Open AccessEffects of Different Carbonization Conditions on the Color Change of Biochar
Author(s) -
Alperay Altıkat,
Mehmet Hakkı Alma
Publication year - 2021
Publication title -
turkish journal of agricultural engineering research
Language(s) - English
Resource type - Journals
ISSN - 2717-8420
DOI - 10.46592/turkager.2021.v02i02.004
Subject(s) - biochar , carbonization , volumetric flow rate , heat of combustion , pyrolysis , biomass (ecology) , chemistry , pulp and paper industry , flow (mathematics) , materials science , adsorption , agronomy , organic chemistry , thermodynamics , mathematics , combustion , biology , engineering , physics , geometry
The aim of this research was to determine the effects of different carbonization temperature, gas flow rate and heating rates on biochar's color change. Three different carbonization temperatures (400°C, 500°C, and 600°C), two different gas flow rates (0.2 l min-1 and 0.5 l min-1) and two different heating temperature rates (30°C min-1 and 60°C min-1) were used in the experiments. The color changes of biochar were examined utilizing the international approved L*, a*, b* system. Atriplex nitens Schkuhr was used as a biomass source in the experiments. High carbonization temperature and high gas flow rate caused a decrease in the “L” value of biochar. It is an indication that the color is getting darker, when the L value approaches zero. In the study, only the effect of gas flow rate on the "a" value was found to be statistically significant (P≤0.05). The increase in gas flow rate caused the biochar to become darker by increasing the deep red tone. Heating rate and gas flow speed significantly influenced the "b" values of biochar. The slow heating rate and high gas flow rates made the biochar color darker. At end of the research, it can be said that the biochar produced at high carbonization temperature, low heating rate and high gas flow rates will have darker tones.