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1.Oil Mist Separator Introduction
Oil mist separators are an integral part of the crankcase ventilation system and separate the gas and liquid components. The oil removed is then returned to the oil system and clean air is recycled to the intake system.
The oil mist separator is designed to meet the requirements of the specific engine in terms of the size of the droplets to be removed, the changing flow volume and the quantity of oil in the system. A small pressure loss must also be guaranteed to ensure a constant vacuum in the crankcase under all operating conditions. This pressure loss is controlled by separate or integrated pressure regulator valves. Systems with blow
by heating have been developed for engine operation at extremely low temperatures. The quality of the oil mist separator has a direct effect on combustion and oil consumption in the engine.
2.Principle & Structure
This system is composed of a lamellar element, a casing, a tank for the collected liquid, and a syphone so it is possible to attach a gas inlet and outlet in the middle of the duct through a flanger. The below figure shows the cross section of the lamellar.
The lamellar element is a kind of an obstructive plate and it is arranged at 45℃ against the direction of gas flow. Gases pass through the amellar while electricity flows, and the collection tank installed at the edge of the lamellar becomes to have negative pressure. On the other hand, the mist contained in gases collides with the lamellar because of the centrifugal force which is generated between inertia and gas current, and becomes attached to it. And it flows on the surface of the lamella and is inhaled into the collection container. The liquid collected in the container flows down to the tank for the collected liquid due to gravity, which goes through syphone and is continuously discharged out.
The collection container of the lamellar becomes to have negative pressure so there is no re
scattering of the separated liquid. And lamellar is installed according to the characteristics of gases and mist so the separation efficiency is very high.
3.Features
1. High separation efficiency:It becomes different, depending on the particle diameter of mist, content, specific gravity, and viscosity, but separation efficiency is over 99.8%.
2. No stoppage.It is a current inertia-type mist separator so it is not blocked even by dust-containing gases.In addition, for the mist containing very viscous dust, a cleaning system can be installed.
3. Low pressure drop.Lamellar element has small resistance so even though gas velocity is high, pressure drop can be treated low.
4. High gas velocity.Normal velocity is 5~7m/sec.
5. Small installation area.Velocity is maintained high so the filtering area of lamellar elements is small against velocity so lamellar separator takes a small area.
6. Low installation cost for large gas quantity.Velocity is high so the system is very compact and the installation cost is low.
7. Easy repair.Like a wire mesh or a ceramic filter, there are no stoppage and driving part so it is easy to repair. No manipulation is necessary during operation.
Heat and corrosion resistant.Element can be made of any of stainless steel and plastics, and it is possible to select a material suitable for the gas conditions.
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