The Experts below are selected from a list of 29106 Experts worldwide ranked by ideXlab platform
Alok Ku Mohapatra - One of the best experts on this subject based on the ideXlab platform.
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comparative analysis of inlet air cooling techniques integrated to Cooled Gas turbine plant
Journal of The Energy Institute, 2015Co-Authors: Alok Ku MohapatraAbstract:Abstract The current article is focused on assessing the comparison of two different means of inlet air cooling (evaporative cooing and vapor compression cooling) integrated to a Cooled Gas turbine power plant. Air film cooling has been adopted as the cooling technique for Gas turbine buckets. A parametric study of the effect of pressure ratio (r p,c ), compressor inlet temperature (CIT), turbine inlet temperature (TIT), inlet temperature ratio (r IT ), ambient relative humidity and ambient temperature on performance parameters of plant has been carried out. It has been observed that the integration of the inlet air cooling system to the Gas turbine cycle improves the overall performance, the improvement being higher at higher ambient temperature and ambient relative humidity. At a TIT = 1700 K, r p,c = 23, RH a = 0.2 and T a = 313 K, vapor compression inlet air cooling has been observed to improve the plant specific work by 18.4% and efficiency by 4.18%, compared to 10.48% and 4.6% respectively for evaporative cooling. In geographical regions having low ambient relative humidity and low ambient temperature however, evaporative inlet air cooling should be preferred over vapor compression cooling in terms of higher plant efficiency.. The adoption of higher turbine inlet temperature has a more pronounced effect on vapor compression Cooled Gas turbine in terms of enhancement in plant performance parameters as compared to evaporative cooling. The work ratio increases with increase in value of r IT upto5.6 after which it decreases.
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thermodynamic assessment of impact of inlet air cooling techniques on Gas turbine and combined cycle performance
Energy, 2014Co-Authors: Alok Ku MohapatraAbstract:The article is focused on the comparison of impact of two different methods of inlet air cooling (vapor compression and vapor absorption cooling) integrated to a Cooled Gas turbine based combined cycle plant. Air-film cooling has been adopted as the cooling technique for Gas turbine blades. A parametric study of the effect of compressor pressure ratio, compressor inlet temperature (Ti,C), turbine inlet temperature (Ti,T), ambient relative humidity and ambient temperature on performance parameters of plant has been carried out. Optimum Ti,T corresponding to maximum plant efficiency of combined cycle increases by 100 °C due to the integration of inlet air cooling. It has been observed that vapor compression cooling improves the efficiency of Gas turbine cycle by 4.88% and work output by 14.77%. In case of vapor absorption cooling an improvement of 17.2% in Gas cycle work output and 9.47% in Gas cycle efficiency has been observed. For combined cycle configuration, however, vapor compression cooling should be preferred over absorption cooling in terms of higher plant performance. The optimum value of compressor inlet temperature has been observed to be 20 °C for the chosen set of conditions for both the inlet air cooling schemes.
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analysis of parameters affecting the performance of Gas turbines and combined cycle plants with vapor absorption inlet air cooling
International Journal of Energy Research, 2014Co-Authors: Alok Ku MohapatraAbstract:SUMMARY The integration of an aqua-ammonia inlet air-cooling scheme to a Cooled Gas turbine-based combined cycle has been analyzed. The heat energy of the exhaust Gas prior to the exit of the heat recovery steam generator has been chosen to power the inlet air-cooling system. Dual pressure reheat heat recovery steam generator is chosen as the combined cycle configuration. Air film cooling has been adopted as the cooling technique for Gas turbine blades. A parametric study of the effect of compressor–pressure ratio, compressor inlet temperature, turbine inlet temperature, ambient relative humidity, and ambient temperature on performance parameters of plants has been carried out. It has been observed that vapor absorption inlet air cooling improves the efficiency of Gas turbine by upto 7.48% and specific work by more than 18%, respectively. However, on the adoption of this scheme for combined cycles, the plant efficiency has been observed to be adversely affected, although the addition of absorption inlet air cooling results in an increase in plant output by more than 7%. The optimum value of compressor inlet temperature for maximum specific work output has been observed to be 25 °C for the chosen set of conditions. Further reduction of compressor inlet temperature below this optimum value has been observed to adversely affect plant efficiency. Copyright © 2013 John Wiley & Sons, Ltd.
Onkar Singh - One of the best experts on this subject based on the ideXlab platform.
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thermodynamic investigation of parameters affecting the execution of steam injected Cooled Gas turbine based combined cycle power plant with vapor absorption inlet air cooling
Applied Thermal Engineering, 2017Co-Authors: Anoop Kumar Shukla, Onkar SinghAbstract:Abstract Present paper deals with the thermodynamic investigation of influence of different parameters in steam injected Cooled Gas turbine based combined cycle power plant employing vapor absorption cooling of inlet air and two pressure heat recovery steam generator. Vapor absorption cooling scheme is run by utilizing the heat energy of the exhaust Gas at the exit of HRSG. Gas turbine blades are Cooled using film cooling technique. A study of the influence of ambient conditions, cycle pressure ratio, and turbine entry temperature on plant performance has been carried out. It has been noted that the efficiency of Gas turbine improves by up to 6.91% and specific work output enhances by 16.42% with the integration of vapor absorption inlet air cooling to the simple cycle. The CCPP specific work output advances 17.34% at given turbine entry temperature as the steam to air ratio increases from 3% to 7% at the cycle pressure ratio of 24. Similarly thermal efficiency of CCPP increases by 6.78% for same cycle pressure ratio of 24 and the constant increment in steam to air ratio from 3 to 7%.
M. De Paepe - One of the best experts on this subject based on the ideXlab platform.
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RAISING CYCLE EFFICIENCY BY INTERCOOLING IN AIR-Cooled Gas TURBINES
Applied Thermal Engineering, 2006Co-Authors: Hugo Canière, Arnout Willockx, Erik Dick, M. De PaepeAbstract:Abstract The working temperature of a Gas turbine, necessary to achieve high efficiency, makes cooling of the first turbine stages unavoidable. Air and steam can be used for cooling. A model for an air-Cooled Gas turbine based on the work of Young and Wilcock [J.B. Young, R.C. Wilcock, ASME J. Turbomachinery 124 (2002) 207–221] is implemented in Aspen™. Simple cycle calculations with realistic parameters of current machines are made and confirm the results of Wilcock et al. [R.C. Wilcock, J.B. Young, J.H. Horlock, ASME J. Eng. Gas Turb. Power 127 (2005) 109–120] that increasing the turbine inlet temperature no longer means an increase in Gas turbine cycle efficiency. This conclusion has important consequences for Gas turbines because it breaks with the general accepted trend of increasing the TIT. An interCooled Gas turbine cycle is intensively investigated, taking the turbine cooling into account. Intercooling not only lowers the work of compression, but also lowers cooling air temperatures. The major influences of the intercooling on the Gas turbine cycle are mapped and explained. Optimum intercooling pressure for maximum Gas turbine cycle efficiency is much lower than halfway compression. A simulation of the LMS100, the most recent Gas turbine on the market from GE Energy, is made to verify the simulation methodology. The claimed interCooled cycle efficiency of 46% is confirmed. Further increasing the pressure ratio and TIT can still improve the performance of the interCooled Gas turbine cycle.
Shivam Mishra - One of the best experts on this subject based on the ideXlab platform.
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energy and exergy analysis of air film Cooled Gas turbine cycle effect of radiative heat transfer on blade coolant requirement
Applied Thermal Engineering, 2018Co-Authors: Shivam MishraAbstract:Abstract Gas turbine blade cooling is critical to continuous reliable operation of Gas turbines. Literature suggests that air-film cooling is one of the most widely used blade cooling techniques. This paper compares previously developed blade cooling models which are relevant to film cooling technique and it also proposes a Gas turbine blade cooling model for the estimation of blade coolant mass fraction, considering radiative heat transfer from hot combustion Gases to Gas turbine blade surface. The proposed model gives an enhanced coolant mass fraction (≈5–6% over a wide range of TIT) as compared to previously developed models while analyzing Gas turbine cycle. Gas turbine cycle performance has been evaluated based on two blade cooling models to compare blade coolant flow mass fraction, Gas turbine plant specific work which are function of both compressor-pressure ratio and turbine inlet temperature. Both the blade cooling models closely follow each other with radiative cooling model. For the proposed blade cooling model, Gas turbine specific work is around 417.39 kJ/kg (rpc = 22 and TIT = 1650 K) and Gas turbine thermal cycle efficiency has been found to be 41.25% at (rpc = 22 and TIT = 1550 K). Exergy analysis of Gas turbine cycle has also been done which shows combustor to be main source of exergy destruction (≈29%).
Anoop Kumar Shukla - One of the best experts on this subject based on the ideXlab platform.
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thermodynamic investigation of parameters affecting the execution of steam injected Cooled Gas turbine based combined cycle power plant with vapor absorption inlet air cooling
Applied Thermal Engineering, 2017Co-Authors: Anoop Kumar Shukla, Onkar SinghAbstract:Abstract Present paper deals with the thermodynamic investigation of influence of different parameters in steam injected Cooled Gas turbine based combined cycle power plant employing vapor absorption cooling of inlet air and two pressure heat recovery steam generator. Vapor absorption cooling scheme is run by utilizing the heat energy of the exhaust Gas at the exit of HRSG. Gas turbine blades are Cooled using film cooling technique. A study of the influence of ambient conditions, cycle pressure ratio, and turbine entry temperature on plant performance has been carried out. It has been noted that the efficiency of Gas turbine improves by up to 6.91% and specific work output enhances by 16.42% with the integration of vapor absorption inlet air cooling to the simple cycle. The CCPP specific work output advances 17.34% at given turbine entry temperature as the steam to air ratio increases from 3% to 7% at the cycle pressure ratio of 24. Similarly thermal efficiency of CCPP increases by 6.78% for same cycle pressure ratio of 24 and the constant increment in steam to air ratio from 3 to 7%.