Air Gasification of Dried Sewage Sludge in a Fluidized Bed: Effect of the Operating Conditions and In-Bed Use of Alumina
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- 作者：Joan J. Manyà ; José ; L. Sá ; nchez ; Alberto Gonzalo ; and Jesú ; s Arauzo
- 刊名：Energy & Fuels
- 出版年：2005
- 出版时间：March 2005
- 年：2005
- 卷：19
- 期：2
- 页码：629 - 636
- 全文大小：143K
- 年卷期：v.19,no.2(March 2005)
- ISSN：1520-5029
文摘
Sewage sludge has recently become a particularly important problem all over the world becauseof its harmful impact on the environment. The consequent need to develop alternative processesfor the use of dried sewage sludge for energy purposes, such as gasification, requires experimentaltests in order to quantify the potential energy power of the sludge, as well as to evaluate theoptimum conditions for its gasification. There is, however, little information available. In thisstudy, the gasification with air of dried sewage sludge was experimentally investigated using abubbling fluidized bed. Attention was focused on the influence of the temperature (750-850 
C),the equivalence ratio (25-35%), and the fluidizing velocity (5, 8, and 11 times the value of umf)on the product yields, gas composition, thermal efficiency, and tar content. The results obtainedshow the potential for using sewage sludge gasification with air as an option for energy recoveryand waste treatment. However, the high tar yield obtained needs to be reduced. Consequently,experiments involving the in-bed use of alumina were carried out. This primary measure hasproven effective for tar removal (the content decreases by nearly 40% with in-bed use of aluminaat 5 wt%).
C),the equivalence ratio (25-35%), and the fluidizing velocity (5, 8, and 11 times the value of umf)on the product yields, gas composition, thermal efficiency, and tar content. The results obtainedshow the potential for using sewage sludge gasification with air as an option for energy recoveryand waste treatment. However, the high tar yield obtained needs to be reduced. Consequently,experiments involving the in-bed use of alumina were carried out. This primary measure hasproven effective for tar removal (the content decreases by nearly 40% with in-bed use of aluminaat 5 wt%).