Biogas Purification
Biogas Upgrading System
Biogas is a renewable energy source and mostly produced from anaerobic digestion (AD). Biogas composition varies with the biomass digested and contains mainly methane (CH4) and carbon dioxide (CO2), as well as traces of hydrogen sulfide (H2S), ammonia (NH3), hydrogen (H2), nitrogen (N2), carbon monoxide (CO), oxygen (O2). Membrane technology as purification process is a relatively recent but very promising technology. Also, hybrid processes where membranes are combined with other processes are believed to have lower investment and operation costs compared with other processes.
Product Paramenters
Biogas Upgrading System Specification
Biogenic Methane Index: Over 97% or recovered in bio natural gas quality
Methane Recovery: Over 96%
Mode to utilize Biomethane: CNG or Gas Network
Unit Energy Consumption: 0.15-0.25 Kwh/Nm³ Methane
Operating Pressure: Medium or Low Pressure, 5-10 or 10-20 Bar (According to the product configuration)
Environmental Benefits: Minimum Greenhouse Gas Emissions
System Composition
Introduction of Membrane Technology
Membrane Technology
For the Membrane we choose EVONIK as our partner and membrane supplier. Their membrane upgrading process with SEPURAN® Green delivers a constant high biomethane grade with more than 99% purity. In other words, almost all the methane is recovered in bio natural gas quality.
Evonik has developed a biogas upgrading process that makes best use of the membranes' separation properties: Through skillful connection of SEPURAN® Green membranes it is possible to obtain methane with a purity level of up to 99% from the crude gas. Just one compressor is needed.
Polymide Membrane
SEPURAN® Green membranes have the highest CO2/CH4 selectivity and are therefore a superior technology for upgrading biogas. This selectivity of the membranes enables the production of high purity biomethane with superior methane recovery. This distinguishes the Evonik membranes from other membranes that are available.
BENEFITS OF SEPURAN® GREEN MEMBRANE TECHNOLOGY
* Reduced operating costs
* Low Investment
* Easy to operate
* Low space requirement and short installation times
* Flexible and modular Installation
* No chemicals required
* No additional drying stage
Typical Configurations
● Three Stage Membrane Process — Medium Pressure
Biogenic Methane Index: Over 97% or recovered in bio natural gas quality
Methane Recovery: Over 99%
Mode to utilize Biomethane: CNG or Gas Network
Unit Energy Consumption: 0.25-0.25 Kwh/Nm³ Methane
Operating Pressure: Medium Pressure, 10-20 Bar
Environmental Benefits: Minimum Greenhouse Gas Emissions
● Two Stage Membrane Process — Medium Pressure
Biogenic Methane Index: Over 97% or recovered in bio natural gas quality
Methane Recovery: Over 97%
Mode to utilize Biomethane: CNG
Unit Energy Consumption: 0.25-0.25 Kwh/Nm³ Methane
Operating Pressure: Medium Pressure, 10-20 Bar
Environmental Benefits: Lower Greenhouse Gas Emissions
● Two Stage Membrane Process — Low Pressure
Biogenic Methane Index: Over 97% or recovered in bio natural gas quality
Methane Recovery: Over 96%
Mode to utilize Biomethane: Gas Network
Unit Energy Consumption: 0.15-0.20 Kwh/Nm³ Methane
Operating Pressure: Low Pressure, 5-10 Bar
Environmental Benefits: Lower Greenhouse Gas Emissions
Pictures
