Browsing by Subject "Natural gas"
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Item Energy and exergy analysis of electricity generation from natural gas pressure reducing stations(Elsevier Ltd, 2015) Neseli M.A.; Ozgener O.; Ozgener L.Electricity generation or power recovery through pressure reduction stations (PRS) for general use has not been realized in Izmir. The main objective of the present study was to do a case study for calculating electricity to be recovered in one natural gas pressure reduction stations in Izmir. It is the first forecasting study to obtain energy from natural gas pressure-reducing stations in Izmir. Energy can be obtained from natural gas PRS with turbo-expanders instead of using throttle valves or regulators from the PRS. The exergy performance of PRS with TE is evaluated in this study. Exergetic efficiencies of the system and components are determined to assess their individual performances. Based upon pressure change and volumetric flow rate, it can be obtained by recovering average estimated installed capacity and annual energy 494.24 kW, 4113.03 MW h, respectively. In terms of estimated installed capacity power and annual energy, the highest level is 764.88 kW, approximately 6365.34 MW h, in Aliaga PRS. Also it can be seen that CO2 emission factor average value is 295.45 kg/MW h. © 2015 Elsevier B.V. All rights reserved.Item Thermo-mechanical exergy analysis of Marmara Eregli natural gas pressure reduction station (PRS): An application(Elsevier Ltd, 2017) Alparslan Neseli M.; Ozgener O.; Ozgener L.The paper deals with thermo-mechanical exergy analysis of the electricity production by recovering from natural gas pressure reduction station. In this study we present an energy and exergy assessment and modeling of PRS systems for their system analysis, performance evaluation and optimization. A comprehensive case study is conducted in Marmara 1.3 MW pressure reduction station (PRS) in Tekirdag, Turkey and actual thermal data are collected and employed for analysis. Using actual system data, an assessment of the pressure reduction station system performance, energy and exergy efficiencies, and exergy destructions in the system is conducted in this regard. The exergy destructions in the overall PRS are quantified and illustrated. It is observed through analysis that the exergy destructions in the system particularly take place as the exergy of the fluid lost in the turbo expender, the heat exchanger losses of the system. For system performance analysis and improvement, both average energy and exergy efficiencies of the overall PRS are investigated and determined to be 71.96% and 78.25%, respectively. © 2017 Elsevier LtdItem The effect of ambient temperature on electric power generation in natural gas combined cycle power plant—A case study(Elsevier Ltd, 2018) Şen G.; Nil M.; Mamur H.; Doğan H.; Karamolla M.; Karaçor M.; Kuyucuoğlu F.; Yörükeren N.; Bhuiyan M.R.A.Natural gas combined cycle power plants (CCPPs) are widely used to meet peak loads in electric energy production. Continuous monitoring of the output electrical power of CCPPs is a requirement for power performance. In this study, the role of ambient temperature change having the greatest effect on electric production is experimentally investigated for a natural gas CCPP. The plant has generated electricity for fourteen years and setup at 240 MW in Aliağa, İzmir, Turkey. Depending on the seasonal temperature changes, the study data were obtained from each gas turbine (GT), steam turbine (ST) and combined cycle blocks (CCBs) in the ambient temperature range of 8–23 °C. In electric energy production, an important decrease was in the GTs because of the temperature increase. This decrease indirectly affected the electric energy production of the STs. As a result, the efficiency of each GT, ST and CCB decreased, although the quantity of fuel consumed by the controllers in the plant was reduced. As a result of this data, it has been recommended and applied that additional precautions have been taken in the power plant to bring the air entering the combustion chamber to ideal conditions and necessary air cooling systems have been installed. © 2018 The AuthorsItem Life performance prediction of natural gas combined cycle power plant with intelligent algorithms(Elsevier Ltd, 2021) Karaçor M.; Uysal A.; Mamur H.; Şen G.; Nil M.; Bilgin M.Z.; Doğan H.; Şahin C.The efficient use of a system is enabled with the life performance estimations. Thus, the effective use of underground resources is realized especially natural gas. Based on this, life performance models were generated to aim of improving the efficient use of energy for a combined cycle power plant (CCPP) of 243 MW installed in Izmir, Turkey by using fuzzy logic (FL) and artificial neural network (ANN) in this study. Therefore, output power estimations were carried out. Depending on the developed models, an estimation of the energy that the CCPP can produce and provide to the interconnected system in the following years has been made. According to the obtained results, the error prediction rates of FL and ANN models were determined. It was found that while the energy relative error estimation value that can be produced between the years calculated in modeling using FL varies between 0.59% and 3.54%, this value was found to vary between 0.001% and 0.84% in modeling using ANN. This result shows that the ANN model is more suitable for the life performance estimations of such a non-linear system. © 2021 Elsevier LtdItem Applicability of cogeneration system in gas turbines used in natural gas storage facilities(Inderscience Publishers, 2022) Türkoğlu S.; Yurddaş A.; Bektaş A.Underground natural gas storage facilities are of critical importance on energy supply security. Storage activity in facilities performing underground storage is mostly carried out in spent natural reservoirs. In this study, the applicability of cogeneration system was investigated in order to generate electricity from flue gas at an average temperature of 500°C and 144.4 t/h flow rate obtained from three gas turbines in storage facilities and to recover the waste heat we lost. This designed system would have three HRSGs and one steam turbine, 16.23 MW energy would be generated from each HRSG in this system. After a total of 48.70 MW energy, obtained from two HGRSs, enters into the steam turbine operating in 24% efficiency, 12.20 MW mechanic energy and 11.84 MW electric energy is generated. Therefore, a total of 97.05 MW energy entering into combined cycle power plant was transformed into a total of 42.25 MW useful energy, including 30.41 MW mechanical and 11.84 MW electricity, and the efficiency of system was calculated as 43.5%. It was aimed that the electric energy to be generated from this cogeneration system would contribute to the related facility and the electricity supply of the public against its price. [Received: October 17, 2020; Accepted: May 03, 2021] Copyright © 2022 Inderscience Enterprises Ltd.