Desenvolvimento de reator pirolítico para produção e caracterização de biochar
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Data
2018-07-06
Autores
Silva, Olivia Paula
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Universidade Federal de Mato Grosso
Resumo
The resulting product of pyrolysis, the biochar can contribute to carbon
sequestration and improve soil properties. However, biochar’s own properties vary
depending on its production parameters, such as pyrolysis temperature, heating rate,
residence time, and raw material, which makes it fundamental to understand the influence of these conditions over biochar’s chemical and physical properties. The aim is
to develop a pyloysis reactor with temperature control, and restriction on oxygen (O2)
input, to produce biochar under different conditions, as well as to study the influence
of temperature and residence time on the resulting biochar whose raw material is
cedrinho (Erisma uncinatum Warm, Vochysiaceae). The experiment was fully casual
and had a 4x3 factorial design: four temperatures (300, 400, 500 e 600 ◦C), and three
residence times (1, 2 e 3 h). The variables analyzed were immediate analysis (moisture,
content of volatile materials, ashes and fixed carbon), gravimetric yield, and pH. The
equipment showed good performance regarding temperature control and operation
safety. The heating rates varied from 25,37 to 40,42 ◦Cmin−1
, and the maximum outer
surface temperature was 144 ◦C. The temperature the most influential factor on the
studied variables. The content of volatile materials reduced by 27,17 units by rising
the temperature, while the content of fixed carbon increased by 24,77 units. pH also
increased by increasing pyrolysis temperature.
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SILVA, Olivia Paula. Desenvolvimento de reator pirolítico para produção e caracterização de biochar. 2018. 82 f. Dissertação (Mestrado em Engenharia Agrícola) - Universidade Federal de Mato Grosso, Instituto de Ciências Agrárias e Tecnológicas, Rondonópolis, 2018.