In the upper dilute region of the fluidized bed, its pressure is higher than that of the dipleg, while in the lower dilute region of the fluidized bed, its pressure is lower than that of the dipleg.

• 整个颗粒的循环回路压力曲线呈“8”字形分布，上部流化器内的压力高于料腿内的压力，下部流化器内的压力低于料腿内的压力。