| 摘要 |
A spiral heat exchanger is disclosed for indirect heat transfer between fluid media, primarily in heat recovery applications characterized by undissolved materials suspended in one or both fluid media. The heat exchanger has a transition chamber between the inlet for a fouling fluid (one which carries undissolved materials) and a heat exchanging passage for the fouling fluid. The transition chamber is has an enlarged cross section compared to the fouling fluid passage to collect undissolved material that may otherwise flow into the fouling fluid passage. This arrangement allows undissolved material to collect without completely blocking the fouling fluid passage. Easy access is provided to the transition chamber to remove collected undissolved material. A heat-conducting strip spirally wound within a shell or casing with opposite edges of the strip sealed to the casing defines two adjacent, spirally extending fluid passages. The strip is supported and sealed at opposite edges thereof without obstructing at least the fouling fluid passage. The seal may be accomplished by a sealant applied in liquid form which then hardens or cures. The heat exchanger is supported by a rigid support element or stanchion to which the strip is affixed and which extends as a mounting from the coiled strip so that the coiled strip may be supported thereby. Fluid inlet and outlet ports may also be affixed to and supported by the support element.
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