Abstract
Lubrication oil, which is supplied to rotating elements in gas turbines of combined-cycle power generation, is used to maintain the efficiency of electricity production. The gas turbines are exposed to high-temperature environment due to the thermal energy obtained from fossil fuel, which degrades the performance of the lubricating oil. A system for controlling the temperature of the oil is essential, but there are a few problems in the case of the temperature control valve in the system, such as the hunting phenomenon, with which the target mass flow rate cannot be achieved, fatigue fracture and leakage. In this study, finite element analysis was performed to overcome these issues. The hunting phenomenon was prevented by redesigning the orifice shape of the valve cage. The fatigue fracture and self-loosening of the clamp bolt were overcome by changing the bolt size and tightening torque. In addition, a proper O-ring was selected to prevent leakage. The performance of a prototype was also tested to verify the reliability of the finite element analysis.
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More From: International Journal of Precision Engineering and Manufacturing
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