The causes behind breakage of the catalyst are excessive sodium and vanadium content in the feed oil, excessively high regeneration temperature and excessively high steam velocity in riser pipe.
对催化剂的分析表明，催化剂破碎主要由于原料中钠、钒含量超标、再生温度过高和提升管预提蒸汽线速过高所致。
Induced by the high-speed feed jet flow, the solid particles above the feed nozzle tended to flow down, and a reverse flow zone was formed along the riser wall.
受喷嘴区高速射流的影响，喷嘴上方固体颗粒呈向下流动趋势，形成一个诱导回流区域。
The technology is equipped with a catalyst mixer at the bottom of the riser, which can produce an ideal circular flow of catalyst before the catalyst contacts with the feed oil.
该技术在提升管底部设置催化剂混合器，使催化剂在与原料油接触之前形成理想的环状流。
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