Examinando por Materia "Simulation model"

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  • Publicación
    Acceso abierto
    Assessment of the energy recovery potential of oil sludge through gasification aiming electricity generation
    (2021-01-15) Castillo Santiago, York; Martínez-González, Aldemar; Venturini, Osvaldo José; Yepes Maya, Diego Mauricio; GAIA
    Thermochemical conversion of oil sludge (OS) residues from crude oil refinery was studied as an alternative for treatment and energy recovery before OS final disposal. A simulation model for OS gasification was developed and validated by using AspenPlus™ V 11.0. Three scenarios by considering different gasifying agents were evaluated, aiming the assessment of different gasification parameters and performance indexes such as gasification temperature, cold-gas efficiency, syngas yield, and LHV. To evaluate the potential use of syngas to generate electricity, three different prime movers such as steam Rankine cycle, gas microturbine, and gas-Internal Combustion Engine (ICE) were modeled. A hydrogen-rich syngas from OS gasification with air/steam mixture was reached (38.2 vol%) at ER 0.20. Syngas LHV and syngas yield ranged between 8.6 and 3.0 MJ/Nm3 and 0.6–1.3 Nm3/kg OS, when ER was increased from 0.25 to 0.45, respectively. The highest energy recovery potential (electricity generation) was obtained when using syngas to power a gas-ICE, with a generation index of about 0.47 kWh/kg-OS at ER ratio of 0.25. Therefore, OS thermochemical conversion into syngas and its subsequent use to generate electricity could be a technological alternative to oily residues management inside an oil refinery that could efficiently transform a dangerous residue into electricity.
  • Publicación
    Acceso abierto
    Simulation of tar reduction alternatives in the coffee stems gasification process
    (2018) Oliveros, C.; Rubiano, J.E.; Posso Rivera, Fausto René; Acevedo-Páez, Juan Camilo
    This work developed a simulation model able to compare three different secondary methods of tar retention that assess the energy consumption, investments and tar concentration of each alternative to clean the syngas produced in the gasification of coffee stems. The alternatives were the installation of a car filter (FC), a heat exchanger (IC) and activated carbon filtering media (FCA). The experiments were carried out in the Power Pallet GEK 20 kW downstream Gasifier and runs of 3, 6, 9, 12 and 24 hours of operation. The tar concentration was measured via VOC’s direct detection equipment and showed values of 23, 18.7, y 222.3 for IC, FC and FCA respectively. Estimation errors obtained for the model developed in Aspen Plus® software for tar concentration were 16.75%, 14.63% and 0.02% for normal operation, FC and IC respectively. An Economic evaluation reported a value of 0.43, 4.06, 0.45 and 4.09$/ produced for normal operation, FC, IC and FCA respectively. Finally, the analysis of the internal combustion engine thermal efficiency exposed that IC and FC potentially increase the total energy production in 440 ℎ per year compared to normal operation.