Cause analysis and countermeasures for increasing water content of lean methanol in low-temperature methanol washing system of synthetic ammonia unit
In response to the abnormal increase(up to 2.6％)in the water content of lean methanol(mass fraction,the same below)in the low-temper-ature methanol washing system of the 300 kt/a syn-thetic ammonia unit of Jilin Petrochemical Company of PetroChina after the process transformation of the newly added synthetic gas purification system,which exceeded the design index value(1.5％)and had to be operated at reduced-load,the relevant influenc-ing factors were analyzed and investigated,and the reasons leading to the blockage of the sieve holes of the methanol/water separation tower tray were ana-lyzed,then the corresponding process optimization measures were implemented.The results showed that after the implementation of process optimization measures,the separation effect of methanol/water separation from the tower was significantly improved.Not only did it increase the load rate of the low-tem-perature methanol washing system from 82％to 100％,but also reduced the water content of lean methanol to 0.4％.
synthetic ammonia unitlow tempera-ture methanol washing systemmethanol/water sepa-rationthe mass fraction of water in lean methanolabnormally increasetray blockageoptimization measures
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