On the basis of the experiments, a mathematical model was established to predict solid circulating rate.
在试验基础上，建立了颗粒通过水平孔口的物料循环模型，可很好预测颗粒通过孔口的流动。
The results show that the principle of re-circulating rate does not change compared to conventional CFB.
结果表明：在双级料腿循环流化床中，与常规的循环流化床相比，循环流率的规律没有发生变化。
The negative pressure gradient and slip velocity in standpipe increase with the increase of circulating rate.
随着循环量的增大，立管内的负压差梯度及气固相对速度也随之增大；
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