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The synergistic effect during co-combustion of municipal sludge and coal: Experimental and ReaxFF molecular dynamic study

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  • Xu, Tong
  • Wang, Chunbo
  • Hong, Dikun
  • Li, Song
  • Yue, Shuang

Abstract

In this work, the behaviors of municipal sludge/coal co-combustion were investigated by experiments and ReaxFF molecular dynamic simulations. The molecular models of coal and sludge were constructed based on experimental characterization. The characteristics of the separately combustion of sludge and coal from ReaxFF MD simulations were consistent with that from thermostatic thermogravimetric experiments. The synergistic effect on the co-combustion characteristics were investigated via performing sludge/coal co-combustion simulations under various conditions. The results showed that the sludge/coal co-combustion has positive synergistic effects on the co-combustion characteristics such as combustion rate, consumption of O2, and yield of CO2. By using the atomic labeling method, it was found that the combustion of sludge was inhibited while the combustion of coal was promoted during co-combustion process. The carbonaceous gas was found to be an important intermediate product in the generation of CO2. The synergistic effect promoted coal combustion because some ·OH radicals produced by the sludge attacked the aromatic ring structure in coal, which accelerated the formation of carbonaceous gas during sludge/coal co-combustion. This work provided new insight into the behaviors of municipal sludge/coal co-combustion.

Suggested Citation

  • Xu, Tong & Wang, Chunbo & Hong, Dikun & Li, Song & Yue, Shuang, 2023. "The synergistic effect during co-combustion of municipal sludge and coal: Experimental and ReaxFF molecular dynamic study," Energy, Elsevier, vol. 262(PB).
  • Handle: RePEc:eee:energy:v:262:y:2023:i:pb:s0360544222024392
    DOI: 10.1016/j.energy.2022.125553
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    Cited by:

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    5. Su, Kun & Ouyang, Ziqu & Wang, Hongshuai & Ding, Hongliang & Zhang, Jinyang & Wang, Wenyu, 2024. "Effects of activated fuel and staged secondary air distributions on purification, combustion and NOx emission characteristics of pulverized coal with purification-combustion technology," Energy, Elsevier, vol. 302(C).
    6. Liu, Jiaxun & Yang, Xiuchao & Liu, Jianguo & Jiang, Xiumin, 2024. "Microscopic pyrolysis mechanisms of superfine pulverized coal based on TG-FTIR-MS and ReaxFF MD study," Energy, Elsevier, vol. 289(C).
    7. Su, Kun & Ouyang, Ziqu & Wang, Hongshuai & Zhang, Jinyang & Ding, Hongliang & Wang, Wenyu, 2024. "Experimental study on municipal sludge/coal co-combustion preheated by self-preheating burner: Self-preheating two-stage combustion and NOx emission characteristics," Energy, Elsevier, vol. 290(C).
    8. Wang, Zhi & Li, Jian & Yan, Beibei & Zhou, Shengquan & Zhu, Xiaochao & Cheng, Zhanjun & Chen, Guanyi, 2024. "Thermochemical processing of digestate derived from anaerobic digestion of lignocellulosic biomass: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 199(C).

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