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首页> 外文期刊>Advanced Powder Technology: The internation Journal of the Society of Powder Technology, Japan >Elimination of stagnant particles from a N-valve with side aeration in circulating fluidized bed
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Elimination of stagnant particles from a N-valve with side aeration in circulating fluidized bed

机译：循环流化床中带有侧曝气的N型阀消除了滞留颗粒

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摘要

The existence of stagnant particle layer in the conventional non-mechanical valves limits their utilization in CFB with the feedstock of caking particles. A new N-valve consisted of a fluidized weir chamber with bottom aeration and a moving-bed angled standpipe with side aeration was developed to eliminate the stagnant particle layer and reach high solids circulation rate G_s in CFBs. The particle flow behavior and its control in the N-valve were studied experimentally. By combining the bottom aeration for weir chamber and the side aeration for angled standpipe the G_s over 270 kg/(m~2 s) was achieved, and the stagnant particle layer completely disappeared. The G_s increased with increasing the side aeration gas flow rate Q_(sa), and this loosing gas flow was optimally injected from the bend between the downcomer and the angled standpipe. At a constant but enough high Q_(sa), the increase in the bottom aeration gas flow rate Q_(ba) elevated G_s linearly.
机译：常规的非机械阀中存在停滞的颗粒层，这限制了它们在结块颗粒原料中在CFB中的利用。开发了一种新的N阀，该阀由带底部曝气的流化堰室和带侧面曝气的移动床角立管组成，以消除积炭颗粒层并在CFB中达到较高的固体循环率G_s。实验研究了N阀中的颗粒流动行为及其控制。通过将堰室的底部通气和倾斜的立管的侧通气相结合，G_s超过270 kg /（m〜2 s），并且停滞的颗粒层完全消失了。 G_s随着侧通气流量Q_（sa）的增加而增加，并且这种松散的气流从下降管和成角度的竖管之间的弯曲处最佳地注入。在恒定但足够高的Q_（sa）下，底部曝气流量Q_（ba）的增加线性地增加了G_s。

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