摘要
烯烃聚合流化床反应器近分布板区域的动结块是分布板堵塞的诱因,严重影响流化床的正常操作,甚至引发事故。本文在冷模实验装置中,使用声发射技术对近分布板区域的动结块进行检测,分别对比了正常流化、加入丝状结块和加入块状结块时近分布板区域声信号能量和频谱的差异。实验发现,与正常流化时相比,加入结块使得声信号能量下降,且加入块状结块时声信号能量下降更为显著;加入结块后声信号频谱的低频部分（0~20 kHz）和高频部分（70~150 kHz）均出现不同程度的降低,且高频部分下降比低频部分更为显著,块状结块导致的下降比丝状结块更为显著。实验结果表明,声发射技术可以用于流化床反应器内近分布板区域动结块的检测。
The active agglomeration near the distributor in tluidized bed reactors for olefine polymerization is thought to be the main inducement of the distributor blockage. It would significantly impact fluidized bed reactor operation, even cause an accident. In this paper, acoustic emission （AE） technology was used to measure active agglomeration near the distributor in a cold model experimental apparatus. The energy and power spectrum of AE signals in three cases were compared, including normal fluidization, adding filamentous agglomerations, and adding massive agglomerations. Compared to normal fluidization, AE energy was reduced after agglomerations were added to the fluidized bed. And AE energy decreased more apparently after the addition of massive agglomerations. Similarly, the low frequency part （0-20 kHz） and high frequency part （70-150 kHz） of the AE signals decreased when there were agglomerations. The decrease in high frequency part was more apparently than that in low frequency part. And the decline caused by massive agglomerations was more pronounced than that caused by filamentous agglomerations. These results showed that AE technology could be used to the active agglomeration near the distributor in fluidized bed reactors.
出处
《浙江化工》
CAS
2014年第2期23-26,共4页
Zhejiang Chemical Industry
关键词
烯烃聚合
流化床
动结块
声发射
olefine polymerization
fluidized bed
active agglomeration
acoustic emission
