The Experts below are selected from a list of 237 Experts worldwide ranked by ideXlab platform

Joseph Lawton - One of the best experts on this subject based on the ideXlab platform.

  • Development and Testing of a Gas Turbine Engine Combustion Air Inlet Protection Shroud for the USMC Amphibious Combat Vehicle
    Volume 1: Aircraft Engine; Fans and Blowers; Marine, 2018
    Co-Authors: Thomai Gastopoulos, Patricia Mcginn, Joseph Lawton
    Abstract:

    The Marine Corps Systems Command is evaluating alternative propulsion systems to achieve high water speed for the future USMC Amphibious Combat Vehicle (ACV). A gas turbine engine is one of the propulsion systems evaluated. The primary risk of operating a gas turbine engine in the ACV is power loss due to the ingestion of marine contaminants such as saltwater mist in the Air, saltwater spray generated from the vehicle operation, green water wash caused by the operation of the vehicle in the surf zone or in rough seas, and hard particles such as sand present in the marine environment. The Auxiliary Ships and New Acquisition Support Branch (Code 425) of the Naval Surface Warfare Center, Philadelphia Division conducted a study to assist the Marine Corps Systems Command in assessing the feasibility of using a gas turbine engine as a propulsion system on future USMC ACVs. The study was focused on developing and testing a gas turbine intake solution for the ACV that can remove saltwater from the intake Airstream of the notional 3,000 horsepower ACV engine. Code 425 developed a two-part solution for the intake of the ACV. The first part of the solution is the Combustion Air Protection Shroud (CAPS) located at the entrance of the engine intake and designed to protect the ACV engine from green water wash by elevating the intake above the ACV deck. The second part of the solution is a gas turbine intake filtration system located downstream of the intake shroud and designed to remove marine contaminants that enter the intake shroud. A reduced-scale model of the CAPS was designed by Code 425 in conjunction with Gibbs & Cox and tested at the Davidson Laboratory High Speed Test Basin at the Stevens Institute of Technology to determine the optimum extension height of the CAPS to protect the engine intake. This paper covers the design and testing of the CAPS. The results showed that a 2.67 ft. tall CAPS with selectively closeable Air intake louvers is sufficient to keep out saltwater from the ACV gas turbine engine.

  • Development and Testing of a Gas Turbine Engine Combustion Air Inlet Filtration System for the USMC Amphibious Combat Vehicle
    Volume 1: Aircraft Engine; Fans and Blowers; Marine; Honors and Awards, 2017
    Co-Authors: Thomai Gastopoulos, Joseph Lawton
    Abstract:

    The Auxiliary Ships and New Acquisition Support Branch (Code 425) of the Naval Surface Warfare Center, Philadelphia Division conducted a study to assist the Marine Corps Systems Command in assessing the feasibility of using a gas turbine engine as a propulsion system on future United States Marine Corps Amphibious Combat Vehicles (ACV). The study was focused on developing and testing a gas turbine intake solution for the ACV that can remove saltwater from the intake Airstream of a notional 3,000 horsepower ACV engine. Code 425 developed a two-part solution for the intake of the ACV. The first part of the solution is an intake shroud designed to elevate the intake to protect the engine from deck water wash. The second part of the solution is the Combustion Air Separation System (CASS), a gas turbine intake filtration system designed to remove marine contaminants that enter the intake. Code 425 tested a CASS prototype for its efficiency at removing saltwater spray and bulk water up to 10 gallons per minute. Test results showed that the CASS met each requirement and that an ACV intake system incorporating both the intake shroud and the CASS should protect the gas turbine engine from saltwater ingestion.

G Rubatto - One of the best experts on this subject based on the ideXlab platform.

  • thermodynamics applied to oxygen enrichment of Combustion Air
    Energy Conversion and Management, 2002
    Co-Authors: Giacomo M Bisio, Alessandro Bosio, G Rubatto
    Abstract:

    Abstract In order to reduce overall fuel consumption, or to partially substitute a “valuable” fuel with a poor one, in industrial heating, oxygen enrichment of Combustion Air can be very effective. For the second option, a general criterion is stated in this paper for examining the suitability of oxygen enrichment in single cases. The topic is particularly interesting, as for the first time, it is now feasible to produce oxygen enriched Air using permeable membranes on a commercial scale and with costs that are remarkably lower than those of other existing techniques. In this paper, the subject is investigated after some remarks about the definition of the “usable exergy” parameter, which was already proposed in previous papers by one of the authors and is here utilized for the above criterion.

Heng Chen - One of the best experts on this subject based on the ideXlab platform.

  • Performance evaluation of a new conceptual Combustion Air preheating system in a 1000 MW coal-fueled power plant
    Energy, 2020
    Co-Authors: Heng Chen, Zhen Qi, Gang Xu, Bin Li, Yongping Yang
    Abstract:

    Abstract An innovative design of Combustion Air preheating for large-scale coal-fueled power plants was proposed. Differing from the conventional Air preheating system using a rotary regenerative Air preheater, a cascade heating concept is adopted in the new configuration, where the Air obtains heat from the feedwater, circulating water and flue gas in several tubular heat exchangers, which significantly diminishes the Air leakages and the exergy destruction. The results of a detailed thermodynamic analysis show that, for a typical 1000 MW coal-fueled power plant, the net thermal efficiency increment can reach 0.49% points with a net heat rate reduction of 86.77 kJ/kWh, if the novel Air preheating design is adopted instead of the conventional one. This is because the exergy efficiency of the Air preheating process is promoted from 77.88% to 91.77% owing to the proposal, and the total exergy efficiency of the power plant rises by 0.48% points. The economic performance of the new design was examined as well, indicating that the dynamic payback period is only 5.30 years when the proposed Air preheating system is employed to replace the conventional one. This work may be beneficial for enhancing the Air preheating system and advancing coal-fired power production.

  • A Novel Combustion Air Preheating System in a Large-Scale Coal-Fired Power Unit
    ASME 2019 Power Conference, 2019
    Co-Authors: Heng Chen, Zhen Qi, Qiao Chen, Gang Xu
    Abstract:

    Abstract A novel hybrid system for Combustion Air heating, including flue gas cooling, Air heating and heat regeneration has been proposed. In the reformative scheme, the Air gains energy from four tubular heat exchangers and the flue gas releases heat in four tubular heat exchangers as well, instead of the rotary regenerative Air preheater (APH) that is used in the conventional scheme. Consequently, the temperature differences between the fluids during heat transmission can be diminished, and the mixing of the hot-cold primary Air and the severe leakages are avoided, which remarkably reduces the exergy destruction and enhances the thermal performance of the power unit. The new design was evaluated based on a 670 MW coal-fired supercritical power unit. The results show that the additional net power output of the power unit can reach 8.57 MW with a net efficiency promotion of 0.57 percentage points due to the novel configuration. And the energy saving mechanism of the proposed concept was revealed on grounds of the first and second laws of thermodynamics.

  • Improved Combustion Air preheating design using multiple heat sources incorporating bypass flue in large-scale coal-fired power unit
    Energy, 2019
    Co-Authors: Heng Chen, Zhen Qi, Qiao Chen, Gang Xu, Yunyun Wu, Yongping Yang
    Abstract:

    Abstract In this study, a new concept of the Combustion Air preheating system integrated with a bypass flue (BPF) configuration was put forward and its feasibility was evaluated. In the proposed system, the primary Air and secondary Air are heated separately with cascade heat exchange and the hot and cold bypassing primary Air mixing is avoided, which contributes to enhancing the Air preheating and waste heat utilization. Thermodynamic analysis was performed based on a typical 600 MW coal-fired power unit incorporating the new concept. The results indicated that owing to the proposed design, the power generation efficiency promotion reaches 0.78% (absolute value) with a standard coal consumption rate reduction of 5.52 g/kWh as compared to the reference unit, which are 0.14% (absolute value) higher and 0.94 g/kWh larger than those caused by the regular BPF retrofitting, respectively. The energy utilization is more rational in the new design according to the energy and exergy analysis, and the exergy efficiency of the primary Air heating process is improved from 75.75% (original design) or 79.62% (regular BPF design) to 84.46% due to the proposed concept. The volume and heat exchange area of the APH decline significantly as well in the modified system.

Gang Xu - One of the best experts on this subject based on the ideXlab platform.

  • Performance evaluation of a new conceptual Combustion Air preheating system in a 1000 MW coal-fueled power plant
    Energy, 2020
    Co-Authors: Heng Chen, Zhen Qi, Gang Xu, Bin Li, Yongping Yang
    Abstract:

    Abstract An innovative design of Combustion Air preheating for large-scale coal-fueled power plants was proposed. Differing from the conventional Air preheating system using a rotary regenerative Air preheater, a cascade heating concept is adopted in the new configuration, where the Air obtains heat from the feedwater, circulating water and flue gas in several tubular heat exchangers, which significantly diminishes the Air leakages and the exergy destruction. The results of a detailed thermodynamic analysis show that, for a typical 1000 MW coal-fueled power plant, the net thermal efficiency increment can reach 0.49% points with a net heat rate reduction of 86.77 kJ/kWh, if the novel Air preheating design is adopted instead of the conventional one. This is because the exergy efficiency of the Air preheating process is promoted from 77.88% to 91.77% owing to the proposal, and the total exergy efficiency of the power plant rises by 0.48% points. The economic performance of the new design was examined as well, indicating that the dynamic payback period is only 5.30 years when the proposed Air preheating system is employed to replace the conventional one. This work may be beneficial for enhancing the Air preheating system and advancing coal-fired power production.

  • A Novel Combustion Air Preheating System in a Large-Scale Coal-Fired Power Unit
    ASME 2019 Power Conference, 2019
    Co-Authors: Heng Chen, Zhen Qi, Qiao Chen, Gang Xu
    Abstract:

    Abstract A novel hybrid system for Combustion Air heating, including flue gas cooling, Air heating and heat regeneration has been proposed. In the reformative scheme, the Air gains energy from four tubular heat exchangers and the flue gas releases heat in four tubular heat exchangers as well, instead of the rotary regenerative Air preheater (APH) that is used in the conventional scheme. Consequently, the temperature differences between the fluids during heat transmission can be diminished, and the mixing of the hot-cold primary Air and the severe leakages are avoided, which remarkably reduces the exergy destruction and enhances the thermal performance of the power unit. The new design was evaluated based on a 670 MW coal-fired supercritical power unit. The results show that the additional net power output of the power unit can reach 8.57 MW with a net efficiency promotion of 0.57 percentage points due to the novel configuration. And the energy saving mechanism of the proposed concept was revealed on grounds of the first and second laws of thermodynamics.

  • Improved Combustion Air preheating design using multiple heat sources incorporating bypass flue in large-scale coal-fired power unit
    Energy, 2019
    Co-Authors: Heng Chen, Zhen Qi, Qiao Chen, Gang Xu, Yunyun Wu, Yongping Yang
    Abstract:

    Abstract In this study, a new concept of the Combustion Air preheating system integrated with a bypass flue (BPF) configuration was put forward and its feasibility was evaluated. In the proposed system, the primary Air and secondary Air are heated separately with cascade heat exchange and the hot and cold bypassing primary Air mixing is avoided, which contributes to enhancing the Air preheating and waste heat utilization. Thermodynamic analysis was performed based on a typical 600 MW coal-fired power unit incorporating the new concept. The results indicated that owing to the proposed design, the power generation efficiency promotion reaches 0.78% (absolute value) with a standard coal consumption rate reduction of 5.52 g/kWh as compared to the reference unit, which are 0.14% (absolute value) higher and 0.94 g/kWh larger than those caused by the regular BPF retrofitting, respectively. The energy utilization is more rational in the new design according to the energy and exergy analysis, and the exergy efficiency of the primary Air heating process is improved from 75.75% (original design) or 79.62% (regular BPF design) to 84.46% due to the proposed concept. The volume and heat exchange area of the APH decline significantly as well in the modified system.

Yongping Yang - One of the best experts on this subject based on the ideXlab platform.

  • Performance evaluation of a new conceptual Combustion Air preheating system in a 1000 MW coal-fueled power plant
    Energy, 2020
    Co-Authors: Heng Chen, Zhen Qi, Gang Xu, Bin Li, Yongping Yang
    Abstract:

    Abstract An innovative design of Combustion Air preheating for large-scale coal-fueled power plants was proposed. Differing from the conventional Air preheating system using a rotary regenerative Air preheater, a cascade heating concept is adopted in the new configuration, where the Air obtains heat from the feedwater, circulating water and flue gas in several tubular heat exchangers, which significantly diminishes the Air leakages and the exergy destruction. The results of a detailed thermodynamic analysis show that, for a typical 1000 MW coal-fueled power plant, the net thermal efficiency increment can reach 0.49% points with a net heat rate reduction of 86.77 kJ/kWh, if the novel Air preheating design is adopted instead of the conventional one. This is because the exergy efficiency of the Air preheating process is promoted from 77.88% to 91.77% owing to the proposal, and the total exergy efficiency of the power plant rises by 0.48% points. The economic performance of the new design was examined as well, indicating that the dynamic payback period is only 5.30 years when the proposed Air preheating system is employed to replace the conventional one. This work may be beneficial for enhancing the Air preheating system and advancing coal-fired power production.

  • Improved Combustion Air preheating design using multiple heat sources incorporating bypass flue in large-scale coal-fired power unit
    Energy, 2019
    Co-Authors: Heng Chen, Zhen Qi, Qiao Chen, Gang Xu, Yunyun Wu, Yongping Yang
    Abstract:

    Abstract In this study, a new concept of the Combustion Air preheating system integrated with a bypass flue (BPF) configuration was put forward and its feasibility was evaluated. In the proposed system, the primary Air and secondary Air are heated separately with cascade heat exchange and the hot and cold bypassing primary Air mixing is avoided, which contributes to enhancing the Air preheating and waste heat utilization. Thermodynamic analysis was performed based on a typical 600 MW coal-fired power unit incorporating the new concept. The results indicated that owing to the proposed design, the power generation efficiency promotion reaches 0.78% (absolute value) with a standard coal consumption rate reduction of 5.52 g/kWh as compared to the reference unit, which are 0.14% (absolute value) higher and 0.94 g/kWh larger than those caused by the regular BPF retrofitting, respectively. The energy utilization is more rational in the new design according to the energy and exergy analysis, and the exergy efficiency of the primary Air heating process is improved from 75.75% (original design) or 79.62% (regular BPF design) to 84.46% due to the proposed concept. The volume and heat exchange area of the APH decline significantly as well in the modified system.