Objectif The roasting of wood on an industrial scale and the upgrading of the pilot plant from 60 litres to 10 m3. The plant will produce 15,000 T/y of roasted wood (7,800 TOE/y) which is dried at a scale between dry wood and charcoal.The project may be regarded as a technical success, although several difficulties were encountered during the initial phase:- the wood chipper gives chips whose dimensions do not correspond satisfactorily to the specifications. In particular, too much fines are produced- the wood chips dryer was under-designed. It was modified by adding one supplementary burner and by increasing the dryer length by about 50 %- the roasting reactor, heart of the process, has not led to any problem. However, the exhaust gas may not be used directly in the dryer because it is too dirty (dust and tars close to the dew point ). This gas is burned immediately after leaving the roasting reactor in a special incinerator and the diluted flue gas from the incinerator is used to complement the drying of wood chips in the dryer. The economic viability is not satisfactory for the demonstration project, due notably to higher investment costs than foreseen, induced by the difficulties mentioned above. However, the economic viability would be secured for replicated projects.The product has proven very satisfactory for its electrometallurgy application. For the barbecue market, the prospects are also interesting. Compared to charcoal, the roasted wood is easy to light, not so crumbly and not so dirty, and does not take moisture back.This plant has been built with a shredder and band dryer, a 10 m3 roaster, followed by a cooler. The roaster is a 'double envelope' horizontal mixer. Boiler heated hot fluid allows fine temperature control and is circulated within the envelope and stirrer.The plant is of sufficient capacity to treat 32,000 Ton/yr of wood ( with 40 % moisture content) to produce 15,000 Ton/yr of roasted wood (7,800 Toe/yr) with 5,200 Kcal/kg. Wood is dried and roasted between 220 C and 280 C, with ultimate specifications of the product depending only on temperature treatment. Roasted wood is used as a reducing agent (for chemical, silicium industry) and may also be used as a domestic fuel, for boilers and barbecues. Grillwood is the registered trade mark for this last use.This plant is being constructed in south-west France where wood is an important resource.Pyrolysis gas produced in the roaster is used for wood chips drying. Programme(s) ENG-ENALT 2C - Programme (EEC) of demonstration projects relating to the exploitation of alternative energy sources and to energy saving and the substitution of hydrocarbons, 1983-1985 Thème(s) 1.2 - GAS AND CHARCOAL FROM GASIFICATION AND PYROLYSIS Appel à propositions Data not available Régime de financement DEM - Demonstration contracts Coordinateur LE BOIS TORREFIE DU LOT Contribution de l’UE Aucune donnée Adresse LAVAL-DE-CERE 46130 BRETENOUX France Voir sur la carte Coût total Aucune donnée
