Impact of peripheral fragmentation on the steam gasification of an isolated wood charcoal particle in a diffusion-controlled regime

Golfier, Fabrice; Steene, Laurent Van de; Salvador, Sylvain; Mermoud, Floriane; Oltéan, Constantin; Buès, Michel

doi:10.1016/j.fuel.2009.02.043

Cited by 12 publications

(5 citation statements)

References 39 publications

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“…In other studies on the steam gasification of biochars (Wu et al, 2009;Ahmed and Gupta, 2010;Mermoud et al, 2006a;Yip et al, 2010;Golfier et al, 2009) pore surface area and reactivity of chars increased with conversion, while an opposite trend was observed for the steam gasification of coal chars (Wu et al, 2006;Liliedahl and Sjostrom, 1997;Xu et al, 2011).…”

Section: Estimate Of Kinetic Parameters For the Shrinking-core Modelmentioning

confidence: 81%

Steam gasification of a refuse derived char: Reactivity and kinetics

Kolaczkowski

2015

Chemical Engineering Research and Design

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a b s t r a c tA char was obtained from a commercial pilot-scale gasifier, which had been operating with a refuse derived fuel (RDF). Using this char, steam gasification experiments were then performed in a 15.6 mm i.d. packed bed tubular reactor. The effect of reaction temperature was studied (800 • C to 900 • C), and also the partial pressure of steam were in the range 33.3 kPa to 66.7 kPa. With the aid of the Shrinking-Core and the Uniform-Reaction models, kinetic parameters were estimated (apparent activation energy varied from 96 kJ mol −1 to 162 kJ mol −1 ). It was also found that at lower carbon conversions (e.g. 10% to 60%) the RDF-derived char appeared to be more reactive than other bio-chars reported in the literature. However, at higher conversions (>60%), its apparent reactivity decreased with carbon conversion, thereby behaving in a similar manner to chars derived from coal.

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Section: Estimate Of Kinetic Parameters For the Shrinking-core Modelmentioning

confidence: 81%

Steam gasification of a refuse derived char: Reactivity and kinetics

Kolaczkowski

2015

Chemical Engineering Research and Design

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“…In other words, internal diffusion resistance can be reduced after extraction. 25 Therefore, increasing the extraction yield can effectively improve the gasification reactivity of the residue. The mixed solvent of scCO 2 and NMP had a good extractability for hydroxyl-rich substances, such as alcohol, ester, ether, phenols, and ketones, and oxygen, sulfur, and other heteroatom-containing compounds.…”

Section: Resultsmentioning

confidence: 99%

“…Compared with the raw coals, the reaction gas diffuses more easily into the internal pore of the extracted residues. In other words, internal diffusion resistance can be reduced after extraction . Therefore, increasing the extraction yield can effectively improve the gasification reactivity of the residue.…”

Section: Results and Discussionmentioning

confidence: 99%

Evaluation of Coal Extraction with Supercritical Carbon Dioxide/1-Methyl-2-pyrrolidone Mixed Solvent

et al. 2014

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A novel coal extraction method using supercritical carbon dioxide (scCO 2 )/1-methyl-2-pyrrolidone (NMP) mixed solvent, which has the advantages of high efficiency, diffusibility, separability, and environmental friendliness, is proposed in this paper. The physical and chemical properties of the extracts and residues in scCO 2 /NMP mixed solvent extraction of coal were studied. The results showed that 8 bituminous coals had relatively higher extraction yields. The bituminous coal with 85.12% carbon content had the maximum observed extraction yield. The mixed solvent of scCO 2 and NMP had a good extractability for hydroxyl-rich substances, oxygen, sulfur, and other heteroatom-containing compounds. The extracts of Bei Su (BS) and Qu Jin (QJ) coals with higher extraction yields contained more aromatic ring structures. Studies of coal structure revealed that BET surface area of residues were generally lower than that of raw coals, especially for low-rank coals. After extraction, BET and pore volume declined whereas the pore size increased with increasing pressure. It could also be concluded that stacking heights of four coals (QJ, BS, Nan Lu Tian, and Yang Chang Wan) decreased after the extraction procedure. The degree of decline of NLT lignite was larger than that of other coals according to the carbon minicrystal research. A microcrystalline structure similar to raw coal was formed in the process of the solvent evaporation, with a lower stacking height and a higher interplanar spacing. The gasification reactivities of the four coals have been improved by the extraction with scCO 2 /NMP mixed solvent, especially for QJ and BS coals, which have high extraction yields.

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“…The purpose here is only to estimate external mass transfer for the boundary conditions. We are aware that advanced models (Golfier et al, 2009;Tilghman and Mitchell, 2013) took into account the evolution of particle diameter (e.g. for fragmentation, etc.)…”

Section: Presentation Of the Modelmentioning

confidence: 99%