Substitute natural gas
|This article does not cite any references or sources. (October 2008)|
Substitute natural gas (SNG), or Synthetic natural gas, is a fuel gas that can be produced from fossil fuels such as lignite coal, oil shale, or from biofuels, when it is named Bio-SNG or from renewable electrical energy.
The Great Plains Synfuels Plant injects approximately 4.1 million m3/day of SNG from lignite coal into the national gas grid. The production process of SNG at the Great Plains plant involves gasification, gas cleaning, shift, and methanation.
Renewable electrical energy can also be used to create SNG (methane) via for example electrolysis of water or via a PEM fuel cell in reverse to create hydrogen which is then reacted with CO
2 from for example CSS/U Utilisation in the Sabatier reaction.
2 + 4H2 → CH4 + 2H2O
It is advantageous to distribute SNG and bio-SNG together with natural gas in a gas grid. In this way, the production of renewable gas can be phased in at the same rate as the production capacity is increased. The gas market and infrastructure the natural gas has contributed with is a condition for large scale introduction of renewable biomethane produced through anaerobic digestion (biogas) or gasification and methanation Bio-SNG.
- Dakota Gasification Company. "Gasification". Retrieved 2012-06-20.
- SGC Rapport 187 Substitute natural gas from biomass gasification
- SGC-rapport on gasification and methanation