A robust numerical model for characterizing the syngas composition in a downdraft gasification process

Gagliano, Antonio; Nocera, Francesco; Patania, F.; Bruno, M.; Castaldo, Davide Giovanni

doi:10.1016/j.crci.2015.09.019

Cited by 39 publications

(18 citation statements)

References 46 publications

(53 reference statements)

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“…The mathematical modeling of the gasification departs from a proposed global reaction. On the reactants side the biomass is usually represented by a molecule comprising C, H, O and N [34,42,59,62,66,67,71,72]. Some authors consider also sulfur (S) in the biomass molecule [55,56,58,68,71], and others neglected the nitrogen content in the biomass molecule [46,52,53,65,74].…”

Section: Rupesh Et Al (2015) [71]mentioning

confidence: 99%

“…In addition, the unconverted carbon (C) is included by several authors [34,52,56,58,62,65,[69][70][71]74]. Instead, some authors consider tars [59,66], others char [63,67], tar and char [72] and ashes [68]. Other gases can also be found, such as H 2 S [58], SO 2 [55,56,68] as resulting products of the inclusion of the sulfur in the biomass molecule.…”

Section: Rupesh Et Al (2015) [71]mentioning

confidence: 99%

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A Holistic Review on Biomass Gasification Modified Equilibrium Models

et al. 2019

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Biomass gasification is realized as a settled process to produce energy in a sustainable form, between all the biomass-based energy generation routes. Consequently, there are a renewed interest in biomass gasification promoting the research of different mathematical models to enlighten and comprehend gasification process complexities. This review is focused on the thermodynamic equilibrium models, which is the class of models that seems to be more developed. It is verified that the review articles available in the literature do not address non-stoichiometric methods, as well as an ambiguous categorization of stoichiometric and non-stoichiometric methods. Therefore, the main purpose of this article is to review the non-stoichiometric equilibrium models and categorize them, and review the different stoichiometric equilibrium model’s categorization available in the literature. The modeling procedures adopted for the different modeling categories are compared. Conclusion can be drawn that almost all equilibrium models are modified by the inclusion of empirical correction factors that improves the model prediction capabilities but with loss of generality.

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Section: Rupesh Et Al (2015) [71]mentioning

confidence: 99%

Section: Rupesh Et Al (2015) [71]mentioning

confidence: 99%

A Holistic Review on Biomass Gasification Modified Equilibrium Models

et al. 2019

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“…One of the hypotheses used as a basis of this work to model the downdraft gasification process states that the producer gas from downdraft reactors contains a low concentration of tars, lower than 1 mg/Nm 3 (Gagliano et al 2016). This is due to the synergy between the low volatile matter content of torrefied biomass and the cracking of tars in downdraft gasification oxidation and reduction stages; consequently, the tars formation in the global equation is not meaningful (Kuo et al 2014;Patra and Sheth 2015;Gagliano et al 2016).…”

Section: Model Descriptionmentioning

confidence: 91%

“…This is due to the synergy between the low volatile matter content of torrefied biomass and the cracking of tars in downdraft gasification oxidation and reduction stages; consequently, the tars formation in the global equation is not meaningful (Kuo et al 2014;Patra and Sheth 2015;Gagliano et al 2016).…”

Section: Model Descriptionmentioning

confidence: 99%

“…Equations 5 and 6 were employed in this work as auxiliary equations to solve the nonlinear equations system. These two reactions have been taken into account by Gagliano et al (2016) and Aydin et al (2017) to solve downdraft gasification models based on equilibrium assumptions. Additional gasification products, H2S and COS, are added to the model that are associated with the sulfur contained in the biomass.…”

Section: Model Descriptionmentioning

confidence: 99%

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Effect of Torrefied Wood Biomass under an Oxidizing Environment in a Downdraft Gasification Process

Ramos-Carmona

Pérez

2017

BioResources

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The effect of composition and heating value of torrefied biomass under an oxidizing atmosphere at different conditions (180, 210, and 240 °C during 30, 75, and 120 minutes) was studied relative to downdraft gasification performance. An extended model for gasification in thermochemical equilibrium was used to evaluate the effect of pretreated biomasses, fuelto-air equivalence ratio, and char byproduct production on the producer gas composition, reaction temperature, cold gas efficiency (CGE), and the engine fuel quality (EFQ). The model was validated with experimental data, reaching a global relative error of 8.5%. For raw or torrefied biomasses, with regard to char production, the CGE decreases if char increases; this is due to the fact that the process tends to combustion regimes when a lower amount of carbon is involved in the gasification reaction. Otherwise, the CGE and EFQ increase (up to 80% and 2.5 MJ/kg, respectively) if fuel-to-air ratio increases. With regard to the torrefied biomass, it is highlighted that CGE and EFQ increase from 77% to 82% and from 2.2 MJ/kg to 2.5 MJ/kg, respectively, when the torrefaction conditions (temperature and/or time) increase. This behavior is related to the increase of the autothermal zones in the gasification process and due to the higher heating value of torrefied biomass.

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