Development of the water-lubricated thrust bearing of the hydraulic turbine generator

Inoue, Kosuke; Deguchi, Kisaburo; Okude, Kunio; Fujimoto, R.

doi:10.1088/1755-1315/15/7/072022

Cited by 11 publications

(8 citation statements)

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“…Oil-free applications in Hydro are becoming very important and distinctive with regard to the sustainability of the plants. Among the applications relating to lubrication in the Hydro sector, one of the most critical is related to the hubs of Kaplan rotors [51]. Although the quantities of oil are not significant, the criticality is very high due to the contact with the water flow.…”

Section: Resultsmentioning

confidence: 99%

Hydropower Case Study Collection: Innovative Low Head and Ecologically Improved Turbines, Hydropower in Existing Infrastructures, Hydropeaking Reduction, Digitalization and Governing Systems

Quaranta

Bonjean²,

Cuvato³

et al. 2020

Sustainability

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Hydropower remains a key renewable energy source in the pursuit of the decarbonization of the economy, although the relatively high potential impact of the hydro-morphological alterations it may cause poses significant concerns for aquatic ecosystems. In the last years, new technologies and practices have been increasingly adopted to minimize the impacts of hydropower plants, while improving efficiency and flexibility of energy generation. The overall effect of these innovations may be a more sustainable design and operation of hydropower, striking a better balance between the objectives of decarbonization and ecosystem protection. This contribution presents and discusses a few representative examples of hydropower installations from companies in Italy, France, Switzerland, Belgium and the USA, where solutions have been adopted in this direction. The case studies cover (1) ecologically improved and low head hydropower converters (Vortex turbine, Hydrostatic Pressure Machine, VLH and Girard-optimized turbines, hydrokinetic turbines), hydropeaking reduction (2) new control systems, governors and digitalization, (3) hydropower as a strategy for local sustainable development and (4) energy recovery in existing hydraulic infrastructures and aqueducts. It was found that better-governing systems can extend the life span of runners, for example avoiding the runner uplift during a trip. Digitalization can improve efficiency by 1.2%. New sustainable practices and turbines with better ecological behavior can minimize environmental impacts, like the reduction of fish mortality, improvement of fish habitat availability, reduction of oil for lubrication purposes and generation of economic incomes for local development. The use of existing structures reduces the total installation cost: examples are the total saving of 277 €/kW by reusing irrigation pipes and reservoirs, or the reduction of the investment period from 9 years to 6 years by turbining the environmental flow. Innovative low head hydropower converters can exhibit good ecological behavior, with reduced costs (<5000 €/kW) especially when installed in existing weirs. Results are discussed, contextualized and generalized to provide engineering data and tools to support future realizations of similar case studies; normalized costs, efficiency improvement, best practices and new technologies are discussed.

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Section: Resultsmentioning

confidence: 99%

Hydropower Case Study Collection: Innovative Low Head and Ecologically Improved Turbines, Hydropower in Existing Infrastructures, Hydropeaking Reduction, Digitalization and Governing Systems

Quaranta

Bonjean²,

Cuvato³

et al. 2020

Sustainability

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“…| https://mc03.manuscriptcentral.com/friction morphology of the thrust ring with aluminum bronze/Throden SXL friction pairs [86] and compared the wear results with stainless steel/PEEK friction pairs [209], which concluded that harder frictional subsets could increase the loading capacity of thrust bearings and reduce wear. Therefore, six sets of friction pairs with different hardness combinations as shown in Table 7 were tested and the results indicated that the increasing hardness of thrust rings would reduce the production possibility of abrasive particles and improve wear resistance [207].…”

Section: Frictionmentioning

confidence: 99%

Review of the evolution and prevention of friction, wear, and noise for water-lubricated bearings used in ships

et al. 2023

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With the development of green tribology in the shipping industry, the application of water lubrication gradually replaces oil lubrication in stern bearings and thrust bearings. In terms of large-scale and high-speed ships, water-lubricated bearings with high performance are more strictly required. However, due to the lubricating medium, water-lubricated bearings have many problems such as friction, wear, vibration, noise, etc. This review focuses on the performance of marine water-lubricated bearings and their failure prevention mechanism. Furthermore, the research of marine water-lubricated bearings is reviewed by discussing its lubrication principle, test technology, friction and wear mechanism, and friction noise generation mechanism. The performance enhancement methods have been overviewed from structure optimization and material modification. Finally, the potential problems and the perspective of water-lubricated bearings are given in detail.

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“…The safety, stability, cleanliness and low-carbon of hydropower and pumped storage units are of great significance to the sustainable development of energy [1], and in the context of the goal of "carbon peaking and carbon neutral", the water conservancy and hydropower industry has ushered in another development peak [2]. At present, large, medium and small vertical hydropower units and pumped storage units in the world have different degrees of oil dumping and oil mist overflow in the bearing oil tank [3][4]. The traditional bearing oil tank sealing method is generally deficient, and the problem of oil dumping and oil spillage has been a long-standing problem in the industry, which has restricted the further development of hydropower and pumped storage units.…”

Section: Introductionmentioning

confidence: 99%

Investigation into the Evolution of Unsteady Flow of Lubricating Oil System in Guide Bearing of a Pump Turbine Unit

Zhang¹,

Meng²,

Zhang

et al. 2022

J. Phys.: Conf. Ser.

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The water-guide bearing lubricating oil system of pumped storage unit is prone to oil dumping and oil spillage during the start-up of the unit, which seriously threatens the safe and stable operation of the unit. In this study, a three-dimensional unsteady numerical simulation is performed to investigate the causes of oil dumping and oil spillage of a water-guide bearing lubricating oil system of a pumped storage power plant unit based on the VOF (volume of fluid) multiphase flow model and Realizable k-ε model. The unsteady flow characteristics inside the rotating oil basin and pump-type Pitot tube during the start-up process are analyzed. The results demonstrate that the change of the external characteristics of the lubricating oil system can be divided into two stages, the initial formation process of the lubricating oil flow and the stable circulation process of the lubricating oil flow. In the initial formation process, the pressure inside the rotating basin is uniformly distributed in the circumferential direction, and a high-pressure zone is generated near the inlet of the pump-type Pitot tube, driving the lubricant flow to the stationary basin above; in the stable flow cycle process, the internal lubricant flow velocity gradually decreases along the radius direction, and a large vortex zone appears behind the pump-type Pitot tube and at the inlet of it. This phenomenon leads to the lubricating oil pressure here to be lower than the saturation vaporization pressure, which may trigger lubricating oil atomization and then overflow from the seal ring. This study is committed to provide theoretical analysis and engineering reference for the investigation of the causes of oil dumping and oil spillage in the lube oil system of water guide bearings of pumped storage units.

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Development of the water-lubricated thrust bearing of the hydraulic turbine generator

Cited by 11 publications

References 0 publications

Hydropower Case Study Collection: Innovative Low Head and Ecologically Improved Turbines, Hydropower in Existing Infrastructures, Hydropeaking Reduction, Digitalization and Governing Systems

Hydropower Case Study Collection: Innovative Low Head and Ecologically Improved Turbines, Hydropower in Existing Infrastructures, Hydropeaking Reduction, Digitalization and Governing Systems

Review of the evolution and prevention of friction, wear, and noise for water-lubricated bearings used in ships

Investigation into the Evolution of Unsteady Flow of Lubricating Oil System in Guide Bearing of a Pump Turbine Unit

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