核料位计在聚丙烯反应器中的应用

Application of Nuclear Level Instrument in Polypropylene Reactor

气相搅拌法生产聚丙烯的工艺流程中,常采用核料位计对反应器料位进行非接触式测量。针对实际测量中误差较大的问题,基于核料位计的测量原理,描述了气相搅拌法生产聚丙烯的工艺流程及反应器的料位控制方案;着重分析了影响料位准确测量的因素;利用公式推导出料位密度补偿算法,提出了三种减小或消除测量误差的方法。经工程实践证明,这些方法是可靠有效的。

The nuclear level instrument is widely used in non-contact measurement in the process of polypropylene adopting gas phase stirring method. Regarding to the bigger error in practice, based on measuring principle of nuclear level instrument metering, the process of polypropylene using gas phase stirring mode and the control scheme of the reactor level are described briefly. The factors affecting the level measurement accuracy are stressed. Density compensation algorithm is developed with formula. Three methods to reduce the measurement error are proposed. These methods are proved effective in practice.