Emergy life cycle analysis of biomass valorisation systems
Description
Actually biomass-based energy supply is a promising route for renewable energy system and sustainable development strategy. Methane rich gas from biomass can be obtained from various routes, either gasification (Synthetic Natural Gas, SNG) or anaerobic digestion (biogas). SNG is very suitable, as it could be an important energy carrier. It could replace natural gas for electricity generation and heating systems and use the existing gas infrastructure. SNG can be produced via methanation of synthesis gas, which mainly contains H2, CO, CO2, H2O and traces of high hydrocarbons and aromatic compounds. The main objective of this work is to investigate the syngas methanation, and to compare the environmental performance and sustainability for different SNG production systems. The French system (valorization of forest residue) and the Tunisian system (valorization of date palm waste) are analyzed and compared by using the Energetic Life Cycle Assessment method. The inventory data are obtained mainly through process simulation by Aspen PlusTM software. The results show that increasing the steam ratio in syngas can avoid the carbon deposit during methanation process. The cold gas efficiency of the SNG process is 52%.The environmental analysis (via LCA methodology) results show that high greenhouse gas savings can be obtained for each system. However, the Tunisian system is the largest consumers of abiotic resources. The French system is characterized by large eutrophication and acidification potentials. The transformity of the French SNG is lower than the one of the Tunisian SNG. On the other hand, the Tunisian system has the highest percentage of renewability and index of sustainability. The environmental performance and the sustainability of the two systems can be made even more attractive by installing the SNG production units near forests or oasis. Overall, the SNG is expected to contribute favorably to the future renewable energy system. (author)
Abstract (French)
Dans un contexte de developpement durable, la maitrise de la consommation energetique mondiale fait partie des defis majeurs de ce siecle. Au regard de la croissance constante de la demande energetique mondiale et de l'epuisement des ressources fossiles et des problemes environnementaux engendres par la consommation de ces dernieres, le recours a des sources d'energie renouvelables demeure incontournable. La filiere biomasse parait, desormais, une voie prometteuse pour la production d'energie propre et durable. La production du Gaz Naturel Synthetique (SNG) a partir de biomasse lignocellulosique est en plein essor et atteint des degres de maturite pre-industriels interessants en termes de recherche et de developpement. L'objectif de ce travail est la comparaison, par le biais d'indicateurs de developpement durable, de systemes de production de SNG a partir des ressources agricoles et forestieres delaissees. Les deux systemes etudies valorisent les residus forestiers et les dechets des palmiers dattiers. L'Analyse de Cycle de Vie Emergetique a ete choisie comme l'outil le plus judicieux pour l'etude des systemes de production de SNG. Cet outil permet, d'une part, de comparer les systemes afin de determiner lequel est le plus efficace et le plus durable, et, d'autre part, de localiser leurs possibilites d'ameliorations environnementales. Les resultats obtenus montrent que l'augmentation de la teneur en eau dans le gaz de synthese peut eviter le depot de carbone au cours de processus de methanation. Le rendement 'Cold Gaz Efficiency' du procede SNG est de 52%. Les resultats de l'evaluation environnementale (via l'ACV) montrent de fortes reductions des gaz a effet de serre pour chaque systeme. Cependant, le systeme tunisien presente la plus grande consommation en ressources abiotiques alors que le systeme francais est caracterise par de forts pouvoirs d'eutrophisation et d'acidification. La transformite de SNG francais est inferieure a celle du SNG tunisien. Par ailleurs, le systeme tunisien a la plus grande valeur du pourcentage de renouvelabilite et d'indice de durabilite. Le profil environnemental et la durabilite des deux systemes etudies peuvent etre encore plus interessants en installant l'unite de production SNG a proximite d'oasis ou de forets. Dans l'ensemble, le SNG devrait contribuer favorablement a l'avenir du mix d'energie renouvelable. (auteur)
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Additional details
Additional titles
- Original title (French)
- Analyse de cycle de vie emergetique de systemes de valorisation de biomasse
Publishing Information
- Imprint Pagination
- 217 p.
- Report number
- FRNC-TH--10200
INIS
- Country of Publication
- France
- Country of Input or Organization
- France
- INIS RN
- 49089298
- Subject category
- S09: BIOMASS FUELS;
- Resource subtype / Literary indicator
- Thesis
- Descriptors DEI
- BIOMASS CONVERSION PLANTS; COMPUTERIZED SIMULATION; DESULFURIZATION; ENVIRONMENTAL IMPACTS; FLUIDIZED BED REFUSE GASIFICATION; LIFE CYCLE ASSESSMENT; METHANATION; SENSITIVITY ANALYSIS; SUSTAINABILITY; SYNTHESIS GAS; TUNISIA
- Descriptors DEC
- AFRICA; ARAB COUNTRIES; CHEMICAL REACTIONS; DEVELOPING COUNTRIES; FLUIDS; GASES; GASIFICATION; INDUSTRIAL PLANTS; MANAGEMENT; PROCESSING; SIMULATION; THERMOCHEMICAL PROCESSES; WASTE MANAGEMENT; WASTE PROCESSING
Optional Information
- Notes
- 185 refs.; Available from the INIS Liaison Officer for France, see the INIS website for current contact and E-mail addresses