WO1993017769A1 - Process for evaporating a liquid medium having a variable mass flow - Google Patents

Process for evaporating a liquid medium having a variable mass flow Download PDF

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Publication number
WO1993017769A1
WO1993017769A1 PCT/DE1992/000175 DE9200175W WO9317769A1 WO 1993017769 A1 WO1993017769 A1 WO 1993017769A1 DE 9200175 W DE9200175 W DE 9200175W WO 9317769 A1 WO9317769 A1 WO 9317769A1
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WO
WIPO (PCT)
Prior art keywords
heat exchanger
medium
heat
liquid medium
exchanger housing
Prior art date
Application number
PCT/DE1992/000175
Other languages
German (de)
French (fr)
Inventor
Oskar Schatz
Original Assignee
Oskar Schatz
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 Oskar Schatz filed Critical Oskar Schatz
Priority to PCT/DE1992/000175 priority Critical patent/WO1993017769A1/en
Publication of WO1993017769A1 publication Critical patent/WO1993017769A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D1/00—Evaporating
    • B01D1/16—Evaporating by spraying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D1/00—Evaporating
    • B01D1/04—Evaporators with horizontal tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D1/00—Evaporating
    • B01D1/22—Evaporating by bringing a thin layer of the liquid into contact with a heated surface

Definitions

  • the invention relates to a method for evaporation of a liquid medium with a variable flow rate, in which the medium is passed through a heat exchanger housing and the heat of vaporization is supplied to it in the heat exchanger housing by contact with heat exchanger surfaces running in the flow direction of the medium.
  • the vaporous medium leaves the heat exchanger housing at the upper end, with the liquid medium usually being supplied at the lower end of the housing, thereby promoting the separation of the vaporous from the liquid phase.
  • volume control of the medium on the steam side of the heat exchanger requires a much greater effort, because in addition to the flow control e.g.
  • Pressure and temperature of the vaporous medium are continuously determined and must be taken into account as control parameters.
  • the invention has for its object to improve a method of the type mentioned in such a way that the control of the mass flow can be carried out on the input side of the heat exchanger and is effective without delay on the output side, even if the medium supplied is not in the heat exchanger completely evaporated.
  • REPLACEMENT LEAF This prevents the accumulation of non-evaporated liquid in the area of the heat exchanger, so that a quantity regulation carried out in the area of the liquid medium flowing to the heat exchanger has a delay-free effect on the medium leaving the heat exchanger.
  • the heat exchanger is used to evaporate a fuel which then has to be mixed with an oxidant, an increased vapor pressure is desirable to promote the formation of the mixture.
  • the vapor pressure is regulated by changing the outlet cross section on the heat exchanger housing.
  • a heat exchanger serving as an evaporator as shown in the drawing.
  • a heat exchanger designated overall by 10, encloses, with a housing 12, a steam chamber 14, at the upper end of which an injection valve 16 for a liquid medium to be evaporated is used to regulate the quantity.
  • An outflow opening 18 is located at the deepest point of the steam space 14, so that an accumulation of liquid medium in the steam space 14 is excluded.
  • a line 20 for a heat transfer medium traverses the steam room 14 with a supply line 22 and a return line 24, this line 20 being provided with ribs 26 in the interior of the steam room in order to provide the largest possible heated surface in the form of heat exchanger surfaces 2R create about in the flow direction of the medium in the vertical direction run.
  • the injection valve 16 is arranged such that it injects the liquid medium from above approximately tangentially onto the heat exchanger surfaces.
  • the liquid medium runs down under the influence of gravity on the heat exchanger surfaces 28 and is evaporated by the absorption of heat.
  • the steam flows downward out of the outflow opening 18 under the effect of the steam pressure which is formed, an approximately undevaporated rest of the liquid being carried away by the steam.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

In order to evaporate a liquid medium with a variable mass flow, the medium is downwardly led trough a heat exchanger housing, in which the heat for evaporation is transmitted thereto by contact with heat exchange surfaces that extend in the direction of flow of the medium. The medium then exits the heat exchanger housing through its lowest point.

Description

Verfahren zur Verdampfung eines flüssigen Mediums mit variablem Mengenstrom Process for the evaporation of a liquid medium with a variable volume flow
Beschreibungdescription
Die Erfindung betrifft ein Verfahren zur Verdampfung eines flüssigen Mediums mit variablem Mengenstroπ.,- bei welchem das Medium durch ein Wärmetauschergehäus^ geleitet und ihm im Wärmetauschergehäuse durch Kon¬ takt mit in Strömungsrichung des Mediums verlaufenden Wärmetauscherflächen die Verdampfungswärme zugeführt wird.The invention relates to a method for evaporation of a liquid medium with a variable flow rate, in which the medium is passed through a heat exchanger housing and the heat of vaporization is supplied to it in the heat exchanger housing by contact with heat exchanger surfaces running in the flow direction of the medium.
Es entspricht dem Stand der Technik, daß bei alsIt corresponds to the state of the art that at
Verdampfer dienenden Wärmetauschern das dampfförmige Medium das Wärmetauschergehäuse am oberen Ende vej— läßt, wobei üblicherweise das flüssige Medium am unteren Gehäuseende zugeführt wird, wodurch die Trennung der dampfförmigen von der flüssigen Phase begünstigt wird.Evaporator serving heat exchangers, the vaporous medium leaves the heat exchanger housing at the upper end, with the liquid medium usually being supplied at the lower end of the housing, thereby promoting the separation of the vaporous from the liquid phase.
ERSATZBLATT Findet die Verdampfung im Rahmen eines Verfahrens statt, das eine schnelle Veränderung des Mengenstroms des zu verdampfenden Mediums in Abhängigkeit von Steuer- oder Regelparametern erfordert, so kann bei der bekannten Verfahrensweise zwar der Zustrom des flüssi-gen Mediums zum verdampfenden Wärmetauscher einer verzögerungsfreien Mengenregelung unterworfen werden, die sich jedoch am Ausgang des Wärmetauschers erst mit einer gegebenenfalls sehr beachtlichen Ver- zögerung bemerkbar macht. Die Ursache hierfür ist das sich am unteren Ende des Wärmetauschergehäuses sam¬ melnde flüssige Medium, dessen Menge schwankt und das bei einer Reduzierung der dem Wärmetauscher zugeführ¬ ten Menge des flüssigen Mediums zunächst den Übergang auf die gewünschte Verdampfungsrate verzögert, bis sich einneues Gleichgewicht im Dampfräum einstellt.REPLACEMENT LEAF If the evaporation takes place in the context of a method that requires a rapid change in the volume flow of the medium to be evaporated depending on control or regulating parameters, then in the known method the inflow of the liquid medium to the evaporating heat exchanger can be subjected to a delay-free quantity control which, however, only becomes noticeable at the outlet of the heat exchanger with a possibly considerable delay. The reason for this is the liquid medium collecting at the lower end of the heat exchanger housing, the amount of which fluctuates and which, when the amount of liquid medium supplied to the heat exchanger is reduced, initially delays the transition to the desired evaporation rate until a new equilibrium is found in the steam room sets.
Die Mengenregelung des Mediums auf der Dampfseite des Wärmetauschers erfordert einen wesentlich größeren Aufwand, weil zusätzlich zur Zuflußregelung z.B.The volume control of the medium on the steam side of the heat exchanger requires a much greater effort, because in addition to the flow control e.g.
Druck und Temperatur des dampfförmigen Mediums lau¬ fend ermittelt und als Regelparameter mit berücksich¬ tigt werden müssen.Pressure and temperature of the vaporous medium are continuously determined and must be taken into account as control parameters.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfah¬ ren der eingangs genannten Art so zu verbessern, daß die Regelung des Mengenstroms auf der Eingangsseite des Wärmetauschers durchgeführt werden kann und ver¬ zögerungsfrei auf der Ausgangsseite wirksam wird, selbst wenn das zugeführte Medium im Wärmetauscher nicht vollständig verdampft.The invention has for its object to improve a method of the type mentioned in such a way that the control of the mass flow can be carried out on the input side of the heat exchanger and is effective without delay on the output side, even if the medium supplied is not in the heat exchanger completely evaporated.
Die Lösung dieser Aufgabe besteht darin, daß das Medium das Wärmetauschergehäuse von oben nach untenThe solution to this problem is that the medium the heat exchanger housing from top to bottom
durchströmt und an der tiefsten Stelle des Wärmetau¬ schergehäuses austritt.flows through and exits at the lowest point of the heat exchanger housing.
ERSATZBLATT Dadurch wird die Ansammlung nicht verdampfter Flüs- sigkeit im Bereich des Wärmetauschers unterbunden, so daß eine im Bereich des dem Wärmetauscher zuströmen¬ den, flüssigen Mediums durchgeführte Mengenregelung sich verzögerungsfrei auf das den Wärmetauscher ver¬ lassende Medium auswirkt.REPLACEMENT LEAF This prevents the accumulation of non-evaporated liquid in the area of the heat exchanger, so that a quantity regulation carried out in the area of the liquid medium flowing to the heat exchanger has a delay-free effect on the medium leaving the heat exchanger.
Wird der Wärmetauscher zur Verdampfung eines Brenn¬ stoffs benutzt, der anschließend mit einem Oxydanten vermischt werden muß , ist zur Förderung der Gemisch¬ bildung ein angehobener Dampfdruck wünschenswert. Hierzu stellt es eine zweckmäßige Ausgestaltung des Verfahrens dar, daß durch Veränderung des Austritts¬ querschnitts am Wärmetauschergehäuse der Dampfdruck geregelt wird.If the heat exchanger is used to evaporate a fuel which then has to be mixed with an oxidant, an increased vapor pressure is desirable to promote the formation of the mixture. For this purpose, it is an expedient embodiment of the method that the vapor pressure is regulated by changing the outlet cross section on the heat exchanger housing.
Anhand eines in der Zeichnug dargestellten Ausfüh¬ rungsbeispiels eines als Verdampfer dienenden Wärme¬ tauschers wird die Erfindung näher erläutert. Ein insgesamt mit 10 bezeichneter Wärmetauscher umschließt mit einem Gehäuse 12 einen Dampfräum 14, an dessen oberem Ende ein der Mengenregelung dienen¬ des Einspritzventil 16 für ein flüssiges, zu verdamp¬ fendes Medium angeordnet ist. Eine Ausströmöffnung 18 befindet sich an der tiefsten Stelle des Dampfraums 14, so daß eine Ansammlung von flüssigem Medium im Dampfräum 14 ausgeschlossen ist.The invention is explained in more detail on the basis of an exemplary embodiment of a heat exchanger serving as an evaporator as shown in the drawing. A heat exchanger, designated overall by 10, encloses, with a housing 12, a steam chamber 14, at the upper end of which an injection valve 16 for a liquid medium to be evaporated is used to regulate the quantity. An outflow opening 18 is located at the deepest point of the steam space 14, so that an accumulation of liquid medium in the steam space 14 is excluded.
Eine Leitung 20 für einen Wärmeträger durchquert mit einer Zuleitung 22 und einer Rückflußleitung 24 den Dampfräum 14, wobei diese Leitung 20 im Inneren des Dampfraums mit Rippen 26 versehen ist, um eine mög¬ lichst große, beheizte Oberfläche in Form von Wärme¬ tauscherflächen 2R zu schaffen, die etwa in der Durchströ richtung des Mediums in vertikaler Richtung verlaufen. Das Einspritzventil 16 ist so angeordnet, daß es das flüssige Medium von oben etwa tangential auf die Wärmetauscherflächen aufspritzt.A line 20 for a heat transfer medium traverses the steam room 14 with a supply line 22 and a return line 24, this line 20 being provided with ribs 26 in the interior of the steam room in order to provide the largest possible heated surface in the form of heat exchanger surfaces 2R create about in the flow direction of the medium in the vertical direction run. The injection valve 16 is arranged such that it injects the liquid medium from above approximately tangentially onto the heat exchanger surfaces.
Das flüssige Medium läuft unter dem Einfluß der Schwerkraft an den Wärmetauscherflächen 28 nach unten und wird durch Wärmeaufnahme verdampft. Der Dampf strömt unter der Wirkung des sich bildenden Dampf¬ drucks nach unten aus der Ausströmöffnung 18 ab, wobei ein etwa unverdampft gebliebender Rest der Flüssigkeit vom Dampf mitgerissen wird.The liquid medium runs down under the influence of gravity on the heat exchanger surfaces 28 and is evaporated by the absorption of heat. The steam flows downward out of the outflow opening 18 under the effect of the steam pressure which is formed, an approximately undevaporated rest of the liquid being carried away by the steam.
ERSATZBLATT REPLACEMENT LEAF

Claims

Patentansprüche: Claims:
1. Verfahren zur Verdampfung eines flüssigen Mediums mit variablem Mengenstrom, bei welchem das Medium durch ein Wärmetauschergehäuse geleitet und ihm im Wärmetauschergehäuse durch Kontakt mit in - Strömungsrichung des Mediums verlaufenden Wärmetau¬ scherflächen die Verdampfungswärme zugeführt wird, dadurch gekennzeichnet, daß das Medium das Wärmetau- schergehäuse von oben nach unten durchströmt und an der tiefsten Stelle des Wärmetauschergehäuses austritt .1. Process for the evaporation of a liquid medium with a variable flow rate, in which the medium is passed through a heat exchanger housing and the evaporation heat is supplied to it in the heat exchanger housing by contact with heat exchanger surfaces running in the flow direction of the medium, characterized in that the medium exchanges the heat flows through the shear housing from top to bottom and emerges at the lowest point of the heat exchanger housing.
2. Verfahren nach Anspruch 1, dadurch gekenn- zeichnet, daß durch Veränderung des Austrittsquer¬ schnitts am Wärmetauschergehäuse der Dampfdruck gere¬ gelt wird.2. The method according to claim 1, characterized in that the vapor pressure is regulated by changing the outlet cross-section on the heat exchanger housing.
3. Verfahren nach Anspruch 2, dadurch gekennzeich- net , daß der Austrittsquerschnitt unter berücksich- tigung des Wärmestroms verändert wird.3. The method according to claim 2, characterized in that the outlet cross-section is changed taking into account the heat flow.
ERSATZBLATT ZusammenfassungER S ATZBLATT Summary
Zur Verdampfung eines flüssigen Mediums mit variablem Mengenstrom wird das Medium von oben nach unten durch ein Wärmetauschergehäuse geleitet, wobei ihm im Wär¬ metauschergehäuse durch Kontakt mit in Strömungsrich¬ tung des Mediums verlaufenden Wärmetauscherflächen die Verdampfungswärme zugeführt wird, und tritt dann an der tiefsten Stelle des Wärmetauschergehäuses aus.To evaporate a liquid medium with a variable flow rate, the medium is passed from top to bottom through a heat exchanger housing, the heat of vaporization being supplied to it in the heat exchanger housing by contact with heat exchanger surfaces running in the direction of flow of the medium, and then occurs at the deepest point of the Exchanger housing.
Figure imgf000008_0001
Figure imgf000008_0001
PCT/DE1992/000175 1992-03-03 1992-03-03 Process for evaporating a liquid medium having a variable mass flow WO1993017769A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/DE1992/000175 WO1993017769A1 (en) 1992-03-03 1992-03-03 Process for evaporating a liquid medium having a variable mass flow

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE1992/000175 WO1993017769A1 (en) 1992-03-03 1992-03-03 Process for evaporating a liquid medium having a variable mass flow

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19747034A1 (en) * 1997-10-24 1999-04-29 Dbb Fuel Cell Engines Gmbh Device for evaporating and superheating a liquid reactant mass flow

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL109726C (en) *
US2914120A (en) * 1957-01-09 1959-11-24 Dow Chemical Co Devolatilizer
US3191662A (en) * 1962-07-18 1965-06-29 Kenneth J Schneider Continuous solution concentrator
US3298797A (en) * 1965-11-29 1967-01-17 Hooker Chemical Corp Alkali metal hydroxide evaporation
FR1579254A (en) * 1967-09-04 1969-08-22
US4764254A (en) * 1987-05-21 1988-08-16 Rosenblad Corporation Falling film liquor heater having a screen to prevent clogging of a liquid distributing tray

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL109726C (en) *
US2914120A (en) * 1957-01-09 1959-11-24 Dow Chemical Co Devolatilizer
US3191662A (en) * 1962-07-18 1965-06-29 Kenneth J Schneider Continuous solution concentrator
US3298797A (en) * 1965-11-29 1967-01-17 Hooker Chemical Corp Alkali metal hydroxide evaporation
FR1579254A (en) * 1967-09-04 1969-08-22
US4764254A (en) * 1987-05-21 1988-08-16 Rosenblad Corporation Falling film liquor heater having a screen to prevent clogging of a liquid distributing tray

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19747034A1 (en) * 1997-10-24 1999-04-29 Dbb Fuel Cell Engines Gmbh Device for evaporating and superheating a liquid reactant mass flow

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