Investigation of wet steam flow in a 300 MW direct air-cooling steam turbine. Part 1: Measurement principles, probe, and wetness

Cai, Xiaoshu; Ning, Tao; Niu, Fuhuan; Wu, Guangyuan; Song, Yanping

doi:10.1243/09576509jpe690

Cited by 23 publications

(17 citation statements)

References 9 publications

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“…The concentration of droplets increases a little too from the 400th second to the 500th second and then remains nearly constant at around 2.5 × 10 13 m −3 , and the volume mean diameter of droplets is about 0.85 µm at this stage. These results agree well with the measured results in other operation conditions [1]. Figure 6 shows the change in wetness fraction formed by heterogeneous nucleation in total wetness during the whole condensation process.…”

Section: The Stage Of Stable Homogeneous Condensationsupporting

confidence: 91%

“…In parts 1 and 2 of this series of articles, the measurement principles of multi-wavelength light extinction and the four-holes wedge probe, and the measurement results of wetness, droplet size distribution, inner efficiency of the LP cylinder in different operating conditions, the flow field, and the windage state have been presented [1,2].…”

Section: Introductionmentioning

confidence: 99%

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An investigation of wet steam flow in a 300 MW direct air-cooling steam turbine. Part 3: Heterogeneous/homogeneous condensation

Cai

Niu

Ning

et al. 2010

Proceedings of the Institution of Mechanical Engineers, Part A:

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Steam condensation in steam turbines is a complex problem and its process is still not clear. To investigate the condensation process in the steam turbine, measurements were carried out with an optical/pneumatic probe in a 300 MW direct air-cooling steam turbine by changing the backpressure from 42 to 24 kPa. The thermodynamic states of the exhaust steam were changed from superheat to wet steam too. The existence of heterogeneous condensation was demonstrated by the actual measurement results. The process of condensation in the steam turbine was found to be from heterogeneous condensation, to heterogeneous/homogeneous condensation and then to homogeneous condensation. The mean diameter of droplets formed by both condensations is completely different. During the transition stage from heterogeneous condensation to homogeneous condensation, all parameters have huge oscillation. Flow parameters of steam are strongly related to the condensation.

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Section: The Stage Of Stable Homogeneous Condensationsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

An investigation of wet steam flow in a 300 MW direct air-cooling steam turbine. Part 3: Heterogeneous/homogeneous condensation

Cai

Niu

Ning

et al. 2010

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…There has been significant progress in measurement technology and in the automated processing and evaluation of data. However, results from the experimental measurement of wet steam on components have not been published lately, with the exception of Hoznedl et al, 15 on a 1090 MW output steam turbine in a nuclear power station and, Cai et al, 16 on a 300 MW turbine with an air cooled condenser. Measurement of wet steam flow in power plants by the help of hot-wire system was presented by Uruba et al 17 The target of this study is partly to correct this failure.…”

Section: Introductionmentioning

confidence: 99%

Experimental research on the flow at the last stage of a 1090 MW steam turbine

Hoznedl

Kolovratník

Bartoš

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part A:

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This paper presents the experimental research for the flow of the last stage of a turbine for saturated steam with the nominal output 1090 MW. In addition, the flows in 600, 800, and 1070 MW output turbines were also measured. Pneumatic probes were used to determine the distribution of static pressures and absolute angles at the outlets from the penultimate and the last stages of the turbine. Optical probes were used to measure wetness distribution and were placed in positions similar to the pneumatic probes. The courses of static pressures, angles, and wetness for all outputs respectively were compared and discussed. The difference between wetness courses on the left and right side of the turbine as well as before and behind last stage was minimal. Absolute angles of steam behind the last stage are strongly influenced by the vacuum level in the condenser. Big difference between the outlet angles from last stage on the left and right side of the turbine is confirmed. The influence of the tie-boss was evident in both pneumatic and wetness measurements. Differences of the flow field on the left and right sides of the turbine behind the penultimate stage are noted and discussed. These differences lead to a dynamic loading of the penultimate rotor blades and could reduce the service life.

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“…For the reasons mentioned above it is recommended to obtain the boundary conditions from experimental measurements. They were in the past carried out on some turbines [1,2], recently results have been published only on 300 MW turbine with an air-cooling condenser [3,4]. There are of course many numerical simulations of flow that suitably solve the behaviour of the LSB -diffuser coupling [5,6].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Research on Flow in the Last Stage of 1090mw Steam Turbine

Hoznedl¹,

Sedlák²

2018

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The paper deals with experimental and numerical research in the last stage of real 1090MW steam turbine with the last steel blade length 1220mm placed in nuclear power station. The last stage was equipped with twelve static pressure taps. It was also possible to probe in two planes - before and behind the last stage using pneumatic or optical probes. A number of last stage flow parameters were determined at the root and tip wall for nominal turbine output. Among those parameters are static pressures, Mach and Reynolds numbers, last stage reactions and steam wetness. All the directly measured and evaluated flow parameters are taken from locally measured points and that is why even 3D CFD calculation of the whole system - last stage, diffuser and exhaust hood was implemented. Measured and calculated parameters are compared. Especially static pressures are in very good agreement; the only steam wetness has bigger difference due to different measurement position. Locally measured values are enough to estimate the flow behavior of the last stage. On the other hand, the CFD simulations with well determined boundary conditions, meshes and geometry and is effective tool to simulate even very complicated flow structures in the last stage and exhaust hood.

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Investigation of wet steam flow in a 300 MW direct air-cooling steam turbine. Part 1: Measurement principles, probe, and wetness

Cited by 23 publications

References 9 publications

An investigation of wet steam flow in a 300 MW direct air-cooling steam turbine. Part 3: Heterogeneous/homogeneous condensation

An investigation of wet steam flow in a 300 MW direct air-cooling steam turbine. Part 3: Heterogeneous/homogeneous condensation

Experimental research on the flow at the last stage of a 1090 MW steam turbine

Experimental and Numerical Research on Flow in the Last Stage of 1090mw Steam Turbine

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