Production of bio-syngas and bio-hydrogen via gasification

Bermúdez, J.M.; Fidalgo, Beatriz

doi:10.1016/b978-0-08-100455-5.00015-1

Cited by 35 publications

(24 citation statements)

References 115 publications

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“…The finely ground plastics at a temperature of 25 • C under atmospheric pressures of 1 atm are transferred to a gasification reactor unit with (assumed) steam temperature of 850 • C and pressure of 1 bar employed as the gasifying media at a steam to feed ratio of 5 (assumed) [34]. The gasification reaction, is undertaken at temperature of 1200 • C for enhanced formation of only (light) hydrocarbons, CO 2 , CO and H 2 molecules [35,36]. A high yield of H 2 gas is anticipated due to the water-gas shift reaction that occurs during steam gasification [37].…”

Section: Model and Process Descriptionmentioning

confidence: 99%

Comparative Assessment of Thermo-Syngas Fermentative and Liquefaction Technologies as Waste Plastics Repurposing Strategies

Okoro

Faloye

2020

AgriEngineering

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The present study comparatively investigates the potential of waste plastic utilization as a feedstock for the production of liquid fuels to satisfy the rising liquid fuel demands of the transportation industry while simultaneously resolving the global plastic waste pollution challenge. For the first time, therefore, conceptual models simulating the production of transportation fuels of ethanol and gasoline from waste plastics via the technologies of thermo-syngas fermentation and hydrothermal liquefaction were assessed using classic technoeconomic assessment methods. The conceptual models were developed based on existing experimental data as obtained from the literature and simulated using ASPEN Plus as the preferred process simulation tool. This study demonstrated the technical viability of both conversion pathways with the hydrothermal liquefaction (HTL) of waste plastics for gasoline production shown to constitute a more economically preferable pathway. This was because the HTL of waste plastics presented a higher internal rate of return (IRR) value and a lower unit processing cost of 51.3% and USD 0.38 per kg compared to the thermo-syngas fermentation pathway that presented an IRR value and a unit processing cost value of 22.2% and USD 0.42 per kg, respectively. Payback periods of 5 years and 2 years were also determined as vital to recoup initial capital invested in the thermo-syngas fermentation project and the HTL project, respectively. Therefore, this study provides a basis for further work regarding waste plastic management strategies while offering a useful guide for policy makers in determining the most cost-effective way to utilize waste plastic and thus promote favorable environmental outcomes.

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Section: Model and Process Descriptionmentioning

confidence: 99%

Comparative Assessment of Thermo-Syngas Fermentative and Liquefaction Technologies as Waste Plastics Repurposing Strategies

Okoro

Faloye

2020

AgriEngineering

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“…-The direct conversion of raw human feces using existent thermal technologies. Even though the high physical exergy of the process shows a possibility to bring the moisture content to acceptable levels [23,39,47,48], the direct conversion dealing with high water content is still a challenge. In this context, the concept of waste heat recovery must be addressed [49].…”

Section: Conclusion and Future Perspectivementioning

confidence: 99%

Thermodynamic assessment of human feces gasification: an experimental-based approach

et al. 2019

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Residues with a large amount of organic content represent a potential for energy recovery. Specifically human feces, given the amount of global production and the environmental appeal, appear as a potential candidate for a new feedstock. The objective of this work is to perform a thermodynamic assessment of human feces gasification considering for the first time all inefficiencies of a downdraft gasifier. A thermochemical characterization was conducted from the sterilized raw material to the products. New data and discussions about the conversion efficiencies for such type of fuel are brought up, such as the influence of the exothermic pyrolysis on the chemical exergy destruction. The results suggest an unfavorable application in energetic terms; however, when the exergy analysis is added with the environmental bias, the process becomes more attractive due to the high physical exergy.

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“…Higher gasification operating temperatures (≥800°C) is recommended for tar reduction, although, this can favor the formation of slag from ash agglomeration. [13]. The exit gas temperature from the gasifier can vary between 200-700°C [10], while the ideal gas temperature for its usage in internal combustion engines should be around room temperature [14].…”

Section: Introductionmentioning

confidence: 99%

Gas yield variation in wood biomass co-current air gasification process – continuous operation

et al. 2020

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The purpose of this work was to study the gas yield variation resulted from the cherry wood gasification with air using a lab-scale rotary kiln gasifier. The feedstock was continuously fed into the preheated reactor at 600°C, in co-current configuration, using atmospheric air as a gasifying agent. The results indicate the importance of oxidation reaction control, through the feeding flow rates of biomass and air and the reactants mixing rate. From the experiment, the hydrogen yields were about 2-4%, while the carbon monoxide varied between 8-21%. Additionally, the paper provides process observations based on the continuous monitoring of gas composition. The specific flow rates of substances and installation operating conditions were linked to process run through syngas composition.

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Production of bio-syngas and bio-hydrogen via gasification

Cited by 35 publications

References 115 publications

Comparative Assessment of Thermo-Syngas Fermentative and Liquefaction Technologies as Waste Plastics Repurposing Strategies

Comparative Assessment of Thermo-Syngas Fermentative and Liquefaction Technologies as Waste Plastics Repurposing Strategies

Thermodynamic assessment of human feces gasification: an experimental-based approach

Gas yield variation in wood biomass co-current air gasification process – continuous operation

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