Adi<br>
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I work in the UK Power industry & have done for many years. I am not realy sure what you are after. However the comment that Indian power plants & where they locate their DA is the same as most UK plants e.g. High Marnham PS the DA is after the LP heaters & before the HP heaters...
I work with Siemens V94.2 Gas Turbines at a combined cycle gas turbine power station, they control the NOx levels by using a hybrid gas burners. The GT starts up in diffusion burner mode for a stable flame (this flame has hots spots leading to high NOx levels, Once above a certain gas outlet...