'A SENSING DEVICE FOR LEAKAGE CONTROL SYSTEM OF ROTARY REGENERATIVE AIR PRE-HEATER TO MAINTAIN OPTIMAL GAP SECTOR PLATE OF THE PRE-HEATER AND RADIAL SEALS OF THE ROTOR'

摘要

The invention relates to an RF Admittance based rotor position sensing device for leakage control system in Rotary Regenerative Air preheaters, comprising two conductive rectangular plates, one of which is stationary and mounted on the sector plate and a second passive which is fixed on the rotor periphery wherein an RF signal input is fed to the static sensor plate and RF admittance is measured in terms of variation of the signal strength, and wherein the pattern of variation is used to assess the leakage gap between the sector plate and the radial seals.