双循环流化床内稻壳-石英砂混合颗粒循环流率的实验研究与预测  

Experimental Study and Prediction of Particles Circulation Flow Rate of Rice Husk-Quartz Sand Particle Mixture in Dual Circulating Fluidized Bed

作　　者：杨新[1] 麻哲瑞 赵争辉[1] 陈鸿伟[1] YANG Xin;MA Zhe-rui;ZHAO Zheng-hui;CHEN Hong-wei(School of Energy Power and Mechanical Engineering,North China Electric Power University,Baoding,China,Post Code ：071003)

机构地区：[1]华北电力大学能源动力与机械工程学院

出　　处：《热能动力工程》2018年第11期118-123,共6页Journal of Engineering for Thermal Energy and Power

摘　　要：混合颗粒循环流率是气化反应的双循环流化床系统稳定运行的关键。在自行搭建的双循环流化床冷态系统上,对气化室风速、提升管风速、初始物料质量和石英砂粒径等控制参数对不同稻壳质量比的稻壳-石英砂混合颗粒的循环流率的影响进行实验研究。研究表明：混合颗粒循环流率随着气化室和提升管风速的增加而增加;随着初始物料质量的增加,气化室侧返料管压力增加,混合颗粒循环流率增大;随着粒径增加,石英砂颗粒流化困难,循环流率减小;由于稻壳密度小,形状不规则,在一定程度上阻碍物料的流化,因此随着稻壳质量比的增加循环流率下降;基于以上各参数提出经验关联式,预测误差在-18. 04%-19.8%间,能够很好地对双循环流化床系统中稻壳-石英砂双组份物料颗粒的循环流率进行预测。The key to the stable operation of dual circulating fluidized bed is to ensure reasonable circulation flow rate of particles. The effects of the control parameters such as bubbling bed wind speed, riser wind speed, initial material quality and quartz sand size on the circulating flow rate of the binary mixture particles with different rice hull quality ratio were investigated on a self-built dual-circulating fluidized bed cold system. It was found that the circulating flow rate increased with the bubbling bed wind speed and riser wind speed. With the increase of the initial material quality, the pressure on the bubbling bed of the return pipe and the circulation flow rate increased. As particle size was increased, the fluidization of the quartz sand particles was gradually difficult to make and the circulation rate increased. Due to the small density of rice husk and irregular shape, the fluidization of material was hindered by a certain extent, so the circulating flow rate was decreased with the increase of rice husk quality ratio. In addition, the empirical correlation of the above-mentioned control parameters was also proposed and the prediction error was between -18.04% -19.8% ,which could predict the particle circulating flow rate of dual circulating fluidized bed system of quartz sand-rice husk binary particles.

关 键 词：双循环流化床 混合颗粒 循环流率 控制参数 经验关联式 

分 类 号：TK63[动力工程及工程热物理—生物能]