介绍了环件轧制的原理、分类，环件轧制的设备及其主要参数。阐述了国内外环件轧制技术的研究情况以及环件轧制在国内的应用。
Principle, sorting, equipment and main parameters of ring rolling technology have been introduced, and research on such technique both overseas and domestic and application domestic been expounded.
外环的设计则引入自校正控制器——零极点配置控制器（含实时参数辨识）。
The outer loop's design is to use a self tunning regulator such as zero pole placement (with real time identification).
浆液循环速度是外环流浆态床反应器研究中一个重要的流体力学参数，对流体的流动行为和相间传质有重要的影响。
Liquid circulation rate and gas holdup in an air-lift loop reactor were experimentally investigated as changing with the superficial gas velocity for the system of air-water.
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