A Study of Humidified Gas Turbines for Short-Term Realization in Midsized Power Generation—Part II: Intercooled Cycle Analysis and Final Economic Evaluation

Bartlett, Michael; Westermark, Mats

doi:10.1115/1.1788684

Cited by 11 publications

(4 citation statements)

References 4 publications

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“…While the STIG cycle, and variations such as the Cheng cycle [8], have received considerable attention historically, more recent developments have focused on variations of the EGT. In particular, there has been a significant interest in the humid air turbine (HAT) cycle, and variations, which use a humidifier rather than direct water injection [9][10][11]. However, since the cogeneration of steam is a desired output in this study, only the STIG cycle will be considered.…”

Section: Steam Injection Gas Turbine (Stig)mentioning

confidence: 99%

Thermodynamic Analysis of a Steam Injected and Recuperated Gas Turbine Air Compressor

Blom

Wiese

Brear

et al. 2012

Volume 3: Cycle Innovations; Education; Electric Power; Fans and Blowers; Industrial and Cogeneration

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Compressed air and steam are perhaps the most significant industrial utilities after electricity, gas and water, and are responsible for a significant proportion of global energy consumption. Microturbine technology, in the form of a Gas Turbine Air Compressor (GTAC), offers a promising alternative to traditional, electrically driven air compressors providing low vibration, a compact size, reduced electrical consumption and potentially reduced greenhouse gas emissions. With high exhaust temperatures, gas turbines are well suited to the cogeneration of steam. The compressed air performance can be further increased by injecting some of that cogenerated steam or by conventional recuperation.This paper presents a thermodynamic analysis of various forms of the GTAC cycle incorporating steam cogeneration, steam injection (STIGTAC) and recuperation. The addition of cogeneration leads to improved energy utilisation, while steam injection leads to a significant boost in both the compressed air delivery and efficiency. As expected, for a low pressure ratio device, recuperating the GTAC leads to a significant increase in efficiency. The combination of steam injection and recuperation forms a recuperated STIGTAC with increased compressed air performance over the unrecuperated STIGTAC at the expense of reduced steam production. Finally, an analysis using a simpli- * Address all correspondence to this author fied model of the STIGTAC demonstrates a significant reduction in CO 2 emissions, when compared to an equivalent air compressor driven by primarily coal-based electricity and a natural gas fired boiler. NOMENCLATUREa, c, d, e Number of mol CMF Corrected mass flow rate EGT Evaporative gas turbine GTAC Gas turbine air compressor H Enthalpy h Specific enthalpy HAT Humid Air Turbine HRSG Heat recovery steam generator ∆h f o Enthalpy of formation M Mach numbeṙ m Mass flow rate Mo Molar mass NIST National Institute of Standards and Technology q Heat release/transfer r p Pressure ratio S Steam ratio STIG Steam injected gas turbine STIGTAC Steam injected gas turbine air compressor 1

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Section: Steam Injection Gas Turbine (Stig)mentioning

confidence: 99%

Thermodynamic Analysis of a Steam Injected and Recuperated Gas Turbine Air Compressor

Blom

Wiese

Brear

et al. 2012

Volume 3: Cycle Innovations; Education; Electric Power; Fans and Blowers; Industrial and Cogeneration

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“…The current work is in effect an extension of the work performed by Bartlett and Westermark [15,16], by presenting a new concept for a high pressure wet cycle, TopCycle. TopCycle represents a strong and promising option in the category of modern small and medium sized power plants and offers highly efficient power and heat generation at plant sizes, which cannot be feasibly covered with CC.…”

Section: Introductionmentioning

confidence: 99%

TopCycle: A Novel High Performance and Fuel Flexible Gas Turbine Cycle

Dybe

Bartlett²,

Pålsson³

et al. 2021

Sustainability

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High pressure humidified cycles can combine high operational flexibility and high thermal efficiency. The current work introduces such a cycle, namely TopCycle, which provides the necessary combustion infrastructure to operate on a wide fuel variety in a steam-rich atmosphere. The cycle configuration is presented in detail, and its operation is exemplified on the basis of simulation results. Operation at design condition results in electric efficiencies higher than 50% (lower heating value (LHV)) and power densities higher than 2100 kW/kgair (referred to intake air flow). A sensitivity analysis identifies the cycle performance as a function of representative parameters, which provide the basis for future operation and design improvements. As for any gas turbine cycle, TopCycle’s electric efficiency can be effectively improved by increasing the turbine inlet temperature, optimizing the economizer heat recovery, as well as elevating the working pressure. Finally, TopCycle’s performance is compared to a state-of-the-art combined cycle (CC) at equivalent operation parameters. The TopCycle operates at an elevated electric efficiency and considerably higher power density, which can be transferred into smaller plant footprint and dimensions and thus lower investment costs at equal power output in comparison to a CC.

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“…Bartlett and Westermark investigated thermodynamic and economic potentials of steam injected cycle, full flow evaporative cycle, and the part‐flow evaporative gas turbine cycle with and without intercooling. They appreciated the nature of each cycle's heat recovery system with their composite curves and analyzed the response of each cycles to changes in pressure and the firing temperature.…”

Section: Introductionmentioning

confidence: 99%

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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A Study of Humidified Gas Turbines for Short-Term Realization in Midsized Power Generation—Part II: Intercooled Cycle Analysis and Final Economic Evaluation

Cited by 11 publications

References 4 publications

Thermodynamic Analysis of a Steam Injected and Recuperated Gas Turbine Air Compressor

Thermodynamic Analysis of a Steam Injected and Recuperated Gas Turbine Air Compressor

TopCycle: A Novel High Performance and Fuel Flexible Gas Turbine Cycle

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

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