Thermogravimetric Assessment of Combustion Characteristics of Blends of Lignite Coals with Coal Gangue

Song, Changzhong; Wen, Jiang-Hui; Li, Yuyin; Hong, Dunpin; Shi, Xin-Ying; Shen, Xipeng

doi:10.2991/mme-16.2017.67

Cited by 14 publications

(7 citation statements)

References 8 publications

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“…Based on these results, it can be concluded that the oxy‐cracked petcoke is more ignitable, reactive, flammable, combustible, easier to oxidize, and has less pollutant than the virgin petcoke. It was reported that the materials with the highest values of

D_{i}, D_{f}, S_{s}

, and FI may be advantageously used for blending with other fuel . Therefore, mixing such ignitable and effective material with a currently‐used fuel would be a promising approach for saving consumed energy and reducing the emitted gases.…”

Section: Resultssupporting

confidence: 73%

“…Another important feature of the fuel is the flammability index (FI). The FI reflects the fuel combustibility; the higher FI is, the better the fuel's combustibility is, and can be determined by the following equation:

FI = \frac{{normalR}_{normalmax}}{{normalT}_{normali}^{2}}

…”

Section: Experimental Workmentioning

confidence: 99%

“…It was reported that the materials with the highest values of D D S , , i f s , and FI may be advantageously used for blending with other fuel. [30,50] Therefore, mixing such ignitable and effective material with a currently-used fuel would be a promising approach for saving consumed energy and reducing the emitted gases. In this occasion, two mixtures of 0.25 and 0.50 g/g oxy-cracked per virgin petcoke were oxidized in the TGA under similar conditions to the ones previously mentioned and compared with virgin and oxy-cracked petcoke.…”

Section: Heating Values Of Virgin and Oxy-cracked Petcokementioning

confidence: 99%

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Enhancement of petroleum coke thermal reactivity using Oxy‐cracking technique

2019

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Petroleum coke (petcoke) is a challenging fuel in terms of its complexity, high sulphur and nitrogen content, low volatile content, and undesirable emissions of SOx and NOx when used for power generation. To overcome these challenges, the oxy‐cracking process was recently proposed to convert the petcoke into a clean combustion fuel by reducing its sulphur and nitrogen contents, and consequently increasing its reactivity and combustibility. This work aimed to study the heating values and thermo‐oxidative behaviour of the oxy‐cracked petcoke, virgin petcoke, and their blends using thermogravimetric analysis (TGA). The results showed that the oxy‐cracked petcoke is oxidized at a temperature of 475 °C, which is easier and faster than the virgin petcoke, which is usually oxidized at around 540 °C. The heating value of the oxy‐cracked petcoke was not impacted and maintained constant ~30 MJ/kg, which is relatively similar to the virgin petcoke. The nitrogen and sulphur content in the oxy‐cracked petcoke is much lower than that of virgin petcoke. A significant improvement in the combustion performance parameters of the oxy‐cracked petcoke and their blends with virgin petcoke was achieved. For instance, the ignition temperature of the proposed fuel is reduced to 13 % compared to the virgin petcoke, which led to increasing the ignition index by two‐folds. Therefore, this approach might help in improving the thermal efficiency of petcoke by using oxy‐cracked products as an initiator in the combustion process.

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D_{i}, D_{f}, S_{s}

Section: Resultssupporting

confidence: 73%

FI = \frac{{normalR}_{normalmax}}{{normalT}_{normali}^{2}}

…”

Section: Experimental Workmentioning

confidence: 99%

Section: Heating Values Of Virgin and Oxy-cracked Petcokementioning

confidence: 99%

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Enhancement of petroleum coke thermal reactivity using Oxy‐cracking technique

2019

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“…[48]. Therefore, impacts on coal structural intactness, density and fracture toughness are comprehended from the plot-skewness and pattern irregularity echoed via peak-de ection intensity data or the diffraction patterns suggested large quantity of the amorphous phases being detected hence plot broadness and sloping which are not easily mapped highlighted numerous phase irregularity and orientation-variance with a short time interval [38], [49].…”

Section: Xrdmentioning

confidence: 99%

Coal Structure Evaluation and Morphological Properties That Affect the Coal Usage in Industries.

Gaesenngwe,

Danha,

RAGHUPATRUNI

et al. 2024

Preprint

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The contemporary research article is central to understanding coal structure evaluation and the morphological development impacting its utilization in different applications. Through Mineral Liberation Analysis (MLA) designs high content phyllosilicates minerals and swelling clay minerals were rationalized to provides a novel insight into enhanced coal beneficiation and the benefits of coal by-product re-utilization progressions that encourage safer environments and economic sustainability. This work commences with collection of five (5) different coal samples from the central district mine in Botswana and chemical characterization via Thermogravimetric coal analysis, x-ray fluorescence spectroscopy, x-ray diffraction, scanning electron microscopy and the Hardgrove Grindability Index testing that quantify coal material hardness and fracture toughness. The results showed sulfur and phosphorus inclusions in all samples complemented through sphalerite mineral phases (Zn, Fe)S and the coal morphology stimulated the material fracture toughness and hardness properties by influential mineral amalgams intrinsic to the Botswana central district coal maceral such as aluminum oxides (Al2O3), silicate (SiO2), calcites (CaO), Iron oxide (Fe2O3), potassium feldspars (K−AlSi3O8), albite (Na−AlSi3O8), and anorthite (Ca−Al2Si2O8) compounds in alkali feldspars which are predominantly group I and II carriers were perceived in substantial quantities. The coal industry has attracted much industrial attention by supply of high energy potent coal material and coal-by products to manufacturing foundations producing cement, ceramic tiles, paving bricks and material synthesis and will continue to supply other economic sectors in the conceivable future. Nevertheless, environmental concerns consequential to coal beneficiation are pressing issues requiring transdisciplinary innovations through investigations and technological practices that encourage the elimination of toxins and hazardous compounds from coal products therefore holistically generating sustainable and renewable resource for the future.

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“…In order to have a better overview of the different combustion characteristics, three integrated indexes were computed [39,40].The ignition index (D i ) is calculated using Equation (2):…”

Section: Yield (%) =mentioning

confidence: 99%

Bioenergy Conversion Potential of Decaying Hardwoods

Dupuis

Thiffault

Barrette³

et al. 2020

Energies

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Unharvested hardwoods are abundant in eastern Canada, due to the low quality of their fiber and the absence of outlets in conventional wood transformation industries. The objective of this study was to assess the biochemical and thermochemical energy conversion potential of decaying hardwoods and compare their relationships with external and internal indicators of tree degradation. We characterized how wood-decay processes altered the physical and chemical properties of these woods and affected their digestibility yield and their performance according to indexes of stability and efficiency of combustion. DNA analysis on wood samples was also performed to determine the relative abundance of white-rot fungi compared to that of other saprotrophs. All properties stayed within the range of variations allowing the wood to remain suitable for conversion into bioenergy, even with increased decay. We found no significant differences in the physical and chemical properties that are crucial for energy production between wood from externally-assessed live and decayed trees. However, the proportion of wood area affected by rot was significantly associated with increased digestibility yield, and with decreased combustion reactivity. We could not detect any specific effect associated with increased relative abundance of white-rot fungi. These results suggest that the utilization of biomass from decayed hardwoods instead of live trees for bioenergy production should not alter the conversion efficiency and even potentially increase the performance of biochemical pathways, and hence, support their use as feedstock for bioenergy production.

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Thermogravimetric Assessment of Combustion Characteristics of Blends of Lignite Coals with Coal Gangue

Cited by 14 publications

References 8 publications

Enhancement of petroleum coke thermal reactivity using Oxy‐cracking technique

Enhancement of petroleum coke thermal reactivity using Oxy‐cracking technique

Coal Structure Evaluation and Morphological Properties That Affect the Coal Usage in Industries.

Bioenergy Conversion Potential of Decaying Hardwoods

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