Fluid sprinkling – spraying – and diffusing – Combining of separately supplied fluids – Fluid streams have angular junction
Patent
1995-03-14
1997-05-13
Morris, Lesley D.
Fluid sprinkling, spraying, and diffusing
Combining of separately supplied fluids
Fluid streams have angular junction
239568, 2395905, 261 782, B05B 704, B05B 114
Patent
active
056284608
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for spraying a liquid and, more particularly, to such a linear device designed for the linear spraying of a cooling liquid onto hot objects such as blooms obtained at the exit of a rolling mill or a continuous casting unit in the iron and steel industry.
A need has been expressed in this industry for linear cooling-water spray units arranged perpendicular to the direction of advance of the bloom and parallel to the faces of the latter so as to spray them with this water. It has also been indicated that said linear spray units should each be able to cover the largest possible area so as thus to limit the number of them and the associated maintenance problems, such as the upkeep of a plumbing system whose complexity increases with the number of spray units to be fed, and to simplify the control of the flow rates by limiting the number of valves.
It is possible to imagine forming such a spray unit with a set of aligned cylindrical tubes fed with cooling water. It is known that the angle of spread of the water thus sprayed at the outlet of the tube is a function of the geometry of the nozzles placed at the end of the tubes; this leads to a cooling uniformity which is deemed to be insufficient in the application mentioned.
It is also possible to imagine using linear spray units with slits, such as the one described in the International Patent Application WO 89/10203 filed in the name of the Applicant Company. With very thin slits, for example of the order of 0.2 mm, and with very smooth walls, an angle of spread of approximately 90.degree. is achieved, which would be satisfactory in the application envisaged hereinabove. Unfortunately, in iron- and steel-making, the use of a spray unit with a slit of 0.2 mm in width cannot be envisaged because of the quality of the water used, this being laden with hard particles which would rapidly clog such a slit. The minimum admissible slit width is 1 mm and, with such a slit width, the angle of spread of the sprayed water is only 30.degree. approximately, this being insufficient to satisfy the condition mentioned hereinabove of covering a large area.
Furthermore, it is desirable to be able to vary the flow rate of sprayed water over a wide range of flow rates. With the known spray units or atomizers, the variation ratio reaches 3 or 4 at the most, whereas a ratio greater than 10 would be desirable in iron- and steel-making so that identical, and therefore interchangeable, spray units could be used at various points requiring cooling with different intensities, these being adjusted by controlling the water flow rate of the spray units.
The object of the present invention is therefore to produce a device for linear spraying of a liquid, especially a cooling liquid, which makes it possible to achieve wide spray angles without having recourse to spray slits with a width less than one millimeter.
The object of the present invention is also to produce such a spray device having a large variation ratio, typically greater than 10, of the flow rate of liquid sprayed.
These objects of the invention, together with others which will appear on reading the following description, are achieved with a device for linear spraying of a liquid, especially a cooling liquid, of the type which comprises means, arranged in a chamber, for supplying the liquid to an elongate spray nozzle formed in the wall of the chamber and means for injecting a gas into this chamber in order to spray the liquid supplied to the nozzle and to carry it away out of the chamber. According to the invention, the device comprises an elongate component arranged in the chamber so as to be sprayed by the liquid leaving the means for supplying the liquid, which will then spread out over a convex surface of this component in order to be carried away by the gas and to flow out towards two elongate slits adjacent to the nozzle and converging in the latter, the width of the slits varying periodically and complementarily along their length so as to delimit two sheets of the liquid/gas mixt
REFERENCES:
patent: 4903895 (1990-02-01), Mathewson et al.
patent: 5012980 (1991-05-01), Viannay et al.
patent: 5118041 (1992-06-01), Chastang et al.
Chastang Georges
Chiron Michel M. J.
Bertin & Cie
Morris Lesley D.
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