溶液全循环法尿素工艺技术改进

Improvement on urea process technology of solution total recycle

介绍采用提高 CO2 转化率和尿素水解气提技术改进溶液全循环法尿素工艺。采用双钝化技术降低惰气含量 ,调整水碳比 ,以及改进塔盘结构 ,优化合成工艺条件等措施 ,提高 CO2 转化率。根据尿素水解机理 ,设计出边水解、边气提的水解气提技术 ,使解吸废液在较低水解温度、较短停留时间 ,达到理想的水解深度。

This article introduces the improvements made on the urea process of solution total recycle with the incorporation of technologies that improves CO 2 conversion rate and urea hydrolyzing stri pping .In the improvment countermeasures have been taken to raise CO 2 conversion rate such as adoption of bi passivation technology to decrease inerts content,adjustment of vapour/carbon ratio,modification of tray plates structure and optimization of synthesis process conditions.And it designs the technology of stripping following hydrolyzing resulting in an achievement of ideal hydrolysis level by making the decomposition of effluent at a comparatively low hydrolyzing temperature and a shorter residence time.