Method for determining the distance between two points in a rotating air preheater and a rotary air preheater

摘要

The rotary air preheater 10 includes a housing 12 having a rotor 14. The rotor 14 has opposite ends 20 and 24 and is divided into a plurality of sections 46 by a plurality of partition plates 48. The plurality of sector plates 28 include one sector plate 28 which is hermetically sealed relative to one of opposite ends 20 and 24 of the rotor 14. The air preheater 10 includes a flange 56 and a detector 49 attached to at least one of the plurality of sector plates 28. The detecting device 49 detects the distance between the sector plate 28 and the flange 56. The detector 49 includes a conduit 54 for directing the compressed air jet to the flange 56, a first pressure sensor 60, and a second pressure sensor 70. The first pressure sensor 60 detects the pressure inside the detector 49 and the second pressure sensor 70 detects the pressure outside the detector 49. The distance between the sector plate 28 and the flange 56 isThe pressure difference measured by the second pressure sensor 70. In one embodiment, the first pressure sensor 60 detects the back pressure within the detector 49.