Biomass char particle surface area and porosity dynamics during gasification

Wu, Ruochen; Beutler, Jacob; Price, Cameron; Baxter, Larry

doi:10.1016/j.fuel.2019.116833

Cited by 40 publications

(10 citation statements)

References 52 publications

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“…SCB had a heterogeneous morphology (Figure a) with two main particle groups: fibers, which were long (hundreds of microns) particles composed of lignified cell wall layers, and the pith, which were smaller less dense spherical particles. , The pyrolysis process did not change the biomass morphology (Figure b, fiber and pith remained), as has also been observed for poplar char, but reduced the average particle size from 793 to 100 μm. The image in Figure b is of a char sample prepared at 750 °C, but all the char samples had similar morphologies and size distributions, regardless of the pyrolysis temperature (i.e., 750–900 °C).…”

Section: Resultsmentioning

confidence: 62%

CO₂ Gasification of Sugarcane Bagasse Char: Consideration of Pyrolysis Temperature, Silicon and Aluminum Contents, and Potassium Addition for Recirculation of Char

et al. 2020

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In sugarcane bagasse gasification, char recirculation to the gasifier improves syngas quality and process efficiency. To determine the effect of char properties on reaction kinetics, in this work the pre-gasification pyrolysis temperature, particle size, and catalyst (potassium) loading were varied. Char samples were prepared at 750-900 °C via pyrolysis and gasified isothermally in a thermogravimetric analysis unit at 850 °C with CO2, and gasification data was modeled using the random pore and extended random pore models. Increasing pyrolysis temperatures did not affect char morphology and surface composition but did reduce the surface area as determined by N2 adsorption, decreasing initial gasification rates and the overall fitted rate constants. Reduction of the particle size via ball milling decreased the time required for complete conversion and changed the shape of the rate versus conversion curves from monotonically decreasing to concave down. The char sample prepared via pyrolysis at 900 °C was an exception, having a maximum rate at ~10% conversion without ball milling. After ball milling of the char sample prepared at 750 °C, there was an accumulation of ash (Al and Si) on the surface of the particles and a reduction in the surface area, consistent with the ash blocking pores -the porosity in these samples increased during the initial stages (up to ~20% conversion) of gasification. The gasification behavior was generally well modeled by the extended random pore model. Although the addition of KOH (K/Al mass ratio ~ 0.2-1.25) enhanced the gasification rates, too much Kfrom the addition of KOH or after 90% conversion -created mass transfer limitations resulting in lower gasification rates.

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Section: Resultsmentioning

confidence: 62%

CO₂ Gasification of Sugarcane Bagasse Char: Consideration of Pyrolysis Temperature, Silicon and Aluminum Contents, and Potassium Addition for Recirculation of Char

et al. 2020

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“…In addition, the refining processes in the biorefineries have been especially supported by energy management and environmental control systems to produce sustainable fuel additives such as DMF and HMF (Hoang et al, 2020). Thus, achievements in the production of alternative fuels from waste sources (such as biomass and waste) and strategies to optimize combustion in internal combustion engines have brought expectations in the development of a green transport system at the port (Wu et al, 2020) (Veza et al, 2022).…”

Section: Typical Energy Management Models Of Typical Smart Portsmentioning

confidence: 99%

Technical-Environmental Assessment of Energy Management Systems in Smart Ports

Nguyen

Pham

Bui

2022

Int. J. Renew. Energy Dev.

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Shipping is facing huge pressure problems in this 21st century such as climate change and environmental pollution and the depletion of energy resources. Seaports are an important component of the shipping industry architecture. Although there is no common solution, seaports around the globe face the same challenge. Challenges raised include difficulties in integrating new technology into automation, traffic congestion, harmonizing residential communities around the port, quantifying and reducing CO2 emissions as well as planning for the energy transition. In addition, improving the adaptability of the port infrastructure in the context of increased pressure from market demand, labor shortage, and escalating prices should be considered. In that context, a smart port was born as a necessity. However, the understanding of smart ports is very limited. This review examines the recently published smart port literature to clarify the common concepts of smart ports and their development progress on the way to building a sustainable seaport ecosystem. Although smart port metrics and key port performance metrics are organized around four key performance areas including operations, environment, energy, and safety. However, a comprehensive review of all four key areas is very broad and difficult to cover in a review article. Therefore, this work focuses on analyzing and discussing the approaches and applications of the technology in smart port energy management systems. Our research has shown that different smart port founding perspectives play a decisive role in technology approaches to building a port energy management system including optimizing algorithms for energy consumption, balancing demand and energy production, and comprehensively integrating renewable energy. New findings in this study contribute to the elucidation of smart port concepts based on improving energy use and management efficiency with innovative technologies in the context of sustainable development of the shipping industry.

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“…CO 2 gasification reaction occurs mainly over the micropores which act as active sites. Higher the number of active sites on the surface, the higher is the reaction rate [15] . Earlier studies also reveal that the presence of alkali and alkaline earth metals (AAEMs) favor the gasification reaction to a large extent [16,17,18] .…”

Section: Introductionmentioning

confidence: 99%

Effect of Char Temperature on CO₂ Gasification of High Ash Coal and Biomass

et al. 2022

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Information on comparative gasification reactivity of high temperature chars in CO 2 with high ash coal (C), sawdust (SD) and rice husk (RH) under identical condition is important for clean energy development drive particularly in countries like India, where energy matrix is dominated by coal and introduction of larger quantity of biomass in energy-mix is attracting global interests. Therefore, TGA-studies on chargasification reactivity using CO 2 as a gasifying agent were performed at temperatures 850-1000 °C. In case of coal and RH-chars, CO 2 reactivity found to increase with increasing the BET surface area and reverse trend was observed with SD-chars. Both the biomass-chars showed increased specific micro pore surface area with increasing char preparation temperature through t-plot analysis, still keeping unusual behavior of CO 2 reactivity of SD-char unexplained. The estimations indicating the presence of catalytically active alkali and alkaline earth metals in substantial quantity is only important criteria found to explain the decreasing trend of gasification reactivity of SDchar prepared at various temperatures despite the increase in surface area. Catalytic activity of the components decreases with the rise in char preparation temperature. Kinetic analysis reveal that activation energy values of SD-chars varied in the range123-182 kJ mole À 1 , whereas those for coal-and RH-chars remained in the range 204-214 kJ mole À 1 .

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Biomass char particle surface area and porosity dynamics during gasification

Cited by 40 publications

References 52 publications

CO₂ Gasification of Sugarcane Bagasse Char: Consideration of Pyrolysis Temperature, Silicon and Aluminum Contents, and Potassium Addition for Recirculation of Char

CO₂ Gasification of Sugarcane Bagasse Char: Consideration of Pyrolysis Temperature, Silicon and Aluminum Contents, and Potassium Addition for Recirculation of Char

Technical-Environmental Assessment of Energy Management Systems in Smart Ports

Effect of Char Temperature on CO₂ Gasification of High Ash Coal and Biomass

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Biomass char particle surface area and porosity dynamics during gasification

Cited by 40 publications

References 52 publications

CO2 Gasification of Sugarcane Bagasse Char: Consideration of Pyrolysis Temperature, Silicon and Aluminum Contents, and Potassium Addition for Recirculation of Char

CO2 Gasification of Sugarcane Bagasse Char: Consideration of Pyrolysis Temperature, Silicon and Aluminum Contents, and Potassium Addition for Recirculation of Char

Technical-Environmental Assessment of Energy Management Systems in Smart Ports

Effect of Char Temperature on CO2 Gasification of High Ash Coal and Biomass

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CO₂ Gasification of Sugarcane Bagasse Char: Consideration of Pyrolysis Temperature, Silicon and Aluminum Contents, and Potassium Addition for Recirculation of Char

CO₂ Gasification of Sugarcane Bagasse Char: Consideration of Pyrolysis Temperature, Silicon and Aluminum Contents, and Potassium Addition for Recirculation of Char

Effect of Char Temperature on CO₂ Gasification of High Ash Coal and Biomass