skip to main content

Effects on NOx and SO2 Emissions during Co-Firing of Coal With Woody Biomass in Air Staging and Reburning

1Universtity of Sarajevo, Bosnia and Herzegovina

2Faculty of Mechanical Engineering, Bosnia and Herzegovina

3University of Sarajevo, Bosnia and Herzegovina

4 Elektroprivreda BiH d.d. - Sarajevo, Bosnia and Herzegovina

5 Power utility of Bosnia and Herzegovina, Bosnia and Herzegovina

View all affiliations
Published: 18 Feb 2018.
Editor(s): H Hadiyanto

Citation Format:

Co-firing coal with different types of biomass is increasingly being applied in thermal power plants in Europe. The main motive for the use of biomass as the second fuel in coal-fired power plants is the reduction of CO2 emissions, and related financial benefits in accordance with the relevant international regulations and agreements. Likewise, the application of primary measures in the combustion chamber, which also includes air staging and/or reburning, results in a significant reduction in emission of polluting components of flue gases, in particular NOx emissions. In addition to being efficient and their application to new and future thermoblocks is practically unavoidable, their application and existing conventional combustion chamber does not require significant constructional interventions and is therefore relatively inexpensive. In this work results of experimental research of co-firing coals from Middle Bosnian basin with waste woody biomass are presented. Previously formed fuel test matrix is subjected to pulverized combustion under various temperatures and various technical and technological conditions. First of all it refers to the different mass ratio of fuel components in the mixture, the overall coefficient of excess air and to the application of air staging and/or reburning. Analysis of the emissions of components of the flue gases are presented and discussed. The impact of fuel composition and process temperature on the values of the emissions of components of the flue gas is determined. Additionally, it is shown that other primary measures in the combustion chamber are resulting in more or less positive effects in terms of reducing emissions of certain components of the flue gases into the environment. Thus, for example, the emission of NOx of 989 mg/ measured in conventional combustion, with the simultaneous application of air staging and reburning is reduced to 782 mg/, or by about 21%. The effects of the primary measures applied in the combustion chamber are compared and quantified with regard to conventional combustion of coals from Middle Bosnian basin.

Article History: Received: November 5th 2017; Revised: Januari 6th 2018; Accepted: February 1st 2018; Available online

How to Cite This Article: Hodžić, N., Kazagić, A., and Metović, S. (2018) Experimental Investigation of Co-Firing of Coal with Woody Biomass in Air Staging and Reburning. International Journal of Renewable Energy Development, 7(1), 1-6.


Fulltext View|Download
Keywords: Co-firing, coal, biomass, reburning, NOx emissions

Article Metrics:

  1. ADEG - Advanced Decentralised Energy Generation Systems in Western Balkans (2007) Projekt FP6 - Final Report, National Technical University of Athens, Institut IVD Stuttgart, Fakultet Strojarstva i Brodogradnje Zagreb, Mašinski fakultet Sarajevo, Institut Vinča, IST Portugal
  2. Data base VGB, 06-2010, 09-2012
  3. Hodžić, N. (2016) Istraživanje kosagorijevanja uglja i biomase usmjereno na smanjenje emisija primarnim mjerama u ložištu, PhD Thesis, Universtity of Sarajevo, Mechanical Engineering Faculty
  4. Hodžić, N., Kazagić, A., & Smajević, S. (2015) Motiv za uvođenje u praksu kosagorijevanja uglja i drvne biomase u TE Kakanj - iskustva iz probnog pogona podržana laboratorijskim istraživanjima, 12. Savjetovanje bosansko-hercegovačkog komiteta Cigré, Neum, Bosna i Hercegovina
  5. Hodzic, N., Kazagic, & A., Smajevic, I. (2016) Influence of multiple air staging and reburning on NOx emissions during co-firing of low rank brown coal with woody biomass and natural gas, Applied Energy 168, 38–47
  6. Hodžić, N., Metović, S., Džaferović, E., & Kazagić, A. (2017) Woody Sawdust and Miscanthus Co-firing - Towards more Sustainable Solution for Low-rank Coal - a Lab-scale Investigation, 8th European Combustion Meeting (ECM 2017), Dubrovnik, Croatia
  7. Hodžić, N., Metović, & S., Kazagić, A. (2017) Effects of primary measures in combustion chamber on co-firing of coal with woody biomass, The International Symposium on Advances in Mechanical Engineering – ISAME, NINTH (9th) days of BHAAAS in Bosnia and Herzegovina, Teslić
  8. Hodžić, N., Smajević, I., & Kazagić, A. (2015) Mitigation Ash-related Problems by Cofiring Coal with Woody Biomass in Case of Kakanj Thermal Power Plant - Experimental and Trial Run, 23rd European Biomass Conference And Exhibition (EUBCE 2015), Wienna, Austria
  9. Kakaras, E., (2000) Low emission co-combustion of different waste wood species and lignite derived products in industrial power plants, XXXII Krafwerkstechnisches Colloquium: Nutzung schwieriger Brennstoffe in Kraftwerken, Dresden, p. 37-46
  10. KEMA (2009) Technical status of biomass co-firing, IEA Bioenergy Task 32, Netherlands
  11. Kupka, T., Mancini, M., Irmer, M., & Weber, R. (2008) Investigation of ash deposit formation during co-firing of coal with sewage sludge, saw-dust and refuse derived fuel, Fuel, 87(12), 2824-2837
  12. Rozendaal, M. (1999) Impact of coal quality on NOx emissions from power plants. Delft: Delft University of Technology
  13. Uticaj kvaliteta uglja na troškove proizvodnje električne energije i cijenu uglja - Study EPBIH (2014); Naručilac: JP Elektroprivreda BiH d.d. Sarajevo, Izvršilac: Mašinski fakultet Sarajevo i Rudarski institut d.d. Tuzla, Sarajevo
  14. Wang, Y., Wang, X., Hu, Z., Li, Y., Deng, S., Niu, B., & Tan, H. (2015) NO Emissions and Combustion Efficiency during Biomass Co-firing and Air-staging, Bio Resources,10(3), 3987-3998
  15. Williams, A., Jones, J.M., Ma, L., & Pourkashanian, M., (2012) Pollutants from the combustion of solid biomass fuels, Progress in Energy and Combustion Science, 38(2), 113-137
  16. Wischnewski, R., Werther, J., & Heidenhof, N., (2006) Synergy Effects of the Co-combustion of Biomass and Sewage Sludge with Coal in the CFB Combustor of Stadtwerke Duisburg AG., VGB Power Tech, 86(12), 63-70

Last update:

No citation recorded.

Last update:

No citation recorded.