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The production of hydrogen-rich gas by wet sludge pyrolysis using waste heat from blast-furnace slag

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  • Luo, Siyi
  • Feng, Yu

Abstract

Blast furnace (BF) slag, a byproduct of steelmaking industry, contains a large amount of sensible heat and is composed of some metal oxides, which exhibits preferable catalytic performance in improving tar cracking and CnHm reforming. This paper presents a heat recovery system from the heat of BF slag, which generates hydrogen-rich gas via the endothermic reactions of sludge pyrolysis. The effects of various parameters including the slag temperature, the mass ratio of slag to sludge (B/S), particle size and feed moisture on product yields and gas characteristics were evaluated separately. It was found that the pyrolysis products distribution was significantly influenced by the BF slag temperature. The differences resulting from varying B/S practically disappear as higher temperature heat carrier is approached. The optimum feed moisture was in favour of sludge pyrolysis by getting char and tar participate in gasification reactions, improving gas yield and quality. BF slag as catalyst can greatly increase H2 and CO contents of gas by improving tar degradation and reforming of biogas (CO2 and CH4). Decreasing the slag particles size was helpful to sludge primary pyrolysis to produce more light gases, less char and condensate, while its effects on gas compositions was not evident.

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  • Luo, Siyi & Feng, Yu, 2016. "The production of hydrogen-rich gas by wet sludge pyrolysis using waste heat from blast-furnace slag," Energy, Elsevier, vol. 113(C), pages 845-851.
    • Handle: RePEc:eee:energy:v:113:y:2016:i:c:p:845-851
    DOI: 10.1016/j.energy.2016.07.130
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    References listed on IDEAS

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    1. He, Chao & Chen, Chia-Lung & Giannis, Apostolos & Yang, Yanhui & Wang, Jing-Yuan, 2014. "Hydrothermal gasification of sewage sludge and model compounds for renewable hydrogen production: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 39(C), pages 1127-1142.
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    Cited by:

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    2. Zhang, Huining & Dong, Jianping & Wei, Chao & Cao, Caifang & Zhang, Zuotai, 2022. "Future trend of terminal energy conservation in steelmaking plant: Integration of molten slag heat recovery-combustible gas preparation from waste plastics and CO2 emission reduction," Energy, Elsevier, vol. 239(PE).
    3. Duan, Wenjun & Yu, Qingbo & Wang, Zhimei & Liu, Junxiang & Qin, Qin, 2018. "Life cycle and economic assessment of multi-stage blast furnace slag waste heat recovery system," Energy, Elsevier, vol. 142(C), pages 486-495.
    4. Zuo, Zongliang & Feng, Yan & Li, Xiaoteng & Luo, Siyi & Ma, Jinshuang & Sun, Huiping & Bi, Xuejun & Yu, Qingbo & Zhou, Enze & Zhang, Jingkui & Guo, Jianxiang & Lin, Huan, 2021. "Thermal-chemical conversion of sewage sludge based on waste heat cascade recovery of copper slag: Mass and energy analysis," Energy, Elsevier, vol. 235(C).
    5. Sun, Yongqi & Seetharaman, Seshadri & Zhang, Zuotai, 2018. "Integrating biomass pyrolysis with waste heat recovery from hot slags via extending the C-loops: Product yields and roles of slags," Energy, Elsevier, vol. 149(C), pages 792-803.
    6. Xie, Huaqing & Li, Rongquan & Yu, Zhenyu & Wang, Zhengyu & Yu, Qingbo & Qin, Qin, 2020. "Combined steam/dry reforming of bio-oil for H2/CO syngas production with blast furnace slag as heat carrier," Energy, Elsevier, vol. 200(C).
    7. Tang, Siqi & Zheng, Chunmiao & Yan, Feng & Shao, Ningning & Tang, Yuanyuan & Zhang, Zuotai, 2018. "Product characteristics and kinetics of sewage sludge pyrolysis driven by alkaline earth metals," Energy, Elsevier, vol. 153(C), pages 921-932.

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