MANAGING THE RISKS OF ADVERSE OPERATIONAL REQUIREMENTS IN POWER GENERATION - CASE STUDY IN GAS AND HYDRO TURBINES
Load demands in power generation for the national or district grid often require turbo-generator sets to operate under adverse operational requirements with respect to maintenance and design ideals. Such instances typically involve turbines operating beyond maintenance schedules and/or at part load conditions. Part load operations for hydro turbines in particular have its own unique problems. Power generation managers have to manage the risks of machine damage imposed onto their engineering assets in attempts to ensure continuing and stable electricity dispatch. This paper presents two case studies examining the risks of machine failures from adverse operating requirements and how it could be managed by condition monitoring. One involved gas turbines operating beyond OEM recommended operating hours between maintenance. Blades failures are potential concerns. The risks were evaluated and managed with vibration monitoring of the blades passing frequencies. The other case study relates to hydro-turbines operating in rough zones at part load conditions dictated by load stabilization requirements of the electricity grid. Measurements of vibrations, draft tube pressures and strain gauging showed distressed conditions when the turbines were operated at part loads. Premature failures were experienced in these units.
Blade vibrations Flow induced vibrations Spectral analysis
M Salman Leong Ng BH
Institute of Noise & Vibration, Universiti Teknologi Malaysia, Jalan Semarak, Kuala Lumpur, Malaysia Tenaga Nasional Berhad, Connaught Bridge Power Station, Klang, Malaysia
国际会议
北京
英文
866-873
2008-10-27（万方平台首次上网日期，不代表论文的发表时间）