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RISS 인기검색어
- 검색키워드
- 저자 : Aslam Noon, A. (검색결과 3 건)
- 무료
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Erosion wear on Francis turbine components due to sediment flow
Aslam Noon, A.,Kim, M.H. Elsevier Sequoia [etc.] 2017 Wear: An international journal on the science and Vol.378 No.-
<P>Sediment particles flowing through the turbine components erode the surface in interaction. Erosive wear of hydro turbine components generally depends on different parameters such as concentration, size and shape of the sediments particle, velocity of flow, properties of the base material of the turbine components and operating hours of the turbine. Tarbela Dam Hydel Project (TDHP) located in the Himalayan range in Pakistan is facing the same problem. The sediments particle have caused damage to the plant equipment, mainly to the turbine components; stay vanes, guide vanes, runner and draft tube. As a result, these components are disassembled and refurbished almost every year. Analysis have been performed on one of the Francis turbine units to predict the effect of sediment particles concentration, size and shape on erosion rate. Gradual removal of the base material has changed the profiles of various components of the turbine and also has weaken its structure. One of the major concerns of these effects is the continuous loss of turbine hydraulic efficiency. The governing equations of fluid flow are solved numerically on an unstructured grid using FEM based software ANSYS CFX. Finnie erosion model is used to compute average erosion rates. Simulation results are compared with the actual site data. The CFD analysis showed good agreement with the results of experimental work done previously using similar kind of geometries and operating conditions. (C) 2017 Elsevier B.V. All rights reserved.</P>
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Qyyum, Muhammad Abdul,Wei, Feng,Hussain, Arif,Noon, Adnan Aslam,Lee, Moonyong Elsevier 2018 Applied thermal engineering Vol.144 No.-
<P><B>Abstract</B></P> <P>Liquefied natural gas (LNG) has attracted global attention as a more ecological energy source when compared to other fossil fuels. The nitrogen (N<SUB>2</SUB>) expander liquefaction is the most green and safe process among the different types of commercial natural gas liquefaction processes, but its relatively low energy efficiency is a major issue. To solve this issue, an energy-efficient, safe, and simple refrigeration cycle was proposed to improve the energy efficiency of the N<SUB>2</SUB> based natural-gas liquefaction process. In the proposed refrigeration cycle, vortex tube as an expansion device was integrated with turbo-expander in order to reduce the overall required energy for LNG production. A well-known commercial simulator Aspen Hysys® v9 was employed for modeling and analysis of proposed LNG process. The hybrid vortex-tube turbo-expander LNG process resulted in the specific energy requirement of 0.5900 kWh/kg LNG. Furthermore, the energy efficiency of the proposed LNG process was also compared with previous N<SUB>2</SUB> expander-based LNG processes. The results demonstrated that the proposed hybrid configuration saved up to 68.5% (depending on feed composition and conditions) in terms of the overall specific energy requirement in comparison with previous studies.</P> <P><B>Highlights</B></P> <P> <UL> <LI> An innovative vortex tube based N<SUB>2</SUB> expansion refrigeration cycle. </LI> <LI> Vortex tube is hybridized with turbo-expander for LNG production. </LI> <LI> The overall energy requirement for the LNG process is reduced significantly. </LI> <LI> The proposed refrigeration cycle can be implemented to other cryogenic processes. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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