Gasification of Fermentation Residue in a Fluid Gasifier

Abstract

Biogas production in an anaerobic way in biogas stations is currently prevalent in the Czech Republic. Along with the increasing installed capacity of biogas stations and the amount of gas produced, the need for handling the solid residue of this process – digestate – is increasing. The digestate from pure input raw materials is most often used as a fertiliser; however, the regulations limit its use, and this output from biogas stations is a surplus. Digestate from biogas stations, where bio-waste is used as fuel, is unsuitable for fertilising. Other thermochemical processes such as incineration, gasification, and pyrolysis cannot be overlooked when looking for other technologies to use this solid organic matter. The article summarises the experience of transforming dry digestate into gaseous fuel utilising a static fluidised bed gasification generator. The article contains fuel analyses, a description of the experiments carried out, and the results of the composition of the final product – gas.