The temperature of the enamel-stired tank cools down slowly
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There are three anchor-type enamel-lined mixing tanks, used for handling substances such as tetrachloroethylene, hexachloroethane, and hexachlorobutadiene. These tanks are equipped with jackets for cooling; the cooling medium is low-temperature dichloromethane. The inlet temperature of this medium is -10°C, while the outlet temperature is -5°C. The temperature of the material entering the mixing tanks is 70°C, and it needs to be cooled down to below 10°C. Initially, the temperature dropped by 10°C per hour, so it was possible to reach below 10°C within a few hours. However, now the cooling rate of all three units has suddenly become very slow – sometimes the temperature drops by less than 1°C per hour. The supply of low-temperature dichloromethane as well as its inlet and outlet temperatures were checked, and no abnormalities were found. The composition of the material was also examined, with no issues detected. It’s not clear what the cause of this problem is
Originally, one person could be satisfied with one bowl of rice, but now even three people are given just one bowl, and none of them get full. Why is that? ? ?
There’s no issue with the amount of water used for freezing; it worked normally during the previous periods, but the problem started appearing in the last few days
The cooling effect of the material is related to its physical properties and flow conditions. Since it has been confirmed that there are no issues with the composition of the material, it is necessary to check whether there have been any changes in its flow conditions, such as the flow rate and direction of the medium in the jacket, as well as any changes in the flow pattern of the material inside the tank. In addition, scaling also reduces the efficiency of heat transfer.
The problem with dichloromethane is that it leaks when the temperature rises