30万t/a合成氨装置(布朗流程)氨回收系统的改造与运行

Reformation and Operation of Ammonia Recovery System in Synthetic Ammonia Plant(Brown Process) with a Capacity of 30×104 t/a

简述了锦西天然气化工有限公司30万t/a合成氨装置（美国布朗流程）氨回收系统的工艺流程;介绍了氨回收系统存在的问题以及历次技改的情况。针对氨吸收能力差这一主要问题,实施了更换氨吸收塔内件的技术改造。技改效果表明：①氨吸收塔可在弛放气量5 200~10 000 m3/h的高负荷下运行,提高了系统的操作弹性;②出塔气体达到氨含量〈1 000×10-6的排放要求;③出塔气体无液体夹带;④因增加负荷可创经济效益355万元/a;⑤改善了现场环境。

Author has briefly described the process flow for the ammonia recovery system of synthetic ammonia plant（American Brown process） with a capacity of 30×104 t/a in the Jinxi Natural Gas Chemical-Engineering Company Ltd.;has introduced the existing problems of the ammonia recovery system and the technical reformation situation in all previous times.In allusion to this main problem that absorption capacity of ammonia absorber was poor,technical reformation of replacing the absorber internal was executed.Technical effect indicates that：（1） Ammonia absorber can operate under high load with a releasing gas quantity of 5200~10000 m3/h,the operative flexibility of system is increased;（2） Gas out of absorber can reach emission requirement of ammonia content less than 1000×10-6;（3）No entrainment of liquid in the gas out of absorber;（4） It can create economic benefitof 355×104 Yuan RMB/a due to addition of load;（5） It can improve the siteenvironment.