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Characteristics of tar, NOx precursors and their absorption performance with different scrubbing solvents during the pyrolysis of sewage sludge

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  • Chen, Hongfang
  • Namioka, Tomoaki
  • Yoshikawa, Kunio

Abstract

Recently thermal utilizations of sewage sludge, especially pyrolysis and gasification, are regarded as promising technologies due to efficient utilization of fuel gas. In this study, characteristics of tar and NOx precursors were investigated during the pyrolysis of sewage sludge. Moreover, absorption performance for tar and NOx precursors were also studied by using four kinds of scrubbing mediums: cooking oil, diesel oil, BDF and water. The results showed that nitrogenous light PAHs were the major components of nitrogenous tar produced from the pyrolysis of sewage sludge. As for gravimetric tar and major nitrogenous tar compounds removal, cooking oil was the most suitable absorbent. With respect to NOx precursors, it was concluded that HCN, sharing of about 39.5% of total nitrogen of the sewage sludge, was the main NOx precursor gas whereas NH3 content could be neglected. Absorption capacity of hydrophobic scrubbing mediums against NOx precursor gases could be arranged as followed: diesel oil>cooking oil>BDF.

Suggested Citation

  • Chen, Hongfang & Namioka, Tomoaki & Yoshikawa, Kunio, 2011. "Characteristics of tar, NOx precursors and their absorption performance with different scrubbing solvents during the pyrolysis of sewage sludge," Applied Energy, Elsevier, vol. 88(12), pages 5032-5041.
    • Handle: RePEc:eee:appene:v:88:y:2011:i:12:p:5032-5041
    DOI: 10.1016/j.apenergy.2011.07.007
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    6. Chen, Hui & Chen, Dezhen & Hong, Liu, 2015. "Influences of activation agent impregnated sewage sludge pyrolysis on emission characteristics of volatile combustion and De-NOx performance of activated char," Applied Energy, Elsevier, vol. 156(C), pages 767-775.
    7. Zheng, Anqing & Li, Luwei & Tippayawong, Nakorn & Huang, Zhen & Zhao, Kun & Wei, Guoqiang & Zhao, Zengli & Li, Haibin, 2020. "Reducing emission of NOx and SOx precursors while enhancing char production from pyrolysis of sewage sludge by torrefaction pretreatment," Energy, Elsevier, vol. 192(C).
    8. Li, Chenlin & Aston, John E. & Lacey, Jeffrey A. & Thompson, Vicki S. & Thompson, David N., 2016. "Impact of feedstock quality and variation on biochemical and thermochemical conversion," Renewable and Sustainable Energy Reviews, Elsevier, vol. 65(C), pages 525-536.
    9. Jianqiang Zhou & Pan Gao & Changqing Dong & Yongping Yang, 2018. "Effect of Temperature and Mineral Matter on the Formation of NOx Precursors during Fast Pyrolysis of 2,5-Diketopiperazine," Energies, MDPI, vol. 11(3), pages 1-10, March.
    10. Sever Akdağ, Ayşe & Atak, Onur & Atimtay, Aysel T. & Sanin, Faika Dilek, 2018. "Co-combustion of sewage sludge from different treatment processes and a lignite coal in a laboratory scale combustor," Energy, Elsevier, vol. 158(C), pages 417-426.
    11. Shen, Yafei & Wang, Junfeng & Ge, Xinlei & Chen, Mindong, 2016. "By-products recycling for syngas cleanup in biomass pyrolysis – An overview," Renewable and Sustainable Energy Reviews, Elsevier, vol. 59(C), pages 1246-1268.
    12. Luo, Lei & Zhang, Hai & Jiao, Anyao & Jiang, Yuanzhen & Liu, Jiaxun & Jiang, Xiumin & Tian, Feng, 2019. "Study on the formation and dissipation mechanism of gas phase products during rapid pyrolysis of superfine pulverized coal in entrained flow reactor," Energy, Elsevier, vol. 173(C), pages 985-994.
    13. Hongfang Chen & Yin Wang & Guangwen Xu & Kunio Yoshikawa, 2012. "Fuel-N Evolution during the Pyrolysis of Industrial Biomass Wastes with High Nitrogen Content," Energies, MDPI, vol. 5(12), pages 1-21, December.
    14. Fang, Neng & Li, Zhengqi & Xie, Cheng & Liu, Shuxuan & Lu, Yue & Zeng, Lingyan & Chen, Zhichao, 2021. "Influence of the multi-burner bias angle on the air/particle flow characteristics in an improved fly ash entrained-flow gasifier," Energy, Elsevier, vol. 234(C).
    15. Fang, Neng & Li, Zhengqi & Xie, Cheng & Liu, Shuxuan & Zeng, Lingyan & Chen, Zhichao & Zhang, Bin, 2020. "The application of fly ash gasification for purifying the raw syngas in an industrial-scale entrained flow gasifier," Energy, Elsevier, vol. 195(C).
    16. Fang, Shiwen & Deng, Zhengbing & Lin, Yan & Huang, Zhen & Ding, Lixing & Deng, Lisheng & Huang, Hongyu, 2021. "Nitrogen migration in sewage sludge chemical looping gasification using copper slag modified by NiO as an oxygen carrier," Energy, Elsevier, vol. 228(C).

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