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Experimental study of wood downdraft gasification for an improved producer gas quality through an innovative two-stage air and premixed air/gas supply approach |
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| Authors: | Jaojaruek Kitipong Jarungthammachote Sompop Gratuito Maria Kathrina B Wongsuwan Hataitep Homhual Suwan |
| Affiliation: | a Energy Research Laboratory of Mechanical Engineering (ERLoME), Faculty of Engineering KPS, Kasetsart University, Khamphengsaen, Nakornpathom, Thailand b Faculty of Engineering at Si Racha, Kasetsart University Si Racha Campus, 199 Sukhumvit Road, Si Racha Chonburi, Thailand c Regional Energy Resources Information Center (RERIC), Energy FoS, SERD, Asian Institute of Technology, Thailand d Mechanical Engineering, Faculty of Engineering KPS, Kasetsart University, Khamphengsean, Nakornpathom, Thailand |
| Abstract: | This study conducted experiments on three different downdraft gasification approaches: single stage, conventional two-stage, and an innovative two-stage air and premixed air/gas supply approach. The innovative two-stage approach has two nozzle locations, one for air supply at combustion zone and the other located at the pyrolysis zone for supplying the premixed gas (air and producer gas). The producer gas is partially bypassed to mix with air and supplied to burn at the pyrolysis zone. The result shows that producer gas quality generated by the innovative two-stage approach improved as compared to conventional two-stage. The higher heating value (HHV) increased from 5.4 to 6.5 MJ/Nm3. Tar content in producer gas reduced to less than 45 mg/Nm3. With this approach, gas can be fed directly to an internal combustion engine. Furthermore, the gasification thermal efficiency also improved by approximately 14%. The approach gave double benefits on gas qualities and energy savings. |
| Keywords: | Downdraft gasification Innovative two-stage downdraft gasifier Producer gas quality Thermodynamic and thermal efficiency analysis in gasification Tar cracking |
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