【作者】 韩莉果；

【导师】 张少峰；

【作者基本信息】 河北工业大学 ， 化工过程机械， 2004， 硕士

【摘要】 本文设计并安装了一套用于换热和防除垢的液固流化床换热器，并运用CCD图象采集与处理系统对分布板的设计进行了实验研究，讨论了分布板结构以及各种操作条件对管束中颗粒的速率、固含率分布的影响。利用Matlab语言实现了实验结果的可视化。实验结果表明：在液固循环流化床进口段安装可调节高度的变孔径分布板，能在较高的流速下，较好的改善固体颗粒在管束中的不均匀分布；开孔率越小固体颗粒在管束中的分布越均匀，但管束中粒子的平均固含率也越小；分布板的安装高度对颗粒的分布有很大的影响，在实验范围内分布板的安装距离管束入口处越远，颗粒在管束中的分布越均匀。所以应根据不同的操作条件选择合适的变孔径分布板，以得到较均匀的粒子分布。根据实验结果建立了固含率与固相速度不均匀度的关联式，并根据颗粒离散模型建立了颗粒速度分布模型，实验结果和计算结果吻合较好。更多还原

【Abstract】 A solid-liquid fluidized bed has been designed and installed ,which will be used in the heat exchanging and descale field .The experimental study for distributor design was carried out and the particles distribution in the tubes of the solid-liquid fluidized bed under different operating conditions was studied by using the CCD measure system .Experimental results show that heterogeneous pores distributor which was arranged in the inlet chamber of the solid-liquid fluidized bed can improve the nonuniform distribution of particles in the pipe bundle under high flow rate . The nonuniform decreases by decreasing the mount of pore, but the solid holdup decreases too. The particles distribution is influenced by the position of the heterogeneous pores distributor. The nonuniform of distribution decreases with the increase of the distance between distributor and the tubes inlet in operating range. So based on the given operating range, the reasonable pore rate and position of heterogeneous pores distributor can be determined to obtain the distribution of particles as homogeneous as possible. According to the experimental result ,the relevancy formulae were proposed, and according to discrete particle model, particle velocity distribution model was proposed and the experimental result agreed with the calculated result.更多还原