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B N Prasad - One of the best experts on this subject based on the ideXlab platform.

  • comparative performance analysis of cogeneration gas turbine cycle for different blade Cooling means
    International Journal of Thermal Sciences, 2009
    Co-Authors: Onkar Singh, B N Prasad
    Abstract:

    The paper compares the thermodynamic performance of MS9001 gas turbine based cogeneration cycle having a two-pressure heat recovery Steam generator (HRSG) for different blade Cooling means. The HRSG has a Steam drum generating Steam to meet coolant requirement, and a second Steam drum generates Steam for process heating. Gas turbine stage Cooling uses open loop Cooling or closed loop Cooling schemes. Internal convection Cooling, film Cooling and transpiration Cooling techniques employing Steam or air as coolants are considered for the performance evaluation of the cycle. Cogeneration cycle performance is evaluated using coolant flow requirements, plant specific work, fuel utilisation efficiency, power-to-heat-ratio, which are function of compressor pressure ratio and turbine inlet temperature, and process Steam drum pressure. The maximum and minimum values of power-to-heat ratio are found with Steam internal convection Cooling and air internal convection Cooling respectively whereas maximum and minimum values of fuel utilisation efficiency are found with Steam internal convection Cooling and closed loop Steam Cooling. The analysis is useful for power plant designers to select the optimum compressor pressure ratio, turbine inlet temperature, fuel utilisation efficiency, power-to-heat ratio, and appropriate Cooling means for a specified value of plant specific work and process heating requirement.

  • influence of different means of turbine blade Cooling on the thermodynamic performance of combined cycle
    Applied Thermal Engineering, 2008
    Co-Authors: Onkar Singh, B N Prasad
    Abstract:

    A comparative study of the influence of different means of turbine blade Cooling on the thermodynamic performance of combined cycle power plant is presented. Seven schemes involving air and Steam as coolants under open and closed loop Cooling techniques have been studied. The open loop incorporates the internal convection, film and transpiration Cooling techniques. Closed loop Cooling includes only internal convection Cooling. It has been found that closed loop Steam Cooling offers more specific work and consequently gives higher value of plant efficiency of about 60%, whereas open loop transpiration Steam Cooling, open loop Steam internal convection Cooling, transpiration air Cooling, film Steam Cooling, film air, and internal convection air Cooling have been found to yield lower values of plant efficiency in decreasing order as compared to closed loop Steam Cooling.

  • energy and exergy analysis of Steam cooled reheat gas Steam combined cycle
    Applied Thermal Engineering, 2007
    Co-Authors: Yadav Sanjay, Onkar Singh, B N Prasad
    Abstract:

    Abstract This paper deals with parametric energy and exergy analysis of reheat gas–Steam combined cycle using closed-loop-Steam-Cooling. Of the blade Cooling techniques, closed-loop-Steam-Cooling has been found to be superior to air-film Cooling. The reheat gas–Steam combined cycle plant with closed-loop-Steam-Cooling exhibits enhanced thermal efficiency (around 62%) and plant specific work as compared to basic Steam–gas combined cycle with air-film Cooling as well as closed-loop-Steam Cooling. Further, with closed-loop-Steam-Cooling, the plant efficiency, reaches an optimum value in higher range of compressor pressure ratio as compared to that in film air-Cooling. It has also been concluded that reheat pressure is an important design parameter and its optimum value gives maximum plant efficiency. Component-wise inefficiencies of Steam cooled-reheat gas–Steam combined cycle based on the second-law-model (exergy analysis) have been found to be the maximum in combustion-chamber (≈30%), followed by that in gas turbine (≈4%).

Onkar Singh - One of the best experts on this subject based on the ideXlab platform.

  • comparative performance analysis of cogeneration gas turbine cycle for different blade Cooling means
    International Journal of Thermal Sciences, 2009
    Co-Authors: Onkar Singh, B N Prasad
    Abstract:

    The paper compares the thermodynamic performance of MS9001 gas turbine based cogeneration cycle having a two-pressure heat recovery Steam generator (HRSG) for different blade Cooling means. The HRSG has a Steam drum generating Steam to meet coolant requirement, and a second Steam drum generates Steam for process heating. Gas turbine stage Cooling uses open loop Cooling or closed loop Cooling schemes. Internal convection Cooling, film Cooling and transpiration Cooling techniques employing Steam or air as coolants are considered for the performance evaluation of the cycle. Cogeneration cycle performance is evaluated using coolant flow requirements, plant specific work, fuel utilisation efficiency, power-to-heat-ratio, which are function of compressor pressure ratio and turbine inlet temperature, and process Steam drum pressure. The maximum and minimum values of power-to-heat ratio are found with Steam internal convection Cooling and air internal convection Cooling respectively whereas maximum and minimum values of fuel utilisation efficiency are found with Steam internal convection Cooling and closed loop Steam Cooling. The analysis is useful for power plant designers to select the optimum compressor pressure ratio, turbine inlet temperature, fuel utilisation efficiency, power-to-heat ratio, and appropriate Cooling means for a specified value of plant specific work and process heating requirement.

  • influence of different means of turbine blade Cooling on the thermodynamic performance of combined cycle
    Applied Thermal Engineering, 2008
    Co-Authors: Onkar Singh, B N Prasad
    Abstract:

    A comparative study of the influence of different means of turbine blade Cooling on the thermodynamic performance of combined cycle power plant is presented. Seven schemes involving air and Steam as coolants under open and closed loop Cooling techniques have been studied. The open loop incorporates the internal convection, film and transpiration Cooling techniques. Closed loop Cooling includes only internal convection Cooling. It has been found that closed loop Steam Cooling offers more specific work and consequently gives higher value of plant efficiency of about 60%, whereas open loop transpiration Steam Cooling, open loop Steam internal convection Cooling, transpiration air Cooling, film Steam Cooling, film air, and internal convection air Cooling have been found to yield lower values of plant efficiency in decreasing order as compared to closed loop Steam Cooling.

  • energy and exergy analysis of Steam cooled reheat gas Steam combined cycle
    Applied Thermal Engineering, 2007
    Co-Authors: Yadav Sanjay, Onkar Singh, B N Prasad
    Abstract:

    Abstract This paper deals with parametric energy and exergy analysis of reheat gas–Steam combined cycle using closed-loop-Steam-Cooling. Of the blade Cooling techniques, closed-loop-Steam-Cooling has been found to be superior to air-film Cooling. The reheat gas–Steam combined cycle plant with closed-loop-Steam-Cooling exhibits enhanced thermal efficiency (around 62%) and plant specific work as compared to basic Steam–gas combined cycle with air-film Cooling as well as closed-loop-Steam Cooling. Further, with closed-loop-Steam-Cooling, the plant efficiency, reaches an optimum value in higher range of compressor pressure ratio as compared to that in film air-Cooling. It has also been concluded that reheat pressure is an important design parameter and its optimum value gives maximum plant efficiency. Component-wise inefficiencies of Steam cooled-reheat gas–Steam combined cycle based on the second-law-model (exergy analysis) have been found to be the maximum in combustion-chamber (≈30%), followed by that in gas turbine (≈4%).

Uno Facchini - One of the best experts on this subject based on the ideXlab platform.

  • comparison between two gas turbine solutions to increase combined power plant efficiency
    Energy Conversion and Management, 2000
    Co-Authors: Carlo Carcasci, Uno Facchini
    Abstract:

    Abstract Significant research efforts are currently centered on developing advanced gas turbine systems for electric power generation applications. Gas–Steam combined cycles are often used to obtain a high efficiency power plant. Two innovative gas turbine technologies have recently been proposed for combined cycle applications. Two gas–Steam combined cycles using thermodynamic analysis are presented: a combined cycle with three pressure levels with reheat heat recovery boiler is used with two different gas turbine technologies (high pressure ratio and reheat against “H” technology). This analysis constitutes a comparison not only between two different constructive solutions but also between two different gas turbine (GT) techniques (reheat and GT Steam Cooling) and technologies (a consolidated and an advanced gas turbine technology) applied to a combined cycle.

A M Bassily - One of the best experts on this subject based on the ideXlab platform.

  • numerical cost optimization and irreversibility analysis of the triple pressure reheat Steam air cooled gt commercial combined cycle power plants
    Applied Thermal Engineering, 2012
    Co-Authors: A M Bassily
    Abstract:

    Abstract Steam-air Cooling of the gas turbine (GT) and optimization are important methods for enhancing the efficiency and power of the combined cycle power plants. A Steam-air cooled GT uses less air for GT Cooling; thus, allows more air to be available for the combustion process and increases output power significantly. In this paper, the commercial triple-pressure reheat Steam-air cooled GT combined cycles (The GE Stage 107H and Mitsubishi M501H commercial combined cycles) were presented, optimized relative to its operating parameters, and the irreversibilities of the components were analyzed to identify the magnitude and locations of such irreversibilities and discuss its causes. Constraints were set on many operating parameters such as air pressure ratio, the ratio of the Cooling Steam flow to the maximum available flow for Steam Cooling, and stack temperature. The net revenue and cycle efficiency were optimized at 10 different maximum values of turbine inlet temperature (TIT) using two different methods: the direct search and variable metric. The optimized cycles had better performance and lower irreversibilities for the main components than that for the commercial cycles. Optimizing the net revenue could result in an annual saving of about 29.2 million US dollars for a 400 MW power plant.

Carlo Carcasci - One of the best experts on this subject based on the ideXlab platform.

  • comparison between two gas turbine solutions to increase combined power plant efficiency
    Energy Conversion and Management, 2000
    Co-Authors: Carlo Carcasci, Uno Facchini
    Abstract:

    Abstract Significant research efforts are currently centered on developing advanced gas turbine systems for electric power generation applications. Gas–Steam combined cycles are often used to obtain a high efficiency power plant. Two innovative gas turbine technologies have recently been proposed for combined cycle applications. Two gas–Steam combined cycles using thermodynamic analysis are presented: a combined cycle with three pressure levels with reheat heat recovery boiler is used with two different gas turbine technologies (high pressure ratio and reheat against “H” technology). This analysis constitutes a comparison not only between two different constructive solutions but also between two different gas turbine (GT) techniques (reheat and GT Steam Cooling) and technologies (a consolidated and an advanced gas turbine technology) applied to a combined cycle.