An approach for upgrading lignite to improve slurryability: Blending with direct coal liquefaction residue under microwave-assisted pyrolysis

Gu, Suqian; Xu, Zhiqiang; Ren, Yangguang; Tu, Yanan; Sun, Meijie; Li, Xiangyang

doi:10.1016/j.energy.2021.120012

Cited by 26 publications

(4 citation statements)

References 59 publications

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“…The fraction of Mogoin gol coal with size 3-1.5 mm was enriched by using of zinc chloride (ZnCl 2 ) as a heavy liquid with a density of 1.3-1.7 g/cm 3 . The yields of fractions and ash content of faction were determined, and the enrichment curve is constructed and shown as a result of enrichment in Tab.…”

Section: Resultsmentioning

confidence: 99%

“…The instrument was used to study the heat resistance of analytical coal samples and was tested in an argon gas environment at 25-1150 °C for 120 minutes at a heating rate of 10 °C/min. 3 . After that, washing and removing the submerged and floating fractions from the solution residue, determined their yield and ash content.…”

Section: Methodsmentioning

confidence: 99%

“…It is important that, to study the mechanism of thermal decomposition of coal, necessary to reduce the amount of minerals in coal [1]. Coal and coal products will play an increasingly important role in fulfilling the energy needs of our society [2][3]. Based on IEA 2008 report, coal accounts for about 26% of the total world primary energy consumption in 2006 [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Study on thermal decomposition and enrichment quality of coal from Mogoin gol deposit in Mongolia

Batkhishig

Shagjjav

Batbileg

et al. 2022

Izvestiâ vuzov. Prikladnaâ himiâ i biotehnologiâ

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The main purpose of this study is to investigate the thermal stability and the mechanism of thermal decomposition of Mogoin gol coal, the possibility of liquefaction by pyrolysis and thermolysis, and the possibility of enriching by heavy liquids to reduce the mineral content of coal and improve its quality. Under this purpose, the Mogoin gol coal was characterized by proximate and ultimate analysis, thermogravimetry, and investigated its thermal decomposition (thermolysis and pyrolysis). Thermogravimetric analysis was performed using Japanese HITACHI TG/DTA7300 instrument and pyrolysis investigation was carried out at different heating temperatures 200–700 °C with constant heating rate 20 °C/min for 80 min. On the basis of proximate and elemental analysis results, it has been indicated that the Mogoin gol coal is high-rank coking coal. The pyrolysis of Mogoin gol coal was studied by SNOL furnace at different heating temperatures and obtained from pyrolysis products such as hard residue, tar, pyrolytic water, and gas. From pyrolysis, the yield of pyrolysis tar (6.28 %) was highest at 700 °C. The experiment of thermal decomposition (thermolysis) was carried out in air closed autoclave at 350–450 °C and using hydrogen donor solvent (tetraline) with different mass ratios of coal and solvent (1:1.75; 1:1.5). In the thermolysis experiment, the yield of liquid product is highest with the coal-solvent ratio of 1: 1.5 at 450 °C.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study on thermal decomposition and enrichment quality of coal from Mogoin gol deposit in Mongolia

Batkhishig

Shagjjav

Batbileg

et al. 2022

Izvestiâ vuzov. Prikladnaâ himiâ i biotehnologiâ

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“…The coal gasification fine slag, named as XFS, was procured from a typical entrained-flow coal gasification plant in Xinjiang, China. Because the moisture content of the initial XFS was 56.91%, the experimental samples were dried at 105 °C for 6 h and subsequently air dried for 12 h. The proximate analysis , and high heating value of XFS was presented in Table . The fixed carbon content of XFS was as high as 31.78%, indicating its potential recovery value for the coal gasification plants.…”

Section: Methodsmentioning

confidence: 99%

Enrichment of Residual Carbon in Coal Gasification Fine Slag via Wet Sieving Separation with Ultrasonic Pretreatment

Sun

Liu

et al. 2022

ACS Omega

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To overcome the environmental and economic challenges posed by the increasing amounts of the coal gasification slag, here, a simple and efficient method for enriching the residual carbon from the coal gasification fine slag was proposed. The residual carbon enrichment pattern in the particle size distribution of coal gasification fine slags after the ultrasonic pretreatment was mainly enriched toward the 500–250 μm and 250–125 μm particle size classes by analyzing the changes in the particle size distribution and apparent morphology. The pulp pretreatment at the ultrasonic output power of 270 W for 4 min was determined as the optimal experimental condition with respect to the yield, ash content, and ash rejection of the concentrates. Compared to the conventional wet sieving separation, the yield and ash content of the final concentrates were reduced by 7.99 and 14.96%, respectively. Moreover, the ash rejection of the final concentrates was as high as 88.51%, indicating an increment of 11.63% than the conventional wet sieving separation. Furthermore, thermogravimetric analysis confirmed that the final concentrates exhibited the lowest reactivity; however, these demonstrated had the highest carbon content (nearly 70%) with 27.27% ash content. The combustion characteristics analysis showed that the wet screening concentrate after ultrasonic pretreatment had the highest composite combustion characteristic index (S) of 3.17 × 10–8, as compared to the raw and conventional sieving concentrates.

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Gas composition during thermochemical conversion of dry solid fuels and waste-derived slurries

Nyashina

Dorokhov

Romanov

et al. 2022

Environ Sci Pollut Res

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An approach for upgrading lignite to improve slurryability: Blending with direct coal liquefaction residue under microwave-assisted pyrolysis

Cited by 26 publications

References 59 publications

Study on thermal decomposition and enrichment quality of coal from Mogoin gol deposit in Mongolia

Study on thermal decomposition and enrichment quality of coal from Mogoin gol deposit in Mongolia

Enrichment of Residual Carbon in Coal Gasification Fine Slag via Wet Sieving Separation with Ultrasonic Pretreatment

Gas composition during thermochemical conversion of dry solid fuels and waste-derived slurries

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