Ammonia evaporation problems in coking plants
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The ammonia flow rate in our coking plant is around 30. We are using an old-style ammonia distillation tower made of cast iron. At present, the ammonia nitrogen level in the wastewater after ammonia distillation is around 1500; the temperature at the top of the tower is 100 degrees, and the temperature at the bottom is 102 degrees – these values cannot be reduced. What could be the reason for this? I would be very grateful if any experts could provide some good suggestions!
How old is the tower? Check the trays.
The tray is clogged; it is recommended to replace it with a slotted tray
It’s likely the tray is blocked; open the manhole to check it.
With the current market conditions this year, I still want to replace the tower tray; I really intend to do that – it’s impossible not to
Negative-pressure ammonia evaporation saves energy while meeting standards.
No explanation was given regarding the tower’s structure. What is the rated treatment capacity at an ammonia flow rate of around 30? What is the steam ratio? What are the pressures at the top and bottom of the tower? It is recommended to increase the steam ratio and raise the temperature at the top of the tower by 2 degrees, then analyze the wastewater data.
If there is no problem with the tray, switch to a condensing cooler and forced reflux
The temperature at the top of the tower must not exceed 98 degrees; otherwise, some ammonium salts will evaporate, leading to crystallization blockages
I would like to ask: we want to switch to a bubble column. Is a bubble column better or an inclined-hole column? How do they compare in terms of investment, energy consumption, and efficiency?
Slant-hole trays require less investment, consume less energy, and are more efficient than bubble towers