The technology used for SOx removal is called flue gas desulfurization (FGD) and could be wet or day technology. The removal efficiency ranges from about 65% for the dry FGD to up to 95% for the wet FGD.
There are two technologies of NOX removal: selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR). SCR has a removal efficiency of about 90% while SNCR has about 60 to 70% removal efficiency.
For more detailed information, I'll upload my Yale lecture notes on these technologies. Please look up my uploaded publications at ResearchGate.net to download the lecture notes on these technologies.
thankyou so much Sir.I really got all the information I needed but I need to add this comparison between these two technology can I somehow get any references for that
The best way to reduce SOx emissions is to remove Sulfur from the fuel. NOx is more difficult because combustion air contains a great deal of N2 and air separation is usually not practical but California addressed the problem with low NOx burner designs like these: https://www.bing.com/videos/search?q=midco+low+nox+burner&&view=detail&mid=8B55163BCD6421495D298B55163BCD6421495D29&rvsmid=F93B3C7DF9759D2555A3F93B3C7DF9759D2555A3&fsscr=0&FORM=VDQVAP