New Improvements in Existing Combined-Cycles: Exhaust Gases Treatment with Amines and Exhaust Gas Recirculation

The combined cycle plants (CCGT) in 2019 are upswing due to definitive closure of conventional coal-fired power plants. increase the price a ton CO2, will close 25 euros 2019, could allow their capacity factor above 50%. Already achieved high flexibility imposed by regulator Spanish network, REE, possible hybridizations both gas turbine (GT) and heat recovery steam generator (HRGS), it is necessary one step ahead directed reduction treatment flow exhaust gases at outlet HRGS boiler during operation. An optimization study based parametric analysis this reduction, with recirculation (EGR) them amines CO2 capture plant (PCC) exit boiler, has been carried out, using real data base, integration within existing CCGT. Results obtained very promising: firstly, use 35% EGR + PCC CCGT efficiency GT26 improve 0.5%. Secondly, total number tons avoid per year would be around 633 kt (using 0.41). Therefore, cost for 21.4 million euros/year. However, say that its current inclusion have negative impact on (close 4 points 21% respectively). All boil down conflict interests between €/MW lost versus €/ton avoided. Clearly now rising CCGT’s decisive future elucidate conflict.