Patent ID: 6598664
Filing Date: 2003-07-29
Classification: F28D,Y10S

Abstract:
A rotary regenerative air preheater having a cold end and an oppositely disposed hot end and comprising:a substantially circular housing having a radially inner surface; a heat exchange rotor rotatably mounted within the housing having axially spaced first and second end portions and a radially outer surface, the first and second end portions of the rotor each having a circumferential sealing surface, the radially outer surface of the rotor and the radially inner surface of the housing defining a gap; and first and second circumferential bypass seal rings disposed within the gap and sealingly engaging the sealing surface of the first and second end portions of the rotor, respectively, each of the bypass seal rings comprising a plurality of bypass seals, each of the bypass seals including longitudinally extending primary and secondary seal leaves, each of the seal leaves having oppositely disposed first and second ends and first and second end portions, the primary seal leaf of each bypass seal being mounted to the corresponding secondary seal leaf at only a single longitudinal position intermediate the first and second ends of the primary and secondary seal leaves, the first end portion of the primary seal leaf extending longitudinally beyond the first end of the secondary seal leaf and the second end portion of the secondary seal leaf extending longitudinally beyond the second end of the primary seal leaf, wherein the first end portion of the primary seal leaf of each bypass seal in each of the seal rings overlaps the second end portion of the secondary seal leaf of an adjacent bypass seal in the seal ring.