Jan 01 1996 · All electric efficiencies are close to or above 30% (at lower heating value). Of the plants fired solely by biomass vibrating grates and circulating fluidised beds turn out to have the highest efficiency at the moment. Co-firing of 4.5% biomass in a pulverised coal boiler
Grate boilers are widely used as active steam generation units in Finnish pulp and paper mills to control the steam network of the plant. The fuels burned on grates are typically bark and waste-wood.