The fusion mechanism of complex minerals mixture and prediction model for flow temperature of coal ash for gasification

Shi, Wenju; Laabs, Marcel; Reinmöller, Markus; Kong, Lingxue; Vassilev, Stanislav V.; Guhl, Stefan; Bai, Jin; Meyer, Bernd; Li, Wen

doi:10.1016/j.fuel.2021.121448

Cited by 14 publications

(6 citation statements)

References 32 publications

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“…A high ionic potential element with high tendency combined with oxygen can generate high MP silicate and alumino-silicate stable networks and results in an increase in AFT, while the low ionic potential element can convert a bridge–oxygen bond into a no bridge–oxygen bond and result in AFT decrease . Recently, several correlations to predict the AFTs according to the ionic potential have been explored. ,, Li et al presented a predicting model between FT and its average mole ionic potentials of Mg 2+ , Fe 2+ , Ca 2+ , and Al 3+ ( I normala normalv normale normalr normalg normale = normalΣ M i I i normalΣ M i , where M i stands for the each ionic mole fraction and I i stands for the ionic potential of each ion). Xiao et al added the ionic potentials of K + , Na + , Ti 4+ , and Mg 2+ and obtained the correlation model between the FT and its C MP ( C normalM normalP = normalΣ w i I i n i r i normalΣ normalw normali n i , where w i is the mass fraction of the corresponding metal oxide after normalization, n i is the relative molecular mass of the corresponding metal oxide, z i is the charge number, and r i is the ionic radius of the corresponding metal oxide) normalF normalT = 509.12 + 17.98 I normala normalv normale normalr normala normalg normale …”

Section: Resultsmentioning

confidence: 99%

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Correlation between the Flow Temperature and Mineral Factor for Coal Ashes Based on FactSage Calculation

2023

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To find a simple method to predict the ash flow temperature (FT) based on FactSage calculation, 69 coal ash samples were selected to explore the correlation between the FT and its mineral factor (MF) at a given temperature. An approximate linear relationship was found between ash FT and its MF: FT = 0.64MF + 1332, with a related coefficient value of 0.94 and a standard deviation of 25.77 °C. Ten ash samples were used to investigate its reliability. The calculated FTs were consistent with experimental FTs in the error range of measurement, and the correlation might be more reliable for low iron and low calcium coal.

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Section: Resultsmentioning

confidence: 99%

“…29 Recently, several correlations to predict the AFTs according to the ionic potential have been explored. 14,15,30…”

Section: Comparison Between Differentmentioning

confidence: 99%

Correlation between the Flow Temperature and Mineral Factor for Coal Ashes Based on FactSage Calculation

2023

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“…At this time, because the density of mullite was higher than that of the liquid melt, mullite sank in the melt. Therefore, the existence of refractory mullite led to the ash melting process following the “melting–sinking–dissolving” mechanism, as shown in Figure . Meanwhile, Ge et al conducted research on the impact of the Ca–Fe composite flux on coal ash slag fluidity .…”

Section: Effect Of Alkali-rich Industrial Solid Waste Addition On Coa...mentioning

confidence: 99%

Review and Perspectives of Ash Slag Fluidity during Co-gasification of Industrial Solid Waste and Coal: Characteristics, Chemistry, Controlling Mechanisms, and Regulation

Zhang,

Song,

et al. 2024

Energy Fuels

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The stable fluidity of slag at a high temperature is crucial for the long-period operation of an entrained-flow gasifier. The diversity and difference of coal ash make it difficult to meet the requirements for stable slagging in a gasifier. Consequently, coal blending or adding flux has been employed in the industry to improve the fluidity of coal ash slag. As a carbon-containing matrix, industrial solid waste is a kind of energy substance. Utilizing existing industrial gasifiers to blend combustion of industrial solid waste can not only transform industrial solid waste into fuel but also improve the entrained-flow gasifier slagging performance using the unique ash chemical composition of industrial solid waste. Therefore, sorting out the effect of industrial solid waste on coal ash slag fluidity can not only clarify the regulating mechanism of coal ash slagging but also provide some theoretical support for the large-scale consumption of industrial solid waste. In this review, the effects of acid-and alkali-rich industrial solid wastes and coal co-gasification on coal ash slag fluidity were reviewed from the perspectives of ash melting characteristics and viscosity−temperature characteristics, and the effect mechanism of SiO 2 , Al 2 O 3 , SiO 2 / Al 2 O 3 (S/A), CaO, Fe 2 O 3 , and CaO−Fe 2 O 3 (Ca−Fe) compound fluxes on coal ash slag fluidity were elaborated from the viewpoint of mineral evolution and microstructure. Meanwhile, studies on the ash slag fluidity during the co-gasification of industrial solid waste and coal were prospected, which could afford theoretical guidance for the stable slagging of an entrained-flow gasifier and the resourceful treatment of industrial solid waste.

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“…Zhang et al 21 studied the effect of adding coal indirect liquefaction residue (LR) on the melting fluidity of coal ash through AFT and explained the melting mechanism of coal ash by using the change rate of ash cone height. Shi et al 22 analyzed fusion mechanisms of coal ashes with the help of thermomechanical analysis, high‐temperature scanning electron microscope, and predicted FT by chemical composition according to the ash fusion characteristics and mechanism. Du and Xu et al 17,18 observed the morphological changes of the ash samples at high temperatures through the heating stage microscope; then, the flow characteristics of samples were evaluated by their area shrinkage.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on flow properties of coal ash slag based on the image measurement method

Luo

Zhou

Wang

et al. 2021

Asia-Pacific J Chem Eng

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This paper aims to reveal the effect of adding biomass ash on the flow characteristics of Zhundong (ZD) coal ash. A new visual image measurement method for the flowability of coal ash was established. Furthermore, scanning electron microscopy (SEM) and x-ray diffraction (XRD) were applied to analyze the influence of surface morphology and mineral component on the fusion fluidity of the samples. The results show that the flow properties of ZD ash are improved to varying degrees after adding maize straw (MS) ash. As the blending ratio increases, the improvement of flow velocity is higher. The critical flow temperature (T C ) of the samples was calculated. The T C of ZD ash was 1249 C, which decreased with the addition of MS ash. The characterization

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The fusion mechanism of complex minerals mixture and prediction model for flow temperature of coal ash for gasification

Cited by 14 publications

References 32 publications

Correlation between the Flow Temperature and Mineral Factor for Coal Ashes Based on FactSage Calculation

Correlation between the Flow Temperature and Mineral Factor for Coal Ashes Based on FactSage Calculation

Review and Perspectives of Ash Slag Fluidity during Co-gasification of Industrial Solid Waste and Coal: Characteristics, Chemistry, Controlling Mechanisms, and Regulation

Experimental study on flow properties of coal ash slag based on the image measurement method

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