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Integrated Gasification Combined Cycle (IGCC) Technologies by Gary J. Stiegel, Ting Wang

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image [R1.18]

The second reaction, the Claus reaction, is equilibrium limited, and sulfur conversion is sensitive to the reaction temperature. The overall reaction is:

3H2S+3/2 O23H2O+3S [R1.19]

image [R1.19]

If more than 99.8% recovery efficiency is required in order to satisfy more stringent environmental regulations, a modified Claus process can be implemented with an add-on tail gas treating unit (TGTU) process (US DOE, 2009).

In order to convert H2S to S with a reaction [R1.18], a sufficient amount of SO2 needs to be present. Thus, a reaction [R1.17 ...

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