Co-firing of blends of sugarcane bagasse and coal

Autor(es)

Mortari, Daniela A. ^[1] ; Torquato, Lilian D. M. ^[2] ; Crespi, Marisa S. ^[2] ; Crnkovic, Paula M. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sch Engn Sao Carlos, BR-13566590 Sao Carlos, SP - Brazil

^[2] UNESP Sao Paulo State Univ, Inst Chem Araraquara, Dept Analyt Chem, BR-14801970 Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY; v. 132, n. 2, p. 1333-1345, MAY 2018.
• Citações Web of Science: 3

Resumo

The interaction effects between sugarcane bagasse and a Brazilian coal during co-firing were investigated by means of thermal decomposition behavior, comparison between theoretical and experimental results, activation energy, and ignition temperature. The blends were prepared in the ratios of 100:0; 75:25; 50:50; 25:75; 0:100 (bagasse/coal). The interaction effect evaluated in this study was related to the interference of the bagasse volatile matter content in the coal thermal decomposition. The thermal decomposition behavior analyses were performed in a thermogravimetric balance, and the apparent activation energy was determined by two different models-model-free and local linear integral isoconversional method-under two different heating rate ranges. The results showed that the high volatile content of the sugarcane bagasse leads to more intense combustion, lower ignition temperature, and more complex reaction mechanism, as compared to coal. When the fuels are blended, there is a temperature anticipation of the events related to the decomposition of the coal portion in the mixture, the reaction rates increase and the ash formation is affected. The kinetic data also suggested that the interaction between both materials may occur and improve the burnout of the blend in relation to the pure coal firing due to the contribution of sugarcane bagasse volatile matter. Nevertheless, the presence of the bagasse did not allow to lower activation energy during the blends devolatilization process. (AU)

• Processo FAPESP: 11/00183-2 - Emprego de análise térmica e forno tubular de queda livre (DTF) para estudar a eficiência térmica de carvões minerais, bagaço de cana-de-açúcar e suas misturas
• Beneficiário: Daniela Andresa Mortari
• Modalidade de apoio: Bolsas no Brasil - Doutorado