Cleaning and liquid contact with solids – Apparatus – Sequential work treating receptacles or stations with means...
Patent
1988-06-29
1990-05-29
Coe, Philip R.
Cleaning and liquid contact with solids
Apparatus
Sequential work treating receptacles or stations with means...
134122R, B08B 302, B08B 304, B08B 704
Patent
active
049287176
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE lNVENTlON
The invention relates to an equipment for surface treatment of continuously running strips particularly pickling equipment wherein the strip runs longitudinally through a horizontally arranged treatment channel which channel is arranged within a container enveloping the treatment channel and being closed by a lid; the treatment medium can be passed into the container, to and from the treatment channel.
Treatment equipment configured in such a manner are known under the name "Flat Pickling Systems" and today they are widely used. They have to a considerable extent replaced the earlier systems for "deep pickling". The treatment technique of continuously running strips could be improved considerably by means of flat pickling systems or horizontal pickling systems as compared with earlier technique since different concentration levels can be obtained in a better manner, the strip could be heated faster and an exchange of medium in the boundary phase between strip and treatment liquid could be activated. Also, ecological and economical advantages could be registered through reduction of the waste gas which is generated and through reducing the required thermal energy as well as through reduction of the flush water demand.
DESCRIPTION OF THE INVENTION
It is an object of the present invention to optimize known strip treatment equipment, particularly pickling equipment of the type referred to above, in order to shorten further the pickling process time and in order to improve the pickling quality of the stock being treated. For attaining this object equipment is suggested in accordance with the present invention which is characterized in that the treatment channel is bounded by the bottom of the container, by treatment channel side walls and by an intermediate cover, on all four sides; that run off troughs are formed between the side walls and the container inner walls which channels may receive simultaneously treatment medium being sprayed at the inlet and outlet side of the channel ends and through central openings provided in the side walls; and that the run off troughs are connected to a collecting chamber through which the treatment medium can be fed to a separately provided storage container.
The conception for the equipment underlying the invention has the advantage that a very low liquid level is used in the treatment channel. This makes sure that a better exchange of liquid obtains in the boundary phase strip/medium even without turbulence. If the treatment medium is sprayed in by nozzles at the inlet as well as the outlet side for the strip then in connection with the geometry and under support of lateral nozzles additional turbulence of the treatment medium obtains. The phase between the treatment medium and strip provides a better thermal transition between acid and strip and provides. therefore, for a better pickling effect. Thus the pickling period of time can be reduced and the throughput of the pickling can be improved.
The suggested device is also of advantage from the point of view of ecology and economy because owing to the advantages flowing from a turbulent flow one can run the equipment at a low pickling bath temperatures and energy can be saved accordingly. The lower temperatures and reduced energy consumption also reduces evaporation and gas formation so that emission into air is reduced. Also, waste water emission is reduced and because loading the waster water of the equipment is reduced owing to greater purity and smaller surface roughness of the strip.
The arrangement of the device and the utilization of an intermediate cover on the container lid permits rapid opening of the equipment in case of interference and easy access to the strip.
In accordance with a favorable feature of the invention it is suggested that on the inlet side, one set of nozzles (nozzle bar) is provided and two such sets (nozzle bars) are provided at the outlet side through which the treatment medium is sprayed at a shallow angle in relation to the strip whereby the sprayed treatment
REFERENCES:
patent: 2418386 (1947-04-01), Wood
patent: 3681949 (1972-08-01), Fleissner
patent: 4270317 (1981-06-01), Kurie
patent: 4592784 (1986-06-01), Ghizzi
patent: 4647173 (1987-01-01), Schar
Osarek Werner
Pempera Franz G.
Schonert Dieter
Coe Philip R.
Mannesmann AG
Siegemund Ralf H.
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