Simulation of Municipal Solid Waste Gasification in Updraft Fixed Bed Reactors
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Date
2017-05
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Addis Ababa University
Abstract
A steady state simulation of syngas production from municipal solid waste gasification process using fixed bed gasification technology was performed using Aspen Plus. For the simulation, the average proximate and ultimate compositions of municipal solid waste obtained from the koshe open dump site were employed.
The simulation was applied to conduct sensitivity analyses in the air to solid fuel feed mass ratio and operating temperature over the key parameters: syngas molar composition, overall carbon conversion in the reactors, syngas lower heating value and heat conversion (thermal) efficiency. The achieved information allows the selection of critical operating conditions leading to improve system efficiency and environmental performance. The results indicate that the air to feed (equivalence) ratio is a key variable as it significantly affects both the syngas composition, lower heating value and thermal efficiency.
With huge organic composition of Addis Ababa municipal solid waste, the gasification simulation results are found to be satisfactory compared to gasifier database prepared for simulation purposes. At the optimum conditions of this study (T = 640 oC and equivalence ratio of 0.4), the best results found are 36.32% CO, 3.09% H2, 0.94% CH4 and a lower heating value of 6.819KJ/Nm3.
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Process Engineering Stream