Modelling and optimization of part-flow evaporative gas turbine cycles

Yari, Mortaza; Sarabchi, K.

doi:10.1243/095765005x31315

Cited by 3 publications

(3 citation statements)

References 33 publications

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“…This modeling approach serves for better accuracy and proved itself in our previous research of STIG and RSTIG cycles which we have modified it for the evaluation of intercooling and ISTIG cycles. The new model is based on our validated combustion model which is based on the chemical equilibrium approach rather than assuming complete combustion as in the previous thermodynamic cycle models . This allows for determination of combustion products considering thermal dissociations and ensures a more reliable analysis because thermal dissociations highly affect thermodynamic properties of combustion products and flame temperature .…”

Section: Introductionmentioning

confidence: 99%

“…The new model is based on our validated 50 combustion model which is based on the chemical equilibrium approach rather than assuming complete combustion as in the previous thermodynamic cycle models. 9,14,17,18,[51][52][53][54][55][56][57][58] This allows for determination of combustion products considering thermal dissociations and ensures a more reliable analysis because thermal dissociations highly affect thermodynamic properties of combustion products and flame temperature. 42,59 A further novelty is that our model is capable of calculation of adiabatic flame temperature in the primary combustion zone which enables parametric determination of NO x and CO emissions in combination with the existing chemical kinetic correlations.…”

Section: Introductionmentioning

confidence: 99%

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Thermoenvironomic evaluation of simple, intercooled, STIG, and ISTIG cycles

Kayadelen

Üst

2018

Int J Energy Res

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Summary Low‐technology cycle modifications available for improving gas turbine performance are still largely unexploited. Among those proven modifications, steam injection is found to be the most effective in boosting both the output capacity and thermal efficiency while reducing NOx emissions. It further improves part load performance under varying ambient conditions. Intercooling is another low‐technology modification which can improve performance of simple and steam injected gas turbine cycles. Because of the uncertainties relating to an efficiency comparison of steam injected and simple cycle designs, the decision as to whether it is worthwhile to give more emphasis to steam injected cycles should be made on grounds other than efficiency alone. Therefore, this study comparatively evaluates simple, intercooled, steam injected (STIG), and intercooled steam injected (ISTIG) gas turbine cycles from the points of efficiency, network output, economics, and pollutant emissions using an advanced validated thermoenvironomic model. Optimum cycle parameters are investigated. Economic feasibility of steam injection and intercooling on simple and intercooled cycles are evaluated using an updated plant cost data. Total and environmental costs as well as profit of the plant owner are estimated for varying fuel costs and varying cycle parameters such as pressure, steam injection, and equivalence ratio. Results of our analysis based on the characteristic cycle parameters show that network output increases up to 22.2% and 14% respectively, when steam injection is implemented on simple and intercooled gas turbine cycles which correspond to up to 6.7% and 4.4% decrease in specific fuel consumption. Steam injection decreases NOx emissions of simple and intercooled cycles up to 67.2% and 65.2% respectively, and provides up to approximately 126.3% increase in net profit of intercooled cycle at the expense of an increase in total cost by 3.3%.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermoenvironomic evaluation of simple, intercooled, STIG, and ISTIG cycles

Kayadelen

Üst

2018

Int J Energy Res

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“…In gas turbine cycles, water can be injected before the compressor, in the compressor, between the compressor stages, in an aftercooler, before a recuperator, or in the combustion chamber. Evaporative cooling not only increases the power and the efficiency but also reduces NO x emission [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Evaluation of First and Second Law Performance of Evaporative Cooling Schemes for Regenerative Gas Turbines

Bolattürk

Kanoğlu

Coskun

2007

Energy Exploration & Exploitation

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In this study, effect of evaporative cooling on performance of regenerative gas turbine cycle is investigated considering simple regenerative cycle and regenerative cycle with intercooling and reheating. Evaporative cooling is applied to inlet air in simple regenerative cycle while it is applied to compressor inlet air and air between the compressor stages in reheat regenerative cycle. The first and second law performances of the cycles incorporating evaporative cooling are compared to the corresponding conventional cycles. Effects of the temperature and relative humidity of the ambient air, the turbine inlet temperature, and the pressure ratio on the net work, the thermal efficiency, and the second-law efficiency of the cycles are investigated. It appears that evaporative cooling increases thermal efficiency, net work, and optimum pressure ratio. With respect to simple regenerative cycle at a turbine inlet temperature of 1400 K and at a pressure ratio of 20, the thermal efficiency and the net work increase by 1.5 percent and 4 percent, respectively by inlet cooling in simple regenerative cycle while they increase by 18.3 percent and 12.2 percent, respectively by inlet cooling and intercooling in reheat regenerative cycle. With respect to conventional regenerative cycle with intercooling and reheating, evaporative cooling applied to inlet air and for intercooling provides essentially no increase in thermal and second-law efficiencies while it increases the net work 8.2 percent to 17.8 percent depending on the ambient conditions. Increasing turbine inlet temperature gives a linear increase in the optimum pressure ratio. As the ambient temperature increases and the relative humidity decreases, evaporative cooling becomes more effective in improving cycle performance.

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