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通过实验的方法考察了加压下,平均粒径为137μm、密度为2490 kg·m~(-3)的Geldart B类颗粒在固体通量为183～773 kg·m~(-2)·s~(-1)的高通量循环流化床上升管内的流动特性。结果表明,加压下七升管压降曲线近似线性分布。随着操作压力的增加,上升管底部颗粒浓度先增大后减小,顶部颗粒浓度逐渐增大,密相区的范围也逐渐增大。加压下截面平均颗粒浓度随颗粒循环速率和操作气速的变化和常压相类似,即随颗粒循环速率的增加而增加,随操作气速的增加而降低。
The effects of pressure on the Geldart B type particles with an average particle size of 137μm and a density of 2490 kg · m ~ (-3) were investigated experimentally at a solids flux of 183-773 kg · m -2 · s ~ (-1) high-flux circulating fluidized bed riser. The results show that the pressure drop of the seven-liter pipe under pressure is approximately linear. With the increase of operating pressure, the particle concentration at the bottom of the ascending tube first increases and then decreases, the concentration of the top particles gradually increases, and the range of the dense phase increases gradually. The mean particle concentration under cross-sectional pressure is similar to the change of particle circulation rate and operating gas velocity and atmospheric pressure, that is, increases with the increase of particle circulation rate and decreases with the increase of operating gas velocity.