Protection of High-Temperature Synthetic Heat Transfer Oil During Use:

2025-02-10 13:29:34

1. Preventing Oxidation: High-temperature synthetic heat transfer oil is prone to oxidation when operating at high temperatures in a heat transfer system, which can lead to deterioration. To prevent this, a high-temperature expansion tank is usually equipped with nitrogen for protection to ensure the closure of the heat transfer system, preventing contact between the oil and air, and thus extending the service life of the high-temperature heat transfer oil.

2. Preventing Carbon Deposition: When the operating temperature of high-temperature synthetic heat transfer oil exceeds the maximum allowable temperature, carbon deposition will occur on the inner walls of the heat transfer pipes. As the carbon layer builds up, the temperature of the pipe walls increases. The adhesion and carbon deposition, along with the increasing temperature of the pipe walls, further reduce the heat transfer performance and may lead to potential explosive hazards. Therefore, it is crucial to strictly control the temperature of the high-temperature synthetic heat transfer oil at the heat carrier outlet to not exceed the maximum operating temperature, and the maximum film temperature of the heat carrier should be lower than the allowable oil film temperature.

3. Regularly cleaning leak points, strengthening on-site monitoring, ensuring the integrity of the heat transfer system, and regularly inspecting the equipment for corrosion and leaks, with timely repairs if any are found. Therefore, the heat transfer system should be designed reasonably, and the wall thickness and pressure strength of the equipment should be regularly inspected during use. Pressure gauges, safety valves, and vent pipes should be installed on the equipment and pipelines.

4. Preventing Water and Other Impurities from Mixing with the Heat Carrier: As the heat carrier is heated, the dissolved water rapidly evaporates, causing a sharp increase in pressure within the heat pipes, which can lead to uncontrolled conditions and potential explosions. Therefore, high-temperature synthetic heat transfer oil should be heated slowly before use to remove water and other light impurities.

5. Regularly testing various indicators of high-temperature synthetic heat transfer oil, periodically determining and analyzing the residual carbon, acid value, viscosity, flash point, melting point, and other physical and chemical indicators of the heat carrier, to timely grasp its quality and analyze the reasons for any 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 high-temperature synthetic heat transfer has changed. Regularly adding new heat carriers in appropriate amounts to maintain the basic stability of the residual carbon in the system.