Thermal Engineering

, Volume 66, Issue 2, pp 133–137 | Cite as

Conditions and Characteristics in Ignition of Composite Fuels Based on Coal with the Addition of Wood

  • G. V. Kuznetsov
  • S. A. YankovskiiEmail author


In this paper, we experimentally determined the conditions and characteristics of the ignition of the fuel mixture samples of various composition of crushed coal and wood in stationary air heated to high temperatures (from 600 to 1000°C). The heating of fuel mixtures under study that are promising for heat power engineering and their subsequent ignition and combustion were registered by using a high-speed video camera (image size is 1024 × 1024 pixels, frame rate is up to 105 frame/s), which ensures high reliability of the obtained results. The ignition delay times of all the studied mixtures based on lean and long-flame coals were established to decrease with an increase in the wood fraction. The limits of the stable (with small deviations of the delay time from the average values) ignition of weights of the studied mixtures are selected. At an increase in the wood waste fraction up to 50%, the decrease in the ignition delay time of mixed fuel based on grade T coal was found to be 11.2% at 600°C and 55.3% at 1000°C. For fuel mixtures based on grade D coal and wood, similar indicators are 17.6 and 64.3%. At temperatures typical for the furnace environment (approximately 1000°C), the ignition delay time for such fuels was determined to be less than 1 s, which is significantly less than the similar ignition characteristics of long-flame and lean-coal dust. The ash content of the fuel mixture is established to be a nonadditive characteristic relative to the ash content of the corresponding coal and wood. The increase in the wood fraction to 50% leads to a decrease in ash content to 10.44% for grade D coal and to 11.08% for grade T coal.


coal wood biomass composite fuel thermal decomposition combustion thermal analysis 



This work was supported by the National Research Tomsk Polytechnic University, project no. VIU-IHE-300/2018.


  1. 1.
    F. Birol, Key World Energy Statistics (Int. Energy Agency, 2016).Google Scholar
  2. 2.
    “Dynamics of electric energy consumption as an indicator of economic activity,” Byull. Sots.-Ekon. Krizisa v Rossii, No. 10 (2016). Scholar
  3. 3.
    D. A. Krylov and G. P. Sidorova, “Ways to reduce the ecological impact of coal thermal power plants of Russia on the environment,” Gorn. Inf.-Anal. Byull., No. 11, 277–285 (2015).Google Scholar
  4. 4.
    N. N. Ezhova, A. S. Vlasov, and L. M. Delitsyn, “Modern flue gas cleaning methods,” Ekol. Prom. Proizvod., No. 2, 50–57 (2006).Google Scholar
  5. 5.
    Yu. I. Sanaev, “Electric filters: Installation, adjustment, testing, operation,” in Survey Information (TsINTIkhimneftemash, Moscow, 1984), in Ser.: KhM-14 [in Russian].Google Scholar
  6. 6.
    V. I. Kovenskii, “Conditions for efficient combustion of solid fuel in fluidized-bed furnaces,” Therm. Eng. 59, 604–609 (2012).CrossRefGoogle Scholar
  7. 7.
    G. S. Aslanyan, Ecologically Safe Coal Technologies. Analytical Review (Ts. Energ. Polit., Moscow, 2004) [in Russian].Google Scholar
  8. 8.
    Energy and Air Pollution. World Energy Outlook Special Report, 2016 (Int. Energy Agency, Paris, 2016). https:// WorldEnergyOutlookSpecialReport2016EnergyandAir Pollution.pdf.Google Scholar
  9. 9.
    T. Sonobe, N. Worasuwannarak, and S. Pipatmanomai, “Synergies in copyrolysis of Thai lignite and corncob,” Fuel Process Technol. 89, 1371–1378 (2008).CrossRefGoogle Scholar
  10. 10.
    K. Yu. Vershinina, R. I. Iegorov, and P. A. Strizhak, “The ignition parameters of the coal-water slurry droplets at the different methods of injection into the hot oxidant flow,” Appl. Therm. Eng. 107, 10–20 (2016).CrossRefGoogle Scholar
  11. 11.
    G. V. Kuznetsov, V. V. Salomatov, and S. V. Syrodoy, “Numerical simulation of ignition of particles of a coal–water fuel,” Combust., Explos., Shock Waves 51, 409–415 (2015).CrossRefGoogle Scholar
  12. 12.
    F. Al. Mansour and J. Zuwala, “An evaluation of biomass co-firing in Europe,” Biomass Bioenergy 34, 620–629 (2010).CrossRefGoogle Scholar
  13. 13.
    V. L. Strakhov, A. N. Garashchenko, G. V. Kuznetsov, and V. P. Rudzinskii, “Mathematical simulation of thermophysical and thermochemical processes during combustion of intumescent fire–protective coatings,” Combust., Explos., Shock Waves 37, 178–186 (2001).CrossRefGoogle Scholar
  14. 14.
    Ya. B. Zel’dovich and D. A. Frank-Kamenetskii, “Theory of thermal spread of flame,” Zh. Fiz. Khim. 12, 31–35 (1938).Google Scholar
  15. 15.
    K. Veijonen, P. Vainikka, T. Järvinen, and E. Alakangas, Biomass Co-Firing: An Efficient Way to Reduce Greenhouse Gas Emissions (Eur. Bioenergy Networks, Espoo, Finland, 2000). ener/files/documents/2003_cofiring_eu_bionet.pdf.Google Scholar
  16. 16.
    Y. Shao, J. Wang, F. Preto, J. Zhu, and C. Xu, “Ash deposition in biomass combustion or co-firing for power/heat generation,” Energies 5, 5171–5189 (2012).CrossRefGoogle Scholar

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© Pleiades Publishing, Inc. 2019

Authors and Affiliations

  1. 1.National Research Tomsk Polytechnic UniversityTomskRussia

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