EP0341232B1 - Grille de ruisellement à protubérances - Google Patents

Grille de ruisellement à protubérances Download PDF

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Publication number
EP0341232B1
EP0341232B1 EP89870060A EP89870060A EP0341232B1 EP 0341232 B1 EP0341232 B1 EP 0341232B1 EP 89870060 A EP89870060 A EP 89870060A EP 89870060 A EP89870060 A EP 89870060A EP 0341232 B1 EP0341232 B1 EP 0341232B1
Authority
EP
European Patent Office
Prior art keywords
grid
ribs
horizontal
grid according
edges
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
EP89870060A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0341232A1 (fr
Inventor
Michel Willy Jean Paul René Monjoie
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.)
Engetra SA
Original Assignee
Engetra SA
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 Engetra SA filed Critical Engetra SA
Priority to AT89870060T priority Critical patent/ATE72483T1/de
Publication of EP0341232A1 publication Critical patent/EP0341232A1/fr
Application granted granted Critical
Publication of EP0341232B1 publication Critical patent/EP0341232B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F25/00—Component parts of trickle coolers
    • F28F25/02—Component parts of trickle coolers for distributing, circulating, and accumulating liquid
    • F28F25/08—Splashing boards or grids, e.g. for converting liquid sprays into liquid films; Elements or beds for increasing the area of the contact surface
    • F28F25/087—Vertical or inclined sheets; Supports or spacers

Definitions

  • the invention relates to a trickle grid for a material and heat exchange body in direct contact between a liquid falling by gravity and a gas passing against the current or cross currents according to the preamble of claim 1.
  • This exchange body is intended for various installations where an exchange of matter and heat is sought between a liquid and a gas, both for the cooling of a liquid by a gas and for the cooling of a gas by a liquid.
  • An important application is in atmospheric refrigerants and cooling towers, where the gas is atmospheric air and where the liquid is water or an aqueous solution. Degassing liquids and purifying gases are other possible applications.
  • the exchange body consists of a set of vertical grids or lattices arranged parallel to each other, the polygonal meshes of which may have any shape, with straight or curvilinear sides, but are preferably triangular, one of the sides of each triangle being horizontal.
  • the flow of liquid through the exchange body takes place by film and by drops.
  • the film flow takes place along the non-horizontal edges of the meshes while the drops essentially fall from the non-vertical ridges on the lower edges or either they rebound, making a splash, either they mix with the film of these edges, film which they contribute to form.
  • a typical film runoff is revealed, for example, by patent BE 544596 (DE 1134689) (US 2836405).
  • a typical splash exchange body is disclosed, for example, by patent BE 199331, filed April 16, 1907 relating to a counter-current refrigerant, and by patent FR 470191, filed March 28, 1914, relating to a cross flow refrigerant.
  • Water falls from the upper edge of these grids mainly by streaming along the edges; drops detach from it under the effect of the air turbulence and fall on the lower edges of which they join the film.
  • the shape of the meshes of these known exchange bodies is diamond.
  • the trickle grid vertical in the service position, consists of polygonal meshes delimited by a network of intersecting edges. These include protrusions perpendicular to the plane of the grid at their junctions.
  • the object of the invention is to have a light exchange body, very perforated, so as to be practically non-clogable by water laden with suspended matter, having little pressure drop when air passes and having a large heat exchange efficiency.
  • trickling grids have low thermal efficiency, because the water flows mainly along the mesh edges of these grids, and possibly fall in drops too large to be very effective from the junctions of the edges.
  • the object of the invention is to considerably increase the quantity of drops of liquid in the openings of the meshes, and to better distribute the fall of water through the exchange body between a film runoff along the edges of the meshes. and a multitude of slow-falling, hampered droplets.
  • this object is achieved by the fact that the vertical protrusions extend in the plane of the grid, downwards from the crossings of the edges when the grid is in the vertical service position.
  • the mesh consists of two sets of oblique edges parallel to each other in each set, the oblique edges being provided with at least one protuberance situated in the plane of the grid and s' extending vertically on either side of the ridge.
  • the grid will be provided with horizontal edges and edges oblique, it will have no vertical edges except at its two lateral ends.
  • the liquid flows along the oblique edges of the grids and is partially collected by the protrusions along which it flows and then detaches from it in the form of drops.
  • the edges known as nodes, intersect
  • the very intersection of these edges promotes the collection of the liquid by the protuberances therein.
  • the protrusions along the oblique edges the collection of the liquid by these protrusions is favored by the part of the protuberance which projects above the edge, thus breaking the flow of the liquid along the edge.
  • the liquid falling from the protuberances is collected by the edges located below, either by the oblique edges similar to those from which it comes, or by horizontal edges which preferably have a horizontal upper face where the drops of liquid which fall bounce and burst.
  • the fall of the liquid is greatly slowed down and the direct contact between the liquid and the gas is markedly increased.
  • the protrusions have a prismatic section, preferably rectangular, with the faces respectively parallel and perpendicular to the plane of the grid, that is to say that they are in the form of a flat. They eventually end in a rounded part. Their thickness measured perpendicular to the plane of the grid is identical to that of the edges of the grid, measured similarly.
  • edges are preferably prismatic, of triangular section, with a vertical face.
  • the oblique edges are preferably of isosceles triangular section, the vertical face containing the bases of this triangle.
  • the horizontal edges are preferably of right triangular section, the vertical face containing one of the sides of the right angle, the other side of the right angle defining a horizontal face, the latter being the face upper part, on which the drops of liquid falling from the protrusions burst and rebound.
  • the meshes of the grid are polygonal and the polygons of the mesh are isosceles triangles whose base is horizontal when the grid is in service.
  • the grid could possibly consist of diamonds placed on their vertices or of hexagons one side of which is horizontal; but the materialization of the horizontal diagonals would practically not increase the pressure losses of the gas flow, while it would break the drop of the drops halfway up these polygons, increasing the efficiency of the heat exchange, these diagonals also being provided with protuberances.
  • the rhombus thus gave rise to the preceding triangle, an element of the mesh of the grid of the preferential exchange body.
  • hexagons provided with one of their diagonals they give two trapezoids, which constitutes a possible variant of the invention.
  • the base of the trapezoids being arranged horizontally, the obtuse angles of these trapezoids are advantageously provided with protuberances.
  • the grid of the grids consists of a set of horizontal edges (the grid being seen in service) and of two sets of oblique edges parallel to each other in each set and intersecting one set to another with the same obliquity with respect to the vertical, the horizontal edges passing immediately either under the lower levels or above the upper levels of the places where the oblique edges meet.
  • the effect sought by this arrangement is to create a relatively large area for crossing edges, called a node (crossing), which thus increases the rigidity of the grid and contributes to constituting the bearing surface of the bracing pieces.
  • the grids are preferably molded from injected plastic, for example polypropylene, polyethylene, polyvinyl chloride, etc.
  • the section of the mesh edges is any, for example triangular, while being favorable to demolding operations (presence of a draft).
  • these grids are reinforced on their peripheries by a frame, molded in one piece with the grid, which gives it a certain rigidity. Reinforced edges, vertical or horizontal, can also help increase the rigidity of the grid.
  • spacers placed between the successive grids.
  • spacers can for example contain nipples which pass through knots and get stuck in a blind hole of the previous interlayer opposite to a nipple.
  • the nipple bases are preferably positioned between nodes of two successive grids. Their length is calibrated to match the pitch of the grid assembly.
  • the nodes intended to receive these bases are preferably reinforced.
  • spacers may also contain clips in the form of a split bitt intended to be wedged in a corresponding female cavity, "counter-bitt", of the preceding interlayer, opposite a bitt of this interlayer.
  • These bittes cross the grids in places provided with vertical flats (grid in service position) preferably located between two nodes, thus crossing a horizontal edge. These flats have the thickness of the grid.
  • the rear of the bittes is provided with a shoulder which is applied to this flat area and which is provided, overhanging, with one (at the end bittes) or two (at the intermediate bittes) tongue-springs intended to catch up the clearance of the bit / counter-bit assembly, taking into account manufacturing and assembly tolerances.
  • connecting pieces are provided which overlap two grids contiguous over their entire height and are wedged against these grids by the spacers (spacers).
  • Fig. 1 shows a grid 10 consisting of a frame 1, a set of horizontal edges 2, a first set of oblique edges 3 parallel to one another and a second set of oblique edges 4 also parallel to each other .
  • edges 3 of the first set cross the edges 4 of the second set with the same obliquity with respect to the vertical.
  • the horizontal edges 2 pass immediately below the lower level of the crossing points of edges 3 and 4, so that the edges 2, 3 and 4 form a relatively large crossing surface, hereinafter called node 5.
  • Each node 5 has a vertical protuberance 6 placed in the plane of the grid 10 and extended under the lower edge of the node 5.
  • edges 2, 3 and 4 have the shape of an isosceles triangle 7.
  • each oblique edge 3 and 4 has a protuberance 9 situated in the plane of the grid and extending vertically on either side of the edge, but longer below the edge than above it.
  • Fig. 1 shows only the protrusions 9 of two meshes.
  • the frame 1 and some of the nodes 5 have orifices making it possible to assemble several grids in planes parallel to each other using spacers.
  • connecting pieces are used.
  • Fig. 2 shows the detail of a node 5 with the horizontal edges 2 and the oblique edges 3 and 4.
  • the protuberance 6 covers the whole of the crossing surface of the edges, it has a rounded shape 41 upwards and a rounded shape 42 down. Downward the protrusion exceeds the crossing surface and protrudes below the knot.
  • the thickness of the protrusion measured perpendicular to the plane of the grid is identical to that of the edges of the grid.
  • Fig. 3 shows the detail of a node 5 provided with an orifice for the passage of a stud 22.
  • the shape of the protuberance is slightly adapted in order to reinforce this part of the grid.
  • the protuberance always carries a projection 42 downwards.
  • the thickness of the node 5 always remains identical to the thickness of the grid.
  • Fig. 4 represents a section of the horizontal edge 2 (of FIG. 3).
  • Fig. 4 shows the right triangular section of the edge with one of the sides of the right angle which forms the vertical face 61 and the other side of the right angle which forms the horizontal face 62. This face 62 constitutes the upper face of the edge.
  • Fig. 5 shows a section through the oblique edge 4 (of FIG. 3).
  • Fig. 5 shows the isosceles triangular section of the edge, the face forming the base of the triangle being the vertical face 71.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Meat, Egg Or Seafood Products (AREA)
  • Nozzles (AREA)
EP89870060A 1988-04-29 1989-04-26 Grille de ruisellement à protubérances Expired - Lifetime EP0341232B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89870060T ATE72483T1 (de) 1988-04-29 1989-04-26 Rieselgitter mit protuberanzen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1618/88 1988-04-29
CH1618/88A CH677024A5 (enrdf_load_stackoverflow) 1988-04-29 1988-04-29

Publications (2)

Publication Number Publication Date
EP0341232A1 EP0341232A1 (fr) 1989-11-08
EP0341232B1 true EP0341232B1 (fr) 1992-02-05

Family

ID=4214645

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89870060A Expired - Lifetime EP0341232B1 (fr) 1988-04-29 1989-04-26 Grille de ruisellement à protubérances

Country Status (5)

Country Link
EP (1) EP0341232B1 (enrdf_load_stackoverflow)
AT (1) ATE72483T1 (enrdf_load_stackoverflow)
CH (1) CH677024A5 (enrdf_load_stackoverflow)
DE (1) DE68900808D1 (enrdf_load_stackoverflow)
ES (1) ES2029138T3 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19733480C2 (de) * 1997-08-01 1999-06-24 Gea Kuehlturmbau Gmbh Einbaupackung zum Stoff- und/oder Wärmeaustausch zwischen Gasen und Flüssigkeiten
JP2001327859A (ja) * 2000-05-19 2001-11-27 Tadayoshi Nagaoka 物質移動等を行う装置内の充填体等の立体網状構造物およびその製造方法
US11293705B2 (en) * 2018-11-21 2022-04-05 Brentwood Industries, Inc. Open mesh members and related fill packs

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1388886A (fr) * 1963-12-30 1965-02-12 Balcke Ag Maschbau élément combiné de construction pour refroidisseur par évaporation
US3346246A (en) * 1965-01-25 1967-10-10 Marley Co Cooling tower fill assembly of foraminous sheet material
GB1285495A (en) * 1970-11-03 1972-08-16 Bischoff Gasreinigung Packing for incorporation in a cooling tower of a cooling water circulation system
US4728468A (en) * 1986-07-18 1988-03-01 Duke Eddie D Fluid contact plate

Also Published As

Publication number Publication date
CH677024A5 (enrdf_load_stackoverflow) 1991-03-28
DE68900808D1 (de) 1992-03-19
EP0341232A1 (fr) 1989-11-08
ES2029138T3 (es) 1992-07-16
ATE72483T1 (de) 1992-02-15

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