Carbonization of corncobs for the preparation of barbecue charcoal and combustion characteristics of corncob char

• Published in: Waste management (Elmsford) 2020-03, Vol.105, p.560-565
• Main Authors: Kluska, Jacek, Ochnio, Mateusz, Kardaś, Dariusz
• Format: Article
• Language: English
• Subjects: Barbecue; Carbon; Carbonization; Char; Charcoal; Corncob; Temperature; Wood; Zea mays
• ISSN: 0956-053X; 1879-2456
• DOI: 10.1016/j.wasman.2020.02.036

•Corncob waste can be used for barbecue charcoal preparation.•The corncob char yield decreases with the increase in carbonization temperature.•The fixed carbon content and HHV increase with carbonization temperature.•Charcoal obtained at 500 °C meets the chemical standards for the barbecue application. The paper examines the process of carbonization of waste from corncobs at carbonization temperatures within a range of 300–700 °C in a laboratory-scale reactor. These studies are important because of reductions in wood resources for the preparation of barbecue charcoal due to environmental protection laws and legislative processes in many countries aimed at the protection of forest resources. The results presented here include the physical and chemical properties of char as a function of carbonization temperatures as well as the characteristics of the heating rate of a fixed bed of corncobs and within a single corncob particle. The combustion characteristics of the char were determined using thermogravimetric analysis. The results show that the volatile matter yield of the char decreased, whereas the fixed carbon yield and higher heating value (HHV) increased, along with higher carbonization temperatures. TGA analysis shows that the ignition and burnout temperature of the char increased, with a simultaneous decrease in the value of the S index, along with increased carbonization temperatures. The results show that carbonization temperatures of 500 °C and above meet the standards for the production of barbecue charcoal.