Eulerian – Eulerian CFD model on fluidized bed gasifier using coffee husks as fuel

Ismail, Tamer M.; El-Salam, M. Abd; Monteiro, Eliseu; Rouboa, Abel

doi:10.1016/j.applthermaleng.2016.06.102

Cited by 68 publications

(15 citation statements)

References 47 publications

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“…The third peak Figure 4 allows us to conclude that BSG are perfectly integrated within the group of lignocellulosic biomasses with an H/C ratio of 0.14 and an O/C ratio of 1.25. Therefore, according to the Van Krevelen diagram, BSG have good thermal properties when compared with other biomass materials such as forest residues [39], eucalyptus [40], coffee husks [41], peach stone [42], and miscanthus [43]. These results of the chemical analysis of BSG are consistent with values reported in the literature [30,44,45].…”

Section: Thermogravimetric Analysis (Tga)supporting

confidence: 88%

Experimental Analysis of Brewers’ Spent Grains Steam Gasification in an Allothermal Batch Reactor

et al. 2019

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In this work, brewers’ spent grains (BSG) were evaluated and studied in order to obtain a combustible gas by means of allothermal steam gasification. BSG were preprocessed in a rotary dryer and a pelletizer prior to gasification in an indirectly heated batch reactor. BSG characterization was conducted by means of proximate, ultimate, and thermogravimetric analysis, allowing us to conclude that BSG have characteristics comparable to those of regular lignocellulosic biomasses. Gasification tests were performed in an allothermal bench-scale batch reactor in order to determine the effect of temperature and steam-to-biomass ratio (S/B) in the produced gas. The produced gas was mainly composed of 22.8–30.2% H2, 15.1–22.3% CO, and 7.2–11.1% CH4, contributing to a heating value of 8.11–9.0 MJ/Nm3 with the higher values found for a low S/B ratio and for high temperatures. The performance of the process was assessed by evaluating the cold gas and carbon conversion efficiencies. These indicators were found to be in the ranges 47.0%–52.1% and 57.0%–62.7%, respectively. The main conclusion of this work is that the produced gas obtained from BSG steam gasification has sufficient quality to open other options to beer producers to use their own brewing wastes to satisfy their energy needs, allowing them to progress toward the circular economy concept.

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Section: Thermogravimetric Analysis (Tga)supporting

confidence: 88%

Experimental Analysis of Brewers’ Spent Grains Steam Gasification in an Allothermal Batch Reactor

et al. 2019

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“…The results show that the moisture content value in CCF is higher than the data presented by several authors [38,[41][42][43]. Also, CHF volatile matter content is higher in comparison with the values reported in literature [35][36][37]. On the other hand, ash, fixed carbon percentages, and calorific value lower of CHF are lower than the values reported in literature [35-37, 41, 43-45].…”

Section: Natural Fibers Characterizationcontrasting

confidence: 57%

Recycled Polypropylene-Coffee Husk and Coir Coconut Biocomposites: Morphological, Mechanical, Thermal and Environmental Studies

Hidalgo-Salazar¹,

Correa-Aguirre²,

Montalvo-Navarrete³

et al. 2020

Thermosoftening Plastics

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In this work, biocomposites based on recycled polypropylene (r-PP) and two different natural fibers (coffee husk-CHF and coconut coir-CCF fibers) were prepared using extrusion and injection molding processes. Also, the addition of maleated polypropylene (MAPP) as a coupling agent on the biocomposites was explored. Recycled polypropylene and its biocomposites were tested following ASTM standards in order to evaluate tensile and flexural mechanical properties. Also, thermal behavior and the morphology of these materials have been studied by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and scanning electronic microscopy (SEM). The experimental results showed that the addition of CHF and CCF to the r-PP resulted in an increase in the flexural modulus and thermal properties of the composites but resulted in poor impact properties. Thermal characterization showed that CHF possesses a better thermal stability compared to CCF. However, both fibers act as nucleating agents and generate an increase in the thermal stability of the r-PP phase. Finally, it was observed that addition of 4% of MAPP significantly improved the mechanical strength and impact behavior of the biocomposites. Regarding environmental issues, a cradle to gate life cycle assessment was made in order to define the carbon footprint of the materials.

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“…One thing could be observed that not all researchers have calculated CH 4 in their research keeping the similar assumption of a negligible amount of CH 4 . The obtained value of CH 4 from literature is almost less than 1.5% which has very less share in the overall heating value as compared to very high mole % of CO and H 2 (Couto et al, 2015;Ismail et al, 2016 Figure 10. Comparison of the results of important syngas components from the present study with literature.…”

Section: Effect Of Oxygen/fuel Ratio On Syngas Qualitymentioning

confidence: 88%

Numerical simulation of lignocellulosic biomass gasification in concentric tube entrained flow gasifier through computational fluid dynamics

Maitlo

Unar

Mahar

et al. 2019

Energy Exploration & Exploitation

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Thermochemical conversion of biomass is an encouraging way for the production of syngas. In the present research, four different biomass materials were used for gasification which includes rice husk, cotton stalks, sugarcane bagasse, and sawdust. These biomass sources were selected because they are common Pakistani feedstocks. Gasification of selected biomasses was performed using concentric tube entrained flow gasifier. Three-dimensional computational fluid dynamics model was used to investigate the impacts of kinetic rate and diffusion rate on the gasification performance. The Euler-Lagrange method was used for the development of entrained flow biomass gasifier using commercial computational fluid dynamics code ANSYS FLUENT V R 14. Discrete phase model was used to predict the movement of particles, whereas the gas phase was treated as the continuous phase with a standard k-e turbulent model to predict the behavior of gas phase flow. Finite rate/Eddy dissipation model was applied for the calculation of homogenous and heterogeneous reaction rates. Oxygen was used as a gasifying agent. Cotton

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Eulerian – Eulerian CFD model on fluidized bed gasifier using coffee husks as fuel

Cited by 68 publications

References 47 publications

Experimental Analysis of Brewers’ Spent Grains Steam Gasification in an Allothermal Batch Reactor

Experimental Analysis of Brewers’ Spent Grains Steam Gasification in an Allothermal Batch Reactor

Recycled Polypropylene-Coffee Husk and Coir Coconut Biocomposites: Morphological, Mechanical, Thermal and Environmental Studies

Numerical simulation of lignocellulosic biomass gasification in concentric tube entrained flow gasifier through computational fluid dynamics

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