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Co-combustion characteristics of sewage sludge with different rank bituminous coals under the O2/CO2 atmosphere

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Abstract

The effects of sewage sludge (SS) blended ratio, O2/CO2 ratio, and type of bituminous coal on the co-combustion characteristics of SS with bituminous coals were investigated. Thermogravimetric analysis was used to analyze the co-combustion profiles. Results show that TG curve shifts to a lower temperature with increasing SS blended ratio and O2/CO2 ratio. A distinct transition section exists at fixed carbon combustion of the blended fuels stage, and the temperature range of this transition section decreases significantly with increasing O2/CO2 ratio. The combustion property indexes of blended fuel increase with increasing SS blended ratio and O2/CO2 ratio. However, effect of O2/CO2 ratio on increasing the overall co-combustion characteristics becomes smaller when the oxygen concentration exceeds 30 %. Comparing SS blended with Huaibei (HB) bituminous coal, the SS blended with Shenhua (SH) bituminous coal (high-rank bituminous coal) combustion has the good combustion performance.

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Abbreviations

T a :

Ignition temperature (K)

T b :

Burnout temperature (K)

T max :

Temperature corresponding to the maximum mass loss rate (K)

(dw/dt)max :

Maximum mass loss rate (% min−1)

(dw/dt)mean :

Mean mass loss rate (% min−1)

C b :

Ignitability property index (% K−2 min−1)

G :

Steady combustion property index (% K−2 min−1)

S :

Comprehensive property index (%2 K−3 min−2)

t b :

Burnout time (min)

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Acknowledgements

The financial support from the Nature Science Research Project of Anhui province (Grant No. 1508085ME73), the National Natural Science Foundation of China (Grant No. 31200542), and Open Foundation of Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education are greatly acknowledged.

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Authors and Affiliations

  1. School of Energy and Environment, Anhui University of Technology, Ma’anshan, 243002, China

    Yousong Zhang, Lihui Zhang, Feng Duan & **aoru Sun

  2. School of Energy and Mechanical Engineering, Nan**g Normal University, Nan**g, 210042, China

    **aoxiang Jiang

  3. Department of Chemical Engineering, Chung Yuan Christian University, Taiwan, 32023, China

    ChienSong Chyang

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  1. Yousong Zhang
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  2. Lihui Zhang
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  3. Feng Duan
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  4. **aoxiang Jiang
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  5. **aoru Sun
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Correspondence to Feng Duan or ChienSong Chyang.

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Zhang, Y., Zhang, L., Duan, F. et al. Co-combustion characteristics of sewage sludge with different rank bituminous coals under the O2/CO2 atmosphere. J Therm Anal Calorim 121, 729–736 (2015). https://doi.org/10.1007/s10973-015-4582-4

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  • DOI: https://doi.org/10.1007/s10973-015-4582-4

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