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Effects of Jincheng coal fine char from fluidized-bed gasifier on ash fusion and CO2 gasification behaviors of biomass

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Abstract

The combined study of ash fusion temperature (AFT) adjustment and gasification reactivity change provides a valuable reference for biomass utilization. The effects of Jincheng coal fine char (JF) on the AFT and CO2 gasification reactivity of biomass [peanut hull (PH) and cotton stalk (CS)] were investigated by ash fusion tester and thermogravimetry analyzer, respectively. Furthermore, the AFT change mechanism was explored by X-ray diffraction analysis, and the influences of JF mass ratio and temperature on gasification reactivity were studied. As JF mass ratio varied from 5 to 25%, the JF addition could increase the AFTs of PH and CS effectively; however, the change trends were different due to their different ash yields and ash compositions. The AFT increase was ascribed to the conversions of low melting point (MP) K-containing minerals into high MP kalsilite (KAlSiO4) and leucite (KAlSi2O6). JF exerted adverse effects on the gasification reactivity of PH and CS, and the effects strengthened at high JF ratio and low temperature. JF had less effect on the gasification reactivity of CS because its ash yield and K2O content were higher than those of PH. Inhibition effect did not exist during the gasification process of CS/JF mixture with relatively low JF ratio at 950 °C and 1000 °C, because the destructive effect of high-content K2O on the order degree of JF carbon structure prevailed over the CO2 and heat hindrances of JF on CS char particles at high temperature.

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Abbreviations

AFT:

Ash fusion temperature (°C)

JF:

Jincheng coal fine char

PH:

Peanut hull

CS:

Cotton stalk

XRD:

X-ray diffraction

MP:

Melting point

K:

Potassium

FB:

Fluidized-bed

AAEM:

Alkali and alkali earth metal

HTA:

High-temperature ash

DT:

Deformation temperature (°C)

ST:

Softening temperature (°C)

HT:

Hemispherical temperature (°C)

FT:

Fluid temperature (°C)

x exp−t curve:

Curve of experimental conversion versus time

x cal−t curve:

Curve of calculated conversion versus time

x exp :

Experimental carbon conversion

m 0 :

Char mass at the beginning of gasification reaction (mass/%)

m t :

Char mass at a certain moment of gasification reaction (mass/%)

m + ∞ :

Char mass at the end of gasification reaction (mass/%)

x cal :

Calculated carbon conversion

m bio,0 :

Initial mass of biomass char (mass/%)

m bio,t :

Instantaneous mass of biomass char (mass/%)

m bio,+∞ :

Final mass of biomass char (mass/%)

m JF,0 :

Initial mass of Jincheng coal fine char (mass/%)

m JF,t :

Instantaneous mass of Jincheng coal fine char (mass/%)

m JF,+∞ :

Final mass of Jincheng coal fine char (mass/%)

w bio :

Mass fraction of biomass char (mass/%)

w JF :

Mass fraction of Jincheng coal fine char (mass/%)

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Acknowledgements

This work was carried out with financial support by the National Natural Science Foundation of China (21875059) and the Natural Science Foundations of Shandong Province, China (ZR2021MB011).

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  1. School of Chemistry and Chemical Engineering, Heze University, 2269 Daxue Road, Heze, 274000, Shandong, People’s Republic of China

    Hongli Fan, Fenghai Li, Meiling Xu, Mingxi Guo, Qianqian Guo & Guopeng Han

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Fan, H., Li, F., Xu, M. et al. Effects of Jincheng coal fine char from fluidized-bed gasifier on ash fusion and CO2 gasification behaviors of biomass. J Therm Anal Calorim 148, 5847–5858 (2023). https://doi.org/10.1007/s10973-023-12078-4

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