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In this study, biomass devolatilization, which is the initial stage of steam gasification, was experimentally investigated in a 100kW dual fluidised bed gasifier. In the experiments, pellets of radiata pine sawdust were used as the feedstock, and silica sand was used as the bed material. The operating temperature in the gasifier was varied from 700 to 800°C and N2 was used as the fluidisation agent...
Biomass gasification is an effective way to produce syngas that must be conditioned to remove the main pollutants (tars) for its use in energy production systems. Catalytic steam reforming of tar and CH4 is thus necessary; Nickel catalysts are excellent candidates but still have deactivation problems related to carbon deposition and sulphur poisoning. Various studies demonstrated that Mayenite as...
The challenges of future regarding the energy supply are linked to the limitation of fossil fuels, the avoidance of climatic relevant gases, and the worldwide increasing demand for energy. Therefore, the future energy supply is characterized by the increase of renewable energy: sun, water, wind and biomass. Entrained flow gasification of biomass is promising, since it is a highly efficient and flexible...
This study pursues the development and characterization of a fountain enhanced spouting regime. This novel gas solid-contact method combines the advantages of fountain confined conical spouted beds with those of draft tube conical spouted beds. The aim of confining the fountain, and therefore attaining a clearly differentiated regime, is to progress towards a highly efficient conical spouted bed reactor...
The gas conditioning, purification, and module adjustment are crucial steps in the preparation of an optimal synthesis gas composition for a wide range of syngas conversion processes and catalysts. These are all areas where Haldor Topsoe A/S has been active since the establishment of the company in 1940. With an industrial perspective on large-scale biomass gasification, syngas conditioning and clean-up,...
The aim of this work is to study the tars conversion in conditions representative of biomass gasification in a fluidized bed reactor. Experiments are conducted at 850°C and atmospheric pressure in a fluidized bed reactor with toluene as tar model. Influences of the nature of the media (sand and olivine) and of the reactive atmosphere (steam and hydrogen partial pressures) on toluene conversion are...
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