Urea desorption liquid
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The phenomenon of urea desorption liquid flooding and how to deal with it?
Is there deep hydrolysis on the 1st floor? Are the desorption tower internals packing or trays?
There is deep hydrolysis, and the internal parts of the desorption tower are trays. Thank you.
The liquid level is too high, the steam flow rate is large, the amount of steam added is large, and the pressure difference between the steam and the back pressure of the desorption tower is too large.； The condensate load of the analytical process is too much higher than the design value, and the analytical tower tray is dirty, blocked, or damaged.
If the internal parts of the desorption tower are a float valve tower or a sieve plate tower, it may be caused by the dirty process condensate clogging the tray and causing liquid flooding.； If the desorption load exceeds the original design by 10% or the ammonia content in the process condensate exceeds the original design, it may also cause the desorption tower to flood. As far as I know, there are many 520,000-ton urea plants in China that have modified the desorption tower trays and only replaced the trays, which has achieved the expected results. What is the production capacity on the first floor? What is the hydrolysis desorption process used?
The added amount of analytical solution is too much, the liquid level is high, and the added amount of steam is large.
Analyze the phenomenon of tower liquid flooding: The outlet gas temperature of the analytical tower rises, the pressure of the low-pressure system drops, the liquid level of the ammonium bicarbonate tank rises rapidly, and the temperature of the outlet liquid of the analytical tower drops, resulting in wastewater discharge exceeding the standard and making it difficult to maintain the system water balance. Causes of flooding: Analysis load is too fast ； Steam adjustment range is too large ； Severe scaling of trays ； Tray blowing or tilting causes partial liquid ； The liquid level is too high and the gas phase contains liquid ； Sudden pressure drop in low pressure system ； Parse and low pressure too fast ； The ammonia or urea concentration of the process condensate is too high. deal with: Based on the above reasons, search and solve them one by one. This post was last edited by hnmhzhc on 2009-4-16 11:05 ]