The gas first passes through a coalescing filter where particulates are removed. This prevents impingement on the heat exchanger fins and extends the life of the heat exchanger.
A Glycol mixture is chilled using a refrigeration unit. The glycol is then circulated through a heat exchanger where it cools the gas to the desired temperature. Any entrained liquid, as well as water in the saturated gas drops out, where it is removed automatically by either Drip Traps (Model 245 or 246AT) or via a Condensate Accumulator (Model 248). The gas leaving the heat exchanger is then run through a compressor to reheat the gas creating a dew point barrier and lowering its relative humidity.
As part of the gas cleaning and drying system, Varec Biogas can provide siloxane removal. When required, the gas temperature will need to be controlled in order to insure it does not have excess heat which can degrade the siloxane removal media. In this situation, a second heat exchanger can be supplied using the heat generated from gas compressors to reheat the gas.
For a complete gas conditioning system, Varec Biogas can include a compressor as part of the gas chiller/drying system. Varec Biogas will incorporate controls to manage the gas conditioning system and come with a safety scheme.