Roasting biomass is as efficient as coal
The Association of Energy Recovery from Biomass (Avebiom), as representative of World Bioenergy in Spain and at Bioenergy Fair to be held from 25 to 27 May in Jönköping (Sweden), continues to meet some of the innovations presented at the meeting. In this case it is a new roasting technology making wood biomass power plants as efficient as coal.
At the World Bioenergy congress and exhibition in Jönköping, a Swedish company, AB Torkapparater, will present its new technology for drying and roasting of green biomass, which allows conversion into a product similar to coal and replacing it in power plants.
The process involves drying wood in an oxygen-free atmosphere at a temperature of 300 º C, resulting in a material similar to coal. The increased efficiency and lower energy consumption of this technology is achieved by tar and other substances that contain flammable gases used as fuel originated within the process itself, limiting the additional amount of external power required.
Avebiom says that further roasting increases the energy density of the original biomass, which can carry much more energy. “Anyone who has studied the life cycle of a product knows that transport is one of the most important aspects to consider both the economic cost and environmental effects. “For this reason, they think that “savings in logistics is a major incentive in the investigation of roasting technology.”
More efficient technologies -Torkapparater
Tests so far show that responds well roasted fuel power plants in operation and requires less energy for grinding the regular wood pellets. Earlier this year the company expects to launch an industrial scale pilot plant to study and develop the process until the last detail.
Not this the only technology from Torkapparater as known at World Bioenergy. In Avebiom remember that they also present other drying plant, which was launched in late 2009 by the Swedish manufacturer of pellet in Älvdalen. There a drying process in two stages that includes a band and a trommel is used. The heat from the trommel is recovered in the band system, which leads to a reduction in energy consumption by 30%. On the other hand, the same firm working on other techniques for producing energy-efficient biofuels through pyrolysis and gasification.
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