Influence of coal properties on coal conversion processes-coal carbonization, carbon fiber production, gasification and liquefaction technologies: a review

Keboletse, Kamogelo P.; Ntuli, Freeman; Oladijo, Oluseyi Philip

doi:10.1007/s40789-020-00401-5

Cited by 37 publications

(17 citation statements)

References 143 publications

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“…The carbonized coal was then pulverized and crushed in a laboratory mortar and pestle to turn the large lumps of coal into tiny granules. The studies by 26 , 27 support this technique. To achieve carbonized coal particles (CCP) of 90 μm size, the produced carbonized coal underwent further sieving as.…”

Section: Methodsmentioning

confidence: 70%

Taguchi optimization and modelling of stir casting process parameters on the percentage elongation of aluminium, pumice and carbonated coal composite

Ibrahim

Yawas

Dan-asabe

et al. 2023

Sci Rep

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Aluminium matrix composites, which are a subclass of metal matrix composites, have characteristics including low density, high stiffness and strength, better wear resistance, controlled thermal expansion, greater fatigue resistance, and improved stability at high temperatures. The scientific and industrial communities are interested in these composites because they may be used to manufacture a broad variety of components for cutting-edge applications. This has study observed how the stirring speed, processing temperature, and stirring duration of the stir casting process affected the percentage elongation of Al-Pumice (PP)-Carbonized Coal Particles (CCP) hybrid composites. It also looked at the optimal weight of these natural ceramic reinforcements using the Taguchi optimization technique. While optimizing the percentage elongation property, the hard compound such as silica, iron oxide, and alumina, were discovered during the characterisation of the reinforcement, showing that PP and CCP can be used as reinforcement in metal matrix composite. The percentage of elongation of the hybrid composite was shown to be most affected by the PP, followed by processing temperature, stirring speed, CCP, and stirring time, using stir casting process parameter optimization. It was observed at 2.5 wt% of pumice particles, 2.5 wt% of carbonated coal particles, 700 °C processing temperature, 200 rpm stirring speed, and 5 min stirring time, the optimum percentage of elongation was discovered to be 5.6%, which is 25.43% lower than the percentage elongation of Al-alloy without reinforcing. The regression study developed a predictive mathematical model for the percentage elongation (PE) as a function of the stir casting process parameters and offered a high degree of prediction, with R-Square, R-Square (adj), and R-Square (pred) values of 91.60%, 87.41%, and 79.32% respectively.

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Section: Methodsmentioning

confidence: 70%

Taguchi optimization and modelling of stir casting process parameters on the percentage elongation of aluminium, pumice and carbonated coal composite

Ibrahim

Yawas

Dan-asabe

et al. 2023

Sci Rep

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“…The carbon in coal forms aromatic and aliphatic hydrocarbon compounds from coal. In this study, the carbon element produced in coal is almost as large as the value of fixed carbon in coal (Keboletse et al, 2021). The hydrogen and oxygen content decreases as the mass of the gasified coal increase.…”

Section: Characteristics Of Char Gasification Of Lowrank Coal By Prox...mentioning

confidence: 60%

Characteristics of Char from Low-Rank Coal Gasification

Asof¹,

Arita²,

Andalia³

2023

J. Ecol. Eng.

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The coal gasification process in this study aimedto increase the quality of low-rank coal (LRC) from lignite type to coal with semi-anthracite and anthracite grades with higher fixed carbon values. The gasification process wascarried out at temperatures between 700-900 °C. In the initial stages of the study, the relationship between the increase in gasification temperature with the mass of coal and the gasification process time was investigated. The proximate and ultimate analysis wascarried out to determine the characteristics of the raw materials used and the coal char produced from combustion. The analysis results are used to calculate the fuel ratio, where the fuel ratio is a parameter to determine the grade of coal. In addition, an SEM-spot EDS analysis was carried out on the gasified coal solids to ensure the fixed carbon content produced from the above process. The results showed that the gasification process could raise the grade of LRC into char products with semi-anthracite to anthracite, where the fuel ratio reached 10.84. From the product analysis results, the LRC coal gasification results using SEM-EDS showed that carbon reached 98.58%. The remaining inorganic elements in the product are less than 1.5%, such as Al, Si and K.

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“…, hydrogen, solar, and wind) and making greater use of fossil resources ( e.g. , coal and petroleum) as feedstock for chemical production has become an important trend for the sustainable development. , Coal is the most abundant fossil resource, and it is an important raw material for fuels and chemicals. − One of the most important routes from coal to chemicals is coal coking, whose product, coke, is usually used as a reducing agent for iron oxides in the iron and steel industry. , Meanwhile, there are a great amount of by-product, coal tar, producing in the process of coke production . In China alone, the annual output of coal tar is about 25 million tons .…”

Section: Introductionmentioning

confidence: 99%

Waste to Treasure: Preparation of Functional Polymeric Particles from Waste Olefins in Carbolic Oil by Self-Stabilized Precipitation Polymerization

Chang

Huang

Yang

2023

ACS Appl. Polym. Mater.

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Carbolic oil is a fraction of coal tar with an enormous reserve, 40% of which are aromatic olefins such as indene, coumarone, styrene, etc. However, it is an underutilized r esource due to the lack of deep processing technology. In this study, we copolymerized olefins in the carbolic oil with maleic anhydride (MAh) by self-stabilized precipitation polymerization (2SP) method, to obtain uniform carbolic oil–maleic anhydride copolymer (CMA) particles with high yield (≥90%). Uniform CMA particles with a number-average molecular weight (M n) in the range of 4400–24,100 g·mol–1 and particle sizes in the range of 150–2800 nm could be conveniently obtained by tuning the reaction factors. CMA exhibited good solubility in common organic solvents and possessed good thermal stability. After chemical modification of anhydride groups, CMA could be further converted into water-soluble carbolic oil–maleamic acid copolymers (CMAA), and heat-resistant and hydrophobic carbolic oil–maleimide copolymers (CMI). Overall, this research had provided a facile and green strategy for the effective utilization of waste olefins in carbolic oil, and the obtained copolymers had broad application prospects.

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Influence of coal properties on coal conversion processes-coal carbonization, carbon fiber production, gasification and liquefaction technologies: a review

Cited by 37 publications

References 143 publications

Taguchi optimization and modelling of stir casting process parameters on the percentage elongation of aluminium, pumice and carbonated coal composite

Taguchi optimization and modelling of stir casting process parameters on the percentage elongation of aluminium, pumice and carbonated coal composite

Characteristics of Char from Low-Rank Coal Gasification

Waste to Treasure: Preparation of Functional Polymeric Particles from Waste Olefins in Carbolic Oil by Self-Stabilized Precipitation Polymerization

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