中文摘要：

以循环流化床输送斜管为研究对象,通过改变颗粒质量流率,测量斜管内蝶阀上、下两处的动态压力。结果表明,随着颗粒质量流率增加,蝶阀上、下方颗粒的流动形式均发生变化,斜管内的颗粒流态发生变化,动态压力的波动幅度逐渐增加。蝶阀下方的动态压力标准偏差与颗粒质量流率呈线性关系,能够用于表征循环流化床的颗粒质量流率。压力脉动的小波分析表明,斜管内蝶阀上、下方均存在一个主频,是由于斜管自身的流动结构所致,但蝶阀下方还存在一个次频,是由于气体脉动以及气、固两相的相互作用所致,且次频所占能量随颗粒质量流率增加而降低。斜管下料产生的脉动压力是一种低频压力,是斜管振动的激振源。

英文摘要：

In large circulating fluidized bed device, the characteristics of pressure fluctuation in a particle-transport inclined standpipe under different solid circulating flux were investigated based on measuring the dynamic pressure of a gas-solid two-phase flow by using FCC equilibrium catalyst as the particles. The experimental results showed that with increase of particle mass flux, the flow patterns of FCC particles above and below the butterfly valve in the inclined standpipe both successively changed, and the fluctuation amplitude of dynamic pressures increased. The standard deviation of the dynamic pressures below the butterfly valve possessed a linear relation with the particle mass flux, which could be used to characterize the particle mass flux in the inclined standpipe. By wavelet analysis, it is indicated that there existed a main frequency caused by inclined standpipe flow structures in the pressure fluctuations above and below the butterfly valve, besides, there was a secondary frequency in the pressure fluctuation below the butterfly valve caused by gas turbulence and gas-solid interactions. With the increase of particle mass flux, the wavelet energy ratio of the secondary frequency gradually decreased. The fluctuation pressures caused by discharge in the inclined standpipe is a low frequency pressure and the excitation source of inclined standpipe vibration. ? 2016, Science Press. All right reserved.