AgroFossilFree - Bioenergy II: Suitability of Wood Chips and Various Biomass Types for Use in Plant of BtL Production by Gasification

Allgemeine Beschreibung

A characterization study has been performed of the French regional resources that may be used in Biomass-to-Liquid plants based on gasification in entrained-flow reactor. It is based on about 90 representative samples of wood chips from forestry, Short Rotation Coppice (SRC) and Short Rotation Forestry (SRF) and of agricultural biomass, including straws and energy crops. Results show that there is not much variability in properties inside the different families. The majority of properties do not seem to be problematical for the process. However, some properties may be questionable: (i) wood chips size distribution, with many small particles ( below 2 mm) and very large particles (above 70 mm), (ii) bulk density, which is very low in agricultural products (about 100 kg.m-3), (iii) sulphur, fluorine and chlorine contents, which are high, especially chlorine in agricultural straws (1000-8000 mg/kg) (iv) other impurities amounts, such as Ni and B, which are in relatively high amounts in some samples (v) ash content, which is high in SRC/SRF (3 wmf%) and very high in most agricultural raw materials (5 wmf%). Based on these statements, first conclusions on the suitability between feedstock and process may be drawn. Wood chips from forestry appear as the most suitable resource for the process and should be the first resource to be used in industrial plants. SRC/SRF also seem quite suitable for the process and may be seen as a short-term alternative. Agricultural raw materials seem to be more problematical and may be seen as a mid-term option.