Pyrolysis of superfine pulverized coal. Part 2. Mechanisms of carbon monoxide formation

Liu, Jiaxun; Jiang, Xiumin; Shen, Jun; Zhang, Hai

doi:10.1016/j.enconman.2014.07.055

Cited by 76 publications

(39 citation statements)

References 40 publications

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“…The data from the study of Zhang and Fletcher [13] supported this idea that oxygen radicals could promote the NH 3 formation [14]. Moreover, there were other results that suggested the hydrogenation of HCN in the gas phase was the source of NH 3 . The contribution of thermal cracking of homogeneous tar-N might not be ignored [15].…”

Section: Introductionmentioning

confidence: 85%

“…The chemical compositions determined by standard ultimate and proximate analysis were extensively discussed in the previous literature [2,3]. The representative coals with different equivalent mean particle sizes were prepared using a QLM-80K fluidized bed jet mill.…”

Section: Methodsmentioning

confidence: 99%

“…The functional forms of char-nitrogen were also determined via X-ray photoelectron spectroscopy (XPS). As our previous research showed that coal particle size had significant influence on the physical textures [25], chemical morphology [26], pyrolysis behaviors [2,3,27], combustion performance [28], and NO x emissions [29,30]. However, the effects of particle size on the distribution of pyrolysates hardly reach an agreement [31].…”

Section: Introductionmentioning

confidence: 92%

“…The detailed CH 4 and CO formation mechanisms during coal pyrolysis have been discussed in Part 1 and Part 2 of this series [2,3]. Furthermore, coal devolatilization has a significant influence on the pollutant formation process.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Schäfer [10] assumed that NH 3 was formed from the hydrolysis of HCN above 600°C. Bassilakis et al [11] attributed the yields of NH 3 to the secondary reaction between HCN and coal hydrogen in the pore structures. In addition, Hämäläinen and co-workers [12] elucidated the importance of oxygen-containing groups on the conversion to NH 3 at the expense of HCN.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Pyrolysis of superfine pulverized coal. Part 3. Mechanisms of nitrogen-containing species formation

Liu

Jiang

Shen

et al. 2015

Energy Conversion and Management

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Section: Introductionmentioning

confidence: 85%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Pyrolysis of superfine pulverized coal. Part 3. Mechanisms of nitrogen-containing species formation

Liu

Jiang

Shen

et al. 2015

Energy Conversion and Management

Self Cite

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Effect of carbonization temperature on the grindability of carbonaceous material produced from different coals

et al. 2019

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Carbonization experiments were conducted on four kinds of sub-bituminous coal particles at a temperature range of 450-1200°C. The effect of treating temperature on the grindability of produced carbonaceous materials was investigated, and its mechanism was analyzed through various means. Results show that the grindability of all coals, whether caking or slightly-caking, exhibit the same variation trend with an increase in carbonization temperature. Moreover, the entire process can be divided into four stages. (1) After the most intense devolatilization stage, the grindability of carbonaceous material exhibited different degrees of increase compared with that of raw coal because of the development of a pore structure. (2) The first significant decrease in the grindability occurred from the plastic stage to the complete resolidification of the coal matrix.(3) After the aromatic polycondensation stage accompanied by a large amount of H 2 release, the coal molecular structure became compact, such that the grindability of semi-coke considerably decreased again. (4) At high temperatures, the coal matrix underwent graphitization, which changed semi-coke to coke. The molecular structure of coal became ordered, and the grindability decreased again. The analysis shows that a change in the internal chemical structure of carbonaceous material has a much more pronounced effect on grindability than a change in its pore structure, except in the first stage. The constant compaction and regularization of the coal molecular structure continued happening throughout the entire process and play a decisive role in the change in grindability.

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Pyrolysis characteristics of low‐rank coals based on double‐gaussian distributed activation energy model

et al. 2019

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Pyrolysis is an important technology in the utilization of low-rank coals (LRCs) and is a prerequisite stage for other conversion methods. This study aimed to develop an understanding of the pyrolysis process of LRCs, especially the relationship between the pyrolysis kinetics and the internal chemical structure. The chemical structure parameters of all of the samples were obtained using the Fourier transform infrared spectroscopy (FTIR) method. Thermogravimetric (TG) experiments were conducted at different heating rates (5, 10, and 20 K/min), and the experimental results were fitted using the distributed activation energy model (DAEM). DAEM based on double-Gaussian distribution (2G-DAEM) exhibited an acceptable fit to the experimental data in this study. An analysis of the chemical structure parameters of the four types of coals and the kinetic model obtained by fitting indicated that the difference in the chemical structure parameters among the coal samples could effectively explain the difference in the pyrolysis process and the activation energy distribution. The primary pyrolysis stage of the coal samples, including the thermal hysteresis effect caused by the increase in the heating rate, was accurately described by the 2G-DAEM in this study.

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Pyrolysis of superfine pulverized coal. Part 2. Mechanisms of carbon monoxide formation

Cited by 76 publications

References 40 publications

Pyrolysis of superfine pulverized coal. Part 3. Mechanisms of nitrogen-containing species formation

Pyrolysis of superfine pulverized coal. Part 3. Mechanisms of nitrogen-containing species formation

Effect of carbonization temperature on the grindability of carbonaceous material produced from different coals

Pyrolysis characteristics of low‐rank coals based on double‐gaussian distributed activation energy model

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