EP1191291B1 - Procédé de régulation pour une installation de rectification cryogénique - Google Patents

Procédé de régulation pour une installation de rectification cryogénique Download PDF

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Publication number
EP1191291B1
EP1191291B1 EP20010122754 EP01122754A EP1191291B1 EP 1191291 B1 EP1191291 B1 EP 1191291B1 EP 20010122754 EP20010122754 EP 20010122754 EP 01122754 A EP01122754 A EP 01122754A EP 1191291 B1 EP1191291 B1 EP 1191291B1
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EP
European Patent Office
Prior art keywords
column
working
relatively high
high pressure
liquid
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.)
Expired - Lifetime
Application number
EP20010122754
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German (de)
English (en)
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EP1191291A1 (fr
Inventor
Horst Corduan
Dietrich Rottmann
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
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Linde GmbH
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Publication date
Priority claimed from DE10047102A external-priority patent/DE10047102A1/de
Application filed by Linde GmbH filed Critical Linde GmbH
Priority to EP20010122754 priority Critical patent/EP1191291B1/fr
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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
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
    • F25J3/04793—Rectification, e.g. columns; Reboiler-condenser
    • 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
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/0429—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams of feed air, e.g. used as waste or product air or expanded into an auxiliary column
    • F25J3/04303—Lachmann expansion, i.e. expanded into oxygen producing or low pressure 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
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04406—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system
    • F25J3/04412—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system in a classical double column flowsheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure 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
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04642—Recovering noble gases from air
    • F25J3/04648—Recovering noble gases from air argon
    • F25J3/04654—Producing crude argon in a crude argon column
    • F25J3/04666—Producing crude argon in a crude argon column as a parallel working rectification column of the low pressure column in a dual pressure main column system
    • F25J3/04672—Producing crude argon in a crude argon column as a parallel working rectification column of the low pressure column in a dual pressure main column system having a top condenser
    • F25J3/04678—Producing crude argon in a crude argon column as a parallel working rectification column of the low pressure column in a dual pressure main column system having a top condenser cooled by oxygen enriched liquid from high pressure column bottoms
    • 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
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
    • F25J3/04793—Rectification, e.g. columns; Reboiler-condenser
    • F25J3/048—Argon recovery
    • 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
    • F25J2235/00—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams
    • F25J2235/58—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams the fluid being argon or crude argon

Definitions

  • the invention relates to a method for regulating the capacity of a cryogenic rectification plant, in which a fluid in a working at a higher pressure column a cryogenic rectification unit is initiated, which at higher Pressure working column and a lower pressure column and at the liquid from the sump of the higher pressure working Column is passed into the lower pressure column.
  • Control methods are known for changing the capacity of a cryogenic rectification plant, in which in the working at higher pressure column Setpoint for the sump level is set as manipulated variable. By changing the Setpoint of the sump level, the plant is on a modified amount of feed fluid set.
  • the change in capacity is also called load change.
  • the known control methods therefore have the goal keep the F / D ratio as constant as possible, so that the products of the Rectification plant for different load cases of the plant the same purity exhibit. This is in all known methods by a regulation of Sump level reached, which uses the level as a control variable.
  • Control methods are known for example from the publications EP 0 684 436 or US 3,912,476 known.
  • the invention is therefore based on the object of a method available provide a cryogenic rectification with consistent product purity Load changes, as well as in case of malfunction with fluctuating amount of input fluid guaranteed.
  • This object is achieved according to the invention in that the amount of liquid, which is taken from the bottom of the working column at higher pressure and the working at lower pressure column is fed via a Flow control is regulated, with a manipulated variable for the flow control a desired flow rate is set and the level of the Liquid in the bottom of the working at higher pressure column without Setpoint setting according to the amount of liquid removed.
  • flow control a FIC unit (Flow Indicated Control) as Control component used.
  • This unit usually has one Flow meter, as well as at least one with the flow meter via a Control line connected, controllable valve on.
  • the cryogenic rectification plant is a cryogenic rectification plant for air separation.
  • Particularly preferred is to increase the Operational safety in addition to flow control a sump level indicator (Level Indicator) whose purpose is to exceed a set maximum value for the sump level, as well as the undershoot a specified minimum value. Appropriately, in the described Under- or overruns issued a warning signal.
  • Level Indicator level Indicator
  • a development of the invention provides that the cryogenic rectification plant in addition to the higher pressure column and the working at lower pressure column an argon column with a Head condenser and liquid from the sump at higher pressure working column in the top condenser and from the top condenser in the lower pressure working column is passed, wherein by means of Flow control a valve is controlled, the amount of zu adopteddem Fluid determined in the working at lower pressure column, and a valve is controlled, the corresponding amount of fluid in the top condenser of the Argon column enter.
  • the degree of opening of the two valves by means of a split-range control specified. This is a division of the sump taken amount of liquid.
  • the distribution of the amount on the two valves specified in proportions.
  • the invention has the advantage that even with fluctuations of Use of fluid only a constant amount of liquid from the bottom of the higher pressure working column is removed. This leaves the diestechniksaufgabe in the working at lower pressure column constant and undisturbed. The rectification remains in the lower pressure column unchanged, good. The product purity is retained. Furthermore, one is Flow control a simple, with little effort on components to be realized, reliable control method.
  • the change in the amount of feed fluid makes each case only in a change of Sump level noticeable, which without setpoint specification according to the Bottom of the working at higher pressure column amount Adjusting fluid.
  • To increase security are just a maximum value and a Minimum value for the sump level. When exceeding the specified Maximum value for the sump level and below the specified level Minimum value is conveniently issued a warning signal. Within this Limits may be the sump level of the column operating at higher pressure or rise without disturbing the rectification.
  • the removal amount of liquid from the sump increased or the amount of feed air reduced. It can also be the feed amount of the nitrogen-rich liquid in the be raised at a lower pressure column or in a storage tank.
  • a working at a higher pressure column 1, a at lower pressure column 2, a subcooler 3, and a FIC control 4 (Flow Indicated Control 4), a valve 5, and a control line 6 are shown.
  • the taken from the bottom of working at higher pressure column 1 Liquid is passed via the subcooler 3 to the FIC control 4, the one Flowmeter has.
  • the flow and the resulting Feed via the valve 5 in the lower pressure column 2 is regulated so that the F / D ratio in the column 2 also change in itself Feed air quantity remains constant.
  • a sump level indicator 7 mounted at the Exceeding a specified maximum value for the sump level and at Falls below a specified minimum value gives a signal.
  • FIG. 2 shows, in addition to those already described in the section on FIG Components an argon column 8, a top condenser 9 of the argon column 8, and a second control line 10, which controls a second valve 11, through the the supply amount of fluid is fed to the overhead condenser 9 of the argon column 8 becomes.
  • the FIC control 4 is executed in this example as a split-range control 4, thereby ensuring that the division of the withdrawn from the sump Amount of liquid to the two valves 5, 11 at a change of Flow rate through the FIC unit is adjusted so that the Readjust valve positions automatically according to their fluid proportions.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Claims (5)

  1. Procédé de régulation de la capacité d'une installation de rectification cryogénique, dans lequel un fluide est introduit dans une colonne (1) fonctionnant à relativement haute pression d'une installation de rectification cryogénique, laquelle présente la colonne (1) fonctionnant à relativement haute pression et une colonne (2) fonctionnant à plus basse pression, et dans lequel le liquide est guidé du puisard de la colonne (1) fonctionnant à relativement haute pression dans la colonne (2) fonctionnant à plus basse pression, caractérisé en ce que la quantité de liquide qui est prélevée du puisard de la colonne (1) fonctionnant à relativement haute pression et qui est alimentée à la colonne (2) fonctionnant à plus basse pression est régulée par le biais d'une régulation de débit (4), une valeur de réglage pour la régulation de débit (4) étant ajustée à une quantité de débit souhaitée et le niveau du liquide dans le puisard de la colonne (1) fonctionnant à relativement haute pression s'ajustant en fonction de la quantité de liquide prélevée sans fourniture de valeur de consigne préalable.
  2. Procédé selon la revendication 1, caractérisé en ce que l'installation de rectification cryogénique est une installation de rectification cryogénique de décomposition de l'air.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'installation de rectification cryogénique présente en plus de la colonne (1) fonctionnant à relativement haute pression et de la colonne (2) fonctionnant à plus basse pression, une colonne d'argon (8) avec un condenseur de tête (9) et du fluide provenant du puisard de la colonne (1) fonctionnant à relativement haute pression est introduit dans le condenseur de tête (9) et du condenseur de tête (9) dans la colonne (2) fonctionnant à plus basse pression, une soupape (5) étant commandée au moyen de la régulation de débit (4), laquelle détermine la quantité de fluide à acheminer dans la colonne (2) fonctionnant à plus basse pression, et une soupape (11) étant commandée, laquelle laisse entrer la quantité correspondante de liquide dans le condenseur de tête (9) de la colonne d'argon (8).
  4. Procédé selon la revendication 3, caractérisé en ce que le degré d'ouverture des deux soupapes (5, 11) est prédéfini au moyen d'une régulation split-range (4).
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que dans le cas d'une augmentation de la capacité d'une installation de rectification cryogénique, aucun liquide riche en azote stocké en dehors de la colonne (1) fonctionnant à relativement haute pression n'est introduit dans la colonne (1) fonctionnant à relativement haute pression.
EP20010122754 2000-09-21 2001-09-21 Procédé de régulation pour une installation de rectification cryogénique Expired - Lifetime EP1191291B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20010122754 EP1191291B1 (fr) 2000-09-21 2001-09-21 Procédé de régulation pour une installation de rectification cryogénique

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10047102 2000-09-21
DE10047102A DE10047102A1 (de) 2000-09-21 2000-09-21 Regelverfahren für eine Tieftemperatur-Rektifikationsanlage
EP01103827 2001-02-15
EP01103827A EP1191290A1 (fr) 2000-09-21 2001-02-15 Méthode de contrôle pour unité de séparation cryogénique de l'air
EP20010122754 EP1191291B1 (fr) 2000-09-21 2001-09-21 Procédé de régulation pour une installation de rectification cryogénique

Publications (2)

Publication Number Publication Date
EP1191291A1 EP1191291A1 (fr) 2002-03-27
EP1191291B1 true EP1191291B1 (fr) 2005-05-04

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EP20010122754 Expired - Lifetime EP1191291B1 (fr) 2000-09-21 2001-09-21 Procédé de régulation pour une installation de rectification cryogénique

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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4784677A (en) * 1987-07-16 1988-11-15 The Boc Group, Inc. Process and apparatus for controlling argon column feedstreams
DE3732363A1 (de) * 1987-09-25 1989-04-06 Linde Ag Verfahren und vorrichtung zum wiederanfahren einer gaszerlegungsanlage
FR2676371B1 (fr) * 1991-05-17 1993-07-23 Air Liquide Colonne de distillation d'air a garnissage ondule-croise.
FR2704632B1 (fr) * 1993-04-29 1995-06-23 Air Liquide Procede et installation pour la separation de l'air.
US5996373A (en) * 1998-02-04 1999-12-07 L'air Liquide, Societe Ananyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Cryogenic air separation process and apparatus

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