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Method of choosing optimal composition of biomass mixtures

Katelbach-Woźniak A., Niestrój M., Szlęk A.

Archivum Combustionis

2014

Vol. 34 nr 1

27—34

Biomass has high content of volatile matter, hence devolatilization process is rapid. Necessity of supplying high fluxes of combustion air is usually one of the factor which leads to high values of air excess ratio and, as a consequence to decrease of energy efficiency. However it is possible to use mixture of different sorts of biomasses and thus obtain fuel which might equalize devolatilization rate. In this paper procedure for choosing optimal mixture of given sorts of biomasses based on their composition is presented. First, pyrolysis process of hemicellulose, cellulose and lignin was conducted using thermobalance. Based on the results and assuming that there are no interactions between pure components, optimal composition of the mixture were calculated. In the next step, according to obtained optimal composition, proportions of oak, pine, rape straw and wheat straw were calculated. Finally, pyrolysis of selected biomass mixtures was carried out. It was found that due to the presence of cellulose, which decomposes in very narrow temperature range, all of mixtures are characterized by the devolatilization with local maximum occurring at the temperature around 350°C.

Investigation of biomass mixture devolatilization process

Bibrzycki J., Katelbach-Woźniak A., Niestrój M., Szlęk A.

Archivum Combustionis

2013

Vol. 33 nr 3

155--167

In this paper, pyrolysis of selected biomass types and their mixtures was investigated using thermogravimetric analyzer (TGA). The purpose of the work was to study interactions between components of biomass mixtures and influence of ash composition on pyrolysis up to 600°C, using two heating rates 1 K/min and 10 K/min. Five different biomass samples were taken into consideration: oak, pine, wheat straw, rape straw and energy crop (willow). It was found, that during slow pyrolysis (1 K/min) the volatiles yield increased and interactions were more noticeable. Results showed that increasing content of some components, like wheat straw, willow, in some biomass mixtures may favor occurrence of interactions. It was also found, that increasing heating rate accelerates devolatilization process and shifts extreme of DTG to higher temperature. Authors attempted to present volatiles yield, in a given temperature range, as a linear function of elemental composition of biomass.