| 摘要 |
A sealing system for heat exchangers of the type having a plurality of vertically positioned heat tubes extending through a heat tube sheet for exchanging heat between the interior of the plurality of heat tubes to the surrounding atmosphere, the sealing system including a first outer ring having a wall portion, terminating in an upper face, and defining an annular space between the lower end portion of the outer ring and the heat tube and tube sheet; a high nickel metal inner ring, positioned within the annular space surrounding the heat tube and resting on the tube sheet; a soft metal casing partially housing the high nickel inner ring so that when force is applied downward on the first outer ring, the annular space is reduced sufficiently to force the high nickel ring and the soft metal casing into a sealing relationship between the heat tube and the tube sheet, while allowing for vertical movement of the heat tube; the outer ring further defining a means to prevent the high nickel ring and the soft metal casing to be crushed by the downwardly applied force; and a pressure collar surrounding the sealing system for applying the force to effect the seal between the heat tube and tube sheet. There is further provided a secondary seal of packing material positioned between the first outer ring and the wall of the heat tube.
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