Thermochemical equilibrium modeling of biomass downdraft gasifier: Stoichiometric models

Mendiburu, Andrés Z.; Carvalho, João Andrade de; Coronado, Christian Jeremi R.

doi:10.1016/j.energy.2013.11.022

Cited by 82 publications

(34 citation statements)

References 48 publications

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“…The energy obtained here covers the heat demand of the thermal decomposition in endothermic processes. An important feature of the further zones is the decomposition of tar and its conversion into smaller molecules, which is very important for the operation of the Gary motors [22,23]. The goal was that the tar should not cross the oxidation zone.…”

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confidence: 99%

Improving the Efficiency of Pyrolysis and Increasing the Quality of Gas Production through Optimization of Prototype Systems

et al. 2019

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Pyrolysis is a thermochemical process that consists of the degradation of organic polymers and biomass minerals in lignocellulose materials. At low pyrolysis temperature (300–400 °C), primarily carbon is produced during the reaction time. Rapid pyrolysis takes place at temperatures between 500 and 650 °C. If the temperature is higher than 700 °C, the final product is methane, also known as biogas. The pyrolysis generator can be combined with a small power plant (CHP), which is a promising technology because the unit can be installed directly near the biomass production, and electricity can be fed de-centrally to the public utility network, while there are several possibilities for using waste heat in local systems. Carbonaceous ash can be utilized well in the agricultural field, because, in areas with intensive farming, the soil suffers from carbon and mineral deficiencies, and the phenomenon of material defect can be reduced by a proper level of implementation. This study describes the technical content of the biochar pilot project, and then, through a detailed presentation of the experimental results, we interpret the new scientific results. Our aim is to improve the quality of the produced gas by increasing the efficiency of the pyrolysis generator. In order for the pyrolysis unit to operate continuously, with proper efficiency and good gas quality, it is necessary to optimize the operation process. Our review reveals that the use of vibration may be advantageous during pyrolysis, which affects the mass of the pyrolysis carbon in a plane. Accordingly, the application of vibration to the input section of the funnel might enhance the quality of the gas, as well. The study concludes that more accurate dimensioning of the main parts of the gas reactor and a more convenient design of the oxidation and reduction zones enhance the good-quality gas output.

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Section: Name Of Each Partmentioning

confidence: 99%

Improving the Efficiency of Pyrolysis and Increasing the Quality of Gas Production through Optimization of Prototype Systems

et al. 2019

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“…There are several inorganic compounds contained in the biomass ash, because of this it is not possible to write a general chemical formula for the biomass ash. Therefore, in this work, biomass ash was assumed as being composed solely of silicon dioxide ðSiO 2 Þ, as suggested by Souza-Santos [2] and applied in previous works [13,21].…”

Section: Biomass Representation and Propertiesmentioning

confidence: 99%

Modeling of syngas composition obtained from fluidized bed gasifiers using Kuhn–Tucker multipliers

Amaro

Mendiburu

Ávila

2018

Energy

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This work aims to develop a modified chemical equilibrium model to accurately determine the syngas (synthesis gas) composition obtained from fluidized bed gasifiers. In order to do so, an optimization method was applied to determine the correction factors which modify the chemical equilibrium constants, the carbon conversion efficiency and the enthalpy of reaction. The gasification agents considered for this study were: air, steam, airesteam, and airesteameoxygen. The optimization method used the KuhneTucker multipliers to obtain small RMS errors. A total of 76 experimental compositions of syngas were selected. Among these data 60 were used to obtain correlations for the correction factor, the carbon conversion efficiency and the enthalpy of reaction. Then, a modified chemical equilibrium model was formulated by a taking advantage of these correlations. The modified chemical equilibrium model was validated showing very good accuracy for the determination of the syngas composition, the RMS error were found to be between 0.94 and 4.84.

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“…The first studies mainly refer to mathematical models based on thermodynamic equilibrium [16] and/or strongly simplified kinetics [17]. The thermodynamic models have the advantage of being independent on reactor design and are useful to study the influence of major process parameters [18].…”

Section: Introductionmentioning

confidence: 99%

Acid Gas to Syngas (AG2S™) technology applied to solid fuel gasification: Cutting H2S and CO2 emissions by improving syngas production

Bassani

Pirola

Maggio³

et al. 2016

Applied Energy

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Thermochemical equilibrium modeling of biomass downdraft gasifier: Stoichiometric models

Cited by 82 publications

References 48 publications

Improving the Efficiency of Pyrolysis and Increasing the Quality of Gas Production through Optimization of Prototype Systems

Improving the Efficiency of Pyrolysis and Increasing the Quality of Gas Production through Optimization of Prototype Systems

Modeling of syngas composition obtained from fluidized bed gasifiers using Kuhn–Tucker multipliers

Acid Gas to Syngas (AG2S™) technology applied to solid fuel gasification: Cutting H2S and CO2 emissions by improving syngas production

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