The effect of coal particle size on pyrolysis and steam gasification

Hanson, Svenja; Patrick, John W.; Walker, Alan

doi:10.1016/s0016-2361(01)00153-3

Cited by 88 publications

(36 citation statements)

References 8 publications

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“…Characterization of Coals by 13 C CP/TOSS NMR. 13 C CP/TOSS NMR analyses were performed for LL, FG, and HLE coal to examine their chemical structures. Figure 1 presents the 13 C CP/TOSS NMR spectra of the three coal samples.…”

Section: Resultsmentioning

confidence: 99%

Impact of the Temperature, Pressure, and Particle Size on Tar Composition from Pyrolysis of Three Ranks of Chinese Coals

et al. 2014

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Tar compositions from pyrolysis of three ranks of Chinese coals of Hailaer lignite, Fugu sub-bituminous coal, and Liulin bituminous coal under different temperatures and pressures were analyzed via a pyrolyer combined with gas chromatography/mass spectrometry (Py−GC/MS). A nuclear magnetic resonance (NMR) analysis was performed to characterize the coals. It was found that the relative content of polycyclic aromatic hydrocarbons (PAHs) is not as sensitive to temperature as monocyclic aromatic hydrocarbons (MAHs), which increased with increasing the pyrolysis temperature. A decreasing trend of the content of acids/esters was observed for all three ranks of coals. However, the three coals exhibited quite different trends with the temperature in terms of the relative content of aliphatic hydrocarbons. MAHs and PAHs were predominant components in the tar from Liulin bituminous coal. The tars from Hailaer lignite and Fugu sub-bituminous coal were rich in phenolics, which can be detected at a low temperature of 400°C. In contrast, the phenolics were much less in the tar from Liulin bituminous coal and can merely remarkably be detected at a higher temperature of 600°C. The contents of phenolics and aliphatic hydrocarbons decreased with increasing the pressure for all three coals, and the contents of MAHs and PAHs showed inverse trends with the pressure. This could result from the enhanced reactions of cyclizations of aliphatics and scissions of the C−OH bond in phenolics by elevated pressure. C 19 alkane and p-cresol as model compounds of aliphatics and phenolics were pyrolyzed under high pressures to verify this point. For a larger particle size of Fugu sub-bituminous and Liulin bituminous coals, the contents of aliphatics decreased remarkably, while the contents of MAHs and PAHs were distinctly augmented. This could be attributed to the intraparticle secondary reactions.

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Section: Resultsmentioning

confidence: 99%

Impact of the Temperature, Pressure, and Particle Size on Tar Composition from Pyrolysis of Three Ranks of Chinese Coals

et al. 2014

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“…Particle size outside of this specific size range led to a decrease to different degrees in the tar yield. This could be explained by that the influence of the particle size on lignite pyrolysis is mainly manifested in heat transfer within particles and the secondary reactions of volatiles inside the particles [12]. But for DLR, in addition, the effect of the particle size was also reflected in the mass transfer process.…”

Section: Optimization Of Co-pyrolysis Conditionsmentioning

confidence: 99%

Co-pyrolysis of lignite and Shendong coal direct liquefaction residue

Xue

Feng

et al. 2015

Fuel

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“…Their results showed that differences among pyrolysis pressures, as determined by SEM microscopy, were not consistent with the specific surface areas of the samples as measured by N 2 -BET analysis because of secondary pyrolysis and tar readsorption. Hanson et al [10] indicated that different coal-size fractions had different influences on pyrolysis because smaller coal particles could easily aggregate larger char particles, but larger ones had a greater tendency to crack into smaller fragments. In order to determine coal structures and quantify chemical functional groups, FTIR spectroscopy is thought to be one of the best analytical techniques, by which the abundance of chemical functional groups, such as AOH, aliphatic and aromatic ACH, and carboxylic ACOOH groups could be identified [11].…”

Section: Introductionmentioning

confidence: 99%

Comparative study on structural properties and combustion kinetics of Chinese Shenhua long flame raw coal and its pyrolytic char

Wang

Song

Zhou

et al. 2017

Env Prog and Sustain Energy

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Research on the structural and combustion properties of coal is of great importance for its conversion and applications in view of fundamental studies. In this work, we conducted the first detailed study on the structural properties and combustion kinetics of Chinese Shenhua raw coal (RC) and its pyrolytic char (PC). The combustion kinetics was simulated by using the random pore model (RPM). The results showed that RC and PC were composed of both a plant‐cell‐like structure and a discrete particulate structure. In addition, PC had a larger specific surface area, finer particles, higher aromaticity, and higher degree of aromatic ring condensation than those of RC. Combustion of PC showed higher ignition temperature, lower burnout temperature, and a higher combustion index compared to RC. A high correlation coefficient R2 (0.999) and a low average error θ (0.008) were obtained using the RPM. The combustion apparent activation energy E and the structural parameter ψ of RC were 40.30 kJ mol−1 and 0.53, respectively. For PC, the values of E and ψ were estimated to be 60.01 kJ mol−1 and 0, respectively. © 2017 American Institute of Chemical Engineers Environ Prog, 36: 766–774, 2017

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The effect of coal particle size on pyrolysis and steam gasification

Cited by 88 publications

References 8 publications

Impact of the Temperature, Pressure, and Particle Size on Tar Composition from Pyrolysis of Three Ranks of Chinese Coals

Impact of the Temperature, Pressure, and Particle Size on Tar Composition from Pyrolysis of Three Ranks of Chinese Coals

Co-pyrolysis of lignite and Shendong coal direct liquefaction residue

Comparative study on structural properties and combustion kinetics of Chinese Shenhua long flame raw coal and its pyrolytic char

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