Development of Key Technologies for the Next Generation High Temperature Gas Turbine

Ito, Eisaku; Okada, Ikuo; Tsukagoshi, Keizo; Masada, Junichiro

doi:10.1115/gt2011-45172

Cited by 8 publications

(6 citation statements)

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“…The reformer and permeate zones were separated by a palladium‐based fully dense hydrogen perm‐selective membrane such that the two zones are in flow communication and are thermally coupled. Palladium‐based membrane has been widely used for separating pure hydrogen experimentally . The equations that describe hydrogen permeation through the membrane has been developed and validated against experimental results .…”

Section: Numerical Modelmentioning

confidence: 99%

Performance analysis of a membrane‐based reformer‐combustor reactor for hydrogen generation

Sanusi

Mokheimer

2018

Int J Energy Res

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Summary Hydrogen is mostly produced in conventional steam methane reforming plants. In this work, we proposed a membrane‐based reformer‐combustor reactor (MRCR) for hydrogen generation in order to improve heat recovery and overall thermal efficiency. The proposed configuration will also reduce the complexity in existing steam methane reforming (SMR) plants. The proposed MRCR comprises combustion zone, hydrogen permeate zone, and SMR zone. A computational fluid dynamics model was developed using ANSYS‐Fluent software to simulate and analyze the performance of the proposed MRCR. Results show that high hydrogen yields were observed at high reformer pressures (RPs) and low gas hourly space velocities (GHSVs). Furthermore, by increasing the steam to methane ratio and addition of excess air in the combustion side, the hydrogen yield from the MRCR decreases. This is attributed to the reduction in the effective temperature of the hydrogen membrane. High RP, low GHSV, and low steam to methane ratio that increased the hydrogen yield also decreased carbon monoxide (CO) emissions. For an increased RP from 1 to 10 bar, the CO emission decreased by about 99%. The reduction in CO emission at high RP would be attributed to the effect of water gas shift reaction in the MRCR. Results of the extensive parametric study presented in this work can be used to determine the operating conditions based on tradeoffs between hydrogen yield (mole H2/mole CH4), hydrogen production rate (kg of H2/h), allowable CO emissions, and exhaust gas temperature for other applications such as gas turbine.

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Section: Numerical Modelmentioning

confidence: 99%

Performance analysis of a membrane‐based reformer‐combustor reactor for hydrogen generation

Sanusi

Mokheimer

2018

Int J Energy Res

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“…With the adoption of these techniques, gas turbine-based combined cycles have reported efficiencies of over 60%. 18,19 To further exploit the possibilities of enhancing the efficiency through increased TIT, researchers have put up the ideas of novel materials for blades. These materials include refractory metal alloys, metal matrix composites (MMCs), and ceramic matrix composites (CMCs).…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics of CMC bladed marine gas turbine-LM 2500: Effect of cycle operating parameters

Rathore

Kar

Sanjay

2022

International Journal of Engine Research

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Recent developments in ceramic-matrix composites and their successful use in combustor liners and shrouds have generated interest among researchers to adopt these materials in rotating gas turbine blades, especially in the first stages of high-pressure turbines where gas temperatures are highest. CMC blades have the potential of being retrofitted to replace superalloy turbine blades in operating gas turbines. In this paper, a comparative study on the thermodynamic performance of a marine gas turbine engine, LM 2500, featuring directionally solidified nickel superalloy blades versus novel CMC blades in the high-pressure turbine sections has been reported. Mathematical modeling of the gas turbine cycle components has been developed and then coded in C++ language. The effects of turbine inlet temperature on thermodynamic efficiencies, coolant mass flow rates, and work ratios on the two systems have been analyzed. Finally, the exergy analysis of the systems’ components has been done to identify the benefits of adopting CMC blades in the LM 2500 system. It has been observed that when compared to the directionally solidified bladed turbine system, the projected first law efficiency of CMC bladed LM 2500 gas turbines can be enhanced over 7% (from 34.17% to 41.21%). The projected work ratio can be improved by over 16% (from 0.49 to 0.57) at the turbine inlet temperature of 1725 K.

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“…The turbine inlet temperature has a predominant effect on the gas turbine efficiency and power output. In today's gas turbine industry, the gas turbine air inlet temperatures can be as high as 1600-2000 • C [2,3], which is much higher than the melting temperature of turbine blade and nozzle guide vane materials. Thus, beyond the protection from proper blade coating, the delicate internal cooling [4] and external film cooling [5] designs are used to cool the turbine blade and vane and protect them from damage.…”

Section: Introductionmentioning

confidence: 99%

Near-Field Simulations of Film Cooling with a Modified DES Model

Yavuzkurt

2020

Inventions

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Modeling the heat transfer characteristics of highly turbulent flow in gas turbine film cooling is important for providing better insights and engineering solutions to the film cooling problem. This study proposes a modified detached eddy simulation (DES) model for better film cooling simulations. First, spatially varying anisotropic eddy viscosity is found from the results of the large eddy simulation (LES) of film cooling. Then the correlation for eddy viscosity anisotropy ratio has been established based on the LES results and is proposed as the modification approach for the DES model. The modified DES model has been tested for the near-field film cooling simulations under different blowing ratios. Detailed comparisons of the centerline and 2D film cooling effectiveness indicate that the modified DES model enhances the spanwise spreading of the temperature field. The DES model leads to deviations of 62.4%, 39.8%, and 33.5% from the experimental centerline effectiveness under blowing ratios of 0.5, 1.0, and 1.5, respectively, while the modified DES reduces the deviations to 51.5%, 26.7%, and 28.9%. The modified DES model provides a promising approach for film cooling numerical simulations. It embraces the advantage of LES in resolving detailed vortical structure dynamics with a moderate computational cost. It also significantly improves the original DES model on the spanwise counter rotating vortex pair (CRVP) spreading, mixing, and effectiveness prediction.

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Development of Key Technologies for the Next Generation High Temperature Gas Turbine

Cited by 8 publications

References 0 publications

Performance analysis of a membrane‐based reformer‐combustor reactor for hydrogen generation

Performance analysis of a membrane‐based reformer‐combustor reactor for hydrogen generation

Thermodynamics of CMC bladed marine gas turbine-LM 2500: Effect of cycle operating parameters

Near-Field Simulations of Film Cooling with a Modified DES Model

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