Biogas Upgrading Technologies
Biomethane can be upgraded to meet the same standards and specification as natural gas, and may be injected into the local natural gas grid or local transmission system.
To produce biomethane, the Carbon Dioxide (CO2), Hydrogen Sulphide (H2S), moisture, and any other trace contaminants that may be present, must be removed.
This is achieved by means of an upgrading plant.
There are four main biogas upgrading technologies commercially available – membrane based, pressure swing adsorption (PSA), water washing (physical absorption), and amine gas treating (chemical absorption).
Each process has its advantages and disadvantages and each one may be appropriate for a project based on the specific customer requirements.
BOC’s biomethane solutions can incorporate any one of these technologies provided it is identified as the optimal solution for meeting the needs of the customer.
The biomethane produced from the upgrading process, if it is to be supplied into the national gas grid, needs to be odourised, have its Calorific Value (CV) adjusted as required by propane enrichment and finally analysed to ensure it meets the required specification for natural gas.
BOC’s biomethane solutions cover the complete biomethane to grid supply chain from raw biogas in to biomethane injected into the grid.
In some cases, it may be possible and economically beneficial to capture, purify and liquefy the carbon dioxide from the upgrading process.
CO2 Capture & Liquefaction
BOC’s solutions can include CO2 capture, liquefaction and storage as required.
BOC has an extensive CO2 supply and distribution infrastructure across the UK which can be utilised to extract additional value for any carbon dioxide captured.
These additional services can be included as part of BOC’s biomethane solution.