EP0969912A1 - Procede et dispositif pour adsorber une charge entrainee - Google Patents

Procede et dispositif pour adsorber une charge entrainee

Info

Publication number
EP0969912A1
EP0969912A1 EP98917066A EP98917066A EP0969912A1 EP 0969912 A1 EP0969912 A1 EP 0969912A1 EP 98917066 A EP98917066 A EP 98917066A EP 98917066 A EP98917066 A EP 98917066A EP 0969912 A1 EP0969912 A1 EP 0969912A1
Authority
EP
European Patent Office
Prior art keywords
medium
section
sieve
cross
adsorbent
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.)
Withdrawn
Application number
EP98917066A
Other languages
German (de)
English (en)
Inventor
Roderich W. Gräff
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0969912A1 publication Critical patent/EP0969912A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • B01D53/261—Drying gases or vapours by adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/0407—Constructional details of adsorbing systems
    • B01D53/0446—Means for feeding or distributing gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/106—Silica or silicates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/106—Silica or silicates
    • B01D2253/108—Zeolites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/116—Molecular sieves other than zeolites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/80—Water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
    • B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
    • B01D2259/4009—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating using hot gas

Definitions

  • the invention relates to a method for adsorbing a cargo carried by a gaseous or liquid medium, for example moisture from a gas or air stream, by means of an adsorbent through which the medium flows, and a device for carrying out the method.
  • German Offenlegungsschrift 36 25 013 Another / arrangement of the desiccant is shown in German Offenlegungsschrift 36 25 013.
  • the adsorbent is accommodated in a cylindrical sieve body which is flowed through radially.
  • a low pressure loss is achieved with this construction, since the flow area is relatively large in relation to the flow depth.
  • the uniformity of the throughflow is not so favorable, since the inflow and outflow velocity and thus the static pressure of the gas on the inlet and outlet side of the adsorbent through which flow changes over the sieve height and thus also the uniformity of the throughflow.
  • the object of the present invention is to improve the method mentioned at the outset and a device suitable therefor in such a way that the energy expenditure is reduced.
  • the outflow velocity of the medium on the inflow side and on the outflow side of the sieve body is constant over its entire area presented to the medium, the ratio of the depth of the medium flow through the sieve body to the flow cross section being chosen to be as small as possible. This surprisingly ensures that there is less pressure loss of the gas flowing through compared to the previous solutions.
  • the method proposed according to the invention avoids widening or narrowing of the flow cross section in the inflow and outflow zone to the adsorbent and keeps the flow velocity as constant as possible on both sides. This achieves a very good dew point, as is required when using adsorbents for the absorption of molecules from gases, such as molecular sieve or silica gel, as well as an optimal regeneration.
  • the proposed method flows evenly through the gas or the regeneration medium to be dried during the adsorption as well as during the subsequent regeneration phase. Due to the low pressure drop of the gas in the adsorbent flowing through, the energy expenditure for the blower, which pushes or sucks the gas through the adsorbent, is reduced to a wrestle led as far as possible.
  • an equal flow velocity in the direction of flow on the outflow side can be achieved by changing the diameter of the outer tube from the bottom to the bottom the top point of the cone is reduced linearly so that the ring surface flowing through at the top of the cone corresponds to the inner inflow surface at the foot of the cone.
  • the adsorbent to be flowed through is usually held between perforated plates or wire nets.
  • Wire meshes that are as thin as possible are preferred so that they can absorb as little heat as possible during the heating process during regeneration. If the wire nets become very thin, the stability of the sieve body is too low. They lose their shape when they are filled with adsorbents.
  • a conical sieve body has a considerably higher rigidity due to its shape, which makes it possible to use thinner wire meshes for its production. This in turn saves energy when heating and cooling during and at the end of the regeneration process.
  • the conical hollow filter body is extended at the top with a short cylindrical part which is not flowed through by the gas to be dried, but rather serves as a compensating container for the adsorbent. Should the adsorbent collapse somewhat during operation, additional adsorbent automatically flows from the storage container, so that there is no cavity at the upper end of the sieve cone through which a part of the gas to be dried could flow without coming into contact with the adsorbent come.
  • a cone when using a cylindrical hollow screen body, a cone can be formed in the interior thereof are used, which continuously reduces the cross-section from one end to the other and linearly increases the flow space outside the hollow cylinder by increasing the diameter so that the inflow cross-section has the same area as the outflow cross-section.
  • the flow cross section can be optimally manipulated by means of installation bodies in order to be able to be used in accordance with the method.
  • the screen body expediently has an elliptical shape.
  • FIG. 1 shows a first embodiment variant of the drying pot which can be used according to the method and has a conical hollow sieve body
  • FIG. 2 shows a representation of the drying pot which can be used according to the method, in which it is explained how the flow cross section is kept the same size
  • FIG. 3 shows a dry pot which can be used according to the method and with which an identical flow rate is achieved, that the inner diameter of the pot housing is reduced linearly;
  • Fig. 5 is a schematic representation of a system that is operated with the method according to the invention and the corresponding device elements.
  • Plastic granules 16 to be dried are located in a drying hopper 15. Drying air is fed to the drying hopper 15 via a supply air line 17, which penetrates the plastic granules 16 that drips through the drying hopper 15 in countercurrent and at the upper end of the drying hopper 15 as moist air via the exhaust air line 18 is subtracted.
  • the exhaust air line 18 opens into a drying pot 3, which in this exemplary embodiment is installed in the system circuit on both sides through a flange connection 19 on both sides. In terms of flow, in practice several such drying pots 3 are integrated in an exhaust air dryer, identified as a whole by reference number 1.
  • the exhaust air line 18 finds its name in its relative position to the drying hopper 15 and ultimately functions as an inflow pipe 4 for the drying pot 3 during the adsorption phase, while the air supply line 17 has its name in connection with the Drying hopper 15 takes place and opens into the drying pot 3 in the adsorption cycle as a discharge pipe 5.
  • an adsorbent 2 for example silica gel and / or molecular sieve.
  • the adsorbent 2 extracts the moisture carried away from the moist exhaust air, so that it leaves the drying pot 3 as dry air and is fed to the drying hopper 15 again after passing through heating means via the blower 20 via the supply air line 17.
  • the arrangements of the check valves 21 to 24 ensure that the direction of rotation of the blower 20 can be reversed so that outside air can be sucked in via the supply line 25 and pressed through the drying pot 3. This represents the 'so-called regeneration phase, the regeneration hot air absorbs the adsorbed in the adsorbent and water via the discharge line 26 from the circulation.
  • the present invention now improves the process parameters that take place in the drying pot 3, the drying pot being the subject of the device improved according to the invention.
  • the drying pot 3 is indicated schematically in this circuit shown. It is to be clarified here that it has the same effect according to the invention whether the hollow filter body identified by the reference number 6 is flowed through in one direction or the other, as is customary when changing between the adsorption and regeneration phases.
  • the inflow and outflow speed of the gas is constant on both sides of the sieve body and preferably over the entire surface of the sieve body, which is achieved by equal inlet and outlet cross sections above and below the sieve body and in the Ab - and Supply pipes are made and in the apparatus to avoid pressure drops, the screen body, which absorbs the adsorbent, is suitable for creating the same flow cross-sections both on the inside and on the outside. Alternatively, this is achieved by insert bodies that manipulate the flow cross section.
  • the internal situation of the drying head 3 shown in FIG. 5 in the form of a cone represents the schematic representation for both alternatives.
  • a first embodiment of the invention provides for the adsorbent 2 to be accommodated in a conical hollow sieve body 6.
  • the cross section of the inflow tube 4 has the same size as the open bottom 7 of the hollow sieve body 6. There is therefore no widening of the flow cross section from the inflow tube 4 to the hollow sieve body 6 and therefore no pressure loss.
  • the flow velocity in the interior of the cone from the inflow side to the tip 8 of the cone is constant over the entire length, since that from the inside to the outside
  • the amount of gas flowing through the cone corresponds to the decrease in the cross-sectional area of the cone in the direction of flow.
  • a cross section FZ is present in the inflow pipe 4. This corresponds to the cross-section FA of the outflow pipe 5.
  • the flow cross-section is kept the same over the height of the hollow screen body 6, since the sum of the inside and outside cross-sections FI + FA corresponds to the cross-section FA or FZ.
  • the flow velocity VA is therefore also constant and constant over the entire distance, with only negligible pressure drops occurring.
  • a further embodiment of the present invention already provides in the embodiment variant according to FIG. 2, in order to create more favorable, the inventive idea assigned cross-sectional ratios to use inserts that meet the procedural requirements.
  • the open bottom 7 of the hollow sieve body 6 is congruent to the cross section of the inflow tube 4 and the hollow wall 28 of the hollow sieve body 6, in which the adsorbent 2 is received, the annular surface between the passage opening 29 of the inflow tube 4 and the inner wall of the drying pot 3 or its Fills the outer tube 9, the cross-sectional size of the drying pot 3 can lead to flow disturbances compared to the outflow tube 5 of the same size as the inflow tube 4.
  • FIG. 3 shows how the desired flow conditions are created when the adsorption bed and the tube dimensions are dimensioned unfavorably, i.e. if it is not possible to keep the adsorption bed very thin compared to the diameter of the outer tube.
  • FIG. 3 are identified by the same reference numerals as in FIGS. 1 and 2.
  • FIG. 4 shows a proposed solution which fulfills the object on which the invention is based with a cylindrical hollow sieve body 6, in the interior of which Room 12 a conical installation body 11 is inserted.
  • a further Einbaukör ⁇ is - provided by 11 ', which decreases the outflow duct 5 towards linear, so that the inflow cross section to the outflow cross-section corresponds.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Drying Of Gases (AREA)
  • Separation Of Gases By Adsorption (AREA)

Abstract

L'invention concerne un procédé qui permet d'adsorber une charge entraînée par un milieu gazeux ou fluide, telle que l'humidité d'un flux gazeux, au moyen d'une substance adsorbante contenue dans un corps de tamis et traversée par ledit milieu. Selon le procédé de l'invention, afin de réduire la consommation d'énergie, le milieu est amené au corps de tamis puis évacué de ce dernier, de façon que sa vitesse d'amenée et sa vitesse d'évacuation, du côté amenée comme du côté évacuation, soit constante sur toute la surface du tamis en contact avec ledit milieu. Le rapport entre la profondeur à laquelle le milieu traverse le tamis et la section d'écoulement est choisi de façon à être le plus petit possible. L'invention concerne également un dispositif qui permet de mettre en oeuvre ledit procédé.
EP98917066A 1997-03-24 1998-03-24 Procede et dispositif pour adsorber une charge entrainee Withdrawn EP0969912A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19712307 1997-03-24
DE1997112307 DE19712307A1 (de) 1997-03-24 1997-03-24 Verfahren und Vorrichtung zur Adsorption mitgeführter Fracht
PCT/EP1998/001717 WO1998042430A1 (fr) 1997-03-24 1998-03-24 Procede et dispositif pour adsorber une charge entrainee

Publications (1)

Publication Number Publication Date
EP0969912A1 true EP0969912A1 (fr) 2000-01-12

Family

ID=7824438

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98917066A Withdrawn EP0969912A1 (fr) 1997-03-24 1998-03-24 Procede et dispositif pour adsorber une charge entrainee

Country Status (4)

Country Link
EP (1) EP0969912A1 (fr)
JP (1) JP2001518013A (fr)
DE (1) DE19712307A1 (fr)
WO (1) WO1998042430A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4344778A (en) * 1979-05-15 1982-08-17 Mitsubishi Denki Kabushiki Kaisha Water producing apparatus
DE3518367A1 (de) * 1985-05-22 1986-11-27 Linde Ag, 6200 Wiesbaden Adsorbereinheit
US4969936A (en) * 1989-12-26 1990-11-13 Westates Carbon Filtration apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9842430A1 *

Also Published As

Publication number Publication date
WO1998042430A1 (fr) 1998-10-01
JP2001518013A (ja) 2001-10-09
DE19712307A1 (de) 1998-10-01

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