Integrated Gasification Combined Cycle (IGCC) systems are so-called "clean coal" technologies that use gasification processes to turn coal or biomass into a synthesis gas or syngas.
This syngas is then used to power a combined cycle gas turbine where the gas drives one turbine, while the heat created from the gasification process and first turbine is used to create steam that in turn drives a second turbine.
When used at coal power plants the gasification process removes many of the impurities in the coal leading to reduced sulfur dioxide, particulates and mercury emissions, while the use of the combined cycle system results in higher levels of efficiency than at conventional coal plants.
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