Coalescing Filter

In the oil and gas industry, the petrochemical industry and the oil refinery, liquid / gas coalescer filter are frequently used to remove liquids from gases such as seal gas, fuel gas, heating and cooling gas, injection gas as well as numerous technical gases. The coalescing filter element from BOLL & KIRCH 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.

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 (be it the simplex coalscer or the 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 our coalescer filters take into account are, for example:

volumetric flow rate
pressure
temperature

The individual components’ state in the gas play 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). Here you find an overview of our coalescer / coalescing filter:

Simplex Filter

BOLLFILTER Simplex Type 1.78.1 / 1.58.1 »

Flange Connection: ASME or DIN 2 ½" - 14" or DN 65 - DN 350
Connections inline: Inline in option
Filter element: star-pleated element disposable cartridges

BOLLFILTER Simplex Type BFB-C HD »

Features: The simplex filter for separating solids and aerosols (humidity) from gases. Gases saturated with dirt and humidity are separated by the multi-layered coalescer element (see figure).
Flange Connection: ASME or DIN ¾” - 8" / DN 20 - DN 200
Filter element: fiberglass/stainless steel disposable cartridges* Option available for preliminary separation using demister, cyclone, or cyclone demister all within the same housing.

Duplex Filter

BOLLFILTER Duplex Type BFD-C HD »

Features: Duplex filter for separating solids and aerosols (liquid content) from gases
Flange Connection: ASME or DIN ¾” – 8” or DN 20 – DN 200
Filter element: Fiberglass/stainless steel disposable cartridges (as normal temperature and high/low temperature design); Option available for preliminary separation using demister, cyclone, or cyclone demister all within the same housing.

BOLLFILTER Duplex BFD-C/P Double Block and Bleed »

Features: A special design duplex filter for separating solids and/or aerosols (liquid content) from gases using a patented double block and bleed main transfer valve. This is intended for applications using high pressures and/or dangerous gas compositions, to ensure maximum operator safety.
Flange Connection: ASME or DIN ¾” – 8” or DN 20 – DN 200
Filter element: Fiberglass/stainless steel disposable cartridges* Option available for preliminary separation using demister, cyclone, or cyclone demister all within the same housing