Abstract
Intercooled cycle gas turbine has great potential in improving the output power because of the low energy consumption of high-pressure compressor. In order to more efficiently recovery and utilize the waste heat of the intercooled system, an organic Rankine cycle power generation system is developed to replace the traditional intercooled system in this study. Considering the effects of different kinds of organic working fluids, the thermodynamic performance of organic Rankine cycle power generation system is investigated in detail. On this basis, the sensitivity analyses of some key parameters are conducted to study the operating improvements of organic Rankine cycle power generation system. The results indicate that the integration of organic Rankine cycle and intercooled cycle gas turbine not only can be used for waste heat power generation but also increases the output power and efficiency of intercooled cycle gas turbine by selecting the organic working fluids of n-butane (R600), n-pentane (R601), toluene, and n-heptane. And compared to the others, organic Rankine cycle power generation system with toluene exhibits the best performance. The maximum enhancements of output power and thermal efficiency are 6.08% and 2.14%, respectively. Moreover, it is also concluded that both ambient temperatures and intercooled cycle gas turbine operating conditions are very important factors affecting the operating performances of organic Rankine cycle power generation system.
Highlights
Nowadays, gas turbine is playing a very important role in the fields of power generation and machinery propulsion
This study develops an organic Rankine cycle (ORC) power generation system to effectively recover the lowgrade heat of IC gas turbine intercooled system
To further study the potential value of ORC system for recovering the waste heat of compressor intercooling, Figure 12 presents the comprehensive performance of different organic working fluids at their maximum evaporation temperature using the evaluation criteria named the increment percentages of thermal efficiency (PC1) and output power (PC2)
Summary
Gas turbine is playing a very important role in the fields of power generation and machinery propulsion. Saavedra et al.[17] performed a thermodynamic optimization of ORC using different working fluids to recover the exhaust gas waste heat from gas turbine which was applied to drive a natural gas compressor station. They found that the highest ORC turbine output powers were obtained with aromatic hydrocarbons. For the ORC intercooled system shown, the high-temperature air from low-pressure compressor is cooled by organic working fluids in the intercooler. Variations of air outlet temperature of low-pressure compressor and intercooler efficiency at different ISO operating conditions. Worc Wicgt ð11Þ where Wicgt is the output power of IC gas turbine using traditional intercooler system
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