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双循环流化床提升管床降随着固气质量比的增加而增加。搭建了双循环流化床实验台,系统地分析了提升管送风特性对充分发展段压降的影响规律。结果发现:充分发展段压降随着提升管风速的增加逐渐增大;径向送入二次风产生的压降比风口切向布置时大;风口高度较低时产生的压降较大;随着二次风口数目增加,压降有增加趋势,设置的4种情况下实测压降平均变化率分别为12.28%、2.76%、13.16%和6.96%。建立了提升管充分发展段压降模型,计算发现:实测压降与计算值存在偏差,风口数目影响下二者的偏差较小,平均相对误差仅为3.13%,最大相对误差3.95%,风口高度影响下差距较大,平均相对误差为4.27%,最大相对误差为5.36%。
Double-bed fluidized bed riser bed drop increases with the increase of solid-gas mass ratio. A double-circulating fluidized bed experimental bench was set up to systematically analyze the influence of the riser air supply characteristics on the pressure drop of a fully developed section. The results show that the pressure drop of full development section increases with the increase of the riser air velocity. The pressure drop caused by the secondary air entering radial direction is larger than the tangential arrangement of the tuyere. The pressure drop generated when the tuyere height is low is larger. As the number of secondary tuyeres increases, the pressure drop tends to increase. The average pressure drop measured in the four cases is 12.28%, 2.76%, 13.16% and 6.96% respectively. The model of pressure drop in full development of riser was established. The calculation shows that the measured pressure drop has a deviation from the calculated value, and the deviation of the two is small with the average relative error of 3.13% and the maximum relative error of 3.95% Under the influence of a large gap between the average relative error of 4.27%, the maximum relative error of 5.36%.