By Peter Jansohn
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3 This figure will grow to 9340 GW by 2035, a net increase of 3900 GW (IEA, New Policies Scenario). However, the total capacity addition between 2011 and 2035, including replacements of old plants, will be 5890 GW. Nearly 1400 GW of these gross capacity additions will be gas fired power plants; coal (including IGCC) and wind will take respectively 1100 and 1250 GW. Based on these figures, an average yearly minimum of 58 GW of gas turbine powered plants will be realised up to 2035. Based on an estimate that eventually half of the new coal capacity would be built as IGCC, this figure could easily grow to 80 GW per year.
1 Introduction Gas turbines have made their way into quite a number of applications since this type of thermal machine was proposed for the first time in the late eighteenth century (Barber, 1791). After a tough learning period – it was not until 1903 that the first gas turbine with net power output was assembled by Aegidius Elling (Store Norske Leksikon) – gas turbine based technologies are now setting world standards in two major industrial applications in the mobility sector and the electric power generation business: jet engines for the aero industry, and combined cycle power plants for electricity generation (Fig.
Along with the efficiency of these large plants, the maximum power output has been pushed to ever higher values, now reaching about 500 MWel for a single gas/steam turbine power train, and up to almost 1 GWel for so-called 2-in-1 plant configurations (the exhaust gas heat from two gas turbines is fed into one bottoming steam cycle/steam turbine) (Mitsubishi, 2010; Siemens, 2011c) (Fig. 14). Part load performance of gas turbines is hampered by the inherent linking of mass flow/pressure/temperature during the compression and expansion steps of the process.