Application of the FactSage to Predict the Ash Melting Behavior in Reducing Conditions

Li, Hanxu; Ninomiya, Yoshihiko; Zhou, Dong; Zhang, Mingxu

doi:10.1016/s1004-9541(07)60012-3

Cited by 64 publications

(36 citation statements)

References 16 publications

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“…Researchers have explored the microscopic morphological variations compared to different temperatures (300-1873 K) and they have categorized the deformation progress into three stages: sintering stage, primarily fusion stage, and free fluid stage [15,16]. Furthermore, most researchers agree that the operation temperature should be above FT [17,18]. However, the operation temperature of the circulation fluidized bed is 1073-1373 K, which is lower than FT and falls under the sintering stage.…”

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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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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“…Jak [22] predicted the coal ash fusion characteristics of a suite of coals by employing the multicomponent system Al-Ca-Fe-O-Si with the help of FACT thermodynamic computer package. Li et al [23] used Factsage to predict the ash fusion characteristics of certain coals under reducing conditions. While other researchers have employed this technique to predict coal ash fusibility [24], mineral element evaporation [25] and [26][27][28], research on its applicability to biomass ash and blends is somewhat sparse.…”

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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“…Alguns trabalhos científi cos exploram o uso de ferramentas como os programas FactSage, F*A*C*T -(Facility for the Analysis of Chemical Thermodynamics) ou ChemSage para avaliar e prever o comportamento dos materiais refratários quando expostos a severas condições de uso [1,4,16,17,[20][21][22]. FactSage é um programa desenvolvido em conjunto pelos grupos CRCT -(Center for Research in Computacional Thermochemistry -Montreal) and GTT-Technologies (Aachen) e é o resultado da fusão entre os programas FACT-Win/F*A*C*T e ChemSage/ SOLGAMIX.…”

Section: Simulações Termodinâmicasunclassified

Simulação termodinâmica e sua aplicação na avaliação do desempenho de materiais refratários

Luz

Pandolfelli

2011

Cerâmica

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INTRODUÇÃODados e cálculos termodinâmicos são importantes para entender o fenômeno de corrosão e oxidação de refratários. Estes cálculos são baseados na minimização da energia livre do sistema, sendo possível deduzir a natureza das fases sólidas, líquidas e gasosas, assim como, sua composição química e reação na condição de equilíbrio [1,2].A corrosão de materiais refratários ocorre normalmente a elevadas temperaturas e sob condições extremas de uso, as quais são difi cilmente reproduzidas em escala laboratorial. A forma mais efi ciente de se avaliar o fenômeno de corrosão envolve: cálculos termodinâmicos; fatores cinéticos; ensaios

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Application of the FactSage to Predict the Ash Melting Behavior in Reducing Conditions

Cited by 64 publications

References 16 publications

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

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

Simulação termodinâmica e sua aplicação na avaliação do desempenho de materiais refratários

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