Investigation on the sintering behaviors of low-temperature lignite ashes

Ji, Shaohua; Wang, Tao; Li, Zhenzhu; Fang, Huibin; Huang, Jiejie; Fang, Ytian

doi:10.1007/s10973-014-3941-x

Cited by 11 publications

(22 citation statements)

References 28 publications

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“…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]. Recent related literature has established ash chemical compositions under either an oxidizing atmosphere or a reductive atmosphere, based on Jincheng coal, Xiaolongtan (XLT), and Huolinhe (HLH) coal, respectively [24,25]. However, the complex chemical compositions of industrial coal ashes bring obstacles in quantitatively exploring the role of individual components.…”

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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“…The ionic potential of P 5+ (147 nm –1 ) is higher than that of Si 4+ (95 nm –1 ), 12 which results in its higher tendency to react with calcium than that of Si 4+ . It might be deduced that the following reactions occurred during heating: 12 , 14 , 24 , 27 …”

Section: Resultsmentioning

confidence: 99%

“…However, problems related to ash (e.g., agglomeration, de-fluidization, deposition, and slag formation) are generally found in fluidized-bed gasification processes. 24 …”

Section: Introductionmentioning

confidence: 99%

“…Sintering is the process of particle softening and surface flow under the driving force of reduction of free surface energy, which leads particles to adhere together. 24 Sintering behavior is mainly determined by the ash’s chemical composition 29 and affected by atmosphere and pressure. 24 The sintering characteristics are closely related to alkali-metal content (especially for Na 30 ).…”

Section: Introductionmentioning

confidence: 99%

“… 24 Sintering behavior is mainly determined by the ash’s chemical composition 29 and affected by atmosphere and pressure. 24 The sintering characteristics are closely related to alkali-metal content (especially for Na 30 ). Fan et al found that the sintering temperatures ( T s ) of Jincheng or Jiaozuo coal ashes decreased continuously with increasing percent of peanut shell ash (PHA), which resulted from the generation of low-melting-point (MP) potassium silicates (PHA < 20%), the fusion of sylvite, and the formations of adularia, potassium sulfide, and diopside (PHA ranges from 30% to 50%).…”

Section: Introductionmentioning

confidence: 99%

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Understanding Ash Sintering Variation Behaviors of Low-Rank Coals with Municipal Sludge Addition Based on Mineral Interactions

Yang

Wang²,

Liu³

et al. 2022

ACS Omega

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Co-gasification with coal provides an economically viable way to use sludge. To investigate the effect of municipal sludge (MS) on the sintering behaviors of low-rank coals (LRCs) and their modification mechanisms, the initial sintering temperature ( T s ) of three LRCs and their mixtures with MS addition were tested by a T s analyzer, an X-ray diffractometer, and FactSage calculation. The results show that the T s values of Xiaolongtan coal (XLT), Xiangyuan coal (XY), and Daliuta coal (DLT) all increase with MS addition. The 9–12% MS mass ratio is suitable during LRC fluidized-bed gasification to mitigate ash-related issues. The T s is closely related to the liquid-phase content or the transmissions of microparticles (e.g., atoms and ions) or blank spots during heating, while the ash fusion temperatures (AFTs) are mainly determined by acid/base ratios. The T s values of high-Fe XLT and XY mixed ashes increased gradually with increasing MS proportion because the sintering mechanisms transferred from liquid phase to solid phase, while for relatively high-Mg DLT ashes, the T s values increased with increasing MS proportions, which might result from the formations of high-melting-point minerals (e.g., Ca 3 (PO 4 ) 2 and Mg 2 SiO 4 ). The results deepen the understanding of ash sintering behaviors and provide references to alleviate ash-related issues during gasification.

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Analysis on H2 production process integrated CaO/Ca(OH)2 heat storage and sorption enhanced staged gasification using calcium looping

Zhang

Liguo

et al. 2022

Energy Conversion and Management

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Investigation on the sintering behaviors of low-temperature lignite ashes

Cited by 11 publications

References 28 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

Understanding Ash Sintering Variation Behaviors of Low-Rank Coals with Municipal Sludge Addition Based on Mineral Interactions

Analysis on H2 production process integrated CaO/Ca(OH)2 heat storage and sorption enhanced staged gasification using calcium looping

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