Oil skimmer removes tramp oil from cooling emulsion in a cold rolling mill
In a cold rolling mill, the rolls used to manufacture the sheet steel regularly turned and reground to ensure the surface quality of the sheet. As the rolls are processed without prior cleaning, a lot of oil and grease is washed off the rolls by the cooling emulsion used. This oil and grease floats in a pre-separation basin with a surface area of approx. 1 m².
Task definition:
In order to keep the cooling emulsion quality stable and to increase the service life of the emulsion, the oil-fat mixture must be removed from the bath surface. Due to the very viscous consistency of the floating medium, previous attempts with various suction systems and different oil skimmers did not bring the desired success.
Solution: Friess oil skimmer model 1U
Oil skimmer 1U
Using an oil collector with a length of 3m, the entire surface of the basin could be reached. Due to the high viscosity, a very thick layer of oil was already adhering to the oil collector tube.
Depending on the thickness of the layer, the oil skimmer achieved a flow rate of over 30 l/h.
The oil was removed from the entire surface due to the rotary motion generated by the oil collector tube on the bath surface. In the previous tests, the oil was only removed in small localized areas, so that after a relatively short time only a mixture with a high emulsion content and low tramp oil content was removed.
Oil skimmer tramp oil on emulsion in a cold rolling mill
Overview of the results of the FRIESS oil skimmer:
- the entire surface could be reached with the oil collector
- Drastic increase in the service life of the emulsion
- Removal rate of 30 l/h of tramp oil (previously only drop by drop)