Coal generation by copyrolysis: effects of temperature, N2 flow and sludge percentage
DOI:
https://doi.org/10.6008/CBPC2179-6858.2020.003.0012Keywords:
Biomass, Thermochemical conversion, Coal, Optimization, Response surface methodologyAbstract
Copyrolysis (CP) is the cleavage of more than one biomass by heat in the absence of oxygen, which yields liquid, solid, and gas products. Coal constitution depends on copyrolisys conditions and on the process adopted. The combined effect of temperature, nitrogen flow, and percent composition of treated industrial effluent sludge from a rice processing plant (TIESRPP) with rice hulls (RH) for coal generation through CP was studied through planning Box-Behnken (BB), with TIESRPP percentages ranging from 25 to 75%, temperature between 500 and 700 °C, and N2 flow of 1 to 5 mL.min-1. The first-order polynomial model explained over 90% of the maximum coal generation phenomenon. Coal generation significantly depended on two of the three variables: TIESRPP percentage and temperature. The model showed the optimal conditions to maximize the generation of the solid phase were 500 °C and an excess of 62.5% RH regardless of N2 flow. The highest coal generation was experimentally observed to be 75% TIESRPP, 500 °C, and N2 flow of 3 mL.min-1 with conversion of 67.09% of the initial biomass.
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