Load-regulation characteristics of gas turbine combined cycle power system controlled with compressor inlet air heating

2021 ◽  
pp. 117285
Author(s):  
Kunle Fan ◽  
Cheng Yang ◽  
Zhuli Xie ◽  
Xiaoqian Ma
Keyword(s):  
Power System ◽  
Gas Turbine ◽  
Combined Cycle ◽  
Air Heating ◽  
Compressor Inlet ◽  
Load Regulation

Performance Benefit Assessment of Ceramic Components in an MS9001FA Gas Turbine

1998 ◽  
Author(s):  
Clayton M. Grondahl ◽  
Toshiaki Tsuchiya
Keyword(s):  
Power Plant ◽  
Gas Turbine ◽  
Combined Cycle ◽  
Plant Performance ◽  
Cooling Flow ◽  
Standard Design ◽  
Ceramic Components ◽  
Compressor Inlet ◽  
Turbine Component ◽  
Plant Configuration

The introduction of a ceramic gas turbine component in commercial power generation service will require significant effort. A careful assessment of the power plant performance benefit achievable from the use of ceramic components is necessary to rationalize the priority of this development compared to other alternatives. This paper overviews a study in which the performance benefit from ceramic components was evaluated for an MS9001FA gas turbine in a combined cycle power plant configuration. The study was performed with guidelines of maintaining constant compressor inlet airflow and turbine exit NOx emissions, effectively setting the combustion reaction zone temperature. Cooling flow estimates were calculated to maintain standard design life expectancy of all components. Monolithic silicon nitride ceramic was considered for application to the transition piece, stage one and two buckets, nozzles and shrouds. Performance benefit was calculated both for ceramic properties at 1093C (2200F) and for the more optimistic 1315C (2400F) oxidatian limit of the ceramic. Hybrid ceramic-metal components were evaluated in the less optimistic case.

Study on Effects of Compressor Inlet Air Cooling on GTCC System Performance Under Different Environmental Conditions

2020 ◽  
Author(s):  
Duan Liqiang ◽  
Guo Yaofei ◽  
Pan Pan ◽  
Li Yongxia
Keyword(s):  
Relative Humidity ◽  
Ambient Temperature ◽  
Gas Turbine ◽  
Output Power ◽  
Environmental Conditions ◽  
System Performance ◽  
Combined Cycle ◽  
Air Cooling ◽  
Compressor Inlet ◽  
Cooling Technology

Abstract The environmental conditions (air temperature and relative humidity) have a great impact on the power and efficiency of gas turbine combined cycle (GTCC) system. Using the intake air cooling technology can greatly improve the performance of GTCC system. On the base of the PG9351FA gas turbine combined cycle system, this article builds the models of both the GTCC system and a typical lithium bromide absorption refrigeration system using Aspen Plus software. The effects of compressor inlet air cooling with different environmental conditions on the GTCC system performance are studied. The research results show that using the inlet air cooling technology can obviously increase the output powers of both the gas turbine and the combined cycle power. When the ambient humidity is low, the efficiency of GTCC changes gently; while the ambient humidity is high, the GTCC system efficiency will decline substantially when water in the air is condensed and removed with the progress of cooling process. At the same ambient temperature, when the relative humidity of the environment is equal to 20%, the gas turbine output power is increased by 35.64 MW, with an increase of 16.32%, and the combined cycle output power is increased by 39.57 MW, with an increase of 11.34%. At an ambient temperature of 35°C, for every 2.5 °C drop in the compressor inlet air, the thermal efficiency of the gas turbine increases by 0.189% compared to before cooling.

Design/off-design performance simulation and discussion for the gas turbine combined cycle with inlet air heating

Energy ◽  
2019 ◽  
Vol 178 ◽  
pp. 386-399 ◽  
Author(s):  
Yongping Yang ◽  
Ziwei Bai ◽  
Guoqiang Zhang ◽  
Yongyi Li ◽  
Ziyu Wang ◽  
...  
Keyword(s):  
Gas Turbine ◽  
Combined Cycle ◽  
Performance Simulation ◽  
Design Performance ◽  
Air Heating

scholarly journals Effect of Turbine and Compressor Inlet Temperatures and Air Bleeding on the Comparative Performance of Simple and Combined Gas Turbine Unit

2020 ◽  
Vol 5 (12) ◽  
pp. 39-45
Author(s):  
Basharat Salim ◽  
Jamal Orfi ◽  
Shaker Saeed Alaqel
Keyword(s):  
Power Plant ◽  
Gas Turbine ◽  
Energy Demand ◽  
Power Plants ◽  
Turbine Unit ◽  
Combined Cycle ◽  
Inlet Temperature ◽  
Gas Turbine Unit ◽  
The World ◽  
Compressor Inlet

The proper utilization of all the available forms of energy resources has become imminent to meet the power requirement and energy demand in both the developed and developing countries of the world. Even though the emphasis is given to the renewable resources in most parts of the world, but fossil fuels will still remain the main resources of energy as these can meet both normal and peak demands. Saudi Arab has number of power plant based on natural gas and fuel that are spread in all its regions. These power plants have aeroderivative gas turbine units supplied by General Electric Company as main power producing units. These units work on dual fuel systems. These units work as simple gas turbine units to meat peak demands and as part of combined cycle otherwise. The subject matter of this study is the performance of one of the units of a power plant situated near Riyadh city of Saudi Arab. This unit also works both as simple gas turbine unit and as a part of combined cycle power plant unit. A parametric based performance evaluation of the unit has been carried out to study both energetic and exergetic performance of the unit for both simple and combined cycle operation. Effect of compressor inlet temperature, turbine inlet temperature, pressure ratio of the compressor, the stage from which bleed off air have been taken and percentage of bleed off air from the compressor on the energetic and exergetic performance of the unit have been studied. The study reveals that all these parameters effect the performance of the unit in both modes of operation.

Improving Combined Cycle Part Load Performance by Using Exhaust Gas Recirculation Through an Ejector

2021 ◽  
Author(s):  
Majed Sammak ◽  
Chi Ho ◽  
Alaaeldin Dawood ◽  
Abdurrahman Khalidi
Keyword(s):  
Gas Turbine ◽  
Heat Rate ◽  
Heating System ◽  
Combined Cycle ◽  
Exhaust Gas ◽  
Entrainment Ratio ◽  
Ambient Temperatures ◽  
Air Heating ◽  
Rate Improvement ◽  
Gas Recirculation

Abstract The gas turbine inlet air heating system has been used for improving the combined cycle heat rate at part load operation, which has a positive impact on the combined cycle profitability and fuel consumption. The paper objective was to introduce a new gas turbine inlet air heating system. The inlet air heating system studied in this paper was exhaust gas recirculation into inlet air compressor through an ejector. The ejector motive flow was defined as the compressor bleed air from the compressor discharge section while the ejector entrainment flow was defined as the recirculated exhaust gases from the gas turbine exhaust duct. This study was performed on generic gas turbine and combined cycle model. The selected combined cycle model was 1-on-1 (one gas turbine, one heat recovery steam generator and one steam turbine train). The heat recovery steam generator was a 3-pressure level with reheat. The combined cycle heat rate improvement at different ejector entrainment ratio varying from 0.5 to 5 with 0.5 intervals was studied. The selected ejector area ratio was set to 25 which together with the motive to suction pressure ratio gave an entrainment ratio of 2.5. The selected ejector entrainment ratio of 2.5 was aligned with the common practice design of the ejectors. The ejector motive flow was limited to 1% of compressor inlet air flow. Furthermore, the combined cycle heat rate improvement at different combined cycle loads were analysed. The analysis was performed on combined cycle loads from 90% to 40% load with a 10% interval and at the ambient temperatures 7°C, 15°C and 35°C. At the ambient temperatures 7°C, 15°C and 35°C, the combined cycle heat rate improvement was measured at loads below 80%. The combined cycle heat rate improvements proved greater at lower combined cycle loads and lower ambient temperatures. The combined cycle heat rate improvement was 0.67% at the ambient temperature 15°C and 60% combined cycle load. On the other hand, the combined cycle heat rate improvement was 1.4% at 40% combined cycle load and ambient temperature 7°C.

scholarly journals Effect of Inlet Air Heating on Gas Turbine Efficiency under Partial Load

Energies ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 3327 ◽  
Author(s):  
ZhiTan Liu ◽  
XiaoDong Ren ◽  
ZhiYuan Yan ◽  
HongFei Zhu ◽  
Tao Zhang ◽  
...  
Keyword(s):  
Gas Turbine ◽  
Waste Heat ◽  
Heating Temperature ◽  
Calculation Model ◽  
Combined Cycle ◽  
Characteristic Curves ◽  
Turbine Efficiency ◽  
Air Heating ◽  
Partial Load ◽  
Heating Technology

A novel heating technology is presented to analyze the influence of inlet air heating on gas turbine efficiency under partial load. This technology uses the waste heat of a low-temperature heat sources, which includes but is not limited to the exhaust gas of a combined-cycle heat-recovery steam generator or a single-cycle gas turbine. A calculation model of the equilibrium running point is used for the given load and the characteristic curves of the compressor and the turbine to study the mechanism of the inlet air heating technology. Then, the equilibrium running line is calculated and drawn in the characteristic curves of the compressor and the turbine. The factors for gas turbine efficiency are discussed through the calculated equilibrium running line. The results show that an increase in inlet air temperature has considerable potential for improving gas turbine efficiency due to the increase in compressor and turbine efficiency. This finding is different from traditional viewpoints. Meanwhile, each partial load has an optimum heating temperature which becomes higher when the load is lower.

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