Selection of medium for high temperature oil tank and precautions

At present, more and more industries use high temperature oil tank, but how to choose the medium of high temperature constant temperature oil tank has become a problem Generally speaking, the medium of constant temperature oil tank usually adopts edible oil, cylinder oil, silicone oil, etc Under normal conditions, the insulation resistance of these oil media is very high After the electric heating wire is electrified, the heat is directly transmitted to the heating media However, there are great potential safety hazards in this structure First, the temperature of the electric heating wire is very high after it is electrified, at least above 300 ℃ ~ 500 ℃, The heating medium, such as cooking oil and cylinder oil, is easy to carbonize, reducing the insulation resistance between the heating wire and the shell of the standard constant temperature bath, thus making the shell charged In particular, two problems should be paid attention to in the use of dimethylsilicone oil: one is the standard problem According to the kinematic viscosity, dimethylsilicone oil can be divided into 50 centistokes, 100 centistokes, 20 centistokes, 300 centistokes and other types, namely, 50, 100, 20, 30 No.0 oil, the larger the number, the greater the viscosity, and it is not easy to keep uniform temperature at low temperature; No Above 0 ℃), the temperature field silicone oil will become more and more thick with time, which makes the lower limit of temperature field temperature control increase, the uniformity of temperature control decrease, and it is not easy to keep constant temperature Therefore, the 20-300 dimethylsilicone oil is generally used in the constant temperature field of 100-300 ℃, and the use frequency is once a week on average, no more than 5 hours, which can guarantee one year Pay attention to the viscosity change of oil at ordinary times, so as to update in time Some manufacturers favor it because of the same family and low viscosity of benzyl silicone oil and dimethylsilicone oil, which is not desirable Because a large number of fumes will volatilize when the temperature of benzyl silicone oil is about 250 ℃, that is, benzene volatilizes, resulting in the volatilization of Du gas in the room When the ventilation is not good, it makes it difficult for people to breathe and the eyes are stimulated to shed tears Therefore, benzyl silicone oil cannot be selected as the heating and temperature control medium