Questions about heat transfer oil! Urgent
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Dear teachers, the heat transfer oil does not flow within a section of the pipeline! Is there a risk from prolonged exposure to 400 degrees of heat?
When heat transfer oil remains stationary at high temperatures for an extended period, scaling can form on the inner walls of the pipes. This scaling can easily cause blockages in the pipes or filters, and over time it can gradually narrow the pipes, affecting the transportation of the hot oil!
Inside a closed tube! No flow! Is 400 degrees dangerous?
I don’t know what type of heat transfer oil you use, but generally the maximum temperature allowed for heat transfer oil is not more than 350 degrees Celsius
For ordinary heat transfer oil, we usually reach 300 degrees. For a certain section of pipeline, we preheat it with molten salt; once preheating is complete, that section of the pipeline is sealed off. The heat transfer oil inside this sealed section will gradually rise to 400 degrees, and this process takes a long time – several months
Under normal circumstances, molten salts require specialized heat transfer oils, and the operating temperature can be maintained around 500 degrees Celsius. It is not recommended to raise the temperature of ordinary heat transfer oils to around 400 degrees Celsius and have them remain in the pipes for extended periods of time.
There is still a risk; with such high temperatures, there have been many cases of fires caused by heat transfer oil in China. A fire in a sealed pipe won’t occur, but scaling will definitely happen, and it may even get blocked.
As long as it does not exceed the boiling point, does not vaporize, and no condition of overpressure is created, there will be no problems; however, coking will occur, leading to pipe blockages
The operating temperature of heat transfer oil generally does not exceed 350°C, and the acid value and carbon residue increase as the temperature rises. At the same time, thermal pyrolysis is likely to occur, resulting in carbon deposition on the inner walls of pipes and equipment, which affects heat transfer efficiency, accelerates the aging and degradation of the heat transfer oil, and also causes localized overheating in the pipes, leading to equipment damage and posing a risk to human safety.
You need to have the person from the manufacturer confirm this, as they are the ones who know best