采用离散单元法DEM（discrete element method）对圆柱形生物质颗粒和钢球颗粒在滚筒中的混合进行了数值模拟,分析了滚筒转速和颗粒数量比对混合质量的影响。结果表明：在本文设定的工况下,颗粒的混合模式为阶梯模式,并且颗粒在混合时...采用离散单元法DEM（discrete element method）对圆柱形生物质颗粒和钢球颗粒在滚筒中的混合进行了数值模拟,分析了滚筒转速和颗粒数量比对混合质量的影响。结果表明：在本文设定的工况下,颗粒的混合模式为阶梯模式,并且颗粒在混合时可以分成3个区域,即左面的单层钢球颗粒区、中间的钢球颗粒和生物质颗粒混合区、右面的生物质颗粒堆积区。左右两边的颗粒混合效果较差,中间的颗粒混合效果较好。当滚筒转速相同时,钢球颗粒和生物质颗粒数量比为3000∶200时的颗粒混合效果比钢球颗粒和生物质颗粒数量比为3000∶100时的好,即当钢球颗粒数量远大于生物质颗粒数量时,增加生物质颗粒的数量可以提高混合效果。在钢球颗粒和生物质颗粒数量比相同的情况下,当滚筒转速在5-25r/min的范围内,滚筒转速越高,颗粒的混合质量越好,并且颗粒混合达到稳定的时间就越短。展开更多
The dynamic sulfur emission from combustion of blends of coal liquefaction residue(CLR) and biomass (sawdust, MX and leaves, SY) was studied in a tubular furnace. The results show that the curves of sulfur release in ...The dynamic sulfur emission from combustion of blends of coal liquefaction residue(CLR) and biomass (sawdust, MX and leaves, SY) was studied in a tubular furnace. The results show that the curves of sulfur release in combustion of CLR or the blends gently increase with temperature, and the curves of sulfur release rate have two-peaks. Two sulfur release peaks are generated from different organic and inorganic sulfur forms in CLR and biomass. For the blends, the sulfur release is mainly determined by the high sulfur content of blends, which is CLR. With the decrease of CLR ratio, the amount of sulfur release and two maximum values of sulfur release rate derived from blends combustion all decrease, while the times for occurrence of the two characteristic peaks are both postponed.展开更多
文摘采用离散单元法DEM（discrete element method）对圆柱形生物质颗粒和钢球颗粒在滚筒中的混合进行了数值模拟,分析了滚筒转速和颗粒数量比对混合质量的影响。结果表明：在本文设定的工况下,颗粒的混合模式为阶梯模式,并且颗粒在混合时可以分成3个区域,即左面的单层钢球颗粒区、中间的钢球颗粒和生物质颗粒混合区、右面的生物质颗粒堆积区。左右两边的颗粒混合效果较差,中间的颗粒混合效果较好。当滚筒转速相同时,钢球颗粒和生物质颗粒数量比为3000∶200时的颗粒混合效果比钢球颗粒和生物质颗粒数量比为3000∶100时的好,即当钢球颗粒数量远大于生物质颗粒数量时,增加生物质颗粒的数量可以提高混合效果。在钢球颗粒和生物质颗粒数量比相同的情况下,当滚筒转速在5-25r/min的范围内,滚筒转速越高,颗粒的混合质量越好,并且颗粒混合达到稳定的时间就越短。
文摘The dynamic sulfur emission from combustion of blends of coal liquefaction residue(CLR) and biomass (sawdust, MX and leaves, SY) was studied in a tubular furnace. The results show that the curves of sulfur release in combustion of CLR or the blends gently increase with temperature, and the curves of sulfur release rate have two-peaks. Two sulfur release peaks are generated from different organic and inorganic sulfur forms in CLR and biomass. For the blends, the sulfur release is mainly determined by the high sulfur content of blends, which is CLR. With the decrease of CLR ratio, the amount of sulfur release and two maximum values of sulfur release rate derived from blends combustion all decrease, while the times for occurrence of the two characteristic peaks are both postponed.
