{"id":{"repo_id":"aachen","oai_identifier":"oai:publications.rwth-aachen.de:50221"},"canonical_url":"https://search.dev.ndltd.org/etd/aachen/oai:publications.rwth-aachen.de:50221","repository":{"repo_id":"aachen","name":"RWTH Aachen University","base_url":"https://publications.rwth-aachen.de/oai2d"},"display":{"title":"Freisetzung anorganischer Spezies bei der thermochemischen Umwandlung biogener Festbrennstoffe","abstract":"The thermochemical use of solid biomass will be important for the energy production in the future. If possible, all types of biomass, e.g. wood and residues of cereal production should be used. Integrated Gasification Combined Cycle (IGCC) seems to be a promising concept with efficiencies > 55%, in which the product gas can be used for electrical power generation and heat production or for the production of synthesis gas. High amounts of alkali, sulphur, and chlorine compounds in the flue gas can be problematic. These pollutants can cause slagging and fouling in the boiler, catalyst deactivation or high temperature corrosion of iron materials and nickel-base alloys. In order to develop technical measures to reduce the amount of alkalis, sulphur and chlorine in the flue gas, an increased understanding of the release behaviour of these pollutants during thermochemical conversion of biomass is necessary. In the present work, the influence of fuel composition, temperature, and oxygen/fuel ratio on the release of trace elements during combustion and gasification of woody and herbaceous biomass was investigated. Therefore experiments were performed in a tube furnace and in a lab scale fluidized bed reactor. The experiments were supplemented by thermodynamic equilibrium calculations and a thermochemical model of the Värnamo gasifier. The fuel ashes were investigated chemically, by XRD, STA, and Knudsen Effusion Mass Spectrometry (KEMS). Molecular Beam Mass Spectrometry (MBMS) was used for the semi-quantitative analysis of the hot flue gas. This work provides important insights into the influence of fuel composition, ash phases, temperature, and oxygen/fuel ratio on the release of inorganic pollutants.","abstract_html":"The thermochemical use of solid biomass will be important for the energy production in the future. If possible, all types of biomass, e.g. wood and residues of cereal production should be used. Integrated Gasification Combined Cycle (IGCC) seems to be a promising concept with efficiencies > 55%, in which the product gas can be used for electrical power generation and heat production or for the production of synthesis gas. High amounts of alkali, sulphur, and chlorine compounds in the flue gas can be problematic. These pollutants can cause slagging and fouling in the boiler, catalyst deactivation or high temperature corrosion of iron materials and nickel-base alloys. In order to develop technical measures to reduce the amount of alkalis, sulphur and chlorine in the flue gas, an increased understanding of the release behaviour of these pollutants during thermochemical conversion of biomass is necessary. In the present work, the influence of fuel composition, temperature, and oxygen/fuel ratio on the release of trace elements during combustion and gasification of woody and herbaceous biomass was investigated. Therefore experiments were performed in a tube furnace and in a lab scale fluidized bed reactor. The experiments were supplemented by thermodynamic equilibrium calculations and a thermochemical model of the Värnamo gasifier. The fuel ashes were investigated chemically, by XRD, STA, and Knudsen Effusion Mass Spectrometry (KEMS). Molecular Beam Mass Spectrometry (MBMS) was used for the semi-quantitative analysis of the hot flue gas. 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If possible, all types of biomass, e.g. wood and residues of cereal production should be used. Integrated Gasification Combined Cycle (IGCC) seems to be a promising concept with efficiencies > 55%, in which the product gas can be used for electrical power generation and heat production or for the production of synthesis gas. High amounts of alkali, sulphur, and chlorine compounds in the flue gas can be problematic. These pollutants can cause slagging and fouling in the boiler, catalyst deactivation or high temperature corrosion of iron materials and nickel-base alloys. In order to develop technical measures to reduce the amount of alkalis, sulphur and chlorine in the flue gas, an increased understanding of the release behaviour of these pollutants during thermochemical conversion of biomass is necessary. In the present work, the influence of fuel composition, temperature, and oxygen/fuel ratio on the release of trace elements during combustion and gasification of woody and herbaceous biomass was investigated. Therefore experiments were performed in a tube furnace and in a lab scale fluidized bed reactor. The experiments were supplemented by thermodynamic equilibrium calculations and a thermochemical model of the Värnamo gasifier. The fuel ashes were investigated chemically, by XRD, STA, and Knudsen Effusion Mass Spectrometry (KEMS). Molecular Beam Mass Spectrometry (MBMS) was used for the semi-quantitative analysis of the hot flue gas. This work provides important insights into the influence of fuel composition, ash phases, temperature, and oxygen/fuel ratio on the release of inorganic pollutants."]},{"key":"dc:source","label":"Dc Source","values":["Aachen : Publikationsserver der RWTH Aachen University X, 134 S. : Ill., graph. Darst. (2008). = Aachen, Techn. 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