FUENTES CANO , Diego Javier

La gasificación autotérmica de biomasa y residuos en lecho fluido para generación eléctrica distribuida presenta notables ventajas respecto a otras opciones. No obstante esta tecnología presenta ciertas limitaciones que frenan su implantación comercial: la limitada conversión del combustible, debida a la incompleta conversión del carbonizado, y...

A comprehensive tar conversion model for biomass gasification has not been developed up to date due to the great deal of processes involved, whose stoichiometry and kinetics are not well known. Therefore, simplified schemes of reactions are assumed in existing models, reducing their capability to predict the tar composition in the gas. In this...

Even when European regulation has been encouraging landfill reduction in the last decades, 13 out of 28 EU countries still landfill more than 50% of their municipal solid waste (MSW), mainly located in Southern and Eastern Europe. In this paper, waste-to-energy (WtE) schemes based on gasification are proposed in order to minimize the landfill...

Olive tree pruning was gasified in a laboratory fluidized bed reactor using air as gasifying agent. Different operating temperatures (800, 850 and 900 ºC) and equivalence ratios (ER) (0.12-0.35) were tested and additional tests were performed varying the particle size of the fuel, the biomass feed rate and the oxygen content in the air...

Fluidized bed gasification is a promising technology for the energetic valorization of biomass and wastes. However the presence of heavy tars limits the use of the gas to applications where the gas is not cooled. Several parameters such as the temperature profile inside the gasifier and the gas residence time influence the concentration and...

Kinetics of gasification of char obtained from dried sewage sludge (DSS) with steam and CO2 have been measured in a laboratory fluidized bed (FB) reactor at temperatures between 800 and 950 ºC with steam and CO2 . Char was generated in situ in N2 atmosphere, which is important since cooling of char significantly influences its reactivity. The...

Kinetics of gasification of char obtained from dried sewage sludge (DSS) with steam and CO2 have been measured in a laboratory fluidized bed (FB) reactor at temperatures between 800 and 950 ºC with steam and CO2. Char was generated in situ in N2 atmosphere, which is important since cooling of char significantly influences its reactivity. The...

A new gasification concept for biomass/waste gasification for electricity production for small/medium application has been developed. The gasification system is aimed at improving the two major drawbacks in fluidized beds (FB), i.e. the low char conversion and the high tar content in the gas. The system comprises a FB devolatilizer, an...

A new concept to remove tar by scrubbing from biomass gasification gas is investigated. The concept is based on a system capable to remove the tars in two sequential stages: heavy tars are removed in a first hot absorber and the light tars (and water) are removed in a second, colder, absorber. The liquid stream contain light tars is...

The effect of temperature and steam concentration on the yields of different tar compounds was investigated. Wood pellets and dried sewage sludge spheres (DSS) were pyrolyzed in a fluidized bed reactor in the temperature range of 500-800ºC. The reactor has two independent electrically heated zones, enabling independent adjustment of the...

The catalytic conversion of biomass-derived tars over char during long tests (over 6 h) is studied. The syngas is generated in a steam-blown fluidized-bed gasifier employing wood pellets and conducted to a second tubular reactor where non-activated char particles are fluidized. The gasifier operated at 750 °C whereas the temperature of the...

A technical assessment of gasification of various wastes in fluidized bed was made by conducting test in a 100 kWth pilot plant. The reactor was operated under simulated autothermal and adiabatic conditions, thus allowing scaling-up the results to industrial units. Four feed stocks were tested: orujillo, meat and bone meal, dried sewage sludge...

The thermal conversion of the sewage sludge by pyrolysis, gasification and combustion can be an attractive alternative because it reduces the volume of the residue and improve its properties for safe disposal. However, the high content of some heavy metals in sewage sludge has to be carefully considered to come up with rational and sustainable...

Devolatilization of two agricultural residues; corn stover and a solid by-product from enzymatic hydrolysis of biomass (cake), was carried out in a fluidized bed at temperatures between 750 and 900 ºC. The distribution of products and composition of the light gas were determined using N2 as fluidizing gas and the effect of the fluidizing agent...

An assessment of the revamping of a 3 MWth atmospheric­pressure bubbling fluidized bed biomass gasifier was made in order to study the techno­economical viability of changing the gasifying agent from air to a mixture of enriched air based on membrane technology (up to 40% in volume oxygen) and low­pressure saturated steam. The expected changes...

There is a growing concern on the final disposal of urban organic wastes, such as municipal solid waste (MSW) and sewage sludge (SS), since they constitute an available energy and material source currently not efficiently valorized. These wastes become an attractive feedstock provided proper treatment/conversion techniques are applied, dealing...

Kinetics of gasification of char from olive tree pruning was measured in a fluidized bed at temperatures between 760 and 900 ºC. Experiments were carried out using H2O­N2 and CO2­N2 mixtures to measure the rates of the gasification reactions with H2O and CO2 and to assess the inhibition effects of H2 and CO. The reaction rates with H2O were 3­4...