Ammonia refining tower temperature control
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The temperature of the ammonia purification tower is controlled by the amount of liquid ammonia fed into the tower; the heat is absorbed during the vaporization of the liquid ammonia. If the tower temperature does not drop, it means that too much liquid ammonia is being fed in, and this will cause the liquid level in the tower to rise. How can the feed rate be balanced? In my facility, insulation for the temperature control points in the purification tower has not yet been installed, which results in some deviation from the actual temperature. A DCS system is available; clicking on the image will enlarge it, making it clearer.
What are the key points for the regular operation of ammonia purification towers and compressors? I would appreciate some guidance from the experts.
It is recommended not to set this control valve in automatic mode; instead, the valve opening should be adjusted based on temperature, which will help maintain a stable ammonia injection rate.
Auto mode isn’t even activated; the target temperature is between minus 10 degrees and zero degrees, but the current temperature is around 7 degrees. To lower the temperature, more liquid ammonia needs to be added, which in turn raises the liquid level in the tower, creating a vicious cycle.
When the liquid level rises, it is pumped into the sewage tank. Should the insulation effect be taken into consideration?
The rising liquid level may be due to crude ammonia carrying liquid. Recommendation 1: Reduce the temperature of crude ammonia gas entering the tower. 2. A degasification tank is installed before the crude ammonia gas enters the tower.
Reduce the temperature by three degrees. Additionally, the ammonia purification tower requires waste discharge, as crystalline deposits form when crude ammonia gas reacts with liquid ammonia inside the tower; if waste is not discharged over time, blockages will occur. I also want to ask if there have been any cases of valve shutters corroding in your facility