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CPOTE2020 logo
6th International Conference on
Contemporary Problems of Thermal Engineering
Online | 21-24 September 2020

Abstract CPOTE2020-1029-A

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The effects of hydrothermal carbonization operating parameters on the high-value hydrochar derived from beet pulp

Małgorzata WILK, AGH University of Science and Technology, Poland
Maciej ŚLIZ, AGH University of Science and Technology, Poland
Marcin GAJEK, AGH University of Science and Technology, Poland

Beet pulp is a very wet organic waste derived from sugar production. It can be utilized for energy purposes, e.g. biogas production or as very valuable fodder for animals, mainly horses. The high moisture content (c.a. 80%) in beet pulp makes it an adequate feedstock for the hydrothermal carbonization process (HTC). Therefore, this study is focused on the hydrothermal carbonization of beet pulp. The following parameters were studied: temperatures of 180, 200, and 220C through 1, 2, 3, and 4 h of residence time. The optimal conditions of the HTC process were determined (220C and 1h) based on the physical and chemical properties of solid product hydrochar. The ultimate and proximate analyses, high heating value, energy and mass yields, and energy densification ratio were investigated. The obtained hydrochars are of a coal-like solid biofuel, and their high heating values are much higher than raw feedstock (c.a. 150% higher). The combustion performance of hydrochar based on TGA, were determined. Moreover, the fibre analysis of hydrochar using the van Soest method, and FTIR of hydrochars were applied. Concluding, the preliminary studies suggest that organic waste, beet pulp, respectively, are of great potential as an energy source using hydrothermal pretreatment.

Keywords: Hydrothermal carbonization, Hydrochar, Organic waste, Biomass, Thermal analysis
Acknowledgment: The research was funded by National Science Centre, Poland under project no 2018/02/X/ST8/02979 [MINIATURA 2]. The work was realized as a part of fundamental research co-financed by AGH University of Science and Technology [grant no]. The authors would like to express their thanks to the proprietor of the experimental apparatus EKOPROD Ltd. in Bytom.