Abstract
Presents the results of studying the influence of initial steam parameters on the thermal efficiency of double-circuit combined-cycle plant based on a powerful high- temperature gas turbines of the last generation. The advantages of double-circuit combined- cycle plant without reheat in comparison with more complex schemes. Found optimal thermal efficiency values of initial parameters of steam.
Highlights
The combined-cycle plants (CCGT) based on the modern gas turbine units (GTU) are the most advanced power plants and the most important part of this plant is the modern gas turbine unit and there are many studies to increase their heat efficiency and the steam turbines effect on the plant efficiency too [1,2]
The study terms and assumptions: the study was made under nominal conditions, which are accepted in accordance with ISO 2314 for gas turbines; the steam turbine has two cylinders HPC and LPC, we considered that the low pressure water vapor diagram unaffected with the HPC in the mixing chamber; the pressure in the low-pressure (LP) is taken equal to 0,6 MPa to achieve a high thermal efficiency for the CCGT [6]; the condenser pressure takes the value 5 kPa because this value reduces the low-level parts of the steam turbine and the consumption of cooling water
Under conditions of permissible steam moisture at the end of the expansion process, the efficiency of the considered combined cycle power plant at the initial vapor pressure of 9.5 MPа reaches a value of 58.2 %
Summary
The combined-cycle plants (CCGT) based on the modern gas turbine units (GTU) are the most advanced power plants and the most important part of this plant is the modern gas turbine unit and there are many studies to increase their heat efficiency and the steam turbines effect on the plant efficiency too [1,2]. There is a wide variety of combined-cycle plant schemes but usually the designers prefer three-loop circuit with steam re-heating. It's useful to study the effect of the steam initial parameters on the thermal efficiency of dual-combined-cycle plant with a simpler scheme with simple cost and simple control system but with lower thermal efficiency from the three-loop circuit with steam re-heating [3,4]. The choosing priorities for the thermal scheme are simplicity and high reliability
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