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Performance of small-scale aero-derivative industrial gas turbines derived from helicopter engines

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Propulsion and Power Research 2013年第4期2卷 243-253页

作者： barinyima nkoi Pericles Pilidis Theoklis Nikolaidis Department of Power and Propulsion School of EngineeringCranfield UniversityCranfieldBedfordshireMK430ALUnited Kingdom

This paper considers comparative assessment of simple and advanced cycle small-scale aero-derivative industrial gas turbines derived from helicopter *** particularly,investigation was made of technical performance of the small-scale aero-derivative engine cycles based on existing and projected cycles for applications in industrial power generation,combined heat and power concept,rotating equipment driving,and/or allied *** investigation was done by carrying out preliminary design and performance simulation of a simple cycle(baseline)two-spool small-scale aero-derivative turboshaft engine model,and some advanced counterpart aero-derivative *** advanced configurations consist of recuperated and intercooled/recuperated engine cycles of same nominal power rating of 1.567 *** baseline model was derived from the conversion of an existing helicopter engine *** doing so,design point and off-design point performances of the engine models were *** comparing their performances,it was observed that to a large extent,the advanced engine cycles showed superior performance in terms of thermal efficiency,and specific fuel *** numerical terms,thermal efficiencies of recuperated engine cycle,and intercooled/recuperated engine cycles,over the simple cycle at DP increased by 13.5%,and 14.5%respectively,whereas specific fuel consumption of these cycles over simple cycle at DP decreased by 12.5%,and 13%*** research relied on open access public literature for data.

关键词： Gas turbine Small-scale aero-derivatives Thermal efficiency Intercooled/Recuperated Simple-cycle Specific-fuel-consumption Performance assessment Helicopter engine

Advanced Cycles Large-Scale Aero-Derivative Gas Turbines: Performance Comparison

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Journal of Power and Energy Engineering 2016年第5期4卷 7-19页

作者： barinyima nkoi Thank God Ebi Isaiah Department of Mechanical Engineering Rivers State University of Science and Technology Port Harcourt Nigeria Department of Mechanical Engineering Niger Delta University Wilberforce Island Nigeria

This paper aims at carrying out comparative performance analysis of simple and advanced cycles large-scale aero-derivative industrial gas turbines derived from aircraft turbofan engines. The investigation involves technical performances of three large-scale aero-derivative engine cycles based on existing and projected cycles for applications in land based power generation and Combined-Heat-and-Power (CHP). Preliminary design and performance simulation were implemented of a simple cycle (baseline) three-spool 100 MW aero-derivative engine model, intercooled and intercooled/recuperated engine cycles of the same 100 MW nominal power rating. In the analysis, design point and off-design performances of the engine models were established. The results indicate that to a large extent, the advanced engine cycles showed superior performance in terms of thermal efficiency, and fuel flow. In numerical terms, thermal efficiencies of intercooled engine cycle, and intercooled/recuperated engine cycles, over the simple cycle at design point increased by 2.42% and 0.94% respectively, whereas heat rates of these cycles over simple cycle at design point decreased by 2.37% and 0.93% respectively. It is worthy of note that for large-scale aero-derivative gas turbines having power rating of 100 MW and above, intercooled cycle would consume less fuel than intercooled-recuperated and simple cycles. This finding would actually aid good choice of cycle option for large-scale aero-derivative gas turbine designers, manufacturers and users.

关键词： Aero-Derivative-Gas-Turbines Thermal-Efficiency Intercooled-Recuperated Fuel-Flow Heat-Rate

Comparative Assessment of Combined-Heat-and-Power Performance of Small-Scale Aero-Derivative Gas Turbine Cycles

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Journal of Power and Energy Engineering 2015年第9期3卷 20-32页

作者： barinyima nkoi Barinaadaa Thaddeus Lebele-Alawa Mechanical Engineering Department Faculty of Engineering Rivers State University of Science and Technology Port Harcourt Nigeria

This paper considers comparative assessment of combined-heat-and-power (CHP) performance of three small-scale aero-derivative industrial gas turbine cycles in the petrochemical industry. The bulk of supposedly waste exhaust heat associated with gas turbine operation has necessitated the need for CHP application for greater fuel efficiency. This would render gas turbine cycles environ-mentally-friendly, and more economical. However, choosing a particular engine cycle option for small-scale CHP requires information about performances of CHP engine cycle options. The investigation encompasses comparative assessment of simple cycle (SC), recuperated (RC), and intercooled-recuperated (ICR) small-scale aero-derivative industrial gas turbines combined-heat-and-power (SS-ADIGT-CHP). Small-scale ADIGT engines of 1.567 MW derived from helicopter gas turbines are herein analysed in combined-heat-and-power (CHP) application. It was found that in this category of ADIGT engines, better CHP efficiency is exhibited by RC and ICR cycles than SC engine. The CHP efficiencies of RC, ICR, and SC small-scale ADIGT-CHP cycles were found to be 71%, 60%, and 56% respectively. Also, RC engine produces the highest heat recovery steam generator (HRSG) duty. The HRSG duties were found to be 3171.3 kW for RC, 2621.6 kW for ICR, and 3063.1 kW for SC. These outcomes would actually meet the objective of aiding informed preliminary choice of small-scale ADIGT engine cycle options for CHP application.

关键词： Aero-Derivative Gas Turbines Combined-Heat-and-Power Heat Recovery Steam Generator CHP Efficiency

Performance Analysis of an Energy System in the Tropical Rainforest: A Thermo-Economic Approach

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Journal of Power and Energy Engineering 2018年第1期6卷 8-20页

作者： barinyima nkoi Kenneth Israel Sidum Adumene Department of Mechanical Engineering Rivers State University Port Harcourt Nigeria Department of Marine Engineering Rivers State University Port Harcourt Nigeria

This paper presents the thermos-economic evaluation of a simple gas turbine (SGT) within the Niger Delta, Nigeria. Steady-state monitoring and direct collection of data from the 25 MW plant were performed including logged data for a 12 months period. MATLAB software was used to model the various thermodynamic performance equations of the plants while net present value (NPV), internal rate of return (IRR), and Payback period (PBP) were used to model the economic concept of the plant performance. The thermodynamic analysis shows that for every 1℃ rise in the ambient temperature, the percentage power drop increases by 2.07%, thermal efficiency drops by 0.66%, and the specific fuel consumption increases by 0.93%. For every 1% drop in the power output, the percentage thermal efficiency drops by 0.79% for the given consideration. The economic analysis based on the performance reveals that the power shortages represent about 47.9% of the net power generated and the revenue worth of $4198741.60 is lost due to the inability of the plant to perform at its design point. The NPV value of $6434899.97 shows that the plant investment is viable for the period of twenty years of operation and the IRR on investment is determined to be 12.40% by a numerical approximation for the period, with a PBP of 8.5 years. This provides technical and economic details to plant operators and energy systems investors for decision making.

关键词： Gas Turbine Power Output Overall Efficiency Net Present Value Internal Rate of Return Payback Period

Thermodynamic and Environmental Assessment of Gas Flaring in the Niger Delta Region of Nigeria

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Journal of Power and Energy Engineering 2018年第12期6卷 39-56页

作者： Richard V. James Howells I. Hart barinyima nkoi Mechanical Engineering Department Rivers State University Port Harcourt Nigeria

This paper discusses the thermodynamic and environmental assessment of flared gases in an oil field. The oil field for the case study is located in the Niger Delta region of Nigeria. The data required for this report were obtained during a nine-year period (2008-2016), which revealed production volumes, flared volumes, operating temperatures and pressures, gas compositions, gas density, and flow rates. With the data and the aid of fundamental thermodynamic equations and MATLAB program codes, analysis was carried out on combustion to ascertain the amount of flue gases. Analyses revealed that a total of 1.99175 × 1011 standard cubic feet of gas was flared during the said period, generating anthropogenics estimated at 582,319,618.1825 m3 (≈1.046 Mt) of CO2, 1,077,510,054.31 m3 (≈2.0 Mt) of water vapour, 14,960,560.91 m3 of methane emitted and contaminated the atmosphere creating serious environmental concerns. Further analyses also showed that the approximate adiabatic flame temperature is about 1965°C for the field under investigation. Exergy analyses carried out also revealed that a total of 3.6099 × 1013 kJ (36.099 TJ) of exergy was available which would have translated to 1.0189 × 1010 kWh of electrical energy for the period under investigation. Conclusively, some measures that can be taken to prevent gas flaring are that every new project on oil and gas should incorporate technical details of gas gathering and utilization plan at the conceptual and design phases of projects for gas commercialization, establishment of more gas-to-power project for gas utilization. Also Carbon capture technology should be enhanced, although the best option is flaring out based on the astronomical amount of carbon (IV) oxide and other greenhouse gases depicted by the results. The entire work and results showed that gas flaring is undesired and pernicious because it has thermal, environmental and economic consequences.

关键词： Combustion Exergy Adiabatic Flame Temperature Gas Flaring Carbon (IV) Oxide