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首页> 外文会议>HydroVision 2008 conference technical papers >SILT EROSION IN INDIAN HYDROELECTRIC PROJECTS - LABORATORY STUDIES OF THERMAL SPRAY COATINGS OVER HYDRO TURBINE COMPONENTS
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SILT EROSION IN INDIAN HYDROELECTRIC PROJECTS - LABORATORY STUDIES OF THERMAL SPRAY COATINGS OVER HYDRO TURBINE COMPONENTS

机译：印度水电项目中的土壤侵蚀-水轮机部件上热喷涂层的实验室研究

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摘要

Silt erosion damage in under water parts of hydro electric projects and minimisation ofrnthese problems (generally termed as ‘Silt Menace') have been constantly engaging thernattention of hydro engineers and manufacturers of hydro power plant equipment worldrnwide. The Indian sub-continent is one of the most vulnerable zones in the world for siltrnerosion and sedimentation. The rivers of most of the power plants in northern India,rnChina, Bhutan and Nepal originate in the Himalayan region which has relatively weakrnand fragile geology. During the monsoon days of April-September, the streams carryrnhuge silt load, predominantly comprising of quartz particles, which are very hard inrnnature and irregular in shape. This heavily silt laden water containing up to 15,000 ppmrnsilt or even more during rainy season, find entry into the water conductor system andrnimpinges on the surface of the turbine, underwater components such as runnerrnassembly, guide vanes, labyrinth sealing rings and surface liners of turbine top coverrnand bottom ring causing severe metal loss due to erosion.rnHydro turbine components are manufactured from 13%Cr-4%Ni stainless steel. Thernerosion due to silt is so rapid that within one year of operation for 4000-5000 hours, thernworn out components need extensive repairs by way of rebuilding by welding followedrnby thermal spray metallic coatings or by polymeric coatings. The various generationrnutilities in the central and state sectors have been incurring huge expenditure in India forrnthe reconstruction of the damaged parts.rnInvestigations made by conducting experimental studies of silt laden water erosion ofrn13/4 stainless steel, over laid as well as subjected to thermal spray by Plasma, HVOF,rnD-Gun coatings are presented in this paper. The silt characteristics of Indian rivers arernalso discussed. The studies presented here were conducted under actual hydraulicrnconditions simulated in a unique "Silt-Water Impingement Erosion Test Rig". In thisrnunique test rig which has been indigenously designed and developed and happens tornbe the only one such rig in India, the conditions encountered in hydro turbines can bernsimulated by varying and controlling the various operating parameters. Details ofrnextensive experimental investigations carried out in this test rig are reported andrndiscussed in this paper.
机译：水力发电项目水下部分的淤泥侵蚀破坏以及这些问题的减少（通常称为“淤泥威胁”）一直是全球水力工程师和水力发电设备制造商的关注焦点。印度次大陆是世界上最重要的粉刺和沉积区之一。印度北部，中国，不丹和尼泊尔的大多数发电厂的河流都起源于喜马拉雅地区，该地区地质相对脆弱。在四月至九月的季风期间，溪流承载着巨大的淤泥负荷，主要由石英颗粒组成，这些石英颗粒的性质非常坚硬，形状不规则。这种富含泥沙的水在雨季含有高达15,000 ppm的淤泥，甚至更多，会发现进入水导体系统和涡轮表面上的波纹管，水下组件（例如流道组件，导流叶片，迷宫式密封环和涡轮顶部的表面衬里）的进入盖和底环会因腐蚀而造成严重的金属损失。rn水轮机部件由13％Cr-4％Ni不锈钢制成。由于淤泥而引起的侵蚀非常迅速，以致于在运行4000-5000小时后的一年内，磨损的部件需要通过焊接，热喷涂金属涂层或聚合物涂层的重建来进行广泛的维修。在印度，中央和国有部门的各种公用事业部门都在花费巨额资金来修复受损零件。rn通过对rn13 / 4不锈钢的淤泥水侵蚀进行实验研究，进行了研究，并对其进行了热喷涂。本文介绍了等离子，HVOF，rnD-Gun涂层。还讨论了印度河流的淤积特征。这里介绍的研究是在独特的“淤泥水冲蚀试验台”中模拟的实际水力条件下进行的。在这种由印度人自行设计和开发的碰巧试验台上，碰巧是印度唯一的这种试验台，可以通过改变和控制各种运行参数来模拟水轮机遇到的情况。本文报道并讨论了在该试验台上进行的广泛实验研究的细节。

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  • 来源
  • 会议地点 Sacramento CA(US)
  • 作者

    M.K. Sharma; G.S. Grewal; A.K. Singh;

  • 作者单位

    Electrical Research Development Association (ERDA), ERDA Road, GIDC, Makarpura, Vadodara-390 010 (India), Ph.: 091-265-3048028, Fax.: 091-265-2638382, E-mail: mtd@erda.org;

    Electrical Research Development Association (ERDA), ERDA Road, GIDC, Makarpura, Vadodara-390 010 (India);

    Electrical Research Development Association (ERDA), ERDA Road, GIDC, Makarpura, Vadodara-390 010 (India);

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 水力发电;水能利用、水电站工程;
  • 关键词

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