Kathrin Weber og Peter Quicker
The authors are thankful for the financial support from the Research Council of Norway and the industry partners of the BioCarb + project, Elkem AS, Norsk Biobrensel AS, AT Biovarme AS, Eyde-nettverket, Saint Gobain Ceramic Materials AS, Eramet Norway AS, Alcoa Norway AS.
This paper reviews and summarizes the results from a large number of experiments on biochar production in order to give a general overview of the properties that can be achieved by feedstock selection and process design. Production processes include both torrefaction as well as slow pyrolysis at high temperatures. The data evaluation has shown that among all process conditions, the treatment temperature has by far the most dominant influence on all properties. Especially the rather narrow temperature range between 200 and 400 °C causes the most significant changes and is therefore very sensible to influences and possibly difficult to control.