Effect of different additives on ash fusion characteristic and mineral phase transformation of iron-rich Zhundong coal

Wang, Yibin; Li, Liangyu; An, Qiwei; Tan, Houzhang; Li, Peng; Peng, Jianghua

doi:10.1016/j.fuel.2021.121841

Cited by 37 publications

(10 citation statements)

References 34 publications

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“…The results indicated that Fe 2 O 3 extent shows limited influence on decreasing ash fusion characteristic temperatures for iron-rich coal. Wang et al [29] explored the effects of additive type and blending ratio on the fusion characteristic and the mineral phase transformation of iron-rich Zhundong coal and gave the best suggestions for adding proportions. However, despite extensive research on the potential and efficacy of various additives in regulating the fusion characteristics of coal ash, [30] there is a notable gap in understanding the behavior of iron-based minerals found in coal, such as hematite, magnetite, and wurstite.…”

Section: Introductionmentioning

confidence: 99%

“…[14][15][16] The content of Fe 2 O 3 in coal ash composition significantly influences the AFT, and the complex behavior of iron, including changes in its valence state, further complicates the ash melting process. [17][18][19] Iron is predominantly present in coal as various iron-based minerals, such as wurstite (FeO), hematite (Fe 2 O 3 ), pyrite (FeS 2 ), magnetite (Fe 3 O 4 ), and siderite (FeCO 3 ). [20,21] Liu et al [22] measured the AFTs of 34 synthetic ashes and took into account the effect of the Fe element valence state.…”

Section: Introductionmentioning

confidence: 99%

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Regulation Mechanism of Ash Fusion of Iron‐Rich Coal in Xinjiang with Different Additives

Lv,

Zhang,

Wang

et al. 2024

ChemistrySelect

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To realize the high‐efficiency utilization of iron‐rich coal (ZC), it is necessary to conduct in‐depth research on its ash fusion characteristics and regulation mechanism. In this paper, the fusion temperature test of ZC coal ash was first carried out in a weak reducing atmosphere, and diatomite (GZT) and Naomaohu high‐calcium coal (NMH) were selected as additives. The results show that the four characteristic temperatures of ZC coal ash are all low under weak reducing conditions. The addition of NMH ash lowered the fusion temperature of ZC coal ash, while the GZT ash increased the fusion temperature to varying degrees. When the addition ratio of NMH ash is less than 40 %, the effect of increasing the difference between the deformation temperature and flow temperature of ZC coal ash is still positive. The addition of NMH ash made the slag system generate a high content of calcium‐magnesium feldspar and calcium‐iron feldspar, decreasing the fusion temperature of the blended coal ash. The addition of GZT ash increased the content of SiO2 in the slag system and promoted the increase of the iron‐pyroxene content, and the formation of the iron‐aluminum pyroxene and cordierite mineral phases, thereby increasing the coal ash fusion temperature.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Regulation Mechanism of Ash Fusion of Iron‐Rich Coal in Xinjiang with Different Additives

Lv,

Zhang,

Wang

et al. 2024

ChemistrySelect

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“…Trace metals, such as iron, are widely present in practical fuels, especially in coal and biomass fuels . Meanwhile, some iron-containing compounds, such as ferrocene [Fe(C 5 H 5 ) 2 ] and iron pentacarbonyl [Fe(CO) 5 ], can be used as fuel additives to promote soot oxidation. − The role of iron in the flame synthesis of carbon nanotube has also attracted numerous studies for its notable catalytic effect. , Moreover, some studies − have shown that the presence of iron could also affect the formation characteristics of soot, a byproduct of incomplete combustion of hydrocarbon fuels that can result in air pollution and global warming , and cause damage to human health, especially respiratory diseases. − Furthermore, according to the exposure experiments on adult rats by Zhou et al, the synergistic effect of iron and soot particles would lead to more hazardous damage to the cardiopulmonary system compared with the impact of pure iron particles and soot particles.…”

Section: Introductionmentioning

confidence: 99%

Effects of Iron Addition on the Collision of Polycyclic Aromatic Hydrocarbon Clusters: A Molecular Dynamics Study

2023

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In this work, soot particle size distributions in iron-doped premixed ethylene flames are examined using scanning mobility particle sizer measurements. It is found that iron addition promotes the growth in soot particle size, and the enhanced particle coagulation is inferred to be an important reason. To support that, the influence of iron addition on the coagulation of polycyclic aromatic hydrocarbon (PAH) clusters, the analogue of incipient soot particles, is further investigated using molecular dynamics simulations. Based on the results of hundreds of binary head-on collision simulations, the collision between two coronene–Fe–coronene dimers is found to have a significantly higher coagulation efficiency than that between two coronene dimers. However, this enhancement effect weakens as the size of the PAH monomer increases. Although the coagulation efficiency can be increased by iron addition, the collision frequency is almost unaffected, as revealed from the binary off-central collision simulations. Moreover, the simulation results of coronene cluster growth via coagulation show that iron addition promotes coronene cluster growth, leading to larger cluster size, which may explain the larger soot particle size observed in iron-doped flames.

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“…[9][10][11] The increase of iron content in coal ash has a significant effect on its melting behavior. 12,13 Usually, iron in coal mainly exists in the form of iron-based minerals, and common ironbased minerals include pyrite and siderite. 14 During the gasification process, the pyrite enclosed within the coal matrix is subjected to a higher temperature compared with the pyrite on the surface.…”

Section: Introductionmentioning

confidence: 99%

“…17 Fayalite, iron spinel, almandine garnet, clinopyroxene, and other ironcontaining minerals are the primary products formed under high-temperature conditions. [18][19][20][21] Wang et al 12,22 discovered that minerals such as pyroxene with low melting points, pyroxene rich in aluminum, and diopside are formed in iron-rich coal. These iron-containing pyroxenes can form low-temperature compounds at high temperatures, ultimately increasing the ash melting ratio of coal.…”

Section: Introductionmentioning

confidence: 99%

Ash fusion characteristics of iron‐rich coal in Xinjiang under different atmospheres and the influence mechanism of adding red mud and pipeline scale

Lv,

Wang,

Zhang

et al. 2023

Asia-Pacific J Chem Eng

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To realize the high‐efficiency utilization of iron‐rich coal, it is necessary to conduct in‐depth research on the ash fusion characteristics and regulation mechanism. In this paper, the ash fusion temperature test of iron‐rich coal in Xinjiang (ZC) under different atmospheres was first carried out. Then, red mud (HJ) from Huajin Aluminum Industry and black water pipe scale (GDG) were selected as the additives. After the same ashing procedure, the two additives were mixed with iron‐rich coal ash in different proportions to realize the regulation of the chemical composition of the coal ash to improve the ash fusion characteristic. The ash fusion temperature (AFT) experiment was carried out in the automatic ash melting point analyzer, and high‐temperature ash melting slags at different temperatures were prepared. The mineral phases of coal ash and slag were characterized by XRD and compared with the Factsage simulation calculation results to reveal the influence mechanism of coal ash fusion temperature. The result shows that the fusion temperature of ZC iron‐rich coal ash is significantly different between oxidizing atmosphere and weak reducing atmosphere. Compared with the oxidizing atmosphere, the four characteristic temperatures of ZC iron‐rich coal ash are significantly lower under weak reducing conditions, and the difference is about 150°C. The addition of red mud and pipeline scale increased the fusion temperature of ZC coal ash to varying degrees. The addition of HJ ash has little effect on the deformation temperature of ZC coal ash, while the addition of different proportions of HJ ash significantly increases the flow temperature of ZC coal ash. When the addition ratio of HJ ash is 40%, the flow temperature FT of ZC coal ash increases most obviously, which is about 50°C. The addition of HJ ash and GDG ash will lead to an increase in the content of iron‐containing spinel, thereby increasing the ash flow temperature.

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Effect of different additives on ash fusion characteristic and mineral phase transformation of iron-rich Zhundong coal

Cited by 37 publications

References 34 publications

Regulation Mechanism of Ash Fusion of Iron‐Rich Coal in Xinjiang with Different Additives

Regulation Mechanism of Ash Fusion of Iron‐Rich Coal in Xinjiang with Different Additives

Effects of Iron Addition on the Collision of Polycyclic Aromatic Hydrocarbon Clusters: A Molecular Dynamics Study

Ash fusion characteristics of iron‐rich coal in Xinjiang under different atmospheres and the influence mechanism of adding red mud and pipeline scale

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