DE1269144B - Plate heat exchanger - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

Number:
File number:
Registration date:
Display day:

F28d

German KL: 17 F-5/30

1269 144
P 12 69 144.0-13
April 28, 1964
May 30, 1968

The invention relates to a plate heat exchanger with at least one passage for a fluid, which is present at the same time in the liquid and vapor phase, with a distribution space for the vapor phase Phase in front of the inlet opening of the through-channel and one perpendicular to the plates in the distribution space arranged spray tube, which has spray openings for the passage of the liquid phase.

Such a heat exchanger is known from German patent specification 889 136. After this Patent specification are a plurality of plates corresponding to a plurality of parallel through channels created the usual structure of a plate heat exchanger. Due to the arrangement of the spray tube and of the spray openings according to this patent specification is already a certain, to the extent in the patent specification Uniform distribution of the liquid phase to the individual through-channels, which was not discussed, was achieved. As. The disadvantage here, however, remains that within the individual through-channel, due to the Randomness of the flow conditions for the gaseous phase in the distribution space and the randomness the distribution in the spray cones of the liquid phase, no uniform distribution for both phases is achieved across the cross-section of the through-channel; certainly not an about over the cross-section of the individual through-channel constant ratio of the proportions liquid and gaseous phase guaranteed.

The invention is based on the object of eliminating these disadvantages of the known design and to achieve the most uniform possible distribution of the liquid phase over the cross-section of the through-channel.

This object is achieved according to the invention in that a known per se in the through channel Ribbed insert is arranged through which at least the entry section of the through channel is divided into several separate sub-channels, and that the spray openings in such a way on the spray tube are distributed over a circumferential area lying in a radial plane that their center lines in meet evenly distributed on the inlet openings of the sub-channels.

A plate heat exchanger is also known from US Pat. No. 2439 208, in which Passage channels are arranged through which the passage channel in several separate sub-channels is divided. In this known heat exchanger is close to Ribs in length promote mixing and even distribution over the sub-channels, Plate heat exchanger

Applicant:

Societe Trane, Golbey (France)

Representative:

Dr. H. H. Willrath and Dr. D. Weber,

Patent Attorneys, 6200 Wiesbaden, Hildastr. 18th

Named as inventor:

William H. Stahlhub, LaCrosse, Wis. (V. St. A.)

Claimed priority:

V. St. v. America April 29, 1963 (276 441)

Openwork disc running transversely to the direction of flow is placed upstream of the rib inlays. The even distribution of both that can be achieved by the plate heat exchanger according to the invention Phases over the cross-section of the entire through-channel can, however, be used with this known Heat exchanger also does not achieve.

An embodiment of the plate heat exchanger according to the invention, in which the rib insert occupies only part of the cross-section of the through-channel, is characterized by the fact that this Ribbed insert is connected to a widening insert, the partial channels of which are on the one hand the partial channels of the rib insert continue, on the other hand open onto the substantially entire cross-section of the through-channel.

A particularly good mixing can be achieved with a further advantageous embodiment of the invention achieve, which consists in the fact that the widening insert extends over the whole Cross-section of the through-channel extending intermixing insert, which is made transversely to There is openwork ribs running in the direction of flow.

The plate heat exchanger according to the invention is particularly advantageous in systems for gas separation usable through low temperatures. The invention therefore relates to the use of the plate heat exchanger in such systems.

The invention is explained in more detail, for example, using the figures. It shows

Fig. 1 is a section through a single Durohgangskanal of the plate heat according to the invention

809 557 / S03

exchanger, whereby this channel is in connection with the distribution chamber,

F i g. Figure 2 is an oblique view of part of that used in the passage channels of the heat exchanger Rib material,

3 shows an oblique view of a part of a used in the through channels, with openings provided rib material,

F i g. 4 is an enlarged view of a portion of the spray tube; and FIG. 5 shows a section along the line V-V in FIG. 4th

On the upper side of the core next to the collector 74 of the heat exchanger according to the invention is a distribution space 80 intended. Each through-channel 78 has an inlet for the Heat exchange fluid. The fluid entering the inlet flows down through one of a corrugated Sheet metal - 28 existing, uninterrupted, with the wave crests in the main flow direction running, essentially triangular rib insert 84. That of the two lower ones Fluid exiting the sides of the triangular rib insert 84 is made diagonally across the entire width of the through-channel 78 by widening inserts 86 extending rib material 30 'distributed. Such a trapezoidal insert is on each one Side of the triangular rib insert 84 already mentioned above is provided. Below the trapezoidal Widening inserts 86 there is a rectangular intermixing insert 88 made of openwork, transverse rib material 30. The one coming from the trapezoidal widening inserts 86 Fluid must pass through the liner 88 in a direction perpendicular to the webs 16 of the fin material 30 flow through it. Since the rib material 30 is provided with openings 31, the 10 to 20% of its make up the entire surface area, is the flow resistance for the fluid in the main flow direction larger than across it.

The effect of the mixing insert 88 consists in a more even distribution of the fluid that comes from the widening insert 86. After thorough distribution over the entire width of the passageway, the heat exchange fluid flows through a central insert 90 of perforated, longitudinally extending rib material 30 ", from where the fluid flows into a trapezoidal section of perforated, diagonal rib material 30 '", in which the fluid flows one side of the through-channel 78 is deflected and fed to the outlet 92 via a substantially triangular-shaped, uninterrupted, longitudinally extending rib insert 94. The collector 96 collects the heat exchange fluid exiting the outlet 92 and supplies it to the outlet conduit 98. The heat exchange fluid is passed within each passage 78 through side and end rods 38 which are provided between the mutually spaced plates 18 on their peripheral edges.

Attention is drawn to the transverse vertical space 80, which is above the inlet openings 82 of the sub-channels formed by the rib webs 16 of the corrugated metal sheet 28 is attached. The distribution space 80 has a semicircular cross section, the ends of which are closed. Of the On the convex side, an inlet line 100 for gaseous gas extends at both ends of this collector Fluid up. The inlet lines 100 and the rest, partly for other channels of the heat exchanger The lines 98, 24 and 36 used are provided with reinforcing pins 102.

A spray tube 104 runs through the distribution space 80 and through its ends. This spray tube 104 extends over all the inlets of the through channels 78. A series of eight radial, substantially round spray orifice 106 (see Figure 4) is above each inlet in the spray tube intended. The spray tube 104 is used to evenly distribute the liquid phase on the Passage channels 78 and within these channels practically independent of the flow rate of the vapor phase in the inlets of the passageways 78.

In order to achieve an even distribution of the liquid phase at the inlet, however, it has been found that the distance between the radially extending bores 106 must be unequal. For this Basically, it should be pointed out that the holes at the ends of each row are closer to one another than the openings in the middle of the row. With this one described spray tube, the angular distance between the individual holes in each row is 9.5, 14, 19.5, 22, 19.5, 14 and 9.5 °, as shown in FIG. 5 of the drawing. The center lines of the substantially circular Spray openings of each row extend radially from the spray tube 104 through the surface the inlet of the respective through-channel 78 at points evenly distributed over this inlet. With this particular distance between the individual spray openings from one another has in practice a let achieve completely uniform distribution of the liquid phase on the sub-channels. The rib inlay 84 and possibly the widening insert 86 keep this uniform distribution over the entire width each through channel 78 upright. The mixing liner 88 completes the distribution both the liquid and the vapor phase before entering the central part of the Heat exchanger.

Claims (4)

Patent claims: 1. Plate heat exchanger with at least one passage for a fluid that is also in . liquid and vapor phase is present, with "a free space for the vapor phase in front of the inlet opening of the through-channel and one perpendicular to the plates in the storage room arranged spray tube, which spray openings for the passage of the liquid phase has, characterized in that a known per se in the through channel (78) Ribbed insert (84) is arranged through which at least the inlet section of the through channel is divided into several separate sub-channels, and that the spray openings (106) in this way on the spray tube (104) over a circumferential area lying in a radial plane are distributed so that their center lines are evenly distributed over the inlet openings (82) of the sub-channels meet. 2. Plate heat exchanger according to claim 1, wherein the rib insert only part of the cross section of the passage channel, characterized in that this rib insert (84) is followed by a widening insert (86), whose sub-channels continue on the one hand the sub-channels of the rib insert, on the other hand to the im open out substantially the entire cross-section of the through-channel. 3. Plate heat exchanger according to claim 2, characterized in that the widening insert (86) extends over the entire cross section of the through-channel extending intermixing insert (88), which is made of transverse to There is openwork ribs running in the direction of flow. 4. Plate heat exchanger according to one of claims 1 to 3, characterized by its use in systems for gas separation through low temperatures. Considered publications:
German Patent No. 889 136;
U.S. Patent No. 2,439,208;
Chemie-Ingenieur-Technik, March 1954, p. 137; Progress in Cryogenics, London 1961, Vol. 3, pp. 43 and 44. 1 sheet of drawings