Winter 2018 Edition
A new technology developed in the USA from ROI Equipment can be an interesting solution in Norway for increased material recovery from surplus biomass.
Return active in the construction industry is something that must be collected in large quantities at the recycling stations throughout the country. As of today this resource is one of the cheapest raw materials and resold as fuel chips for district heating plants in Norway and Sweden.
The new EU waste directive that has come into effect and will be applicable in Norway, requires an increased effort for recycling versus energy recovery. This means that the wood waste to a greater extent being made into new products, for example. chipboard or wooden boxes.
Production of biochar combined with bioenergy production can be a step toward increasing material in the sense that biochar used as an ingredient in new products (eg. Garden soil, plant soil, biofilter). We got in touch with ROI-Equipment to hear more about their technology that is adapted to the conversion of demolition wood.
The machine is built with a powerful Caterpillar motor. The machine receives demolition wood and garden waste without splintering and loaded directly into the primary combustion chamber by means of a tractor or construction machine with clamp forceps. Here saves on processing and pre-drying of wood chips at the cache and tile panel. The fuel is ignited by a side drain, and powerful air supplied over the biomass ensures nearly complete combustion of the exhaust gases. At the bottom there is a screw leading biochar out of the container.
On the way out, there is a powerful magnet that separates out nails and other metal objects that come with demolition wood. The disadvantage of this technology is that the heat is not exploited to any great extent. It is unlikely that one will find a nearby heat demand where biomass finds himself (in the forest, or the recycling center). Therefore, the business model based on a scenario in which it pays to reduce transport costs linked to the relocation of the demolition wood, and where there is a paying market for biochar produced.
Biomass In vs. Biochar Out
The machine can process 15-20+ tons / hr and can expect to get out ca. 7% yield biochar. There is a relatively low yield per cent compared with other pyrolysis technologies but will still make a big volume biochar considering how much biomass can be fed through the machine once every hour.
ROI reports that biochar from wood which has been tested in the laboratory show Fixed-C content of between 75-85%, pH 7-10, specific surface area 360 m2 / g. Moisture in biochar can be controlled for different needs between 10 to 70%.