HRS - Model BDS Series - Biogas Dehumidification System
From Systems - Environmental System
The HRS Biogas Dehumidification System (BDS) removes water from biogas, protecting combined heat and power (CHP) engines from corrosion and cavitation. It can be supplied with a heat recovery section, increasing the overall efficiency of anaerobic digestion (AD) plants.
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Product Details
The HRS Biogas Dehumidification System (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.
More than half of the heat transfer duty is used to condense the water contained in the biogas, while the remainder is used to reduce the gas temperature. As it cools, the water separates from the gas, leaving a clean biogas ideal for use in CHP engines.
A heat recovery option is available, whereby the resulting cold biogas is then used to pre-cool any incoming biogas. This reduces the load on the final cooling heat exchanger, recovering as much as 20% of the energy needed for the process. Any extra investment required is soon recouped in energy cost savings.
As one of the most expensive pieces of equipment on an AD plant, protecting a CHP engine makes good business sense. By removing water from biogas before it enters a CHP engine, the HRS BDS helps to extend an engine’s lifespan, protecting it against corrosion and cavitation. It also increases its efficiency, leading to increased biogas yields, and, if opting for the energy recovery version, will result in energy savings, too. Suitable for AD plants of all sizes, it comes skid-mounted with an automatic control panel for full process control, and can be adapted for ATEX-compliant applications.
The HRS BDS Series is an efficient solution to cool and dehumidify biogas for combustion with two standard options. The system condenses up to 90% of the water contained in the gas, which is continuously separated before the lean biogas is ready for use. This is a necessary process for all bio-energy plants that use biogas as fuel in CHP engines.
A heat recovery step can be included as a standard option thus reducing energy costs up to 20%, Cold gas at 5o C is used to precool the incoming gas at 40o C, whilst raising the temperature of the dehumidified gas to approximately 36o C before use. A chiller is included to provide the energy required for the process.
The BDS comes complete with controls in a packaged ‘plug and play’ skid.
Benefits
The benefits of the HRS BDS system include:
- Condenses >90% of the water present in biogas by reducing biogas temperatures from 40ºC to 5-7ºC
- Leaves a clean, green gas ideal for converting to thermal energy or electricity in a CHP engine
- Protects CHP engines from corrosion and cavitation, extending engine lifespan and increasing efficiency
- Up to 20% energy recovery available, reducing energy costs
- Suitable for biogas flows from 150-1,700 kg/h
- Skid-mounted for easy access and freedom of movement
- Automatic control panel
- ATEX-compliant version available
Features
- Condenses >90% of the water present in biogas
- Up to 20% energy recovery available, reducing energy costs
- Skid-mounted for easy access and freedom of movement
- Automatic control panel
- ATEX-compliant version available
- Unit insulated with Armaflex
Applications
- Environmental
- Biodiesel
- Anaerobic Digestion (AD) and Biogas
- Waste Water
- Sewage Treatment
- Food & Beverages
- Pharmaceutical
- Industrial
Technical Data
Standard Materials of Construction
- Service Side: AISI 304 Stainless Steel
- Biogas Side: AISI 316L Stainless Steel
Other material options available
Standard Connections
- Service Side: Flange
- Product Side: Flange
All flange types available
Surface Finish
- External: Matt
- Internal: Matt
Standard Design Conditions
- Service Side: 6 bar/80°C
- Biogas Side: 2 bar/80°C
Design Code and Compliance
- PD 5500, PED 2014/68/EU, ASME - TR CU 032, DOSH Compliant
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