Coal Gasification
- Blogs
- September 15, 2025
Syllabus: GS3 — Environment / Energy
In News:
- Government set up a committee to review mining-plan guidelines and add provisions for Underground Coal Gasification (UCG).
Context / About
- Coal gasification transforms coal into synthesis gas (syngas): a mixture whose main combustible components are hydrogen (H₂) and carbon monoxide (CO), and which may contain CO₂ and small hydrocarbons.
- Syngas is a feedstock for power generation (combined-cycle gas turbines), chemicals (methanol, dimethyl ether), and fertiliser manufacture (e.g., via hydrogen/urea routes).
- Underground Coal Gasification (UCG) involves converting in-situ coal seams into syngas by injecting oxidants (air/oxygen/steam), igniting the seam under controlled conditions and extracting produced gas to the surface.
Significance / Importance
- Leverages India’s abundant coal reserves — reduces near-term dependence on imported gas/chemical feedstocks.
- Enables utilisation of deep, otherwise-unmineable coal seams with limited surface disturbance — beneficial for interior states with trapped resources.
- Can support domestic coal-to-chemicals complexes, promoting regional industrialisation and employment.
- Potential to produce cleaner synthetic fuels (methanol, DME, synthetic natural gas) and to integrate CO₂ capture and utilisation/storage (CCUS) economically at scale.
Challenges / Concerns
- Environmental risks: possible groundwater contamination (tars, phenolics, benzene), uncontrolled subsidence, fugitive emissions and local air pollution if not well-managed.
- Technical controls required: precise hydrogeologic characterisation, reliable cavity control, product-gas clean‑up and monitoring systems.
- GHG footprint: unless CO₂ is captured and stored/used, syngas-derived fuels still emit CO₂ — lifecycle emissions depend on process design and CCUS deployment.
- Regulatory, land‑use and community consent issues will influence project siting and acceptability.
Do you know?
- Syngas can be converted to liquid fuels via Fischer–Tropsch synthesis or to methanol (and onward to DME) — chemical routes commonly considered for coal-to-liquids/chemicals.