Coalescing Gas Separators (Filter Separators)

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Coalescing gas separators are designed specifically for the removal of mist, fogs, and dust from gas streams. These contaminants usually exist with the bulk of the particles having diameters considerably less than 10 microns; therefore, standard separators or scrubbers are not capable of effectively removing these minute particles. Coalescing gas separators consist of a vessel combining specially constructed fiberglass coalescing elements and a separation section with either a wire mesh or vane type mist extractor. A liquid accumulation section is provided to properly collect and discharge the liquid for further processing or disposal. Coalescing takes place as the gas passes through the fiberglass in the sock-type replaceable filter elements. The fiberglass forces small particles to agglomerate (coalesce)-forming larger drops or particles. The resulting larger droplets are then removed from the gas as the stream flows through the separator section. The wire mesh or vanes of the mist extractor provide further removal of entrained droplets. All separated droplets are then collected in the liquid accumulation section. Any dirt, dust, rust, and scale in the gas will be removed on the outside surface of the filter elements.


Typical application for coalescing gas separators are listed below:

1. Ahead of compressors to remove dust and liquids which could cause damage to the compressor valves and cylinders.

2. Ahead of dry desiccant dehydrators to prevent compressor lube oil fog or other liquid contaminants from entering the absorber bed and causing degradation and excessive loss of effectiveness of the desiccant or treating media.

3. Ahead of glycol dehydrators to remove compressor lube oil fog, salt water fog, dust, rust, and scale from the gas stream and prevent contamination of the glycol solution. It is imperative to install a coalescing filter separator upstream of a glycol dehydrator when gas is to be dried following compression.

4. Ahead of amine treating units to prevent contamination of the amine solution by dust, rust, iron sulfide, scale, and liquid contaminants.

5. Ahead of lean oil absorption plants to prevent contamination of the system by dust, rust, scale, and salt water.

6. Ahead of short cycle hydrocarbon recovery units to prevent "poisoning" of the desiccant.

7. In the compressor fuel system to prevent plugging of the various orifices and valves.

8. In refrigerant compressor discharge to recover the refrigeration compressor lube oil and to prevent contamination of the heat transfer surface in the process chiller or exchanger.

9. Downstream of glycol absorbers or contactors to recover the entrained glycol mist carried overhead.

10. Downstream of amine treating units to recover the amine solution and to prevent contamination of subsequent process equipment.

11. Following lean oil absorbers to recover the lean oil (reducing operating costs), and to eliminate possible contamination of process equipment.

12. Ahead of metering and regulating town border stations to assure long life and low maintenance of the turbine meter or standard orifice meter.