Possible reasons for poor heat exchanger performance
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The heat exchanger of the unit has been performing well up to now, but recently its heat exchange capacity has become significantly insufficient. Please analyze what could be the reason
If the heat exchanger has no leaks, it is likely that severe scaling on the heat exchanger is affecting its heat exchange efficiency.
One additional point: there is a gas phase space inside the heat exchanger, which reduces the heat exchange area.
The heat exchanger of the unit has been performing well up to now, but recently its heat exchange capacity has become significantly insufficient. Please analyze what could be the reason Supplemental issues, blockage of channels by material impurities, internal leakage, structural defects on the wall surface, and detachment of the valve discs in the inlet/outlet material valves, etc. Additionally, please refine the question by specifying which type of device’s heat exchanger it is, as well as the fluids on both sides of the vessel wall and their states. To help you resolve issues more easily. For reference
The heat exchanger is a shell-and-tube type heat exchanger; the fluid flowing through the shell side is the material, which is a relatively clean aqueous solution； The circulating cooling water is used as the tube side fluid; there is no significant change in the inlet temperature of the cooling water, while its outlet temperature decreases. The problem is likely to be inside the heat exchanger.
1. The heat exchanger is severely scaled, which affects its heat exchange efficiency. 2. Impurities block the channels; clean the plate exchanger.
If the outlet temperature of the cooling water decreases, it is first necessary to determine whether there has been any change in the flow rate of the cooling water Have there been any changes in the temperature and flow rate of the hot fluid? If nothing changes, then the problem might lie with the heat exchanger; ls has already explained it in some detail
1. It is likely that scaling has formed on the inner wall of the heat exchange tubes in the heat exchanger, and cleaning is required. 2. The circulating water becomes blocked in the pipe layers, causing some of the heat exchange tubes to become clogged and thus affecting the heat exchange efficiency.
Based on the situation described by the poster, it is only possible that there is a leak in the heat exchanger tube bundle, causing the cold and hot fluids to mix together and resulting in a decrease in the temperature at the cold fluid outlet.
The analysis on the 7th floor is quite reasonable. There is just one question: generally, for the inlet of the circulating cooling water in such devices, there is only a pressure gauge, while at the outlet there is only a temperature gauge – no other instruments are present. How can it be determined whether there are any changes in the amount of circulating cooling water flowing in? Also, if there is no flow meter for the flow rate of the process liquid medium, how can it be determined?
It is estimated that this is caused by the following reasons: 1. Scaling is quite severe on the inner and outer walls of the heat exchange tubes; although the scale layer is thin, it still results in a significant increase in the heat transfer resistance. 2. The flow rate of the cooling medium has decreased
There are many reasons for the decline in the heat exchange efficiency of the heat exchanger, and the people above have explained them quite clearly. I think it’s necessary to inspect the heat exchanger: 1. Determine where this heat exchanger is used, what kind of fluids flow through it, the properties of those fluids, and how they affect the pipelines. 2. Find out whether the problem is caused by leakage, blockage, or some issue with the instruments, etc.! (It is usually caused by blockages.) 3. I hope it can be identified and resolved once found!
It’s more likely to be scaling!
Possible reasons include the following; this list is not necessarily exhaustive: 1. Scaling on the inner wall of the heat exchanger, which leads to a significant decrease in the heat transfer coefficient. 2. Rust and impurities accumulate at the bottom of the shell side, resulting in poor heat transfer. 3. There may be equipment damage that blocks the bottom of the shell side, thereby reducing the heat flow rate or preventing it from circulating at all. What else? We’ll think about it later. Last edited by eddy-8280103 on 2009-3-15 22:20]
There are impurities, scaling, gas phase present inside the tube bundle, or the material flowing through the tube bundle is causing blockages. The solution is to core the heat exchanger and clean it with high-pressure water.