Experimental assessment of droplet impact erosion resistance of steam turbine blade materials

Ahmad, Majd; Casey, Michael; Sürken, Norbert

doi:10.1016/j.wear.2009.06.012

Cited by 109 publications

(61 citation statements)

References 15 publications

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“…Some research works have been performed on the influence of micro-droplets on wet steam erosion, Ahmad et al (2009).…”

Section: Condensation In Turbine Stagesmentioning

confidence: 99%

Mechanisms of Water Droplets Deposition on Turbine Blade Surfaces and Erosion Wear Effects

Ilieva¹

2017

JAFM

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Failure of turbine blades leads to various exploitation problems, efficiency decrease and economical losses, at all. A detailed research on aerodynamic features, in various exploitation conditions and regimes, and on reasons for failures, is a prerequisite to the obviated technical problems and increased reliability of turbine aggregates. Water droplets erosion is known as a very complex and crucial phenomena. It couples the effects of wet steam expansion, together with condensation (evaporation), presence of second phase with the impact of water droplets over blade surfaces, erosion effects and fatigue mechanisms. The present research deals with a logical sequence for numerical simulations and research on erosion mechanisms in a low pressure stage of К-1000-6 /1500 steam turbine, working at a Nuclear Power Plant. Attention is paid to the impact of droplets' diameter on blade surfaces, their aerodynamic behavior and efficiency of energy conversion through turbine channels. Particular trajectories of water droplets, reasons for occurrence of erosion wear, over certain parts of the streamlined surfaces, are established and discussed. An approach to acquire incidence time to erosion appearance is implemented. Research methodology and obtained results are applicable to determine erosion effects on streamed complex surfaces, to replace expensive measurements campaigns, introduce approaches to decrease wetness in last stages of condensation turbines and prolong the reliability of blades operated in wet steam conditions

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“…Some research works have been performed on the influence of micro-droplets on wet steam erosion, Ahmad et al (2009).…”

Section: Condensation In Turbine Stagesmentioning

confidence: 99%

Mechanisms of Water Droplets Deposition on Turbine Blade Surfaces and Erosion Wear Effects

Ilieva¹

2017

JAFM

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“…When steam expands in turbines, water droplets appear, which cause a decrease of turbine efficiencies (e.g., Leyzerovich, 2005) and premature turbine blade erosion (e.g., Ahmad et al, 2009). As recalled in DiPippo (2013), this problem is more frequent in geothermal or nuclear power plants because the steam entering turbines is typically saturated (i.e., not superheated).…”

Section: Liquid Content At Turbines Outletmentioning

confidence: 99%

“…furthermore, water droplets may appear during steam expansion, which reduces the turbine overall efficiency (e.g., Leyzerovich, 2005) and increases the blade erosion rate (e.g., Ahmad et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Improvement of Double-Flash geothermal power plant design: A comparison of six interstage heating processes

Sarr

Mathieu-Potvin

2015

Geothermics

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In this paper, six different modifications of the Double-Flash power plants are proposed. These modifications are named "interstage heating" and consist of additional heat exchangers properly located in the system. The six interstage heating designs are analysed, optimized and then compared to an optimized Double-Flash reference power plant. The objective function is the power plant specific output (kJ/kg), and the design variables are the separator temperatures (°C) and the split fraction. Optimizations are performed for a wide range of reservoir temperatures (i.e., from 140 °C to 240 °C). Results show that interstage heating processes may increase the specific output of the plant by about 5%, decrease the liquid content in the low pressure turbine by about 50%, and decrease the required cooling capacity of the plant by about 10%. On the other hand, the analysis showed that the new designs proposed have negligible influence on the high pressure turbine liquid content or on the silica saturation coefficient. Keywords

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“…More recent methods focused on hybrid utilization scenarios which make it possible to superheat geothermal steam with heat sources like solar or fossil fuels (Zhou 2014), (Bidini et al 1998). Superheating of geothermal steam is more interesting because in addition to higher power output, increasing saturated steam temperature reduces the probability of water droplet formation in the last stages of turbine expansion process, which also would reduce turbine failure possibility due to corrosion and erosion (Ahmad et al 2009). In this regard, Potvin proposed a new simple method for superheating geothermal steam in both single and double flash cycle using heat contained in hot wellhead fluid.…”

Section: Introductionmentioning

confidence: 99%

Energetic and exergetic Improvement of geothermal single flash cycle

Nazari

Porkhial

2016

Int. J. Renew. Energy Dev.

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This paper presents a detailed analysis of a new method for improving energetic and exergetic efficiencies of single flash cycle. The thermodynamic process of the new method consists of extracting a fraction of hot wellhead geothermal brine for the purpose of superheating saturated steam entering the turbine. Computer programming scripts were developed and optimized based on mathematical proposed models for the different components of the systems. The operating parameters such as separator temperature, geofluid wellhead enthalpy and geothermal source temperature are varied to investigate their effects on both net power output and turbine exhaust quality of the systems. Also, full exergy assessment was performed for the new design. The results of separator temperature optimization revealed that specific net power output of the new design can be boosted up to 8% and turbine exhaust quality can be diminished up to 50% as compared to common single flash cycle. In addition, for wells with higher discharge enthalpy, superheating process improve specific net power output even up to 10%. Finally, it was observed that the overall system exergy efficiency was approximately raised 3%. Article History: Received January 5th 2016; Received in revised form June 25th 2016; Accepted July 3rd 2016; Available onlineHow to Cite This Article: Nazari, N. and Porkhial, S. (2016). Energetic and Exergetic Improvement of Geothermal Single Flash Cycle. Int. Journal of Renewable Energy Development, 5(2),129-138.http://dx.doi.org/10.14710/ijred.5.2.129-138

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Experimental assessment of droplet impact erosion resistance of steam turbine blade materials

Cited by 109 publications

References 15 publications

Mechanisms of Water Droplets Deposition on Turbine Blade Surfaces and Erosion Wear Effects

Mechanisms of Water Droplets Deposition on Turbine Blade Surfaces and Erosion Wear Effects

Improvement of Double-Flash geothermal power plant design: A comparison of six interstage heating processes

Energetic and exergetic Improvement of geothermal single flash cycle

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