For pilot-scale units with relatively thin water circulation pipelines, how can normal operation be ensured in winter?
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Winter is approaching, and the pilot plant’s circulating water pipelines are relatively thin – how can normal operation be ensured during winter? Are there any good methods? How about adding antifreeze?
The inlet and outlet pipes can be connected and separated by valves; these valves should be opened after the water-using equipment is turned off to maintain circulation of the water
Electric heating wire heating can be considered during design.
Well, then it means that the temperature of the electric heat tracing should be the same as the water supply temperature, right?
Well, this supply and return water connection pipeline has been designed
If it is a pilot plant in a manufacturing enterprise, it is recommended to use low-pressure steam for heating, as chemical plants generally have an abundance of steam with low energy content； If there is insufficient steam, then electric heating should be used.
Could the temperature of the steam heating be a bit too high, potentially causing the water supply temperature to exceed the specified level?
If the circulating water is in motion and the heat tracing pipeline is not excessively large, not much heat can actually be transferred; it is sufficient to ensure that freezing does not occur.
Have you set up a bypass for the return water? If so, just turn on the bypass when it’s not in use – this will prevent freezing. If there is no bypass and the temperature is very low, consider using electric heating; steam heating might result in too high a temperature.
The method to be used depends greatly on the local temperature. The pilot plant should have a low water circulation volume, and electric heating is a more suitable option.