EP0795349A1 - Dispositif et procédé pour l'évaporation d'un liquide - Google Patents

Dispositif et procédé pour l'évaporation d'un liquide Download PDF

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Publication number
EP0795349A1
EP0795349A1 EP96107773A EP96107773A EP0795349A1 EP 0795349 A1 EP0795349 A1 EP 0795349A1 EP 96107773 A EP96107773 A EP 96107773A EP 96107773 A EP96107773 A EP 96107773A EP 0795349 A1 EP0795349 A1 EP 0795349A1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
heating fluid
pressure column
liquid
passages
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
EP96107773A
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German (de)
English (en)
Other versions
EP0795349B1 (fr
Inventor
Wilhelm Rohde
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.)
Linde GmbH
Original Assignee
Linde GmbH
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Filing date
Publication date
Application filed by Linde GmbH filed Critical Linde GmbH
Publication of EP0795349A1 publication Critical patent/EP0795349A1/fr
Application granted granted Critical
Publication of EP0795349B1 publication Critical patent/EP0795349B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J5/00—Arrangements of cold exchangers or cold accumulators in separation or liquefaction plants
    • F25J5/002—Arrangements of cold exchangers or cold accumulators in separation or liquefaction plants for continuously recuperating cold, i.e. in a so-called recuperative heat exchanger
    • F25J5/005—Arrangements of cold exchangers or cold accumulators in separation or liquefaction plants for continuously recuperating cold, i.e. in a so-called recuperative heat exchanger in a reboiler-condenser, e.g. within a column
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2250/00—Details related to the use of reboiler-condensers
    • F25J2250/02—Bath type boiler-condenser using thermo-siphon effect, e.g. with natural or forced circulation or pool boiling, i.e. core-in-kettle heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2250/00—Details related to the use of reboiler-condensers
    • F25J2250/04—Down-flowing type boiler-condenser, i.e. with evaporation of a falling liquid film
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2250/00—Details related to the use of reboiler-condensers
    • F25J2250/10—Boiler-condenser with superposed stages
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S62/00—Refrigeration
    • Y10S62/902—Apparatus
    • Y10S62/903—Heat exchange structure

Definitions

  • the invention relates to a device for evaporating a liquid with a first and a second heat exchanger, both heat exchangers containing evaporation passages and passages for a heating fluid, the first heat exchanger is designed as a falling film evaporator and the second heat exchanger is designed as a liquid bath evaporator, and the first heat exchanger has means for introducing heating fluid and means for withdrawing heating fluid and wherein the second heat exchanger has means for introducing heating fluid.
  • Heating fluid is understood to mean any fluid that gives off heat, for example a condensing gas.
  • Heating fluid is understood to mean any fluid that gives off heat, for example a condensing gas.
  • Liquid bath evaporators also called thermosiphon evaporators
  • thermosiphon evaporators are in a liquid bath, the evaporation passages communicating with the liquid bath and the vapor formed emerging from the evaporation passages at the top.
  • falling film evaporators the liquid flows as a film over the walls of the evaporation passages and partially evaporates in the process; the vapor formed flows downward with the liquid and is drawn off at the lower end of the evaporation passages together with the portion remaining in the liquid. Both types have disadvantages.
  • the invention is therefore based on the object of developing a device of the type mentioned at the outset, which can be produced particularly inexpensively, in particular very compactly.
  • the means for withdrawing heating fluid from the first heat exchanger are in flow communication with the means for introducing heating fluid into the second heat exchanger.
  • the two heat exchangers are also serially connected on the heating fluid side, in such a way that the heating fluid first passes through the heating fluid passages of the falling film evaporator and the heating fluid emerging from the falling film evaporator is at least partially, preferably completely or essentially completely supplied to the heating fluid passages of the liquid bath evaporator.
  • Each of the heat exchangers of the invention can be formed from one or more blocks. For example, it is possible to implement the liquid bath evaporator in the form of two or more blocks arranged side by side.
  • the distribution of the heating fluid between the two heat exchangers need not be regulated.
  • the heating fluid passages can be connected directly to one another, for example by means of a single short pipe.
  • the device according to the invention can thus be manufactured very inexpensively.
  • the two heat exchangers are preferably designed as one block, the upper section of the block forming the first heat exchanger and the lower section of the block forming the second heat exchanger. This eliminates the need to collect the heating fluid at the lower end of the first heat exchanger (falling film evaporator) and then to distribute it again over the heating fluid passages of the second heat exchanger (liquid bath evaporator).
  • the block has heating fluid passages running over its entire length or over essentially its entire length.
  • the entire device is thus designed on the heating fluid side like a single heat exchanger block which, for example, has the form of a plate heat exchanger. Only on the evaporation side, in the transition between the first and second heat exchangers, vapor-liquid mixture flowing down from the top (from the falling film evaporator) has to be conducted out of the heat exchanger block, so that the remaining liquid part flows into the liquid bath and the vapor formed can be drawn off. At the same time, the steam generated in the evaporation passages of the second heat exchanger (liquid bath evaporator) must be withdrawn from the heat exchanger block.
  • the device can thus be built in a very simple and inexpensive manner. There are no special measures to connect the heating fluid passages; The special measures in the transition area described above can also be implemented without great effort, preferably in an aluminum plate heat exchanger.
  • the invention further relates to a method for evaporating a liquid according to claim 4.
  • an application of the device and the method in a double column process for air separation according to claim 5 and a corresponding device for low temperature separation of air according to claim 6 are the subject of the invention.
  • the device described above is used as a condenser-evaporator (main condenser) in an air separation double column.
  • the liquid to be evaporated is formed by oxygen-rich bottom liquid in the low-pressure column, the heating fluid by nitrogen-rich top gas in the pressure column, which condenses in the condenser-evaporator.
  • the housing of the device is formed by the jacket 1 of a double column for low-temperature air separation, which has a pressure column 2 and a low-pressure column 3. Of the two columns, only the top and bottom area are shown.
  • the entire condenser-evaporator is designed as a plate heat exchanger block 4. 1 shows one of the evaporation passages.
  • the vertical lines do not represent walls between different passages, but the internals (fins) within one evaporation passage.
  • the arrangement of the passages is shown schematically in cross section in FIG. 2: layer by layer alternate Evaporation passages 15 and 16 heating fluid passages.
  • the height of the passages (distance between two plates) is, for example, 2 to 10 mm.
  • the total number of passages arranged next to one another is, depending on their height, for example 10 to 400.
  • liquid oxygen 5 from the low-pressure column 3 is fed via a distributor 6 to the liquid passages of the first heat exchanger (falling film evaporator), which is formed by the upper section 7 of the block 4.
  • the liquid-vapor mixture is led out of the block 4 laterally and flows into the outer space 10 between the block 4 and the jacket 1.
  • the lower part 9 of the same passages forms the evaporation passages of the second heat exchanger designed as a liquid bath evaporator. They are open on their underside and thus communicate with a liquid bath 11. Upward flowing steam and possibly entrained liquid flow laterally out of block 4 in the transition area 8 (left in the drawing). Through each evaporation passage, a separating strip 17 runs obliquely through the transition area, which separates the first and second heat exchangers from one another.
  • Gaseous nitrogen which is brought up from the top of the pressure column 2 (13), serves as the heating fluid. It is applied to the heating fluid passages 16 of the first heat exchanger 7 via a header 14.
  • the heating fluid passages (not shown in FIG. 1) run in the exemplary embodiment without separation over the entire height of the block 4, that is to say through the first heat exchanger 7, the transition region 8 and the second heat exchanger 9. At most the density or the type of internals (fins ) can change over the height of the heating fluid passages.
  • the nitrogen condensed during the heat exchange with the evaporating oxygen is removed from the bottom of the second heat exchanger 9 via a collector 18 Heating fluid passages are withdrawn and fed via line 19 into a vessel at the top of the pressure column 2.
  • the length (vertical extension) of the first heat exchanger 7 is 1.7 m in a specific example, the second heat exchanger 9 is 2.8 m long;
  • the transition area 8 has an vertical extent of 0.6 m, the stack height of the plates (vertical in FIG. 2) is equal to 1.20 m with a passage height (plate spacing) of 6 mm.
  • the condenser-evaporator combines the functions of two different types of heat exchangers 7, 9 in a block 4 .However, the manufacturing effort is hardly greater than with a conventional plate heat exchanger: While the heating fluid passages can be completely conventional, only a few additional measures are required in the transition area 8 of the evaporation passages , namely the installation of inclined fins and a separating strip 17, and the lateral opening of the evaporation passages. Overall, there is a very inexpensive and compact arrangement that combines the advantages of falling film evaporators and liquid bath evaporators.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Separation By Low-Temperature Treatments (AREA)
EP96107773A 1996-02-14 1996-05-15 Dispositif et procédé pour l'évaporation d'un liquide Expired - Lifetime EP0795349B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19605500A DE19605500C1 (de) 1996-02-14 1996-02-14 Vorrichtung und Verfahren zum Verdampfen einer Flüssigkeit
DE19605500 1996-02-14

Publications (2)

Publication Number Publication Date
EP0795349A1 true EP0795349A1 (fr) 1997-09-17
EP0795349B1 EP0795349B1 (fr) 2001-12-05

Family

ID=7785408

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96107773A Expired - Lifetime EP0795349B1 (fr) 1996-02-14 1996-05-15 Dispositif et procédé pour l'évaporation d'un liquide

Country Status (5)

Country Link
US (1) US5901574A (fr)
EP (1) EP0795349B1 (fr)
JP (1) JPH09273699A (fr)
CN (1) CN1082824C (fr)
DE (2) DE19605500C1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2786858A1 (fr) 1998-12-07 2000-06-09 Air Liquide Echangeur de chaleur
EP1077356A1 (fr) * 1999-08-19 2001-02-21 Linde Aktiengesellschaft Condenseur à circulation multiétagé
EP1094286A1 (fr) * 1999-10-20 2001-04-25 Linde Aktiengesellschaft Procédé et dispositif pour la séparation cryogénique des gaz de l'air
US6430961B1 (en) 1999-10-20 2002-08-13 Linde Aktiengesellschaft Process and device for the low-temperature fractionation of air

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2790546B1 (fr) * 1999-03-01 2001-04-20 Air Liquide Echangeur de chaleur, applications a la vaporisation de liquide sous pression et appareil de distillation d'air equipe d'un tel echangeur
FR2796137B1 (fr) 1999-07-07 2001-09-14 Air Liquide Vaporiseur-condenseur a bain a plaques brasees et son application a un appareil de distillation d'air
US6173586B1 (en) * 1999-08-31 2001-01-16 Praxair Technology, Inc. Cryogenic rectification system for producing very high purity oxygen
FR2807826B1 (fr) 2000-04-13 2002-06-14 Air Liquide Echangeur vaporisateur-condenseur du type a bain
DE10027140A1 (de) * 2000-05-31 2001-12-06 Linde Ag Mehrstöckiger Badkondensator
DE10028866A1 (de) * 2000-06-10 2001-12-20 Messer Ags Gmbh Verfahren und Vorrichtung zur Gewinnung von Argon
FR2817952A1 (fr) * 2000-12-08 2002-06-14 Air Liquide Vaporisateur-condenseur et installation de distillation d'air comportant un tel vaporisateur-condenseur
FR2822079B1 (fr) * 2001-03-16 2003-05-16 Air Liquide Procede et installation de production d'oxygene ultra-pur par distillation d'air
US6393866B1 (en) * 2001-05-22 2002-05-28 Praxair Technology, Inc. Cryogenic condensation and vaporization system
EP1837614A1 (fr) * 2006-03-23 2007-09-26 Linde Aktiengesellschaft Procédé et dispositif pour la vaporisation d'un liquide enrichi en oxygène et procédé et dispositif pour la séparation cryogénique d'air
US9476641B2 (en) * 2007-09-28 2016-10-25 Praxair Technology, Inc. Down-flow condenser reboiler system for use in an air separation plant
KR101234409B1 (ko) * 2009-09-30 2013-02-18 시케이디 가부시키가이샤 액체 기화 시스템
CN101890316B (zh) * 2010-07-08 2012-07-11 宝钢工程技术集团有限公司 液体蒸发和气汽混合方法
US10443931B2 (en) * 2011-09-20 2019-10-15 Linde Aktiengesellschaft Method and device for the cryogenic decomposition of air
US9453674B2 (en) * 2013-12-16 2016-09-27 Praxair Technology, Inc. Main heat exchange system and method for reboiling
CN104197189B (zh) * 2014-07-21 2017-06-30 中国科学院力学研究所 一种液氧气化器装置
US10899728B2 (en) * 2019-04-01 2021-01-26 Delta Separations, Llc System, method and apparatus for cannabinoid mixture separation and solvent recovery
US11774189B2 (en) * 2020-09-29 2023-10-03 Air Products And Chemicals, Inc. Heat exchanger, hardway fin arrangement for a heat exchanger, and methods relating to same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0469780A1 (fr) * 1990-07-31 1992-02-05 The BOC Group plc Ebullition de gaz liquéfié
US5438836A (en) * 1994-08-05 1995-08-08 Praxair Technology, Inc. Downflow plate and fin heat exchanger for cryogenic rectification

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3992168A (en) * 1968-05-20 1976-11-16 Kobe Steel Ltd. Heat exchanger with rectification effect
BE789479A (fr) * 1971-10-01 1973-03-29 Air Liquide Echangeur de chaleur et sa mise en oeuvre
FR2650379B1 (fr) * 1989-07-28 1991-10-18 Air Liquide Appareil de vaporisation-condensation pour double colonne de distillation d'air, et installation de distillation d'air comportant un tel appareil
US5122174A (en) * 1991-03-01 1992-06-16 Air Products And Chemicals, Inc. Boiling process and a heat exchanger for use in the process
FR2674947B1 (fr) * 1991-04-03 1998-06-05 Air Liquide Procede de vaporisation d'un liquide, echangeur de chaleur pour sa mise en óoeuvre, et application a une installation de distillation d'air a double colonne.
FR2733039B1 (fr) * 1995-04-14 1997-07-04 Air Liquide Echangeur de chaleur a plaques brassees, et procede correspondant de traitement d'un fluide diphasique
US5709264A (en) * 1996-03-18 1998-01-20 The Boc Group, Inc. Heat exchanger

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0469780A1 (fr) * 1990-07-31 1992-02-05 The BOC Group plc Ebullition de gaz liquéfié
US5438836A (en) * 1994-08-05 1995-08-08 Praxair Technology, Inc. Downflow plate and fin heat exchanger for cryogenic rectification

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2786858A1 (fr) 1998-12-07 2000-06-09 Air Liquide Echangeur de chaleur
EP1077356A1 (fr) * 1999-08-19 2001-02-21 Linde Aktiengesellschaft Condenseur à circulation multiétagé
EP1094286A1 (fr) * 1999-10-20 2001-04-25 Linde Aktiengesellschaft Procédé et dispositif pour la séparation cryogénique des gaz de l'air
US6430961B1 (en) 1999-10-20 2002-08-13 Linde Aktiengesellschaft Process and device for the low-temperature fractionation of air

Also Published As

Publication number Publication date
JPH09273699A (ja) 1997-10-21
DE59608371D1 (de) 2002-01-17
US5901574A (en) 1999-05-11
CN1161874A (zh) 1997-10-15
CN1082824C (zh) 2002-04-17
EP0795349B1 (fr) 2001-12-05
DE19605500C1 (de) 1997-04-17

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