US3705057A - Method for treating heat exchangers and similar apparatus in thermal power plants - Google Patents

Method for treating heat exchangers and similar apparatus in thermal power plants Download PDF

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Publication number
US3705057A
US3705057A US151261A US3705057DA US3705057A US 3705057 A US3705057 A US 3705057A US 151261 A US151261 A US 151261A US 3705057D A US3705057D A US 3705057DA US 3705057 A US3705057 A US 3705057A
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United States
Prior art keywords
heat exchangers
thermal power
power plants
pressure
protective
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Expired - Lifetime
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US151261A
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English (en)
Inventor
Fritz Kelp
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Kraftwerk Union AG
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Kraftwerk Union AG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings

Definitions

  • a method of treating heat exchangers and like apparatus used in thermal power plants for applying a protective magnetite layer to the surface of iron or steel tubes or other wall portions of the heat exchanger has the steps of subjecting the surface to a flow of steam at a temperature above 220 C. in the absence of air and simultaneously, during the time the protective layer is applied, subjecting the tube to a pressure differential corresponding approximately to the pressure differential to which the tube is subjected in actual use.
  • My invention relates to a method for treating heat exchangers and similar apparatus used in thermal power plants. It is desirable to produce magnetite protective layers on the surfaces of heat exchanger tubes or other wall portions made of steel, for the purpose of preventing damage due to corrosion. Such protective layers can be applied on iron or steel surfaces with the aid of steam, without admitting air and at temperatures above 220' C., according to the reaction:
  • the wall portions to be treated for production of protective layers are subjected to difference pressures which correspond approximately to the pressure values that occur during operation.
  • the steam pressure may be adjusted so that it is close to the operating pressure of the subsequent working medium.
  • the vapor pressure during the production of protective layers may amount inside the tubes, to about to of the pressure difference which occurs during subsequent operation, while the pressure outside the tubes corresponds approximately to atmospheric pressure.
  • a difference pressure of 23 kp./cm. prevails during operation.
  • the protective layer is produced at a vapor pressure inside the tubes 1 of 20 kp./cm. and at an atmospheric pressure in the region 2 surrounding the tubes, the protective layer will have been formed at conditions which are somewhat below the conditions encountered in later operation with respect to expansions. During subsequent operation this leads to a slight tensile stress and, when the exchanger is shut down there is a compressive stress in the magnetite protective layer. Both stresses may be withstood without fissures developing so that the magnetite layer can maintain its protective function during at all occurring pressures.
  • the total range to be bridged depends upon how the tubular wall thickness is dimensioned.
  • the invention makes it possible, however to cover pressure ranges which without entailing a danger of damage, are at least three times as high as those of the methods used heretofore.
  • Method of treating heat exchangers and like apparatus used in thermal power plans for applying a protective magnetite layer to the surface of iron or steel tubes or other wall portions of heat exchangers comprising the steps of subjecting said surface to a fiow of steam at a temperature above 220 C. in the absence of air and simultaneously, during the time the protective layer is applied, subjecting said tube to a pressure differential corresponding approximately to the pressure differential to which said tube is subjected in actual use.
  • Method of applying a layer of protective magnetite to the surface of iron or steel tubes or other wall portions of heat exchangers and like apparatus for use in thermal power plants comprising the steps of applying a protective layer of magnetite to said surface while, simultaneously, subjecting said surface to a flow of steam at a temperature above 220 C. in the ab- References Cited UNITED STATES PATENTS 2,399,758 5/1946 Pierri 1486.35 X

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatment Of Articles (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
US151261A 1970-06-13 1971-06-09 Method for treating heat exchangers and similar apparatus in thermal power plants Expired - Lifetime US3705057A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702029249 DE2029249A1 (de) 1970-06-13 1970-06-13 Verfahren zur Behandlung von Warme tauschern und ähnlichen Apparaten in Warmekraftw erken

Publications (1)

Publication Number Publication Date
US3705057A true US3705057A (en) 1972-12-05

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ID=5773883

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US151261A Expired - Lifetime US3705057A (en) 1970-06-13 1971-06-09 Method for treating heat exchangers and similar apparatus in thermal power plants

Country Status (5)

Country Link
US (1) US3705057A (de)
AT (1) AT300493B (de)
CH (1) CH564609A5 (de)
DE (1) DE2029249A1 (de)
ZA (1) ZA713797B (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3969153A (en) * 1974-01-18 1976-07-13 Hitachi, Ltd. Method of manufacturing a stainless steel boiler tube with anticorrosive coating
US3990862A (en) * 1975-01-31 1976-11-09 The Gates Rubber Company Liquid heat exchanger interface and method
US4082575A (en) * 1976-04-21 1978-04-04 Thermacore, Inc. Production of liquid compatible metals
US4082140A (en) * 1972-11-14 1978-04-04 Austral-Erwin Engineering Company Heat exchange method
US4127164A (en) * 1972-11-14 1978-11-28 Austral-Erwin Engineering Co. Heat exchange apparatus
US5786296A (en) * 1994-11-09 1998-07-28 American Scientific Materials Technologies L.P. Thin-walled, monolithic iron oxide structures made from steels
US6051203A (en) * 1996-04-30 2000-04-18 American Scientific Materials Technologies, L.P. Thin-walled monolithic metal oxide structures made from metals, and methods for manufacturing such structures
US6461562B1 (en) 1999-02-17 2002-10-08 American Scientific Materials Technologies, Lp Methods of making sintered metal oxide articles

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3145236C2 (de) * 1981-11-13 1984-11-22 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8000 München Verfahren zur Herstellung von verformungsbeständigen oxydischen Schutzschichten

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4082140A (en) * 1972-11-14 1978-04-04 Austral-Erwin Engineering Company Heat exchange method
US4127164A (en) * 1972-11-14 1978-11-28 Austral-Erwin Engineering Co. Heat exchange apparatus
US3969153A (en) * 1974-01-18 1976-07-13 Hitachi, Ltd. Method of manufacturing a stainless steel boiler tube with anticorrosive coating
US3990862A (en) * 1975-01-31 1976-11-09 The Gates Rubber Company Liquid heat exchanger interface and method
US4093755A (en) * 1975-01-31 1978-06-06 The Gates Rubber Company Method for making a liquid heat exchanger coating
US4082575A (en) * 1976-04-21 1978-04-04 Thermacore, Inc. Production of liquid compatible metals
US5786296A (en) * 1994-11-09 1998-07-28 American Scientific Materials Technologies L.P. Thin-walled, monolithic iron oxide structures made from steels
US5814164A (en) * 1994-11-09 1998-09-29 American Scientific Materials Technologies L.P. Thin-walled, monolithic iron oxide structures made from steels, and methods for manufacturing such structures
US6051203A (en) * 1996-04-30 2000-04-18 American Scientific Materials Technologies, L.P. Thin-walled monolithic metal oxide structures made from metals, and methods for manufacturing such structures
US6071590A (en) * 1996-04-30 2000-06-06 American Scientific Materials Technologies, L.P. Thin-walled monolithic metal oxide structures made from metals, and methods for manufacturing such structures
US6077370A (en) * 1996-04-30 2000-06-20 American Scientific Materials Technologies, L.P. Thin-walled monolithic metal oxide structures made from metals, and methods for manufacturing such structures
US6461562B1 (en) 1999-02-17 2002-10-08 American Scientific Materials Technologies, Lp Methods of making sintered metal oxide articles

Also Published As

Publication number Publication date
CH564609A5 (de) 1975-07-31
DE2029249A1 (de) 1971-12-23
AT300493B (de) 1972-07-25
ZA713797B (en) 1972-01-26

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