Development and application of a thermodynamic-cycle performance analysis method of a three-shaft gas turbine

Gu, Chen; Wang, Hao; Ji, Xing-xing; Li, Xuesong

doi:10.1016/j.energy.2016.06.094

Cited by 31 publications

(17 citation statements)

References 12 publications

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“…Flack [11] calculated the performance of a single-shaft power generation gas turbine using the parameter cycle method based on gas turbine characteristic curves and component-matching conditions. Wang [12][13] developed a thermodynamic cycle calculation method of a three-shaft gas turbine with a hybrid cooling model to investigate the characteristics of gas turbines on a wide load range when the power turbine operates at a fixed physical speed. The cycle calculation model, as the basic work of the research, was initially used for the selected gas turbine, and its compressor, combustion chamber, and turbine modules were all considered.…”

Section: Model and Calculation Methodsmentioning

confidence: 99%

Effect of Inlet Air Heating on Gas Turbine Efficiency under Partial Load

et al. 2019

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A novel heating technology is presented to analyze the influence of inlet air heating on gas turbine efficiency under partial load. This technology uses the waste heat of a low-temperature heat sources, which includes but is not limited to the exhaust gas of a combined-cycle heat-recovery steam generator or a single-cycle gas turbine. A calculation model of the equilibrium running point is used for the given load and the characteristic curves of the compressor and the turbine to study the mechanism of the inlet air heating technology. Then, the equilibrium running line is calculated and drawn in the characteristic curves of the compressor and the turbine. The factors for gas turbine efficiency are discussed through the calculated equilibrium running line. The results show that an increase in inlet air temperature has considerable potential for improving gas turbine efficiency due to the increase in compressor and turbine efficiency. This finding is different from traditional viewpoints. Meanwhile, each partial load has an optimum heating temperature which becomes higher when the load is lower.

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Section: Model and Calculation Methodsmentioning

confidence: 99%

Effect of Inlet Air Heating on Gas Turbine Efficiency under Partial Load

et al. 2019

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“…3 shows the main performance parameters of the gas turbine under MAPO conditions when the nozzle area of the PT is in the design state, which serve as a reference for the following studies. When a turbine is in a critical state, the variation of corrected mass flow coincides with the change of its nozzle area [11]. Therefore, the influence of the PT nozzle area on the gas turbine performance can be simulated by adjusting its corrected mass flow in the model [22].…”

Section: Resultsmentioning

confidence: 99%

“…However, these technologies entail additional equipment installation, which not only makes the entire cycle system more complex, but also increases operating costs. In addition to above methods, operating optimization based on fuel flow (FF) and variable area nozzle (VAN) control has been carried out for many years [9][10][11][12][13][14]. Compared with pure FF control, this method can improve the operating flexibility by adjusting the power distribution of each turbine [10].…”

Section: Introductionmentioning

confidence: 99%

“…Many studies have put an emphasis on improving the part load thermal efficiency by closing the VAN of power turbine (PT). Gu et al [11] have investigated on a three-shaft gas turbine, the thermal efficiency is improved by approximately 1.0-1.5% under part load conditions with initial temperature remaining at the designed level. Haglind [12] has conducted simulation studies on single-shaft and two-shaft gas turbines.…”

Section: Introductionmentioning

confidence: 99%

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Research on the performance improvement of a two-shaft gas turbine with a variable area nozzle power turbine

Zhao

2020

THERM SCI

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Both an increase in atmospheric temperature and a decrease in atmospheric pressure can lead to the degradation of the maximum allowable power output (MAPO) or the thermal efficiency of a gas turbine. In order to reduce these adverse effects, this paper provides a simulated study on the improvement of the MAPO and the variations of the thermal efficiency due to the fuel flow and variable area nozzle control under different atmospheric conditions. Simulation results indicate that the MAPO increases with the power turbine nozzle area, while the thermal efficiency shows a parabola trend. With the same increment of the power turbine nozzle area, the improvement of the MAPO goes up as the atmospheric temperature rises and the decrease of thermal efficiency is alleviated. Analyses show that the slow degradation of the compressor isentropic efficiency is a key factor that enables the MAPO to increase significantly and the thermal efficiency to remain almost constant.

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“…Childs has made prominent contributions and summarized his achievements in his book [20]. Researchers have put forward several useful method [21][22][23][24][25] to solve nonsynchronous self-excited vibrations, such as anti-preswirl method.…”

Section: Resultsmentioning

confidence: 99%

Numerical Investigation of the Leakage and Rotordynamic Characteristic for a Short Staggered Labyrinth Seal

Zhong

2017

MATEC Web Conf.

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Short staggered labyrinth seals are widely used in high pressure cylinder shroud seals of steam turbines. They are good at restricting the leakage flow but do not respond well to rotordynamics and often lead to turbomachine instabilities. A numerical investigation into the leakage and rotordynamic characteristics of a short staggered labyrinth seal is carried out in this paper, concerning effects of pressure ratio, inlet preswirl, rotational speed, seal clearance and whirling frequency, using both the whirling rotor method and the multiple frequencies transient simulation method. The numerical model is verified by experimental data. The result shows that the staggered labyrinth seals have a similar but not identical leakage and rotordynamic performance compared with that of teeth-on-stator see-through labyrinth seals. The cross-coupled stiffness can be reduced by decrease inlet swirl with considering the factor of rotational speed, which can significantly benefit the stability of rotor system.

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Development and application of a thermodynamic-cycle performance analysis method of a three-shaft gas turbine

Cited by 31 publications

References 12 publications

Effect of Inlet Air Heating on Gas Turbine Efficiency under Partial Load

Effect of Inlet Air Heating on Gas Turbine Efficiency under Partial Load

Research on the performance improvement of a two-shaft gas turbine with a variable area nozzle power turbine

Numerical Investigation of the Leakage and Rotordynamic Characteristic for a Short Staggered Labyrinth Seal

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