Sensitivity analysis of STIG based combined cycle with dual pressure HRSG

Srinivas, T.; Gupta, A.V.S.S.K.S.; Reddy, Bale V.

doi:10.1016/j.ijthermalsci.2007.10.002

Cited by 24 publications

(10 citation statements)

References 16 publications

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“…The stack temperature or HRSG exit temperature rises with increase in pressure ratio and decreases with increase in GTIT. The total change in thermal efficiency is from 41% to 48% and the specific power from 0.35 MW to 0.67 MW with the variations in pressure ratio (7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18) and temperature (1100°C -1300°C). The CO 2 emissions are changed from 0.39 kg/kWh to 0.46 kg/kWh.…”

Section: Resultsmentioning

confidence: 99%

“…The current work shows from 0.4 to 0.46 kg/kWh with the variations in pressure and temperature. Figure 4 results the performance characteristics, CO 2 emissions and stack temperature with compressor pressure ratio (7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18) and GTIT (1100°C -1300°C) for a water Comparative studies of augmentation in combined cycle power plants T. Srinivas and B. V. Reddy injected CC plant. It reveals the significant influence of water injection on thermal efficiency and specific power of the plant.…”

Section: Resultsmentioning

confidence: 99%

“…The loss in efficiency due to steam injection is low (0.3%) compared to efficiency loss with water injection (1.5%). Figure 6 studies the role of compressor pressure ratio (7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18) and GTIT (1100°C -1300°C) on performance characteristics, CO 2 emissions and stack temperature with a supplementary firing located between gas turbine and HRSG. SF enriches the heat recovery for steam generation at HRSG from high temperature flue gas.…”

Section: Resultsmentioning

confidence: 99%

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Comparative studies of augmentation in combined cycle power plants

Srinivas

Reddy

2013

Int. J. Energy Res.

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SUMMARYThe attractive features of a combined cycle (CC) power plant are fuel flexibility, operational flexibility, higher efficiency and low emissions. The performance of five gas turbine‐steam turbine (GT‐ST) combined cycle power plants (four natural gas based plants and one biomass based plant) have been studied and the degree of augmentation has been compared. They are (i) combined cycle with natural gas (CC‐NG), (ii) combined cycle with water injection (CC‐WI), (iii) combined cycle with steam injection (CC‐SI), (iv) combined cycle with supplementary firing (CC‐SF) and (v) combined cycle with biomass gasification (CC‐BM). The plant performance and CO2 emissions are compared with a change in compressor pressure ratio and gas turbine inlet temperature (GTIT). The optimum pressure ratio for compressor is selected from maximum efficiency condition. The specific power, thermal efficiency and CO2 emissions of augmented power plants are compared with the CC‐NG power plant at the individual optimized pressure ratios in place of a common pressure ratio. The results show that the optimum pressure ratio is increased with water injection, steam injection, supplementary firing and biomass gasification. The specific power is increased in all the plants with a loss in thermal efficiency and rise in CO2 emissions compared to CC‐NG plant. Copyright © 2013 John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Comparative studies of augmentation in combined cycle power plants

Srinivas

Reddy

2013

Int. J. Energy Res.

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“…The major exergetic loss occurs in gas turbine combustion chamber in the order of 27·5 percent and the minor exergetic loss is in deaerator. With a steam injection in combustion chamber, this major exergetic loss can be decreased (Srinivas et al , 2008. Next to GTCC, considerable level of exergy is destroyed in compressor, gas turbine, HRSG and exhaust in the range of 2 to 3 percent.…”

Section: Resultsmentioning

confidence: 99%

Thermodynamic modelling and optimization of a dual pressure reheat combined power cycle

Srinivas

2010

Sadhana

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Heat recovery steam generator (HRSG) plays a key role on performance of combined cycle (CC). In this work, attention was focused on a dual pressure reheat (DPRH) HRSG to maximize the heat recovery and hence performance of CC. Deaerator, an essential open feed water heater in steam bottoming cycle was located to enhance the efficiency and remove the dissolved gasses in feedwater. Each of the heating section in HRSG is solved from the local flue gas condition with an aim of getting minimum possible temperature difference. For high performance, better conditions for compressor, HRSG sections, steam reheater and deaerator are developed. The CC system is optimized at a gas turbine inlet temperature of 1400 • C due to the present available technology of modern gas turbine blade cooling systems. The exergetic losses in CC system are compared with each other. The present DPRH HRSG model has been compared and validated with the plant and published data.

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“…In the literature, very often one may experience two definitions of the relative steam injection coefficient: first, related to the air mass flux, k = m s5b /ṁ a (according to [6,14,24] ) and the second, related to the fuel mass flux, β =ṁ s /ṁ f (according to [16,18,21]). …”

Section: Mathematical Model In the Cfm Codementioning

confidence: 99%

Power enhancement of the Brayton cycle by steam utilization

Jesionek¹,

Chrzczonowski²,

Ziółkowski³

et al. 2012

Archives of Thermodynamics

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The paper presents thermodynamic analysis of the gas-steam unit of the 65 MWe combined heat and power station. Numerical analyses of the station was performed for the nominal operation conditions determining the Brayton and combined cycle. Furthermore, steam utilization for the gas turbine propulsion in the Cheng cycle was analysed. In the considered modernization, steam generated in the heat recovery steam generator unit is directed into the gas turbine combustion chamber, resulting in the Brayton cycle power increase. Computational flow mechanics codes were used in the analysis of the thermodynamic and operational parameters of the unit.Keywords: Brayton cycle; Gas-steam unit; Cheng cycle; Numerical analysis; CHP Nomenclature h -specific enthalpy, kJ/kg k -relative steam flux coefficient

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Sensitivity analysis of STIG based combined cycle with dual pressure HRSG

Cited by 24 publications

References 16 publications

Comparative studies of augmentation in combined cycle power plants

Comparative studies of augmentation in combined cycle power plants

Thermodynamic modelling and optimization of a dual pressure reheat combined power cycle

Power enhancement of the Brayton cycle by steam utilization

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