预蒸馏工艺流程是水溶液全循环法年产４．０万ｔ尿素装置通用设计中的一项主要改进，对于稳定生产、节能降耗及发挥设备的能力起了重要作用，成为小尿素工艺独有的技术特点。但该技术尚存在着有待于完善提高和不断改进的潜力。基于这种想法，我厂对原预蒸馏工艺流程进行了改进，并获得成功。生产实践证明，改造效果明显 The pre-distillation process is a major improvement in the general design of an annual 40,000 t urea plant with the full cycle of aqueous solution. It plays an important role in stabilizing production, saving energy and reducing equipment consumption, and becoming a unique technology for small urea plants Technical characteristics. However, the technology still has the potential to be improved and improved continuously. Based on this idea, I plant the original pre-distillation process has been improved and achieved success. Production practice has proved that the transformation effect is obvious