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Electrostatic filtration

Electrostatic filtration : Designing and manufacturing of varnish removal plant using electrostatic filter(NN-EOF) and applying high technology of self controlled gradient field,Niroonamad khorasan is ready to cooperate with industries in order to increase the oil life time.

What is varnish?

Varnish is a layer that forms because of oxidation,high temperatures, moisture or any other physical /chemical reactions. The mentioned factors will cause the depletion of anti oxidant additives so the oil is exposed to oxidation. After oxidation free radicals combine and form yellow,light brown or dark brown substances called varnish.

The problems caused by varnish:

As varnish molecules are insoluble in mineral and synthetic oils, they deposit on internal surfaces of equipments or sealants and cause substantial problems:

1-Increase the wear rates of valve components,load gears and in some cases bearing surfaces.

2- Shorten the lubricant’s life by reacting with anti-oxidant system.

3- Increase maintenance costs due to cleanup and disposal of oil.

4- Decrease the effectiveness of heat exchangers, making it more difficult to control fluid temperature.

Electrostatic filters are classified into two groups:

1-plate electrostatic filters:

This system is composed of two plate electrodes . There are some rows of filter medias (2-5) between them. Using a current of 15 kv, these systems create an electric field that drives varnish toward the electrodes. In these systems, the electrodes need to be changed due to varnish deposit on them. In addition, the systems using this method , create arc in the oil and make it ionized. Applying this kind of filtering is not recommended at all because contamination may return to the oil from electrodes.

2-Cylindrical electrostatic filters:

This system whose technology belongs to USA and Japan, has been localized by Niroonamad Khorasan engineers. In this system,contamination deposit on a special media located in an electric field rather than their deposit on electrodes and it results in preventing arc and ionization. In addition , it is safe and efficient and doesn’t let the contamination return to the oil. It is a bypass system which is installed beside the oil tank. The varnish existing in lubricating system is dissolved in the oil gradually and collected by electrostatic filter. Due to this fact that just certain amount of varnish is dissolved in oil, if we pass the whole oil through the filter once, varnish which has deposited on internal surfaces of pipes, gets soluble and needs to be removed again. This must be repeated for several times (during a certain period of time e.g 1-6 months) till the system gets cleared of varnish.

That’s why electrostatic systems are used as an option (accessory ). It can be separated from the main purification unit. For getting assured of electrostatic system,first, the moisture and suspended particles of oil must be removed by a purification machine that is equipped with a magnet filter,dehydrate vacuum and a filter for particle removal and then an electrostatic filter must be used.