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介绍了化工部化工机械研究院开发的专用于清除尿素装置难溶垢的Lan257C清洗方法及该方法在部分中型尿素装置上的应用情况。应用结果表明，Lan257C化学清洗法是清除尿素装置污垢的有效方法。
This paper introduced the Lan257C cleaning method developed by the Chemical Machinery Research Institute of Ministry of Chemical Industry to remove the hard-to-remove scale of urea plant and the application of the method to some medium-sized urea plants. The application results show that Lan257C chemical cleaning method is an effective method to remove the fouling of urea plant.