Abstract

The main objectives of present experimental wok are to perform the statistical optimization, physicochemical characterization and economic analysis of soybean straw pellets obtained from tractor driven pelleting machine. In physicochemical characterization a detailed proximate analysis, ultimate analysis, thermal efficiency, Thermogravimetric analysis, Fourier transform infrared spectroscopic, and scanning electron microscopy analysis of soybean straw pellets were performed. Considering the Box-Behnken design findings, the pellet density, durability, compressive strength and power required were found to be 615.23 kg/m3, 91.47 %, 39.86 N/mm2 and 7.39 kWh respectively. Based on characterization results soybean straw pellets had an ash content of 5.20 %, a calorific value of 18.81 MJ/kg and a thermal efficiency of 19.46 %, respectively. TGA analysis indicates the maximum mass loss in the active zone due to the degradation of cellulose and hemicellulose. The pelleting machine for soybean straw, the benefit-cost ratio and the payback period were recorded to be around 1.18 and 2.10 years, respectively.

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