(372p) Optimal Design and Operation of Biomass Waste Gasification for Energy and Biochar Production
In this work, a downdraft gasifier, which has been proved to be a standout choice for medium size throughputs , is considered for biomass waste gasification approach. To facilitate the optimization of greenhouse-gas mitigation and economic feasibility of gasification approach, first-principles fix-bed gasification has been developed in MATLAB to simulate the syngas and biochar production. The model employs a three-region assumption based on different fluid velocity profiles, which divided the gasifier into a natural convection region, a forced convection region, and a mixed convection region. The predicted outputs have been validated by experimental data, with a general deviation of less than 10% .
Based on the high-fidelity gasification model, a stochastic radial basis function-based global optimization algorithm [3, 4] will be employed to optimize the process operating conditions. In this presentation, a number of decision variables will be considered for optimization, such as biomass feed, moisture content and the equivalence ratio. A multi-objective framework will be considered to maximize energy output and minimize greenhouse gas emission, tackling the trade-off between economic and environmental aspects.
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