Abstract
With the growing population, agriculture productivity is increasing due to the high demand for food, which in turn produces a large amount of agricultural waste. Pyrolysis of crop residues is one of the suitable options to produce biochar and can be utilized as a fuel. In the present study, the slow pyrolysis of rice straw was carried out at four temperatures, 300 °C, 400 °C, 500 °C, and 600 °C. It was observed that biochar yield decreases (57.87–35.63%) with an increase in the process temperature. The physiochemical properties such as fixed carbon (43.91–57.63%), heating value (16.59–19.69 MJ/kg), carbon (63.77–85.13%) in biochar increases with temperature. Burning of rice straw (3Mt/year) emits the greenhouse gas (GHG) emission of about 10,953 (CO2e) Gg/year, while the combustion of biochar produced from rice straw at different temperatures emits the emission in the range of 2131–3239 (CO2e) Gg/year. The electricity generation potential analysis for produced biochars was carried out with two different power plant efficiency 25 and 30%. The electricity potential for power plant efficiency 25% and 30% was observed in the range of 1.2–1.82 TWh and 1.44–2.18 TWh, respectively.
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