What are the separation methods for air compressor oil and gas mixtures?

According to the different separation mechanism, two different oil and gas separation methods are adopted in the air-injection screw air compressor unit. One is called the mechanical method, that is, the collision method or the cyclone separation method. It relies on the gravity of the oil droplets and the centrifugal force to separate the oil droplets with larger diameters from the gas. Actual tests have shown that oil droplets larger than 1 Î¼m in diameter can be effectively separated by mechanical means. The other is an affinity coacervation method, which is made of a special material (generally called a fine oil separator or a separator core), and the oil droplets having a diameter of 1 Î¼m or less are first coalesced into a larger diameter oil droplet, and then Separate again.
These two different oil and gas separation methods are generally used in the oil-injected screw compressor unit, that is, mechanical separation is used as the coarse separation, and affinity condensation method is used as the fine separation.
In the early mechanical method, the collision method was generally adopted, that is, an obstacle was placed in the flow direction of the oil and gas mixture. When the oil and gas mixture collided with the obstacle, the oil droplets in the mixture will gather on the surface of the obstacle and act under gravity. Next, fall to the bottom of the separator. When using the collision method, the velocity of the oil and gas mixture hitting the obstacle has a certain range, and the optimum value is related to the density of the gas and the lubricating oil. In general, the optimum impact speed is about 3 m/s.
In modern units, cyclone separation or a combination of two methods is generally used for coarse separation. This method is to set up a cyclone channel in the oil and gas separator. When the oil and gas mixture enters the oil separator, first through the cyclone channel, the large oil droplets will be smashed under the wall under the action of centrifugal force, and then fall under the action of gravity. Go to the bottom of the separator.
When the oil and gas mixture is separated by mechanical means, about 99.7% of the oil will be separated, and the oil droplet diameter is less than 1 Î¼m at this time, and it is no longer possible to separate by mechanical means.