Biogas Conditioning

Everyone talks about synergies. We capitalize on them! 

Years of experience in plant and equipment engineering, development leader in natural gas service stations, and manufacturer of fuel vapor recovery systems – all this, taken together, has put us in a position to become, in the shortest possible time, a highly competent partner in the field of biogas conditioning plants. Based on our experience in the fields mentioned above, we offer excellent craftsmanship, reliable adherence to standards, and efficient planning. This is demonstrated in the above-average quality of our systems, which are paired with services we provide to ensure the ideal cost-benefit ratio for your biogas conditioning system. We attach particular importance to reducing ongoing operating costs. With electrical consumption at less than 0.2 kWh/Nm³, referenced to the raw gas, we set standards here.

Biogas conditioning by way of physical absorption 

The biogas conditioning process developed in recent years by Schwelm Anlagentechnik GmbH represents a consistent refinement of a concept that has already established its position on the market – biogas conditioning by way of physical adsorption or physical washing (polyglycol scrubbing). 
The material used to clean the biogas, i.e. to enrich the biomethane it contains, is an organic absorption agent based on polyethylene glycol. The fluid, developed especially for this process, is able to selectively remove from the raw biogas components that are undesirable in the biomethane. The absorption fluid offers excellent selectivity, especially for CO2, H2S and water. The absorption process takes place in a pressurized, packed column using the counterflow principle. Methane concentrations of 98 percent by volume can be achieved in the downstream biomethane. The absorption fluid is regenerated in a packed column, too. This is done by increasing the temperature, reducing pressure and blowing stripping air into the fluid, once again in a counterflow system. The familiar problem of methane loss through simultaneous absorption can be minimized by selecting appropriate operating parameters for the conditioning plant. Methane losses of less than 1% (referenced to the volume of methane in the raw biogas) can be guaranteed, subject to correct system operation and parameterization.  The process described here has been optimized by Schwelm Anlagentechnik GmbH to the extent that operations require minimum engineering work and energy input. Our biogas conditioning plants are thus characterized by especially profitable procurement and operating costs in all areas. 

Make your own comparisons!

Available at present are plants ranging in size from 200 to 700 Nm³ of product gas (biomethane).

  • Physical scrubbing process under pressure, with novel, stable scrubbing solution 
  • Conditioning raw biogas to biomethane quality approved for feed-in in accordance with DVGW regulation G260 
  • Pure gas quality of up to 98 percent methane by volume 
  • High pure gas pre-pressure at approx. 6 bar (gauge) 
  • Extremely energy-efficient operation; overall energy needs of less than 0.2 kWh/Nm³ of raw gas 
  • No process heat has be applied 
  • Redundant design of the compressor and pump sections 
  • Low methane losses, less than 1% (referenced to the methane content in the raw biogas), for small installations methane loss is less than 0,2% 
  • Virtually no methane slip (less than 0.1%) 
  • Optimized, high-quality engineering based on experience in chemical plant construction 
  • Autothermic waste gas scrubbing, also without requiring external process heat 
  • Drying the biomethane (PSA system) to the desired dew point  before output 
  • Low maintenance costs for the system as a whole 

The generation of biogas through fermentation, based on renewable raw materials, has exhibited dynamic growth since 2006. Due to current market developments and thanks to the Renewable Energies Act (EEG) newly revised and passed once again in 2010, positive development potential can be expected.

For all those who would like to take a deeper look at developments.