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Steam exploded black pellets

“Black pellets” is the generic name for a range thermally-treated biofuel pellets intended for substitution of fossil-origin material in heat and power production. Woody biomass or agricultural residues can be processed into black pellets via various methods, including hydrothermal carbonization, torrefaction (mild pyrolysis) and steam explosion.

Black pellets characteristics, such as durability, moisture resistance, grindability, heating value and (bulk) density vary, depending on which method is used for thermal treatment.

The steam explosion process, compared to torrefaction or hydrothermal carbonization, produces very durable pellets with good moisture resistance. Steam explosion gives improvement in heating value of the pellets but, more importantly, the process yield is high which means low loss of biomaterial during processing.

Valmet’s BioTrac system may be applied in the production of black pellets as well. A BioTrac steam explosion process is easily integrated to existing pulp mill or CHP-plants (Combined Heat and Power plants) thereby offering low energy use and unsurpassed environmental performance.

 

Introducing Valmet black pellet plant

Introducing Valmet black pellet plant

The primary use of black pellets is to replace fossil coal in power plants. It is safer, more cost-efficient and delivers more energy than white pellets. The carbon emission reductions compared to traditional fossil fuels are significant. Valmet can deliver a complete production plant, from biomass infeed to black pellets out.

Black pellets - A replacement for fossil coal in power plants

Black pellets - A replacement for fossil coal in power plants

Steam exploded black pellets are a renewable biomass fuel that is safer and more cost-effective than conventional “white” biomass pellets, yet deliver more energy. The Valmet black pellet plant is a complete production facility with an integrated CHP plant, from biomass infeed to black pellet outfeed. Valmet also offers revamps of existing white pellet plants.