水溶液全循环法尿素装置配套联产三聚氰胺技术改造  

Retrofit of water solution total recycle urea production unit for coproduction of melamine

作　　者：崔国星[1] 

机构地区：[1]三明学院资源与化工学院,福建三明365004

出　　处：《现代化工》2013年第9期109-114,共6页Modern Chemical Industry

基　　金：福建省科技计划重大项目(2010H6020);福建省科技计划项目(2010H2006)

摘　　要：水溶液全循环法尿素装置为配套联产三聚氰胺,需消化吸收三聚氰胺装置副产的尾气,打破了尿素装置原有生产的水平衡,导致系统水碳比高、存在尿素合成塔处理能力不足,需提高生产能力的问题。从尿素合成转化率、系统热平衡等方面分析了该尿素装置的处理能力,提出解决水平衡的办法。通过双尿素合成塔并联操作,提高尿素合成转化率,中压系统分解、吸收能力的改造等措施,解决了上述问题。结果表明,改造后顺利实现尿素与三聚氰胺联产,尿素装置在高水碳摩尔比下生产运行良好,消化吸收了46 t/d三聚氰胺装置来的全部的甲铵液,装置生产能力达到750 t/d,尿素消耗降低,氨耗等与CO2汽提法尿素工艺相当。To coproduce melamine with water solution total recycle urea production unit,the off-gas from melamine unit is needed to be absorbed,which breaks the water balance,and leads to the high mole ratio of water to carbon and deficient capacity of urea converter.To solve water balance and elevate capacity,the approaches are proposed by analyzing the capacity of urea unit from aspects such as CO2 conversion and heat balance of urea synthesis system,and retrofitting the parallel operation of dual urea synthesis column,medium and low pressure system in urea unit.The results show that coproduction is realized between urea unit and melamine unit successfully.Urea unit is run smoothly in high mole ratio of water to carbon condition.Carbamate solution from 46 t/d melamine unit is completely absorbed.The capacity of urea unit is raised to 750 t/d urea.The consumption of ammonia and steam is lowered,equivalent to CO2 stripping urea process.

关 键 词：水溶液全循环法 尿素装置 水碳摩尔比 甲铵液 三聚氰胺 

分 类 号：TQ441.41[化学工程—化学肥料工业]