Combustion kinetics and structural features of bituminous coal before and after modification process

Sun, Minmin; Ning, Xiaojun; Zhang, J.; Li, K.; Tang, Qingbo; Liu, Z.; Wang, G.; Wang, H.

doi:10.1007/s10973-017-6709-2

Cited by 12 publications

(5 citation statements)

References 29 publications

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“…4 Meanwhile, these experimental results are close to those reported in the literature. 7 . This is principally because the volatile content (32.4%, mass) of bituminous coal (Shenhua coal in the literature 4 ) is much higher than that of char in this study and the literature.…”

Section: Resultsmentioning

confidence: 99%

“…This is principally because the volatile content (32.4%, mass) of bituminous coal (Shenhua coal in the literature 4 ) is much higher than that of char in this study and the literature. 7 So a lot of bridge and branch bonds of molecular structure that exist in bituminous coal are released as volatile matter during pyrolysis, and the burning of the volatile matter determines the ignition point of coal and char. The more volatile the content, the lower the ignition temperature.…”

Section: Resultsmentioning

confidence: 99%

“…5 Through the change of the weight loss curve, thermal analysis not only can yield the kinetic parameters and the mechanism function of the reaction, but also can be used study the physical and chemical properties of fuel. 6 Sun 7 investigated the combustion characteristics of bituminous coal and its pyrolytic char at different heating rates, and the kinetic parameters at different heating rates were calculated by distributed activation energy model methods. The results show that, compared with bituminous coal, the ignitability and comprehensive combustion characteristics of its pyrolytic char slightly decreased.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Non-isothermal TGA study on the combustion reaction kinetics and mechanism of low-rank coal char

Wang

Cheng

et al. 2018

RSC Adv.

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In this paper, the combustion reaction kinetics of pyrolysis char of low-rank coal is studied by thermal analysis technology. For the combustion process of the char at different heating rates, the reaction kinetic parameters were calculated by three common mode-free methods (FWO method, KAS method , respectively, and the activation energy decreased with increasing conversion rates. There is a compensation effect between the activation energy and pre-exponential factor of char combustion. Results of the kinetic analysis by Malek method and Popescu method both indicated that the Avrami-Erofeev equation) controlled by nucleation and nuclei growth models is the most probable reaction model of char combustion.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Non-isothermal TGA study on the combustion reaction kinetics and mechanism of low-rank coal char

Wang

Cheng

et al. 2018

RSC Adv.

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show abstract

“…Raman spectroscopy is widely used in carbon structure analysis. By analyzing the D band near 1 350 cm − 1 and the G band near 1 580 cm − 1 , which represent the disordered structure or in-plane defects located between the basic structural units and the graphite E2 g2 mode respectively, 19) the structural parameters were obtained. And both the intensity ratio 20) and the area ratio 21) of these two bands are often used to characterize the degree of graphitization.…”

Section: Degree Of Graphitizationmentioning

confidence: 99%

Phase Composition and Properties Distribution of Residual Iron in a Dissected Blast Furnace Hearth

Zhang

Jiao

et al. 2020

ISIJ Int.

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Dissection research is the most meaningful way to understand the internal conditions of blast furnace. Because it can obtain samples from hearth after a blast furnace was shut down. In this paper, a 2 200 m 3 commercial blast furnace was shut down with residual iron remained inside. And then core drilling method was used to obtain a horizontal sample of residual iron, which was located 1 610 mm below the centerline of taphole and had a length of 1 840 mm. A variety of techniques, such as scanning electron microscopyenergy dispersive spectroscopy (SEM-EDS), Optical Microscope, X-ray diffraction (XRD) and Raman spectroscopy were applied to analysis the microscopic morphology, phase composition and properties distribution of residual iron samples at different position. The results show that complex phases appear near the cold side, including Fe, C, Ti 3 N 2 , KAlSi 2 O 6 and Al 2 O 3. And distribution of properties along the core sample from inside to cold side like density, degree of graphitization and thermal diffusion also have a big change. These results are considered to be related to the function of cooling system. KEY WORDS: dissection of blast furnace; Ti 3 N 2 ; KAlSi 2 O 6 ; density; degree of graphitization; thermal diffusion.

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“…The explorations on the characteristics of pyrolysis and low oxygen combustion residues and reburning oxidation characteristics are lacking. In addition, in many previous studies, it was found that macroscopic analysis of thermal analysis technology [26][27][28][29][30] has become the main research method of coal pyrolysis and combustion. Thermal analysis methods can repeatedly reflect the whole process of coal pyrolysis and combustion, accurately record experimental data, and quantitatively characterize experimental results.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Pyrolysis and Low Oxygen Combustion of Long Flame Coal and Reburning of Residues

et al. 2021

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To further understand the problems of coal combustion and coalfield fire reignition, this paper researched the reaction characteristics of coal pyrolysis and low oxygen combustion and the reburning oxidation characteristics of residual structure by thermal analysis methods. The results show that temperature promotes both pyrolysis and low oxygen combustion reactions, but low oxygen combustion reaction is more sensitive to temperature changes. As the constant temperature rises, the mass reduction rate of low oxygen combustion of coal samples reaches 80% on average, which is 4 times that of pyrolysis, and the variations of thermogravimetric parameters are also significantly higher than those of pyrolysis. However, the higher the pyrolysis degree of the residues, the stronger their oxidizability, which greatly enhances the intensity and concentration of the secondary combustion, and the mass of residues is reduced by 90% on average. Conversely, because the combustible components are continuously consumed during low oxygen combustion, the reburning characteristics of residues become less obvious. For instance, the weight loss rate slows down, the burning becomes dispersed, and the burning intensity is weakened. In addition, the heat release is reduced from 8662 to 444.5 J/g, and the change trend is just opposite to that of pyrolysis. The above results show that as the constant temperature rises, the pyrolysis reaction greatly shortens the reburning process, while the low oxygen combustion reaction largely inhibits the reburning.

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Combustion kinetics and structural features of bituminous coal before and after modification process

Cited by 12 publications

References 29 publications

Non-isothermal TGA study on the combustion reaction kinetics and mechanism of low-rank coal char

Non-isothermal TGA study on the combustion reaction kinetics and mechanism of low-rank coal char

Phase Composition and Properties Distribution of Residual Iron in a Dissected Blast Furnace Hearth

Characteristics of Pyrolysis and Low Oxygen Combustion of Long Flame Coal and Reburning of Residues

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