Heat exchanger life extension via in-situ reconditioning

Holcomb, David E.; Muralidharan, Govindarajan

Title: Heat exchanger life extension via in-situ reconditioning

Patent · Tue Jun 28 00:00:00 EDT 2016

OSTI ID:1259496

Holcomb, David E.; Muralidharan, Govindarajan

A method of in-situ reconditioning a heat exchanger includes the steps of: providing an in-service heat exchanger comprising a precipitate-strengthened alloy wherein at least one mechanical property of the heat exchanger is degraded by coarsening of the precipitate, the in-service heat exchanger containing a molten salt working heat exchange fluid; deactivating the heat exchanger from service in-situ; in a solution-annealing step, in-situ heating the heat exchanger and molten salt working heat exchange fluid contained therein to a temperature and for a time period sufficient to dissolve the coarsened precipitate; in a quenching step, flowing the molten salt working heat-exchange fluid through the heat exchanger in-situ to cool the alloy and retain a supersaturated solid solution while preventing formation of large precipitates; and in an aging step, further varying the temperature of the flowing molten salt working heat-exchange fluid to re-precipitate the dissolved precipitate.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-00OR22725

Assignee:: UT-Battelle, LLC (Oak Ridge, TN)

Patent Number(s):: 9,377,245

Application Number:: 13/833,357

OSTI ID:: 1259496

Resource Relation:: Patent File Date: 2013 Mar 15

Country of Publication:: United States

Language:: English

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