JOURNAL BROWSE
Search
Advanced SearchSearch Tips
A Study on the Air Vent Valve of the Hydraulic Servo Actuator for Steam Control of Power Plants
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
A Study on the Air Vent Valve of the Hydraulic Servo Actuator for Steam Control of Power Plants
Lee, Yong Bum; Lee, Jong Jik;
  PDF(new window)
 Abstract
To produce adequate electricity in nuclear and thermal power plants, an optimal amount of steam should be supplied to a generator connected to high- and low-pressure steam turbines. A turbine output control device, which is a special steam valve employed to supply or interrupt the steam to the turbine, is operated using a hydraulic servo actuator. In power plants, the performance of servo actuators is degraded by the air generated from the hydraulic system, or causes frequent failures owing to an increase in the wear of the seal. This is due to the seal being burnt as generated heat using the produced compressed air. Some power plants have exhausted air using a fixed orifice, and thus they encounter power loss due to mass flow exhaust. Failures are generated in hydraulic pumps, electric motors, and valves, which are frequently operated. In this study, we perform modeling and analysis of the load-sensing air-exhaust valves, which can be passed through very fine flow under normal use conditions, and exhaust mass flow air at the beginning stage as with existing fixed orifices. Then, we propose a method to prevent failures due to the compressed air, and to ensure the control accuracy of hydraulic servo actuators.
 Keywords
Power Plants;Hydraulic Servo Actuator;Hydraulic Fluid;Air and Gas;Modeling and Simulation;
 Language
Korean
 Cited by
 References
1.
Lee, Y. B. and Jung, D. S., 2010, "Secure Reliability of Turbine Power Control Actuator for Power Plants," Journal of Drive and Control, Vol. 7, No. 1, pp. 22-26.

2.
Kim, H. J. and Kang, Y. H., 2002, "Service Life Analysis of Control Valve for Automatic Turbine Srartup of Thermal Power Plant," Trans. Korean Soc. Mech. Eng. A, Vol. 26, No. 1, pp. 1-6.

3.
Roh, J. H., Kim, S. H., Lee, D. I., Yang, C. K., Shin, Y. Y. and Jung, J. W., 2002, "The Development of Turbine Valve Actuator Efficiency Analysis System for the Standard Power Plants," Trans. of the KIEE, Vol. 25, No. 2, pp. 537-541.

4.
Lee, Y. B. and Yoon, Y. H., 2013, "Modeling & Simulation of a Hydraulic Servo Actuator Cushion for Power Plants," J. Korean Soc. TriboL Lubr. Eng., Vol. 29, No. 1, pp. 7-12.

5.
Lee, Y. B., 2013, "Performance Characteristics Analysis of the Hydraulic System when Hydraulic Fluid Contains a Gas," Proceedings of the KSME Annual Meeting (fall), pp. 770-772.

6.
Jang, J. and Yoon, Y., 2007, "Analysis Model Developments of Hydraulic Power Steering System," The Korean Society of Automotive Engineers, Spring Conference Proceedings, Vol. 2, pp. 674-680.

7.
SimulationX 3.6 User Manual and Library Manual, ITI GmbH, 2014.