Thermodynamic characteristics of coal reaction under low oxygen concentration conditions

Qi, Xuyao; Li, Qizhong; Zhang, Huijun; Xin, Haihui

doi:10.1016/j.joei.2016.05.007

Cited by 109 publications

(23 citation statements)

References 23 publications

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“…FC)/A for the 16 coal samples. Coal A2, N2 and N4 possess very low H f values of 1.19, 1.16 and 1.14 that is a clear indication of better combustion performance (Qi et al 2017). The results obtained are in line with literature (Aich et al 2019a;Liu et al 2015), according to which a fuel having the maximum S f value and the minimum H f value shows better combustion performance since both the indices S f and H f are directly and inversely related to maximum combustion rate (DTG max ), respectively (Eq.…”

Section: Analysis Of Comprehensive Indicesmentioning

confidence: 99%

Relationship between proximate analysis parameters and combustion behaviour of high ash Indian coal

Aich

Nandi

Bhattacharya

2020

Int J Coal Sci Technol

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This work presents the analysis of combustion characteristics of high ash Indian coal (28%-40%) collected from different mines of Singaurali coalfield, India. All the coal samples were characterized by proximate and gross calorific value analysis. Combustion performance of the coals were characterised using thermo-gravimetric analysis to identify the burning profile of individual coals. Various combustion kinetic parameters such as ignition temperature, peak temperature and burnout temperature, ignition index and burnout index, combustion performance index plus rate and intensity index of combustion process, activation energy were determined to analyse the combustion behaviour of coal. Further all these combustion properties were compared with the volatile matter, ash, fixed carbon and fuel ratio of each coal. Theoretical analysis shows that with increase in ash content, combustion performance initially increases and later descends. Further, coal with (25 ± 1.75)% volatile matter, 20%-35% ash and fuel ratio 1.4-1.5 were found to be optimum for coal combustion.

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Section: Analysis Of Comprehensive Indicesmentioning

confidence: 99%

Relationship between proximate analysis parameters and combustion behaviour of high ash Indian coal

Aich

Nandi

Bhattacharya

2020

Int J Coal Sci Technol

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“…On the basis of previous studies, 34,35 the critical temperature T 1 is the rst maximum peak point of the weight loss rate during the coal reaction process. At this temperature, the reaction rate between oxygen and the active groups existing in coal will accelerate obviously, which results in increases of the oxygen consumption rate, water evaporation and released gas production amount.…”

Section: Tg/dtg Resultsmentioning

confidence: 99%

Thermogravimetric and infrared spectroscopic studies of the spontaneous combustion characteristics of different pre-oxidized lignites

Chen

Zhai

et al. 2019

RSC Adv.

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“…QI et al showed that the coal combustion reaction was milder in a system with a low oxygen concentration and resulted in a long reaction time. Therefore, the burnout temperature increased accordingly (49). Similarly, as the contact area of the CG-lamina with oxygen was small, its burnout temperature was higher.…”

Section: Sta Detectionmentioning

confidence: 95%

Effect and Mechanism of High-Pressure Processing: A Case Study of Flue-Cured Tobacco

Tan

Yang

et al. 2017

Beiträge Zur Tabakforschung International/Contributions to Tobacco Research

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Summary After a high-pressure processing (HPP) treatment sensory evaluation of flue-cured tobacco showed modifications. There was no significant difference (P > 0.05) between the routine chemical components (total sugar, reducing sugar, nicotine, and total nitrogen) of flue-cured tobacco after high-pressure processing treatment (HPP sample) and that of an untreated control group (CG). An overall judgement, which can be made from the observations of scanning electron microscopy (SEM), X-ray computed microtomography (micro-CT) and transmission electron microscopy (TEM), is that HPP could compress the inner tunnel and tissue gap in a flue-cured tobacco leaf. However, the ultrastructure, such as the cellular cytoskeleton, would not be changed. Compared with CG, the apparent density of the HPP sample rose by 19.3%, while the true density only rose by 1.4%. This also explained that the main effect of high-pressure processing on flue-cured tobacco was microstructure compression rather than compression on the ultrastructure level. The differences between the lamina (leaf-shaped) sample, which were caused by high-pressure processing, were reflected in terahertz time-domain spectroscopy (THz-TDS), simultaneous thermal analysis (STA), and pyrolysis gas chromatography/mass spectrometry (Py-GC/MS). When the same tests were carried out using a sample that was milled to a powder, however, these differences were nearly removed. The milling process destroyed most of the microstructure of the flue-cured tobacco lamina; therefore, the results of THz-TDS, STA, and Py-GC/MS confirmed the hypothesis: That 400 MPa high-pressure processing treatment minimally changes the ultrastructure of flue-cured tobacco and only changes its relatively larger microstructure.

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Thermodynamic characteristics of coal reaction under low oxygen concentration conditions

Cited by 109 publications

References 23 publications

Relationship between proximate analysis parameters and combustion behaviour of high ash Indian coal

Relationship between proximate analysis parameters and combustion behaviour of high ash Indian coal

Thermogravimetric and infrared spectroscopic studies of the spontaneous combustion characteristics of different pre-oxidized lignites

Effect and Mechanism of High-Pressure Processing: A Case Study of Flue-Cured Tobacco

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