Solutions for treating non-condensable gases as ammonia
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:(Gentle experts, the vacuum pump in our MVR system extracts ammonia (85%) and water vapor (15%). Currently, the ammonia emissions do not meet the required standards, and the client wants this issue to be resolved by converting it into 10% ammonia solution for reuse. I’m not familiar with this process, so I hope you can provide some guidance. Thank you in advance.) Basic parameters: Ammonia overflow volume is about 5 kilograms, ammonia temperature is 58°, and the pressure within the system is -0.08 Mpa. Could we build a simple water absorption tower? Please give me some guidance. Thank you.
Sure, we can build a water absorption tower; two stages of absorption might be necessary. A simulation calculation will suffice, and this shouldn’t be difficult.
10% ammonia solution is sufficient for primary absorption; the design and selection of the absorption tower are crucial.
Well, does the senior have any information on absorption towers? I’m really confused right now
The ammonia leakage amount is about 5 kilograms; what is the time unit?
6 tons of water evaporate per hour, with 10 tons of feed being used; each ton of feed contains 5 kilograms of 99.9% ammonia solution. Therefore, the overflow volume per hour should be 50 kilograms.
Dilute, condense, and consult the saturated concentration table based on the condensation temperature
Thanks. I’ll just go with a spray tower; the volume to be treated is so small – actually, only 500 liters of ammonia per hour.
Ammonia is a foul-smelling gas; even after it is absorbed to form ammonia water, it remains volatile. A small amount of it escaping into the environment can result in a strong odor, which can easily lead to complaints from workers at nearby factories and other entities, as well as orders for corrective action and penalties from environmental monitoring authorities. Therefore, it is recommended to use secondary absorption for greater safety.
It is possible to use a spray tower for absorption, but what was said on the 10th floor is correct: you need to take into account that ammonia is a highly toxic and corrosive gas, so it is necessary to handle the small amount of exhaust gas that remains and recycle it (in fact, low-concentration ammonia water obtained through secondary recovery can be reused in the primary tower) to ensure no environmental issues arise. Thank you!