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1
Content available Air bottoming combined cycle performance analyses by the combined effect of variable parameters
Khan Mohammad N, Alzafiri Dhare
Archive of Mechanical Engineering
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2022
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LXIX, nr 3
497--517
EN
To meet the continuous demand for energy of industrial as well as commercial sectors, researchers focus on increasing the power generating capacity of gas turbine power plants. In this regard, the combined cycle is a better solution in terms of environmental aspects and power generation as compared to a simple gas turbine power plant. The present study is the thermodynamic investigation of five possible air bottoming combined cycles in which the topping cycle is a simple gas turbine cycle, regenerative gas turbine cycle, inter-cool gas turbine cycle, reheat gas turbine cycle, and intercool-reheat gas turbine cycle. The effect of pressure ratio of the topping cycle, the turbine inlet temperature of topping cycle, and ambient temperature on net power output, thermal efficiency, total exergy destruction, and exergetic efficiency of the combined cycle have been analyzed. The ratio of the net power output of the combined cycle to that of the topping cycle is maximal in the case when the topping cycle is a simple gas turbine cycle. The ratio of net power output and the total exergy destruction of the combined cycle to those of the topping cycle decrease with pressure ratio for all the combinations under study except for the case when the topping cycle is the regenerative gas turbine cycle.
2
Content available remote Thermo-economic optimization of air bottoming cycles
Saghafifar M., Poullikkas A.
Journal of Power Technologies
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2015
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Vol. 95, nr 3
211--220
EN
In this work a thermo–economic optimization analysis is performed on two air bottoming cycle (ABC) configurations with and without intercooler in the bottoming cycle. Thermo-economic optimization modeling is developed and the effect of the mass flow rate ratio of bottoming cycle air mass flow rate with respect to the topping cycle air mass flow rate is examined in terms of both ABC plant efficiency and total operation cost.
3
Content available Thermo-economic comparative analysis of gas turbine GT10 integrated with air and steam bottoming cycle
Czaja D., Chmielnak T., Lepszy S.
Archives of Thermodynamics
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2014
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Vol. 35, no. 4
83--95
EN
A thermodynamic and economic analysis of a GT10 gas turbine integrated with the air bottoming cycle is presented. The results are compared to commercially available combined cycle power plants based on the same gas turbine. The systems under analysis have a better chance of competing with steam bottoming cycle configurations in a small range of the power output capacity. The aim of the calculations is to determine the final cost of electricity generated by the gas turbine air bottoming cycle based on a 25 MW GT10 gas turbine with the exhaust gas mass flow rate of about 80 kg/s. The article shows the results of thermodynamic optimization of the selection of the technological structure of gas turbine air bottoming cycle and of a comparative economic analysis. Quantities are determined that have a decisive impact on the considered units profitability and competitiveness compared to the popular technology based on the steam bottoming cycle. The ultimate quantity that can be compared in the calculations is the cost of 1 MWh of electricity. It should be noted that the systems analyzed herein are power plants where electricity is the only generated product. The performed calculations do not take account of any other (potential) revenues from the sale of energy origin certificates.
4
Content available remote Operation of a gas turbine air bottoming cycle at part load
Czaja D., Chmielniak T., Lepszy S.
Journal of Power Technologies
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2013
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Vol. 93, nr 5
279--287
EN
The purpose of this study is to analyze the performance characteristics of a gas turbine air bottoming cycle operating at part load conditions. The most effective option in terms of the energy efficiency of each installation is operating with a nominal load. Various applications have other needs. For example marine gas turbines should characterized by high value of efficiency in a wide range of load. There are many other examples of installation which spend most of time at power levels significantly lower than maximum. This paper presents two-shaft gas turbine air bottoming cycle. The gas turbine is coupled to the air part by means of an air heat exchanger. This configuration allows the gas turbine operating at nominal load while the cycle power output is regulated by air turbine part load. However, due to the fact that the mechanical power output ratio of the air turbine and the gas turbine is about 0.17-0.20 it is necessary to consider a variant where the gas turbine also operates at part load. Chosen results are summarized and compared with a standalone gas turbine unit.
5
Content available Selection of the air heat exchanger operating in a gas turbine air bottoming cycle
Chmielniak T., Czaja D., Lepszy S.
Archives of Thermodynamics
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2013
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Vol. 34, no. 4
93--106
EN
A gas turbine air bottoming cycle consists of a gas turbine unit and the air turbine part. The air part includes a compressor, air expander and air heat exchanger. The air heat exchanger couples the gas turbine to the air cycle. Due to the low specific heat of air and of the gas turbine exhaust gases, the air heat exchanger features a considerable size. The bigger the air heat exchanger, the higher its effectiveness, which results in the improvement of the efficiency of the gas turbine air bottoming cycle. On the other hand, a device with large dimensions weighs more, which may limit its use in specific locations, such as oil platforms. The thermodynamic calculations of the air heat exchanger and a preliminary selection of the device are presented. The installation used in the calculation process is a plate heat exchanger, which is characterized by a smaller size and lower values of the pressure drop compared to the shell and tube heat exchanger. Structurally, this type of the heat exchanger is quite similar to the gas turbine regenerator. The method on which the calculation procedure may be based for real installations is also presented, which have to satisfy the economic criteria of financial profitability and cost-effectiveness apart from the thermodynamic criteria.
6
Content available The use of air-bottoming cycle as a heat source for the carbon dioxide capture installation of a coal-fired power unit
Chmielniak T., Lepszy S., Czaja D.
Archives of Thermodynamics
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2011
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Vol. 32, no. 3
89-101
EN
The installations of CO2 capture from flue gases using chemical absorption require a supply of large amounts of heat into the system. The most common heating medium is steam extracted from the cycle, which results in a decrease in the power unit efficiency. The use of heat needed for the desorption process from another source could be an option for this configuration. The paper presents an application of gas-air systems for the generation of extra amounts of energy and heat. Gas-air systems, referred to as the air bottoming cycle (ABC), are composed of a gas turbine powered by natural gas, air compressor and air turbine coupled to the system by means of a heat exchanger. Example configurations of gas-air systems are presented. The efficiency and power values, as well as heat fluxes of the systems under consideration are determined. For comparison purposes, the results of modelling a system consisting of a gas turbine and a regenerative exchanger are presented.
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