尿素产品的统计过程控制研究

A Study on Statistical Process Control of Urea

本文以浙江巨化集团公司为研究对象,将统计过程控制方法应用于该公司的尿素生产过程中。针对尿素产品的缩二脲含量和水份含量,分别绘制均值——极差控制图,并计算过程能力指数。在此基础上,进一步给出优化的均值——极差控制图。研究结果表明,缩二脲含量和水份含量在生产过程中处于失控状态,并且过程能力较弱。这说明尿素生产过程处于不稳定状态,则管理人员需要予以重视。

The paper studies how to apply the statistical process control (SPC) to the urea production process in the Zhejiang Juhua Group Corporation.For the contents of biuret and water in the urea product,two-R control charts are respectively made,and two process capability indices are respectively computed.Furthermore,an improved-R control chart is developed.The results investigated show that the contents of biuret and water in production process are out of control,and the process capabilities of them are weak,which reflects the instability of urea production process,and it needs the utmost attention of the management.