Questions about the water-cooling design. Circulating water path
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I can see the CAD diagram for methanol distillation that has been prepared. A bypass is added between the inlet and outlet valves of the circulating water for each water cooler designed. That is, a portion of the circulating water goes directly from the supply pipeline to the return pipeline without passing through the water cooler. For example, the diameter of the inlet and outlet pipes is 200 millimeters. The small bypass is controlled by a 80-mm valve. I don’t understand what this route is used for
By the way, the production capacity is 1 million tons per year.
“A bypass is added between the inlet and outlet valves of the circulating water for each water cooler designed. That is, a portion of the circulating water goes directly from the supply pipeline to the return pipeline without passing through the water cooler. ” First of all, I must state that I am not familiar with your manufacturing process; without diagrams, I can only rely on analysis. I think the ’path’ mentioned by LZ refers to a bypass pipe, and the function of this bypass pipe is to regulate the flow rate of the circulating water (while keeping the flow rate of the circulation pump constant). When the bypass is open, the flow rate of water in the coolant circuit decreases, resulting in a poorer cooling effect ； The same is true in reverse. The water cooling efficiency of the water cooler is adjusted by regulating the size of the bypass. For example, if the inlet temperature on the material side is high, the bypass valve can be closed to increase the amount of water circulating through the water cooler, thereby ensuring that the outlet temperature on the material side still meets the design requirements. Conversely, if the inlet temperature on the material side is low, the bypass valve can be opened to reduce the amount of water circulating through the water cooler; although the heat exchange efficiency decreases, the outlet temperature on the material side will still meet the required standards. Of course, such regulation requires that the inlet temperature on the material side fluctuate within a certain range; exceeding this range will prevent the desired effect from being achieved. I may be incorrect due to my lack of knowledge of your manufacturing processes, but the above analysis is applicable to heat exchanger-type equipment.
The circulating water pipeline needs to be pickled. Opening a shortcut during pickling allows the acid to bypass the water cooler, which is not used for control purposes.
1. Its function is to regulate the flow rate of the circulating water; for example, in winter when the ambient temperature is low and less circulation volume is required, a shortcut can be used for adjustment. 2. When the heat exchanger is under maintenance, using this shortcut does not affect the normal operation of other processes
In my opinion, it is mainly used for the cooling water bypass circulation; for example, when repairing a water cooler, it is necessary to close the inlet and outlet valves of the water cooler and open the bypass circulation valve to prevent pressure buildup in the system upstream of the cooling water
It seems to be used for regulating the temperature of the cooled medium
There’s no need for so many cycles; the inlet or outlet can be closed, which also helps reduce energy consumption. To service the heat exchanger, it’s sufficient to close its inlet and outlet; it has nothing to do with finding a shortcut.
Why is the circulating water pipeline pickled? To clean what out of the pipes? In a typical circulating water system, isn’t the water cooler the key element for acid washing and pre-coating?