碩士 / 國立中興大學 / 森林學系所 / 100 / Gasification can be defined as the conversion of feedstocks (e.g., biomass, waste, coal, etc.) to combustible gas (H2, CO, CH4 and CnHm) by partial oxidation at the elevated temperature. In this study, the Spirulina platensis torredied pellet and Eucalyptus globulus torrefied pellet were co-gasified in a 30 kWth bubbling fluidized bed gasifier to investigate the effect of gasification temperature, equivalence ratio, mixed ratios and steam injection on syngas compositions, the lower heating value, and tar content, etc. Before feeding into the gasifier, the higher heating value of microalgae and Eucalyptus globulus pellets can be increased after torrefaction treatment. With a lower O/C ratio, torrefied biomass can favor gasification. After gasification, the CO, CH4, H2, tar content and lower heating value of syngas decrease with increasing the equivalence ratio, but CO2 shows the contrary tendency. In addition, CO content of syngas increased firstly then decreased with increasing the mixed ratio of the microalgae torrified pellet, but CO2 show the contrary tendency. It can also be seen, adding more microalgae pellet during co-gasification can cause sintering phenomenon. This is because that expansion of the microalgae torrified pellet after heating caused agglomeration of the bed materials and defluidization. Moreover, steam injection can increase H2 content of syngas and reduce CH4 content, but tar content increased. An optimal operating condition can be found that the gasification temperature is 800℃, ER is 0.3, and mixed ratio of the microalgae is 30%.
| Identifer | oai:union.ndltd.org:TW/100NCHU5360036 |
| Date | January 2012 |
| Creators | Ming-Huan Hsieh, 謝明桓 |
| Contributors | 吳耿東 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 95 |
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