Gas and liquid contact apparatus – Contact devices – Rotating gases
Patent
1990-09-28
1992-10-27
Miles, Tim
Gas and liquid contact apparatus
Contact devices
Rotating gases
261DIG72, 261 94, B01F 304
Patent
active
051587122
DESCRIPTION:
BRIEF SUMMARY
The invention relates to regular packings used as furniture elements in thermal separating facilities, for example, in rectification, extraction and sorption and also in mixing technology.
The invention relates more particularly to packings of this kind in which uniform fan-like vane elements are distributed over their physical dimensions. Elements of this kind are disclosed in DE-OS 3 515 300 A1 corresponding to U.S. Pat. No. 4,830,792 and PCT W086/06296. Elements of this kind are of use in column apparatuses and channels to enhance cross-distribution and cross-mixing of the flowing phases which contact one another in chemical and thermal separating and mixing processes. The advantageous use of so-called angle packings containing the fan-like vane elements referred to leads, for example, in thermal separation technology, to a greater dissociative effect in mass transfer processes than can be provided by other packings.
However, it is precisely as regards the separating efficiency of angle packings that the sequence in which fan-like vane elements are disposed in a packing is important. The packing structure defined with reference to FIGS. 5-7 of DE-OS 3 515 300 A1 provides helical paths for phase subflows, with the possibility of adjacent subflows of the same phase rotating to opposite hands. The packing described in the latter publication is highly effective at separation. However, production and assembly costs of such a packing are greater than for other comparable products since it seems very likely that the packing can be built up only in layers layered perpendicularly to the main flow axis. Other kinds of packing, for example, those produced by the Sulzer company and the Montz company, described by R. Billet in Energieeinsparung bei thermischen Stofftrennverfahren, ISBN 3-7785-0912-8 use zig-zag folded sheets, known as pleated mats, which can be introduced into columns with their axes parallel as furniture elements, the fold edges of the sheet metal parts used for the packing usually being askew of the column axis. As regards the packing described in both the publications DE-OS 3 515 300 A1 and PCT W086/06926 with fan-like vane elements, versions are described in which the packing can be built up on a basis of pleated mats.
Reference should be made on this point more particularly to the embodiment illustrated in FIG. 12 of the PCT application W086/06296. As compared with the packing shown in FIGS. 5 to 7 of DE-OS 3 515 300 A1, the zig-zag folding of the sheet metal parts leads to straight triangular channels which are formed with lateral orifices but which form preferred straight flow paths more particularly for the lighter phase--i.e., as a rule for vapor or gas. In this embodiment, the fan-like vane elements act predominantly on the descending flow of liquid phase whose flow velocity as referred to the free column cross-section is much below that of the lighter phase.
The advantage of lower-cost packing production in the case of the embodiment of FIG. 12 of PCT application W086/06296 is offset by a disadvantage, viz. that as the gas or vapor loading increases there is an increased flow of the lighter phase through the straight channels, with a reduction of the required cross-mixing more particularly in the vapor or gas.
The flush channels formed by the pleatings provide for a gas or vapor flow in the case of a packing block preferred directions which could be projected, for example, in the form of parallel straight lines on a cross-sectional plane of the flow channel or of the column surrounding the packing. From the point of view of adequate cross-mixing in the lighter phase, however, a uniform distribution of the velocity components over the projection cross-section would be desirable.
To obviate this disadvantage arising from simplified packing production, the problem is to find--while retaining fan-like vane elements which have proved very effective at least for the uniform distribution of descending liquid over the cross-section--a packing structure which can also be produced economically from
REFERENCES:
patent: 3010706 (1961-11-01), McWilliams
patent: 3295840 (1967-01-01), Donald
patent: 4022596 (1977-05-01), Pedersen
patent: 4107241 (1978-08-01), Braun
patent: 4497753 (1985-02-01), Streiff
patent: 4501707 (1985-02-01), Buhlmann
patent: 4830792 (1989-05-01), Wilhelm
WO86/06296, Nov. 1986, Wilhelm, 261.
Hand Francis C.
Miles Tim
Sulzer Brothers Limited
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