Abstract
AbstractDuring gasification and/or pyrolysis of wooden biomass, charcoal is formed as a solid intermediate or product. In CO2‐ and H2O‐rich atmospheres at high temperatures, a high specific surface area of several 100 m2 per gram of charcoal may be reached. Common biomass gasifiers aim at a charcoal conversion of 100 %. Up to now, the option of a subsequent usage of the charcoal for adsorption of tar compounds has rarely been considered but is an interesting option to produce a clean syngas in a downstream adsorption unit. Experimental studies show an adsorption capacity of up to 0.4 g of tar per gram of charcoal using naphthalene as a model substance for tar. Respective adsorption isotherms, breakthrough curves in a fixed‐bed adsorber, and a kinetic breakthrough model are presented.
Highlights
The charcoals were produced from wood pellets by pyrolysis
Naphthalene was used as a model substance for various tar species
Thermal gasification of biomass is an attractive technology for the sustainable conversion to syngas
Summary
Thermal gasification of biomass is an attractive technology for the sustainable conversion to syngas (fuel gas). The raw gas frequently contains high amounts of mostly aromatic hydrocarbons, formed during the pyrolysis of the biogenic feedstock These compounds have to be separated from the crude syngas before its use, e.g., in a chemical synthesis such as Fischer-Tropsch or methanol synthesis or as fuel gas in an electricity and/or cogeneration unit. The adsorption experiments and modeling results presented in this work were part of a research and development (R&D) project for a new approach to biomass gasification. This process aims at the production of a clean syngas by using a concurrent moving-bed gasification reactor combined with a gas cleanup in a subsequent cooled adsorption section. The overall process and further information of this specific gasification process are given in a previous publication [1] and a respective patent [2]
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