介绍了泸天化CO_2气提法尿素装置节能、扩能改造中应用的多项自研工艺技术及设备结构改进技术的详细情况。通过与同类技术的工艺原理、技术参数的比较和运行情况的总结,阐明了本公司所开发技术的成熟可靠性和先进性。 This paper introduces the details of a number of self-developed technology and equipment structure improvement techniques used in the energy-saving and capacity-expansion retrofit of urea plant of Lutianhua CO_2 gas stripping method. Through the comparison of process principle, technical parameters and operating conditions with similar technologies, the mature reliability and advanced technology of the company are clarified.