Thermodynamic and environmental consideration of advanced gas turbine cycles with reheat and recuperator

Abstract

ABSTRACT:The role of gas turbine power plants in electrical energy production has been considerably increased in the last two to three decades. Various methods have been proposed to improve the performance of gas turbine cycles. In this research, two methods, a reheat cycle (RC) and a cycle with a reheat and a recuperator (RHC), were investigated and compared with a simple cycle (SC). The main objective of this paper is to study the performance of an RC and RHC under actual conditions. In this regard, all processes are treated as actual, and in particular a relatively simple and reliable approach is used to predict the amount of cooling air. The results obtained on the basis of a model developed for this research show that reheating in the context of a realistic study may lead to an improvement both in efficiency and in specific net work using recuperator cause to decrease NOx emission.

Performance of an oxy-fuel combustion CO2 power cycle including blade cooling

“…The allowed blade metal temperature of a GT to be limited to 850 C (see Table 4). Finally, the convective cooling efficiency depends on cooling technology and is within the 0.2-0.3 range [19,24]. Here the mid-high basic value of 0.25 is assumed.…”

“…This value is within the practical range of gas turbines (i.e. 50-90 K), in order to have a reasonable stage enthalpy drop [19,[21][22][23][24].…”

“…They are taken from data available in the literature [13,14,19,[22][23][24]. Specifically, St g ¼ 0.005 with good accuracy and practically invariable along the cooled expansion path [13,19,23], whereas the A b /A g ratio between the blade surface area A b and the gas passage area A g is a practically linear function of DT g and may be reasonably assumed in the range 3.5-4.5 for a row temperature drop within the 65-85 K [19,22,24]. These values allow a good agreement of model results vs. actual cooled gas turbine measured parameters.…”

Effect of Compression Ratio on Performance of Combined Cycle Gas Turbine

“…The best combination of process parameters of steam leaving the steam generator that will give optimum performance of the CCGT power plant were determined at part load operation. Results for the optimum values of thermal efficiency and power output together with values of the decision variables are presented [8]. Khaliq and Kaushik [9] created the simulator of the combined-cycle co-generation power plant.…”

Study on effective parameter of the triple-pressure reheat combined cycle performance

“…Additional the development in GT technology, as well as increases in ST cycle temperature, and pressure, HRSG stage design enhancement, is expected to achieve further CCGT power plants efficiency improvement [7,8]. Results for the optimum values of thermal efficiency and power output together with values of the decision variables are presented [10,11]. The Brayton cycle has high source temperature and rejects heat at a temperature that is conveniently used as the energy source for the Rankine cycle plant.…”