Effects of silicon-aluminum additives on ash mineralogy, morphology, and transformation of sodium, calcium, and iron during oxy-fuel combustion of zhundong high-alkali coal

Wang, Chang‐An; Lei, Zixuan; Sun, Ruijin; Hu, Yueyi; Tang, Guantao; Chen, Wufeng; Du, Yongbo; Che, Defu

doi:10.1016/j.ijggc.2019.102832

Cited by 29 publications

(12 citation statements)

References 47 publications

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“…The AFTs of co-combustion FIGURE 8 Ash oxide contents of the blends of ZD coal and RHC at different temperatures ash show a "V" distribution with increasing SiO 2 content [22,23]. It is easily understood that extra SiO 2 could react with Al 2 O 3 and provide a solidification effect to improve the AFTs [24].…”

Section: Chemical Compositions Of the Ash From The Blends Of Zd Coal ...mentioning

confidence: 99%

Co‐combustion and ash characteristics of Zhundong coal with rice husk hydrochar prepared by the hydrothermal carbonization technology for co‐combustion

Wang

Zhu

et al. 2021

IET Renewable Power Gen

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The high content of the AAEMs in Zhundong (ZD) coal causes easily slagging on the heating surface of boilers, and the addition of rice husk hydrochar (RHC) is expected to alleviate slagging by introducing SiO2 content. ZD coal is co‐fired with RHC according to different blend ratios, co‐combustion ashes are prepared subsequently at different temperatures. The co‐combustion characteristics of blends are studied firstly by using TGA, considering the combustion process can bring impacts on ash characteristics. Then the effects of the blend ratio and ashing temperature on the ash characteristics are discussed. The ash samples are characterized by XRF, ICP‐AES, XRD and SEM. The results show that an increase in the blend ratio of the RHC reduces the ignition temperature and lengthens the burnout time, which transforms the ash characteristics. The contents of quartz, gehlenite and andalusite greatly increase. The number of fine particles in the ash decreases, while the particle size increases. The ash fusion temperatures (AFTs) are at the lowest value at 8:2 and exceed totally that of ZD coal at 7:3. Considering to increase the AFTs of ZD coal, at least the blend ratio of 7:3 of ZD coal and RHC is recommended for co‐combustion.

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Section: Chemical Compositions Of the Ash From The Blends Of Zd Coal ...mentioning

confidence: 99%

Co‐combustion and ash characteristics of Zhundong coal with rice husk hydrochar prepared by the hydrothermal carbonization technology for co‐combustion

Wang

Zhu

et al. 2021

IET Renewable Power Gen

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“…Additives were widely used to decrease agglomeration and sintering levels, but each has its own problem [10][11][12][13]. Their cost is usually high and their application depends on the feedstock [10,14].…”

Section: Introductionmentioning

confidence: 99%

Will mixing rule or chemical reactions dominate the ash behavior of biomass mixtures in combustion processes on laboratory and pilot scales?

Atallah

Defoort²,

Campargue³

et al. 2022

Fuel

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“…Hence, coal compositions are inconsistent, which produces ash particles with different chemical compositions. [18][19][20] The chemical composition of ash affects the adsorption of SO 3 , which might change the optimal temperature of flue gas during operation. Therefore, the temperature selection should consider the influence of the chemical composition of ash particles.…”

Section: Introductionmentioning

confidence: 99%

Effect of ash composition on adsorption and agglomeration characteristics in low‐low‐temperature electrostatic precipitator systems

et al. 2021

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The low‐low temperature electrostatic precipitator (LLT‐ESP) has been applied in many power plants to improve the emission performance. In this study, a number of fix‐bed experiments were conducted, which simulated the operation condition of LLT‐ESP. The effect of chemical composition on the adsorption characteristics of ash samples and the agglomeration after adsorption were studied. The results show that the agglomeration of ash particles occurs in three forms, including agglomeration among small particles, adhesion of loose pellets to large particles, and agglomeration among large particles. The capacity of ash particles to adsorb sulphuric acid is less affected by the increase of added amounts of NaCl or KCl. At the same time, the added amount of NaCl or KCl also has little effect on the agglomeration degree of ash particles. The addition of MgO, CaO, Fe2O3, Na2CO3, or K2CO3 from 0% to 13.3%, 22.4%, 23.9%, 18.4%, or 14.2%, promotes the adsorption of sulphuric acid by ash particles from 1.95 mg g−1 to 7.33, 7.71, 6.72, 5.1, or 5.44 mg g−1 (based on sulphur content), respectively, thereby promoting the agglomeration between ash particles. As the addition amount increases, the agglomeration phenomenon among particles becomes more conspicuous. The form of agglomeration changes from agglomeration among small particles to agglomeration among large particles. In addition, the addition of MgO or CaO has great influence on the adsorption and agglomeration.

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Effects of silicon-aluminum additives on ash mineralogy, morphology, and transformation of sodium, calcium, and iron during oxy-fuel combustion of zhundong high-alkali coal

Cited by 29 publications

References 47 publications

Co‐combustion and ash characteristics of Zhundong coal with rice husk hydrochar prepared by the hydrothermal carbonization technology for co‐combustion

Co‐combustion and ash characteristics of Zhundong coal with rice husk hydrochar prepared by the hydrothermal carbonization technology for co‐combustion

Will mixing rule or chemical reactions dominate the ash behavior of biomass mixtures in combustion processes on laboratory and pilot scales?

Effect of ash composition on adsorption and agglomeration characteristics in low‐low‐temperature electrostatic precipitator systems

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