The Experts below are selected from a list of 25641 Experts worldwide ranked by ideXlab platform
Chakib Bouallou - One of the best experts on this subject based on the ideXlab platform.
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Reforming natural gas for CO_2 pre-combustion capture in combined Cycle Power Plant
Clean Technologies and Environmental Policy, 2009Co-Authors: Jean-marc Amann, Mohamed Kanniche, Chakib BouallouAbstract:The aim of this study is to assess the conversion of a natural gas combined Cycle Power Plant (NGCC) using an advanced gas turbine (GE9H) for CO_2 pre-combustion capture. The natural gas is reformed in an auto-thermal reformer (ATR) either with pure oxygen or with air. After water-shift conversion of CO into CO_2 and physical CO_2 recovery, the synthesis gas contains a high fraction of H_2. It is diluted with N_2 and steam to lower its low heating value (LHV) for NO_ X emission control. Oxygen purity and reforming pressure have little impact on the performances. High-pressure reforming is preferred to reduce the process size. Air reforming results in a slightly higher efficiency but in a bigger process too. The CO_2 recovery rate has a big impact on the Power Plant efficiency since a lot of steam is required to lower the heating value (LHV) of the synthesis gas leaving the recovery process. Two values of LHV have been assessed. Steam consumption for natural gas reforming and synthesis gas dilution are the main consuming elements.
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Reforming natural gas for CO2 pre-combustion capture in combined Cycle Power Plant
Clean Technologies and Environmental Policy, 2009Co-Authors: Jean-marc Amann, Mohamed Kanniche, Chakib BouallouAbstract:The aim of this study is to assess the conversion of a natural gas combined Cycle Power Plant (NGCC) using an advanced gas turbine (GE9H) for CO2 pre-combustion capture. The natural gas is reformed in an auto-thermal reformer (ATR) either with pure oxygen or with air. After water-shift conversion of CO into CO2 and physical CO2 recovery, the synthesis gas contains a high fraction of H2. It is diluted with N2 and steam to lower its low heating value (LHV) for NOX emission control. Oxygen purity and reforming pressure have little impact on the performances. High-pressure reforming is preferred to reduce the process size. Air reforming results in a slightly higher efficiency but in a bigger process too. The CO2 recovery rate has a big impact on the Power Plant efficiency since a lot of steam is required to lower the heating value (LHV) of the synthesis gas leaving the recovery process. Two values of LHV have been assessed. Steam consumption for natural gas reforming and synthesis gas dilution are the main con- suming elements.
Iacopo Guaiatelli - One of the best experts on this subject based on the ideXlab platform.
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Techno-economic analysis of gas turbine inlet air cooling for combined Cycle Power Plant for different climatic conditions
Applied Thermal Engineering, 2015Co-Authors: Giovanna Barigozzi, Carolina Gritti, A. Perdichizzi, Iacopo GuaiatelliAbstract:This paper reports on a techno-economical parametric analysis of an inlet air cooling system applied to an aero-derivative Gas Turbine (GT) for a combined Cycle Power Plant (CC). The system is based on a cold water thermal storage charged nighttime by mechanical chillers; chilled water is used in the hottest day hours to cool inlet air to the compressor. Three cases have been analyzed, supposing the Plant operating in different sites, Phoenix (AZ-USA), New Orleans (LA-USA) and Abu Dhabi (UAE), characterized by quite different climatic conditions. Particular attention was paid to the influence of storage volume and heat exchanger sizing on both energetic and economic performances. Results have been obtained by a numerical code specifically developed to size the inlet air cooling system and to model the whole Power Plant behavior over the entire year on one hour basis. A 55 MWe combined Cycle Power Plant with a GE LM6000 gas turbine was assumed as a reference case. Operational hours and Power output augmentation were higher in hotter climates; wet climates required huge thermal storages, thus increasing the investment cost. The best techno-economic performance is attained for sites with high temperature combined with low relative humidity, typical of desert areas. The parametric analysis showed that the size of cooling storage is a very important parameter for the economical revenue.
Jean-marc Amann - One of the best experts on this subject based on the ideXlab platform.
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Reforming natural gas for CO_2 pre-combustion capture in combined Cycle Power Plant
Clean Technologies and Environmental Policy, 2009Co-Authors: Jean-marc Amann, Mohamed Kanniche, Chakib BouallouAbstract:The aim of this study is to assess the conversion of a natural gas combined Cycle Power Plant (NGCC) using an advanced gas turbine (GE9H) for CO_2 pre-combustion capture. The natural gas is reformed in an auto-thermal reformer (ATR) either with pure oxygen or with air. After water-shift conversion of CO into CO_2 and physical CO_2 recovery, the synthesis gas contains a high fraction of H_2. It is diluted with N_2 and steam to lower its low heating value (LHV) for NO_ X emission control. Oxygen purity and reforming pressure have little impact on the performances. High-pressure reforming is preferred to reduce the process size. Air reforming results in a slightly higher efficiency but in a bigger process too. The CO_2 recovery rate has a big impact on the Power Plant efficiency since a lot of steam is required to lower the heating value (LHV) of the synthesis gas leaving the recovery process. Two values of LHV have been assessed. Steam consumption for natural gas reforming and synthesis gas dilution are the main consuming elements.
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Reforming natural gas for CO2 pre-combustion capture in combined Cycle Power Plant
Clean Technologies and Environmental Policy, 2009Co-Authors: Jean-marc Amann, Mohamed Kanniche, Chakib BouallouAbstract:The aim of this study is to assess the conversion of a natural gas combined Cycle Power Plant (NGCC) using an advanced gas turbine (GE9H) for CO2 pre-combustion capture. The natural gas is reformed in an auto-thermal reformer (ATR) either with pure oxygen or with air. After water-shift conversion of CO into CO2 and physical CO2 recovery, the synthesis gas contains a high fraction of H2. It is diluted with N2 and steam to lower its low heating value (LHV) for NOX emission control. Oxygen purity and reforming pressure have little impact on the performances. High-pressure reforming is preferred to reduce the process size. Air reforming results in a slightly higher efficiency but in a bigger process too. The CO2 recovery rate has a big impact on the Power Plant efficiency since a lot of steam is required to lower the heating value (LHV) of the synthesis gas leaving the recovery process. Two values of LHV have been assessed. Steam consumption for natural gas reforming and synthesis gas dilution are the main con- suming elements.
Giovanna Barigozzi - One of the best experts on this subject based on the ideXlab platform.
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Techno-economic analysis of gas turbine inlet air cooling for combined Cycle Power Plant for different climatic conditions
Applied Thermal Engineering, 2015Co-Authors: Giovanna Barigozzi, Carolina Gritti, A. Perdichizzi, Iacopo GuaiatelliAbstract:This paper reports on a techno-economical parametric analysis of an inlet air cooling system applied to an aero-derivative Gas Turbine (GT) for a combined Cycle Power Plant (CC). The system is based on a cold water thermal storage charged nighttime by mechanical chillers; chilled water is used in the hottest day hours to cool inlet air to the compressor. Three cases have been analyzed, supposing the Plant operating in different sites, Phoenix (AZ-USA), New Orleans (LA-USA) and Abu Dhabi (UAE), characterized by quite different climatic conditions. Particular attention was paid to the influence of storage volume and heat exchanger sizing on both energetic and economic performances. Results have been obtained by a numerical code specifically developed to size the inlet air cooling system and to model the whole Power Plant behavior over the entire year on one hour basis. A 55 MWe combined Cycle Power Plant with a GE LM6000 gas turbine was assumed as a reference case. Operational hours and Power output augmentation were higher in hotter climates; wet climates required huge thermal storages, thus increasing the investment cost. The best techno-economic performance is attained for sites with high temperature combined with low relative humidity, typical of desert areas. The parametric analysis showed that the size of cooling storage is a very important parameter for the economical revenue.
Onkar Singh - One of the best experts on this subject based on the ideXlab platform.
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exergy analysis of dual pressure hrsg for different dead states and varying steam generation states in gas steam combined Cycle Power Plant
Applied Thermal Engineering, 2016Co-Authors: Meeta Sharma, Onkar SinghAbstract:Abstract This paper deals with exergy analysis of a dual pressure (DP) heat recovery steam generator (HRSG) having steam generation at high pressure (HP) and low pressure (LP) in the range of 50–70 bar and 2–6 bar respectively in the gas/steam combined Cycle Power Plant for varying dead states. The in-operation Plant data for this study are taken from a gas/steam combined Cycle Power Plant at Auraiya (U.P.), India. Results have been obtained for exergy loss and exergy efficiency with varying dead state temperatures for different HP and LP steam generation states in different sections of HRSG. The exergy analysis for chosen conditions/parameters helps in locating the particular sections of the HRSG having maximum exergy loss. It is found that at varying steam generation pressures the HP and LP super heater sections and at higher dead state temperatures the HP evaporator are found to act as major source of irreversibilities. The results obtained are useful in finding the thermodynamic states that will help in reducing the exergy destruction for enhancing HRSG performance which eventually improves the efficiency of combined Cycle Power Plants.
