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The ConocoPhillips E-Gas process features a unique two-stage gasifier design. The gasifier is refractory-lined and uses a coal-water slurry feed. The syngas produced by the first stage enters the second stage. Additional coal-water slurry is injected into this hot syngas in the second gasifier stage, but no additional oxygen is injected. Endothermic gasification reactions occur between the hot syngas and the second stage coal feed. This lowers the temperature of the syngas and increases the cold gas efficiency of the process.
The E-gas process has been used at the 260-MW Wabash River IGCC project in Terre Haute, Indiana since start up in 1995. A new gasifier, gas turbine and heat recovery steam generator replaced an original coal-fired boiler. The plant retained an existing, 30-year old, 100-MW steam turbine. Cinergy owns and operates the combined cycle plant and SG Solutions LLC owns and operates the gasification plant. ConocoPhillips is also developing a new IGCC project at the Excelsior Energy Mesaba IGCC Plant in northern Minnesota scheduled to come on-line in 2013. |
