Volume 2, Issue 2, December 2018, Page: 39-53
Performance Improvement of a Dry Mode Natural Gas Fired Turbine Plant for Combined Cycle Operation
Anthony Kpegele Le-ol, Department of Mechanical Engineering, Rivers State University, Port Harcourt, Nigeria
Duabari Silas Aziaka, Center for Power and Propulsion, Cranfield University, Bedfordshire, United Kingdom
Received: Sep. 17, 2018;       Accepted: Nov. 5, 2018;       Published: Dec. 3, 2018
DOI: 10.11648/j.ae.20180202.13      View  894      Downloads  95
Abstract
This research considers the design of combined cycle (CC) operation for a dry mode natural gas fired turbine plant in southern Nigeria. It entails evaluation and utilization of the amount of waste heat energy exhausted by the Omoku gas turbine (GT) power plant by integrating a steam Rankine cycle retrofitted with a heat recovery steam generator (HRSG) for CC operation, with the focus to improving its performance and reducing waste heat intensity to the environment. Gathered data from the human machine interface (HMI) and log sheets were used for the analysis. Thermodynamic sensitivity analysis was implemented for the combined cycle system (CCS) using a developed model in the MATLAB platform. The outcome of energy balance of the HRSG having a heat load of 38.49 MW showed that for every kg of exhaust gas, 0.1164 kg of steam is generated at an optimum pressure of 40 bar and mass flow of 14.45 kg, with acceptable steam turbine exhaust moisture content of 10%. These revealed a quantified amount of 45.28 MW heat energy contained in the usually wasted exhaust gas of the dry mode GT which was thus recovered in the HRSG, producing additional 16.32 MW as the steam turbine (ST) power output with a feed pump heat load of 0.06 MW and a condenser heat load of 28.96 MW. Further analysis in terms of power outputs, energy efficiencies, and environmental impacts showed that the CCS achieved 41.32 MW, 49.26% and HRSG stack temperature of 170.25oC compared to the previously 25 MW, 26.60% and exhaust gas temperature (EGT) of 487°C respectively of the dry mode GT. These indicate that the CCS generates about 65.30% boost in the net power output, 85.20% improvement in overall efficiency and 65.10% reduction in waste heat intensity to the environment when compared with the dry mode GT operating in isolation. Thus, the work showed that for the design of a CCS with a single pressure level HRSG without supplementary firing, a recommended range for the power output of the steam bottoming plant falls within 34 – 40% of the total power output of the CCS while that of the gas topping plant falls within the range of 60 – 66% of the total power output of the CCS. This study therefore confirms the viability as well as demonstrates the application, of the combined cycle concept for the Omoku gas turbine and recommends for further research, the introduction of a multiple pressure level HRSG with supplementary firing to the combined cycle system for an improved efficiency and output.
Keywords
Dry Mode Gas Turbine, Combined Cycle System, Heat Recovery Steam Generator, Waste Heat Intensity, Heat Load, Power Output
To cite this article
Anthony Kpegele Le-ol, Duabari Silas Aziaka, Performance Improvement of a Dry Mode Natural Gas Fired Turbine Plant for Combined Cycle Operation, Applied Engineering. Vol. 2, No. 2, 2018, pp. 39-53. doi: 10.11648/j.ae.20180202.13
Copyright
Copyright © 2018 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Reference
[1]
Le-ol, A. K. (2016) Improvement of Omoku Gas Turbine Power Plant for Combined Cycle Operation. M. Tech. Dissertation, Department of Mechanical Engineering, Rivers State University, Port-Harcourt, Nigeria.
[2]
Kumar, P. (2010) Optimization of Gas Turbine Cycle Using Optimization Technique. M. Eng. Thesis, Department of Mechanical Engineering, Thapar University, Patiala-147004, India.
[3]
Aref, P. (2012) Development of Framework for Thermo-Economic Optimization of Simple and Combined Gas Turbine Cycles; Ph. D. Thesis, school of Engineering, Cranfield University.
[4]
Rao, S. and Parulekar, B. B. (2007) Energy Technology: Non-Conventional, Renewable and Conventional. Khanna Publishers, Naisarak, Delhi.
[5]
Lebele-Alawa, B. T. and Le-ol, A. K. (2015) Improved Design of a 25 MW Gas Turbine Plant using Combined Cycle Application Journal of Power and Energy Engineering, 3, 1-14 http://dx.doi.org/10.4236/jpee.2015.38001.
[6]
De, S., Nag, P. K. (2000) Effect of Supplementary Firing on the Performance of an Integrated Gasification Combined Cycle Power Plant. Indian Institute of Technology, Kharagpur, India, Proc. Instn. Mech. Engrs., 214, Part A.
[7]
Kehlhofer, R., Rukes, B., Hannemann, F., & Stirnimann, F. (2009) Combined-Cycle Gas & Steam Turbine Power Plants, PenWell Corporation, Third Edition, Tulsa, Oklahoma, USA.
[8]
Nickhil, D., Sansher, S. S. Kachhwaha, Rajesh, A. A. (2012) Review of Combined Cycle Power Plant Thermodynamic Cycles: Proceedings of the National Conference on Trends and Advances in Mechanical Engineering, YMCA University of Science and Technology, Faridabad, Haryana, Oct. 19-20.
[9]
Lars, O. N. & Bolland, O. (2012) Steam Bottoming Cycles Offshore – Challenges and Possibilities. Journal of Power Technologies, 92 (3), 201-207.
[10]
Polyzakis A. L., Koroneous C., & Xydis G., (2008) Optimum Gas Turbine Cycle for Combined Cycle Power Plant. Energy Conversion and Management Publications 49, 551-563.
[11]
Tiwari, A. K, Hasan, M. M, Islam, M. (2012) Effect of Operating Parameters on the Performance of Combined Cycle Power Plant.1: 351 doi: 10.4172/scientificreports.
[12]
Ravi Kumar, N., Rama Krishna, K., & Sita Rama Raju, A. V. (2006) Performance Simulation of Heat Recovery Steam Generator in Combined Cycle Power Plant. Proceeding of the 18th National and 17th ISHMT-ASME Heat and Mass Transfer Conference, India.
[13]
Murad, A. R., Amirabedin, E., Yilmazoglu, M. Z., & Durmaz, A. (2010) Analysis of Heat Recovery Steam Generators in Combined Cycle Power Plants. The Second International Conference on Nuclear and Renewable Energy Resources, Ankara, Turkey.
[14]
Ahmed, S. Y. (2013) Performance of the Combined Gas Turbine-Steam Cycle for Power Generation. Mathematical Theory and Modeling, 3, 12.
[15]
Thamir, K. I. & Rahman, M. M. (2012) Effect of Compression Ratio on Performance of Combined Cycle Gas Turbine: Scientific & Academic Publishing. International Journal of energy Engineering; 2 (1), 9-14.
[16]
Service Manual (Gas Turbine MS 5001) of 25 MW Unit of Omoku Power Generation Station. GEPS Oil & Gas, Nuovo Pignone, Volume 1; G. T Description, Instruction & Operation.
[17]
Armando, A. (2013) Optimization of Maputo Power Plant, Master of Science Thesis, KTH School of Industrial Engineering and Management Energy Technology, STOCKHOLM.
[18]
Kehlhoffer, R. (1997) Combined Cycle Gas and Steam Turbine Power Plants. PennWell Publishing Company, Oklahoma.
[19]
Jehar and Associates. Introduction to HRSG design. www.hrsgdesign.com.
[20]
Ragland, A., Vogt-NEM, Stenzel, W. (2000) Combined Cycle Heat Recovery Optimization. Proceedings of 2000 International Joint Power Generation Conference, Miami Beach, July 23 (26), 1781-1787.
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