Evaluation of slagging and fouling characteristics during Zhundong coal co-firing with a Si/Al dominated low rank coal

Zhu, Chuan; Hua, Tu; Yang, Bai; Ma, Dong; Zhao, Yonggang

doi:10.1016/j.fuel.2019.115730

Cited by 70 publications

(30 citation statements)

References 30 publications

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“…Similar conclusions are reached by Guo et al 6 and Wu et al 9 With the continuous deposition of ash on #1 and #2, the inlet FGT and T M increase gradually, and the condensation deposition of Na/Ca sulfate in the flue gas attenuates 16,41–43 . Subsequently, although the melting point of CaSO 4 exceeds 1400°C, it is hard to avoid decomposing to SO 3 and CaO around 1000°C due to the presence of CO in flue gas 16,34,35 . And it is likely to react with other minerals (such as gehlenite) to form low‐temperature eutectics 37–39,44 .…”

Section: Resultssupporting

confidence: 75%

“…Gehlenite is the main mineral leading to ash deposition in Zhundong coal ash 14 . Although its melting point is higher than 1500°C, it is likely to form amorphous eutectic with other compounds 35 . CaSO 4 also plays an important role in ash deposition.…”

Section: Resultsmentioning

confidence: 99%

“…14 Although its melting point is higher than 1500 C, it is likely to form amorphous eutectic with other compounds. 35 plays an important role in ash deposition. The detailed deposition mechanism of ash is analyzed by the microscopic test and simulation calculation.…”

Section: Morphology and Mineral Composition Of Deposited Ashmentioning

confidence: 99%

“…Many scholars attribute severe ash deposition to high content of alkali metals and alkaline earth metals (AAEMs) in Zhundong coal ash. Up to now, in Wucaiwan region, one of the highest yield mines in Zhundong, there are nearly 20 units fueled by calciumrich Wucaiwan coal, including Tianchi energy coal, Yihua coal, and Shenhua coal, which usually contain Ca (27)(28)(29)(30)(31)(32)(33)(34)(35) wt %) and Na (3.5-8.2 wt %) in ash. 4 The sublimation and condensation of Ca/Na compounds and their effects on ash deposition under 750-1200 C have been widely studied.…”

Section: Introductionmentioning

confidence: 99%

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Ash deposition and heat transfer characteristics on the convective heating surface of calcium‐rich Zhundong coal combustion in a 0.4‐MW_th facility

Jin

Yang

et al. 2022

Asia-Pacific J Chem Eng

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Thermal power plants in Zhundong area of Xinjiang equip Π-typed boiler widely in recent years. With the increasing ratio of Zhundong coal in blended fuels, the slagging is strengthened. And the boiler shutdown was caused by ash deposition on the convective heating surface frequently. In order to study the mechanism of this problem, a 0.4-MW th pilot-scale facility was built and expected to study ash deposition and heat transfer characteristics on the convective heating surface of 100% burning calcium-rich Zhundong coal.Thermodynamic model calculation was implemented on the heat transfer characteristics of two groups of tube panels, on which ash samples were collected after experiments. Then, simulation calculation was applied by software for verification. The ash samples were characterized by X-ray diffraction spectroscopy (XRD) and scanning electron microscopy (SEM) coupled with energy dispersive X-ray detector (EDX). FactSage 7.3 thermochemical software package and a high-temperature viscometer were also used to figure out the viscosity-temperature characteristics. Results showed that a "step change" of heat transfer characteristics occurred when the flue gas temperature of inlet tube panel #2 approached to 1000 C. After the "step change," the heat transfer characteristics became stable. The ash deposition mainly consisted of siliconcalcium compounds of tube panel #1, while in contrast, that of tube panel #2 consisted of gehlenite, CaSO 4 , and Na 2 SO 4 . The ratio of liquid phase in raw coal ash samples increased sharply when the flue gas temperature exceeded 1030 C. With the increase of surface temperature of fouling tube panel, the CaSO 4 would be decomposed to release CaO, which reacted with gehlenite or other compounds to form low temperature eutectics. The fouling of ash would transfer to slagging and lead to the deterioration of ash deposition, which induced the formation of "step change" during the experiment.

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Section: Resultssupporting

confidence: 75%

Section: Resultsmentioning

confidence: 99%

Section: Morphology and Mineral Composition Of Deposited Ashmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Ash deposition and heat transfer characteristics on the convective heating surface of calcium‐rich Zhundong coal combustion in a 0.4‐MW_th facility

Jin

Yang

et al. 2022

Asia-Pacific J Chem Eng

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“…The perovskite structure of Ba 0.8 Sr 0.2 TiO 3 phase was indicated by other diffraction peaks corresponding to (100), ( 110), (111), (020), (120), (211), and (202). 34 No obvious impurity phases were detected. These results confirm the presence of the ferroelectric phase (BST) and ferromagnetic phase (NZFO) in the composite ceramics, each retaining its respective characteristics.…”

Section: Crystal Structurementioning

confidence: 97%

Effect of Al2O3 Addition on Magnetoelectric Properties of Ni0.5Zn0.5Fe2O4/Ba0.8Sr0.2TiO3 Composite Ceramics

Qin

Zhou

et al. 2021

Journal of Elec Materi

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Magnetoelectric composites have attracted widespread attention during the past few decades due to their strong magnetoelectric coupling effect and potential applications above room temperature. Ni 0.5 Zn 0.5 Fe 2 O 4 /Ba 0.8 Sr 0.2-TiO 3 composites have been prepared by the conventional high-temperature solid-state method and the effects of Al 2 O 3 addition on their microstructure, dielectric, ferroelectric, and magnetic properties studied. x-Ray diffraction (XRD) analysis confirmed the biphase structure of the composites. scanning electron microscopy (SEM) showed that addition of a certain amount of Al 2 O 3 can enhance the density and promote uniform growth of particle size. The sample with 1 wt.% Al 2 O 3 addition exhibited the largest dielectric constant and lowest dielectric loss (< 0.05 at 1 kHz) at high temperature (> 354°C). The sample with 3 wt.% Al 2 O 3 addition presented the best ferroelectric properties, with the highest values of residual polarization (P r = 2.2150 lC/ cm 2 ) and coercive field (E c = 30.6527 kV/cm) among the specimens. The remanent magnetization (M r ) and saturated magnetization (M s ) decreased with increasing Al 2 O 3 content. In short, addition of Al 2 O 3 caused changes in the grain size, density, and defects, and addition of a certain amount of Al 2 O 3 can improve the magnetoelectric properties.

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Assessment of Slagging and Fouling Indicators for Ashes from Vine Shoots Regent Cultivar

Maj,

Klimek,

Kapłan

2024

Lecture Notes in Civil Engineering

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Evaluation of slagging and fouling characteristics during Zhundong coal co-firing with a Si/Al dominated low rank coal

Cited by 70 publications

References 30 publications

Ash deposition and heat transfer characteristics on the convective heating surface of calcium‐rich Zhundong coal combustion in a 0.4‐MW_th facility

Ash deposition and heat transfer characteristics on the convective heating surface of calcium‐rich Zhundong coal combustion in a 0.4‐MW_th facility

Effect of Al2O3 Addition on Magnetoelectric Properties of Ni0.5Zn0.5Fe2O4/Ba0.8Sr0.2TiO3 Composite Ceramics

Assessment of Slagging and Fouling Indicators for Ashes from Vine Shoots Regent Cultivar

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Evaluation of slagging and fouling characteristics during Zhundong coal co-firing with a Si/Al dominated low rank coal

Cited by 70 publications

References 30 publications

Ash deposition and heat transfer characteristics on the convective heating surface of calcium‐rich Zhundong coal combustion in a 0.4‐MWth facility

Ash deposition and heat transfer characteristics on the convective heating surface of calcium‐rich Zhundong coal combustion in a 0.4‐MWth facility

Effect of Al2O3 Addition on Magnetoelectric Properties of Ni0.5Zn0.5Fe2O4/Ba0.8Sr0.2TiO3 Composite Ceramics

Assessment of Slagging and Fouling Indicators for Ashes from Vine Shoots Regent Cultivar

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Ash deposition and heat transfer characteristics on the convective heating surface of calcium‐rich Zhundong coal combustion in a 0.4‐MW_th facility

Ash deposition and heat transfer characteristics on the convective heating surface of calcium‐rich Zhundong coal combustion in a 0.4‐MW_th facility