EP0136810B1 - Temperatursteuerung während einer Glühbehandlung - Google Patents

Temperatursteuerung während einer Glühbehandlung Download PDF

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Publication number
EP0136810B1
EP0136810B1 EP84305806A EP84305806A EP0136810B1 EP 0136810 B1 EP0136810 B1 EP 0136810B1 EP 84305806 A EP84305806 A EP 84305806A EP 84305806 A EP84305806 A EP 84305806A EP 0136810 B1 EP0136810 B1 EP 0136810B1
Authority
EP
European Patent Office
Prior art keywords
tube
probe
receptor
ferritic
coil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP84305806A
Other languages
English (en)
French (fr)
Other versions
EP0136810A3 (en
EP0136810A2 (de
Inventor
Edward Duncombe
Alexander Thomson
Robert Arthur Evans
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UK Atomic Energy Authority
Original Assignee
UK Atomic Energy Authority
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by UK Atomic Energy Authority filed Critical UK Atomic Energy Authority
Publication of EP0136810A2 publication Critical patent/EP0136810A2/de
Publication of EP0136810A3 publication Critical patent/EP0136810A3/en
Application granted granted Critical
Publication of EP0136810B1 publication Critical patent/EP0136810B1/de
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00—Process control or regulation for heat treatments
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/082—Heat exchange elements made from metals or metal alloys from steel or ferrous alloys
    • F28F21/083—Heat exchange elements made from metals or metal alloys from steel or ferrous alloys from stainless steel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/04—Arrangements for sealing elements into header boxes or end plates
    • F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
    • F28F9/18—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding

Definitions

  • This invention relates to temperature control during annealing of ferromagnetic members.
  • the invention has arisen in response to problems arising in the course of annealing welds where ferritic tubes are welded to tube plates of shell and tube heat exchangers and especially heat exchangers as used in the nuclear field for steam generation such as in fast and pressurized water reactors.
  • the tubes are closely spaced and access to their welds for annealing and temperature measurement is difficult.
  • annealing tends to be carried out by an inductive probe internally of the tube in the region of the weld.
  • the probe may be in the form of an RF energised and water-cooled coil or may be as described in our copending British Application Published as GB 2130860A.
  • Anneal temperature control is performed by control of power into the probe which has been predetermined by trials on a model to obtain the required anneal. This form of control leaves uncertainties and a real time control would be preferred.
  • the present invention provides such a control.
  • a method of effecting temperature control during annealing at a joint between a ferritic tube and a tube plate or between a ferritic repair tube and a ferritic tube in a tube plate, comprising inserting an inductive heating probe inside the tube is characterised as defined in the claims.
  • the invention relies on the fact that the temperature of anneal is close to the Curie point of the material of the tube which is having its weld annealed. Thus, at above annealing temperature, there is a significant change in the permeability of the tube and hence also in the voltage induced in the receptor and this can be used to reduce power input to the probe and vice-versa. The change is so significant that the receptor can be located inside an adjacent unheated tube and, despite the fact that the unheated tube acts as a shield round the receptor, a detectable signal arises.
  • GB 360,552 shows the automatic movement of steel through a furnace when a Curie Point is reached.
  • a source of magnetic flux and means for measuring the flux are provided so that a control signal can be generated.
  • the furnace is heated conventionally.
  • GB 1,468,852 is concerned with the true detection of Curie Point in a vibrational system.
  • EP 011862A has a Curie Point monitor inserted into a heated roller to give a control signal to control resistance heat input to the roller.
  • the present invention shows a very economical use of components.
  • the receptor which may be a simple coil.
  • the act of annealing already requires an inductive heating probe and a control system for power into the probe.
  • the magnetic field which is affected by Curie change is that already provided for heating.
  • the item which has a Curie response it that being processed so that no supplementary Curie item has to be provided.
  • the invention is of particular value in the specific context of anneal in the joint repair of congested tube and plate heat exchangers.
  • FIG. 1 a tube 20 in a nest of closely spaced similar parallel tubes in a tube plate 21 is assumed leaking at the weld 22.
  • a repair tube 23 is inserted into the leaking tube 20 through the tube plate.
  • the upper end of tube 23 is explosively welded to the tube plate at a region 24 (indicated by crosses) and the lower end of tube 23 is brazed to the tube 20 at a region 25.
  • an induction heating probe 30 (see for example GB 2 130 860A) is inserted inside the tube 23.
  • This probe has a service box 32, water conducting cables 33, 34 and a handle 35.
  • the braze at region 25 is effected. After making the braze an annealing process is required. To perform this anneal the probe is retained on power but the anneal operation requires control.
  • a signal generating flux receptor coil probe 40 is inserted into a tube 20 adjacent to the tube 20 being annealed.
  • the tube 20 having the probe 40 can itself be a repaired tube (as shown) or an unrepaired tube.
  • Connections 41 are provided to the flux receptor probe 40 and these connect with a control unit 42 which controls the power input to the induction heating probe 30 along a control line 43 according to the signal generated at probe 40.
  • the link from the coil of probe 40 is preferably by optical fibre so that induced error signals do not occur in the link as may arise from the intense magnetic field which is created by the probe 30.
  • an induction heating probe 50 is shown inside a tube 51, welded at 52 to a tube plate 53.
  • the probe is located so that the weld can be annealed.
  • Around the probe 50 there is a single turn 54 of a 1 mm diameter mineral insulated conductor. This acts as a signal generating receptor and typically it provides a signal of 1.0-1.5 mV when the weld 52 is above the Curie temperature and a signal of about 0.5-0.7 mV when the weld is below the Curie temperature.
  • Figure 3 shows a circuit for use with the arrangement shown in Figure 2.
  • a 20 KHz generator 60 is used to power the heating probe 50.
  • the signal in the receptor turn 54 is backed off against an EMF derived from a current transformer 61 via a potentiometer 62. In this way the output signal from receptor 54 can be made zero prior to the Curie temperature being reached and of a magnitude to effect control at the Curie temperature.
  • the backed-off signal passes to an amplifier 63 and thence to a control unit 64 which controls output from the generator 60 to the heating probe.
  • a nest of tubes 51 is shown in sectional plan.
  • a probe 50 is located in one of these tubes.
  • a single turn receptor coil 54A is provided enclosing a number of tubes 51. As the probe is moved from one tube 51 to the next the same receptor coil 54A can be used for control purpose.
  • the receptor coil 54A encloses only a single tube 51 and is moved from tube to tube as annealing takes place.
  • each tube 51 has its own individual mineral insulated receptor coil tack welded to it as the heat exchanger is constructed and the coil terminates at a point of access remote from the tubes. In this way, later annealing can be performed without the need for access to the outside of the tubes (which may be impossible either due to the close packing of the tubes or because the tubes are radioactive).
  • a substantial signal is generated at the Curie temperature. This may typically be 1.5 volts for a single turn.
  • the invention can be used to control an anneal at the explosive weld 24 indicated in Figure 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)

Claims (7)

1. Verfahren zur Regelung der Temperatur während des Glühens einer Verbindungsstelle zwischen einem Ferritrohr und einer Rohrplatte oder zwischen einem Ferrit-Reparaturrohr und einem Ferritrohr in einer Rohrplatte, wonach eine induktive Heizsonde in das Ferritrohr oder Reparaturrohr eingeführt wird, dadurch gekennzeichnet, daß ein Signal erzeugender Rezeptor vorgesehen wird, der in einem angrenzenden Ferritrohr untergebracht ist und mit der Sonde gekoppelt ist und daß das an dem Rezeptor erzeugte Signal zur Steuerung der Energiezufuhr zur Sonde verwendet wird, wenn der Curie-Punkt in der Verbindungsstelle erreicht wird.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das angrenzende Ferritrohr nicht den Bereich des Curie-Punktes erreicht.
3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der signalerzeugende Rezeptor eine Spule ist, die eine oder mehrere Wicklungen enthält und alternativ innerhalb des Rohres untergebracht ist, an dem die Verbindung hergestellt werden soll.
4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der signalerzeugende Rezeptor alternativ aus einer Spule besteht, die ein oder mehrere Rohre umschließt, welches bzw. welche mit der Rohrplatte verbunden sind.
5. Verfahren nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, daß das Glühen an einer Explosiv-Schweißstelle durchgeführt wird, die zwischen einem Reparaturrohr und einem Rohr in einer Rohrplatte ausgebildet ist.
6. Verfahren nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, daß das Steuersignal oder Regelsignal mit Hilfe optischer Faserverbindungsvorrichtungen in Bereiche übertragen wird, in denen die genannten Verbindungen einem starken Feld von der Heizsonde ausgesetzt sind.
7. Verfahren nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, daß der Rezeptor aus einer Wicklung mit einer oder mit mehreren Windungen eines mineral-isolierten Kabels besteht, welches dauerhaft oder entfernbar der Verbindungsstelle zugeordnet ist.
EP84305806A 1983-09-07 1984-08-24 Temperatursteuerung während einer Glühbehandlung Expired EP0136810B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8323995 1983-09-07
GB08323995A GB2146435B (en) 1983-09-07 1983-09-07 Temperature control during annealing

Publications (3)

Publication Number Publication Date
EP0136810A2 EP0136810A2 (de) 1985-04-10
EP0136810A3 EP0136810A3 (en) 1986-11-26
EP0136810B1 true EP0136810B1 (de) 1989-05-24

Family

ID=10548445

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84305806A Expired EP0136810B1 (de) 1983-09-07 1984-08-24 Temperatursteuerung während einer Glühbehandlung

Country Status (3)

Country Link
EP (1) EP0136810B1 (de)
DE (2) DE136810T1 (de)
GB (1) GB2146435B (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8403157D0 (en) * 1984-02-07 1984-03-14 Atomic Energy Authority Uk Temperature control
US4816089A (en) * 1987-06-06 1989-03-28 Westinghouse Electric Corp. Process for heat treating a heat exchanger tube surrounded by a support plate
FR2769858B1 (fr) * 1997-10-21 2000-01-28 Andre Marc Joseph Spolidor Procede de traitement de la zone de transition entre les parties dudgeonnee et non dudgeonnee d'un tube, et echangeur thermique comportant application de ce procede
CN105648195B (zh) * 2016-03-08 2017-10-31 西安热工研究院有限公司 一种提高p91、p92高温管道现场焊后热处理质量的方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR487496A (fr) * 1917-06-26 1918-07-09 Lancelot William Wild Méthode pour indiquer l'état du fer, de l'acier ou d'autres métaux magnétisables, pendant leur traitement par la chaleur
FR620345A (fr) * 1925-12-23 1927-04-20 Const Metallurg Soc Et Procédé et dispositif de traitement thermique, applicables aux corps magnétiques
GB360552A (en) * 1929-09-03 1931-11-12 Hevi Duty Electric Co Improvements relating to the heat treatment of magnetizable metal
DE866655C (de) * 1950-10-29 1953-02-12 Basf Ag Nachbehandlung von seitlichen, angeschweissten Rohranschluessen bei Mehrlagenhohlkoerpern
FR2235372B1 (de) * 1973-06-29 1978-12-29 Siderurgie Fse Inst Rech
EP0011862A1 (de) * 1978-12-04 1980-06-11 General Electric Company Heizfixiervorrichtung mit kontaktlosem Temperaturfühler
CA1184099A (en) * 1980-07-07 1985-03-19 Charles F. Cravens Method of heat treating metal

Also Published As

Publication number Publication date
DE3478312D1 (en) 1989-06-29
DE136810T1 (de) 1985-08-14
GB8323995D0 (en) 1983-10-12
GB2146435A (en) 1985-04-17
EP0136810A3 (en) 1986-11-26
EP0136810A2 (de) 1985-04-10
GB2146435B (en) 1987-02-18

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