The new Biogas Dehumidification System (BDS) from HRS Heat Exchangers removes water from biogas.
The new Biogas Dehumidification System (BDS) from HRS Heat Exchangers removes water from biogas.

HRS Heat Exchangers has developed a new Biogas Dehumidification System (BDS) which removes water from biogas, protecting CHP engines from corrosion and cavitation.

One way to optimise the AD process in combined heat and power (CHP) plants is to ensure that any water present in the raw biogas is removed; if water enters a CHP engine it can decrease its efficiency, resulting in reduced biogas yields and engine damage.

The new Biogas Dehumidification System (BDS) from HRS Heat Exchangers removes water from biogas and also comes with a heat recovery section, increasing an AD plant’s overall energy efficiency.

The company says the BDS reduces biogas temperatures from around 40ºC to approximately 5-7ºC, condensing more than 90% of the water volume. It works via a chiller system which supplies a coolant that is transferred to heat exchangers. Biogas flows on the product side of the exchanger, while the coolant flows on the service side. As the biogas cools, the water condenses from the gas, leaving a clean and dry biogas ideal for use in CHP engines.

Heat recovery comes as standard with the HRS BDS. The resulting cold biogas is used to pre-cool any incoming biogas, reducing the load on the final cooling heat exchanger and recovering as much as 20% of the energy needed for the process.