Construction and principle of operation
Dust and liquid separators are made in vertical configuration. They are designed for separation of solid and liquid particles from gas stream using its kinetic energy. As shown in the figure, a separator is a steel, welded structure. While calculating and designing the body, appropriate regulations of Bureau of Technical Inspection and requirements of Pressure Equipment Directive 2014/68/EU concerning the construction of pressure vessels are applied. Separation of liquid particles takes place in the “wet chamber” (the axial cyclone) to which gas flows through the inlet pipe, passing then into the “dry chamber” where it is filtered. Gas speed in the inlet pipe should be not less than 10m/s. At the inlet to the “wet chamber” gas is strongly swirled by stator vanes. A vortex is induced, with gas rotating speed increasing towards the swirl centre. This phenomenon is similar to the one that can be observed while water flows down a bath and a swirl is generated. Inertia forces that act on dust and fluid particles are many times higher than gravity force.
In this situation contamination particles are pushed towards the external wall of the separator’s body. Since gas speed in the layer adjacent to the wall is low, inertia forces are reduced. A partition built-in at the half of the height of separating section prevents any repeated entraining of collected particles by gas stream. Following this stage, gas stream flows upwards where it is additionally purified by a filter cartridge and finally it leaves the separator’s body through an outlet pipe.
FGWS dust and liquid separators are characterised by very high efficiency of gas cleaning, combining the features of cellulose cartridges and axial cyclones.
Filtration efficiency rates are:
• for liquid particles: 99,5% for particles > 10-12 µm
• for solid particles: 99,8% for particles > 5 µm
The above-mentioned filtration efficiency rates are achieved with gas speed in the inlet pipe not less than 10m/sec. With low gas speed, the separation of liquid particles from gas in the cyclone is smaller and this function is taken over by a filter cartridge. It causes quicker contamination or even sticking the cartridge if liquid is of huge viscosity (oils, lubricants, etc.). Filtration efficiency of solid particles on the filter cartridge does not depend on gas speed in the inlet pipe.
GAZOMET products pressure equipment according to quality system under Pressure Equipment Directive 2014/68/EU.
Thereby GAZOMET is entitled to mark the produced pressure equipment with CE mark.