Coal briquettes (compressed coal fines) are widely used as a lower-cost alternative to lump coal for industrial boilers. But how do they compare to biomass pellets? This comparison addresses the question that procurement managers in textile mills, brick kilns, and ceramic units across Gujarat frequently ask.
What Are Coal Briquettes?
Coal briquettes are made by compressing coal fines (fine-grained coal dust) with a binder (typically starch or molasses) into pillow or cylindrical shapes. They are cheaper than lump coal but retain all coal's environmental drawbacks — high ash, high sulphur, and no carbon credit eligibility.
Head-to-Head Comparison
| Parameter | Coal Briquettes | BBI Biomass Pellets |
|---|---|---|
| GCV (Kcal/kg) | 3,200–4,000 | 4,200–4,600 |
| Ash content | 20–35% | <2% |
| Sulphur content | 0.4–1.2% | <0.1% |
| Moisture | 10–20% | <10% |
| Price (₹/kg) | ₹8–₹10 | ₹9–₹11 (bulk) |
| Cost per useful Kcal | ₹2.5–₹3.1 | ₹2.0–₹2.6 |
| GPCB compliance risk | High (SO₂, PM) | Low |
| Carbon credits eligible | No | Yes |
| Co-firing mandate compliant | No | Yes |
Boiler Compatibility
Travelling grate boilers: Both coal briquettes and biomass pellets work. Biomass pellets have lower bulk density (600–700 kg/m³ vs 900–1,100 kg/m³ for coal briquettes), so feed rates need adjustment.
Stoker boilers: Biomass pellets are significantly better — lower ash means less frequent de-ashing, longer grate life, and cleaner operation.
Fluidized bed boilers: Biomass pellets are preferred — uniform size and low ash make them ideal for fluid bed combustion.
The Verdict
Coal briquettes are marginally cheaper per kg but deliver less heat, more ash, and more regulatory risk. On a cost-per-useful-Kcal basis, BBI biomass pellets are cost-competitive with coal briquettes — and carbon-neutral, GPCB-compliant, and co-firing eligible. For any boiler under GPCB scrutiny or subject to MoP co-firing obligations, biomass pellets are the clear choice.
Get a custom comparison for your specific boiler — contact BBI for a fuel assessment.