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Conversion of olive tree pruning in fluidized bed: Experiments and gasifier modeling

Conversion of olive tree pruning in fluidized bed: Experiments and gasifier modeling. Susanna Nilsson 1 , Alberto Gómez-Barea 1 , Manuel Campoy 1 , Guadalupe Pinna 2 , Manuel Antonio Silva Perez 2 , Pedro Ollero 1 1 Chemical and Environmental Engineering Department.

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Conversion of olive tree pruning in fluidized bed: Experiments and gasifier modeling

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  1. Conversion of olive tree pruning in fluidized bed: Experiments and gasifier modeling Susanna Nilsson1, Alberto Gómez-Barea1, Manuel Campoy1, Guadalupe Pinna2, Manuel Antonio Silva Perez2, Pedro Ollero1 1Chemical and Environmental Engineering Department. Escuela Superior de Ingenieros (University of Seville) Camino de los Descubrimientos S/N. 41092,Seville (Spain) 2 Foundation Advanced Technological Centre for Renewable Energy (CTAER) Paraje los Retamares S/N. 04200, Tabernas -Almería (Spain) Objective The aim of this work is to assess the performance of a fluidized bed gasifier (FBG) using olive tree pruning (OTP) as fuel by: • Devolatilization and char gasification experiments carried out in a laboratory fluidized bed (FB) • Modeling of a FBG operating with OTP as fuel Experimental conditions • Fluidizing gas • Devolatilization: 100% N2 • CO2 gasification: N2-CO2 mixtures with varying CO2 concentration • H2O gasification: N2-H2O–H2 mixtures with varying H2O and H2 concentration • Temperature: 750-900 ºC • Atmospheric pressure • Bed material: Bauxite, 250-500 µm • Particle size: 1-20 mm Devolatilization results Light gas composition: Product yields: Particle size variation: Model description Submodels: Model structure: Model input: • Fuel composition: proximate and elemental analysis and HHV • Gasifier geometry: diameter and height of the bed and freeboard • Fuel feed rate • Air flow rate • Devolatilization yields as a function of temperature • Char gasification kinetics • Fluid dynamics • Dense bed zone • Freeboard zone • Particle attrition and fragmentation • Char conversion Model results Optimal operating temperature: Conclusions: The influence of the following parameters has been studied: • Equivalence ratio (the gasifier is assumed autothermal) • Preheating of the fluidizing gas • Composition of the fluidizing gas • Fuel ash content • Fuel moisture content • Fuel HHV • Optimal operating temperature is close to 900 ºC • The composition of the fuel is very important: small variations of the moisture content, ash content or HHV influence significantly the gasification efficiency and gas quality. • The char conversion is mainly influenced by the gasification temperature, being the gas composition a secondary factor Cold gas efficiency ,% Temperature, ºC

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