Effect of different reaction atmospheres on the sintering temperature of Jincheng coal ash under pressurized conditions

Jing, Nijie; Wang, Qinhui; Luo, Zhongyang; Cen, Kefa

doi:10.1016/j.fuel.2011.04.013

Cited by 41 publications

(18 citation statements)

References 18 publications

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“…Moreover, the fine SiO 2 , Al 2 O 3 , and CaO particles with high reactivity (less than 1 lm, and larger surface specific area) interact each other, and form low-melting-point, spherical gehlenite (Ca 2 Al 2 SiO 7 ) grains. These then agglomerate into amorphous matter, which lowers the melting point of the mixed oxides [53,54]. Such oxides may trigger problems in fluidization through their adhesion, sintering, and agglomeration into larger spheres, sintered grains, and agglomerates, which impede fluidization.…”

Section: Slag Formation Mechanismmentioning

confidence: 99%

Understanding mineral behaviors during anthracite fluidized-bed gasification based on slag characteristics

Huang

et al. 2014

Applied Energy

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Section: Slag Formation Mechanismmentioning

confidence: 99%

Understanding mineral behaviors during anthracite fluidized-bed gasification based on slag characteristics

Huang

et al. 2014

Applied Energy

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“…The main mechanism of the ash sintering process is the melting of the surface of individual ash particles. The ash particles with melted surface coalescent as a result of minimization of the surface tension [6,9,10]. The formation of ash deposits-slagging in the radiative region and fouling in the convection region of the combustion system can cause consequences such as deterioration of heat transfer, damage of boiler surfaces, and even shutdown of the boiler [11,12].…”

Section: Introductionmentioning

confidence: 99%

Application of the Mechanical and Pressure Drop Tests to Determine the Sintering Temperature of Coal and Biomass Ash

Król

Nowak-Woźny

2021

Energies

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The aim of this paper is to investigate the mechanical properties of coal and biomass ash during the sintering process. For this study, bituminous coal, lignite, wheat straw, barley straw, and rye straw were selected. The proximate, ultimate, and oxide analyses were performed. The ash from these fuels was prepared in a special way that ensured the physicochemical invariability of the initial state of the mineral matter of coal and biomass. The purpose of this selection was to obtain widely available and clearly diversified materials. Based on the results of ash composition and ultimate analysis the most common ash deposition, indices were determined. Certain conflict of index indications was observed. Then, the mechanical test and pressure drop test were performed. During the mechanical test, the fracture stress as a function of sintering temperature was measured. During the pressure drop test, the pressure before and behind the sample was measured as a function of sintering temperature. Both tests showed that the characteristic changes (the occurrence of a maximum on the pressure drop curve and the inflection point at the mechanical curve) dependencies were at nearly the same temperatures. These results were compared with the initial deformation temperature (IDT) from the standard Leitz method. A linear relationship between sintering temperatures determined by the mechanical test, pressure drop test, and IDT Leitz test was obtained. The obtained results are promising in terms of the application of the mechanical methods (fracture stress test and pressure drop test) as methods of the early stage prediction of slagging/fouling risks.

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“…Other low-melting point metasilicate minerals such as iron cordierite and hedenbergite could be formed by combining ferrous oxide with alkaline oxides containing Mg, Ca, etc. (Jing et al, 2011)…”

Section: Resultsmentioning

confidence: 99%

Characterization of ash melting behaviour at high temperatures under conditions simulating combustible solid waste gasification

et al. 2018

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To achieve high-temperature gasification-melting of combustible solid waste, ash melting behaviour under conditions simulating high-temperature gasification were studied. Raw ash (RA) and gasified ash (GA) were prepared respectively by waste ashing and fluidized bed gasification. Results of microstructure and composition of the two-ash indicated that GA showed a more porous structure and higher content of alkali and alkali earth metals among metallic elements. Higher temperature promoted GA melting and could reach a complete flowing state at about 1250°C. The order of melting rate of GA under different atmospheres was reducing condition > inert condition > oxidizing condition, which might be related to different existing forms of iron during melting and different flux content with atmosphere. Compared to RA, GA showed lower melting activity at the same condition due to the existence of an unconverted carbon and hollow structure. The melting temperature for sufficient melting and separation of GA should be at least 1250°C in this work.

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Effect of different reaction atmospheres on the sintering temperature of Jincheng coal ash under pressurized conditions

Cited by 41 publications

References 18 publications

Understanding mineral behaviors during anthracite fluidized-bed gasification based on slag characteristics

Understanding mineral behaviors during anthracite fluidized-bed gasification based on slag characteristics

Application of the Mechanical and Pressure Drop Tests to Determine the Sintering Temperature of Coal and Biomass Ash

Characterization of ash melting behaviour at high temperatures under conditions simulating combustible solid waste gasification

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