Combustion turbine and heat recovery system combination with SCR reactor assembly, and methods of assembling and using the same

A combination (T-H combination) combustion turbine power generating apparatus and heat recovery steam generator (HRSG), comprising:

• a combustion turbine, the HRSG, and an emission reduction system (ERS), wherein the exhaust of the combustion turbine, that is travelling through the HRSG, is treated by the ERS, and wherein the ERS includes:
• a) a first reducing reagent supplier (RRI1) that supplies a reducing reagent into exhaust output by the turbine,
• b) a first SCR reactor (SCR1) positioned downstream of the RRI1,
• c) a turbulence generator (TG) receiving exhaust from the SCR1
• d) a second SCR reactor (SCR2) downstream of the turbulence generator;
• and
• wherein the first reducing reagent supplier (RRI1) is the only exhaust output SCR reducing reagent supplier to each of the SCR1 and SCR2,
• wherein there is a steady state NH3/NOx mal-distribution level above 10% RMS reaching each of SCR1 and SCR2, and
• further comprising a first generator driven by the combustion turbine as to provide a first turbine-generator combination, and wherein the first turbine-generator combination has a power rating of at least 400 megawatts.