Ammonia and conductivity levels in the drain water from the desorption tower are above the specified limits
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The 520,000-ton ammonia stripping unit has been in operation for a month; the system is functioning normally. However, the ammonia concentration in the water sent out from the desorption tower is 40 ppm, and the conductivity is 400, both of which exceed the specified limits. The feed concentrations of NH3, Ur, and CO2 to the desorption tower are 6%, 1%, and 3%, respectively. The temperatures, pressures, and flow rates at various points in the desorption tower and hydrolyzer are normal. There is no liquid retention or carryover in the desorption tower. Checks show that none of the heat exchangers in the system are leaking. Texaco gasification – could everyone please help analyze whether there are any other gases in the CO2 stream that could affect the urea system? Are there any other reasons?
Is it due to insufficient design capabilities, or are there deformations in the tray?
Gentlemen, could the heat exchangers related to the desorption-hydrolysis system (such as the surface coolers in the evaporation system) be leaking? ）
Which manufacturer’s analyzer tower is being used? Has it just started operating?/
A spray-type tray is being used; it is said to perform well in terms of efficiency, and it was decided at the higher levels – no one knows exactly which company provided it.
The Ur content in the desorption stream is a bit high; it would be best to reduce it below 0.5
Is the analysis tower an integrated unit of the first and second towers? If so, it may indicate that there is liquid leakage between the first and second towers. In other words, the weld might be incomplete. ’
For users upstairs, if the partition between the first and second desorption towers leaks, the urea content in the waste liquid is likely to be below the specified standard; the analyzed urea level is less than 1 ppm.