Effect of H2O on pyrite transformation behavior during oxy-fuel combustion

Huang, Fang; Zhang, Liqi; Yi, Baojun; Xia, Zuojun; Chen, Zheng

doi:10.1016/j.fuproc.2014.12.027

Cited by 31 publications

(11 citation statements)

References 43 publications

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“…On the other hand, the combustion particles are more easily fragmented as more oxygen diffuses to the particle surface making it greatly difficult for iron-bearing minerals to be in contact with clay or other silicates included in the particles to form Fe-glass. 2,12,25 Our previously-reported study 34 supported the results presented herein, highlighting that the reaction rate of pyrite in the steam-containing atmosphere to be higher than that in the CO 2 -containing atmosphere. In the DTF experiment, the addition of water vapor increases the transformation of octahedral magnetite to tetrahedral magnetite, thus, facilitating the formation of hematite from magnetite.…”

Section: Fe-containing Phases Of Ashes Produced From Dtf Experimentssupporting

confidence: 89%

“… 33 On the one hand, water vapor replaces part of the dilute CO 2 gas, and O 2 diffusion is faster in H 2 O. 34 Thus, molecular O 2 is more likely to reach the surface of combustion particles and be in close contact with iron minerals in coal to form more iron oxides during the short residence time in the DTF chamber. On the other hand, the combustion particles are more easily fragmented as more oxygen diffuses to the particle surface making it greatly difficult for iron-bearing minerals to be in contact with clay or other silicates included in the particles to form Fe-glass.…”

Section: Resultsmentioning

confidence: 99%

“…Generally, it is known that O 2 diffuses faster in H 2 O than in CO 2 gas. 34 Therefore, during the short residence time in the DTF chamber, O 2 is more likely to reach the surface of combustion particles and be in contact with iron-containing minerals. The data presented in Fig.…”

Section: Resultsmentioning

confidence: 99%

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Investigation on the transformation behaviours of Fe-bearing minerals of coal in O₂/CO₂ combustion atmosphere containing H₂O

Huang

Xin

et al. 2021

RSC Adv.

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Section: Fe-containing Phases Of Ashes Produced From Dtf Experimentssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Investigation on the transformation behaviours of Fe-bearing minerals of coal in O₂/CO₂ combustion atmosphere containing H₂O

Huang

Xin

et al. 2021

RSC Adv.

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“…In the past decade, the research group at the State Key Laboratory of Coal Combustion has conducted a series of studies on the effects of CO 2 and H 2 O on pyrite transformation, − shedding more light on the effects of oxyfuel combustion. Thermogravimetric analyses showed that pure pyrite behaved kinetically different in CO 2 and N 2 in the range of 948–1073 K, although the decomposition solid products had similar mineralogy.…”

Section: Transformation Of Mineral Mattermentioning

confidence: 99%

A Comprehensive Review of Ash Issues in Oxyfuel Combustion of Coal and Biomass: Mineral Matter Transformation, Ash Formation, and Deposition

et al. 2021

Energy Fuels

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To alleviate the global warming issue, various CO 2 abatement technologies have been proposed. As one of the leading options for CO 2 capture in power plants mostly firing coal and biomass, the oxyfuel combustion technology has been actively developed for decades. Progress at different stages of the development has been continuously updated in several reviews. However, they usually cover a wide range of topics, which vary significantly in detail. The ash issues are very critical to the design and operation of oxyfuel boilers, but may be one of the most controversial topics. The knowledge is widely scattered in different research articles, and a relatively comprehensive description is not available in the published reviews. Therefore, it is difficult for one to have a clearer picture of this important topic. The present review attempts to provide a more complete understanding. It pays particular attention to experimental data, because they are the basis for model development and full-scale simulation. Different from previous reviews that presented limited information on mineral matter transformation under oxyfuel conditions, this Review summarizes most of the related results reported in the open literature. Data on ash formation and deposition in oxyfuel combustion are also updated. They are organized according to different combustion technologies, i.e., oxyfuel pulverized fuel combustion (oxy-PFC) and oxyfuel fluidized bed combustion (oxy-FBC). By correlating between the three aspects, an in-depth understanding of ash issues in oxyfuel combustion may be achieved. At the end of this Review, key messages regarding mineral matter transformation, ash formation and deposition in oxyfuel combustion, and future research needs are presented.

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“…10). It can be expected that reactions (9) and (10) [45]. As a result, the interaction between minerals (CaO, Al 2 O 3 and SiO 2 ) was promoted and more gehlenite was generated.…”

Section: Morphological Characterization and Mineral Compositionsmentioning

confidence: 99%

Effect of H2O on the volatilization characteristics of arsenic during isothermal O2/CO2 combustion

Zou

Wang

Liu

et al. 2019

International Journal of Greenhouse Gas Control

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The effect of H 2 O on the volatilization behavior of arsenic in coal was studied under O 2 /CO 2 combustion conditions at 800-1300 ºC, which covers the effective range of coal combustion temperatures appropriate for conventional coal combustion technologies. By controlling the combustion time of coal, the volatilization percentage and rate of As versus time were obtained. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses were used to study the evolution of minerals with and without H 2 O under O 2 /CO 2 combustion conditions. The effect of CO 2 on As volatilization was first investigated and it was found that increasing CO 2 concentrations inhibits the volatilization of As, with this effect decreasing with increasing temperature. When a fraction of the CO 2 was replaced with H 2 O, the volatilization of As increased, but the positive effect of H 2 O also decreased with increasing temperature. The volatilization percentage of As with 30% H 2 O was 6.1% higher than that without H 2 O at 800 ºC, while it was only 2.7% higher at 1300 ºC. When the concentration of H 2 O increased from 0 to 30%, the peak value of the As volatilization rate increased and the time needed to reach the peak value decreased. The volatilization characteristics of As for three coals were very similar, which demonstrates that the effect of H 2 O was not limited to only one specific coal. IntroductionCoal combustion accounts for about 70% of Chinese power generation and this situation is unlikely to change in the near future [1]. Pollutants from coal combustion are responsible for numerous environmental problems [2,3]. Given its nature as a semi-volatile toxic metal, most of the arsenic (As) in coal will volatilize during combustion and be found in fly ash, bottom ash and the gas phase as the flue gas cools down, and some of it will finally be emitted into the atmosphere [4,5]. The release of As is attracting increasing attention because it not only affects several human organs, but also interferes with the immune system [6].The volatilization and partitioning behavior of As is influenced by several factors, including the combustion temperature and combustion atmosphere [7][8][9][10][11]. In O 2 /CO 2 combustion, the CO 2 concentration in the furnace can reach 60%~80% or more [12][13][14][15], which is significantly higher than that in air fired combustion. Zhuang and Pavlish [16] studied the fate of As in a pilot-scale furnace during O 2 /CO 2 combustion, and found that the concentration of As in fly ash was lower than that in O 2 /N 2 combustion. While for a bench-scale fluidized bed study, Roy et al. [17] found that there was little difference in the volatilization of As between O 2 /CO 2 combustion and O 2 /N 2 combustion at 21% oxygen. However, Liu et al. [8] conducted combustion experiments in a customized isothermal thermogravimetric system, and concluded that high concentrations of CO 2 in oxy-fuel atmosphere inhibited the volatilization of As as compared to air at a low temperature, but that the volatilization r...

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Effect of H2O on pyrite transformation behavior during oxy-fuel combustion

Cited by 31 publications

References 43 publications

Investigation on the transformation behaviours of Fe-bearing minerals of coal in O₂/CO₂ combustion atmosphere containing H₂O

Investigation on the transformation behaviours of Fe-bearing minerals of coal in O₂/CO₂ combustion atmosphere containing H₂O

A Comprehensive Review of Ash Issues in Oxyfuel Combustion of Coal and Biomass: Mineral Matter Transformation, Ash Formation, and Deposition

Effect of H2O on the volatilization characteristics of arsenic during isothermal O2/CO2 combustion

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Effect of H2O on pyrite transformation behavior during oxy-fuel combustion

Cited by 31 publications

References 43 publications

Investigation on the transformation behaviours of Fe-bearing minerals of coal in O2/CO2 combustion atmosphere containing H2O

Investigation on the transformation behaviours of Fe-bearing minerals of coal in O2/CO2 combustion atmosphere containing H2O

A Comprehensive Review of Ash Issues in Oxyfuel Combustion of Coal and Biomass: Mineral Matter Transformation, Ash Formation, and Deposition

Effect of H2O on the volatilization characteristics of arsenic during isothermal O2/CO2 combustion

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Investigation on the transformation behaviours of Fe-bearing minerals of coal in O₂/CO₂ combustion atmosphere containing H₂O

Investigation on the transformation behaviours of Fe-bearing minerals of coal in O₂/CO₂ combustion atmosphere containing H₂O