The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform

Alex Morrison - One of the best experts on this subject based on the ideXlab platform.

  • Utility Perspective of Selecting Air Filter for Simple-Cycle, Heavy-Duty Combustion Turbines
    Journal of Engineering for Gas Turbines and Power, 1993
    Co-Authors: James W. Lyons, Alex Morrison
    Abstract:

    The combustion turbines evaluated for this study range in size (nominal) from 80 MW to 100 MW and operate at a compression ratio between 10 and 14. Under these conditions the compressor ingests about 500,000 to 725,000 cubic feet of air per minute for its rated output. With this volume of air, even low concentrations of contaminants can result in a significant total amount of contaminants entering the unit, which may cause compressor erosion, fouling, and foreign object damage in the compressor section and cooling air passage blockage, locking of turbine blade roots, and hot corrosion or sulfidation in the turbine section. Adequate protection against the above-mentioned degradation or damage due to poor air quality may be obtained by using properly designed air filters. An inadequate filter system or total lack of one results in a reduction in power and efficiency over the life of the unit and may significantly decrease the intervals between maintenance and thereby increase the cost of maintenance. Consideration should be given to adding an air inlet filter when or after the combustion turbine without air filter is overhauled to reduce future maintenance costs. This study investigates the need for an inlet air filtration system for Simple-Cycle, heavy-duty combustion turbines from a cost/benefit and operation standpoint. Options for inlet air filters include a self-cleaning pulse type filter, a surface loading cartridge filter without pulse feature, and a three-stage depth loading type media type filter. Benefits are determined by estimates of improvements in performance and effects on the combustion turbine’s longevity and maintenance.

  • Utility Perspective of Selecting Air Filter for Simple-Cycle, Heavy-Duty Combustion Turbines
    Volume 4: Heat Transfer; Electric Power; Industrial and Cogeneration, 1992
    Co-Authors: James W. Lyons, Alex Morrison
    Abstract:

    The combustion turbines evaluated for this study range in size (nominal) from 80 MW to 100 MW and operate at a compression ratio between 10 and 14. Under these conditions the compressor ingests about 500,000 to 725,000 cubic feet of air per minute for its rated output. With this volume of air, even low concentrations of contaminants can result in a significant total amount of contaminants entering the unit, which may cause compressor erosion, fouling, and foreign object damage in the compressor section and cooling air passage blockage, locking of turbine blade roots, and hot corrosion or sulfidation in the turbine section. Adequate protection against the above mentioned degradation or damage due to poor air quality may be obtained by using properly designed air filters. An inadequate filter system or having no filter system results in a reduction in power and efficiency over the life of the unit and may significantly decrease the intervals between maintenance and thereby increase the cost of maintenance. Consideration should be given to adding an air inlet filter when or after the combustion turbine without air filter is overhauled to reduce future maintenance costs. This study investigates the need for an inlet air filtration system for the Simple-Cycle, heavy-duty combustion turbines from a cost/benefit and operation standpoint. Options for inlet air filters include a self-cleaning pulse type filter, a surface loading cartridge filter without pulse feature, and a three-stage depth loading type media type filter. Benefits are determined by estimates of improvements in performance and effects on the combustion turbine’s longevity and maintenance.

  • Utility Perspective of Selecting Air Filter for Simple-Cycle, Heavy-Duty Combustion Turbines
    Volume 4: Heat Transfer; Electric Power; Industrial and Cogeneration, 1992
    Co-Authors: James W. Lyons, Alex Morrison
    Abstract:

    The combustion turbines evaluated for this study range in size (nominal) from 80 MW to 100 MW and operate at a compression ratio between 10 and 14. Under these conditions the compressor ingests about 500,000 to 725,000 cubic feet of air per minute for its rated output. With this volume of air, even low concentrations of contaminants can result in a significant total amount of contaminants entering the unit, which may cause compressor erosion, fouling, and foreign object damage in the compressor section and cooling air passage blockage, locking of turbine blade roots, and hot corrosion or sulfidation in the turbine section. Adequate protection against the above mentioned degradation or damage due to poor air quality may be obtained by using properly designed air filters. An inadequate filter system or having no filter system results in a reduction in power and efficiency over the life of the unit and may significantly decrease the intervals between maintenance and thereby increase the cost of maintenance. Consideration should be given to adding an air inlet filter when or after the combustion turbine without air filter is overhauled to reduce future maintenance costs.This study investigates the need for an inlet air filtration system for the Simple-Cycle, heavy-duty combustion turbines from a cost/benefit and operation standpoint. Options for inlet air filters include a self-cleaning pulse type filter, a surface loading cartridge filter without pulse feature, and a three-stage depth loading type media type filter. Benefits are determined by estimates of improvements in performance and effects on the combustion turbine’s longevity and maintenance.Copyright © 1992 by ASME

F.j. Wang - One of the best experts on this subject based on the ideXlab platform.

  • integration of steam injection and inlet air cooling for a gas turbine generation system
    Energy Conversion and Management, 2004
    Co-Authors: F.j. Wang, Jiunnshyang Chiou
    Abstract:

    Abstract The temperature of exhaust gases from Simple Cycle gas turbine generation sets (GENSETs) is usually very high (around 500 °C), and a heat recovery steam generator (HRSG) is often used to recover the energy from the exhaust gases and generate steam. The generated steams can be either used for many useful processes (heating, drying, separation etc.) or used back in the power generation system for enhancing power generation capacity and efficiency. Two well-proven techniques, namely steam injection gas turbine (STIG) and inlet air cooling (IAC) are very effective features that can use the generated steam to improve the power generation capacity and efficiency. Since the energy level of the generated steam needed for steam injection is different from that needed by an absorption chiller to cool the inlet air, a proper arrangement is required to implement both the STIG and the IAC features into the Simple Cycle GENSET. In this study, a computer code was developed to simulate a Taipower’s Frame 7B Simple Cycle GENSET. Under the condition of local summer weather, the benefits obtained from the system implementing both STIG and IAC features are more than a 70% boost in power and 20.4% improvement in heat rate.

  • Performance improvement for a Simple Cycle gas turbine GENSET--a retrofitting example
    Applied Thermal Engineering, 2002
    Co-Authors: F.j. Wang, J.s. Chiou
    Abstract:

    Due to the serious power shortage in Taiwan, many Simple Cycle gas turbine generation sets (GENSETs) that were originally designated to serve as peak load units are forced to operate continuously during the entire summer season. The retrofitting projects have been seriously considered to convert these GENSETs (which have the advantage of fast startup, but suffer from low power output and thermal efficiency at high ambient temperature) into more advanced Cycle units with higher efficiency and higher output. Among many proven technologies, such as inlet air cooling, intercooling, regeneration, reheating and steaminjection gas turbine (STIG) etc., STIG is found to be one of the most effective in boosting both the output capacity and thermal efficiency. The results from computer simulation indicated that the retrofitting of existing GE Frame 6B Simple Cycle unit into STIG Cycle can boost the output from about 38 to 50 MW, while the generation efficiency can be increased from about 30% to 40%. Besides, the power output of STIG Cycle is less sensitive to ambient temperature than that of Simple Cycle. NOx reduction to less then 25 ppm (when LNG is used) and operating flexibility under variable heat demand could be achieved. 2002 Elsevier Science Ltd. All rights reserved.

  • Performance improvement by conversion from a Simple-Cycle gas-turbine system to three different cogeneration systems
    Journal of The Institute of Energy, 2002
    Co-Authors: F.j. Wang, J.s. Chiou
    Abstract:

    Power generation using a Simple-Cycle gas turbine as the prime mover usually suffers from low efficiency. Associated with low efficiency is a high exergy loss through flue gases. To recover this kind of useful energy (or exergy) from the exhaust gases of a Simple-Cycle gas turbine generation unit, three different cogeneration systems are presented and evaluated. A computer program was developed to perform the thermodynamic and thermoeconomic analyses. The results indicate that the retrofitted system implemented with steam-injection and regeneration technologies was the best out of tested systems in terms of thermodynamic performance. In this study, the performance exceeded the criteria to become a qualified CHP system. The cost of electricity calculated from the same system is also the lowest under the local energy cost structure and practical operation patterns.

Christian Sommer - One of the best experts on this subject based on the ideXlab platform.

  • Short and Simple Cycle Separators in Planar Graphs
    ACM Journal of Experimental Algorithmics, 2016
    Co-Authors: Eli Fox-epstein, Shay Mozes, Phitchaya Mangpo Phothilimthana, Christian Sommer
    Abstract:

    We provide an implementation of an algorithm that, given a triangulated planar graph with m edges, returns a Simple Cycle that is a 3/4-balanced separator consisting of at most s8m edges. An efficient construction of a short and balanced separator that forms a Simple Cycle is essential in numerous planar graph algorithms, for example, for computing shortest paths, minimum cuts, or maximum flows. To the best of our knowledge, this is the first implementation of such a Cycle separator algorithm with a worst-case guarantee on the Cycle length. We evaluate the performance of our algorithm and compare it to the planar separator algorithms recently studied by Holzer et al. [2009]. Out of these algorithms, only the Fundamental Cycle Separator (FCS) produces a Simple Cycle separator. However, FCS does not provide a worst-case size guarantee. We demonstrate that (1) our algorithm is competitive across all test cases in terms of running time, balance, and Cycle length; (2) it provides worst-case guarantees on the Cycle length, significantly outperforming FCS on some instances; and (3) it scales to large graphs.

  • short and Simple Cycle separators in planar graphs
    Algorithm Engineering and Experimentation, 2013
    Co-Authors: Eli Foxepstein, Shay Mozes, Phitchaya Mangpo Phothilimthana, Christian Sommer
    Abstract:

    We provide an implementation of an algorithm that, given a triangulated planar graph with m edges, returns a Simple Cycle that is a 2/3--balanced separator consisting of at most √8m edges. An Efficient construction of a short and balanced separator that forms a Simple Cycle is essential in numerous planar graph algorithms, e.g., for computing shortest paths, minimum cuts, or maximum flows. To the best of our knowledge, this is the first implementation of such a Cycle separator algorithm with a worst-case guarantee on the Cycle length. We evaluate the performance of our algorithm and compare it to the planar separator algorithms recently studied by Holzer et al. [ESA 2005, ACM Journal of Experimental Algorithms 2009]. Out of these algorithms, only the Fundamental Cycle Separator (FCS) produces a Simple Cycle separator. However, FCS does not provide a worst-case size guarantee. We demonstrate that (i) our algorithm is competitive across all test cases in terms of running time, balance and Cycle length, (ii) it provides worst-case guarantees on the Cycle length, significantly outperforming FCS on some instances, and (iii) it scales to large graphs.

  • ALENEX - Short and Simple Cycle separators in planar graphs
    2013
    Co-Authors: Eli Fox-epstein, Shay Mozes, Phitchaya Mangpo Phothilimthana, Christian Sommer
    Abstract:

    We provide an implementation of an algorithm that, given a triangulated planar graph with m edges, returns a Simple Cycle that is a 2/3--balanced separator consisting of at most √8m edges. An Efficient construction of a short and balanced separator that forms a Simple Cycle is essential in numerous planar graph algorithms, e.g., for computing shortest paths, minimum cuts, or maximum flows. To the best of our knowledge, this is the first implementation of such a Cycle separator algorithm with a worst-case guarantee on the Cycle length. We evaluate the performance of our algorithm and compare it to the planar separator algorithms recently studied by Holzer et al. [ESA 2005, ACM Journal of Experimental Algorithms 2009]. Out of these algorithms, only the Fundamental Cycle Separator (FCS) produces a Simple Cycle separator. However, FCS does not provide a worst-case size guarantee. We demonstrate that (i) our algorithm is competitive across all test cases in terms of running time, balance and Cycle length, (ii) it provides worst-case guarantees on the Cycle length, significantly outperforming FCS on some instances, and (iii) it scales to large graphs.

Juan Pablo Vargas Machuca Bueno - One of the best experts on this subject based on the ideXlab platform.

  • Thermoeconomic and environmental analysis and optimization of the supercritical CO2 Cycle integration in a Simple Cycle power plant
    Applied Thermal Engineering, 2019
    Co-Authors: Eder Darwin Sánchez Villafana, Juan Pablo Vargas Machuca Bueno
    Abstract:

    Abstract In the present work, a thermoeconomic and thermo-environmental analysis is carried out in Santa Rosa Simple Cycle thermal power plant (air Brayton Cycle), located in Peru. Subsequently, the same analysis is applied to a proposed integrated thermal power plant, formed by the integration of a supercritical C O 2 partial heating Brayton Cycle in the mentioned Simple Cycle thermal power plant. Also, an exhaustive parametric study is carried out to investigate the effects of some decision variables on the thermoeconomic performance of the proposed system. Finally, the integrated thermal power plant is optimized from the thermoeconomic and environmental point of view, the objective function considered is the total cost, which is the sum of the capital investment cost, exergy destruction cost and environmental cost. The results show that the total product unit cost (electricity) is reduced by 10.37% respect to the initial condition. In addition, the specific investment cost and net efficiency are lower by 25.25% and 0.45% respectively, compared to a conventional combined Cycle thermal power plant.

James W. Lyons - One of the best experts on this subject based on the ideXlab platform.

  • Utility Perspective of Selecting Air Filter for Simple-Cycle, Heavy-Duty Combustion Turbines
    Journal of Engineering for Gas Turbines and Power, 1993
    Co-Authors: James W. Lyons, Alex Morrison
    Abstract:

    The combustion turbines evaluated for this study range in size (nominal) from 80 MW to 100 MW and operate at a compression ratio between 10 and 14. Under these conditions the compressor ingests about 500,000 to 725,000 cubic feet of air per minute for its rated output. With this volume of air, even low concentrations of contaminants can result in a significant total amount of contaminants entering the unit, which may cause compressor erosion, fouling, and foreign object damage in the compressor section and cooling air passage blockage, locking of turbine blade roots, and hot corrosion or sulfidation in the turbine section. Adequate protection against the above-mentioned degradation or damage due to poor air quality may be obtained by using properly designed air filters. An inadequate filter system or total lack of one results in a reduction in power and efficiency over the life of the unit and may significantly decrease the intervals between maintenance and thereby increase the cost of maintenance. Consideration should be given to adding an air inlet filter when or after the combustion turbine without air filter is overhauled to reduce future maintenance costs. This study investigates the need for an inlet air filtration system for Simple-Cycle, heavy-duty combustion turbines from a cost/benefit and operation standpoint. Options for inlet air filters include a self-cleaning pulse type filter, a surface loading cartridge filter without pulse feature, and a three-stage depth loading type media type filter. Benefits are determined by estimates of improvements in performance and effects on the combustion turbine’s longevity and maintenance.

  • Utility Perspective of Selecting Air Filter for Simple-Cycle, Heavy-Duty Combustion Turbines
    Volume 4: Heat Transfer; Electric Power; Industrial and Cogeneration, 1992
    Co-Authors: James W. Lyons, Alex Morrison
    Abstract:

    The combustion turbines evaluated for this study range in size (nominal) from 80 MW to 100 MW and operate at a compression ratio between 10 and 14. Under these conditions the compressor ingests about 500,000 to 725,000 cubic feet of air per minute for its rated output. With this volume of air, even low concentrations of contaminants can result in a significant total amount of contaminants entering the unit, which may cause compressor erosion, fouling, and foreign object damage in the compressor section and cooling air passage blockage, locking of turbine blade roots, and hot corrosion or sulfidation in the turbine section. Adequate protection against the above mentioned degradation or damage due to poor air quality may be obtained by using properly designed air filters. An inadequate filter system or having no filter system results in a reduction in power and efficiency over the life of the unit and may significantly decrease the intervals between maintenance and thereby increase the cost of maintenance. Consideration should be given to adding an air inlet filter when or after the combustion turbine without air filter is overhauled to reduce future maintenance costs. This study investigates the need for an inlet air filtration system for the Simple-Cycle, heavy-duty combustion turbines from a cost/benefit and operation standpoint. Options for inlet air filters include a self-cleaning pulse type filter, a surface loading cartridge filter without pulse feature, and a three-stage depth loading type media type filter. Benefits are determined by estimates of improvements in performance and effects on the combustion turbine’s longevity and maintenance.

  • Utility Perspective of Selecting Air Filter for Simple-Cycle, Heavy-Duty Combustion Turbines
    Volume 4: Heat Transfer; Electric Power; Industrial and Cogeneration, 1992
    Co-Authors: James W. Lyons, Alex Morrison
    Abstract:

    The combustion turbines evaluated for this study range in size (nominal) from 80 MW to 100 MW and operate at a compression ratio between 10 and 14. Under these conditions the compressor ingests about 500,000 to 725,000 cubic feet of air per minute for its rated output. With this volume of air, even low concentrations of contaminants can result in a significant total amount of contaminants entering the unit, which may cause compressor erosion, fouling, and foreign object damage in the compressor section and cooling air passage blockage, locking of turbine blade roots, and hot corrosion or sulfidation in the turbine section. Adequate protection against the above mentioned degradation or damage due to poor air quality may be obtained by using properly designed air filters. An inadequate filter system or having no filter system results in a reduction in power and efficiency over the life of the unit and may significantly decrease the intervals between maintenance and thereby increase the cost of maintenance. Consideration should be given to adding an air inlet filter when or after the combustion turbine without air filter is overhauled to reduce future maintenance costs.This study investigates the need for an inlet air filtration system for the Simple-Cycle, heavy-duty combustion turbines from a cost/benefit and operation standpoint. Options for inlet air filters include a self-cleaning pulse type filter, a surface loading cartridge filter without pulse feature, and a three-stage depth loading type media type filter. Benefits are determined by estimates of improvements in performance and effects on the combustion turbine’s longevity and maintenance.Copyright © 1992 by ASME