen (30-40%) and carbon monoxide (20-30%).