A review on moisture re-adsorption of lignite treated using different drying techniques

Liu, Xiangchun; Li, Guoqing; Xie, Ruilun; Zhao, Zhigang; Cui, Ping

doi:10.1080/07373937.2020.1871007

Cited by 14 publications

(4 citation statements)

References 75 publications

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“…Gasification is considered to be a promising choice for the clean utilization of coal due to its high efficiency and flexibility [2] . Fluidized bed gasification technology with many technical advantages such as low gasification temperature, strong adaptability to coal, sulfur fixation and fewer nitrogen oxides, is one of the main methods and the widely concerned coal gasification [3] . However, it is also facing some problems.…”

Section: Introductionmentioning

confidence: 99%

Quantum chemical study on non-thermal plasma degradation tar in gasification syngas

Liang,

Li,

Kuang

et al. 2024

J. Phys.: Conf. Ser.

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The bond dissociation energies (BDEs) of benzene, toluene, and naphthalene which are the main components of tar in fluidized bed gasification syngas have been investigated by B3LYP method at 6-31G (d, p), 6-31G+ (d, p), 6-31G++ (d, p) and 6-311G++ (d, p) basis setsof density functional theory (DFT).The structures of benzene, toluene, naphthalene, and corresponding radicals were optimized, and their total energiesand zero-point energies (ZPE) were calculated.The frequency analysis was carried out, then, the transition state and the high order saddle were excluded, and the influence of zero point energy scaling factors was neglected.The results showed thatthe BDEs decreased with increasing computational basis sets. The calculated results obtained by B3LYP/6-31G (d, p) are much closer to the results of the documents than the other three basis sets. This indicates that the basis set of B3LYP/6-31G (d, p) is much more credible in reproducing the BDEs. The lowest electron energy values for the ring opening of benzene, toluene and naphthalene are 8.05 eV, 7.45 eV, and 7.35 eV, respectively, indicating that when the energy of high-energy electrons reaches 8.05 eV, the ring of aromatic hydrocarbon can be broken.

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Section: Introductionmentioning

confidence: 99%

Quantum chemical study on non-thermal plasma degradation tar in gasification syngas

Liang,

Li,

Kuang

et al. 2024

J. Phys.: Conf. Ser.

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“…29,33 The moisture-holding capacities of most HD lignite that upgraded at 250 C were still over 12%. 34 In addition, Yuan et al 35 recommended a higher upgrading temperature because the spontaneous combustion propensity was increased due to the development in pore structure when lignite was upgraded at a low temperature. Therefore, a new method was desired to promote the removal of moisture and oxygen from lignite.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, when the upgrading temperature was lower than 250°C, it was difficult to remove moisture from lignite via HD 29,33 . The moisture‐holding capacities of most HD lignite that upgraded at 250°C were still over 12% 34 . In addition, Yuan et al 35 recommended a higher upgrading temperature because the spontaneous combustion propensity was increased due to the development in pore structure when lignite was upgraded at a low temperature.…”

Section: Introductionmentioning

confidence: 99%

Combustion performance of lignite after efficient upgrading via deep eutectic solvent‐assisted hydrothermal dewatering

Huang

et al. 2023

Asia-Pacific J Chem Eng

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In order to increase the efficiency of hydrothermal dewatering (HD), a deep eutectic solvent (DES, synthesized by ChCl and ZnCl2) was employed to promote the removal of moisture and oxygen from lignite. The variation of physicochemical structure of upgraded coals greatly affected the combustion performance. The effects of addition amount of DES, upgrading temperature, and the molar ratio by ChCl and ZnCl2 on combustion performance of upgraded coals were analyzed via thermogravimetric analysis. Compared with HD lignite upgraded at 280°C, the combustion curves of DES‐HD lignite were shifted and delayed toward a higher temperature zone as DES additions increased. DES‐HD lignite had lower spontaneous combustion tendency and higher combustion reactivity. When upgrading temperature increased from 250 to 300°C, the combustion curves of lignite upgraded with 3.0‐g DES (ChCl:ZnCl2 = 1:1) first moved to the low‐temperature zone and then shifted to the high‐temperature zone. DES‐HD lignite maintained the advantages of raw coal in terms of combustion characteristics. For lignite upgraded with different molar ratios of ZnCl2 in DES, the difference in combustion behavior was mainly manifested in the burnout stage. The burnout stage was advanced slightly as the molar ratio of ZnCl2 increased.

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“…Lignite plays an increasingly important role in China’s energy supply due to its large reserves, high reactivity, and low mining cost. − It is also an important resource in the modern chemical industry. However, the high moisture content , of lignite reduces its combustion efficiency, increases CO 2 emission, and transportation cost, which restricts the large-scale utilization of lignite.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Moisture Transfer and Surface Crack Development of a Single Lignite Particle Driven by Humidity Difference

et al. 2021

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The research on moisture transfer characteristics and surface crack development of a single lignite particle (SLP) driven by humidity difference is helpful to achieve a better understanding of the fragmentation characteristics of lignite during the moisture transfer process. This is of great significance to the safe operation of a drying system. The characteristics of moisture transfer within SLP driven by humidity difference were studied in different stages. Six drying equations commonly used in the literature were selected to describe the moisture transfer behavior. The apparent diffusion coefficient (D eff) of moisture in each stage was calculated to compare the driving forces of moisture transfer in different stages. The surface crack rate (CR) was used to quantitatively analyze the fragmentation characteristics of SLP caused by moisture transfer. The results showed that the moisture transfer process of SLP driven by humidity difference can be divided into three stages, and stage I is the main moisture removal stage. The larger the particle size, the longer the stage I, while less moisture is removed in this stage. A logarithmic drying equation best simulates the moisture transfer process of SLP. The larger the particle size, the larger the D eff value in each stage. The driving force of moisture transfer in stage I is the largest, which is the opposite of a thermal drying process. CR for SLP has experienced a rapid increase – stable at the highest value – rapid decrease – stable during the moisture transfer process driven by the humidity difference.

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A review on moisture re-adsorption of lignite treated using different drying techniques

Cited by 14 publications

References 75 publications

Quantum chemical study on non-thermal plasma degradation tar in gasification syngas

Quantum chemical study on non-thermal plasma degradation tar in gasification syngas

Combustion performance of lignite after efficient upgrading via deep eutectic solvent‐assisted hydrothermal dewatering

Characteristics of Moisture Transfer and Surface Crack Development of a Single Lignite Particle Driven by Humidity Difference

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