How Do Coalescing & Separation Filter Elements Achieve Oil-Water Separation?

How Do Coalescing & Separation Filter Elements Achieve Oil-Water Separation?

Coalescing and separation filters are used in oil-water separation systems to mainly separate oil-water mixtures, suspensions, emulsions, etc. After the oil flows into the coalescing separator, it first flows through the coalescing filter element, which removes solid impurities and coalesces tiny water droplets into larger water droplets.

Most of the coalesced water droplets can be separated from the oil by their own weight and settle in the water collection tank. At this time, the submerged oil gradually floats up and is discharged through the pipe above the filter. This achieves the purpose of oil-water separation.

The process of coalescing and separation filter elements are as follows:
Solid -- Liquid separation -- Demulsification -- Coagulation -- Separation -- Adsorption

How do the coalescing and separation filter elements separate oil from water:

1. The sewage pump sends the oily sewage into the oil-water separation filter element. After passing through the diffusion nozzle, the large oil droplets float on the top of the left oil collection chamber;

2. The sewage containing small oil droplets enters the corrugated plate coalescer in the lower part, where some oil droplets are aggregated into larger oil droplets to the right oil collection chamber;

3. The sewage containing smaller oil droplets passes through the fine filter to remove impurities in the water and enters the fiber polymerizer in turn, so that the small oil droplets are aggregated into larger oil droplets and separated from the water.

4. After separation, the clean water is discharged through the discharge port, and the dirty oil in the left and right oil collection chambers is automatically discharged through the solenoid valve, while the dirty oil separated by the fiber polymerizer is discharged through the manual valve.

The following is a detailed introduction to the working process of oil-liquid separation:

1. The oil flows through the separation filter element. Since the separation filter element has good lipophilic and hydrophobic properties, it further separates water, and finally the clean, water-free oil flows out of the coalescing separator. The oil first enters the lower part of the filter housing through the inlet pipe, and then flows through the filter element from the outside to the inside. At this time, the coarser particles will immediately settle down and be released by the drain valve, and the smaller particles will be intercepted by the filter element.

2. Finally, the clean oil is collected by the filter element tray and flows out of the coalescing separator through the outlet pipe. As the amount of oil being processed increases, the pollutants deposited on the filter element will cause the pressure difference of the coalescer to rise. When the pressure difference rises to 0.15Mpa, it means that the coalescing filter element has been blocked and should be replaced.

3. The oil flows into the primary tray from the oil inlet of the coalescing separator, and then is diverted to the inside of the primary filter element. After filtering, demulsification, water molecule growth, and coalescence, impurities are trapped in the primary filter element, and the coalesced beads settle in the sedimentation tank. The oil enters the secondary filter element from the outside to the inside, gathers in the secondary tray, and flows out from the outlet of the coalescing separator. The material of the secondary filter element is hydrophobic, and the oil can pass smoothly. The free water is blocked outside the filter element, flows into the sedimentation tank, and is discharged through the drain valve.

The coalescing and separation filter elements are a purification equipment required to purify oil-water mixtures, suspensions, emulsions, etc., so that the contaminated liquid is cleaned to the state required for production and life, that is, to make the liquid reach a certain degree of cleanliness.