摘要
利用声发射检测技术,根据颗粒运动碰撞壁面产生声波的机理以及声波信号随流化床高的规律性变化,发现“北星双峰”工艺的气相釜为带有滞留区的双循环流动模式。试验同时发现,扩大段部位声能量最小处或声信号能量及声信号均方差均达到最大处为料位,由此获得了一种简易快捷、安全环保的料位检测技术,为装置的“安稳长满优”运行提供了保障。
The flow pattern of the gas - solid fluidized bed in Borstar process was experimental measured by a novel Acoustic Emission （AE） technique according to the mechanism of collision between the particles and the wall. And the flow pattern of polyethylene particles of the fluidized bed in Boratar process was multi - circulation pattern, in which there were main - circulation zone, sub - circulation zone and stagnant zone. At the same time,the bed level of a gas - solid fluidized bed was experimentally investigated by this acoustic emission technique. The AE energy and the mean square deviation of the AE signals were found to be maximum at the height of bed level during the fluidization of polyethylene particles. Therefore, the bed level could be got by this found. So a novel AE approach to measure the bed level in the gas - solid fluidized bed can be developed to judge the bed level precisely and it can replace the γ-ray in future.
出处
《石油化工技术经济》
2007年第3期13-15,共3页
Techno-Economics in Petrochemicals
关键词
声发射
气固流化床
流型
料位高度
聚乙烯
acoustic emission, gas - solid fluidized beds, flow pattern, bed level, polyethylene
