What is the reason for the clogging of the ammonia evaporation tray?
Thread Content
Recently, the ammonia distillation tower tray became clogged. The tray was shut down for maintenance and cleaning after two months of operation. The clog appeared again and the operation had to be stopped again for cleaning. Before each blockage, the pressure at the bottom of the ammonia distillation tower begins to rise, and the wastewater indicators begin to exceed the standard. Check that the ammonia water in the upper tower does not contain much oil, and test the impurity content of the tray.: Please give me some advice! ! ! No. Ash content (Ad) Volatile matter (Vdaf) Total sulfur (St, ad) Characteristics/Fixed carbon third-party plant evaporation tray attachment 46.7997.470.121
The expander is leaking or the primary cooler heat exchange tube is leaking.
The initial cooler, final cooler, and ammonia solution were tested and found to have no hardness, and the divider was not leaking.
personal opinion: There are four reasons. 1》The concentrated ammonia water in the ammonia evaporation tower has too many impurities. ； 2》The membrane tube filter is not effective or has leakage. ； 3》The tar mist treatment in the early stage of gas purification was not clean, resulting in a large amount of impurities in the concentrated ammonia water in the ammonia washing system. ； 4》Concentrated ammonia has poor degreasing effect ； Handling opinions: 1》Strengthen preliminary gas purification operations ； 2》Strengthen the inspection and operation of membrane tube filters and oil removers ； 3》Replace with finer grade membrane tubes ； 4》A small plate filter press is added to the concentrated ammonia water process pipeline before entering the ammonia evaporation tower.
Ammonia evaporation wastewater may be mixed with other wastewater, such as desulfurization liquid, etc.
Is there a lot of tar residue on the tray? How do you determine that the tray is blocked? We will run it for about 2 months and clean the tar residue at the bottom of the tower. The tray is still clean.
The resistance of the ammonia evaporation tower increases and the wastewater index exceeds the standard
How much oil does the ammonia water in the upper tower contain? Judging from this, it is estimated that the separation effect of the mechanized clarifier is not good, and the membrane filtration cannot achieve the effect.