Biomass Briquettes vs Pellets: Specifications and Boiler Suitability

Biomass briquettes and biomass pellets are both manufactured from compressed agricultural waste and are both solid fuels that can replace coal or furnace oil where the equipment allows. But they serve different industrial applications, have different combustion profiles, and suit different boiler types. Here is a practical comparison to help you choose.

Physical Differences

The most obvious difference is size and shape. BBI biomass pellets are small cylinders (6mm or 8mm diameter, 15–40mm length) manufactured in ring-die pellet presses at very high pressures. BBI biomass briquettes are much larger cylinders (90mm diameter, 150–300mm length) produced in hydraulic or mechanical piston presses at lower pressures.

This size difference has significant implications for storage, handling, and boiler compatibility.

Product Specifications and Handling

When to Choose Briquettes

Briquettes may be assessed where:

• The grate, hopper and fuel-feeding equipment can safely accept the briquette dimensions.
• The boiler or furnace OEM confirms the fuel is suitable for the equipment and operating conditions.
• A monitored trial supports the required heat output, ash handling and cost assumptions.

When to Choose Pellets

Pellets may be assessed where:

• The fuel-feeding system is designed or approved to handle the pellet size and properties.
• A power plant has specified a suitable pellet for its own co-firing requirements.
• A monitored trial confirms that the fuel and equipment meet the site's process requirements.

BBI's Recommendation

Briquettes and pellets have different dimensions and handling requirements, so a buyer may assess them for different equipment at the same site. Bharat Bio Industries is based in Kadi, Gujarat. Confirm product availability, order quantity and delivery arrangements with our team.

Start from the Boiler, Not the Brochure

The table above gives the headline differences. In practice, the decision turns on what your fuel feeding system can physically accept. A pneumatic or screw feeder built for small cylinders will choke on 90 mm briquettes, while a hand-fired or chute-fed grate may waste the advantage of a pellet. Walk to the boiler and note how fuel actually enters the furnace before comparing a single price.

Checks at the feeding end

• Hopper opening and screw or chain size: can it pass a piece that is 90 mm across without bridging?
• Whether fuel is dropped by gravity, thrown by a spreader or pushed by a ram, since each handles breakage differently.
• The distance and bends in the conveying line, because long runs grind pellets into fines.

Handling Losses You Will Not See on a Spec Sheet

Handling can produce chips or fines, depending on the product and transfer system. Record the condition of a representative delivered sample and, where useful, compare it with a sample taken after the site's normal handling route. The durability guide explains how to compare pellet test results.

Storage and Labour

1. Briquettes stack in neat, large pieces and are easier to inspect by eye; pellets pour and fill a silo or bunker more compactly.
2. Pellets suit automated bulk handling; briquettes often mean manual loading, which affects shift labour.
3. Both absorb moisture, so covered, off-ground storage applies to either one; see storage and handling.

What a Side-by-Side Trial Looks Like

If you cannot decide on paper, run one fuel at a time on the same boiler with the same operators. Buy the 25 MT minimum of each, run each for an equal period at comparable load, and keep a simple log:

• Steam generated per tonne of fuel fed.
• Feeder stoppages and manual interventions per shift.
• Ash and clinker removed, and how the grate looked at end of shift.
• Fines screened from a standard sample of bags.

Compare the logs with the batch lab report for each lot rather than relying on memory. Your heat requirement stays the same; the better product is the one that delivers it with the fewest interruptions at your delivered price. Use the calculator with real prices, and read what GCV means if you need to convert between as-received and dry figures.

Mixed Use Across One Plant

Many sites have different boilers and furnaces under one roof, a main steam boiler with a stoker and a smaller thermic fluid heater or kiln that is hand-fed. It is entirely reasonable to specify different forms for each, provided each lot is checked against its own lab report. Keep stock areas labelled separately so a briquette feeder is never loaded with pellets by mistake. For a wider look at how fuel economics compare with coal, see biomass pellets vs coal.