乙烯干燥器瓷球结块原因分析及对策

Analysis and countermeasure for agglomeration of alumina balls in ethylene dryer

对Un ipol气相流化床工艺中原料精制床层耐火瓷球出现结块现象进行了理论分析。结果表明,干燥器的耐火瓷球耐高温风冷能力有限,多次高温再生后表面裂化,在再生吹扫过程造成乙烯滞留,经热作用生成高分子聚合物,最终导致催化剂床层结块。由此提出了如下解决方案:采用A l2O3质量分数达65%的高温耐火瓷球,将干燥器改为串联操作,延长冷吹、热吹时间各5 h。经过工业应用表明。

The reasons of the agglomeration of the alumina balls in the ethylene dryer in the Unipol gas phase fluid bed process were analyzed.It was the reason that the alumina balls were cracked after several high temperature regenerations,it was difficult to blow off the ethylene and the ethylene delayed in the cracked alumina balls polymerized easily in regeneration temperature,the polymer connect with the alumina balls to form a big agglomeration.So the countermeasures were proposed that alumina balls consist of more than(65%)(alumina) were used during process operation two ethylene dryers using serial instead of one use and one delay,elongating the blow time in the regenation.