Wet gas turbine plants

As Frutschi and Plancherel [ 1) have explained, there are two basic gas turbine plants with water injection they are illustrated in Fig. 6.1. 

There are many variations on these two basic cycles which will be considered later. But first we discuss the basic thermodynamics of the STIG and EGT plants. 

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The conversion of nitrogen to ammonia is high, 60 to 90%. To reduce NOx emissions from a gas turbine plant to acceptable levels, the ammonia is removed from the product gas in a wet scmbber located immediately upstream of the gas compressor. HCN formation is low, much less than 1%. 

Particulate removal from the coal gas is effected either through a series of dry-sofld and wet-sofld removal steps or through the use of dry soflds filters, so that the gas fed to the combustion turbine is essentially free of suspended particulates. The emissions of total suspended particulates (TSP) from a CGCC plant are about one-third those from a comparable pulverized coal plant equipped with a fabric filter and EGD unit. 

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