THERMAL POWER OF SMALL SCALE MANUALLY FED BOILER

Abstract

This study reviews test results of the combustion of square soybean straw bales used as fuel in manually fed boiler with nominal thermal power of 120 kWth. The influence of the mass flow rate (180, 265, 350, 435, and 520 kg h-1) of inlet air and flue gas recirculation (0%, 16.5%, and 33%) fed to the boiler furnace was continuously monitored. Direct method was used for determination of the boiler thermal power. Correlation between boiler thermal power and bale residence time has been observed and simple empirical equation has been derived. General conclusions are as follows: the increase of the flow rate of inlet air passing through the boiler furnace results in decrease of the bale residence time and increase of the boiler thermal power. Share of the flue gas recirculation of 16.5% increases bale residence time and decreases average boiler thermal power in all regimes except in the regime with inlet air flow rate of 265 kg h-1. In regime with 0% flue gas recirculation boiler thermal power was higher than nominal in regimes with 435 and 520 kg h-1 inlet air flow rates. In regimes having inlet air mass flow rate of 350 kg h-1 boiler thermal power is equal to the nominal power of 120 kWth.

Keywords

Dates

  • Submission Date2013-01-04
  • Revision Date2014-04-27
  • Acceptance Date2014-04-30
  • Online Date2014-05-04

DOI Reference

10.2298/TSCI130104046J

References

  1. Brkić, M., Janić, T., Igić, S., Assessment of Species and Quantity of Biomass in Serbia and Guidelines of Usage, Thermal Science, 16(2012)1, pp. 79-86
  2. Oka, S., Jovanović, Lj., Combustion Cycle and Combustion Lines of Biomass, in: Biomass - A Renewable Energy Source, Monograph (in Serbian), Yugoslav Society of Thermal Engineers, Vinča Institute of Nuclear Sciences, Belgrade, Serbia and Montenegro, 1998
  3. Dodić, S., Zekić, V., Rodić, V., Tica, N., Dodić, J., Popov, S.,The Economic Effects of Energetic Exploitation of Straw in Vojvodina, Renewable and Sustainable Energy Reviews, 16(2012)1, pp. 397-403
  4. Zekić, V., Rodić, V., Jovanović, M., Potentials and Economic Viability of Small Grain Residue Use as a Source of Energy in Serbia, Biomass and Bioenergy, 34(2010)12, pp. 1789 - 1795
  5. Repić, B., Dakić, D., Paprika, M., Mladenović, R., Erić, A., Soya Straw Bales Combustion in High-efficient Boiler, Thermal Science, 12(2008)4, pp. 51-60
  6. Janić, T., Brkić, M., Igić, S., Dedović, N, Lazić, R., Upravljanje sagorevanjem balirane biomase u toplovodnim kotlovskim postrojenjima, Savremena poljoprivredna tehnika, 36(2010)4, pp. 366- 372
  7. Turanjanin, V., Đurović, D., Dakić, D., Erić, A., Repić, B., Development of the Boiler for Combustion of Agricultural Biomass by Products, Thermal Science, 14(2010)3, pp. 707-714
  8. Obaidullah, M., Bram, S., Verma, V., K., De Ruyck, J., A Review on Particle Emissions from Small Scale Biomass Combustion, International Journal of Renewable Energy Research- IJRER, 2(2012)1, pp. 147-159
  9. Igić, S., Impact of Sort and Condition of Baled Straw, Incoming Air Quantity and Composition on Boiler Energy Efficiency, Ph. D. thesis, University of Novi Sad, Novi Sad, Serbia, 2008
  10. Janić, T., Combustion Kinetics of Wheat Straw, Ph. D. thesis, University of Novi Sad, Novi Sad, Serbia, 2001
  11. Brkić, Lj., Živanović, T., Thermal Calculation on Steam Boilers, University of Belgrade, Belgrade, 2006.
  12. Bubenheim, D., L., Patterson, M., Wignarajah, K., Flynn, M., Incineration of Biomass and Utilization of Product Gas as a CO2 Source for Crop Production in Closed Systems: Gas Quality and Phytotoxicity, Adv Space Res, 20(2007)10, pp. 1799-2054
  13. Dedović, N., Igić, S., Matić-Kekić, S., Janić, T., Excess Air Rate During Straw Bale Combustion and Review of Mathematical Models, Contemp Agric Eng 36(2010)4, pp. 344-356
  14. Strasser, H., Mathematical Theory of Statistics, De Gruyter Berlin, New York, 1985
  15. Zhaosheng, Y, Xiaoqian, M., Yanfen, L., Mathematical Modeling of Combustion in a Grate-fired Boiler Burning Straw and Effect of Operating Conditions Under Air and Oxygen-enriched Atmospheres, Renewable Energy, 35(2010)5, pp. 895-903
  16. Zhou, H., Jensen, A., D., Glarborg, P., Jesnsen, P., A., Kavaliuskas, A., Numerical Modeling of Straw Combustion in a Fixed Bed, Fuel, 84 (2005)4, pp. 389-403.
Volume 19, Issue 1, Pages329 -340