Relationship between coal ash composition and ash fusion temperatures

Liu, Bo; He, Qihui; Jiang, Z.; Xu, Renfu; Hu, Baixing

doi:10.1016/j.fuel.2012.06.046

Cited by 191 publications

(115 citation statements)

References 30 publications

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“…(Liu et al 2013). In the present case, the S/A ratio of three samples are higher than 2.0 (3.08, 2.70 and 2.99 for M2, M12, M24) respectively, and for M43, the S/A value is 1.99.…”

Section: Ash Fusion Temperaturescontrasting

confidence: 43%

Distribution of mineral species in different coal seams of Talcher coalfield and its transformation behavior at varying temperatures

Banerjee

Mishra

Mohanty

et al. 2016

Int J Coal Sci Technol

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Mineral phase characterization and thorough understanding of its transformation behavior during combustion are imperative to know the potential utilization of coal in the thermal industries. The primary objective of this work is to analyze the quality of Indian Coals and obtain their mineral species-specific information at different depths. The samples were obtained from Talcher Coalfield, Odisha, India. Coal from four seam sections in the Talcher coalfield, India are mainly high ash coal ([50 %) and volatile matter deceases along with the seam depth. XRD results show that the major mineral phases present in the coal are quartz and kaolinite. Siderite, illite, and anatase were found in minor quantities. It has been observed that the clay minerals (kaolinite, silimanite, illite) decompose at higher temperature and traces of dolomite, mullite, hematite etc. are formed during the process of combustion. Among the four seams (M2, M12, M24 and M43) studied, ash of M43 has high Al 2 O 3 %, TiO 2 % and K 2 O% content and low SiO 2 %, CaO% and MgO% content. High acidto-base ratios contributed to high ash fusion temperatures (IDT [ 1500°C) and low slagging potential of the coals studied. Relatively low fouling index (\0.3) was estimated for all the coal seams studied. Furthermore, thermodynamic modeling software, FactSage, have been used to envision the mineral phase transformations that take place between 800 and 1500°C during coal combustion.

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“…(Liu et al 2013). In the present case, the S/A ratio of three samples are higher than 2.0 (3.08, 2.70 and 2.99 for M2, M12, M24) respectively, and for M43, the S/A value is 1.99.…”

Section: Ash Fusion Temperaturescontrasting

confidence: 43%

Distribution of mineral species in different coal seams of Talcher coalfield and its transformation behavior at varying temperatures

Banerjee

Mishra

Mohanty

et al. 2016

Int J Coal Sci Technol

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“…However, the complex chemical compositions of industrial coal ashes bring obstacles in quantitatively exploring the role of individual components. Liu B simplified the industrial coal ashes as synthetic coal ashes (SCA) for quantitatively controlling ash composition [26]. Although other researchers have adopted this simplification and found it to be satisfactory [27], the effects of individual oxides on morphology and chemical compositions need to be explored more specifically.…”

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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“…Commonly used analytical techniques include testing the fusion characteristics of ash, measurements of ash viscosity and estimation of indices based on ratios of elemental oxides [8][9][10]. Despite the limitations associated with these techniques, they are still widely used to assess the tendency of various coals to slag and foul boiler heat transfer surfaces and have also been extended to biomass fuels for evaluation of the same [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Prediction of biomass ash fusion behaviour by the use of detailed characterisation methods coupled with thermodynamic analysis

Rizvi

Xing

Pourkashanian

et al. 2015

Fuel

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ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. AbstractAsh deposition such as slagging and fouling on boiler tube surfaces is an inevitable, though undesirable consequence of burning solid fuels in boilers. The role of fuel characteristics, in affecting the form and severity of the problem, is significant. In recent years, biomass fuels have gained increasing popularity as an environmentally friendly source of energy in power plants all over the world. This study is based on characterising the fusion behaviour of four biomass fuels (pine wood, peanut shells, sunflower stalk and miscanthus) using ash fusion temperature (AFT) tests, simultaneous thermal analysis (STA) of fuel ashes, calculation of empirical indices and predicting ash melting behaviour with the help of thermodynamic equilibrium calculations. The AFT results failed to show any clear trend between fusion temperature and high alkali content of biomass. STA proved useful in predicting the different changes occurring in the ash. Empirical indices predicted high slagging and fouling hazards for nearly all the biomass samples and this was supported by the possible existence of a melt phase at low temperatures as predicted by thermodynamic calculations.

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Relationship between coal ash composition and ash fusion temperatures

Cited by 191 publications

References 30 publications

Distribution of mineral species in different coal seams of Talcher coalfield and its transformation behavior at varying temperatures

Distribution of mineral species in different coal seams of Talcher coalfield and its transformation behavior at varying temperatures

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

Prediction of biomass ash fusion behaviour by the use of detailed characterisation methods coupled with thermodynamic analysis

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