Abstract A circulating fluidized bed boiler is designed and built to conduct visualization study by combining the circulating fluidized bed heat transfer technology and boiler. Water and polyformaldehyde particles are selected as the working media. The effect of the operating parameters such as the amount of added particles and feedwater flow rate on the fluidization and distribution of particles are investigated by using a charge coupling device. Results show that the particles can be normally fluidized and circulated at proper feedwater flow rate and amount of added particles. The solid holdup in the riser bundle increases with increased feedwater flow rate and amount of added particles. With increased feedwater flow rate, the nonuniform degree of particle distribution decreases. The amount of added particles has less influence on particle distribution than feedwater flow rate. The average solid holdup in the water wall tubes is close to that in the splayed flue tubes.

中文翻译：

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液固循环流化床锅炉流体力学特性及颗粒分布

摘要 将循环流化床传热技术与锅炉相结合，设计建造了循环流化床锅炉，进行可视化研究。选择水和聚甲醛颗粒作为工作介质。采用电荷耦合装置研究了颗粒加入量、给水流量等操作参数对颗粒流化和分布的影响。结果表明，在适当的给水流速和添加颗粒量下，颗粒可以正常流化和循环。提升管束中的固体滞留量随着给水流速和添加颗粒量的增加而增加。随着给水流速的增加，颗粒分布的不均匀程度降低。与给水流速相比，添加颗粒的数量对颗粒分布的影响较小。水冷壁管中的平均固体滞留量与八字形烟道管中的接近。