Liquid purification or separation – Diverse distinct separators – Including a filter
Patent
1983-12-21
1985-11-05
Fisher, Richard V.
Liquid purification or separation
Diverse distinct separators
Including a filter
210307, 210313, 210422, 2105121, B01D 3524
Patent
active
045512477
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a device for separating solid particles of dirt from cooling water for power stations and the like, consisting of a screening drum disposed statically in a cylindrical casing so as to form an annular chamber, for axial introduction of the helically incoming cooling water, a cooling water outlet spigot secured tangentially to the cylindrical housing, and a dirt particle discharge spigot connected to the interior of the drum and provided with a valve.
Large quantities of cooling water are required to cool heat exchangers in steam power plants or other power stations, and solid particles, such as pieces of wood, plastics, leaves, grass, mussels, etc. have to be removed in order to avoid any damage and clogging of the power station components. While coarse particles of dirt of this kind can be retained by means of rakes, the devices used for separating smaller particles are of the type in which the cooling water flows through a screening drum secured in a cylindrical casing.
In a known construction of this kind the cooling water is helically accelerated and introduced axially into the screening drum by turbulence means, e.g. valves or an ante-chamber to which the flow is introduced tangentially. While the particles of dirt are retained in the screening drum, the cooling water flows outwardly through the drum into an annular chamber, from which it flows out via a tangential outflow spigot. The particles of dirt accumulating in the drum are flushed out at certain intervals, a discharge spigot connected to the drum interior being opened for a brief period by a valve. For a separator device of this kind to operate satisfactorily, the cooling water must approach the inner surface of the screening drum at an acute angle so that the particles of dirt are washed into the central sink from the surface by the tangential forces, and the screen perforations must not clog. In practice, however, it is a disadvantage that particles of dirt cover or clog the screening drum in the region of the outflow orifice to a greater extent than in the other peripheral zones. This partial clogging or covering of the screening surface not only results in a considerable reduction in performance, but also necessitates more frequent washing out of the drum.
In contrast, the object of the invention is so to construct the device as to greatly improve performance and prevent any deposition of or clogging by particles of dirt in the region of the outflow orifice.
To this end, according to the invention, a baffle is disposed in the annular chamber in front of the cooling water outflow orifice, said baffle bearing coaxially by one edge against the outer surface of the drum and extending over a part of the periphery of the drum with an increasing distance from said drum as considered in the direction of flow.
The basic advantage of providing the baffle in the annular chamber is that the pressure difference between the outflow orifice and the drum interior is distributed uniformly over the entire periphery of the drum and no longer acts preferentially on the drum surface situated opposite the outflow orifice. The result is a uniform rotary flow, thus preventing direct outflow of the cooling water through the drum into the outflow orifice.
The baffle construction and arrangement may vary according to operating and flow conditions, and it may extend over approximately one-third to two-thirds of the drum periphery; preferably, it extends over approximately half the drum periphery. To obtain particularly favorable flow conditions and high efficiency, the angle between the baffle and the outer surface of the drum is advantageously approximately equivalent to the angle of approach of the cooling water to the inner surface of the drum.
The favorable distribution of the pressure can be further optimized by disposing the drum eccentrically in the cylindrical housing, the minimum radial distance between the two parts being on that side where the free edge of the baffle is situated.
One exemplified embodiment of the invention is illus
REFERENCES:
patent: 1571736 (1926-02-01), Reed et al.
patent: 2226045 (1940-12-01), Baldwin
patent: 2902156 (1959-09-01), Dahlberg
patent: 2913114 (1959-11-01), Plaven
patent: 2998137 (1961-08-01), Vane
patent: 3067876 (1962-12-01), Hruby, Jr.
patent: 3088595 (1963-05-01), Robb
patent: 3771290 (1973-11-01), Stethem
patent: 3985522 (1976-10-01), Kuhlmann
patent: 4017390 (1977-04-01), Vicard
patent: 4199443 (1980-04-01), Tauber
patent: 4276171 (1981-06-01), Jackson
patent: 4287055 (1981-09-01), Holz
patent: 4318805 (1982-03-01), LeBlanc
patent: 4366056 (1982-12-01), Jackson
Borchert Werner
Nitsch Klaus D.
Dubno Herbert
Fisher Richard V.
Millard Wanda L.
Ross Karl F.
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