Polycyclic aromatic hydrocarbon (PAH) content of Malkara lignite and its ex-situ underground coal gasification (UCG) char residues

Ütnü, Yunus Emre; Okutan, Hasancan; Aydın, Ahmet Alper

doi:10.1016/j.fuel.2020.117949

Cited by 14 publications

(2 citation statements)

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“…Ütnü et al analyzed Malkara lignite (Turkey) and the ash generated from underground gasification and studied the composition of polycyclic aromatic hydrocarbons and their derivatives and the distribution of organic matter in the samples. 16 Ma et al. prepared the continuous conversion product of UCG through a pyrolysis device and combined chemical analysis and thermodynamic calculation to study the chemical forms of the harmful elements in the UCG product.…”

Section: Introductionmentioning

confidence: 99%

Research on the Pollutant Migration Law Based on Large-Scale Three-Dimensional Similar Simulation Experiments of Underground Coal Gasification

et al. 2022

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The potential pollution risk of underground coal gasification (UCG) has become a key factor restricting the development of UCG industrialization. Therefore, studying the migration and diffusion behavior of harmful pollutants is of great significance for preventing UCG pollution. In this paper, a large-scale three-dimensional similar simulation experimental device for UCG is used to simulate the gasification of Tianjin fat coal under actual working conditions. The rock layer around the simulated coal seam was sampled after the gasification was completed, the contaminants in the samples were examined by XRD, and the changes in the relative content of the contaminants at different sampling points were studied by FTIR. The results showed that benzene, phenols, aldehydes, aromatic hydrocarbons, and aromatic heterocyclic compounds remained after the gasification of No. 7 sampling point in Qianjiang, Tianjin, and that the main pollutants were aromatic hydrocarbons. The migration and enrichment of phenol and aldehyde pollutants were about the same on the east and west sides of the gasification center, while benzene pollutants were more easily migrated and enriched than aromatic heterocyclic compounds. The migration distance of phenolic pollutants on the south side of the gasification area is smaller than that of other pollutants and their maximum vertical distance from the gasification reaction area to the south is about 0.7 m. The results can provide a scientific basis for pollutant risk identification and prevention and control in the later UCG field test.

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Section: Introductionmentioning

confidence: 99%

Research on the Pollutant Migration Law Based on Large-Scale Three-Dimensional Similar Simulation Experiments of Underground Coal Gasification

et al. 2022

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“…Therefore, it is of great scientific and practical significance to study the correlation between the gasification process and the mineral characteristics through laboratory scale simulation test for understanding the actual reaction conditions. In addition, it has long been feared that the UCG residuals will cause potential pollution in the adjacent groundwater of gasified coal seams, and the dissolution of harmful trace elements in the ash is closely related to the mineral characteristics of the ash 16 . Therefore, it is of great scientific significance to study the mineral composition and transformation of ash and slag under different gasification conditions to understand the real reaction conditions, improve the efficiency of coal utilization, and identify and control the environmental impact of ash and slag 17–19 …”

Section: Introductionmentioning

confidence: 99%

Sequential transformation study of minerals during underground coal gasification: Promising to indirectly reflect the actual reaction condition

Wang

et al. 2021

Asia-Pacific J Chem Eng

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The mineralogical characteristics of underground coal gasification (UCG) residuals are closely related to the gasification conditions. The study of the mineral composition and transformation of ash and slag under different gasification conditions has important scientific significance for understanding the real gasification conditions, improving the utilization efficiency of coal, and identifying and controlling the environmental impact. In this paper, the sequential transformation of minerals under different temperature and atmosphere are studied by X‐ray diffraction (XRD) and FactSage software, and the elemental composition of the surface of the UCG ash and slag is characterized by SEM‐EDX. The results show that the main minerals in the semicoke are quartz (SiO2), illite (K1.5Al4(Si6.5Al1.5)O20(OH)4), and sanidine (KAlSi3O8). In the 900–1300°C reduction, ash, quartz, sanidine, hercynite (FeAl2O4), anorthite (CaAl2Si2O8), and mullite (Al6Si2O13) are the main minerals. The minerals in the oxidation residuals (1100–1500°C) are quartz, anorthite, hematite (Fe2O3), hercynite, cordierite (Fe2Al4Si5O18), and cristobalite. The reaction temperature has a significant effect on the changes in mineralogy. The reaction temperature is low during the pyrolysis process, and most changes involve only structural changes. With the reaction temperature increases, a series of reactions occur between different minerals. The reaction atmosphere also has a significant effect on the mineralogy. The research on the transformation of minerals in UCG residues can indirectly reflect the actual process of UCG, which can provide suggestions for the stable operation of the UCG process.

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Carbon dots as specific fluorescent sensors for Hg2+ and glutathione imaging

Zhang

et al. 2023

Microchim Acta

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Polycyclic aromatic hydrocarbon (PAH) content of Malkara lignite and its ex-situ underground coal gasification (UCG) char residues

Cited by 14 publications

References 40 publications

Research on the Pollutant Migration Law Based on Large-Scale Three-Dimensional Similar Simulation Experiments of Underground Coal Gasification

Research on the Pollutant Migration Law Based on Large-Scale Three-Dimensional Similar Simulation Experiments of Underground Coal Gasification

Sequential transformation study of minerals during underground coal gasification: Promising to indirectly reflect the actual reaction condition

Carbon dots as specific fluorescent sensors for Hg2+ and glutathione imaging

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