WO1995008381A1 - Distributeur de fluide pour un distillateur a membrane et procede d'utilisation dudit distillateur - Google Patents

Distributeur de fluide pour un distillateur a membrane et procede d'utilisation dudit distillateur Download PDF

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Publication number
WO1995008381A1
WO1995008381A1 PCT/FI1994/000423 FI9400423W WO9508381A1 WO 1995008381 A1 WO1995008381 A1 WO 1995008381A1 FI 9400423 W FI9400423 W FI 9400423W WO 9508381 A1 WO9508381 A1 WO 9508381A1
Authority
WO
WIPO (PCT)
Prior art keywords
main channel
liquid
batten
feeding channels
channels
Prior art date
Application number
PCT/FI1994/000423
Other languages
English (en)
Inventor
Tapio Kordelin
Original Assignee
Oy Shippax Ltd.
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 Oy Shippax Ltd. filed Critical Oy Shippax Ltd.
Priority to AU76994/94A priority Critical patent/AU7699494A/en
Publication of WO1995008381A1 publication Critical patent/WO1995008381A1/fr

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/008—Liquid distribution

Definitions

  • the object of this invention is the fluid distributor of a membrane distiller, comprised of a batten at the upper end of a bag-like distilling element made of membrane material, the batten comprising parallel feeding channels for distributing vaporizable liquid transversally on the outer surface of the element.
  • the membrane distiller is a device comprised of flat bag-like elements placed against each other and made of thin membrane material such as plastic membrane.
  • the heat transfer is carried out inside the elements from condensing steam through the membrane to the vaporizable liquid running along the outer surfaces of the elements.
  • the heating steam is steam which is generated on the outer surfaces of the elements and fed inside the elements through a compressor to be condensed into the distillate obtained as the end product of the process.
  • a typical use of a membrane distiller has been the production of fresh water from sea water. In addition, it has been recently applied to evaporation treatments of suspensions containing solid matter.
  • Publication print Fl 86961 discloses a distillation element of a membrane distiller comprising a honeycomb-structured end batten at its upper end, the feeding of vaporizable liquid to the outer surfaces of the element being carried out from the end batten.
  • the batten is provided with parallel inclined feeding channels starting from one end thereof, the feeding channels being in contact with a fluid container on the side of the elements and distributing the vaporizable liquid along the whole width of the element surface.
  • the battens also contain steam channels for the steam pressurized by the compressor and entering the elements.
  • the purpose of this invention is to form a batten-like liqui distributor of a membrane distiller, containing parallel feedin channels, in which said drawbacks of known solutions ar avoided.
  • the invention is characterized in that the batte situated at the upper end of the distillation element contain the transversal main channel of the element, the paralle feeding channels leading to the surface of the element branchin from the main channel.
  • the main channel ca be formed essentially wider than the feeding channels o approximately the same length branching from it, whereby th main channel distributes liquid evenly to the feeding channels, the liquid spreading out on the surface of the element as a essentially even transversal front. It has been further notice that a turbulence generated in the main channel can be used t prevent blocking of the feeding channels, making the solutio especially suitable for the evaporation treatment of liqui suspensions containing solid particles.
  • the main channel is led through the batten so that i distributes part of the liquid flow to the feeding channel while the rest exits through the outlet of the main channel.
  • th turbulence generated by the liquid flow of the main channel ha been proven to keep the solid particles mainly in the flow o the main channel where they end up in the outlet of the channe without getting to the membrane surfaces of the distillatio elements through the feeding channels.
  • Mainly only the liqui phase is separated in the feeding channels and on the surfaces of the elements.
  • Another advantage in addition to the feedin channels remaining unblocked is that the need to clean th elements is decreased.
  • main channel is essentially evenly wide and slighty inclined downwards and the feeding channels are branched diagonally backwards from the main channel.
  • the batten forming the liquid distributor so that it comprises two main channels situating in different halves of the element, and that the feeding channels branching from each main channel are orientated towards the vertical centre line of the element.
  • the inlets and outlets of the main channels can be situated in the opposite ends of the batten, while each main channel is deflected by a bend of about 180° near the centre line of the element, whereby the feeding channels are branched from the main channel in the portion between said bend and the outlet of the main channel.
  • the flow in the main channel can effectively cause turbulence effectively with the aid of the bend situated in the main channel before the branching points of the feeding channels.
  • the purpose of the orientation of the feeding channels is to ensure that no dead space without liquid remains in the middle of the element.
  • the liquid distributor according to the invention it is preferable to connect the liquid distributor according to the invention to the bag-like distillation element as an integral end batten.
  • the batten can also comprise, in a manner known per se, steam channels leading inside the element.
  • the batten-like liquid distributor according to the invention it is possible for the batten-like liquid distributor according to the invention to form, in the membrane distiller, an element separate of the bag-like distillation elements.
  • Another object of the invention is the use of the membrane distiller provided with the above-described liquid distributors according to the invention in evaporation treatment of liquid suspensions containing solid particles, especially fiber suspensions such as the waste liquor from pulping. We refer to Claims 9 and 10 with respect to these applications of use.
  • Fig. 1 shows the upper end of the bag-like distillation element of the membrane distiller with its batten serving as the liquid distributor, as viewed from the front, and
  • Fig. 2 shows the upper ends of two adjacent distillation elements with their liquid distributing battens, as section II-
  • Distillation elements 1 are included in the membrane distiller which can comprise a large number of mutually similar elements placed against one another according to Fig. 2.
  • Each element 1 comprises a bag formed by two membrane layers 4 joined to each other using spot welds 3 or the like and joined together by edges 2 thereof, and end batten 5 transversal to the element and situated at the upper end of the element, serving as the liquid distributor.
  • Batten 5 is intended to feed, onto membrane surface 4 forming the outer surface of the element, the liquid which is evaporated by the effect of the heat transfer from the condensing steam fed inside the element between the membrane layers.
  • the steam formed on membrane surfaces 4 of the elements is used as heating steam and recycled inside the elements through a compressor (not shown).
  • End batten 5 of the element serving as the liquid distributor contains sets of channels in the left and right halves of the element which are mirror-images of each other according to Fig. 1.
  • Each set of channels comprises wider main channel 6 whose inlet and outlet 7, 8 are situated at the end 9 of the batten, the main channel being deflected by bend 10 of about 180° in the vicinity of the vertical centre line (dashed line 11 in Fig. 1) of the element.
  • Main channel 6 is evenly wide and slightl downwards inclined between bend 10 and outlet 8, and in thi span a number of feeding channels 12 leading to membrane surfac 4 of the element are branched from it in a comb-like manner, th feeding channels being of the same mutual length and orientate diagonally backwards from the main channel towards said centr line 11 of the element.
  • Fig. 1 shows the flowing of vaporizabl fiber suspension 13 in the left-hand channels, while the right hand channels are only provided with arrows illustrating th flowing.
  • liquid distributor 5 shown in the drawing provides as even as possible distribution of vaporizable liqui on membrane surface 4 of the element.
  • Another purpose is t enable the evaporation treatment of liquid suspensions such a fiber suspension 13 containing solid particles, utilizing th turbulence caused by the streams in main channels 6, preventin the blocking of feeding channels 12 branching from the mai channel, in accordance with observations.
  • the illustrated batten-like liquid distributor 5 can be manufactured from plastics, for instance, by tying formed pieces 14 limiting main channels 6 and feeding channels 12 between two opposite plastic sheets 15 (cf. Fig. 2). It is also possible to connect the steam channels leading inside elements 1 to batten ⁇ like liquid distributor 5, the steam channels not being shown in the drawing being unessential to the invention. It is further possible to include, in the liquid distributor, common or separate sets of liquid channels which feed liquid to both membrane surfaces 4 of the same element l. In the solution according to Fig. 2 each liquid distributor 5 feeds liquid to opposite membrane surfaces 4 of two adjacent elements 1. Liquid distributors 5 of adjacent elements are drawn at a small distance from each other in Fig. 2 for the sake of clarity, but in practice they are pressed against one another during the operation of the distiller. It is clear to those skilled in the art that differe applications of the invention are not limited to the abov described example but can vary within the appended Claims.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

L'invention concerne un distributeur de liquide pour un distillateur à membrane ainsi que l'utilisation d'un distillateur à membrane doté de ce type de distributeur. Ledit distributeur à membrane comprend plusieurs éléments de distillation de type sac (1) formés dans une membrane et conçus pour évaporer le liquide acheminé vers les surfaces extérieures (4) des éléments au moyen de la chaleur transférée par condensation de la vapeur à l'intérieur de ces derniers, la vapeur produite étant transformée en vapeur de chauffage dans les éléments par l'intermédiaire d'un compresseur, et la vapeur de chauffage étant condensée pour former un distillat constituant le produit final. Le distributeur de liquide comprend un battant (5) qui est doté de canaux d'alimentation parallèles (12) distribuant le liquide vaporisable sur la surface extérieure (4) et qui est situé au niveau de l'extrémité supérieure de l'élément de distillation (1). Ce battant (5) contient un canal principal (6) transversal par rapport à l'élément (1), des canaux d'alimentation parallèles (12) aboutissant à la surface (4) de l'élément connecté sur le canal principal. Une partie du courant de liquide peut être acheminé par les canaux d'alimentation jusqu'à la sortie (8) du canal principal. Une turbulence est générée dans le courant de liquide du canal principal (6) de manière à empêcher le blocage des canaux d'alimentation (12). Ainsi, le distillateur selon l'invention peut être utilisé dans divers traitements tels que le traitement par évaporation de suspension fibreuse (13).
PCT/FI1994/000423 1993-09-22 1994-09-21 Distributeur de fluide pour un distillateur a membrane et procede d'utilisation dudit distillateur WO1995008381A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU76994/94A AU7699494A (en) 1993-09-22 1994-09-21 Fluid distributor of a membrane distiller and the use of the distiller

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI934143 1993-09-22
FI934143A FI94217C (fi) 1993-09-22 1993-09-22 Kalvotislaimen nesteenjakaja sekä tislaimen käyttö

Publications (1)

Publication Number Publication Date
WO1995008381A1 true WO1995008381A1 (fr) 1995-03-30

Family

ID=8538637

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1994/000423 WO1995008381A1 (fr) 1993-09-22 1994-09-21 Distributeur de fluide pour un distillateur a membrane et procede d'utilisation dudit distillateur

Country Status (3)

Country Link
AU (1) AU7699494A (fr)
FI (1) FI94217C (fr)
WO (1) WO1995008381A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996009872A1 (fr) * 1994-09-27 1996-04-04 Hadwaco Ltd. Oy Repartiteur de liquide pour un evaporateur
WO1997007867A1 (fr) * 1995-08-22 1997-03-06 Hadwaco Ltd Oy Distributeur de liquide pour evaporateur
WO2000059598A1 (fr) * 1999-04-01 2000-10-12 Hadwaco Ltd Oy Procede d'evaporation d'une solution et evaporateur mis en oeuvre dans ledit procede
US6395139B1 (en) * 1998-10-30 2002-05-28 The Boc Group, Inc. Feed distributor for a liquid distributor of a distillation column
CN111214842A (zh) * 2020-02-19 2020-06-02 宁波巨化化工科技有限公司 一种副产硫酸中轻组分去除工艺及去除装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3724522A (en) * 1971-05-10 1973-04-03 Boeing Co Constant velocity uniform flow evaporator header
FR2591504A1 (fr) * 1985-12-13 1987-06-19 Centre Nat Rech Scient Procede d'evaporation-condensation de films ruisselants, elements pour sa mise en oeuvre et ses applications.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3724522A (en) * 1971-05-10 1973-04-03 Boeing Co Constant velocity uniform flow evaporator header
FR2591504A1 (fr) * 1985-12-13 1987-06-19 Centre Nat Rech Scient Procede d'evaporation-condensation de films ruisselants, elements pour sa mise en oeuvre et ses applications.

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996009872A1 (fr) * 1994-09-27 1996-04-04 Hadwaco Ltd. Oy Repartiteur de liquide pour un evaporateur
AU689957B2 (en) * 1994-09-27 1998-04-09 Ebara Corporation Liquid distributor for an evaporator
US5904807A (en) * 1994-09-27 1999-05-18 Hadwaco Ltd. Oy Liquid distributor for an evaporator
WO1997007867A1 (fr) * 1995-08-22 1997-03-06 Hadwaco Ltd Oy Distributeur de liquide pour evaporateur
US6068730A (en) * 1995-08-22 2000-05-30 Hadwaco Ltd Oy Liquid distributor for evaporator
US6395139B1 (en) * 1998-10-30 2002-05-28 The Boc Group, Inc. Feed distributor for a liquid distributor of a distillation column
WO2000059598A1 (fr) * 1999-04-01 2000-10-12 Hadwaco Ltd Oy Procede d'evaporation d'une solution et evaporateur mis en oeuvre dans ledit procede
US6966974B1 (en) * 1999-04-01 2005-11-22 Oy Casparado Ab Process for evaporating a solution and an evaporator for use in the process
CN111214842A (zh) * 2020-02-19 2020-06-02 宁波巨化化工科技有限公司 一种副产硫酸中轻组分去除工艺及去除装置
CN111214842B (zh) * 2020-02-19 2021-09-24 宁波巨化化工科技有限公司 一种副产硫酸中轻组分去除工艺及去除装置

Also Published As

Publication number Publication date
FI934143A0 (fi) 1993-09-22
AU7699494A (en) 1995-04-10
FI94217B (fi) 1995-04-28
FI94217C (fi) 1995-08-10

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