Petrographic composition of the ex-situ lignite gasification residues

Bielowicz, Barbara; Raszowski, Michał; Maciejończyk, Natalia

doi:10.1080/15567036.2018.1549153

Cited by 1 publication

(4 citation statements)

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“…Morphotypes constituting the studied char are typical products of lignite gasification, as lignite usually generates network-type to solid char structure [31,89]. Morphology of the chars derived from the low rank coals closely reflects coal maceral composition [24].…”

Section: Morphotypementioning

confidence: 94%

“…During gasification it acts as a reactive component and produces substantial amounts of tar and gas, while its porosity increases [16]. Textinite belongs to the macerals, which are most heavily altered [31] but its primary cellular structure is frequently preserved [29]. Therefore, mostly thin-walled network (i.e., tenuinetwork) comes into being.…”

Section: Morphotypementioning

confidence: 99%

“…Ulminite produces greater amount of char than textinite during carbonization [97,98]. It accounts for the largest part of unchanged macerals during gasification [31]. Moreover, ulminite does not change its shape, and its porosity does not increase substantially [29].…”

Section: Morphotypementioning

confidence: 99%

“…Furthermore, the importance and role of individual macerals in the gasification process was highlighted [5,12,[20][21][22][23][24]. The petrographic features of chars obtained by the gasification process were also investigated [12,[24][25][26][27][28][29][30][31]. The evolution of char structure can be characterized by coal petrography, in particular, the percentage char determination [27].…”

Section: Introductionmentioning

confidence: 99%

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Raman Spectroscopy of Lignite Gasification Char Morphotypes

Morga

Bielowicz

2022

Energies

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The purpose of this study is to characterize and compare the microstructural features of the main morphotypes occurring in the char obtained at 850–950 °C by fluidized bed gasification of lignite from the “Szczerców” deposit (Central Poland), and to bring new insights into the knowledge on the origin of these morphotypes. Optical microscopy and Raman spectroscopy were used. The char is composed mostly of crassinetwork and inertoid, accompanied by tenuinetwork and small amounts of fusinoid. Tenuinetwork originates mainly from textinite, crassinetwork is formed from attrinite, while inertoid results from transformation of strongly gelified macerals such as densinite and ulminite. Similarities in the microstructure of tenuinetwork and crassinetwork as well as inertoid and fusinoid are observed. Inertoid and fusinoid are composed of larger aromatic systems, with lower amount of alkyl-aryl structures, and their microstructure is better organized compared to tenuinetwork and crassinetwork. Inertoid and fusinoid differ in microscopic appearance and were formed from different starting materials, but their microstructural properties converged during gasification. Different morphological features of the network morphotypes (tenuinetwork, crassinetwork) are not reflected in the differences in their microstructural characteristics.

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Section: Morphotypementioning

confidence: 94%