循环流化床煤热解拔头工艺循环颗粒流分配

利用直径0.09 m、高12 m的冷态循环流化床装置,研究了循环流化床煤热解拔头工艺中分别与提升管燃烧器和热解器连接的2个颗粒循环回路间存在的压差对循环颗粒在两回路间分配的影响,设计了可补偿压差的颗粒分配阀. 结果表明,增加分配阀一侧的流动阻力可阻碍该侧的颗粒流率,调节分配阀阻力可补偿两颗粒循环回路间的压差,有效调控颗粒流的分配. 提出了优化颗粒分配阀结构的方案,在总颗粒循环量126.9 kg/(m2×s)的条件下对分配阀低压侧的颗粒分配比例达到了0~52.4%.

Circulating Granular Flow Partition in Pyrolytic Topping of Coal with a Circulating Fluidized Bed

The pressure difference between two particle-circulation loops in a circulating fluidized bed (CFB) for coal pyrolysis topping process was investigated to examine its effect on the partition of circulated particles. Experiments were conducted in a laboratory CFB of 12 m in height and 0.09 m in i.d. of its riser. The results demonstrated that raising the flow resistance in one side of the particle partition valve reduced the flow rate of particles into this side, implying that the pressure difference between the two circulation loops was one of the important factors affecting the performance of particle partition valve. A proposal was made and verified experimentally on how to control the pressure difference to optimize the particle partition in the valve. The realized particle partition to the low-pressure side of the partition valve varied in 0~52.4% under a total particle circulation rate of 126.9 kg/(m2×s).