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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Produção e caracterização de biochar de palha de cana-de-açúcar (Saccharum sp.) / Production and characterization of sugarcane straw biochar (Saccharum sp.)

Pires, Isis Cristina de Souza Adhmann 06 October 2017 (has links)
Submitted by Isis Pires (isis@ufscar.br) on 2017-11-09T18:31:35Z No. of bitstreams: 2 Versão Final PDF.pdf: 1982326 bytes, checksum: a60f34a491981fade04b4ea03c368547 (MD5) Carta comprovante de versão final.pdf: 284749 bytes, checksum: 83211b0142332a261bde4324e5f13e16 (MD5) / Approved for entry into archive by Milena Rubi ( ri.bso@ufscar.br) on 2017-11-10T12:08:33Z (GMT) No. of bitstreams: 2 Versão Final PDF.pdf: 1982326 bytes, checksum: a60f34a491981fade04b4ea03c368547 (MD5) Carta comprovante de versão final.pdf: 284749 bytes, checksum: 83211b0142332a261bde4324e5f13e16 (MD5) / Approved for entry into archive by Milena Rubi ( ri.bso@ufscar.br) on 2017-11-10T12:10:20Z (GMT) No. of bitstreams: 2 Versão Final PDF.pdf: 1982326 bytes, checksum: a60f34a491981fade04b4ea03c368547 (MD5) Carta comprovante de versão final.pdf: 284749 bytes, checksum: 83211b0142332a261bde4324e5f13e16 (MD5) / Made available in DSpace on 2017-11-10T12:10:29Z (GMT). No. of bitstreams: 2 Versão Final PDF.pdf: 1982326 bytes, checksum: a60f34a491981fade04b4ea03c368547 (MD5) Carta comprovante de versão final.pdf: 284749 bytes, checksum: 83211b0142332a261bde4324e5f13e16 (MD5) Previous issue date: 2017-10-06 / Não recebi financiamento / The aim of this work was to study pyrolysis conditions (thermal degradation in a controlled presence of oxygen) for make biochar is a kind the raw-material used was the sugarcane straw (Saccharum sp.), that is an abundant residue in the fields. Pyrolysis techniques were used with fixed time of 3 hours and temperature variations of 200 °C, 250 °C, 300 ° and 400 °C, totalizing four treatments. The Biochar produced was characterized by immediate and thermogravimetric analyses. The obtained results showed the lignocellulosic materials transformation to fixed carbon, and the direct influence of pyrolysis temperature on cellulose and lignin degradation. The fixed carbon content obtained for the treatments carried out were T1 = 42 %, T2 = 51 %, T3 = 59 % and T4 = 65 %. The gravimetric yields were T1 = 55 %, T2 = 36 %, T3 = 30 % and T4 = 25 %. It can be observed the direct influence of the pyrolysis temperature in the cellulose and lignin degradation in the thermogravimetric analyses. Aiming the equilibrium between gravimetric yield and fixed carbon content, can be concluded that the better temperature for the slow pyrolysis, in the conditions developed in this work, was about to 250 °C. / Este estudo buscou condições de pirólise (degradação térmica com presença limitada de oxigênio) para produção de biochar, o que é um carvão vegetal destinado ao emprego como condicionador de solos. A matéria-prima utilizada foi a palha de cana-de-açúcar (Saccharum sp.). Foram realizadas pirólises com tempo fixo de 3h e variação de temperaturas de 200 (T1), 250 (T2), 300 (T3) e 400 (T4), totalizando quatro tratamentos. O biochar produzido foi caracterizado por meio de análise imediata e termogravimétrica. Os teores de carbono fixo encontrados para os tratamentos foram 42% (T1), 51% (T2), 59% (T3) e 65% (T4), e os rendimentos gravimétricos para 55% (T1), 36% (T2), 30% (T3) e 25% (T4). Pode-se observar a influência direta da temperatura de pirólise na degradação da celulose e lignina através das análises termogravimétricas. Almejando o equilíbrio entre rendimento gravimétrico e teor de carbono fixo, pode-se concluir que a melhor temperatura para pirólise, nas condições desenvolvidas neste estudo foi de aproximadamente 250ºC.

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