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[Since the 1920s, a process known as gasification has been used.]
[It is in the front end of a process known as IGCC--Integrated Gasification Combined Cycle.]
[IGCC delivers electricity from abundant supplies of a domestic resource ]
[while still meeting strict environmental standards.]
[The process begins with coal entering the system mixed with water, ]
[creating a slurry that has the consistency of heavy oil.]
[The slurry is injected into the gasifier along with oxygen ]
[where it is heated to very high temperatures to produce synthesis gas, or syngas.]
[The hot syngas is fed into the radiant syngas cooler.]
[Heat from the gas is transferred to the high pressure steam system]
[for integration into the steam power production cycle of the plant.]
[The syngas moves to the low temperature gas cooling system]
[where more heat is extracted for useful work.]
[The syngas passes through an activated carbon bed that removes mercury.]
[Once it leaves this area, there are almost undetectable amounts of mercury.]
[It then continues to the acid gas removal process]
[where hydrogen sulfide is separated from the syngas ]
[and later converted into elemental sulfur that can be used in chemical processing.]
[Syngas, hydrogen and carbon monoxide ]
[The unique gas turbine generator was specifically designed for this system.]
[Excess high pressure nitrogen from the air separation unit ]
[is used in the gas turbine as a diluent in the combustion process]
[to reduce the formation of nitrogen oxides, ]
[a regulated pollutant that is known to create smog.]
[A selective catalytic reduction, or SCR unit, ]
[integrated into the HRSG, further removes nitrous oxide ]
[formed in the combustion process to achieve ultra low emissions.]
[The hot exhaust gases create steam in the HRSG]
[and is combined with steam from the RSC]
[to drive a steam turbine generator to produce even more power from the plant]
[that is sent to homes and businesses to power our world.]
[The remaining gases are released from the stack in the HRSG,]
[achieving levels of cleanliness not attainable by traditional coal plants.]
