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Reduction in nitrogen oxides emissions by MILD combustion of dried sludge

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  • Shim, Sung Hoon
  • Jeong, Sang Hyun
  • Lee, Sang-Sup

Abstract

Demands for the thermal treatment of sewage sludge are increasing due to the regulation of its ocean disposal and the desire to recover its potential energy. Because of the high nitrogen content in sewage sludge, one of the concerns about its combustion is a potential increase in NOx emissions. Although a number of studies have been conducted to reduce NOx emissions by combustion modifications, very few studies have addressed the combustion of dried sludge. In this study, a combustion technique called moderate or intense low oxygen dilution (MILD) was applied to the combustion of dried sludge with the goal of reducing NOx emissions. MILD combustion of dried sludge was tested using both our laboratory-scale vertical combustor with internal circulation and our horizontal cyclone combustor with external circulation. Tests were conducted to find suitable operating conditions and to demonstrate the stable MILD combustion of dried sludge. From these tests, fuel and air flow patterns were found to be an important factor in maintaining stable MILD combustion, and the horizontal cyclone combustor demonstrated excellent performance in the reduction of NOx emissions by the MILD combustion of dried sludge.

Suggested Citation

  • Shim, Sung Hoon & Jeong, Sang Hyun & Lee, Sang-Sup, 2014. "Reduction in nitrogen oxides emissions by MILD combustion of dried sludge," Renewable Energy, Elsevier, vol. 65(C), pages 29-35.
    • Handle: RePEc:eee:renene:v:65:y:2014:i:c:p:29-35
    DOI: 10.1016/j.renene.2013.07.005
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    References listed on IDEAS

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    1. Ehsan Houshfar & Terese Løvås & Øyvind Skreiberg, 2012. "Experimental Investigation on NO x Reduction by Primary Measures in Biomass Combustion: Straw, Peat, Sewage Sludge, Forest Residues and Wood Pellets," Energies, MDPI, vol. 5(2), pages 1-21, February.
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    Cited by:

    1. Xiang Gou & Zifang Wang & Yurou Liu & Meng Si & Surjit Singh & Enyu Wang & Liansheng Liu & Jinxiang Wu, 2015. "Numerical Simulation Research on the Process of Reburning South American Coal and Cornstalk," Energies, MDPI, vol. 8(9), pages 1-18, September.
    2. Wang, Xuebin & Zhang, Jiaye & Xu, Xinwei & Mikulčić, Hrvoje & Li, Yan & Zhou, Yuegui & Tan, Houzhang, 2020. "Numerical study of biomass Co-firing under Oxy-MILD mode," Renewable Energy, Elsevier, vol. 146(C), pages 2566-2576.
    3. Tian, Ye & Zhou, Xiong & Ji, Xuanyu & Bai, Jisong & Yuan, Liang, 2019. "Applying moderate or intense low-oxygen dilution combustion to a co-axial-jet I-shaped recuperative radiant tube for further performance enhancement," Energy, Elsevier, vol. 171(C), pages 149-160.
    4. Hu, Fan & Li, Pengfei & Zhang, Tai & Zu, Daohua & Cheng, Pengfei & Liu, Yaowei & Mi, Jianchun & Liu, Zhaohui, 2022. "Experimental investigation on co-firing residual char and pulverized coal under MILD combustion using low-temperature preheating air," Energy, Elsevier, vol. 244(PA).

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