Dynamic behaviour of sewage sludge incineration in a large-scale bubbling fluidised bed in relation to feeding-rate variations
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- 作者：Yao Bin Yang ; Lynne Sliwinski ; Vida Sharifi ; Jim Swithenbank
- 关键词：Sewage sludge ; Fluidised bed ; Incineration ; Mathematical modelling ; Dynamic
- 刊名：Fuel
- 出版年：2008
- 出版时间：July 2008
- 年：2008
- 卷：87
- 期：8-9
- 页码：1552-1563
- 全文大小：381 K
文摘
In this paper, a mathematical model is developed for the simulation of a large-scale sewage sludge incineration plant. The model assumes the bed to consist of a fast gas phase, an emulsion phase and a fuel particle phase with specific consideration for thermally-thick fuel particles. The developed model is employed to predict the dynamic response of the bed combustion to fluctuations in sludge feeding-rate. Calculation results indicate that the bed combustion is sensitive to fluctuations with response times greater than 30 min, but severe delays exist for both outlet oxygen level and bed temperatures; from 6 to 13 min for O2 and 22–45 min for temperatures. Depending on the fluctuation frequency, the corresponding phase shifts are 39–96° for outlet O2, 138–336° for bed temperature and 80–336° for freeboard temperature.