Water cooling tower overflow issue
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When the molecular sieve adjusts pressure, the amount of nitrogen and contaminated nitrogen entering the water cooling tower increases, resulting in high pressure and significant overflow of chilled water. Have any of you experts encountered such a problem? How was it solved?
Is your chilled water in a closed-loop system? During the pressure increase and decrease process of the molecular sieve, fluctuations in the outlet pressure and flow rate of the air compressor occur, which lead to pressure fluctuations within the air cooling tower. Freezing water overflow occurs when the liquid level is too high, causing an overflow. If the pressure inside the water cooling tower is high, the liquid level should be low – so how can there be an overflow?
The water cooling tower is open – how can the pressure in it increase?
Check if the cold water flow rate in the water cooling tower has increased Has only the water volume in the air-cooling tower decreased? 、。 . . . .
When the amount of nitrogen flowing to the water cooling tower increases, the pressure on the water surface should rise due to the flow resistance associated with the packing; once this pressure reaches a certain level, the water overflows through the overflow outlet
If possible, first, gradually increase the amount of nitrogen contaminants in the molecular sieve to ensure that the amount of such contaminants reaching the water cooling tower does not exceed the allowed limit; second, identify the patterns and vent the system in advance~~
Our air-cooled towers operate on an open-loop cycle. We do not encounter the issue mentioned by the poster here, but the liquid level in our air-cooled towers does fluctuate. Pressure changes have a significant impact on the amount of water returning to the system; delayed operation of valves can lead to fluctuations in the liquid level. Additionally, these changes also affect the flow rates of the chilled water and cooling water used in the towers
I’m not sure what your process is, but ours involves regenerating gas and venting it during the switchover. When switching, there is a manual control valve behind the dump valve; you can manually set it to the pressure required for regeneration. Therefore, the impact on the water-cooled tower and the air-cooled tower during switching is sometimes particularly significant.
There are automatic valves available, right? They allow for adjusting the various parameters of the PID control – it seems to involve adjusting the I and D values to slow down the operation of the valve; in other words, the molecular sieve valve opens too quickly, and the other valves can’t keep up! ! !
I have encountered situations where the water cooling tower overflows, due to fluctuations in the liquid level gauge of the tower during winter, as well as changes in the air flow rate through the tower during the switching of molecular sieves
The airflow holds back the water, causing false overflow; this reduces the amount of excess nitrogen or nitrogen gas