EP0344094B1 - Flash tank for hot fluids under pressure - Google Patents

Flash tank for hot fluids under pressure Download PDF

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Publication number
EP0344094B1
EP0344094B1 EP89730114A EP89730114A EP0344094B1 EP 0344094 B1 EP0344094 B1 EP 0344094B1 EP 89730114 A EP89730114 A EP 89730114A EP 89730114 A EP89730114 A EP 89730114A EP 0344094 B1 EP0344094 B1 EP 0344094B1
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EP
European Patent Office
Prior art keywords
flash
chambers
pressure
condensate
chamber
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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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EP89730114A
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German (de)
French (fr)
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EP0344094A1 (en
Inventor
Helmuth Sauerbrey
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Vodafone GmbH
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Mannesmann AG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B3/00—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass
    • F22B3/04—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass by drop in pressure of high-pressure hot water within pressure- reducing chambers, e.g. in accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/42—Applications, arrangements, or dispositions of alarm or automatic safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
    • F22B37/54—De-sludging or blow-down devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines

Definitions

  • the invention relates to a relaxation device for pressurized hot media, in particular water, according to the preamble of claim 1.
  • lances which are to be regarded as horizontal manifolds.
  • a lance which can have a considerable length, usually opens tangentially into the expansion tank.
  • the individual drains that are opened to the lance via drain valves can lead to hot water with very different pressure levels.
  • evaporation occurs immediately behind the drain valve, with a 2-phase flow (steam / water) forming in the lance.
  • the object of the invention is to provide a relaxation device of the generic type which largely avoids these disadvantages.
  • the basic idea of the invention is to be seen in the fact that a consequent separation of processes of different pressure levels is carried out insofar as a hot medium under pressure with its liquid phase is kept completely separate from liquid media of other pressure levels during the expansion to approximately ambient pressure. This is achieved in that the media streams are introduced into the expansion device in separate lines, the drain valves being arranged close to the expansion device.
  • the relaxation of the media and the associated steam generation (evaporation) takes place in separate relaxation chambers, which are partitioned off from each other by partitions. Only media flows of the same pressure level can be introduced into a common expansion chamber. The expediency of such a joint treatment depends in particular on whether the throughput of the relaxation chamber is adequate for the flow rates to be expected if necessary.
  • the amounts of steam generated during the degassing in the individual expansion chambers immediately pass into a common, large-volume steam collection space, since the expansion chambers are open at the top.
  • the steam can be discharged almost without pressure from the steam collecting space via an exhaust steam line. It is also possible to arrange a heat exchanger in the steam collecting space in order to largely recover the heat energy present in the steam and the liquid medium (eg processed process water) through condensation of the steam.
  • the relaxed liquid medium in the relaxation chamber can flow calmly through a perforated floor into an underlying condensate collecting space, which is common to all relaxation chambers.
  • the condensate level is e.g. always kept at the same level via a process loop or other control device. So that the evaporation still taking place in the condensate collection space does not lead to faults, a pressure compensation line is provided to the steam collection space.
  • the expansion device 1 shown in FIGS. 1 and 2 has a standing, essentially circular-cylindrical housing 2, which is closed by a base through which a condensate drain 8 is guided and by a cover through which an evaporation line 11 is guided.
  • a base through which a condensate drain 8 is guided and by a cover through which an evaporation line 11 is guided.
  • other housing shapes eg with a polygonal cross section
  • numerous radially arranged supply lines 5 open, through which, for example, hot pressurized water can be introduced into the expansion device 1. In Figure 1, only one of these leads 5 is shown.
  • the drain valves (not shown) for opening and closing these supply lines 5 can be attached in the immediate vicinity of the housing shell 2.
  • Each feed line 5 leads into an expansion chamber 4, which is formed in each case between a part of the housing shell 2, two lateral vertical, radially oriented partition walls 3 and a part of a pressure compensation line 10 arranged coaxially to the housing 2.
  • the individual expansion chambers 4 are arranged as sectors around the central pressure compensation line 10. At the bottom, they are closed off by a common perforated base 6 welded to the housing jacket 2, under which the condensate collecting space 7 reaching to the bottom of the housing 2 is located. At the top, all of the relaxation chambers 4 are open to a common steam collecting space 9.
  • Two expansion chambers 4 each have two feed lines 5 of smaller diameter, which are provided for media flows of the same pressure level, while all the others have only a single feed line 5.
  • the dividing walls 4 are welded only to the perforated base 6 and the pressure compensation line 10, which is designed as a conically expanding tube, but not along the contact surface line with the housing 2.
  • each partial flow can relax completely independently and undisturbed from the others. Since the shut-off elements of the feed lines 5 are arranged close to the housing 2, there are no disturbing evaporation and 2-phase flows in the feed lines 5.
  • the pressure water flowing radially into the expansion chamber 4 flows against the central pressure compensation tube 10 and the radially converging partition walls 3.
  • the conical expansion of the pressure compensation tube 10 helps to ensure that the pressure water is not thrown upwards into the steam collection chamber 9, if possible, but rather into the expansion chamber 4 is thrown back.
  • the holding strip 12, which impedes the free access of the hot spray water into the steam collecting space 9, can also make a contribution in this sense.
  • the steam which is produced in the expansion chamber 4 and has an ambient pressure can reach the large-volume steam collecting space 9 almost unhindered and can be discharged from there through the exhaust steam line 11.
  • the relaxed hot water can flow through the perforated base 6 into the condensate collecting space 7, where a constant condensate level is maintained, for example, by a siphon-like drain.
  • the steam that subsequently arises in the condensate collection space 7 can flow unhindered into the steam collection space 9 via the central pressure compensation tube 10.
  • a heat exchanger 13 can be introduced into the condensate collecting space 9.
  • This heat exchanger 13 has a cylindrical inner jacket 14 designed as a perforated jacket, through which the steam can flow into an annular cooling chamber through which heat exchanger tubes 15 pass.
  • the cooling space is closed peripherally by a tight outer jacket 16 and at the top by the disk-shaped distribution channels of the coolant supply line 19 and the coolant discharge line 20.
  • the cooling space is delimited by a bottom 17 which is tightly connected to the housing jacket 2 and which is pulled upwards and directly adjoins the perforated jacket 14.
  • the condensate formed by the cooling can collect above the bottom 17.
  • the condensate level is always held at approximately the same level by a holding device, not shown, which is connected to the condensate drain line 18. Since the outer jacket 16 is immersed in the condensate, the steam collecting space 9 is itself sealed off from the outside, so that practically complete recovery of the process water is possible as long as the coolant supply is sufficient.
  • the condensate level is pressed down as a result of the pressure increase in the steam collection chamber 9 until the excess steam passes past the lower edge of the outer jacket 16 through the annular space between the outer jacket 16 and the housing jacket 2 above in the evaporation chamber 21 and from there, for example can be derived into the atmosphere.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Massaging Devices (AREA)
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Abstract

The invention relates to a flash tank for hot liquid media under pressure, in particular water. In order to be able to carry off the medium, which occurs in at least two different pressure levels, into a flash chamber of the tank without creating vibrations and noise, it is proposed according to the invention that the flash chamber is divided by means of partition walls (3) into neighbouring individual flash compartments (4) which are open to the top to a vapour collecting chamber (9), that the supply pipes (5) for the medium are in each case guided into the flash chamber separately from one another, each supply pipe (5) being assigned to a separate flash compartment (4) or supply pipes (5) of the same pressure levels being assigned to a common flash compartment, that the shut-off members in the supply pipes (5) are arranged in the immediate vicinity of the flash tank (1), that the flash compartments (4) are connected, by means of a perforated bottom (6), to a condensate collecting chamber (7) situated underneath, that the condensate collecting chamber (7) is connected to the vapour collecting chamber (9) via a pressure compensation pipe (10) and that a device for maintaining a condensate level in the condensate collecting chamber (7) is provided. <IMAGE>

Description

Die Erfindung betrifft eine Entspannungsvorrichtung für unter Druck stehende heiße Medien, insbesondere Wasser, gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a relaxation device for pressurized hot media, in particular water, according to the preamble of claim 1.

In thermischen Anlagen wie z.B. Kraftwerken und Fernheizwerken müssen stets Notabläufe und sonstige Abläufe für unter Druck stehende heiße Wässer z.B. an HD-, MD-, ND-Vorwärmern, an Heizungsvorwärmern, Speisewasserbehältern oder Kondensatabläufen von überhitztem Wasserdampf oder dergleichen vorgesehen werden. Das Wasser wird zur Druckentlastung in einem Entspannungsbehälter auf nahezu atmosphärischen Druck entspannt, wobei dies bei hohem Wärmeinhalt des Wassers zu starken Ausdampfungen führt.In thermal systems such as Power plants and district heating plants must always have emergency drains and other drains for pressurized hot water e.g. on HD, MD, LP preheaters, on heating preheaters, feed water tanks or condensate drains of superheated steam or the like. The water is depressurized in a flash tank to almost atmospheric pressure, which leads to strong evaporation when the water is very warm.

Bei bekannten Entspannungsbehältern werden die verschiedenen Abläufe in sogenannten Lanzen, die als horizontal verlaufende Sammelleitungen anzusehen sind, zusammengeführt. Eine Lanze, die eine erhebliche Baulänge aufweisen kann, mündet in der Regel tangential in den Entspannungsbehälter. Die einzelnen Abläufe, die über Ablaufventile zur Lanze hin geöffnet werden, können Heißwasser mit stark unterschiedlichen Druckstufen führen. In der Regel kommt es unmittelbar hinter dem Ablaufventil bereits zur Ausdampfung, wobei sich in der Lanze eine 2-Phasen-Strömung (Dampf/Wasser) ausbildet. Dies bringt ebenso wie das gleichzeitige Ansprechen von Abläufen unterschiedlicher Druckstufen, welches zu einer unerwünschten gegenseitigen Beeinflussung der Abläufe führt, die Entstehung von Schwingungen und Lärm mit sich.In the case of known expansion tanks, the various processes are brought together in so-called lances, which are to be regarded as horizontal manifolds. A lance, which can have a considerable length, usually opens tangentially into the expansion tank. The individual drains that are opened to the lance via drain valves can lead to hot water with very different pressure levels. As a rule, evaporation occurs immediately behind the drain valve, with a 2-phase flow (steam / water) forming in the lance. As well as the simultaneous response of processes of different pressure levels, which leads to an undesirable mutual influencing of the processes, this leads to the generation of vibrations and noise.

Aufgabe der Erfindung ist es, eine Entspannungsvorrichtung der gattungsgemäßen Art anzugeben, die diese Nachteile weitestgehend vermeidet.The object of the invention is to provide a relaxation device of the generic type which largely avoids these disadvantages.

Gelöst wird diese Aufgabe erfindungsgemäß durch eine Entspannungsvorrichtung mit den Merkmalen des Patentanspruchs 1; vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen 2 bis 7 angegeben.This object is achieved according to the invention by a relaxation device with the features of claim 1; Advantageous developments of the invention are specified in subclaims 2 to 7.

Der Grundgedanke der Erfindung ist darin zu sehen, daß eine konsequente Trennung von Abläufen unterschiedlicher Druckstufen insoweit vorgenommen wird, als ein unter Druck stehendes heißes Medium mit seiner flüssigen Phase während der Entspannung auf etwa Umgebungsdruck völlig getrennt gehalten wird von flüssigen Medien anderer Druckstufen. Dies wird dadurch erreicht, daß die Medienströme in separaten Leitungen in die Entspannungsvorrichtung eingeleitet werden, wobei die Ablaufventile dicht an der Entspannungsvorrichtung angeordnet sind. Darüberhinaus findet die Entspannung der Medien und die damit verbundene Dampfentstehung (Ausdampfung) in separaten Entspannungskammern statt, die durch Trennwände gegeneinander abgeschottet sind. Lediglich Medienströme gleicher Druckstufe können in eine gemeinsame Entspannungskammer eingeleitet werden. Die Zweckmäßigkeit einer solchen gemeinsamen Behandlung ist insbesondere davon abhängig, ob die Durchsatzleistung der Entspannungskammer den im Bedarfsfall zu erwartenden Mengenströmen angemessen ist. Die bei der Ausgasung in den einzelnen Entspannungskammern entstehenden Dampfmengen gehen sofort in einen gemeinsamen großvolumig ausgelegten Dampfsammelraum über, da die Entspannungskammern nach oben hin offen sind. Aus dem Dampfsammelraum kann der Dampf über eine Abdampfleitung nahezu drucklos abgeführt werden. Es ist auch möglich, im Dampfsammelraum einen Wärmetauscher anzuordnen, um die im Dampf vorhandene Wärmeenergie und durch Kondensation des Dampfes das flüssige Medium (z.B. aufbereitetes Prozeßwasser) weitgehend zurückzugewinnen.The basic idea of the invention is to be seen in the fact that a consequent separation of processes of different pressure levels is carried out insofar as a hot medium under pressure with its liquid phase is kept completely separate from liquid media of other pressure levels during the expansion to approximately ambient pressure. This is achieved in that the media streams are introduced into the expansion device in separate lines, the drain valves being arranged close to the expansion device. In addition, the relaxation of the media and the associated steam generation (evaporation) takes place in separate relaxation chambers, which are partitioned off from each other by partitions. Only media flows of the same pressure level can be introduced into a common expansion chamber. The expediency of such a joint treatment depends in particular on whether the throughput of the relaxation chamber is adequate for the flow rates to be expected if necessary. The amounts of steam generated during the degassing in the individual expansion chambers immediately pass into a common, large-volume steam collection space, since the expansion chambers are open at the top. The steam can be discharged almost without pressure from the steam collecting space via an exhaust steam line. It is also possible to arrange a heat exchanger in the steam collecting space in order to largely recover the heat energy present in the steam and the liquid medium (eg processed process water) through condensation of the steam.

Das in der Entspannungskammer entspannte flüssige Medium kann beruhigt durch einen Lochboden in einen darunter gelegenen, für alle Entspannungskammern gemeinsamen Kondensatsammelraum, abfließen. Der Kondensatspiegel wird z.B. über eine Ablaufschleife oder eine sonstige Regeleinrichtung stets auf gleichem Niveau gehalten. Damit die im Kondensatsammelraum noch stattfindende Ausdampfung nicht zu Störungen führt, ist eine Druckausgleichsleitung zum Dampfsammelraum hin vorgesehen.The relaxed liquid medium in the relaxation chamber can flow calmly through a perforated floor into an underlying condensate collecting space, which is common to all relaxation chambers. The condensate level is e.g. always kept at the same level via a process loop or other control device. So that the evaporation still taking place in the condensate collection space does not lead to faults, a pressure compensation line is provided to the steam collection space.

Im folgenden wird die Erfindung anhand der abgebildeten Ausführunsbeispiele näher erläutert. Teile mit gleicher Funktion sind dabei mit gleichen Bezugszeichen versehen. Es zeigen:

Figur 1
einen Längsschnitt durch eine erfindungsgemäße Entspannungsvorrichtung,
Figur 2
einen Querschnitt gemäß Linie A-A in Figur 1 und
Figur 3
einen Längsschnitt durch eine erfindungsgemäße Entspannungsvorrichtung mit Wärmetauscher.

The invention is explained in more detail below with the aid of the illustrated exemplary embodiments. Parts with the same function are given the same reference numerals. Show it:
Figure 1
2 shows a longitudinal section through a relaxation device according to the invention,
Figure 2
a cross section along line AA in Figure 1 and
Figure 3
a longitudinal section through an expansion device according to the invention with a heat exchanger.

Die in Figur 1 und 2 dargestellte Entspannungsvorrichtung 1 weist ein stehendes im wesentliches kreiszylindrisches Gehäuse 2 auf, das durch einen Boden, durch den eine Kondensatableitung 8 geführt ist, und durch einen Deckel, durch den eine Abdampfleitung 11 geführt ist, verschlossen ist. Selbstverständlich sind auch andere Gehäuseformen (z.B. mit polygonalem Querschnitt) möglich. Im unteren Teil des Gehäuses 2 münden zahlreiche radial angeordnete Zuleitungen 5, durch die z.B. heißes Druckwasser in die Entspannungsvorrichtung 1 einleitbar ist. In Figur 1 ist lediglich eine dieser Zuleitungen 5 dargestellt.The expansion device 1 shown in FIGS. 1 and 2 has a standing, essentially circular-cylindrical housing 2, which is closed by a base through which a condensate drain 8 is guided and by a cover through which an evaporation line 11 is guided. Of course, other housing shapes (eg with a polygonal cross section) are also possible. In the lower part of the housing 2, numerous radially arranged supply lines 5 open, through which, for example, hot pressurized water can be introduced into the expansion device 1. In Figure 1, only one of these leads 5 is shown.

Die Ablaufventile (nicht dargestellt) zum Öffnen und Schließen dieser Zuleitungen 5 können in unmittelbarer Nähe des Gehäusemantels 2 angebracht werden. Jede Zuleitung 5 führt in eine Entspannungskammer 4, die jeweils zwischen einem Teil des Gehäusemantels 2, je zwei seitlichen vertikalen, radial ausgerichteten Trennwänden 3 und einem Teil einer koaxial zum Gehäuse 2 angeordneten Druckausgleichsleitung 10 gebildet wird. Die einzelnen Entspannungskammern 4 sind als Sektoren um die zentrale Druckausgleichsleitung 10 angeordnet. Nach unten hin sind sie durch einen gemeinsamen am Gehäusemantel 2 angeschweißten Lochboden 6 abgeschlossen, unter welchem der bis zum Boden des Gehäuses 2 reichende Kondensatsammelraum 7 liegt. Nach oben hin sind sämtliche Entspannungskammern 4 zu einem gemeinsamen Dampfsammelraum 9 offen. Zwei Entspannungskammern 4 besitzen jeweils zwei Zuleitungen 5 kleineren Durchmessers, die für Medienströme gleicher Druckstufe vorgesehen sind, während alle übrigen lediglich eine einzige Zuleitung 5 aufweisen. Die Trennwände 4 sind in vorteilhafter Ausgestaltung der Erfindung lediglich mit dem Lochboden 6 und der Druckausgleichsleitung 10, die als konisch sich nach oben erweiterndes Rohr gestaltet ist, verschweißt, nicht aber entlang der Berührungsmantellinie mit dem Gehäuse 2. Hierdurch wird beim Betrieb die Entstehung unkontrollierter thermischer Spannungen im Gehäuse 2 vermieden. Damit beim Betrieb der Entspannungsvorrichtung keine störenden Schwingungen entstehen, sind sämtliche Trennwände 3 an ihrer Oberseite untereinander durch einen angeschweißten, peripher am Gehäusemantel 2 umlaufenden, flachen Haltestreifen 12 verbunden.The drain valves (not shown) for opening and closing these supply lines 5 can be attached in the immediate vicinity of the housing shell 2. Each feed line 5 leads into an expansion chamber 4, which is formed in each case between a part of the housing shell 2, two lateral vertical, radially oriented partition walls 3 and a part of a pressure compensation line 10 arranged coaxially to the housing 2. The individual expansion chambers 4 are arranged as sectors around the central pressure compensation line 10. At the bottom, they are closed off by a common perforated base 6 welded to the housing jacket 2, under which the condensate collecting space 7 reaching to the bottom of the housing 2 is located. At the top, all of the relaxation chambers 4 are open to a common steam collecting space 9. Two expansion chambers 4 each have two feed lines 5 of smaller diameter, which are provided for media flows of the same pressure level, while all the others have only a single feed line 5. In an advantageous embodiment of the invention, the dividing walls 4 are welded only to the perforated base 6 and the pressure compensation line 10, which is designed as a conically expanding tube, but not along the contact surface line with the housing 2. As a result, the occurrence of uncontrolled thermal during operation Tensions in the housing 2 avoided. So that no disturbing vibrations occur during operation of the relaxation device, all the partition walls 3 are connected to one another at their top by a welded flat retaining strip 12 which runs peripherally on the housing jacket 2.

Wenn durch die verschiedenen Zuleitungen 5 heiße Druckwasserströme in die einzelnen Entspannungskammern 4 geleitet werden, so kann sich jeder Teilstrom völlig unabhängig und ungestört von den übrigen entspannen. Da die Absperrorgane der Zuleitungen 5 dicht am Gehäuse 2 angeordnet sind, kommt es in den Zuleitungen 5 nicht zu störenden Ausdampfungen und 2-Phasen-Strömungen. Das radial in die Entspannungskammer 4 einströmende Druckwasser fließt gegen das zentrale Druckausgleichsrohr 10 und die radial zusammenlaufenden Trennwände 3. Die konische Erweiterung des Druckausgleichsrohr 10 trägt dazu bei, daß das Druckwasser möglichst nicht nach oben in den Dampfsammelraum 9 geschleudert wird, sondern möglichst in die Entspannungskammer 4 zurückgeworfen wird. Ebenfalls einen Beitrag in diesem Sinn kann auch der haltestreifen 12 leisten, der den freien Zugang des heißen Spritzwassers in den Dampfsammelraum 9 behindert. Der in der Entspannungskammer 4 entstehende, etwa Umgebungsdruck aufweisende Dampf kann dagegen nahezu ungehindert in den großvolumigen Dampfsammelraum 9 gelangen und von dort durch die Abdampfleitung 11 abgeleitet werden. Das entspannte heiße Wasser kann durch den Lochboden 6 in den Kondensatsammelraum 7 abfließen, wo z.B. durch einen siphonartigen Ablauf ein gleichbleibender Kondensatspiegel aufrechterhalten wird. Der im Kondensatsammelraum 7 noch nachträglich entstehende Dampf kann über das zentrale Druckausgleichsrohr 10 ungehindert in den Dampfsammelraum 9 abströmen. Somit ist beim Betrieb der erfindungsgemäßen Vorrichtung eine sichere Trennung der beiden Phasen Dampf und Flüssigkeit gewährleistet, ohne daß Beeinträchtigungen etwa durch eine gleichzeitig erfolgende Betätigung eines Ablaufs einer anderen Druckstufe zu befürchten sind.If 5 hot pressurized water flows are conducted into the individual expansion chambers 4 through the various supply lines, each partial flow can relax completely independently and undisturbed from the others. Since the shut-off elements of the feed lines 5 are arranged close to the housing 2, there are no disturbing evaporation and 2-phase flows in the feed lines 5. The pressure water flowing radially into the expansion chamber 4 flows against the central pressure compensation tube 10 and the radially converging partition walls 3. The conical expansion of the pressure compensation tube 10 helps to ensure that the pressure water is not thrown upwards into the steam collection chamber 9, if possible, but rather into the expansion chamber 4 is thrown back. The holding strip 12, which impedes the free access of the hot spray water into the steam collecting space 9, can also make a contribution in this sense. In contrast, the steam which is produced in the expansion chamber 4 and has an ambient pressure, for example, can reach the large-volume steam collecting space 9 almost unhindered and can be discharged from there through the exhaust steam line 11. The relaxed hot water can flow through the perforated base 6 into the condensate collecting space 7, where a constant condensate level is maintained, for example, by a siphon-like drain. The steam that subsequently arises in the condensate collection space 7 can flow unhindered into the steam collection space 9 via the central pressure compensation tube 10. Thus, when the device according to the invention is operated, a safe separation of the two phases, vapor and liquid, is ensured, without the risk of impairments, for example due to the simultaneous actuation of a sequence of another pressure level.

In einer Weiterbildung der Erfindung wird dem Wunsch nach Rückgewinnung von Wärmeenergie und Prozeßwasser aus dem sonst verlorenen Abdampf Rechnung getragen. Hierzu kann, wie Figur 3 zeigt, ein Wärmetauscher 13 in den Kondensatsammelraum 9 eingebracht werden. Dieser Wärmetauscher 13 weist einen als Lochmantel ausgebildeten zylindrischen Innenmantel 14 auf, durch den der Dampf in einen ringförmigen von Wärmetauscherrohren 15 durchzogenen Abkühlraum einströmen kann.In a development of the invention, the desire for the recovery of thermal energy and process water from the otherwise lost waste steam is taken into account. For this purpose, as shown in FIG. 3, a heat exchanger 13 can be introduced into the condensate collecting space 9. This heat exchanger 13 has a cylindrical inner jacket 14 designed as a perforated jacket, through which the steam can flow into an annular cooling chamber through which heat exchanger tubes 15 pass.

Der Abkühlraum ist peripher durch einen dichten Außenmantel 16 und nach oben durch die scheibenförmigen Verteilerkanäle der Kühlmittelzuleitung 19 und der Kühlmittelableitung 20 verschlossen. Unten wird der Abkühlraum begrenzt durch einen mit dem Gehäusemantel 2 dicht verbundenen Boden 17, welcher nach innen hochgezogen ist und unmittelbar an den Lochmantel 14 anschließt. Über dem Boden 17 kann sich das durch die Kühlung bildende Kondensat sammeln. Der Kondensatspiegel wird über eine nicht dargestellte Haltevorrichtung, die an die Kondensatabzugsleitung 18 angeschlossen ist, stets auf etwa der gleichen Höhe gehalten. Da der Außenmantel 16 in das Kondensat eintaucht, ist der Dampfsammelraum 9 an sich nach außen dicht abgeschlossen, so daß eine praktisch vollständige Rückgewinnung des Prozeßwassers möglich ist, solange die Kühlmittelversorgung ausreichend ist. Ist diese aber gestört oder sind die Mengen des anfallenden Abdampfes zu groß, so wird der Kondensatspiegel infolge des Druckanstiegs im Dampfsammelraum 9 nach unten gedrückt, bis der überschüssige Dampf an der Unterkante des Außenmantels 16 vorbei durch den Ringraum zwischen Außenmantel 16 und Gehäusemantel 2 hindurch nach oben in den Abdampfraum 21 und von dort z.B. in die Atmosphäre abgeleitet werden kann.The cooling space is closed peripherally by a tight outer jacket 16 and at the top by the disk-shaped distribution channels of the coolant supply line 19 and the coolant discharge line 20. At the bottom, the cooling space is delimited by a bottom 17 which is tightly connected to the housing jacket 2 and which is pulled upwards and directly adjoins the perforated jacket 14. The condensate formed by the cooling can collect above the bottom 17. The condensate level is always held at approximately the same level by a holding device, not shown, which is connected to the condensate drain line 18. Since the outer jacket 16 is immersed in the condensate, the steam collecting space 9 is itself sealed off from the outside, so that practically complete recovery of the process water is possible as long as the coolant supply is sufficient. However, if this is disturbed or if the amounts of waste steam generated are too large, the condensate level is pressed down as a result of the pressure increase in the steam collection chamber 9 until the excess steam passes past the lower edge of the outer jacket 16 through the annular space between the outer jacket 16 and the housing jacket 2 above in the evaporation chamber 21 and from there, for example can be derived into the atmosphere.

Claims (7)

1. Let-down device (1) for pressurized hot fluids, particularly water, in which the fluid to be let down appears in at least two different pressure stages and can be fed through feed lines (5), which can be shut off, into a let-down space fitted with a condensate drain (8) and a waste-steam line (11) for the expanded vapour, characterized by that the let-down space is divided by partitioning walls (3) into adjacent single let-down chambers (4) which upwards open into a vapour header (9); that the feed lines (5) carrying the fluid are connected separately to the let-down space, each feed line (5) being associated with a separate let-down chamber (4) or feed lines (5) of the same pressure stage being associated with a common let-down chamber (4); that the shut-off elements on the feed lines (5) are provided near the let-down device (1); that the let-down chambers (4) communicate through a perforated tray (6) with a condensate collector (7) provided below said let-down chambers (4); that the condensate collector (7) communicates with the vapour header (9) through a pressure-compensation line (10); and that a device is provided for maintaining the condensate level in the condensate collector (7).
2. Let-down device according to claim 1, characterized by that the let-down device (1) comprises an upright, essentially circular cylindrical housing (2) inside which, between the pressure-compensation line (10) arranged coaxially with the housing (2) as a central tube, the partitioning walls (3) of the let-down chambers (4) run in the direction of the housing axis and, radially, towards the shell of the housing (2).
3. Let-down device according to any of claims 1 or 2, characterized by that the feed lines (5) carrying the fluid join the lower part of the let-down chambers (4) while running in approximately radial direction.
4. Let-down device according to claims 2 or 3, characterized by that the pressure-compensation line (10) is conically flared in the upward direction.
5. Let-down device according to any of claims 1 to 4, characterized by that the partitioning walls (3) of the let-down chambers (4) are not welded to the shell of the housing (2), but only to the perforated tray (6) and the pressure-conpensation line (10).
6. Let-down device according to any of claims 1 to 5, characterized by that inside the vapour header (9) a heat exchanger (13) is provided for cooling and condensing the waste vapour.
7. Let-down device according to any of claims 1 to 6, characterized by that the partitioning walls (3) of the let-down chambers (4) are welded on their top ends to an orbicular flat holding strip (12).
EP89730114A 1988-05-26 1989-05-02 Flash tank for hot fluids under pressure Expired - Lifetime EP0344094B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89730114T ATE71200T1 (en) 1988-05-26 1989-05-02 RELEASE DEVICE FOR HOT LIQUIDS UNDER PRESSURE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3818165 1988-05-26
DE3818165A DE3818165C1 (en) 1988-05-26 1988-05-26

Publications (2)

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EP0344094A1 EP0344094A1 (en) 1989-11-29
EP0344094B1 true EP0344094B1 (en) 1992-01-02

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ID=6355318

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89730114A Expired - Lifetime EP0344094B1 (en) 1988-05-26 1989-05-02 Flash tank for hot fluids under pressure

Country Status (5)

Country Link
EP (1) EP0344094B1 (en)
AT (1) ATE71200T1 (en)
DD (1) DD283857A5 (en)
DE (2) DE3818165C1 (en)
NO (1) NO167414C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104235824B (en) * 2014-09-25 2016-02-03 无锡纳润特科技有限公司 The tangential sewage dispersal device of boiler blow-off expander

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU9251998A (en) * 1997-08-28 1999-03-22 Steiner, Walter G. Electric current production and recuperation of water in the atmosphere using solar and wind energy
CN110746025A (en) * 2019-10-28 2020-02-04 中国华电科工集团有限公司 Low-temperature negative-pressure wastewater zero discharge system
CN110746024B (en) * 2019-10-28 2024-08-20 中国华电科工集团有限公司 Low-temperature economizer waste water concentration waste heat recycling device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1579325A (en) * 1977-05-30 1980-11-19 Curwen & Newberry Ltd Blowdown tanks for boller installations
JPS5755304A (en) * 1980-09-22 1982-04-02 Tokyo Shibaura Electric Co Flasher
JPS6179905A (en) * 1984-09-28 1986-04-23 株式会社日立製作所 Drain recovery system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104235824B (en) * 2014-09-25 2016-02-03 无锡纳润特科技有限公司 The tangential sewage dispersal device of boiler blow-off expander

Also Published As

Publication number Publication date
EP0344094A1 (en) 1989-11-29
NO167414B (en) 1991-07-22
DD283857A5 (en) 1990-10-24
NO890843L (en) 1989-11-27
NO167414C (en) 1991-10-30
NO890843D0 (en) 1989-02-28
DE58900654D1 (en) 1992-02-13
ATE71200T1 (en) 1992-01-15
DE3818165C1 (en) 1989-12-28

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