Under normal circumstances, heat transfer oil has good heat transfer performance, so the direct basis for determining whether the heat transfer oil in a heat transfer oil furnace has failed is the heat transfer effect. However, the true determination of whether the heat transfer oil has failed still relies on laboratory data, and sometimes chromatographic comparison analysis.
According to research: the flash point reduction does not exceed 20% of the original index; the kinematic viscosity change does not exceed 15% of the original index; the acid value is not greater than 0.5 mgKOH/g; the carbon residue is not greater than 1.5%. When all or two of the above four main indicators are unqualified, it is determined that the oil has failed. It is particularly important to note that the "flash point" indicator, which relates to safety performance, must be taken seriously. When this value changes too much, even if other indicators are qualified, replacement of the heat transfer oil must be considered.
Of course, to save costs, some heat transfer oils can be regenerated, but the performance of regenerated heat transfer oil is often inferior to that of new oil. Since heat transfer oil usually has a high carbon residue when it fails, the heat transfer oil furnace, heat-using equipment, and pipelines must be cleaned before replacing the heat transfer oil. A dedicated heat transfer oil cleaner can be used for cleaning. In places with environmental restrictions, steam flushing is also a good method. To use heat transfer oil effectively, it is necessary to correctly select the heating furnace, choose a unit with strong design capabilities, select the appropriate heat transfer oil, emphasize safety education during the use of the heat transfer oil furnace, and strictly follow operating procedures. Only in this way can the safe and stable operation of the heat transfer oil furnace system be ensured.
