Pyrolysis of brown coal under different process conditions

Šafářová, Marcela; Kusý, Jaroslav; Anděl, Lukáš

doi:10.1016/j.fuel.2005.05.015

Cited by 44 publications

(27 citation statements)

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“…At high activation temperatures and employing proper activation medium, materials with extensive system of pores can be prepared from the semi-coke, which materials can be used in the area of environmental protection as adsorbents [1,5,20,[25][26][27][28]. Utilisation of such carbon-based materials in this area varies very much: from treatment/purification of various types of wastewater streams, purification of flue gas, separation of permanent gases or capture of carbon dioxide [3,24,29,[32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

“…The manner of use of these adsorbents depends considerably on the properties of these materials, whilst the critical properties are the specific surface area, distribution and shapes of the pores and the bulk weight [32]. Besides gas, the brown coal pyrolysis also generates liquid products; namely brown coal tar and pyro-genetic water [27]. The brown coal tar is a product that can serve as appropriate raw material for ensuing processing to arrive at much more noble products, such as motor fuels and oil hydrogenates, which are currently produced mainly from crude oil employing multiple technological processes.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogenation process of the tar obtained from the pyrolisis of brown coal

Kusý

Anděl

Šafářová

et al. 2012

Fuel

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrogenation process of the tar obtained from the pyrolisis of brown coal

Kusý

Anděl

Šafářová

et al. 2012

Fuel

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“…This can be strongly correlated with the structure of the coal, as characterized by NMR, which shows that the average aromatic cluster size in LL bituminous coal is 3 rings and the cluster size in both HLE lignite and FG subbituminous coal is no more than 2 rings. (4) The content of aliphatic hydrocarbons shows different trends with the pyrolysis temperature for the three coals. Alkanes and alkenes are predominant in aliphatics from FG sub-bituminous coal and HLE lignite.…”

Section: Resultsmentioning

confidence: 94%

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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“…Pyrolysis process is affected by pyrolysis temperature, pyrolysis time and other factors such as pressure, atmosphere, heating rate and mineral content, etc. [3][4][5][6]. Pyrolysis process is divided into three stages depending on the pyrolysis temperature [7].When coal particles are heated, initial thermal decomposition reaction inside the particles will produce volatiles and semi-coke.…”

Section: Introdutionmentioning

confidence: 99%

Evolution of Structure Properties during Zhundong Coal Pyrolysis

Zhang¹,

Zhu²

2015

Procedia Engineering

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Pyrolysis is the first stage reaction in the processes of coal thermochemical conversion. In this study, Zhundong coal is pyrolyzed in an electric heated horizontal tube furnace. The combustion and gasification of coal and char are affected by the surface area, pore structure and chemical factors. The structure properties of Zhundong coal and chars are characterized with X-ray diffraction (XRD), CO 2 adsorption isotherm, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM). XRD results indicate that, with pyrolysis temperature and time increasing, the stacking height (L c ) increases and then decreases, and the size of aromatic layer (L a ) of chars increases while the lattice plane spacing (d 002 ) almost stays unchanged. The specific surface area, pore volume, and average pore width are calculated, and the results show that the chars present more developed pore structure. FT-IR study reveals the presence of -OH, C=O, -CH, and C=C. The intensity of band of -OH group (3100-3600 cm -1 ), C=O group (1700 cm -1 ), C=C group (1600 cm -1 ), and C-H group (2800-3100 cm -1 ) decreases with the increase in the pyrolysis temperature and time. The above results indicate that the structure properties of chars are strongly dependent on heat treatment conditions, which is essential for the utilization of Zhundong coal.

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Pyrolysis of brown coal under different process conditions

Cited by 44 publications

References 1 publication

Hydrogenation process of the tar obtained from the pyrolisis of brown coal

Hydrogenation process of the tar obtained from the pyrolisis of brown coal

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

Evolution of Structure Properties during Zhundong Coal Pyrolysis

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