Biomass Pellets for Paper & Pulp Industry: Replacing Coal in Power and Process Steam Boilers

India's paper and pulp industry is among the most energy-intensive manufacturing sectors. Paper mills in Gujarat (Vapi, Surat, Navsari) and Maharashtra (Pune, Kolhapur, Aurangabad) are under dual pressure: rising coal costs and PAT (Perform, Achieve, Trade) Scheme targets for specific energy consumption reduction. Biomass pellets are one option to evaluate against both challenges.

Energy Consumption in Paper Manufacturing

A typical small-to-mid-sized paper mill (50–200 TPD capacity) operates multiple boilers: a recovery boiler (for black liquor incineration in kraft mills), a power boiler (for captive electricity generation), and a process steam boiler. The power boiler is the most suitable for biomass pellet substitution.

Co-Firing vs Full Substitution

Mills evaluating biomass usually start with partial co-firing with coal in their power boilers before considering full substitution. Co-firing typically requires:

• Modification of coal feeders to handle pellet density (pellets are denser than coal fines)
• Air-fuel ratio recalibration by boiler OEM or licensed boiler engineer
• Stack emission re-baseline test after co-firing commencement

BBI's technical team can connect customers with boiler engineers experienced in biomass co-firing conversions in the paper sector.

PAT Scheme Benefit for Paper Mills

Whether biomass substitution counts toward a designated consumer's energy-saving target under BEE schemes depends on the scheme's current rules; check with BEE or your energy auditor. Pulp and paper is also a notified sector under the Carbon Credit Trading Scheme compliance mechanism (October 2025).

Supply Capacity for Large Paper Mills

BBI offers large-volume contracts of 200+ MT per month. Availability, delivery schedule and price basis for a paper mill's requirement should be agreed in a written quotation or supply agreement.

Which Paper Mill Boiler Can Actually Take Pellets

A paper mill rarely has one boiler problem. Pulp-side steam, the dryer section and captive power each sit on different equipment, and only some of it suits solid pellets. Start by drawing the steam map of your mill before any supplier visit.

Where pellets fit

• Coal-fired process steam boilers feeding the dryer cylinders, size press and stock heating.
• Captive power or cogeneration boilers where coal is the main fuel today.
• Thermic fluid heaters used for calendering or coating-line heating, where the plant has them.

Where pellets do not replace the existing fuel

• Kraft recovery boilers burn black liquor. Their job is chemical recovery as much as steam, and pellets are not a substitute for that duty.
• Lime kilns in integrated mills have their own fuel and temperature requirements and need separate assessment.

Many Gujarat mills that make kraft or writing paper from recycled fibre have no recovery boiler at all. Their steam is coal-based, which makes the conversation simpler.

Dryer Section Steam: Stability Matters More Than Peak Output

The paper machine dryer section wants steady pressure. Sudden drops show up as wet sheet, breaks and lost production, which cost more than the fuel itself. When you trial pellets, watch steam pressure trend charts more closely than fuel counts. Ask your operators whether the boiler holds set pressure during load changes such as a grade change or a restart after a break. Pellets feed differently from coal fines, so feeder speed and air settings usually need retuning with your boiler engineer.

Fuel Handling in a Mill Yard

Paper mills already deal with dust and fibre fire risk around reels and waste paper. Add a pellet store only after your safety team has reviewed location, ventilation and housekeeping. Keep pellets dry and covered; the BBI moisture specification is below 10%, and a wet yard undoes that. Our guide to pellet storage and handling covers the practical points. Pellets that crumble in handling create fines, so also read about pellet durability testing and ask what durability checks the supplier runs.

Ash and Water Chemistry Questions

BBI fuel is below 10% ash, typically 2 to 8% depending on feedstock, against generally 25 to 45% for Indian coal. Less ash by weight does not remove the need for planning. Ask which agro residue sits behind each batch, how the ash behaves in your furnace, and log ash removed per day during the trial. If your mill reuses boiler ash in any way, discuss that with your environmental team before assuming it is acceptable.

Questions to Put to a Supplier

1. Can you supply a batch lab report with each consignment for GCV, moisture, ash and sulphur?
2. What is the monthly volume you can hold, and what happens in a monsoon month?
3. How are pellets loaded, and can trucks unload on your weighbridge schedule?
4. Which feedstocks do you use, and will the mix change between batches?

Trial Plan for a Paper Mill

Pick the boiler with the clearest steam meter, order the 25 MT minimum, and run it for a few full production cycles including a grade change. Record steam per tonne of fuel, pressure stability, ash and any machine breaks linked to steam. For the mechanical review of grates and feeders, see the coal to biomass retrofitting guide, and run your own figures through the fuel cost calculator.