Influence of Ca(OH)2 on ash melting behaviour of woody biomass

• Published in: Carbon resources conversion 2021, Vol.4, p.84-88
• Main Authors: Hrbek, J., Oberndorfer, C., Zanzinger, P., Pfeifer, C.
• Format: Article
• Language: English
• Subjects: Additives; Ash melting behaviour; Biomass; Thermochemical conversion
• ISSN: 2588-9133; 2588-9133
• DOI: 10.1016/j.crcon.2021.01.008

[Display omitted] •The impact of Ca(OH)2 on ash melting behaviour of spruce and poplar wood ash.•Influence of additive on ash melting temperature only in case of spruce wood obvious.•Ca(OH)2 can be used to minimize degradation process in outdoor stored biomass.•No negative effect of Ca(OH)2 on conversion processes in fluidized bed approved. Woody biomass is a renewable source offering high potential for production of bio-fuels, -chemicals and -energy. During the outdoor storage of biomass biodegradation processes take place, which leads to mass reduction up to 30 wt%. To avoid these mass losses, the biomass was mixed with Ca(OH)2 in different ratios. To ensure, that this additive does not negatively influence further thermo-chemical conversion of biomass (e.g. by fluidized bed combustion), the spruce and poplar ash with and without additive was tested using ash melting microscopy. It was demonstrated that all the characteristic temperatures (DT, HT, FT) were significantly higher than the thermo-chemical conversion process temperatures in a fluidized bed. Thus it could be pointed out that the addition of Ca(OH)2 does not negatively influence ash melting behaviour, ash melting temperature respectively.