Circulating water system

Approaching 19°C? Is there any change compared to the previous near-temperature level?

Approaching 19°C? The temperature of the return water in the cycle remains relatively constant, around 2-3°C. The main issue is that with the 4-stage compression process in the reciprocating compressor, the temperature doesn’t drop; the temperature at the exit of stage 1 is high, which in turn causes the temperatures of all 4 stages to be high as well. It’s not just one piece of equipment that has this problem – several pieces are affected.

Turn down the return valve a bit; too low a return pressure can also result in poor heat exchange efficiency

If you control the return water pressure, isn’t that controlling the flow rate? Wouldn’t that mean the temperature would be even higher? Has the circulating water system been connected to heat exchange equipment at a \"relatively lower elevation\" again?

Based on the information provided by the poster, given that the pressure difference between the inlet and outlet water was so high last time, and assuming that there are no issues with the system’s design, if it is caused by the inability to reduce the temperature of the air exiting the heat exchanger or by problems with the control valves in the workshop, then, considering the inlet and outlet water temperatures you mentioned, it is possible that there is a problem with the heat exchanger itself, which is not capable of meeting the required specifications.

{:3_49:} Check the pressure difference between the inlet and outlet of the heat exchanger, as well as the inlet pressure; this can indirectly help determine the difference in flow rate of the heat exchanger compared to before. If other equipment takes up too much of the circulating water, less water reaches the compressor, and heat exchange will definitely be poor. Low outlet pressure is merely a symptom of poor heat exchange efficiency, not the cause. Another factor is the selection of your heat exchanger; if it worked fine before, then there’s no problem. Also, when performing inspections and repairs, ask the operators which parts they have touched. If that doesn’t work, disassemble the key areas that were touched for inspection. In many cases, there are no serious problems with the equipment during inspections and repairs; it’s usually the operators’ carelessness that causes issues, either due to incorrect installation or blockages in the pipelines

To adjust the temperature of the circulating water, adjust the outlet valve of the heat exchanger; keep all the water supply and return valves open, and close the bypass valve. In winter, keep the bypass valve slightly open in order to adjust the heat exchange temperature through the temperature of the water passing through the heat exchanger

Based on your description, it seems that the heat exchange area is insufficient; the temperature rise of the cooling water is only 3 degrees, which indicates a large temperature difference for heat transfer on the process side. Conduct a heat balance calculation to see if the heat exchange area is indeed inadequate

If the heat exchange capacity is insufficient, installing a water cooler or increasing the water flow can help reduce the temperature. 48-55℃ is also considered close to normal temperature; I don’t think there’s any problem with this value, and it might be possible to increase the cooling at the compressor