Air-steam gasification of five regional lignocellulosic wastes: Exergetic evaluation

Echegaray, Marcelo; García, Daniela Zalazar; Mazza, Germán; Rodríguez, Rosa

doi:10.1016/j.seta.2018.12.015

Cited by 29 publications

(8 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, another study with tomato residues not processed and similar to TW from this study reported closer elemental compositions to those obtained in this work. The elemental analysis of WW is in agreement with the literature, − but some authors detected sulfur contents from 0.03% up to 5.34%, which may be explained by the different processing methods that were applied to obtain the winery wastes. The higher C/N ratios of forestry residues, when compared to the agrowastes, confer them a higher resistance to biological degradation, since microorganisms need a proper balance of those elements.…”

Section: Resultssupporting

confidence: 87%

Assessment of Agroforestry Residues: Their Potential within the Biorefinery Context

Gaspar

Mendes

Pinela

et al. 2019

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

The concept of bioeconomy has been promoted worldwide in order to replace fossil-based resources and to find new strategies for waste management, by converting biomass into energy, chemicals, and value-added products, in a sustainable way. Despite the efforts that have been made in this area, there are still some unexplored raw materials globally, namely from agricultural and forestry industries. Therefore, the aim of this work was to characterize four abundant residues from the Portuguese agroforestry industry, including pruning residues (pine branches, PB) and stumps (PS), tomato waste (TW), and winery wastewater (WW), for analyzing their potential within the biorefinery context. Volatiles were analyzed by gas-chromatography, and compounds with repellent/attractant properties were found for PB and PS, while flavor-enhancers were particularly identified in agrowastes. Composition analysis revealed that both TW and WW had the potential for biogas generation (BMP ∼340 and ∼250 NL CH4/kg VS, respectively), whereas forestry residues (PS and PB) can be recovered for thermal energy (HHV ∼20 MJ/kg) and bioethanol production (∼0.3−0.4 L/kg). Among all the aqueous extracts that were obtained, PS showed both the highest antioxidant activity (IC 50 ∼6 μg/mL) and total phenolic content (∼400 mg GAE/g extract). All residues were demonstrated to be promising for the Portuguese biobased economy.

show abstract

Section: Resultssupporting

confidence: 87%

Assessment of Agroforestry Residues: Their Potential within the Biorefinery Context

Gaspar

Mendes

Pinela

et al. 2019

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…is not necessary in the macro-TGA reactor [9,27]. The operating temperature was raised from 300 K to 1173 K at heating rates of 5, 10 and 15 K/min.…”

Section: Methodsmentioning

confidence: 99%

“…However, their values fall within the range 15-45 % dry weight, and are adequate to subject these biowastes to thermal treatments, like pyrolysis and gasification [5][6][7][8]. In addition, the higher the lignin content the higher the H2 yield in gasification processes is [9]. Another crucial property concerning the biomass composition related to pyrolysis and gasification processes is the ash content.…”

Section: Introductionmentioning

confidence: 99%

Kinetic analysis and thermodynamics properties of air/steam gasification of agricultural waste

Fernandez

Ortiz

Asensio

et al. 2020

Journal of Environmental Chemical Engineering

Self Cite

View full text Add to dashboard Cite

“…Generally, increasing gasification temperature promotes the water gas shift and steam reforming reactions, leading to higher H2 and CO concentrations while raising the process exergy efficiency. In addition, exothermic reactions such as CO2 and CH4 forming reactions are suppressed by increasing the gasification temperature owing to the promotion of Boudouard and methane reforming reactions, respectively (Echegaray et al, 2019). Like reaction temperature, the gasifying agent/biomass ratio markedly affects syngas composition and calorific value.…”

Section: Keywordmentioning

confidence: 99%

Exergy sustainability analysis of biomass gasification: a critical review

et al. 2022

View full text Add to dashboard Cite

Biomass gasification technology is a promising process to produce a stable gas with a wide range of applications, from direct use to the synthesis of value-added biochemicals and biofuels. Due to the high capital/operating costs of the technology and the necessity for prudent management of thermal energy exchanges in the biomass gasification process, it is important to use advanced sustainability metrics to ensure that environmental and other sustainability factors are addressed beneficially. Consequently, various engineering techniques are being used to make decisions on endogenous and exogenous parameters of biomass gasification processes to find the most efficient, viable, and sustainable operations and conditions. Among available approaches, exergy methods have attracted much attention due to their scientific rigor in accounting for the performance, cost, and environmental impact of biomass gasification systems. Therefore, this review is devoted to critically reviewing and numerically scrutinizing the use of exergy methods in analyzing biomass gasification systems. First, a bibliometric analysis is conducted to systematically identify research themes and trends in exergy-based sustainability assessments of biomass gasification systems. Then, the effects of biomass composition, reactor type, gasifying agent, and operating parameters on the exergy efficiency of the process are thoroughly investigated and mechanistically discussed. Unlike oxygen, nitrogen, and ash contents of biomass, the exergy efficiency of the gasification process is positively correlated with the carbon and hydrogen contents of biomass. A mixed gasifying medium (CO2 and steam) provides higher exergy efficiency values. The downdraft fixed-bed gasifier exhibits the highest exergy efficiency among biomass gasification systems. Finally, opportunities and limitations of exergy methods for analyzing sustainability aspects of biomass gasification systems are outlined to guide future research in this domain.

show abstract

Air-steam gasification of five regional lignocellulosic wastes: Exergetic evaluation

Cited by 29 publications

References 30 publications

Assessment of Agroforestry Residues: Their Potential within the Biorefinery Context

Assessment of Agroforestry Residues: Their Potential within the Biorefinery Context

Kinetic analysis and thermodynamics properties of air/steam gasification of agricultural waste

Exergy sustainability analysis of biomass gasification: a critical review

Contact Info

Product

Resources

About