The cooler fails to lower the temperature
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The ammonia cooler in the unit fails to reduce the temperature; the fluid flowing inside the tubes is circulating water, while the fluid flowing outside the tubes is ammonia. Circulating water is used to cool the ammonia. Recently, the temperature of the ammonia exiting the cooler has been on the high side. Does anyone have any methods to lower this temperature (without shutting down the operation, as the cooler cannot be removed)? Thank you, extra points!
Just swap the shell side and the tube side
First, explain how to swap it while using it now, and then discuss how to replace the pipeline
In the past, ammonia cooling involved compression and pressurization; if circulating water cooling was not effective, it indicated either increased dirt on the equipment or rising temperatures. If operations had to continue, it is recommended to use water spraying on the equipment and its inlet and outlet pipelines to remove heat, which can help to some extent
Provided that there is no shutdown and the cooler is not removed
Ammonia water flows in the tube side, while cooling water flows in the shell side
Has there been any change in the temperature of the ammonia solution entering the cooler? Reduce the ammonia flow rate, vent from the high point of the cooler, increase the cooling water flow rate, and contact the power department to lower the cooling water temperature.
There isn’t enough information; many factors can only be guessed, so the answers will inevitably be chaotic and it will be difficult to obtain anything useful. Why doesn’t the temperature drop? Increase in material quantity? Rising temperatures? Scaling on the heat exchange surface? Is it still the lack of condensable gas that leads to a reduction in the heat exchange area? Has even the temperature detection changed?
Increase the pressure in the circulating water system, check for air on the circulating water side of the heat exchanger, make use of the cooler at its maximum efficiency; if it is not possible to shut down the system, cooling can be achieved by spraying water on the pipes or removing some of the pipe insulation