Filtration processes

Hydro-mechanical processes

1. Coalescers

Are designed for treatment of liquid and gaseous medias and separation of solid and liquid contaminants from the process stream. Separation of liquid contaminants in coalescers is effected due to the ability of filter-element to coalesce (accumulate) liquid aerosol particles of fine diameter (starting from 0,3 micron) into larger droplets and to drain these droplets into the sump system. Models VGC – gas and SW and V – liquid coalescers separate various liquid contaminants from hydrocarbon flow, simultaneously catching solid particles of micron size.

Coalescing cartridges are worked out for liquid and gaseous media processing, where fine treatment is required. In general, filtration process is realized due to the following mechanisms of particles capture: contacting, sieving, acceleration capture, gravitation and diffusion sedimentation, electrostatic interaction.

Captured inside the filtration material and accumulated on filtration material surface particles serve for newly coming particles as complex element of filtration media and improve filtration efficiency. As particles quantity increase, gas permeability of filtration media goes down, thus filter cartridges have to be replaced. In case only liquid contaminants are captured, filter operates with a permanent resistance in self-regeneration mode.

Superfine mist of lubes or moisture, contained in gas, is captured due to movement of the stream around the structural obstacles of pore layer. As filtered flow goes thru several layers of filtration material with further increase of pore diameter, mist particles reach droplet size and move inside the layer from inside down under gravitation force. Depending upon separation efficiency required, “Omni technologies” equips its filters-coalescers with filter cartridges of necessary configuration and efficiency parameters.

2. Centrifugal filtration

Separation systems with multicyclone elements are designed for separation both of liquid and solid contaminants from gas, air or vapor flows and have the following advantages: absence of moving parts, reliable operation under the temperature up to 500 °С, high efficiency, stable pressure drop value, simple maintenance and wide range of application.

Major property of design – installation of cyclone tubes section, fixed between two tube sheets. Gas enters the cyclone section and then enters each tube, where fast spinning and gravity force move contaminants (both solid and liquid) from inside the tube to its outer wall. Further on the contaminants under gravity influence move to the bottom sump and then are forced out by the operator or automatically. Clear gas passes through gas nozzles, located at the upper tube sheet and then leaves the vessel.