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Morphology of char particles from coal pyrolysis in a pressurized entrained flow reactor: Effects of pressure and atmosphere

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  • Zhang, Jiaye
  • Chen, Chongming
  • Zhou, Ao
  • Rahman, Zia ur
  • Wang, Xuebin
  • Stojiljković, Dragoslava
  • Manić, Nebojsa
  • Vujanović, Milan
  • Tan, Houzhang

Abstract

A pressurized drop tube furnace was used to study the pyrolysis behavior of bituminous and lignite coal at elevated pressure. Experiments were conducted at the pressure range from 1 to 10 atm in 100% N2 or 100% CO2 atmosphere. The volatile yields, char morphology, swelling ratio, and pore structure were discussed in detail. The results show that the pressure, atmosphere and coal rank could effect on the volatile releasing and char evolution significantly. In N2 atmosphere, the total volatile yields of YL and NM coal decrease as the pressure elevated, while in CO2 atmosphere, the mass release of NM coal increases at high pressure contributed by the reaction of CO2 with organic macromolecule inside the particles; different with bituminous coal, no significant swelling behavior is found with the increase of pressure; the BET surface area of YL char decreases as the pressure increases, while for lignite coal, in N2 atmosphere and at high pressure, less macro pores are formed, which could contribute to the BET surface area. While in CO2 atmosphere, the CO2-macromocular organic reaction would promote the volatile releasing, and the BET surface area decreases significantly at high pressure.

Suggested Citation

  • Zhang, Jiaye & Chen, Chongming & Zhou, Ao & Rahman, Zia ur & Wang, Xuebin & Stojiljković, Dragoslava & Manić, Nebojsa & Vujanović, Milan & Tan, Houzhang, 2022. "Morphology of char particles from coal pyrolysis in a pressurized entrained flow reactor: Effects of pressure and atmosphere," Energy, Elsevier, vol. 238(PB).
    • Handle: RePEc:eee:energy:v:238:y:2022:i:pb:s0360544221020946
    DOI: 10.1016/j.energy.2021.121846
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    References listed on IDEAS

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    2. Ma, Cheng & Zhao, Yuzhen & Lang, Tingting & Zou, Chong & Zhao, Junxue & Miao, Zongcheng, 2023. "Pyrolysis characteristics of low-rank coal in a low-nitrogen pyrolysis atmosphere and properties of the prepared chars," Energy, Elsevier, vol. 277(C).
    3. Zhang, Xiaoyu & Zhu, Shujun & Zhu, Jianguo & Liu, Yuhua & Zhang, Jiahang & Hui, Jicheng & Ding, Hongliang & Cao, Xiaoyang & Lyu, Qinggang, 2023. "Preheating and combustion characteristics of anthracite under O2/N2, O2/CO2 and O2/CO2/H2O atmospheres," Energy, Elsevier, vol. 274(C).
    4. Huang, Xiaohong & Hu, Fan & Liu, Xuhui & Liu, Zhaohui, 2022. "Structure and reactivity of chars prepared from low-volatile coal under O2/N2 and O2/CO2 conditions in a flat-flame assisted entrained flow reactor," Energy, Elsevier, vol. 261(PB).
    5. Li, Yukai & Sun, Shaozeng & Feng, Dongdong & Zhang, Wenda & Zhao, Yijun & Qin, Yukun, 2023. "Syngas tempered pulverized coal reburning: Effect of different reaction gas components," Energy, Elsevier, vol. 271(C).
    6. Rahman, Zia ur & Wang, Xuebin & Zhang, Jiaye & Yang, Zhiwei & Dai, Gaofeng & Verma, Piyush & Mikulcic, Hrvoje & Vujanovic, Milan & Tan, Houzhang & Axelbaum, Richard L., 2022. "Nitrogen evolution, NOX formation and reduction in pressurized oxy coal combustion," Renewable and Sustainable Energy Reviews, Elsevier, vol. 157(C).

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