Development and Application of Life-Assessment Guidelines for Fossil-Fuel Power Plant Facilities in Korea

Choi, Woosung; Song, Geewook; Kim, Bum-Shin; Hyun, Jung-Seob; Heo, Jae-Sil

doi:10.3795/ksme-a.2010.34.9.1265

Cited by 5 publications

(1 citation statement)

References 2 publications

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“…As the superheated steam is used, the turbine's thermal drop increases, its internal efficiency increases, the friction loss between the turbine and the steam supply pipe decreases, and the erosion by moisture is reduced, allowing it to operate at high temperatures and pressures [6]. Meanwhile, the design life of a supercritical standard coal-fired power plant is 30 years, and after 20 years of operation the aging process accelerates, requiring power plant life management [7].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Platen Superheater Tube Degradation in Thermal Power Plants via Destructive/Non-Destructive Characteristic Evaluation

Kim

Han

et al. 2022

Materials

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Coal-fired power plants operating under Korea’s standard supercritical pressure operate in a high-temperature environment, with steam temperatures reaching 540 °C. A standard coal-fired power plant has a 30-year design life, and lifespan diagnosis is performed on facilities that have operated for more than 100,000 h or 20 years. Visual inspection, thickness measurements, and hardness measurements in the field are used to assess the degree of material degradation at the time of diagnosis. In this study, aging degradation was assessed using an electromagnetic acoustic transducer to measure the change in transverse ultrasonic propagation speed, and the results were compared to microstructural analysis and tensile test results. Based on the experimental results, it was found that the boiler tube exposed to a high-temperature environment during long-term boiler operation was degraded and damaged, the ultrasonic wave velocity was reduced, and the microstructural grains were coarsened. It was also confirmed through tensile testing that the tensile and yield strengths increased with degradation. Our findings prove that the degree of change in mechanical properties as a function of the material’s degradation state is proportional to the change in ultrasonic wave velocity.

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Section: Introductionmentioning

confidence: 99%

Analysis of Platen Superheater Tube Degradation in Thermal Power Plants via Destructive/Non-Destructive Characteristic Evaluation

Kim

Han

et al. 2022

Materials

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A Bayesian approach for a damage growth model using sporadically measured and heterogeneous on-site data from a steam turbine

choi

Youn

et al. 2019

Reliability Engineering & System Safety

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Study on Creep Damage Model of 1Cr1Mo1/4V Steel for Turbine Rotor

choi¹,

Fleury²,

Song³

et al. 2011

Transactions of the Korean Society of Mechanical Engineers A

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It is well known that the dominant damage mechanisms in high-temperature steam turbine facilities such as rotor and casing are creep and fatigue damages. Even though coupling of creep and fatigue should be considered while predicting the life of turbine facilities, the remaining life of large steam turbine facilities is generally determined on the basis of creep damage because the turbines must generate stable base-load power and because they are operated at a high temperature and pressure for a long time. Almost every large steam turbine in Korea has been operated for more than 20 years and is made of steel containing various amounts of principal alloying elements nickel, chromium, molybdenum, and vanadium. In this study, creep damage model of 1Cr1Mo1/4V steel for turbine rotor is proposed and that can assess the high temperature creep life of large steam turbine facilities is proposed.

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Development and Application of Life-Assessment Guidelines for Fossil-Fuel Power Plant Facilities in Korea

Cited by 5 publications

References 2 publications

Analysis of Platen Superheater Tube Degradation in Thermal Power Plants via Destructive/Non-Destructive Characteristic Evaluation

Analysis of Platen Superheater Tube Degradation in Thermal Power Plants via Destructive/Non-Destructive Characteristic Evaluation

A Bayesian approach for a damage growth model using sporadically measured and heterogeneous on-site data from a steam turbine

Study on Creep Damage Model of 1Cr1Mo1/4V Steel for Turbine Rotor

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