期刊
ENERGIES
卷 14, 期 24, 页码 -出版社
MDPI
DOI: 10.3390/en14248229
关键词
trace elements; hydrothermal carbonization; biomass; emissions; combustion
资金
- BMBF, Bundesministerium fuer Bildung und Forschung [01DN16036]
The study showed that hydrothermal treatment of short-rotation coppice willow biomass improved its combustion properties and significantly reduced the ash content, meeting the requirements of the European biomass pellet standard.
The worldwide transformation from fossil fuels to sustainable energy sources will increase the demand for biomass. However, the ash content of many available biomass sources exceeds the limits of national standards. In this study, short-rotation coppice willow biomass was hydrothermally treated at 150, 170 and 185 & DEG;C. The higher heating value increased by 2.6% from x over bar = 19,279 J x g(-1) to x over bar = 19,793 J x g(-1) at 185 & DEG;C treatment temperature. The mean ash content was reduced by 53% from x over bar = 1.97% to x over bar = 0.93% at 170 & DEG;C treatment temperature, which was below the limit for category TW1b of the European pellet standard for thermally treated biomass. The nitrogen, sulfur and cadmium concentrations were reduced below the limits for category TW1b of the European biomass pellet standard (N: from 0.52% to 0.34%, limit at 0.5%; S: from 0.051% to 0.024%, limit at 0.04%; Cd: from 0.83 mg x kg(-1) to 0.37 mg x kg(-1), limit at 0.5 mg x kg(-1)). The highest reduction rates were sampled for phosphor (80-84%), potassium (78-90%), chlorine (96-98%) and lithium (96-98%). The reduction behavior of the elements is discussed according to the chemical processes at the onset of hydrothermal carbonization. The results of this study show that HTT has the potential to expand the availability of biomass for the increasing worldwide demand in the future.
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