Development of Advanced TBC for 1650 °C Class Gas Turbine

Okajima, Yoshifumi; Torigoe, Taiji; Mega, Masahiko; Kuwabara, Masamitsu; Okaya, Naotoshi

doi:10.31399/asm.cp.itsc2021p0695

Cited by 4 publications

(2 citation statements)

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“…Recently, the development of heat resistant alloys, hot gas path cooling systems and thermal barrier coatings has allowed a working flow temperature increase from 800 to 1650 • C [10,11]. Foreign advanced CCGT facilities have recently reached net efficiency of 63-64% [12,13]. CCGT facilities based on the 9HA02 or M701JAC Gas Turbines (GT) have electric net efficiency above 64% [11,14,15], which is the highest performance among the commercially available gas fuel power production technologies.…”

Section: Increasing Efficiency Of the Binary Power Cyclesmentioning

confidence: 99%

Research and Development of Trinary Power Cycles

et al. 2022

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The most effective and environmentally safe fossil fuel power production facilities are the combined cycle gas turbine (CCGT) ones. Electric efficiency of advanced facilities is up to 58% in Russia and up to 64% abroad. The further improvement of thermal efficiency by increase of the gas turbine inlet temperature (TIT) is limited by performance of heat resistance alloys that are used for the hot gas path components and the cooling system efficiency. An alternative method for the CCGT efficiency improvement is utilization of low potential heat of the heat recovery steam generator (HRSG) exhaust gas in an additional cycle operating on a low-boiling heat carrier. This paper describes a thermodynamic analysis of the transition from binary cycles to trinary ones by integration of the organic Rankine cycle (ORC). A mathematical model of a cooled gas turbine plant (GT) has been developed to carry out calculations of high-temperature energy complexes. Based on the results of mathematical modeling, recommendations were made for the choice of the structure and parameters of the steam turbine cycle, as well as the ORC, to ensure the achievement of the maximum thermal efficiency of trinary plants. It is shown that the transition from a single pressure CCGT to a trinary plant allows the electric power increase from 213.4 MW to 222.7 MW and the net efficiency increase of 2.14%. The trinary power facility has 0.45% higher efficiency than the dual pressure CCGT.

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Section: Increasing Efficiency Of the Binary Power Cyclesmentioning

confidence: 99%

Research and Development of Trinary Power Cycles

et al. 2022

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“…Today, most of the electrical and thermal energy in the world is generated at thermal power plants, with its share in generation being more than 60%. The combined cycle gas turbine (CCGT) process remains the most efficient fuel energy conversion technology at the moment, the net electrical efficiency of which can reach 64% [3,4]. Such a high level is due, first of all, to high initial parameters (the temperature at the gas turbine unit (GTU) inlet can reach 1650 • C [5,6]).…”

Section: Introductionmentioning

confidence: 99%

Feasibility Study of Scheme and Regenerator Parameters for Trinary Power Cycles

et al. 2023

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Natural gas-fired combined cycle plants are nowadays one of the most efficient and environmentally friendly energy complexes. High energy efficiency and low specific emissions are achieved primarily due to the high average integral temperature of heat supply in the Brayton–Rankine cycle. In this case, the main sources of energy losses are heat losses in the condenser of the steam turbine plant and heat losses with the exhaust gases of the waste heat boiler. This work is related to the analysis of the thermodynamic and economic effects in the transition from binary to trinary cycles, in which, in addition to the gas and steam–water cycles, there is an additional cycle with a low-boiling coolant. A method for the feasibility study of a waste heat recovery unit for trinary plants is proposed. The schematic and design solutions described will ensure the increased energy and economic performance of combined cycle power plants. Based on the results of the thermodynamic optimization of the structure and parameters of thermal schemes, it was found that the use of the organic Rankine cycle with R236ea freon for the utilization of the low-grade heat of a trinary plant’s exhaust gases operating from a GTE-160 gas turbine makes it possible to achieve a net electrical efficiency of 51.3%, which is a 0.4% higher efficiency for a double-circuit combined cycle gas turbine plant and a 2.1% higher efficiency for a single-circuit cycle with similar initial parameters. On the basis of the conducted feasibility study, the parameters and characteristics of the heat exchangers of the regenerative system of the waste heat recovery unit are substantiated. The use of plain fin-and-tube heat exchangers in the regenerative system of the utilization cycle is the most promising solution. It was found that the level of allowable pressure loss in the regenerator of 10 kPa and the degree of regeneration of 80% allow for maximum economic efficiency of the waste heat recovery unit.

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Thermodynamic Analysis of a Trinary Power Plant

Kindra,

Komarov,

Zlyvko

et al. 2024

Izvestiâ Akademii nauk SSSR. Ènergetika

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Combined-cycle plants operating on natural gas are today one of the most efficient and environmentally friendly energy systems. High energy efficiency and low specific emissions are achieved primarily due to the high average integral temperature of heat supply in the Brayton-Rankine cycle. In this case, the main sources of energy losses are heat losses in the condenser of a steam turbine unit and heat losses with the exhaust gases of the waste heat boiler. This work is devoted to the thermodynamic analysis of the transition from traditional binary cycles to trinary ones, in which, in addition to the gas and steam-water circuits, there is an additional circuit using a low-boiling coolant. Based on the results of the thermodynamic optimization of the structure and parameters of thermal circuits, it was established that the use of an organic Rankine cycle with R236ea freon to utilize the low-grade heat of exhaust gases of a power plant operating with a gas turbine GTE-160 allows achieving a net electrical efficiency of 51.3%, which is higher the efficiency of single-circuit CCGT units with similar initial parameters is by 2.2% and double-circuit CCGT units by 0.5%. The increased level of energy efficiency is due to an increase in the thermal efficiency of the steam turbine part due to the addition of low-pressure heaters, as well as the effective utilization of heat from exhaust gases in a circuit with a low-boiling coolant.

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Development of Advanced TBC for 1650 °C Class Gas Turbine

Cited by 4 publications

References 0 publications

Research and Development of Trinary Power Cycles

Research and Development of Trinary Power Cycles

Feasibility Study of Scheme and Regenerator Parameters for Trinary Power Cycles

Thermodynamic Analysis of a Trinary Power Plant

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