Shape and operation optimisation of a supercritical steam turbine rotor

Nowak, Grzegorz; Rusin, Andrzej

doi:10.1016/j.enconman.2013.06.037

Cited by 30 publications

(16 citation statements)

References 6 publications

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“…In order to meet the increasing challenge to reduce CO 2 emission, ultra-spercritical (USC) coal fired power plants with higher efficiency are developed [1][2][3]. By increasing the steam temperature and pressure entering into the turbines, the efficiency can be improved significantly [4].…”

Section: Introductionmentioning

confidence: 99%

Creep behavior and microstructure evaluation of welded joint in dissimilar modified 9Cr–1Mo steels

Liu

et al. 2015

Materials Science and Engineering: A

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Section: Introductionmentioning

confidence: 99%

Creep behavior and microstructure evaluation of welded joint in dissimilar modified 9Cr–1Mo steels

Liu

et al. 2015

Materials Science and Engineering: A

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“…The second step was a preliminary selection of the design structural form of rotors. Presenting research results works concerning the optimization of the form of the rotor design are included, among others, in [1]. The design form of the rotor and its operating conditions have a direct impact on the stress state and, consequently, on its life.…”

Section: Introductionmentioning

confidence: 99%

Selection of the rotor heat-up rate for supercritical parameter turbines

Rusin¹,

Lipka

Łukowicz³

2013

Archives of Thermodynamics

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The paper presents the results of the numerical analyses for the steam turbine rotor, dedicated for the newly-designed 900 MW steam unit with supercritical steam parameters (650 o C, 30.0 MPa). Basing on the design calculations, an optimal design solution was determined. Review of the available literature on materials for turbine rotors with supercritical steam parameters was done. Then the start-ups of the turbine were simulated. Thermal and strength states were analyzed. As a result, an optimal start-up characteristic was obtained. Nomenclature m/mo -turbine feed steam mass flow to the nominal steam mass flow ratio n -number of stage, rotor revolutions p -live steam pressure R0.2 -yield stress t -time T -live steam temperatureGreek symbols σ -stress

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“…With the rapid development of the economy, human demand for electric energy is increasing, and carbon dioxide emissions have also led to increasingly serious environmental pollution [1]. To this end, there is an urgent need for the power industry to develop in the direction of high efficiency, low energy consumption and low pollution.…”

Section: Introductionmentioning

confidence: 99%

High cycle fatigue behavior of a dissimilar metal welded joint in ultra-supercritical steam turbine rotor

Wang

Zhu

et al. 2020

Mater. Res. Express

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The high cycle fatigue (HCF) property and microstructure of a dissimilar metal welded joint (DMWJ) for ultra-supercritical steam turbine rotor were systematically investigated in this paper. The DMWJ was fabricated using narrow gap submerged arc welding (NG-SAW) technique with buttering layer. Conditional fatigue strength of 30Cr1Mo1V (BM-1), buttering layer (BL), weld metal (WM) and 30Cr2Ni4MoV (BM-2) based on S-N curve was obtained by HCF tests at room temperature. The microstructure and second-phase carbide as well as fracture appearance of BM-1, BL, WM and BM-2 were characterized by optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscope (TEM). The results show that the BL has lower fatigue strength, which are related to more content of the soft ferrite and less content of the hard carbide. The acicular ferrite represents better fatigue properties than massive ferrite due to barrier effect. Additionally, dislocation density sharply increases near the carbides, grain boundaries, and lath structures resulting in dislocation tangle after HCF test, which helps to improve the fatigue strength of the welded joint. The carbide precipitated, aggregated, and grown in the grain boundaries promoted crack nucleation, reduced the crack propagation rate and affected the crack propagation path.

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Shape and operation optimisation of a supercritical steam turbine rotor

Cited by 30 publications

References 6 publications

Creep behavior and microstructure evaluation of welded joint in dissimilar modified 9Cr–1Mo steels

Creep behavior and microstructure evaluation of welded joint in dissimilar modified 9Cr–1Mo steels

Selection of the rotor heat-up rate for supercritical parameter turbines

High cycle fatigue behavior of a dissimilar metal welded joint in ultra-supercritical steam turbine rotor

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