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Percorrer por autor "Dhaoui, Echrak"

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  • Thermodynamic and economical analysis of internal combustion engines fed by wood gasifier
    Publication . Dhaoui, Echrak; Ribeiro, Luís Frölén; Kallel, Ftouh
    This dissertation consists of a numerical and theoretical thermodynamic and economical study of a small scale wood biomass gasi cation of two systems using internal combustion of two engines; the RCX-210 engine of the MRX-50 motor pump for System 1 and the engine of a Honda CG-125 Titan motorcycle for System 2. This analysing consisted on using the Aspen Plus software for modeling the prototype of the two system to study the thermoenergetic analysis numerically as well as the laws of thermodynamics, obtaining as a results the composition of syngas 20.68% CO2, 13% CO, 60.07% N2, 0.133% H2, and 0.0339% CH4 of mass fraction with 5500 KJ/Kg of LHVsyngas for 0.577*10􀀀3 Kg/s of biomass for system 1 and respectively, 21.25, 10.92, 51.58, 0.933, 0.000198 for CO2, CO, N2, H2, and CH4 for 1.6*10􀀀3 Kg/s of biomass for system 2. The power delivered to the shaft of the System 1 engine value is 2.561 kW and for the System 2 engine value is 6.40 kW. Moreover, with the global energy analysis an e ciency of 22.8% was obtained for system 1 and 20.27% for system 2 , observing how e ciently the biomass was converted to the operation of the system. The Third Law of Thermodynamics was applied, identifying the exergetic performance analysis, with irreversibilities values for the System 1 engine value is 4.22 kW and for the System 2 engine value is 11.52 kW. Finally, an overall exergetic e ciency of 24.4% for system 1 and 21.63% for system 2. The economic analysis consisted on determining the annual saving expected (ASE) to study the payback period which is 4 years with a 12% of interest rate. The Net Present Value (NPV) ranges from 4 430.332 - 11 177.64e for 2000-6000 h/year of operation period and the Internal Rate of Return IRR is 20.30%.
    2022Dissertação de mestrado Acesso aberto Ver mais