Degradation of Phosphate Ester Hydraulic Fluid in Power Station Turbines Investigated by a Three-Magnet Unilateral Magnet ArrayReportar como inadecuado




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1

State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China

2

MRI Centre, Department of Physics, P.O. Box 4400, University of New Brunswick, Fredericton, NB E3B 5A3, Canada

3

Centre of Medical Biophysics, Universidad de Oriente, Patricio Lumumba S-N, Santiago de Cuba 90500, Cuba





*

Author to whom correspondence should be addressed.



Abstract A three-magnet array unilateral NMR sensor with a homogeneous sensitive spot was employed for assessing aging of the turbine oils used in two different power stations. The Carr-Purcell-Meiboom-Gill CPMG sequence and Inversion Recovery-prepared CPMG were employed for measuring the 1H-NMR transverse and longitudinal relaxation times of turbine oils with different service status. Two signal components with different lifetimes were obtained by processing the transverse relaxation curves with a numeric program based on the Inverse Laplace Transformation. The long lifetime components of the transverse relaxation time T2eff and longitudinal relaxation time T1 were chosen to monitor the hydraulic fluid aging. The results demonstrate that an increase of the service time of the turbine oils clearly results in a decrease of T2eff,long and T1,long. This indicates that the T2eff,long and T1,long relaxation times, obtained from the unilateral magnetic resonance measurements, can be applied as indices for degradation of the hydraulic fluid in power station turbines. View Full-Text

Keywords: three-magnet array; unilateral magnetic resonance; turbine oils; power station; aging accessment; T2eff,long; T1,long; rejection standard three-magnet array; unilateral magnetic resonance; turbine oils; power station; aging accessment; T2eff,long; T1,long; rejection standard





Autor: Pan Guo 1,2,* , Wei He 1 and Juan C. García-Naranjo 2,3

Fuente: http://mdpi.com/



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