The Experts below are selected from a list of 288 Experts worldwide ranked by ideXlab platform
Se Woong Kim - One of the best experts on this subject based on the ideXlab platform.
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effects of Turbine Inlet Temperature on performance of regenerative gas Turbine system with afterfogging
International Journal of Air-conditioning and Refrigeration, 2009Co-Authors: Kyoung Hoon Kim, Se Woong KimAbstract:Afterfogging of the regenerative gas Turbine system has an advantage over Inlet fogging in that the high outlet Temperature of air compressor makes the injection of more water and the recuperation of more exhaust heat possible. This study investigates the effects of Turbine Inlet Temperature (TIT) on the performance of regenerative gas Turbine system with afterfogging through a thermodynamic analysis model. For the standard ambient conditions and the water injection ratios up to 5%, the variation of system performance including the thermal efficiency is numerically analyzed with respect to the variations of TIT and pressure ratio. It is also analyzed how the maximum thermal efficiency, net specific work, and pressure ratio itself change with TIT at the peak points of thermal efficiency curve. All of these are found to increase almost linearly with the increases of both TIT and water injection ratio.
Kyoung Hoon Kim - One of the best experts on this subject based on the ideXlab platform.
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Comparative Thermodynamic Analysis of Gas Turbine Systems with Turbine Blade Film Cooling
Advanced Materials Research, 2012Co-Authors: Kyoung Hoon Kim, Kyoung Jin Kim, Chul Ho HanAbstract:Since the gas Turbine systems require active cooling to maintain high operating Temperature while avoiding a reduction in the system operating life, Turbine blade cooling is very important and essential but it may cause the performance losses in gas Turbine. This paper deals with the comparative thermodynamic analysis of gas Turbine system with and without regeneration by using the recently developed blade-cooling model when the Turbine blades are cooled by the method of film cooling. Special attention is paid to investigating the effects of system parameters such as pressure ratio and Turbine Inlet Temperature on the thermodynamic performance of the systems. In both systems the thermal efficiency increases with Turbine Inlet Temperature, but its effect is less sensitive in simpler system
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effects of Turbine Inlet Temperature on performance of regenerative gas Turbine system with afterfogging
International Journal of Air-conditioning and Refrigeration, 2009Co-Authors: Kyoung Hoon Kim, Se Woong KimAbstract:Afterfogging of the regenerative gas Turbine system has an advantage over Inlet fogging in that the high outlet Temperature of air compressor makes the injection of more water and the recuperation of more exhaust heat possible. This study investigates the effects of Turbine Inlet Temperature (TIT) on the performance of regenerative gas Turbine system with afterfogging through a thermodynamic analysis model. For the standard ambient conditions and the water injection ratios up to 5%, the variation of system performance including the thermal efficiency is numerically analyzed with respect to the variations of TIT and pressure ratio. It is also analyzed how the maximum thermal efficiency, net specific work, and pressure ratio itself change with TIT at the peak points of thermal efficiency curve. All of these are found to increase almost linearly with the increases of both TIT and water injection ratio.
Mustafizur Rahman - One of the best experts on this subject based on the ideXlab platform.
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Optimum Performance Enhancing Strategies of the Gas Turbine Based on The Effective Temperatures
MATEC Web of Conferences, 2016Co-Authors: Thamir K Ibrahim, Mustafizur Rahman, Obed M. Ali, Firdaus Basrawi, Rizalman MamatAbstract:Gas Turbines (GT) have come to play a significant role in distributed energy systems due to its multi-fuel capability, compact size and low environmental impact and reduced cost. Nevertheless, the low electrical efficiency, typically about 30% (LHV), is an important obstruction to the development of the GT plants. New strategies are designed for the GT plant, to increase the overall performance based on the operational modeling and optimization of GT power plants. The enhancing strategies effect on the GT power plant’s performance (with intercooler, two-shaft, reheat and regenerative) based on the real power plant of GT. An analysis based on thermodynamics has been carried out on the modifications of the cycle configurations’ enhancements. Then, the results showed the effect of the ambient and Turbine Inlet Temperatures on the performance of the GT plants to select an optimum strategy for the GT. The performance model code to compare the strategies of the GT plants were developed utilizing the MATLAB software. The results show that, the best thermal efficiency occurs in the intercooler-regenerative-reheated GT strategy (IRHGT); it decreased from 51.5 to 48%, when the ambient Temperature increased (from 273 to 327K). Furthermore, the thermal efficiency of the GT for the strategies without the regenerative increased (about 3.3%), while thermal efficiency for the strategies with regenerative increased (about 22%) with increased of the Turbine Inlet Temperature. The lower thermal efficiency occurs in the IHGT strategy, while the higher thermal efficiency occurs in the IRHGT strategy. However, the power output variation is more significant at a higher value of the Turbine Inlet Temperature. The simulation model gives a consistent result compared with Baiji GT plant. The extensive modeling performed in this study reveals that; the ambient Temperature and Turbine Inlet Temperature are strongly influenced on the performance of GT plant.
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Study on effective parameter of the triple-pressure reheat combined cycle performance
Thermal Science, 2013Co-Authors: Thamir K Ibrahim, Mustafizur RahmanAbstract:The thermodynamic analyses of the triple-pressure reheat combined cycle gas Turbines with duct burner are presented and discussed in this paper. The overall performance of a combined cycle gas Turbine power plant is influenced by the ambient Temperature, compression ratio and Turbine Inlet Temperature. These parameters affect the overall thermal efficiency, power output and the heat-rate. In this study a thermodynamic model was development on an existing actual combined cycle gas Turbine (CCGT) (In this case study, an effort has been made to enhance the performance of the CCGT through a parametric study using a thermodynamic analysis. The effect of ambient Temperature and operation parameter, including compression ratio and Turbine Inlet Temperature, on the overall performance of CCGT are investigated. The code of the performance model for CCGT power plant was developed utilizing the THERMOFLEX software. The simulating results show that the total power output and overall efficiency of a CCGT decrease with increase the ambient Temperature because increase the consumption power in the air compressor of a GT. The totals power of a CCGT decreases with increase the compression rate, while the overall efficiency of a CCGT increases with increase the compression ratio to 21, after that the overall efficiency will go down. Far there more the Turbine Inlet Temperature increases the both total power and overall efficiency increase, so the Turbine Inlet Temperature has a strong effect on the overall performance of CCGT power plant. Also the simulation model give a good result compared with MARAFIQ CCGT power plant. With these variables, the Turbine Inlet Temperature causes the greatest overall performance variation.
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Parametric study of a two-shaft gas Turbine cycle model of power plant
IOP Conference Series: Materials Science and Engineering, 2012Co-Authors: Thamir K Ibrahim, Mustafizur RahmanAbstract:In this paper, the parametric study of a two shafts gas Turbine cycle model of the power plant was proposed. The power output, compression work, specific fuel consumption and thermal efficiency are evaluated with respect to the cycle Temperature and compression ratio for a typical set of operating conditions. Two shafts gas Turbine cycle with realistic parameters is modeled. The computational model was developed utilizing the MATLAB codes. Turbine work found to be decreases as ambient Temperature increases as well as the thermal efficiency decreases. It can be seen that the thermal efficiency and power output increases linearly with increases of compression ratio while decreases of ambient Temperature. The power of the simulated two shafts gas Turbine reach to 135MW, which is higher than the simple gas-Turbine cycle (Baiji gas Turbine power plant, power < 131MW). The specific fuel consumption increases with increases of ambient Temperature as well as the lower Turbine Inlet Temperature. Even though at the lower Turbine Inlet Temperature is decrement the thermal efficiency dramatically and the power output increases linearly with increases of compression ratio and decreases the ambient Temperature.
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Thermal Impact of Operating Conditions on the Performance of a Combined Cycle Gas Turbine
Journal of Applied Research and Technology, 2012Co-Authors: Thamir K Ibrahim, Mustafizur RahmanAbstract:The combined cycle gas-Turbine (CCGT) power plant is a highly developed technology which generates electrical power at high efficiencies. The first law of thermodynamics is used for energy analysis of the performance of the CCGT plant. The effects of varying the operating conditions (ambient Temperature, compression ratio, Turbine Inlet Temperature, isentropic compressor and Turbine efficiencies, and mass flow rate of steam) on the performance of the CCGT (overall efficiency and total output power) were investigated. The programming of the performance model for CCGT was developed utilizing MATLAB software. The simulation results for CCGT show that the overall efficiency increases with increases in the compression ratio and Turbine Inlet Temperature and with decreases in ambient Temperature. The total power output increases with increases in the compression ratio, ambient Temperature, and Turbine Inlet Temperature. The peak overall efficiency was reached with a higher compression ratio and low ambient Temperature. The overall efficiencies for CCGT were very high compared to the thermal efficiency of GT plants. The overall thermal efficiency of the CCGT quoted was around 57%; hence, the compression ratios, ambient Temperature, Turbine Inlet Temperature, isentropic compressor and Turbine efficiencies, and mass flow rate of steam have a strong influence on the overall performance of the CCGT cycle.
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Parametric Simulation of Triple-Pressure Reheat Combined Cycle: A Case Study
Advanced Science Letters, 2012Co-Authors: Thamir K Ibrahim, Mustafizur RahmanAbstract:This paper presents a case study of the thermodynamic model on an existing actual combined-cycle gas Turbine (CCGT) (MARAFIQ power plant) with a triple pressure reheat heat recovery steam generator (HRSG) and duct burner. An effort has been made to enhance the performance of the CCGT through a parametric study using a thermodynamic analysis. The effect of the ambient Temperature and operation parameters, including compression ratio and Turbine Inlet Temperature on the overall performance of CCGT are investigated. The code of the performance model for CCGT power plant was developed utilizing the THERMOFLEX software. The simulating results show that the total power output and overall efficiency of a CCGT decrease with the increase of the ambient Temperature because of the increase the consumption power in the air compressor of a gas Turbine. The totals power of a CCGT decreases with the increase of the compression rate while the overall efficiency of a CCGT increases with the increase of the compression ratio to 21, after that the overall efficiency will go down. The Turbine Inlet Temperature also increases both total power and overall efficiency increase. It is concluded that the Turbine Inlet Temperature has a strong effect on the overall performance of CCGT power plant. The simulation model gives a good result compared with MARAFIQ CCGT power plant.
Ehsan Amiri Rad - One of the best experts on this subject based on the ideXlab platform.
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Introducing an optimum gas Turbine Inlet Temperature (TIT) based on a 4E analysis: a case study of northeastern Iran
Journal of Thermal Analysis and Calorimetry, 2020Co-Authors: Parisa Kazemiani-najafabadi, Ehsan Amiri RadAbstract:Determining the maximum Temperature of gas Turbine is one of the challenges in energy conversion to achieve the suitable performance of gas Turbine systems. For this purpose, based on the energy, exergy, environmental, and economic (4E) analyses, the effects of changing Turbine Inlet Temperature (TIT) on a gas Turbine power plant in northeastern Iran were studied. The results showed that increasing TIT enhanced net power and efficiency, so that increasing TIT about 10 K enhanced net power by 1.7%. Of course, on the other side, higher TIT increases the NOx emissions and the cost of materials and alloys. Therefore, the results indicated that higher TIT may not be necessarily more suitable. To find an optimal Temperature, a price objective function was introduced in which the costs of power generation, net power, efficiency, and environmental taxes were effective. Finally, for the investigated power plant, the optimum TIT of 1328 K was introduced in which the cost of power generation could be minimized by about 0.115 $/kWh. Graphic abstract
Thamir K Ibrahim - One of the best experts on this subject based on the ideXlab platform.
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Optimum Performance Enhancing Strategies of the Gas Turbine Based on The Effective Temperatures
MATEC Web of Conferences, 2016Co-Authors: Thamir K Ibrahim, Mustafizur Rahman, Obed M. Ali, Firdaus Basrawi, Rizalman MamatAbstract:Gas Turbines (GT) have come to play a significant role in distributed energy systems due to its multi-fuel capability, compact size and low environmental impact and reduced cost. Nevertheless, the low electrical efficiency, typically about 30% (LHV), is an important obstruction to the development of the GT plants. New strategies are designed for the GT plant, to increase the overall performance based on the operational modeling and optimization of GT power plants. The enhancing strategies effect on the GT power plant’s performance (with intercooler, two-shaft, reheat and regenerative) based on the real power plant of GT. An analysis based on thermodynamics has been carried out on the modifications of the cycle configurations’ enhancements. Then, the results showed the effect of the ambient and Turbine Inlet Temperatures on the performance of the GT plants to select an optimum strategy for the GT. The performance model code to compare the strategies of the GT plants were developed utilizing the MATLAB software. The results show that, the best thermal efficiency occurs in the intercooler-regenerative-reheated GT strategy (IRHGT); it decreased from 51.5 to 48%, when the ambient Temperature increased (from 273 to 327K). Furthermore, the thermal efficiency of the GT for the strategies without the regenerative increased (about 3.3%), while thermal efficiency for the strategies with regenerative increased (about 22%) with increased of the Turbine Inlet Temperature. The lower thermal efficiency occurs in the IHGT strategy, while the higher thermal efficiency occurs in the IRHGT strategy. However, the power output variation is more significant at a higher value of the Turbine Inlet Temperature. The simulation model gives a consistent result compared with Baiji GT plant. The extensive modeling performed in this study reveals that; the ambient Temperature and Turbine Inlet Temperature are strongly influenced on the performance of GT plant.
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Study on effective parameter of the triple-pressure reheat combined cycle performance
Thermal Science, 2013Co-Authors: Thamir K Ibrahim, Mustafizur RahmanAbstract:The thermodynamic analyses of the triple-pressure reheat combined cycle gas Turbines with duct burner are presented and discussed in this paper. The overall performance of a combined cycle gas Turbine power plant is influenced by the ambient Temperature, compression ratio and Turbine Inlet Temperature. These parameters affect the overall thermal efficiency, power output and the heat-rate. In this study a thermodynamic model was development on an existing actual combined cycle gas Turbine (CCGT) (In this case study, an effort has been made to enhance the performance of the CCGT through a parametric study using a thermodynamic analysis. The effect of ambient Temperature and operation parameter, including compression ratio and Turbine Inlet Temperature, on the overall performance of CCGT are investigated. The code of the performance model for CCGT power plant was developed utilizing the THERMOFLEX software. The simulating results show that the total power output and overall efficiency of a CCGT decrease with increase the ambient Temperature because increase the consumption power in the air compressor of a GT. The totals power of a CCGT decreases with increase the compression rate, while the overall efficiency of a CCGT increases with increase the compression ratio to 21, after that the overall efficiency will go down. Far there more the Turbine Inlet Temperature increases the both total power and overall efficiency increase, so the Turbine Inlet Temperature has a strong effect on the overall performance of CCGT power plant. Also the simulation model give a good result compared with MARAFIQ CCGT power plant. With these variables, the Turbine Inlet Temperature causes the greatest overall performance variation.
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Parametric study of a two-shaft gas Turbine cycle model of power plant
IOP Conference Series: Materials Science and Engineering, 2012Co-Authors: Thamir K Ibrahim, Mustafizur RahmanAbstract:In this paper, the parametric study of a two shafts gas Turbine cycle model of the power plant was proposed. The power output, compression work, specific fuel consumption and thermal efficiency are evaluated with respect to the cycle Temperature and compression ratio for a typical set of operating conditions. Two shafts gas Turbine cycle with realistic parameters is modeled. The computational model was developed utilizing the MATLAB codes. Turbine work found to be decreases as ambient Temperature increases as well as the thermal efficiency decreases. It can be seen that the thermal efficiency and power output increases linearly with increases of compression ratio while decreases of ambient Temperature. The power of the simulated two shafts gas Turbine reach to 135MW, which is higher than the simple gas-Turbine cycle (Baiji gas Turbine power plant, power < 131MW). The specific fuel consumption increases with increases of ambient Temperature as well as the lower Turbine Inlet Temperature. Even though at the lower Turbine Inlet Temperature is decrement the thermal efficiency dramatically and the power output increases linearly with increases of compression ratio and decreases the ambient Temperature.
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Thermal Impact of Operating Conditions on the Performance of a Combined Cycle Gas Turbine
Journal of Applied Research and Technology, 2012Co-Authors: Thamir K Ibrahim, Mustafizur RahmanAbstract:The combined cycle gas-Turbine (CCGT) power plant is a highly developed technology which generates electrical power at high efficiencies. The first law of thermodynamics is used for energy analysis of the performance of the CCGT plant. The effects of varying the operating conditions (ambient Temperature, compression ratio, Turbine Inlet Temperature, isentropic compressor and Turbine efficiencies, and mass flow rate of steam) on the performance of the CCGT (overall efficiency and total output power) were investigated. The programming of the performance model for CCGT was developed utilizing MATLAB software. The simulation results for CCGT show that the overall efficiency increases with increases in the compression ratio and Turbine Inlet Temperature and with decreases in ambient Temperature. The total power output increases with increases in the compression ratio, ambient Temperature, and Turbine Inlet Temperature. The peak overall efficiency was reached with a higher compression ratio and low ambient Temperature. The overall efficiencies for CCGT were very high compared to the thermal efficiency of GT plants. The overall thermal efficiency of the CCGT quoted was around 57%; hence, the compression ratios, ambient Temperature, Turbine Inlet Temperature, isentropic compressor and Turbine efficiencies, and mass flow rate of steam have a strong influence on the overall performance of the CCGT cycle.
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Parametric Simulation of Triple-Pressure Reheat Combined Cycle: A Case Study
Advanced Science Letters, 2012Co-Authors: Thamir K Ibrahim, Mustafizur RahmanAbstract:This paper presents a case study of the thermodynamic model on an existing actual combined-cycle gas Turbine (CCGT) (MARAFIQ power plant) with a triple pressure reheat heat recovery steam generator (HRSG) and duct burner. An effort has been made to enhance the performance of the CCGT through a parametric study using a thermodynamic analysis. The effect of the ambient Temperature and operation parameters, including compression ratio and Turbine Inlet Temperature on the overall performance of CCGT are investigated. The code of the performance model for CCGT power plant was developed utilizing the THERMOFLEX software. The simulating results show that the total power output and overall efficiency of a CCGT decrease with the increase of the ambient Temperature because of the increase the consumption power in the air compressor of a gas Turbine. The totals power of a CCGT decreases with the increase of the compression rate while the overall efficiency of a CCGT increases with the increase of the compression ratio to 21, after that the overall efficiency will go down. The Turbine Inlet Temperature also increases both total power and overall efficiency increase. It is concluded that the Turbine Inlet Temperature has a strong effect on the overall performance of CCGT power plant. The simulation model gives a good result compared with MARAFIQ CCGT power plant.
