DE2509230A1 - Multiwall flexible pipe for feeding oxygen to blast furnaces - has hole in inner flexible pipe to prevent pressure surges - Google Patents

Multiwall flexible pipe for feeding oxygen to blast furnaces - has hole in inner flexible pipe to prevent pressure surges

Info

Publication number
DE2509230A1
DE2509230A1 DE19752509230 DE2509230A DE2509230A1 DE 2509230 A1 DE2509230 A1 DE 2509230A1 DE 19752509230 DE19752509230 DE 19752509230 DE 2509230 A DE2509230 A DE 2509230A DE 2509230 A1 DE2509230 A1 DE 2509230A1
Authority
DE
Germany
Prior art keywords
flexible pipe
pipe
pressure
hole
blast furnaces
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.)
Granted
Application number
DE19752509230
Other languages
German (de)
Other versions
DE2509230B2 (en
DE2509230C3 (en
Inventor
Harry L Van Moppes
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.)
ANACONDA BV
Original Assignee
ANACONDA BV
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 ANACONDA BV filed Critical ANACONDA BV
Priority to DE19752509230 priority Critical patent/DE2509230C3/en
Priority claimed from DE19752509230 external-priority patent/DE2509230C3/en
Publication of DE2509230A1 publication Critical patent/DE2509230A1/en
Publication of DE2509230B2 publication Critical patent/DE2509230B2/en
Application granted granted Critical
Publication of DE2509230C3 publication Critical patent/DE2509230C3/en
Expired legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B7/00Blast furnaces
    • C21B7/16Tuyéres
    • C21B7/163Blowpipe assembly

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

Flexible pipe made of special steel and employed for feeding oxygen to a blast furnace, using an external casing of pressure-resistant plaited wire covering a sealed corrugated pipe which surrounds an aerodynamically smooth flexible pipe, viz. an Aglaf pipe, and with couplings on both ends of the pipe. Specifically the aerodynamically smooth flexible pipe is made of red brass (6-15% Zn) and contains >=1 pressure-relief ring provided with a hole, and a bent guide plate is fitted in the ring, leaving a gas between the hole and the guide plate. When the oxygen supply is switched off, a rapid build up of pressure can occur in the flexible pipe and this pressure surge can destroy the pipe. The pressure-relief ring prevents the surge.

Description

SAUERSTOFF-ZUFUH1tUNGSSC}ILAUCIT FUR HOCHOFEN Die Erfindung geht aus von einem Sauerstoff-Zuführungsschlauch aus Edelstahl für Hochöfen, mit einem äußeren druckfesten Drahtgeflecht, darunter einem abdichtenden Wellrohr und einem inneren aerodynamisch glatten , aus einem Mäanderprofil gewickelten sogenannten Aglafschlauch, sowie mit stirnseitigen Anschlußarmaturen. OXYGEN-ZUFUH1tUNGSSC} ILAUCIT FOR HOCHFEN The invention works from a stainless steel oxygen supply hose for blast furnaces, with a outer pressure-resistant wire mesh, including a sealing corrugated pipe and a inner aerodynamically smooth so-called wound from a meander profile Aglaf hose, as well as with connection fittings on the front.

Einen solchen Schlauch von bekannter Ausführung zeigt Figur 1. Wegen der auftretenden ungewöhnlichen mechanischer und thermischen Beanspruchungen besteht er durchweg aus Edelstahl. Durch solche Schläuche wird Sauerstoff mit einem Druck von etwa 20 at und einer Geschwindigkeit von über 4o in/sec. geblasen, der Verunreinigungen enthalten kann.Such a hose of known design is shown in FIG. 1 the unusual mechanical and thermal stresses that occur all made of stainless steel. Through such hoses, oxygen is released at a pressure of about 20 at and a speed of over 4o in / sec. blown out of impurities may contain.

Zur Vttrmeidung von Inkrustationen und Wirbelverlusten ist der irmere aerodynamisch glatte Aglafschlauch eingelegt, umgeben von dem abdichtenden Wellrohr, und auf diesem wiederum sitzt die gegen den Überdruck abstützende Geflechthülle.To avoid incrustations and eddy losses, the irmere aerodynamically smooth Aglaf hose inserted, surrounded by the sealing corrugated pipe, and on this in turn, the one that supports against the overpressure sits Braided cover.

Im Hochofenbetrieb kommt es vor, daß das Sauerstoff-Zuführungsventil an der Einlaßseite eines solchen Schlauches rasch abgesperrt werden muß. Dabei baut sich der Überdruck im Aglafschlauch sehr viel schneller ab als der Überdruck des Sauerstoffpolsters zwischen dem wie eine Labyrintdichtung wirkenden Aglafschlauch und dem nach außen abgedichteten Wellrohr.In blast furnace operation it happens that the oxygen supply valve must be shut off quickly at the inlet side of such a hose. It builds the overpressure in the Aglaf hose is reduced much faster than the overpressure in the Oxygen cushion between the Aglaf hose, which acts like a labyrinth seal and the corrugated pipe sealed to the outside.

Der nun stoßweise auftretenden einseitigen Druckbelastung ist der Aglafschlauch nicht gewachsen. Er wird nach innen gebeult, und es kann zu bleibenden Deformationen kommen, welche bis zur Unbrauchbarkeit eines solchen sehr teueren Sauerstoff-Zuführungsschlauches führen können.The now intermittent unilateral pressure load is the Aglaf's tube not grown. It becomes dented inwards and it can become permanent Deformations occur, which are very expensive to the point of being unusable Oxygen supply hose can lead.

Um diesen Mangel bei einem Sauerstoff-Zuführungsschlauch der eingangs erwähnten Gattung zu beseitigen, wird erfindungsgemäß vorgeschlagen, daß in den Aglafschlauch wenigstens ein Entlüftungsring eingeschleift ist, an dessen zulaufseitigem Rand ein gekröpftes Führungsblech fest ist, mit Abstand unter einer Bohrung des Entlüftungsringes verlaufend.To address this deficiency in the case of an oxygen supply hose, see the introduction To eliminate mentioned genus, the invention proposes that in the Aglafschlauch is looped in at least one ventilation ring, on the inlet side Edge a cranked guide plate is fixed, with a gap under a hole of the Vent ring running.

An seinem ablaufseitigen frei auskragenden Rand bildet das Abdeckblech eine Strahlpumpe. Während der betrieblichen Durchströmung des eo Agl af wird fortwährend über die Bohrung im Entlüftungsring Sauerstoff abgezogen, der in den Ringraum zwischen Aglafschlauch und Wellrohr einsickerte. Dadurch wird der Überdruck in diesem Ringraum verringert. Der restliche, schon nicht mehr besonders gefährliche Überdruck kann sich durch die Bohrung im Entlüftungsring rasch abbauen, auch wenn einlaßseitig das Schieberventil aus betrieblichen Gründen plötzlich geschlossen werden sollte.The cover plate forms a jet pump at its freely cantilevered edge on the outlet side. During the operational flow of the eo Agl af Oxygen is continuously withdrawn through the hole in the ventilation ring, which seeped into the annular space between the Aglaf hose and the corrugated pipe. This reduces the overpressure in this annulus. The remaining overpressure, which is no longer particularly dangerous, can quickly be reduced through the hole in the ventilation ring, even if the slide valve on the inlet side should suddenly be closed for operational reasons.

Die Erfindung möge anhand des in Figur 2 an einem Schlauchstück im Axialriß schematisch dargestellten Ausführungsbeispiels weiter erläutert werden.The invention may be based on the in Figure 2 on a piece of tubing in Axialriß schematically illustrated embodiment will be further explained.

Im druckfesten Drahtgeflecht 2 ist das dichtende Wellrohr 1 abgestützt, und unter diesem sitzt der aerodynamisch glatte Aglafschlauch 3. Etwa in der Mitte des Schlauches ist dieser unterbrochen durch den eingeschleiften Entlüftungsring 4, der eine Bohrung 6 aufweist. Diese ist mit Abstand überdeckt von einem gekröpften Führungsblech 3, das mit seiner Kröpfung am zulaufseitigen Rand des Entlüftungsringes 4 fest ist. Alle Teile bestehen aus Edelstahl. Alle Verbindungen sind geschweißt.The sealing corrugated pipe 1 is supported in the pressure-resistant wire mesh 2, and under this sits the aerodynamically smooth Aglaf hose 3. Approximately in the middle of the hose, this is interrupted by the looped-in ventilation ring 4, which has a bore 6. This is covered by a cranked one at a distance Guide plate 3, with its crank on the inlet edge of the ventilation ring 4 is fixed. All parts are made of stainless steel. All connections are welded.

In Weiterbildung der Erfindung könnte der Differenzdruck beiderseits deslAglafschlauches nach außen angezapft und verwendet werden zur manometrischen Liefermengenmessung.In a further development of the invention, the differential pressure could be on both sides The sleep tube can be tapped to the outside and used for manometric Delivery quantity measurement.

Ein Entlüftungsring 4 kann mehrere Bohrungen 6 nebst abdeckenden Führungsblechen 5 aufweisen. In längeren Schläuchen sind mehrere Entlüftungsringe vorzusehen, mit bis zu 6 Meter gegenseitigem Abstand, entsprechend der Fördergeschwindigkeit des Sauerstoffes.A ventilation ring 4 can have several bores 6 together with covering guide plates 5 have. Several ventilation rings are to be provided in longer hoses, with up to 6 meters of mutual distance, according to the conveyor speed of the Oxygen.

Claims (1)

ANSPRUCH CLAIM Sauerstoff-Zuführungsschlauch aus Edelstahl für Hochöfen mit einem äußeren druckfesten Drahtgeflecht, darunter einem abdichtenden Wellrohr und einem inneren aerodynamisch glatten Aglaf -Tbikschlauch,
sowie mit stirnseitigen Anschlußarmaturen, dadurch gekennzeichnet, daß in den Tombakschlauch (1) wenigstens ein Entlüftungsring (4) eingeschleift ist, an dessen zulaufseitigem Rand ein gekröpftes Führungsblech (5) fest ist, mit Abstand unter einer Bohrung(6)des Entlüftungsrohres (4) verlaufend.
Oxygen supply hose made of stainless steel for blast furnaces with an outer pressure-resistant wire mesh, underneath a sealing corrugated pipe and an inner aerodynamically smooth Aglaf -Tbike tube,
as well as with connection fittings on the face side, characterized in that at least one ventilation ring (4) is looped into the tombac hose (1), on the inlet-side edge of which a cranked guide plate (5) is fixed, at a distance below a bore (6) of the ventilation pipe (4) running.
L e e r s e i t eL e r s e i t e
DE19752509230 1975-03-04 Oxygen supply hose for blast furnaces Expired DE2509230C3 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19752509230 DE2509230C3 (en) 1975-03-04 Oxygen supply hose for blast furnaces

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19752509230 DE2509230C3 (en) 1975-03-04 Oxygen supply hose for blast furnaces

Publications (3)

Publication Number Publication Date
DE2509230A1 true DE2509230A1 (en) 1976-09-23
DE2509230B2 DE2509230B2 (en) 1977-07-14
DE2509230C3 DE2509230C3 (en) 1978-02-23

Family

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4581041A (en) * 1985-01-10 1986-04-08 Combustion Engineering, Inc. Mount for the fuel nozzle of a gasifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4581041A (en) * 1985-01-10 1986-04-08 Combustion Engineering, Inc. Mount for the fuel nozzle of a gasifier

Also Published As

Publication number Publication date
DE2509230B2 (en) 1977-07-14

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8328 Change in the person/name/address of the agent

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8339 Ceased/non-payment of the annual fee