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Slagging Characteristics and Optimization of Operating Temperature on High-Alkali Coal Gasification

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Abstract

In order to mitigate the slagging risks of high-alkali coal (HAC) gasification while optimizing the operating temperatures for practical application, the experimental and calculational works were performed on the horizontal tubular furnace system and the FactSage 7.2 software, respectively. The slagging tendencies of three HACs were anticipated by applying different indexes of ash chemistry characteristics prior to experiments, but the determined results were found inconsistent. The relationship between Na retained ratio (RNa) and the ash fusion temperatures (AFTs) of gasification residues demonstrated that the AFTs of coal with high RNa are low, while AFTs of coal with low RNa are high. Nevertheless, when the residues contained a large number of calcium-containing silicates and aluminosilicates, the ATFs were reduced significantly even if its RNa stayed at a low level. Furthermore, the operating temperatures of the three coals (in order of Mulei coal, Shaerhu coal, and Tietou coal) were suggested to be controlled below 1150°C, 1100°C, and 950°C, respectively.

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Abbreviations

A :

ash ratio/%

AFTs:

ash fusion temperatures/°C

C :

gasification residue ratio/%

CFB:

circulating fluidized bed

EDX:

energy dispersive X-ray spectrometer

HAC:

high-alkali coal

OVcoal :

value of sodium in raw coal/mg·g−1

OVresidue :

value of sodium in gasification residues/mg·g−1

SEM:

scanning electron microscopy

R NA :

retention ratio of sodium/%

R B/A :

alkali/acid ratio

R F/C :

iron/calcium ratio

R S/A :

silica/alumina ratio

ST:

softening temperature/°C

XRD:

X-ray diffraction

XRF:

X-ray fluorescence

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Acknowledgment

This work was financially supported by Beijing Municipal Science and Technology Commission (No. Z181100005118006).

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Authors and Affiliations

  1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, 100190, China

    Yanqi Fan, Haixia Zhang, Zhiping Zhu & Qinggang Lyu

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Yanqi Fan, Zhiping Zhu & Qinggang Lyu

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  1. Yanqi Fan
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  2. Haixia Zhang
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Correspondence to Haixia Zhang.

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Fan, Y., Zhang, H., Zhu, Z. et al. Slagging Characteristics and Optimization of Operating Temperature on High-Alkali Coal Gasification. J. Therm. Sci. 30, 644–655 (2021). https://doi.org/10.1007/s11630-021-1410-y

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  • DOI: https://doi.org/10.1007/s11630-021-1410-y

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