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In order to predict the mass balance of a 300 MWe circulating fluidized bed (CFB) boiler under design process, the ash formation and attrition characteristic of the design fuel mixed with gangue, middling and slime were investigated with Tshinghua own process. In addition, the mass balance in this CFB boiler was simulated with 1D mass balance model, giving the ratio of the ashes, particle size distribution of circulating solid materials and solid circulating rat, Gs. By comparing the residence time distribution and the burn out time required for different size, the minimum bed pressure drop (BPD) or bed inventory in the furnace was determined for different mixing ratio among the three coals.
The results show that under each mixing ratio, the solid circulating flux and solid suspension density in the upper furnace can meet the requirement of heating transfer. However, the minimum BPD or bed inventory required to meet the burn out time of the coarse solids was different. For in the case with the ratio among gangue, middling and slime as 5:3:2, the lowest value is 12 kPa, which will cause serious erosion and more power consumption. Because the middling has lower ash content, higher reactivity and better ash formation, increasing the proportion of the middling (1:5:4) will decrease the BPD greatly to 5 kPa, not only meet the requirements of material balance and burn time for coarse solids easily, but also realize the energy saving operation.
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Yue GX, Tang Z, Qian M. Experimental investigation on the coal ash size formation in CFB combustion. In: Proceedings of the 40th IEA FBC meeting, Finland; p. 114–120.
Yang HR, Yue GX, Xiao XB, et al. 1D modeling on the material balance in CFB boiler. Chem Eng Sci. 2005;60:5603–11. CrossRef
- Mass Balance Performance of A 300 MW CFB Boiler Burning Blend Fuel with Different Mixing Ratio
- Springer Berlin Heidelberg