THERMAL SCIENCE

International Scientific Journal

Milan Martinov

,

Branislav Veselinov

,

Savo Bojić

,

Đorđe Đatkov

INVESTIGATION OF MAIZE COBS CRUSHING: PREPARATION FOR USE AS A FUEL

ABSTRACT
Maize crop residues have great significance, particularly in developing countries, where the harvest of maize ears and their natural drying is widely applied. After drying and grain threshing, maize cobs are available for energetic use on farmers’ yards. Shortcomings for their energetic utilization by combustion, in comparison with wood, are higher contents of potassium, chlorine and nitrogen, and lower ash softening point. Tests in small wood chip boilers showed that the size of maize cobs should be reduced in order to facilitate better combustion and feeding with commonly used screw conveyors. Desirable length of particles should be 1-1.5 of their diameter. Within the framework of the Eureka project, a low-cost maize cobs crusher was developed and tested. It consists of a drum with six rows of knives, stationary comb-like knives and a screen situated below the drum. The test resulted with working parameters that enable appropriate size reduction. Analyses of crushed material showed that over 80% of particles were in the range of 3.15-45 mm, less than 1% smaller than 1 mm, and less than 1% larger than 63 mm. This granulation is comparable with size class P45 for wood chips in accordance with standard DIN CEN/TS 14961. Further investigations should focus on improving the combustion facilities, in order to avoid formation of ash slag, and keeping exhaust gas characteristics within values defined by legislation.
KEYWORDS
maize cobs, crushing, bio-fuel
PAPER SUBMITTED: 2010-04-07
PAPER REVISED: 2010-05-22
PAPER ACCEPTED: 2010-07-09
DOI REFERENCE: https://doi.org/10.2298/TSCI100407059M
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2011, VOLUME 15, ISSUE Issue 1, PAGES [235 - 243]
REFERENCES
  1. Johnson, J.M.F., Allmaras, R.R., Reicosky, D.C., Estimating source carbon from crop residues, roots and rhizodeposits using the grain-yield database, Agronomy Journal, 98 (2006), 3, pp. 622-636
  2. Graham, R.L., Nelson, R., Sheehan, J., Perlack, R.D., Wright, L.L., Current and potential U.S. corn stover supplies, Agronomy Journal, 99 (2007), 1, pp. 1-11
  3. Linden, D.R., Clapp, C.E., Dowdy, R.H., Long-term corn grain and stover yields as a function of tillage and residue removal in east central Minnesota, Soil & Tillage Research, 56 (2000), 3-4, pp. 167-174
  4. Kromer, K.H., Martinov, M., Tendenzen der Maisstrohernte, Landtechnik, 36 (1981), pp. 412-416
  5. Pordesimo, L.O., Hames, B.R., Sokhansanj, S., Edens, W.C., Variation in corn stover composition and energy content with crop maturity, Biomass and Bioenergy, 28 (2005), 4, pp. 366-374
  6. Hoskinson, R.L., Karlen, D.L., Birrell, S.J., Radtke, C.W., Wilhelm, W.W., Engineering, nutrient removal, and feedstock conversion evaluations of four corn stover harvest scenarios, Biomass and Bioenergy, 31 (2007), 2-3, pp. 126-136
  7. Martinov, M., Topalov, S., Characteristics and use possibilities of maize residues, Proceedings, The twelfth International Symposium of Yugoslav Society of Agricultural Engineering, Becici, Montenegro, 1984, pp. 564-572
  8. Martinov, M., Tesic, M., Ros, V., Simultaneous Support of res Production/Utilization and Development of Rural Areas, Proceedings, The second International Round Table: Agricultural Engineering and its Contribution, CIGR Working Group "Rural Development and the Preservation of Cultural Heritages", Kosjeric, Serbia, 2007, pp. 30-37
  9. Martinov, M., Tesic, M., Brkic, M., Efficiency and emission of crop residues combustion facilities in Serbia - status and needed measures for improvement, Thermal Science, 10 (2006), 2, pp. 189-194
  10. Martinov, M., Tesic, M., Stepanov, B., Solid biomass for household heating in rural areas - Case study for a village in Pannonia region of Serbia and Montenegro, Proceedings, The twenty seventh International conference of CIGR Section IV "The Efficient Use of Electricity and Renewable Energy Sources", Izmir, Turkey, 2005, pp. 171-176
  11. Wilaipon, P., Density equation of bio-coal briquettes and quantity of maize cob in Phitsanulok, Thailand, American Journal of Applied Sciences, 5 (2008), 12, pp. 1808-1811
  12. Schneider, C., Hartmann, H., Maize as energy crop - agricultural optimization for fuel supply, Technologie und Förderzentrum (TFZ), Straubing, Germany, 2006
  13. Zabaniotou, A., Ioannidou, O., Evaluation of utilization of corn stalks for energy and carbon material production by using rapid pyrolysis at high temperature, Fuel, 87 (2008), 6, pp. 834-843
  14. Ioannidou, O., Zabaniotou, A., Antonakou, E.V., Papazisi, K.M., Lappas, A.A., Athanassiou, C., Investigating the potential for energy, fuel, materials and chemicals production from corn residues (cobs and stalks) by non-catalytic and catalytic pyrolysis in two reactor configurations, Renewable and Sustainable Energy Reviews, 13 (2009), 4, pp. 750-762
  15. Bozovic, I., Radosavljevic, M., Zilic, S., Jovanovic, R., A genetic base of utilisation of maize cob as a valuable naturally renewable raw material, Genetika, 36 (2004), 3, pp. 245-256
  16. Akpan, U.G., Kovo, A.S., Abdullahi, M., Ijah, J.J., The production of ethanol from maize cobs and groundnut shells, AU Journal of Technology, 9 (2005), 2, pp. 106-110
  17. Kadam, K.L., McMillan, J.D., Availability of corn stover as a sustainable feedstock for bioethanol production, Bioresource Technology, 88 (2003), 1, pp. 17-25
  18. Brkic, M., Martinov, M., Efficiency and emission of solid biomass combustion facilities in Vojvodina. Proceedings, CIGR World congress: Agricultural engineering for better World, Bonn, Germany, 2006, pp. 733-734
  19. DIN CEN/TS 15149-1. Solid biofuels - Methods for the determination of particle size distribution. Part 1: Oscillating screen method using sieve apertures of 3.15 mm and above. 2006.
  20. DIN CEN/TS 15149-2. Solid biofuels - Methods for the determination of particle size distribution. Part 2: Vibrating screen method using sieve apertures of 3.15 mm and below. 2006.
  21. DIN CEN/TS 15149-3. Solid biofuels - Methods for the determination of particle size distribution. Part 3: Rotary screen method. 2006.
  22. Sokhansanj, S., Turhollow, A., Cushman, J., Cundiff, J., Engineering aspects of collecting corn stover for bioenergy, Biomass and Bioenergy, 23 (2002), 5, pp. 347-355
  23. Sudhagar, M., Tabil, L.G., Sokhansanj, S., Grinding performance and physical properties of wheat and barley straws, corn stover and switchgrass, Biomass and Bioenergy, 27 (2004), 4, pp. 339-352
  24. DIN 4185-1. Terms and symbols for screening surface - Part 1: Woven cloth screens. 2000.
  25. DIN 4185-2. Terms and symbols for screening surfaces - Part 2: Perforated plates. 2000.
  26. DIN 66144. Graphical representation of particle size distributions; log-normal grid. 1974.
  27. Batel, W., Einführung in die Korngrößenmesstechnik, Springer-Verlag, Berlin-Heidelberg-New York, 1971
  28. Neff, A., Kuprat, H., Twele, M., Nelles, M., Qualitaetsmanagement bei der Hackschnitzelbereitung, Proceedings, Tagung Forstwirtschaft als Energielieferant - Rahmenbedingungen, Praxisbeispiele, Perspektiven, Eberswalde, Germany, 2004, pp. 3-9
  29. DIN CEN/TS 14961. Solid biofuels - Fuel specifications and classes. 2005.
  30. ÖNORM M 7133. Chipped wood for energetic purposes - Requirements and test specifications. 1998.
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Investigation of maize cobs crushing: Preparation for use as a fuel

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