Kinetics of woodchips char gasification with steam and carbon dioxide

Ahmed, Islam; Gupta, Ashwani K.

doi:10.1016/j.apenergy.2010.11.007

Cited by 172 publications

(114 citation statements)

References 13 publications

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“…This may be due to the change in active surface sites of WPB during gasification process. It was proposed that as progressing of gasification, a geometrical change in char pore structure can be occurred which affects the reaction rate [5]. The fact that gasification kinetic of WPB was ERPM also supports above results.…”

Section: Gasification Ratesupporting

confidence: 73%

“…In the case of chars from woody biomass, reactivities decreased with increasing conversion, similar to those of chars reported in literature [5,8,12,24,34]. It was postulated that the catalytic action varies during conversion owing to the chemical occurrence of the catalysts (for example, deactivation resulting from sintering and agglomeration) and char structure [17].…”

Section: Gasification Ratesupporting

confidence: 67%

“…Ollero et al studied the CO 2 gasification kinetics of olive residue using the Langmuir Hinshelwood model [3]. Gupta et al studied reaction rates of woodchips char gasification with using the random pore model [5]. Among these models, random pore model has often shown satisfactory agreement between theory and experiment, which considers the effects of pore growth and coalescence during reaction.…”

Section: ) Biomass → Volatiles + Charmentioning

confidence: 99%

“…Although the model has received great successes in modeling gasification reactions of coal chars [5][6][7], it sometimes fails to describe the reactivity profiles of biomass chars, in which the reactivity increases with increasing conversion or exists a maximum in high conversion range. Two parameters were added in the random pore model to take inorganic element contents into account by Struis et al Modified random pore model has been recently used to investigate reactivity of biomass chars with fitting the experimental data [8][9][10].…”

Section: ) Biomass → Volatiles + Charmentioning

confidence: 99%

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The effect of char properties on gasification reactivity

Duman

Uddin

Yanık

2014

Fuel Processing Technology

104

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In this study, CO 2 gasification of raw and acid-washed chars obtained from various types of lignocellulosic biomasses (woody and agricultural waste biomasses) was studied under isothermal conditions (850°C) using thermal gravimetric analysis. The effect of surface area and alkali/earth alkali metals on the reactivity of the chars was investigated. The different kinetic models were used to fit with the reactivity data by using least square method. The gasification of chars with higher surface area was found to be faster than that of chars having lower surface area. The acid treatment decreased the overall gasification rate for each raw chars. However, although the AI (alkali index) values of chars obtained from agricultural biomasses had equal or higher than that of woody biomass chars, their initial rates were considerably lower. It was concluded that indigenous alkali metals of chars have a remarkable influence of gasification reactivity but an adequate surface area should be provided to react with CO 2 .

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Section: Gasification Ratesupporting

confidence: 73%

Section: Gasification Ratesupporting

confidence: 67%

Section: ) Biomass → Volatiles + Charmentioning

confidence: 99%

Section: ) Biomass → Volatiles + Charmentioning

confidence: 99%

See 2 more Smart Citations

The effect of char properties on gasification reactivity

Duman

Uddin

Yanık

2014

Fuel Processing Technology

104

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“…Steam gasification of sewage sludge increased the hydrogen yield three-fold compared with air gasification (Nipattummakul et al 2010). Finally, Ahmed and Gupta (2011) gasified woodchip chars with steam and CO2. The reactor temperature was maintained at 900 °C, and the partial pressures of the gasifying agents ranged from 1.5 to 0.6 bar.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Reaction Behavior of Albizia gummifera Wood under Steam Gasification with Varied Partial Pressures and Gasification Temperatures

Oluoti¹,

Richards²

2016

BioResources

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The astronomical increase in global energy demand makes locating energy sources other than fossil fuels worthwhile. The use of tropical biomass wood waste as a renewable energy source was investigated in this study. The thermal conversion analysis of Albizia gummifera (ayinre) was carried out in a thermobalance reactor via steam gasification under varying temperature (700 to 1000 °C) and steam partial pressure (0.020 to 0.050 MPa). The experimental data was evaluated using three gas-solid reaction models. The modified volume reaction model (mVRM) gave the overall highest coefficient of determination (0.9993) and thereby the best conversion prediction. The observed char activation constant rates (from paired reaction conditions) indicated, on average, an increase in reactivity as the parameters increased. The results showed that the activation energy of the mVRM gave the lowest value (32.54 kJ/mol) compared with those of the shrinking core model (SCM) and the volume reaction model (VRM) (49.29 and 49.89 kJ/mol, respectively).

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Waste and Biomass to Clean Energy

Gupta

2015

Handbook of Clean Energy Systems

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Waste and biomass include different kinds of organic and inorganic materials including wood, trees, agricultural, municipal, medical, hazardous, electronic, industrial solid wastes, and waste glass, metals, and plastics. Waste is a growing problem to the society worldwide. Increased waste production is directly related to increased gross domestic product ( GDP ) so that one must seek options for their safe and environmentally benign disposal. The old practice of landfills, although still in use in many countries, is less acceptable as this causes odors and nuisance to the nearby community and can be leachable to ground water. Thermal destruction and incineration is now widely used as it provides energy recovery (both thermal and electricity), mass and volume reduction of the waste, and the remaining residue can be used for construction material or discarded at landfills. Pyrolysis and gasification offers clean reforming of wastes to syngas, which can also be converted into liquid fuels. Much of the work on gasification of wastes is at the laboratory scale so that the favorable results obtained can be used at pilot‐ and demonstration‐scale plants, akin to coal gasification plants. Waste and biomass can also be converted into useful clean refuse‐derived fuel and value added products of activated carbon and torrefied material. It is expected that the fundamental information on pyrolysis and gasification provided here will assist in the design and operation of advanced gasifiers with eliminated tars and char. The reforming of wastes to useful materials and value added products provide clean energy to support energy sustainability.

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Kinetics of woodchips char gasification with steam and carbon dioxide

Cited by 172 publications

References 13 publications

The effect of char properties on gasification reactivity

The effect of char properties on gasification reactivity

Investigation of the Reaction Behavior of Albizia gummifera Wood under Steam Gasification with Varied Partial Pressures and Gasification Temperatures

Waste and Biomass to Clean Energy

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