Global to push GA events into
skip to main content

Title: Heat exchanger life extension via in-situ reconditioning

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.
Inventors:
;
Issue Date:
OSTI Identifier:
1259496
Assignee:
UT-Battelle, LLC (Oak Ridge, TN) ORNL
Patent Number(s):
9,377,245
Application Number:
13/833,357
Contract Number:
AC05-00OR22725
Resource Relation:
Patent File Date: 2013 Mar 15
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
24 POWER TRANSMISSION AND DISTRIBUTION; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 36 MATERIALS SCIENCE

Other works cited in this record:

Microstructural and microchemical mechanisms controlling intergranular stress corrosion cracking in light-water-reactor systems
journal, October 1994

Steam Generator for Advanced Ultra Supercritical Power Plants 700C to 760C
conference, January 2011

Nickel-base heat resistant and wear resistant alloy
patent, November 1975

Process for the improvement of refractory composite materials comprising a matrix consisting of a superalloy and reinforcing fibers consisting of a metal carbide
patent, October 1976

Forgeable nickel-base super alloy
patent, March 1980

Oxidation-resistant nickel alloy
patent, October 1984

Precipitation-hardening nickel-base alloy and method of producing same
patent, March 1987

Nickel-base alloys for high-temperature forging dies usable in atmosphere
patent, April 1988

Nickel-chromium alloy of improved fatigue strength
patent, August 1988

Process for thermally stress-relieving a tube
patent, April 1989

Heat resistant alloys
patent, December 1991

Nickel aluminide base single crystal alloys
patent, December 1992

Heat treatment of Alloy 718 for improved stress corrosion cracking resistance
patent, September 1993

High temperature creep and oxidation resistant chromium silicide matrix alloy containing molybdenum
patent, July 1994

Alloy based on a silicide containing at least chromium and molybdenum
patent, February 1998

Nickel-cobalt based alloys
patent, March 1999

Surface treatment of austenitic Ni-Fe-Cr-based alloys for improved resistance to intergranular-corrosion and-cracking
patent, February 2002

Surface treatment of austenitic Ni-Fe-Cr based alloys for improved resistance to intergranular corrosion and intergranular cracking
patent, August 2003

Nickel-based alloy for high-temperature technology
patent, September 2004

Nickel-base superalloy composition and its use in single-crystal articles
patent, June 2005

Nickel base superalloys and turbine components fabricated therefrom
patent, June 2005

Superalloy for single crystal turbine vanes
patent, March 2006

Nickel-based alloys and articles made therefrom
patent, November 2010

Superalloy compositions, articles, and methods of manufacture
patent, April 2012

Austenitic heat resistant alloy
patent, November 2012

Similar records in DOepatents and OSTI.GOV collections: