State of the Art in Rice Husk Gasification

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Talk given at the ETHOS Conference 2011 about the latest developments in rice husk cook stove technology. Rice husk cook stoves are an interesting technology because of the amount of waste rice husk in developing countries worldwide.

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  • I'm patent examiner of NOIP of Vietnam. I'm trying to search a continuous rice husk stove with a husk suplying hopper. If you have any information about stove of this type (with publication date before Oct, 2009), please send me! My e-mail add: tiendotrong2002@yahoo.com. Thank you!
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  • Thank you. If you want any more information check out smallredtile.com (and/or send us an email)
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  • Very informative!
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State of the Art in Rice Husk Gasification

  1. 1. State of the Art in Rice Husk Cook Stoves Marc Paré Mechanical Engineering // Georgia Tech Jan 2011 // ETHOS ConferenceSaturday, January 29, 2011
  2. 2. Saturday, January 29, 2011
  3. 3. [Resource Opportunity] [Properties of Rice Husk] 100 kW ($4000) [Resulting Notable Designs] 0.8 kW ($30) 0.3 kW 0.3 kW ($20) ($10)Saturday, January 29, 2011
  4. 4. World Rice Consumption 2008 (USDA)Saturday, January 29, 2011
  5. 5. Saturday, January 29, 2011
  6. 6. How much energy is out there? 432,039 metric tons of rice consumed / year x 0.6 milling rate x 12 GJ / metric ton / 1.3 MJ to cook a meal 2 billion meals / yearSaturday, January 29, 2011
  7. 7. Properties of Rice Husk • Energy Content • Chemical Composition • Angle of Repose • Thermal Conductivity • Air Flow ResistanceSaturday, January 29, 2011
  8. 8. Properties of Rice Husk or Understanding a Really Strange Fuel • Energy Content Low • Chemical Composition High in Silicates • Angle of Repose Causes Bridging • Thermal Conductivity Can Put Out Fires • Air Flow Resistance Darn HighSaturday, January 29, 2011
  9. 9. Energy Content Hull 3000 kcal / kg Char AshSaturday, January 29, 2011
  10. 10. Saturday, January 29, 2011
  11. 11. Ash Chemical Composition Al2O3 6% MgO Losses 2% 9% Fe2O3 CaO 1% 2% SiO2 80%Saturday, January 29, 2011
  12. 12. Angle of Repose θSaturday, January 29, 2011
  13. 13. Thermal Conductivity Test Results from ASTM testing by R&D Services of Cookville, Tennessee (Courtesy Dr. Paul Olivier)Saturday, January 29, 2011
  14. 14. Dr. Paul Olivier http://www.esrla.com/Saturday, January 29, 2011
  15. 15. Resistance to Air Flow • Pressure drop higher than that generated by stack effect in a natural draft cook stoveSaturday, January 29, 2011
  16. 16. Summary, courtesy of Eldon Beagle “The high percentage of silica in rice hulls and the peculiar silica-cellulose structure impede uniform and thorough burning of the hulls in a combustion process.” “Eldon Beagle set a pile of rice hulls 300’x500’x50’ on fire and they burned for six months.” “However, husk cannot be burnt easily or cleanly with excess air, and energy recovery is very low as the heat produced cannot be utilized in a beneficial manner.” Beagle (1978), p. 8. ,Velupillai (1996), p. 18., Ibid., p. 24. , Ibid., p. 25.Saturday, January 29, 2011
  17. 17. It can’t be done?Saturday, January 29, 2011
  18. 18. Gasification • Two-stage • Cleaner burn • More fuels • Air-controlledSaturday, January 29, 2011
  19. 19. Power Generation $34 / kW 30-300 kW • Fluidised bed • Projects around the world Dr. Alexis BelonioSaturday, January 29, 2011
  20. 20. Forced Air Batch Gasification $113 0.8 kW • Requires a fan and electricity • Blue flame • Easy to control Dr. Alexis Belonio • Batch operationSaturday, January 29, 2011
  21. 21. Dr. Paul OliverSaturday, January 29, 2011
  22. 22. Saturday, January 29, 2011
  23. 23. Continuous Quasi-Gasification $30 0.3 kW • Requires tapping every few minutes • Continuous operation • Easy to start • Emissions?Saturday, January 29, 2011
  24. 24. Saturday, January 29, 2011
  25. 25. Natural Draft Batch Gasification $20 0.3 kW • Chimney provides necessary draft • Very little material • Batch operationSaturday, January 29, 2011
  26. 26. Saturday, January 29, 2011
  27. 27. Saturday, January 29, 2011
  28. 28. Future? • TEG (or thermopile) to power fan • More autonomous continuous stove • Blue flame on natural draft stove • More options for cooking surface constructionSaturday, January 29, 2011
  29. 29. smallredtile.comSaturday, January 29, 2011
  30. 30. Sources • IRRI World Rice Statistics http://beta.irri.org/solutions/index.php? option=com_content&task=view&id=250 • Chemical Analysis of Rice Husk Ash: http://www.scribd.com/doc/3085035/Chemical-Analysis-of- Rice-Husk-Ash • Rice and Straw Properties (Rice Knowledge Bank) http://www.knowledgebank.irri.org/rkb/ index.php/rice-milling/contributions-and-references-milling/further-information-byproducts/ husk-and-straw-properties • “No other plant offal even approaches the amount of silica found in rice husks.” Beagle, E.C. 1978. FOA Agricultural Services Bulletin 31, p. 8. • Kaupp, A. (1984). Gasification of Rice Hull: Theory and Praxix. Federal Republic of Germany: GATE/GTZ. 303pp. • http://gasifiers.bioenergylists.org/content/continuous-flow-rice-husk-gasifier-thermal-application • Sawdust stove image: http://www.motherearthnews.com/Do-It-Yourself/1974-11-01/How-To- Sawdust-Stove.aspx •Saturday, January 29, 2011

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