Analysis of input biomass parameter impact on electric capacity factor of biogas plants
2025
Plume, Lauris | Plume, Imants
Factor of utilisation of electric power or electric capacity factor (CF) is low in agricultural biogas plants in Latvia due to low input biomass quality and/or biogas plants management practices. Different parameters of the silage in input biomass and in digestate output were analysed using statistical methods for 15 agricultural biogas plants in Latvia. Samples of silage were obtained from operating biogas plants and were analysed in certified laboratory. Multivariate statistical modelling of the factors was carried out to find determinants of the CF. Results of modelling showed that most important factors influencing CF value was ash percentage in silage (ASH) and proportion of silage (SIL) in input biomass of biogas plants explaining 34.7% of the variations in CF of the biogas plants with maximum probability 92.2 %.The comparison of two subgroups of biogas plants differing in total solids (TS) content in input silage with the first subgroup including biogas plants with silage TS content higher than 29.9 % and the second subgroup with silage TS content below 29.9 %, showed significant differences in mean CF values 0.812 or 0.645 (difference 20.6 %) in first or second subgroups, respectively, with probability above 95%. Recommendations are to maintain the TS content of silage above 29.9 % and to reduce biodegradation of silage during storage, for example by covering silage heaps with oxygen-proof plastic film and reducing the opening time of heaps during removal of silage.
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Editeur Latvia University of Life Sciences and Technologies
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