The temperature of the ammonia vapor condenser cannot be reduced
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We have just installed a new reducer that has been cleaned (sent to the manufacturer for cleaning), but the temperature still doesn’t drop; the temperature difference with the top is only 0.5°C. The concentrated ammonia solution resulting from the condensation of ammonia vapor contains only 75 g/l of ammonia. We seek advice from experts. Remaining ammonia water: 65; steam: 7.5 tons; top temperature: 101.5°C; ammonia vapor temperature: 101°C. The cooling water flow is at full capacity, and the temperature difference is small; it is estimated that the amount of cooling water used is around 200 cubic meters. The ammonia vapor temperature remains unchanged! !
I have encountered similar situations; the water hardness in the north is high. Check the cooling water pipeline to see if there is severe scaling, and whether the actual flow rate of the cooling water is low
First, check whether the temperature at the cooling water outlet of the reducer is normal; if it is high, it indicates that there is insufficient amount of cooling water. Then, examine the cooling water inlet valve and other aspects related to the water supply
I am not aware of the specific equipment parameters; according to conventional design, the following parameters should apply: Ammonia evaporation tower: Remaining ammonia water: 65 tons per hour； Steam: 11 tons/hour ； Top temperature: 103.5 degrees ； Reducer: Cooling water 300 tons/hour ； Exit temperature: 96.3 degrees.
I did some back-calculations using the parameters you provided, and it seems that there aren’t any major issues from a computational standpoint; it’s just that the reflux ratio is a bit low, so the ammonia concentration will definitely be lower.
Prepare to check whether the baffles are properly installed in the reducer, as well as the conditions regarding scaling and cleaning!
You’re clever, coming here to ask a big shot for help! :handshake
The reducer is clogged; cleaning cannot be thorough, resulting in poor heat exchange efficiency!