Gas and liquid contact apparatus – Contact devices – Liquid tank
Patent
1986-08-11
1988-05-10
Miles, Tim
Gas and liquid contact apparatus
Contact devices
Liquid tank
261DIG75, B01F 304
Patent
active
047434082
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for continuously introducing a gas, in particular air, into a liquid, in particular water, for water activation and purification, flotation, deinking units or the like, comprising a liquid nozzle, one or more gas discharge openings downstream of the nozzle including the respective feed conduits, and a diffuser downstream of the gas discharge openings.
German laid-open application (DE-OS) No. 30 15 788 discloses, in a flotation apparatus, a gasification device of the kind set forth above. The actual device comprises a substantially parallelepipedic housing having a flat nozzle, a row of air feed openings and a flat diffuser with boundary surfaces which are flat in themselves. A plurality of gasification devices are used for a respective flotation apparatus, wherein a swirl effect is imparted to the liquid of the flotation chamber which is circular in cross-section, by virtue of inclined positioning of the gasification devices. The flat nozzle form was used primarily in order to counteract clogging due to fibre materials and the like, which has been observed hitherto in relation to round nozzles.
It has been found in practice however that the desired improvement in the form of a reduced risk of clogging is not achieved. More specifically, if clogging occurs adjacent a lateral boundary wall, an impenetrable plug is very quickly formed, extending as far as that wall, and that plug can no longer be automatically flushed away in the course of further operation. Instead, the flat nozzle slowly becomes closed and loses its advantageous operating conditions as for example the diffuser is too wide for the passage which is then still free, in the region of the liquid nozzle. Another major disadvantage of the known gasification devices however lies in the fact that they are relatively expensive to produce. The flat bodies which are required for the device must be produced to close tolerances on planing and grinding machines which experience has shown are less economical than for example shaping components by turning, as each cutting stroke movement involves an idle return movement.
Accordingly the problem of the present invention is so to improve a gasification device of the kind set forth in the opening part of this specification, that clogging is substantially avoided on the basis of the particular liquid nozzle, inexpensive manufacture is possible and the relatively complicated individual supply of a plurality of gasification devices is no longer necessary.
To solve that problem, the invention proposes that the liquid nozzle is in the form of a substantially circular annular gap with a horizontally extending central plane and the gas discharge openings are in the form of circular openings of a respective air chamber, which openings open above and below the annular gap, and that the diffuser comprises two mutually oppositely disposed boundary surfaces at respective sides of the liquid which issues from the annular gap and the mutual spacing of which, over a flow path from the interior outwardly, having regard to the increase in width due to the increasing peripheral area with increasing diameter, is so selected that the overall enlargement corresponds to that of a diffuser which is circular in cross-section, with an aperture angle of 2.degree. to 6.degree..
The device according to the invention is thus provided with an endless annular nozzle in which there are no side boundary means in the form of a terminal wall or the like. Therefore, after an initially slight blockage at any point in the annular gap, there is no possibility of a bridge being formed to a stationary portion, which bridge can then no longer be eliminated by the running flow. On the contrary, the device according to the invention can provide that a blockage is broken up again immediately before it results in the flow conditions being perceptibly adversely affected. The device is produced by the assembly of turned components which are generally particularly economical and which can even be produced on automatic machin
REFERENCES:
patent: 3946948 (1976-03-01), Horlin
patent: 4044079 (1977-08-01), Tveit
patent: 4282172 (1981-08-01), McKnight
Great Britain Water Pollution Research Board, 1959 Report, pp. 94-98, 261--Dig. 75.
Berns et al. Kansas State University Bulletin, vol. 46, No. 5, May 1962, Special Report 20, 261--Dig. 78.
C.R.C. Standard Mathematical Tables, Tenth Ed., pp. 342, 92, Cpr. 1955, Copy with Ex.
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