Relationship between ash fusion temperatures of ashes from hard coal, brown coal, and biomass and mineral phases under different atmospheres: A combined FactSage™ computational and network theoretical approach

Reinmöller, Markus; Klinger, Mathias; Schreiner, Marcus; Gutte, Heiner

doi:10.1016/j.fuel.2015.01.036

Cited by 107 publications

(41 citation statements)

References 26 publications

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“…The ash samples of the A S-H mixture (Line 1) and A Z-H mixture (Line 2) in the SiO 2 -Al 2 O 3 -CaO ternary phase diagram calculated by FactSage were shown in Figure 7. 16,21,24 As could be seen from the diagram, A X and A H were distributed in the CaSiO 4 region of phase diagram, A Z and A S in mullite area, mullite and CaSiO 4 were high-MP minerals, resulting in higher AFTs. As could be shown from Line 1 that, with the increase of A H , A S-H mixed samples moved through three areas: 0-3.92% (mullite), 37.60-53.51% (anorthite), and 53.51-67.84% (gehlenite).…”

Section: Thermodynamic Calculation Of MIX Ashmentioning

confidence: 87%

“…The AFTs of four coals were high (FT > 1400 C). 24,25 The above reasons led to high AFTs of four kinds of raw coal. Al 2 O 3 was easy to react with SiO 2 to form the high MP mineral at high temperatures.…”

Section: Thermodynamic Calculationmentioning

confidence: 99%

“…HCC with high B/A value were A H (1.92) and A X (2.63); the main minerals at high temperature were maybe calcium oxide, calcium-mono silicates, and mixed silicates. 24,25 The above reasons led to high AFTs of four kinds of raw coal.…”

Section: Thermodynamic Calculationmentioning

confidence: 99%

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Regulation of ash fusion behaviors for high aluminum coal by high calcium coal addition

Xiao

2020

Asia-Pacific J Chem Eng

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To meet the requirement of liquid slag tapping entrained-flow gasification, two kinds of high ash fusion temperatures (AFTs) coals with significant difference in ash chemical composition (high aluminum coal: Al 2 O 3 > 38%, Sunjiahao coal, and Shajuzi coal; high calcium coal: CaO > 35%, Hebi coal, and Xinjiang coal) were selected. The ash fusion behaviors of blending coal were investigated. The results showed that blending coal could significantly reduce the AFTs of high-AFT coal. The formation of high melting point minerals led to the increase of AFTs (high aluminum coal: mullite, corundum, and cristobalite; high calcium coal: lime and periclase). Xinjiang coal reduced AFTs more obviously than that of Hebi coal because of the differences in the total amount of alkali oxides, Fe 2 O 3 and MgO. The effect of CaO on AFTs was determined by the amount of CaO. CaO, Fe 2 O 3 , and MgO promoted the formation of low-melting eutectic [anorthite, gehlenite, spinel, pyrope, and ringwoodite (Fe-rich)] and made AFTs low when the mass ratios of high calcium coal were low. On the contrary, the high content of CaO increased AFTs.FactSage7.0 software is a very effective way to explore the effect of mineral transformation on AFTs. K E Y W O R D Scoal blending, coal preparation principle, high ash fusion temperature, modification mechanism

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Section: Thermodynamic Calculation Of MIX Ashmentioning

confidence: 87%

Section: Thermodynamic Calculationmentioning

confidence: 99%

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Regulation of ash fusion behaviors for high aluminum coal by high calcium coal addition

Xiao

2020

Asia-Pacific J Chem Eng

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“…During pulverized coal combustion, entrained fly ash particles can selectively deposit on furnace walls and can produce slagging deposits, depending on their composition, temperature, atmosphere and other factors [1][2][3][4][5][6]. The prevention or reduction of boiler slagging is always a concern in the coal combustion research field.…”

Section: Introductionmentioning

confidence: 99%

“…The main ingredients of ash deposition in utility boilers are aluminosilicates [6,[13][14][15][16]. Recent experimental research on ash depositions has shown the importance of determining aluminosilicate components in ash to understand the slagging mechanism of coal blend combustion [3,15,17].…”

Section: Introductionmentioning

confidence: 99%

Distribution of Clay Minerals in Light Coal Fractions and the Thermal Reaction Products of These Clay Minerals during Combustion in a Drop Tube Furnace

et al. 2016

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Abstract:To estimate the contribution of clay minerals in light coal fractions to ash deposition in furnaces, we investigated their distribution and thermal reaction products. The light fractions of two Chinese coals were prepared using a 1.5 g¨cm´3 ZnCl 2 solution as a density separation medium and were burned in a drop-tube furnace (DTF). The mineral matter in each of the light coal fractions was compared to that of the relevant raw coal. The DTF ash from light coal fractions was analysed using hydrochloric acid separation. The acid-soluble aluminium fractions of DTF ash samples were used to determine changes in the amorphous aluminosilicate products with increasing combustion temperature. The results show that the clay mineral contents in the mineral matter of both light coal fractions were higher than those in the respective raw coals. For the coal with a high ash melting point, clay minerals in the light coal fraction thermally transformed more dehydroxylation products compared with those in the raw coal, possibly contributing to solid-state reactions of ash particles. For the coal with a low ash melting point, clay minerals in the light coal fraction produced more easily-slagging material compared with those in the raw coal, playing an important role in the occurrence of slagging. Additionally, ferrous oxide often produces low-melting substances in coal ash. Due to the similarities of zinc oxide and ferrous oxide in silicate reactions, we also investigated the interactions of clay minerals in light coal fractions with zinc oxide introduced by a zinc chloride solution. The extraneous zinc oxide could react, to a small extent, with clay minerals in the coal during DTF combustion.

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Influence of Fe₂O₃‐FeS on the structure of iron‐containing clusters in aluminosilicate melts

Jiao

Mao

Zhang

et al. 2023

Asia-Pacific J Chem Eng

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Iron compounds addition on the melt is a more complex issue. Uncertainties in industrial applications are caused by crystallization and depolymerization phenomena. Most of the current studies have discussed FeO and Fe2O3, ignoring the influence of FeS in the glass structure. This study designed and simulated artificial ash close to coal ash to interact with the glass melt at high temperatures. Coulomb titration, X‐ray diffraction (XRD), and Raman analyses were carried out to determine the percentage and composition of crystalline and noncrystalline materials in the glass. Samples of FeS‐Fe2O3 were subjected to the enumeration of the glass structure and quantitative calculations of the degree of polymerization. The results showed that 15‐wt% Fe2O3 promoted crystallization in the system and accelerates the depolymerization of FeS. The introduction of FeS increases the amorphous materials, and the obtained amorphous materials are Si dominated network structures and [SiO4]‐[FeO4]‐[SiO4] clusters. The network tends to change from [FeOn] and [AlO4] to [SiO4]. In addition, aluminosilicate may enter FeS particles and unreacted FeS may deposit on the aluminosilicate surface.

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Relationship between ash fusion temperatures of ashes from hard coal, brown coal, and biomass and mineral phases under different atmospheres: A combined FactSage™ computational and network theoretical approach

Cited by 107 publications

References 26 publications

Regulation of ash fusion behaviors for high aluminum coal by high calcium coal addition

Regulation of ash fusion behaviors for high aluminum coal by high calcium coal addition

Distribution of Clay Minerals in Light Coal Fractions and the Thermal Reaction Products of These Clay Minerals during Combustion in a Drop Tube Furnace

Influence of Fe₂O₃‐FeS on the structure of iron‐containing clusters in aluminosilicate melts

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Relationship between ash fusion temperatures of ashes from hard coal, brown coal, and biomass and mineral phases under different atmospheres: A combined FactSage™ computational and network theoretical approach

Cited by 107 publications

References 26 publications

Regulation of ash fusion behaviors for high aluminum coal by high calcium coal addition

Regulation of ash fusion behaviors for high aluminum coal by high calcium coal addition

Distribution of Clay Minerals in Light Coal Fractions and the Thermal Reaction Products of These Clay Minerals during Combustion in a Drop Tube Furnace

Influence of Fe2O3‐FeS on the structure of iron‐containing clusters in aluminosilicate melts

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Influence of Fe₂O₃‐FeS on the structure of iron‐containing clusters in aluminosilicate melts