Steam gasification behavior of tropical agrowaste: A new modeling approach based on the inorganic composition

Millán, Lina María Romero; Vargas, Fabio; Nzihou, Ange

doi:10.1016/j.fuel.2018.07.053

Cited by 25 publications

(27 citation statements)

References 43 publications

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“…For the three feedstocks, the recovered char at the end of the gasification process was reduced with the increase of the steam fraction in the gasifying agent, the temperature, and the gasification time. The impact of these parameters on the gasification behavior of CS, BG, and OPS was analyzed in a previous work at a thermogravimetric scale 18 and is in accordance with the results obtained in this study. More specifically, higher gasification temperatures and steam quantities are related to higher reactivities and then to higher carbon conversions and lower char yields.…”

Section: Resultssupporting

confidence: 90%

“…The chars obtained from the steam gasification of oil palm shells (OPS), coconut shells (CS), and bamboo guadua (BG) were characterized and analyzed in this study. The chemical organic and inorganic composition of the raw materials were determined according to the standards of solid biofuels, detailed in a previous work, 18,22 and are summarized in Table 1. 2.2. Gasification Experimental Setup.…”

Section: Methodsmentioning

confidence: 99%

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Catalytic Effect of Inorganic Elements on Steam Gasification Biochar Properties from Agrowastes

2019

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Steam gasification chars from lignocellulosic agrowastes are highly microporous materials with specific surface areas between 500 and 1000 m 2 /g, comparable to that of activated carbons. Nevertheless, the analysis and comparison of gasification chars from different feedstocks revealed the important effect of the raw biomass inorganic composition on their physicochemical properties. In particular, it was found that the catalytic effect of alkali and alkaline earth metals (AAEM) on the steam gasification reactions resulted in higher char specific surface areas, with greater proportions of surface oxygen-containing functional groups. In contrast, this effect was not observed for Si and P rich samples. In accordance, the biomass inorganic ratio K/(Si + P) proved to be a valuable indicator of the steam gasification char reactivity, giving a new insight for the engineering of useful value-added materials from lignocellulosic agrowastes. The mechanisms presented in this work could be an important reference for real gasification applications working with different kind of residues when the valorization of the solid byproduct is targeted.

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Section: Resultssupporting

confidence: 90%

Section: Methodsmentioning

confidence: 99%

Catalytic Effect of Inorganic Elements on Steam Gasification Biochar Properties from Agrowastes

2019

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“…Biomass content in inorganic elements, especially potassium, silicon and phosphorous, is known to impact solid yield in gasification reactions at higher temperatures (above 800 • C) [32,33]. However, this impact is still open to discussion in the torrefaction temperature range [17,[34][35][36].…”

Section: Influence Of the Inorganic Element Contentmentioning

confidence: 99%

“…These studies concluded that CO 2 influence on solid transformation through torrefaction was existent but limited [29]. The presence of water in the torrefaction atmosphere was studied in 'wet torrefaction' or hydrothermal carbonization, where biomass typically reacts between 180 and 260 • C at a pressure of several tens of bars [30,31], as well as in gasification, at temperatures from 800 • C. In gasification, potassium (K) was reported as a catalyst of solid mass loss, while phosphorous (P) and silicon (Si) seem to inhibit gasification reactions [32,33]. These conditions of temperature and pressure drastically differ from those encountered in typical torrefaction, and thus, clearly prevent the drawing of conclusions that are valid for this process [17,[34][35][36] The significant water vapor content of the torrefaction gases may impact biomass solid degradation kinetics in torrefaction, and thus, needs to be considered so as to optimize the process at an industrial scale.…”

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confidence: 99%

Torrefaction of Woody and Agricultural Biomass: Influence of the Presence of Water Vapor in the Gaseous Atmosphere

et al. 2020

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Biomass preheating in torrefaction at an industrial scale is possible through a direct contact with the hot gases released. However, their high water-content implies introducing moisture (around 20% v/v) in the torrefaction atmosphere, which may impact biomass thermochemical transformation. In this work, this situation was investigated for wheat straw, beech wood and pine forest residue in torrefaction in two complementary experimental devices. Firstly, experiments in chemical regime carried out in a thermogravimetric analyzer (TGA) showed that biomass degradation started from lower temperatures and was faster under a moist atmosphere (20% v/v water content) for all biomass samples. This suggests that moisture might promote biomass components’ degradation reactions from lower temperatures than those observed under a dry atmosphere. Furthermore, biomass inorganic composition might play a role in the extent of biomass degradation in torrefaction in the presence of moisture. Secondly, torrefaction experiments on a lab-scale device made possible to assess the influence of temperature and residence time under dry and 100% moist atmosphere. In this case, the difference in solid mass loss between dry and moist torrefaction was only significant for wheat straw. Globally, an effect of water vapor on biomass transformation through torrefaction was observed (maximum 10%db), which appeared to be dependent on the biomass type and composition.

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“…Steam gasification biochars obtained from three tropical lignocellulosic agrowastes were characterized and analyzed in this study. Coconut shells (CS), bamboo guadua (BG), and oil palm shells (OPS) were selected as raw materials, considering their different macromolecular and inorganic composition, determined according to the standards of solid biofuels (detailed in previous works [29,30]), and summarized in Table 1.…”

Section: Raw Materialsmentioning

confidence: 99%

Characterization of Steam Gasification Biochars from Lignocellulosic Agrowaste Towards Soil Applications

Millán

Vargas

Nzihou

2020

Waste Biomass Valor

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The main objective of this work was to analyze the physico-chemicals properties of biochars produced from the steam gasification of different lignocellulosic agrowastes, and determine the suitability of these materials to be used in soil amendment and remediation applications. Steam gasification biochars from three lignocellulosic agrowastes were extensively characterized. Coconut shells (CS), bamboo guadua (BG), and oil palm shells (OPS) were chosen as raw materials, considering their different macromolecular structure and inorganic composition. The biochars composition, morphology, pH, acid neutralization (ANC) and cation exchange (CEC) capacities, as well as their mineral release at different conditions were evaluated and compared. The experimental results showed that the inorganic content and composition of the biochars have a stronger impact on their properties for soil applications, in comparison to their organic composition and morphology. In particular, BG biochar, the sample with the highest mineral content, exhibited the most notable cation exchange (45 cmol c /kg) and acid neutralization capacities (125 cmol H + /kg), together with the greatest release of plant micro and macro-nutrients. In the case of biochars with low mineral content, higher CEC and ANC were most related to the presence of oxygen-containing functional groups in their surface. Considering that agricultural residues come from numerous sources and activities, the presented results usefully contribute to the comprehension of the relationship between the raw biomass characteristics, the physico-chemical properties of steam gasification biochars, and their expected performance in soil applications, opening a new promising valorization pathway for these materials.

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Steam gasification behavior of tropical agrowaste: A new modeling approach based on the inorganic composition

Cited by 25 publications

References 43 publications

Catalytic Effect of Inorganic Elements on Steam Gasification Biochar Properties from Agrowastes

Catalytic Effect of Inorganic Elements on Steam Gasification Biochar Properties from Agrowastes

Torrefaction of Woody and Agricultural Biomass: Influence of the Presence of Water Vapor in the Gaseous Atmosphere

Characterization of Steam Gasification Biochars from Lignocellulosic Agrowaste Towards Soil Applications

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