What are the hidden dangers in the use of thermal oil furnace electric heaters?

The thermal oil furnace electric heater is a specialized oil product with good thermal stability for indirect heat transfer. Because of its uniform heating, accurate temperature control, high temperature at low Vapor pressure, good heat transfer effect, energy saving, convenient transportation and operation, it has been widely used in various occasions in recent years, and its usage and consumption are also increasing.
The electric heater of the heat stable heat transfer oil furnace is prone to Pyrolysis reaction due to local overheating of the heating system during use. The electric heat transfer oil furnace in Yancheng generates volatile and low flash point oligomers, and polymerization reaction between oligomers generates unmelted polymers, which not only hinders the flow of oil products, but also oxidizes stable heat transfer oil, dissolved air and heat carrier systems with the same heat transfer efficiency, which are full of residual air, The generated organic acid and colloid adhered to the Oil pipeline will not only affect the service life of the heat transfer medium, block the pipeline, but also easily cause acid corrosion of the pipeline, increasing the risk of leakage during system operation.
Avoid oxidation of heat transfer oil. Due to the high temperature operation of heat transfer oil in the heat carrier, it is prone to oxidation reaction, leading to the deterioration of heat transfer oil. Therefore, high-temperature expansion tanks usually use nitrogen filling protection to ensure the sealing of the heat carrier system, avoid contact between heat transfer oil and air, and extend the service life of heat transfer oil. Avoid coking of heat transfer oil. When the working temperature of the heat transfer oil exceeds the operating temperature, coking will occur on the oil pipe wall. As the coking layer thickens, a high oil pipe wall temperature will promote adhesion and coking, and the thickened pipe wall temperature will further increase. Due to the continuous thickening of the pipe wall, the heat transfer performance deteriorates, making it prone to pipe explosion accidents. Therefore, it is necessary to strictly control the temperature of the heat transfer oil at the outlet of the heat carrier to not exceed the operating temperature, and the film temperature of the heat carrier must be less than the allowable temperature of the oil film.
It can prevent impurities such as water mixed in the heat carrier from rapidly evaporating with the heating of the heat carrier, causing a sharp increase in pressure inside the heat pipe, causing uncontrollable degrees and accidents. Therefore, the heat transfer oil should be slowly heated before being put into use to remove moisture and other light and heavy impurities from the heat transfer oil. Regularly test the physical and chemical indicators such as residual carbon, acid value, viscosity, flash point, and melting point of the heat carrier, and regularly measure and analyze the indicators of the heat transfer oil to timely grasp the quality changes and analyze the reasons for the changes. When the acid value exceeds 0.5mgKOH/g, the viscosity change reaches 15%, the flash point change reaches 20%, and the residual carbon (mass fraction) reaches 1.5%, it indicates that the performance of the heat transfer oil has changed. Regularly and appropriately replenish new heat carriers to maintain a stable residual carbon content in the system.
In the die-casting industry, the application of electric heater of heat conduction oil furnace also has great development space, especially in the production of magnesium alloy and aluminum alloy. Improper or improper mold temperature will cause dimensional instability of castings, roof deformation, hot pressing, sticking, surface depression, shrinkage cavity, hot bubble and other defects in the production process. It also affects the production cycle, such as filling time, cooling time, and spraying time. In addition, due to undercooling and overheating, the lifespan of the mold is short, and expensive steel can produce hot cracks, accelerating its aging.