TG–GC–MS study of volatile products from Shengli lignite pyrolysis

He, Qiang; Wan, Keji; Hoadley, Andrew; Yeasmin, Hasina; Miao, Zhenyong

doi:10.1016/j.fuel.2015.04.043

Cited by 100 publications

(42 citation statements)

References 52 publications

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“…The main sources of the organics in the wastewater are therefore from the small hydrogen-rich molecules in the lignite macromolecular structure [33,36]. Apparently, SL being a higher rank than LY, during heating to 240°C or below there is very little release of organics as is also shown from a previous study [31]. In cases like LY, these small organic molecules are embedded as a "mobile phase" [36,37] in the lignite matrix and researchers postulated different types of possible physical cross-link interactions: (1) π-π interactions between aromatic rings [38]; (2) hydrogen bond (H-bond) [36,39]; (3) electrostatic interactions [38,40].…”

Section: High Toc In Ly Wtmte Wastewatersupporting

confidence: 61%

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A comparison of acid treatment in the dewatering of Chinese and Australian lignites by mechanical thermal expression at high temperatures

Yeasmin

Miao

et al. 2016

Fuel Processing Technology

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Section: High Toc In Ly Wtmte Wastewatersupporting

confidence: 61%

“…During lignite pyrolysis, the alkyl-oxygen bond (C al -O) and alkylalkyl bond (C al -C al ) bonds are relatively easy to cleave at about 360°C and 430°C [30,31]. It can be postulated that below 240°C the energy is not sufficient to get either the C al -O or C al -C al bonds cleaved [32][33][34][35].…”

Section: High Toc In Ly Wtmte Wastewatermentioning

confidence: 99%

A comparison of acid treatment in the dewatering of Chinese and Australian lignites by mechanical thermal expression at high temperatures

Yeasmin

Miao

et al. 2016

Fuel Processing Technology

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“…In this temperature range, the permeability increases with increasing temperature. This is because as the temperature increases, the moisture and some volatile components are exuded [32][33][34][35]. This phenomenon can be confirmed by the offgas in the outlet.…”

Section: Relationships Between Lignite Permeability and Tem-mentioning

confidence: 77%

Effect of Temperature on Permeability and Mechanical Characteristics of Lignite

Shao

Meng

et al. 2016

Advances in Materials Science and Engineering

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Underground in situ pyrolysis and gasification is an important method to enable clean utilization of lignite in China. In this study, using the high-temperature triaxial permeability test equipment for different ranges of temperature and pore pressure, the permeability and mechanical characteristics of lignite from the Pingzhuang Mine Area in Chifeng have been examined. The results show that, at constant confining pressure, the elastic modulus of lignite decreases with increasing temperature. For temperature up to approximately 75°C, the elastic modulus is close to the modulus under the uniaxial state. As the temperature increases, the stress-strain curves during loading and unloading are different. The differences between the curves during loading and unloading are greater at higher temperature due to the greater residual deformation. In addition, in different temperature ranges (i.e., 150–650°C), the triaxial creep curves of lignite are different. In particular, at 300–450°C, the triaxial creep curve of lignite alternates between the accelerated creep and the steady creep. Moreover, the permeability change rule in the lignite is complex, and it is governed by the temperature and pore pressure. Hence, for different temperature range and pore pressure, the variations in the permeability are different. In fact, as the temperature increases, the permeability of lignite fluctuates.

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“…The C‐O structures included two kinds of sub structures, namely, Car‐O and Cal‐O. Cal‐O would break before the Cal‐Cal breakage (the breakage of the aliphatic chain) and the Car‐O would break after the Cal‐Cal breakage . These C‐O structures (including those that were newly generated and those that had initially existed) could lead to a relatively large

σ_{E 1}

of the SH and XM, thus exhibiting a broad primary pyrolysis peak.…”

Section: Resultsmentioning

confidence: 99%

“…The cracking of tar‐O is the main source of CO produced from the SH. The XM was lignite with numerous oxygen‐containing functional groups, and the main reaction at this temperature may be the decomposition of heterocyclic compounds . To summarize, the composition of the reactions at this temperature was complex and differed among the coal samples.…”

Section: Resultsmentioning

confidence: 99%

Pyrolysis characteristics of low‐rank coals based on double‐gaussian distributed activation energy model

et al. 2019

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Pyrolysis is an important technology in the utilization of low-rank coals (LRCs) and is a prerequisite stage for other conversion methods. This study aimed to develop an understanding of the pyrolysis process of LRCs, especially the relationship between the pyrolysis kinetics and the internal chemical structure. The chemical structure parameters of all of the samples were obtained using the Fourier transform infrared spectroscopy (FTIR) method. Thermogravimetric (TG) experiments were conducted at different heating rates (5, 10, and 20 K/min), and the experimental results were fitted using the distributed activation energy model (DAEM). DAEM based on double-Gaussian distribution (2G-DAEM) exhibited an acceptable fit to the experimental data in this study. An analysis of the chemical structure parameters of the four types of coals and the kinetic model obtained by fitting indicated that the difference in the chemical structure parameters among the coal samples could effectively explain the difference in the pyrolysis process and the activation energy distribution. The primary pyrolysis stage of the coal samples, including the thermal hysteresis effect caused by the increase in the heating rate, was accurately described by the 2G-DAEM in this study.

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TG–GC–MS study of volatile products from Shengli lignite pyrolysis

Cited by 100 publications

References 52 publications

A comparison of acid treatment in the dewatering of Chinese and Australian lignites by mechanical thermal expression at high temperatures

A comparison of acid treatment in the dewatering of Chinese and Australian lignites by mechanical thermal expression at high temperatures

Effect of Temperature on Permeability and Mechanical Characteristics of Lignite

Pyrolysis characteristics of low‐rank coals based on double‐gaussian distributed activation energy model

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