【Chemical Process Operations】According to the \"Detailed Rules for Equipment Inspection in Refining and Chemical Enterprises,\" the temperature difference of the circulating water cooling system must not be less than 6°C; our plant...
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This post was last edited by Xiao Gong 1985 on 2016-3-16 09:31. According to the 2007 edition of Sinopec’s \"Rules for Equipment Inspection in Refining and Chemical Enterprises\", under Section 10 on Industrial Water Management, the temperature difference in the circulating water and cooling water systems should be between 8–10°C; it must not be lower than 6°C. A deduction of 1 point will be applied if this requirement is not met； In our factory, the temperature difference in the circulating water is often only 4°C; if it’s a bit higher, production becomes unstable and it’s necessary to start the circulating water fan ； We are still a bit short of the standard. Is there any way to increase the temperature difference in the circulating water system without affecting production?
Is there a problem with your heat exchange equipment?
Ask the utilities department at your factory.
Check what the inlet and outlet temperatures of the circulating water are Especially the inlet temperature
Our factory doesn’t have a utilities department, eh:o
Based on my observations these past days, the inlet water temperature was 20°C, and the outlet water temperature was 24°C℃； Today, the inlet water temperature is 25°C and the outlet water temperature is 29°C. The temperature difference between the inlet and outlet of some water coolers on the unit is too small; plans are to reduce the return flow to these water coolers in order to increase the temperature difference ； Other reasons such as scaling of the water cooler and adjustments to the circulating water cooling system (we use an air-cooled open-loop circulating water cooling system) mean it won’t be possible to fix them any time soon
That’s scaling; it can only be checked by shutting down the system for maintenance. There should be no internal leakage in the water cooler at the moment
It is not yet possible to determine whether there is a problem: first, it is necessary to verify whether all the heat exchangers in the cooling water system achieve the cooling efficiency required by the process design； If the design requirements are met: there may not be any major problems ； It is recommended to adjust the cooling water flow rate (in order to achieve energy savings) ； Of course, considering stopping one of the cooling fans is also an option ；
Please confirm whether your factory has a proper system for treating circulating water, as well as whether regular cleaning and pre-coating of the system are carried out. It is recommended to first check the historical data regarding temperature differences; these differences are related to factors such as the system’s load and the flow rate of the circulation pumps； The magnitude of the temperature difference is also affected by the cleanliness of the heat exchange surface (such as scaling or deposits of algae and microbial sludge, etc.); relying solely on one temperature value is not very scientific. It is recommended to make a comparison with previous data, preferably those from when the system first started operating. It would be more helpful if more data could be provided.
In the petrochemical industry, the temperature difference is also only 2°C; during winter, when temperatures are low, the thermal load of the system is low as well, and using the smallest possible circulation pump results in the same temperature difference. It’s necessary to consider various factors before making a decision
Hello, are there still any issues with the cooling water? I work in cooling water treatment, using physical treatment methods