scholarly journals Research on the performance improvement of a two-shaft gas turbine with a variable area nozzle power turbine

2020 ◽  
Vol 24 (6 Part A) ◽  
pp. 3721-3733
Author(s):  
Shiyao Li ◽  
Zhenlin Li ◽  
Hongbin Zhao
Keyword(s):  
Gas Turbine ◽  
Performance Improvement ◽  
Thermal Efficiency ◽  
Atmospheric Pressure ◽  
Atmospheric Temperature ◽  
Atmospheric Conditions ◽  
Fuel Flow ◽  
Power Turbine ◽  
Key Factor ◽  
Isentropic Efficiency

Both an increase in atmospheric temperature and a decrease in atmospheric pressure can lead to the degradation of the maximum allowable power output (MAPO) or the thermal efficiency of a gas turbine. In order to reduce these adverse effects, this paper provides a simulated study on the improvement of the MAPO and the variations of the thermal efficiency due to the fuel flow and variable area nozzle control under different atmospheric conditions. Simulation results indicate that the MAPO increases with the power turbine nozzle area, while the thermal efficiency shows a parabola trend. With the same increment of the power turbine nozzle area, the improvement of the MAPO goes up as the atmospheric temperature rises and the decrease of thermal efficiency is alleviated. Analyses show that the slow degradation of the compressor isentropic efficiency is a key factor that enables the MAPO to increase significantly and the thermal efficiency to remain almost constant.

Effect of the Environmental Conditions of Tropical Climates on the Performance Parameters of a Gas Turbine Power Generation Plant

2020 ◽  
Author(s):  
J. Fajardo ◽  
D. Barreto ◽  
T. Castro ◽  
I. Baldiris
Keyword(s):  
Power Plant ◽  
Relative Humidity ◽  
Gas Turbine ◽  
Output Power ◽  
High Temperatures ◽  
Environmental Conditions ◽  
Thermal Efficiency ◽  
Specific Work ◽  
Atmospheric Conditions ◽  
Compressor Inlet

Abstract It is known that high temperatures adversely affect the performance of gas turbines, but the effect of the combination of atmospheric conditions (temperature and relative humidity -RH-) on the operation of this type of system is unknown. In this work the effects of atmospheric conditions on the energy and exergy indicators of a power plant with gas turbine were studied. The indicators studied were the mass flow, the specific work consumed by the compressor, specific work produced by the turbine, the combustion gas temperature, the NO concentration, the net output power, the thermal efficiency, the heat rate, the specific consumption of fuel, the destruction of exergy and exergy efficiency. Among the results, it is noted that for each degree celsius that reduces the temperature of the air at the compressor inlet at constant relative humidity on average, the mass flow of dry air increases by 0.27 kg/s, the specific work consumed by the compressors decreases by 0.45%, the output power increases by 1.17% and the thermal efficiency increases by 0.8%, the exergy destruction increases by 0.72% and the exergy efficiency increases by 0.81%. In addition, humidity changes relative to high temperatures are detected more significantly than at low temperatures. The power plant studied is installed in Cartagena, Colombia and since it is not operating in the design environmental conditions (15 °C and 60% relative humidity) it experiences a loss of output power of 6140 kW and a drop in thermal efficiency of 5.12 %. These results allow considering the implementation of air cooling technologies at the compressor inlet to compensate for the loss of power at atmospheric air conditions.

Theoretically Estimating the Performance of Gas Turbines Under Varying Atmospheric Conditions

1976 ◽  
Vol 98 (1) ◽  
pp. 69-78 ◽  
Author(s):  
I. Ushiyama
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Internal Combustion Engines ◽  
Pressure Ratio ◽  
Atmospheric Temperature ◽  
Atmospheric Conditions ◽  
Variable Speed ◽  
Basic Study ◽  
Specific Output ◽  
Reciprocating Engines

It is well known that the performance of internal combustion engines is affected by varying atmospheric conditions, namely by the atmospheric temperature, pressure, and humidity. However, except for variable-speed gas turbines, performance correction formulas have not been established for gas turbines as they have for reciprocating engines. Although performance correction formulas, based on dimensional analysis, have been proposed for variable-speed gas turbines, these formulas are not applicable to the constant-speed gas turbines which are commonly used to drive generators. The correction quantities of gas turbines must be obtained experimentally. But, in general, a gas turbine, compared to a reciprocating engines, consumes such a large amount of air that conducting experiments at various atmospheric conditions in an environmental laboratory is hardly feasible. Therefore it is necessary to establish highly accurate performance correction formulas theoretically. The purpose of this paper, as a basic study in the development of correction formulas, is to analyze theoretically the effects of atmospheric conditions on the performance of gas turbines. For the purpose of analysis, the following concepts are introduced: (1) the use of moist air in place of dry air as the working medium, thus enabling one to estimate the effects of humidity; (2) the idea of “the specific output per unit volume” in addition to the specific output per unit mass and the thermal efficiency; (3) the effect of air temperature on the pressure ratio and the efficiency of the compressor. In the performance analysis, the following two methods are adopted: first, the changes in the efficiencies of the components are neglected while varying atmospheric conditions; second, as a more precise method, the changes in the efficiencies of the components are also considered. Finally, in order to confirm the validity of the assumptions and the calculation methods, the theoretical values obtained are compared with actual gas turbine data. As the result of this paper, the effects of varying atmospheric conditions on the performance of gas turbines are described quantitatively, so that the resultant change in performance can be estimated without experiment.

A Study of On-Line and Off-Line Turbine Washing to Optimize the Operation of a Gas Turbine

2005 ◽  
Author(s):  
Meherwan P. Boyce ◽  
Francisco Gonzalez
Keyword(s):  
Gas Turbine ◽  
Condition Monitoring ◽  
Thermal Efficiency ◽  
Heat Rate ◽  
Time Period ◽  
On Line ◽  
One Year ◽  
Gas Turbine Compressor ◽  
Isentropic Efficiency ◽  
Proper Condition

This paper highlights the procedure followed in order to establish an effective on-line and off line water wash program on a fleet of 36 small industrial turbines. To determine the efficacy of water washing a program of tests under controlled conditions was organized. With proper condition monitoring techniques, a set of tests were developed in order to identify the proper water wash frequency and the dissolving agent used to water wash. The goal of the water wash program is to maximize turbine power, and efficiency; while minimizing maintenance labor, and material. The Gas Turbine Compressor Isentropic Efficiency, the overall heat rate, and the overall thermal efficiency were used to compare the tests and evaluate the performance of different water wash frequencies and solvents. 8760 points defined each test as the data was taken over a one year time period, at a one hour interval.

scholarly journals Analysis of Ambient Temperature Effect on Gas Turbine Centaur 40 at Sepinggan Production Field, Chevron Indonesia Company

2019 ◽  
Vol 3 (2) ◽  
pp. 29
Author(s):  
Muhammad Adib
Keyword(s):  
Ambient Temperature ◽  
Gas Turbine ◽  
Fuel Consumption ◽  
Thermal Efficiency ◽  
Gas Flow ◽  
Specific Fuel Consumption ◽  
Ambient Temperatures ◽  
Optimal Output ◽  
Power Turbine ◽  
Calculation Results

               Gas turbine Centaur 40 drive gas compressor operates 24 hours a day and continuously with monitored output parameters, namely pressure and the gas flow capacity In its operation, it is often found that the optimal output parameters are generated during low ambient temperatures, for example in the night, cloudy and rainy. This study is aimed to determine the effect of changes in ambient temperature on the gas turbine power. During operation and research was done, the independent variable used is ambient temperature at 24 – 33 0C at constant 100% rotation of the turbine shaft. The decrease in gas turbine performance is seen from the increase in Specific Fuel Consumption (SFC), a decrease in the power produced and thermal efficiency. Specific fuel consumption value from the calculation results is 0.06072 kg/kW.h at 24 0C ambient temperature and 0.06565 kg/kW.h at 33 0C ambient temperature. Power produced by the power turbine is 3532,657 HP at 24 0C ambient temperature and 3046,557 HP at 33 0C ambient temperature, while the thermal efficiency cycle is 54,159% at 24 0C ambient temperature and 49,727% at 33 0C ambient temperature. Keywords: gas turbine, ambient temperature, specific fuel consumption, thermal efficiency.

Design of the EGT Typhoon 2-Shaft Power Turbine Using Concurrent Engineering Techniques

1993 ◽  
Author(s):  
S. J. Carson
Keyword(s):  
Power Generation ◽  
Gas Turbine ◽  
Concurrent Engineering ◽  
Thermal Efficiency ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Gas Industry ◽  
Power Turbine ◽  
Shaft Power ◽  
Very High

The Typhoon is a high thermal efficiency, low component count gas turbine originally launched into service in 1990. The single shaft version, used for power generation (C.H.P.), is rated at 4.1 MW ISO zero loss with a thermal efficiency of 32 per cent. At the date of writing, the Typhoon single shaft machines have accumulated 60,000 hours and 2,500 starts in service with very high levels of reliability. This paper describes the design of the two shaft version of the Typhoon, intended for operation primarily in the Oil and Gas Industry. The paper will concentrate on the “Concurrent Engineering” techniques used during the design process. The two shaft Typhoon will enter into service in 1994.

A Study of On-Line and Off-Line Turbine Washing to Optimize the Operation of a Gas Turbine

2005 ◽  
Vol 129 (1) ◽  
pp. 114-122 ◽  
Author(s):  
Meherwan P. Boyce ◽  
Francisco Gonzalez
Keyword(s):  
Gas Turbine ◽  
Condition Monitoring ◽  
Thermal Efficiency ◽  
Heat Rate ◽  
Water Washing ◽  
Time Period ◽  
On Line ◽  
Gas Turbine Compressor ◽  
Isentropic Efficiency ◽  
Proper Condition

This paper highlights the procedure followed in order to establish an effective on-line and off line water wash program on a fleet of 36 small industrial turbines. To determine the efficacy of water washing, a program of tests under controlled conditions was organized. With proper condition monitoring techniques, a set of tests were developed in order to identify the proper water wash frequency and the dissolving agent used to water wash. The goal of the water wash program is to maximize turbine power, and efficiency, while minimizing maintenance labor, and material. The gas turbine compressor isentropic efficiency, the overall heat rate, and the overall thermal efficiency were used to compare the tests and evaluate the performance of different water wash frequencies and solvents. 8760 points defined each test as the data were taken over a 1yr time period, at a 1h interval.

scholarly journals Gas Turbine Tubular Combustor Main Injector Optimization for Low Emission Combustion

2018 ◽  
Vol 26 (10) ◽  
pp. 1-12
Author(s):  
Arkan Khikhal Husain ◽  
Mahmood Attallah Mashkoor ◽  
Fuad Abdul Ameer Khalaf
Keyword(s):  
Gas Turbine ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
High Performance ◽  
Atmospheric Conditions ◽  
Air Mass ◽  
Fuel Flow ◽  
Low Emission ◽  
Gas Fuel

This work presents the experimental investigation results of high performance and low emission colorless combustion in a gas turbine tubular combustor at atmospheric conditions. Low emission and colorless oxidation reaction is characterized by dispersed flame and temperature under the conditions of preheated air. System performance, emissions of CO and UHC are recorded up to achieve low emission colorless combustion, the flame capturing, Measurements of temperature, inlet air mass flow rate and gas fuel LPG flow rate for variable of fuel main injector holes diameter. concluded that maximal air mass flow rate, with choked fuel flow in the main injector for each cases promotes the formation of colorless pal blue flame combustion, for 3.2 g/s of fuel flow rate with 6 holes and 1mm main injector holes diameter and lower CO emissions and decreasing in UHC emissions (70 → 10) ppmv with increasing in power generation (0.5 → 3.42) kW and decreasing in S.F.C. (21.5 → 3.49) kg/kwh.

Assessing the Potential of Gas-Recuperation in Reheated Gas Turbines Within Combined Gas-Steam Power Plants

2014 ◽  
Author(s):  
Adam Doligalski ◽  
Luis Sanchez de Leon ◽  
Pavlos K. Zachos ◽  
Vassilios Pachidis
Keyword(s):  
Gas Turbine ◽  
Thermal Efficiency ◽  
Gas Turbines ◽  
Power Plants ◽  
Current Approach ◽  
Combined Cycle ◽  
Variable Position ◽  
Power Turbine ◽  
Power Generation Systems ◽  
Gas Turbine Cycle

This paper presents a comparative analysis between two different gas turbine configurations for implementation within combined cycle power plants, aiming to downselect the most promising one in terms of thermal efficiency at design point. The analysed gas turbines both feature the same dual-pressure steam bottoming cycle, but differ in the gas turbine cycle itself: the first configuration comprises a single-shaft reheated gas turbine with variable position of the reheater (representative of the current approach of the industry to combined cycle power plants), whilst the second configuration comprises a dual-shaft reheated-recuperated engine with free power turbine. Comparison of the two competing gas turbine configurations is conducted by means of systematic exploration of the combined cycle design space. The analysis showed that the reheated-recuperated configuration delivers higher thermal efficiency than the more conventional reheated (non-recuperated) gas turbine and is identified, therefore, as a competitive option for future combined cycle power generation systems.

Performance of a High-Efficiency Radial/Axial Turbine

1987 ◽  
Vol 109 (2) ◽  
pp. 151-154 ◽  
Author(s):  
C. Rodgers ◽  
R. Geiser
Keyword(s):  
Gas Turbine ◽  
Test Performance ◽  
High Efficiency ◽  
Ambient Pressure ◽  
Two Stage ◽  
Axial Turbine ◽  
Turbine Performance ◽  
Exhaust Duct ◽  
Power Turbine ◽  
Isentropic Efficiency

This paper presents the test performance of a lightly loaded, combination radial/axial turbine for a 420-hp, two-shaft gas turbine. This two-stage turbine configuration, which included an interstage duct and an exhaust duct discharging vertically to ambient pressure conditions, was shown to be capable of attaining an overall isentropic efficiency of 89.7 percent. The influence of exhaust diffuser struts on the turbine performance under stalled power turbine conditions was shown to significantly affect compressor and turbine matching.

Evolution and Experience of the Mars 100LS Gas Turbine

1994 ◽  
Author(s):  
Malcolm D. Jones ◽  
Greg P. Pytanowski ◽  
Doyle L. Files ◽  
Jay M. Wilson
Keyword(s):  
Power Generation ◽  
Gas Turbine ◽  
Output Power ◽  
Thermal Efficiency ◽  
Electrical Power ◽  
Combustion System ◽  
Gas Compression ◽  
Power Turbine ◽  
Industrial Gas Turbine ◽  
Continuous Product

Solar’s Mares 100LS industrial gas turbine rated at 11.2 MW (15,000 hp) and 34% thermal efficiency at ISO conditions is the latest model Mars gas turbine evolved from an ongoing program of planned continuous product improvement. Since the Mars gas turbine was introduced in 1978, over 250 units have been ordered and approximately 4 million hours of field experience have been logged with packages designed for gas compression, pump drive, and electrical power generation. This paper updates the description of the Mars gas turbine to include the three latest enhancements: redesign of the first two compressor stages for increased output power and efficiency; SoLoNOx (dry low NOx, antipollution) combustion system: and a new low speed power turbine to improve output drive versatility.

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