PROCESS ANALYSIS OF LIGNITE CIRCULATING FLUIDIZED BED BOILER COUPLED WITH PYROLYSIS TOPPING
We developed a comprehensive process model in ASPEN Plus to simulate the energy and mass balances of a lignite-fueled atmospheric circulating fluidized bed (CFB) boiler integrated with coal predrying and pyrolysis topping. In this model, it is assumed that the heat from exhausted flue gas was employed for coal predrying, and the sensible heat derived from circulated bed material was used for the pyrolysis topping (endothermic process). The simulation was conducted with respect to the Yunnan Kaiyuan CFB boiler, and two representative lignite coals from Xiao Long Tan (XLT) and Xin Shao (XS) were considered. The result shows that the predrying of coal with the sensible heat of above 363 K from flue gas, the amount of coal consumed in the boiler can be reduced by 3.5％ and 5.3％ for XLT lignite and XS lignite, respectively. It was also found that integration of pyrolysis topping with the boiler increased the coal consumption of the boiler, and the extent of consumption-increase varies with the yields of tar and gas in the pyrolysis topping process. For a gas yield of 5.2％ and a tar yield of 5-6％, the consumption of XS lignite increased by about 20％ comparing to that in the case without topping.
Pyrolysis topping Coal drying Process modeling CFB boiler
Baoqun Wang Li Dong Yin Wang Y.Matsuzawa Guangwen Xu
State Key Laboratory of Multiphase Complex System, Institute of Process Engineering,Chinese Academy Research Laboratory, IHI Corporation, Ltd., Yokohama, Japan State Key Laboratory of Multiphase Complex System, Institute of Process Engineering, Chinese Academy
国际会议
第20届国际流化床燃烧会议(20th International Conference on Fluidized Bed Combustion)
西安
英文
706-711
2009-05-18（万方平台首次上网日期，不代表论文的发表时间）