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SNG

The first step in producing SNG is the production of syngas via gasification. The raw syngas is cleaned up to remove particulates and to convert any COS to H2S, for later removal. In some cases, the CO2 generated can be captured and sequestered (CCS). In this case, the syngas is first processed by a shift converter to increase CO2 capture efficiency and increase the BTU content of the synthesized SNG. In an IGCC power plant, the syngas is used as fuel gas for a combustion turbine. When power demand is less, some of the syngas can be converted to SNG via methanation, and subsequently purified and compressed to meet pipeline quality and pressure. Obtaining reliable analysis in the SNG production process can be challenging due to extreme stream conditions.  The Optograf™ Gas Analyzer is a unique spectroscopic instrument capable of analyzing these challenging streams.

Typical IGCC Plant with SNG Production

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Application Notes
A table of downloadable application notes will appear if you rotate your device to landscape mode.
 
  Stream Service Key Measurement
Parameter
Application Note  
0 IGCC Plant SNG Production Analytics Overview   SY0
1 Raw Syngas from Gasifier Effluent Composition / CH4 SY1
2 Syngas after Scrubber Composition H2  / CO / CO2 SY2
3 Raw Syngas from Other Trains  Composition H2  / CO / CO2 SY3
4 Common Syngas Header and Scrubbers Composition H2  / CO / CO2 SY4
5 Shift Converter Outlet Composition H2  / CO / CO2 SY5
6 CO2  Absorber Outlet Composition H2 / CO / CO2 SY6
7 SNG at Methanator Outlet Composition CH/ H2  /  CO2 SY7
8 SNG to Pipeline Composition CH4 / H2  / CO / CO2 SY8
9 CO2  Recovery Stream Composition CH/ H2  /  CO2 / N2 SY9