The effect of solids and phase compositions on viscosity behaviour and TCV of slags from Australian bituminous coals

Ilyushechkin, Alexander; Hla, San Shwe; Roberts, Daniel G.; Kinaev, N. N.

doi:10.1016/j.jnoncrysol.2010.12.004

Cited by 79 publications

(33 citation statements)

References 11 publications

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“…For example, FactSage, an integrated software package that combines thermochemical databases with Gibbs energy minimization software [119,120], is widely used to calculate chemical equilibria in slag systems. It has been used to predict the formation of solid phases in basic oxygen furnace slag [50], estimate coal ash fusion temperatures [121], model the effect of solid phase formation on viscosity in coal ash slags [52,85,111,112,114,[122][123][124] and petroleum coke-coal blend slags [125], and assess the effect of additives on coal ash slag viscosity [15,126]. MTDATA is another CALPHAD-based software tool that has been used to estimate coal fusibility [127] and ash fusion temperatures [128].…”

Section: Thermophysical Modeling Of Coal Ash Slagsmentioning

confidence: 99%

Correlation between the critical viscosity and ash fusion temperatures of coal gasifier ashes

Hsieh

Kwong

Bennett

2016

Fuel Processing Technology

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Coal gasification yields synthesis gas, an important intermediate in chemical manufacturing. It is also vital to the production of liquid fuels through the Fischer-Tropsch process and electricity in Integrated Gasification Combined Cycle power generation. Minerals naturally present in coal become molten in entrained-flow slagging gasifiers. Molten coal ash slag penetrates and dissolves refractory bricks, leading to costly plant shutdowns. The extent of coal ash slag penetration and refractory brick dissolution depends on the slag viscosity, the gasification temperature, and the composition of slag and bricks. We measured the viscosity of several synthetic coal ash slags with a high-temperature rotary viscometer and their ash fusion temperatures through optical image analysis. All measurements were made in a carbon monoxide-carbon dioxide reducing atmosphere that approximates coal gasification conditions. Empirical correlation models based on ash fusion temperatures were used to calculate critical viscosity temperatures based on the coal ash compositions. These values were then compared with those obtained from thermodynamic phase-transition models. An understanding of slag viscosity as a function of ash composition is important to reducing refractory wear in slagging coal gasifiers, which would help to reduce the cost and environmental impact of coal for chemical and electricity production.Published by Elsevier B.V.

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Section: Thermophysical Modeling Of Coal Ash Slagsmentioning

confidence: 99%

Correlation between the critical viscosity and ash fusion temperatures of coal gasifier ashes

Hsieh

Kwong

Bennett

2016

Fuel Processing Technology

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“…Earlier studies have explored the influence of components on ash fusibility or viscosity [20][21][22], but not much data is available on sintering characteristics. It has been concluded that high SiO 2 /Al 2 O 3 ratios (S/As) and low concentrations of basic oxides account for the high ash fusion temperatures of most Australian bituminous coal ashes [23].…”

Section: Introductionmentioning

confidence: 99%

Effects of SiO2/Al2O3 Ratios on Sintering Characteristics of Synthetic Coal Ash

Zhou

Meng

et al. 2017

Energies

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This article explores the effects of SiO 2 /Al 2 O 3 ratios (S/A) on sintering characteristics and provides guidance for alleviating ash depositions in a large-scale circulation fluidized bed. Five synthetic coal ash (SCA) samples with different S/As were treated in a muffle furnace for 12 h at different temperatures (from 773 K to 1373 K, in 100 K intervals). The morphological and chemical results of the volume shrinkage ratio (VSR), thermal deformation analysis by dilatometer (DIL), scanning electron microscope (SEM), X-ray photoelectron spectrometer (XPS), and X-ray diffraction (XRD) were combined to describe the sintering characteristics of different samples. The results showed that the sintering procedure mainly occurred in the third sintering stage when the temperature was over 1273 K, accompanied with significant decreases in the VSR curve. Excess SiO 2 (S/A = 4.5) resulted in a porous structure while excess Al 2 O 3 (S/A = 0.5) brought out large aggregations. The other three samples (S/A = 1.5, 2.5, 3.5) are made up of an amorphous compacted structure and are composed of low fusion temperature materials (e.g., augite and wadsleysite.). Sintering temperatures first dramatically decrease to a low level and then gradually rise to a high level as S/A increases, suggesting that Al 2 O 3 -enriched additives are more effective than SiO 2 -enriched additives in alleviating depositions.

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“…Predictions of crystallization dynamics in slags are essential to understand the flow characteristics of slag. Despite increasing attention on crystals in coal slags, the effects of factors such as temperature and cooling rate [4][5][6] on crystallization behavior have not been extensively studied. Several researchers [5,11] have investigated the influence of quenching temperature on crystallization of coal slags through semi-quantitative analysis of XRD to determine the volume of crystals.…”

Section: Introductionmentioning

confidence: 99%

Influence of isothermal temperature and cooling rates on crystallization characteristics of a synthetic coal slag

Wang

Whitty

Guan

et al. 2014

Fuel

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The effect of solids and phase compositions on viscosity behaviour and TCV of slags from Australian bituminous coals

Cited by 79 publications

References 11 publications

Correlation between the critical viscosity and ash fusion temperatures of coal gasifier ashes

Correlation between the critical viscosity and ash fusion temperatures of coal gasifier ashes

Effects of SiO2/Al2O3 Ratios on Sintering Characteristics of Synthetic Coal Ash

Influence of isothermal temperature and cooling rates on crystallization characteristics of a synthetic coal slag

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