BOLLFILTER Coalsecer filter
In the oil and gas industry, and the petrochemical industry, liquid / gas coalescer filter are frequently used to remove liquids from gases such as seal gas, fuel gas, heating and cooling gas, and injection gas as well as numerous technical gases. The coalescing filter element consists of two layers, which fulfil different tasks: The first layer separates solids that may still be in the gas stream. In the second layer, liquid droplets are separated into a special tissue by coalescing the droplets.
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Function
The small liquid droplets contained in the gas bond together on the fleece to form larger droplets (coalescence = compound). Gravity causes the droplets to flow down to the fleece fabric as soon as they have reached a certain size. The separated liquid can be collected and, if necessary, stored in a liquid container. Level measuring systems, magnetic level indicators or sight glasses (optional accessory) can be used to check the level.
Design
In order to ensure an optimal filter design (simplex coalescer or duplex coalescer), various factors are taken into account:
- separation efficiency
- differential pressure
- quantity of solid and liquid particles to be expected
- gas components
Other operating parameters that are considered:
- volumetric flow rate
- pressure
- temperature
The individual components’ state in the gas plays a major role when designing the filter and selecting the appropriate separation mechanisms. Coalescing filters are generally used as a fine separator for droplets (concentrations normally in the ppm range).