What are the effects of replacing the original packing tower in the urea decompression tower with trays?
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Our factory uses the carbon dioxide stripping method to produce urea. The original stripping tower was equipped with 24.8 cubic meters of stainless steel packing in a tortoise-shaped design; now we need to remove that packing and replace it with 57 layers of trays. The diameter of the tower is 1400 mm, and its height is 32,000 mm. The liquid retention height for each layer of trays is 150 mm. Which setup, packing or trays, allows for more liquid retention within the tower? How much can it differ?
Most packed towers have a lower liquid holdup than tray towers.
2# I know that, but by how much exactly, and how is it calculated?
Replacement requires calculation, as there is a large amount of liquid retained inside the tower tray.
It was designed by the design institute, but no calculations related to tray replacement were found; only calculations regarding the required levels of urea and ammonia in the solution are present
Let’s compare first with a 5% liquid holding capacity.