Problem of circulating water consumption in the device
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The facility has a circulating water system that supplies circulating water to several units (such as coking and catalytic units). According to the daily energy consumption report, 40–50 tons of circulating water need to be added per hour, which I find confusing. The circulating water goes into the coolers of these units and then returns; so how can these units consume such a large amount of circulating water? Where is the consumed circulating water mainly used? Thank you, looking forward to your participation
It’s mainly the loss from the cooling tower. There are evaporation losses, splash losses, and also discharge losses, right? It’s clearer without an understanding of large-scale chemical engineering. 140-50 tons per hour, so the total circulation volume must be over 2000 cubic meters
The loss of circulating water is generally attributed to leaks within the equipment and pipelines, as well as evaporation that occurs in the circulating water heat exchangers. The amount of water lost can typically be estimated at around 3% to 6% of the circulating flow rate. If it exceeds this range, there may be a leak due to damaged equipment or pipes.
After heat exchange within the circulating water system, the water must return to the cooling tower where it cools down through air convection; this process is primarily based on evaporation. The typical temperature drop is 8–10°C, and about 1.5% of the circulating water volume needs to evaporate. It is also necessary to remove waste water in order to prevent excessive concentration of salts in the water, which could lead to scaling. This accounts for around 1% of the water volume. There are also losses due to leaks and other factors. To maintain the balance of water volume in the entire circulating water system, fresh water needs to be added continuously.
Electrochemistry could be considered; it helps save water and reduce emissions, and above all, it saves energy