ENERGY VALORIZATION OF GRASSES BY DRY PROCESS

Ahmed Wahrani Khirech (1) , J.F. Largeau (2, 3) , Mohand Tazerout (3, 4)

1 ICAM - Institut Catholique d'Arts et Métiers
2 GEPEA - Laboratoire de génie des procédés - environnement - agroalimentaire
3 IMT Atlantique - DSEE - Département Systèmes Energétiques et Environnement
4 GEPEA-VERTE - Valorisation Energie-matière des Résidus et Traitement des Emissions

Background: Currently grasses in Europe, are not valorised in energetic point of view (as fuel). They are mainly abandoned on the ground or used for compost. In all cases, without treatment, internal moisture of grass will quickly start the fermentation and decomposes carbon molecules (48h are enough). The aim of this work is to explore in one hand, technical solutions for conditioning grasses (energy storage) and other hand, processes in order to convert this biomass energy into fuel by dry way (pyrolysis/gasification). Even if grasses are an abundant resources, all this conversion chain must be also economically acceptable. Materials/Methods: The energetic potential of garden grasses was evaluated (moisture, ashes rate, lower heating value, elementary chemistry (CHNS)). Different approaches were study to decrease the moisture level in order to obtain a good stabilization of the grasses biomass and to obtain something compliant with energy storage or pyrolysis/gasification processes. The thermo-kinetic decomposition behaviour was studied with TGA and DSC analysis methods in order to determined kinetic parameters: activation energy and pre-exponential factor (Kissinger and Flynn/Wall/Ozawa). Results:

Domaines: Génie des procédés

Ahmed Wahrani Khirech, J.F. Largeau, Mohand Tazerout. ENERGY VALORIZATION OF GRASSES BY DRY PROCESS. WasteEng - Conference on Engineering for Waste and Biomass Valorisation, Jul 2018, prague, Czech Republic. ⟨hal-01927075⟩