Electrostatic oil purifier used in turbine oil system

According to different filtration principles, oil purifier can be divided into mechanical filtration, centrifugal filtration and electrostatic adsorption filtration. In actual projects, several different processing methods are often combined and applied.

1.1 Mechanical oil purifier

The mechanical oil filter intercepts particulate impurities in the oil through a mechanical filter. Its filtration effect is directly related to the accuracy of the mechanical filter. The filtration accuracy can currently reach up to 1μm. This type of oil filter is widely used in power systems. The double oil filter, oil return filter, and online filter generally configured in the lubricating oil system are all mechanical oil filters. Large impurities in the lubricating oil system can be removed by a mechanical oil filter, and small impurities can be removed by a precision mechanical filter element.

The disadvantages of mechanical oil purifiers are: the higher the filtration precision, the greater the corresponding resistance, and the oil supply pressure loss is larger; the service life of the filter element is relatively short, and the filter element needs to be replaced frequently during work. Careless operation may also cause artificial pollution. ; Cannot effectively filter out moisture, colloidal products and impurities smaller than the pore size of the filter in the oil. In order to overcome the above shortcomings, in engineering applications, mechanical oil filters are often used in conjunction with other purification methods (such as vacuum dehydration, etc.) to achieve the best treatment effect.

1.2 Centrifugal oil purifier

Centrifugal filtration technology uses a centrifuge to purify the oil in the tank. By rotating the oil containing particles and other pollutants at high speed, the impurities with a density greater than the oil are centrifugally thrown out to achieve the purpose of separating the pure oil. Its advantage is that it is more effective in removing free water and large particle impurities and has a large processing capacity. Its disadvantage is that it is less effective in removing small particles and cannot remove non-free water. Centrifugal filtration oil filters are widely used in fuel treatment in gas turbine power plants, and are often used in conjunction with mechanical filtration treatment methods in steam turbine lubricating oil systems. Because the centrifuge rotates at high speed, the equipment is noisy, has a poor working environment, and is large in size and weight.

1.3 electrostatic oil purifier

The electrostatic oil purifier mainly uses the high-voltage electrostatic field generated by the electrostatic generator to bring the pollutant particles in the oil with electrostatic ions and adhere to the fibers under the action of the electric field. The principle is shown in the figure below. Due to the use of adsorption principle instead of pass-through filtration, the electrostatic oil purifier can capture various impurities with a fineness of 0.02μm, including hard metal materials, soft particles, etc., and can remove them.

Charge adsorption principle diagram

Features of electrostatic oil purifier:

(1) High purification accuracy, filtration accuracy reaches 0.1μm, can remove sub-micron pollutants;

(2) It can effectively combine the vacuum system and coalescing system to quickly remove water and gas;

(3) The purification speed is fast, which can quickly process particles and purify quickly; the flow rate is large, which can meet the needs of flushing and cleaning;

(4) Cleaning system function. The electrostatic polymerization purification technology not only removes impurities and particles in the oil, but also removes acidic products, charged colloids, sludge, varnish and other harmful substances to prevent regeneration and improve the pH value of the oil. , reduce the price of dielectric loss factors and acid value, and improve oil product indicators;

(5) It has a wide range of applications and can work normally even if the water content in the oil exceeds the standard. It can work in oil with a maximum water content of more than 20%.

Item	Electrostatic oil purifier	Mechanical oil purifier	Centrifugal oil purifier
Accuracy range/μm	≥0.02	≥1	≥40
Soft particles	Completely remove	Not removable	Not removable
Oil sludge	Completely remove	Not removable	partial removal
Varnish	Completely remove	Not removable	Not removable
Purification time	Moderate	shorter	longer
Consumable costs	lower	higher	No consumables
Manual duty	No need	No need	Clean regularly