EP0290813B1 - Heat exchanger, especially for cooling cracked gases - Google Patents

Heat exchanger, especially for cooling cracked gases Download PDF

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Publication number
EP0290813B1
EP0290813B1 EP88106024A EP88106024A EP0290813B1 EP 0290813 B1 EP0290813 B1 EP 0290813B1 EP 88106024 A EP88106024 A EP 88106024A EP 88106024 A EP88106024 A EP 88106024A EP 0290813 B1 EP0290813 B1 EP 0290813B1
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EP
European Patent Office
Prior art keywords
tube
cooling
heat exchanger
gas
sleeve
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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 - Lifetime
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EP88106024A
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German (de)
French (fr)
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EP0290813A1 (en
Inventor
Peter Brücher
Helmut Lachmann
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Deutsche Babcock Borsig AG
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Deutsche Babcock Borsig 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
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/22—Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
    • 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
    • F28F9/0229—Double end plates; Single end plates with hollow spaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0075—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for syngas or cracked gas cooling systems
    • 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
    • F28F9/22—Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
    • F28F2009/222—Particular guide plates, baffles or deflectors, e.g. having particular orientation relative to an elongated casing or conduit
    • F28F2009/226—Transversal partitions

Definitions

  • the invention relates to a heat exchanger, in particular for cooling cracked gases according to the preamble of claims 1 and 2.
  • the fission gases formed by thermal cracking of hydrocarbons are cooled very quickly to stabilize their molecular composition. This is done by indirect heat transfer from the cracked gas to the heat-absorbing medium in cracked gas coolers.
  • the cracked gas is passed through pipes which are surrounded by evaporating water as a cooling medium.
  • the evaporating water provides intensive cooling of the pipes, which means that the wall temperature is relatively low and is only slightly above the temperature of the evaporating water.
  • the cracked gas is a mixture of hydrocarbons of different molecular weights and partial pressures.
  • the condensation temperature can be fallen below for some of the components. As a result, these components are precipitated on the pipe wall in the area of low temperatures and a so-called coke layer is built up.
  • This coke layer increases the flow resistance, which increases the gas pressure in the upstream cracking furnace. This results in poorer fission gas yield, a further increase in the coke layer, rising gas outlet temperature and lower steam generation. After a certain operating time, the cracked gas cooler must be taken out of operation to remove the coke layer.
  • a heat exchanger is known from US Pat. No. 3,547,188, the tubes of which are surrounded by a cladding tube over almost the entire length. The entire flow of the heat exchange medium is conducted through the annular spaces thus formed. It is ensured that a turbulent flow occurs in the annular spaces in order to achieve good heat transfer on the pipe surface.
  • the invention has for its object to design the generic heat exchanger such that the cooling effect at the outlet end of the gas-carrying pipes is reduced to the extent that the risk of the formation of a coke layer is largely avoided.
  • the wetting of the rear pipe end with cooling medium is reduced. This makes the cooling effect less intense, so that the temperature on the inner wall of the gas-carrying pipe is above the condensation temperature of the cracked gas components.
  • the heat exchanger shown is of a standing type and is used in particular for cooling cracked gas with the help of evaporating water under excess pressure. It consists of a tube bundle composed of individual tubes 1, through which the gas to be cooled flows and which are surrounded by a jacket 2. The tubes 1 are held in two tube plates 3, 4, to which a gas inlet chamber 5 and a gas outlet chamber 6 are connected.
  • the thin tube plate 3 on the gas inlet side is on the Supported gas inlet chamber 5 side supported by a support plate 7 which is arranged to form a space 8 at a distance from the thin tube plate 3. Between the thin tube plate 3 and the support plate 7, support fingers 9 are provided distributed over the cross section and are molded onto the support plate 7.
  • the tubes 1 each penetrate loosely through the support plate 7, forming an annular gap.
  • the thin tube plate 3 is connected to an outer ring jacket 10 and the support plate 7 is connected to an inner ring jacket 11.
  • the ring jackets 10, 11 are connected to one another and delimit an annular chamber 12 into which an inlet connection 13 for the supply of the water serving as a cooling medium.
  • the upper part of the jacket 2 is provided with an outlet connection 14 for the removal of the cooling medium.
  • the sleeve consists of a sleeve tube 15 which is open on both sides and which surrounds the tube 1 at a distance, forming an annular gap.
  • the sleeve tube 15 is supported on the tube 1 via cams 16.
  • the sleeve tubes 15 are held in locking washers 17, which are arranged within the jacket 2 perpendicular to the axis thereof and which are intended to prevent the tubes 1 from vibrating.
  • the length of the sleeve tube 15 is adapted to the operating requirements and ends shortly before the tube plate 4 lying on the gas outlet side.
  • the width of the annular gap between the tube 1 and the sleeve tube 15 is dimensioned so large that the boiling water present in the interior of the jacket 1 is prevented from flowing into the annular gap in an amount sufficient for complete wetting.
  • the resulting reduced or prevented wetting of the tube 1 with boiling water causes a reduced heat transfer from the heat-emitting to the heat-absorbing medium and thereby the desired less intensive cooling.
  • This less intensive cooling causes a higher pipe wall temperature, which means that no or fewer hydrocarbons condense. The result is that coke formation is prevented or at least reduced.
  • the reduction in the cooling effect can be influenced by changing the gap width. Furthermore, openings 18 can be provided in the wall of the sleeve tube 15, through which boiling water can penetrate into the annular gap and thus increase the cooling effect again.
  • the invention can be used both in shell-and-tube heat exchangers (FIGS. 1 and 2) and in double-tube heat exchangers.
  • a section of such a double tube heat exchanger is shown in FIG. 3.
  • each gas-carrying pipe 1 is surrounded by an outer pipe 19 to form an annular space.
  • the annular space is connected to an inlet and an outlet chamber 20, which is common to a number of double pipes.
  • a gas-carrying pipe 1 facing the outlet chamber 20 can, as described, be enclosed by a sleeve tube 15 which ends shortly before the outlet chamber 20 or protrudes a little into it.
  • 3 shows a different type of sheathing of the gas-carrying pipe 1, which can optionally also be used in the shell-and-tube heat exchanger according to FIGS. 1 and 2.
  • This sheath consists of a wire mesh 21, which is drawn like a sock over the tube 1.
  • the wire mesh 21 reduces wetting of the gas-carrying pipe 1 on the endangered pipe length in the same way as the sleeve pipe 15.

Description

Die Erfindung betrifft einen Wärmetauscher, insbesondere zum Kühlen von Spaltgasen nach dem Oberbegriff der Ansprüches 1 und 2.The invention relates to a heat exchanger, in particular for cooling cracked gases according to the preamble of claims 1 and 2.

Die durch eine thermische Spaltung von Kohlenwasserstoffen gebildeten Spaltgase werden zur Stabilisierung ihrer molekularen Zusammensetzung sehr schnell gekühlt. Dies erfolgt durch eine indirekte Wärmeübertragung von dem Spaltgas an das wärmeaufnehmende Medium in Spaltgaskühlern. Das Spaltgas wird durch Rohre geführt, die von verdampfendem Wasser als Kühlmedium umgeben sind. Durch das verdampfende Wasser wird eine intensive Kühlung der Rohre erzielt, wodurch die Wandtemperatur relativ niedrig ist und nur wenig über der Temperatur des verdampfenden Wassers liegt. Das Spaltgas ist ein Gemisch von Kohlenwasserstoffen unterschiedlichen Molekulargewichts und Partialdrucks. Während der Abkühlung im Spaltgaskühler kann für einige der Komponenten die Kondensationstemperatur unterschritten werden. Als Folge davon kommt es im Bereich der niedrigen Temperaturen zur Ausscheidung dieser Komponenten an der Rohrwandung und damit zum Aufbau einer sogenannten Koksschicht. Diese Koksschicht erhöht den Strömungswiderstand, wodurch sich der Gasdruck im vorgeschalteten Spaltofen erhöht. Schlechtere Spaltgasausbeute, weitere Erhöhung der Koksschicht, steigende Gasaustrittstemperatur und geringere Dampferzeugung sind die Folge. Nach einer gewissen Betriebszeit muß der Spaltgaskühler zur Beseitigung der Koksschicht außer Betrieb genommen werden.The fission gases formed by thermal cracking of hydrocarbons are cooled very quickly to stabilize their molecular composition. This is done by indirect heat transfer from the cracked gas to the heat-absorbing medium in cracked gas coolers. The cracked gas is passed through pipes which are surrounded by evaporating water as a cooling medium. The evaporating water provides intensive cooling of the pipes, which means that the wall temperature is relatively low and is only slightly above the temperature of the evaporating water. The cracked gas is a mixture of hydrocarbons of different molecular weights and partial pressures. During cooling in the cracked gas cooler, the condensation temperature can be fallen below for some of the components. As a result, these components are precipitated on the pipe wall in the area of low temperatures and a so-called coke layer is built up. This coke layer increases the flow resistance, which increases the gas pressure in the upstream cracking furnace. This results in poorer fission gas yield, a further increase in the coke layer, rising gas outlet temperature and lower steam generation. After a certain operating time, the cracked gas cooler must be taken out of operation to remove the coke layer.

Bei einem aus der US-A-38 02 497 bekannten Wärmetauscher zur Kühlung von Spaltgas und anderen Gasen ist zur Verminderung der Bildung der Koksschicht das austrittsseitige Ende der gasführenden Rohre von einem Außenrohr umgeben, das zur Atmosphäre hin offen ist. Auf diese Weise bildet sich eine Schicht ruhender Luft zwischen dem gasführenden Rohr und dem Außenrohr aus. Die Anordnung eines solchen Doppelrohres verhindert die Wärmeabgabe so stark, daß die Kühlung der Spaltgase unzureichend wird.In a heat exchanger known from US-A-38 02 497 for cooling cracked gas and other gases, the outlet-side end of the gas-carrying pipes is surrounded by an outer pipe which is open to the atmosphere in order to reduce the formation of the coke layer. In this way, a layer of still air forms between the gas-carrying pipe and the outer pipe. The arrangement of such a double tube prevents the heat emission so much that the cooling of the cracked gases is insufficient.

Aus der US-A-3 547 188 ist ein Wärmetauscher bekannt, dessen Rohre nahezu auf der gesamten Länge von einem Hüllrohr umgeben sind. Durch die so gebildeten Ringräume wird der gesamte Strom des Wärmeaustauschmediums geführt. Dabei ist dafür gesorgt, daß sich in den Ringräumen eine turbulente Strömung einstellt, um einen guten Wärmeübergang an der Rohroberfläche zu erzielen.A heat exchanger is known from US Pat. No. 3,547,188, the tubes of which are surrounded by a cladding tube over almost the entire length. The entire flow of the heat exchange medium is conducted through the annular spaces thus formed. It is ensured that a turbulent flow occurs in the annular spaces in order to achieve good heat transfer on the pipe surface.

Der Erfindung liegt die Aufgabe zugrunde, den gattungsgemäßen Wärmetauscher derart zugestalten, daß die Kühlwirkung am austrittsseitigen Ende der gasführenden Rohre gerade soweit vermindert wird, daß die Gefahr der Bildung einer Koksschicht weitgehend vermieden wird.The invention has for its object to design the generic heat exchanger such that the cooling effect at the outlet end of the gas-carrying pipes is reduced to the extent that the risk of the formation of a coke layer is largely avoided.

Diese Aufgabe wird bei einem gattungsgemäßen Wärmetauscher durch die kennzeichnenden Merkmale der Ansprüche 1 oder 2 gelöst. Eine vor­teilhafte Ausgestaltung der Erfindung ist in den Anspruch 3 angege­ben.This object is achieved in a generic heat exchanger by the characterizing features of claims 1 or 2. An advantageous embodiment of the invention is specified in claim 3.

Bei dem erfindungsgemäßen Wärmetauscher wird die Benetzung des hinteren Rohrendes mit Kühlmedium vermindert. Dadurch wird die Kühlwirkung weniger intensiv, so daß die Temperatur an der Innenwand des gasführenden Rohres oberhalb der Kondensationstemperatur der Spaltgaskomponenten liegt. Durch eine Veränderung der Spaltbreite zwischen dem gasführenden Rohr und dem umgebenden Hülsenrohr sowie durch eine Änderung der Dicke oder Dichte des Drahtgeflechtes kann der Grad der Kühlung verändert und so der Wärmetauscher den Betriebsanforderungen angepaßt werden.In the heat exchanger according to the invention, the wetting of the rear pipe end with cooling medium is reduced. This makes the cooling effect less intense, so that the temperature on the inner wall of the gas-carrying pipe is above the condensation temperature of the cracked gas components. By changing the gap width between the gas-carrying pipe and the surrounding sleeve pipe and by changing the thickness or density of the wire mesh, the degree of cooling can be changed and the heat exchanger can thus be adapted to the operating requirements.

Mehrere Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden im folgenden näher erläutert. Es zeigen:

  • Fig. 1 einen Längsschnitt durch einen Wärmetauscher gemäß der Erfindung,
  • Fig. 2 die Einzelheit Z nach Fig. 1 und
  • Fig. 3 die Einzelheit Z gemäß einer anderen Ausführungsform.
Several embodiments of the invention are shown in the drawing and are explained in more detail below. Show it:
  • 1 shows a longitudinal section through a heat exchanger according to the invention,
  • Fig. 2 shows the detail Z of FIG. 1 and
  • Fig. 3 shows the detail Z according to another embodiment.

Der dargestellte Wärmetauscher ist von stehender Bauart und dient insbesondere zum Kühlen von Spaltgas mit Hilfe von verdampfendem, unter Überdruck stehendem Wasser. Er besteht aus einem Rohrbündel aus einzelnen Rohren 1, die von dem zu kühlenden Gas durchströmt und von einem Mantel 2 umgeben sind. Die Rohre 1 sind in zwei Rohrplatten 3, 4 gehalten, an die sich eine Gaseintrittskammer 5 und eine Gasaustrittskammer 6 anschließen.The heat exchanger shown is of a standing type and is used in particular for cooling cracked gas with the help of evaporating water under excess pressure. It consists of a tube bundle composed of individual tubes 1, through which the gas to be cooled flows and which are surrounded by a jacket 2. The tubes 1 are held in two tube plates 3, 4, to which a gas inlet chamber 5 and a gas outlet chamber 6 are connected.

Die dünne Rohrplatte 3 auf der Gaseintrittsseite ist auf der der Gaseintrittskammer 5 abgewandten Seite durch eine Tragplatte 7 abgestützt, die unter Bildung eines Zwischenraumes 8 mit Abstand von der dünnen Rohrplatte 3 angeordnet ist. Zwischen der dünnen Rohrplatte 3 und der Tragplatte 7 sind über den Querschnitt verteilt Tragfinger 9 vorgesehen, die an die Tragplatte 7 angeformt sind. Die Rohre 1 durchdringen jeweils unter Bildung eines Ringspaltes lose die Tragplatte 7. Die dünne Rohrplatte 3 ist mit einem äußeren Ringmantel 10 und die Tragplatte 7 mit einem inneren Ringmantel 11 verbunden. Die Ringmäntel 10, 11 sind miteinander verbunden und umgrenzen eine Ringkammer 12, in die ein Eintrittsstutzen 13 für die Zuführung des als Kühlmedium dienenden Wassers. Der obere Teil des Mantels 2 ist mit einem Austrittsstutzen 14 für die Abführung des Kühlmediums versehen.The thin tube plate 3 on the gas inlet side is on the Supported gas inlet chamber 5 side supported by a support plate 7 which is arranged to form a space 8 at a distance from the thin tube plate 3. Between the thin tube plate 3 and the support plate 7, support fingers 9 are provided distributed over the cross section and are molded onto the support plate 7. The tubes 1 each penetrate loosely through the support plate 7, forming an annular gap. The thin tube plate 3 is connected to an outer ring jacket 10 and the support plate 7 is connected to an inner ring jacket 11. The ring jackets 10, 11 are connected to one another and delimit an annular chamber 12 into which an inlet connection 13 for the supply of the water serving as a cooling medium. The upper part of the jacket 2 is provided with an outlet connection 14 for the removal of the cooling medium.

Das der Gasaustrittskammer 6 zugewandte Ende der Rohre 1 ist von einer Hülse umschlossen. Die Hülse besteht nach den Fig. 1 und 2 aus einem beidseitig offenen Hülsenrohr 15, das das Rohr 1 unter Bildung eines Ringspaltes mit Abstand umgibt. Zur Einhaltung der Spaltbreite ist das Hülsenrohr 15 über Nocken 16 auf dem Rohr 1 abgestützt. Die Hülsenrohre 15 sind in Sicherungsscheiben 17 gehalten, die innerhalb des Mantels 2 senkrecht zu dessen Achse angeordnet sind und die ein Schwingen der Rohre 1 verhindern sollen. Die Länge des Hülsenrohres 15 ist den Betriebsanforderungen angepaßt und endet kurz vor der auf der Gasaustrittsseite liegenden Rohrplatte 4.The end of the tubes 1 facing the gas outlet chamber 6 is enclosed by a sleeve. 1 and 2, the sleeve consists of a sleeve tube 15 which is open on both sides and which surrounds the tube 1 at a distance, forming an annular gap. To maintain the gap width, the sleeve tube 15 is supported on the tube 1 via cams 16. The sleeve tubes 15 are held in locking washers 17, which are arranged within the jacket 2 perpendicular to the axis thereof and which are intended to prevent the tubes 1 from vibrating. The length of the sleeve tube 15 is adapted to the operating requirements and ends shortly before the tube plate 4 lying on the gas outlet side.

Die Breite des Ringspaltes zwischen dem Rohr 1 und dem Hülsenrohr 15 ist so groß bemessen, daß das in dem Innenraum des Mantels 1 vorhandene siedende Wasser gehindert wird, in einer für die vollständige Benetzung ausreichenden Menge in den Ringspalt zu strömen. Die dadurch reduzierte oder unterbundene Benetzung des Rohres 1 mit siedendem Wasser bewirkt einen verminderten Wärmeübergang von dem wärmeabgebenden zu dem wärmeaufnehmenden Medium und dadurch die gewünschte weniger intensive Kühlung. Diese weniger intensive Kühlung bewirkt eine höhere Rohrwandtemperatur, wodurch keine oder weniger Kohlenwasserstoffe kondensieren. Das Resultat ist, daß die Koksbildung verhindert oder zumindest vermindert wird.The width of the annular gap between the tube 1 and the sleeve tube 15 is dimensioned so large that the boiling water present in the interior of the jacket 1 is prevented from flowing into the annular gap in an amount sufficient for complete wetting. The resulting reduced or prevented wetting of the tube 1 with boiling water causes a reduced heat transfer from the heat-emitting to the heat-absorbing medium and thereby the desired less intensive cooling. This less intensive cooling causes a higher pipe wall temperature, which means that no or fewer hydrocarbons condense. The result is that coke formation is prevented or at least reduced.

Die Verminderung der Kühlwirkung kann durch eine Veränderung der Spaltbreite beeinflußt werden. Ferner können in der Wandung des Hülsenrohres 15 Durchbrechungen 18 vorgesehen werden, durch die siedendes Wasser in den Ringspalt eindringen und so die Kühlwirkung wieder verstärken kann.The reduction in the cooling effect can be influenced by changing the gap width. Furthermore, openings 18 can be provided in the wall of the sleeve tube 15, through which boiling water can penetrate into the annular gap and thus increase the cooling effect again.

Die Erfindung kann sowohl bei Bündelrohrwärmetauschern (Fig. 1 und 2) als auch bei Doppelrohrwärmetauschern eingesetzt werden. Ein Ausschnitt aus einem solchen Doppelrohrwärmetauscher ist in der Fig. 3 dargestellt. Bei diesem Wärmetauscher ist jedes gasführende Rohr 1 unter Bildung eines Ringraumes von einem Außenrohr 19 umgeben. Der Ringraum ist an eine Eintritts- und eine Austrittskammer 20 angeschlossen, die einer Anzahl von Doppelrohren gemeinsam ist.The invention can be used both in shell-and-tube heat exchangers (FIGS. 1 and 2) and in double-tube heat exchangers. A section of such a double tube heat exchanger is shown in FIG. 3. In this heat exchanger, each gas-carrying pipe 1 is surrounded by an outer pipe 19 to form an annular space. The annular space is connected to an inlet and an outlet chamber 20, which is common to a number of double pipes.

Das der Austrittskammer 20 zugewandte Ende eines gasführenden Rohres 1 kann wie beschrieben, von einem Hülsenrohr 15 umschlossen sein, das kurz vor der Austrittskammer 20 endet oder ein Stück in diese hinein­ragt. In der Fig. 3 ist eine andere Art der Umhüllung des gasführenden Rohres 1 dargestellt, die wahlweise auch bei dem Bündelrohrwärmetauscher gemäß den Fig. 1 und 2 eingesetzt werden kann. Diese Umhüllung besteht aus einem Drahtgeflecht 21, das strumpfartig über das Rohr 1 gezogen ist. Das Drahtgeflecht 21 vermindert in der gleichen Weise wie das Hülsenrohr 15 eine Benetzung des gasführenden Rohres 1 auf der gefährdeten Rohrlänge.The end of a gas-carrying pipe 1 facing the outlet chamber 20 can, as described, be enclosed by a sleeve tube 15 which ends shortly before the outlet chamber 20 or protrudes a little into it. 3 shows a different type of sheathing of the gas-carrying pipe 1, which can optionally also be used in the shell-and-tube heat exchanger according to FIGS. 1 and 2. This sheath consists of a wire mesh 21, which is drawn like a sock over the tube 1. The wire mesh 21 reduces wetting of the gas-carrying pipe 1 on the endangered pipe length in the same way as the sleeve pipe 15.

Claims (3)

1. Heat exchanger, for the cooling of cracking gases with the aid of boiling water as cooling medium, consisting of tubes (1), which are flowed through by the gas to be cooled and surrounded by a cooling jacket (2) flowed through by the cooling medium, wherein each tube (1) is enclosed by a sleeve flowed through by the cooling medium, characterised thereby, that the sleeve surrounds the tube (1) only at the end facing the gas exit and consists of a sleeve tube (15), which is open at both ends and arranged at a spacing from the tube (1) while forming an annular gap, and that the annular gap is so dimensioned that the boiling water is prevented from flowing into the annular gap in a quantity sufficient for the complete wetting of the tube (1).
2. Heat exchanger, for the cooling of cracking gases with the aid of boiling water as cooling medium, consisting of tubes (1), which are flowed through by the gas to be cooled and surrounded by a cooling jacket (2) flowed through by the cooling medium, wherein each tube (1) is enclosed by a sleeve flowed through by the cooling medium, characterised thereby, that the sleeve surrounds the tube (1) only at the end facing the gas exit and consists of a wire gauze (21), which rests on the tube (1) and is so dimensioned that the boiling water is prevented from flowing through the wire gauze (21) in a quantity sufficient for the complete wetting of the tube (1).
3. Heat exchanger according to claim 1, characterised thereby, that the wall of the sleeve tube (15) is provided with passages (18).
EP88106024A 1987-05-12 1988-04-15 Heat exchanger, especially for cooling cracked gases Expired - Lifetime EP0290813B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3715713 1987-05-12
DE3715713A DE3715713C1 (en) 1987-05-12 1987-05-12 Heat exchanger in particular for cooling cracked gases

Publications (2)

Publication Number Publication Date
EP0290813A1 EP0290813A1 (en) 1988-11-17
EP0290813B1 true EP0290813B1 (en) 1991-03-06

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EP88106024A Expired - Lifetime EP0290813B1 (en) 1987-05-12 1988-04-15 Heat exchanger, especially for cooling cracked gases

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US (1) US4858684A (en)
EP (1) EP0290813B1 (en)
JP (1) JPS63297995A (en)
DE (2) DE3715713C1 (en)

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DE3861898D1 (en) 1991-04-11
US4858684A (en) 1989-08-22
JPS63297995A (en) 1988-12-05
DE3715713C1 (en) 1988-07-21
EP0290813A1 (en) 1988-11-17

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