Why does screw air compressor oil coking? A series of chemical changes occur in the screw air compressor oil.
Screw air compressor lubricating oil belongs to the organic compounds with mineral oil as an example, it is mainly composed of various hydrocarbons (alkanes, cycloalkanes and aromatics points etc.), oxidation occurs hydrocarbon heat, oxygen, light, heat, oxygen contact strength is more high, the oxidation reaction rate of the oxidation more strongly. The molecular chain is likely to fracture, crosslinking, chain scission and crosslinking both will make hydrocarbons have the nature of change, in the actual application performance for the oil viscosity increase, an increase of acid value, color change, insoluble increases, when the depth of oxidation reaction when the oil viscosity increased significantly exceeding a certain range, it the phenomenon of coking oil.
Of course, different kinds of screw air compressor oil oxidation reaction occurs when the nature of the change is different, in the actual application, screw air compressor oil most coking accidents are caused by the use of mineral oil, here are some common screw air compressor oil oxidation after oxidation products.
Type
Characteristics of deep oxidation products
comparative analysis
Paraffinic base mineral oil
With the increase of oxidation degree, the viscosity increases continuously and finally becomes hard carbon
Easy coking
Ester type (synthetic oil)
Oxidation resistance is better than mineral oil, oily sludge is formed after deep oxidation, and usually hard carbon is not formed
Difficult to coking
Polyethylene glycol type (synthetic oil)
In the presence of high temperature oxygen, it is easy to break chain to produce low molecular oxide, dissolved in oil or rapidly volatilized, and does not generate carbon deposition and sludge
Non coking
Some polymeric hydrocarbons
There is no residue in chain scission at high temperature
Non coking
According to the above analysis, compared with mineral oil, synthetic air compressor oil has excellent comprehensive performance. With the trend of compressor of high load, large displacement, high temperature, long service life and user requirements of intensive use of air compressor safety and efficiency, and reduce the total cost of maintenance cost and operation, puts forward higher requirements on the performance of the air compressor oil, synthetic air compressor lubricating oil to the value of its advantages have been There is nothing comparable to this. Is widely used.
