A Computational Model of a Combined Cycle Power Generation Unit

Ramaprabhu, V.; Roy, R. P.

doi:10.1115/1.1789523

Cited by 12 publications

(5 citation statements)

References 11 publications

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“…Particularly, magnetic power devices such as power inductors usually occupies more than 35% of the total switching power converter size and are the hardest components to integrate on-chip with small size, low power losses, high inductance density, and other desirable performance metrics. Moreover, conventional magnetic components are the greatest source of power loss and the biggest barrier to performance increase and size reduction [1][2][3][4][5]. The losses in power inductor have both dc and ac components.…”

Section: Introductionmentioning

confidence: 99%

Retracted: “Multiscale Multiphysics Modeling, Analysis, Simulation, and Fabrication of Carbon Nanotube-Based Integrated Power Inductor for System On-Chip With Magnetic Cores” [ASME Journal of Energy Resources Technology, 2012, 134(4), p. 042002]

Mousa¹

2012

Journal of Energy Resources Technology

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The magnetics of power electronics has particular potential for improvement, as these components are typically the largest and volumétrica I ly inefficient in a power circuit. Nowadays, the trend is to develop multiscale multiphysics structures to yield peiformance characteristics favorable in power electronic devices and power converters' applications. As tire dimensions of materials are reduced to the nanometer realm, they often exhibit novel and interesting behavior, which constitute the basis for a new generation of electronic devices. Nanoparticles physical and chemical properties behavior is unique and peculiar compared to conventional or classical materials, for instance, silicon is a semiconductor wiiile silicon nanowire is a good conductor. Hence, the exploitation and exploration of nanotechnology is critical to achieving reliable nanometer-based power devices with small footprint and reduced power consumption, among others. Nanotechnology-based power inductor that utilizes hundledmultiwalled carbon nanotubes and thin magnetic plates as cores can provide higii-powerdensity, low-power-loss, and high performance in a small size for system on-chip (SoC). The bundled-multiwalled carbon nanotubes based power inductor with single-layer and three turns occupies an area of 0.1225 mm^ exhibits an inductance of 263 nH, a quality factor of 771 at 20MHz, and a dc rated current of 200 inA. The fabrication, design, analysis, multiscale multiphysics modeling, and simulation results oftiie bundled-multiwalled carbon nanotubes based power inductor are presented.

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Section: Introductionmentioning

confidence: 99%

Retracted: “Multiscale Multiphysics Modeling, Analysis, Simulation, and Fabrication of Carbon Nanotube-Based Integrated Power Inductor for System On-Chip With Magnetic Cores” [ASME Journal of Energy Resources Technology, 2012, 134(4), p. 042002]

Mousa¹

2012

Journal of Energy Resources Technology

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“…Using full gasification with coal or syngas for supplementary firing (cases 2 and 3, respectively) produces increased work output per kg of coal for a corresponding increase in T 6 , the gas turbine inlet temperature. The case without supplementary firing (case 4) has the highest specific net work output (18)(19)(20)(21)(22)(23) for the entire range of T 6 demonstrating that this case uses coal more effectively than the supplementary firing cases (1-3). For the T 6 range considered, the specific net work output for case 3 ranges from 16 to 21 MW, which is close to that for case 4, especially between T 6 5 1600 and 1700 K, which is within the maximum operating range for the latest gas turbines.…”

Section: Effect Of Gas Turbine Inlet Temperature (T 6 )mentioning

confidence: 97%

“…An overall fractional heat loss Q L of 3% of the heat input is assumed, and accounted for by setting Q L 5 0.97 [18].…”

Section: Cases 1 Andmentioning

confidence: 99%

Effect of supplementary firing options on cycle performance and CO₂emissions of an IGCC power generation system

Gnanapragasam

Reddy

Rosen

2009

Int. J. Energy Res.

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SUMMARYSupplementary firing is adopted in combined-cycle power plants to reheat low-temperature gas turbine exhaust before entering into the heat recovery steam generator. In an effort to identify suitable supplementary firing options in an integrated gasification combined-cycle (IGCC) power plant configuration, so as to use coal effectively, the performance is compared for three different supplementary firing options. The comparison identifies the better of the supplementary firing options based on higher efficiency and work output per unit mass of coal and lower CO 2 emissions. The three supplementary firing options with the corresponding fuel used for the supplementary firing are: (i) partial gasification with char, (ii) full gasification with coal and (iii) full gasification with syngas. The performance of the IGCC system with these three options is compared with an option of the IGCC system without supplementary firing. Each supplementary firing option also involves pre-heating of the air entering the gas turbine combustion chamber in the gas cycle and reheating of the low-pressure steam in the steam cycle. The effects on coal consumption and CO 2 emissions are analysed by varying the operating conditions such as pressure ratio, gas turbine inlet temperature, air pre-heat and supplementary firing temperature. The results indicate that more work output is produced per unit mass of coal when there is no supplementary firing. Among the supplementary firing options, the full gasification with syngas option produces the highest work output per unit mass of coal, and the partial gasification with char option emits the lowest amount of CO 2 per unit mass of coal. Based on the analysis, the most advantageous option for low specific coal consumption and CO 2 emissions is the supplementary firing case having full gasification with syngas as the fuel.

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“…Equation (5) is solved for f by an iterative procedure (Ramaprabhu and Roy, 2004). The excess air ratio is determined by the fuel coefficient.…”

Section: Combustion Chambermentioning

confidence: 99%

Thermodynamic analysis of an LNG fuelled combined cycle power plant with waste heat recovery and utilization system

Shi

Che

2007

Int. J. Energy Res.

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SUMMARYThis paper has proposed an improved liquefied natural gas (LNG) fuelled combined cycle power plant with a waste heat recovery and utilization system. The proposed combined cycle, which provides power outputs and thermal energy, consists of the gas/steam combined cycle, the subsystem utilizing the latent heat of spent steam from the steam turbine to vaporize LNG, the subsystem that recovers both the sensible heat and the latent heat of water vapour in the exhaust gas from the heat recovery steam generator (HRSG) by installing a condensing heat exchanger, and the HRSG waste heat utilization subsystem. The conventional combined cycle and the proposed combined cycle are modelled, considering mass, energy and exergy balances for every component and both energy and exergy analyses are conducted. Parametric analyses are performed for the proposed combined cycle to evaluate the effects of several factors, such as the gas turbine inlet temperature (TIT), the condenser pressure, the pinch point temperature difference of the condensing heat exchanger and the fuel gas heating temperature on the performance of the proposed combined cycle through simulation calculations. The results show that the net electrical efficiency and the exergy efficiency of the proposed combined cycle can be increased by 1.6 and 2.84% than those of the conventional combined cycle, respectively. The heat recovery per kg of flue gas is equal to 86.27 kJ s À1 . One MW of electric power for operating sea water pumps can be saved. The net electrical efficiency and the heat recovery ratio increase as the condenser pressure decreases. The higher heat recovery from the HRSG exit flue gas is achieved at higher gas TIT and at lower pinch point temperature of the condensing heat exchanger.

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A Computational Model of a Combined Cycle Power Generation Unit

Cited by 12 publications

References 11 publications

Retracted: “Multiscale Multiphysics Modeling, Analysis, Simulation, and Fabrication of Carbon Nanotube-Based Integrated Power Inductor for System On-Chip With Magnetic Cores” [ASME Journal of Energy Resources Technology, 2012, 134(4), p. 042002]

Retracted: “Multiscale Multiphysics Modeling, Analysis, Simulation, and Fabrication of Carbon Nanotube-Based Integrated Power Inductor for System On-Chip With Magnetic Cores” [ASME Journal of Energy Resources Technology, 2012, 134(4), p. 042002]

Effect of supplementary firing options on cycle performance and CO₂emissions of an IGCC power generation system

Thermodynamic analysis of an LNG fuelled combined cycle power plant with waste heat recovery and utilization system

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A Computational Model of a Combined Cycle Power Generation Unit

Cited by 12 publications

References 11 publications

Retracted: “Multiscale Multiphysics Modeling, Analysis, Simulation, and Fabrication of Carbon Nanotube-Based Integrated Power Inductor for System On-Chip With Magnetic Cores” [ASME Journal of Energy Resources Technology, 2012, 134(4), p. 042002]

Retracted: “Multiscale Multiphysics Modeling, Analysis, Simulation, and Fabrication of Carbon Nanotube-Based Integrated Power Inductor for System On-Chip With Magnetic Cores” [ASME Journal of Energy Resources Technology, 2012, 134(4), p. 042002]

Effect of supplementary firing options on cycle performance and CO2emissions of an IGCC power generation system

Thermodynamic analysis of an LNG fuelled combined cycle power plant with waste heat recovery and utilization system

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Effect of supplementary firing options on cycle performance and CO₂emissions of an IGCC power generation system