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Co-Combustion of Low-Rank Coal with Woody Biomass and Miscanthus: An Experimental Study

Author

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  • Anes Kazagic

    (Department for Strategic Development, JP Elektroprivreda BiH d.d.-Sarajevo—Power utility, Vilsonovo setaliste 15, 71000 Sarajevo, Bosnia and Herzegovina)

  • Nihad Hodzic

    (Faculty of Mechanical Engineering, University of Sarajevo, Vilsonovo setaliste 9, 71000 Sarajevo, Bosnia and Herzegovina)

  • Sadjit Metovic

    (Faculty of Mechanical Engineering, University of Sarajevo, Vilsonovo setaliste 9, 71000 Sarajevo, Bosnia and Herzegovina)

Abstract

This paper presents a research on ash-related problems and emissions during co-firing low-rank Bosnian coals with different kinds of biomass; in this case woody sawdust and herbaceous energy crops Miscanthus. An entrained-flow drop tube furnace was used for the tests, varying fuel portions at a high co-firing ratio up to 30%wt woody sawdust and 10%wt Miscanthus in a fuel blend. The tests were supposed to optimize the process temperature, air distribution (including OFA) and fuel distributions (reburning) as function of SO 2 and NO x emissions as well as efficiency of combustion process estimated through the ash deposits behaviors, CO emissions and unburnt. The results for 12 co-firing fuel combinations impose a reasonable expectation that the coal/biomass/Miscanthus blends could be successfully run under certain conditions not producing any serious ash-related problems. SO 2 emissions were slightly higher when higher content of woody biomass was used. Oppositely, higher Miscanthus percentage in the fuel mix slightly decreases SO 2 emissions. NO x emissions generally decrease with an increase of biomass co-firing rate. The study suggests that co-firing Bosnian coals with woody sawdust and Miscanthus shows promise at higher co-firing ratios for pulverized combustion, giving some directions for further works in co-firing similar multi-fuel combinations.

Suggested Citation

  • Anes Kazagic & Nihad Hodzic & Sadjit Metovic, 2018. "Co-Combustion of Low-Rank Coal with Woody Biomass and Miscanthus: An Experimental Study," Energies, MDPI, vol. 11(3), pages 1-14, March.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:3:p:601-:d:135429
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    References listed on IDEAS

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    1. Li, Sen & Xu, Tongmo & Hui, Shien & Wei, Xiaolin, 2009. "NOx emission and thermal efficiency of a 300Â MWe utility boiler retrofitted by air staging," Applied Energy, Elsevier, vol. 86(9), pages 1797-1803, September.
    2. Wendi Chen & Fei Wang & Altaf Hussain Kanhar, 2017. "Sludge Acts as a Catalyst for Coal during the Co-Combustion Process Investigated by Thermogravimetric Analysis," Energies, MDPI, vol. 10(12), pages 1-11, December.
    3. Muhammad Aziz & Dwika Budianto & Takuya Oda, 2016. "Computational Fluid Dynamic Analysis of Co-Firing of Palm Kernel Shell and Coal," Energies, MDPI, vol. 9(3), pages 1-15, February.
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    Cited by:

    1. Hongbin Gao & Jingkuan Li, 2019. "Thermogravimetric analysis of the co-combustion of coal and polyvinyl chloride," PLOS ONE, Public Library of Science, vol. 14(10), pages 1-35, October.
    2. Francesco Calise & Mário Costa & Qiuwang Wang & Xiliang Zhang & Neven Duić, 2018. "Recent Advances in the Analysis of Sustainable Energy Systems," Energies, MDPI, vol. 11(10), pages 1-30, September.

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