Biogas Upgrader

Basics

• A Device that "Upgrades" Biogas to the same quality and roughly the same standards as Natural Gas, thus allowing it to be used with the existing infastructure such as CNG
• May reduce damage caused by H2S if present in the biogas\
• This could also produce dilute sulphuric acid
• Supposedly steel wool works well as a scrubber (or more likely in our case as a failsafe) for hydrogen sulfide)

Short Term/Easy Solution

• The youtube channel Lucky Hill Farm (they essentially came to the same design as the Biodigester on their own, it's neat how that happens with things), has a simple setup using bleach and iron wool i think?
• Can be assembled quickly (at most a few hours), and uses common materials
• DOES require consumables and maitnence however, unlike more refined versions
• Also no sensors / industrial certification and all that

Existing Open Source Designs

• This Wet Scrubber + Electostatic Precipitator Combo
• An Indian Design Utilizing Rotary Contactors (Don't entirely understand it yet, need to look into it)

Minimum Viable Product

• Modular
• Removes H2S and CO2
• Has a low pressure out feed with quick disconnects to connect to other devices such as a Natural Gas Compressor

Design Research

• From Wikipedia:

Water washing The most prevalent method is water washing whereby high pressure gas flows into a column in which the carbon dioxide and other trace elements are scrubbed by cascading water running counter-flow to the gas. This arrangement can deliver 98% methane with manufacturers guaranteeing maximum 2% methane loss in the system. It takes roughly between 3% and 6% of the total energy output in gas to run a biogas upgrading system

So essentially a simple wet scrubber

Internal Links

• R-CNG
• CNG

External Links

• The Wikipedia page on Biogas Upgraders