Özet:

This study aims to determine the effect of initial temperature (IT) on characteristics of coconut shell gasification in a dual fluidized bed gasifier (DFBG) using air as gasification agent with Computation Particle Fluid Dynamics (CPFD) simulations. DFBG has two reactors that are linked by a loop-seal and an L-valve. The simulation used silica sand as a particle and coconut shell as fuel, and it was performed with three different gasifier initial temperatures (IT) of 873 K, 973 K, and 1073 K. The results show that each component of the DFBG system can function as expected, with particles in the bed moving smoothly. The DFBG system temperature rises as IT rises, but the gasifier operates at a temperature lower than its initial temperature. The temperature at the loop-seal outlet is marginally greater than at the gasifier. The mole fraction of producer gases follows the same pattern, with CO being the most abundant, followed by H2, CH4, and CO2. The CO composition rises in tandem with the level of IT simulation. In contrast, the composition of H2, CO2, and CH4 tends grow steadily as the initial temperature rises from 873 to 973 K and then declines as the initial temperature increases to 1073 K. Compared to the gas yields from IT= 873 K and IT=973 K, the IT=1073 K simulation had the largest gas yields

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