Fluid sprinkling – spraying – and diffusing – Flow deflecting or rotation controlling means – Deflector and terminal flow element
Patent
1995-06-06
1998-04-28
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Flow deflecting or rotation controlling means
Deflector and terminal flow element
239523, 134 82, B05B 126
Patent
active
057434697
DESCRIPTION:
BRIEF SUMMARY
For the purpose of cleaning the flue gases of refuse incineration plants or power plants from harmful substances such as, for example sulphur dioxide, it is known to spray a lime milk suspension into the flue gases.
It is known for said purpose to use for the spraying of the lime milk a spirally wound guide duct with a rectangular cross section, which duct becomes narrower toward the outlet in order to admit the lime milk suspension into the flue gases by way of said guide duct.
Apart from the fact that the spraying effect is unsatisfactory with said device, and that the latter is susceptible to trouble because not all flue gases are contacted by the spray mist, so that parts of the flue gases are discharged into the atmosphere without having been contacted by the lime milk suspension, there exists the risk that said device for the lime milk suspension becomes clogged after only a short time.
Furthermore, a demixing of the lime milk suspension occurs within said known device because of the differences in density between the lime and the water, with the consequence of a poorer cleaning result.
Also, a gas purifier is known (European patent application 118 017) in which the flue gases pass via a feed conduit into a treatment space, where the gases are subjected to the introduction of a cleaning liquid contained in a bath. For said purpose, the liquid is atomized by means of a rotating arrangement of disks, whereby the cleaning liquid is continuously admitted to the disks preferably via a hollow shaft, and said cleaning liquid is then torn from the rotating disks by centrigugal forces, with formation of annular spray zones.
Finest atomization of the lime milk, by which the flue gases are acted upon as intensively as possible, cannot be accomplished with such a gas purifier. Furthermore, demixing effects occur in this case as well.
A venturi washer for removing sulphur dioxide from a stream of gas is known from DE-A 21 53 593. Such a device required much construction expenditure and, furthermore, cannot be directly installed in a flue gas washer; the flue gas washer rather has to be rebuilt to conform to the shape of the Venturi washer, which is the reason for which this technology has not been successful.
A rotation atomizer is known from GB-A 21 49 685, with which the flue gas in a flue gas desulphurization plant is cleaned by spraying a lime milk suspension as well. This rotation atomizer, too, is characterized by a costly and wear-afflicted construction, which is particularly susceptible to clogging if the lime milk suspension contains solids clogging the atomizer.
Therefore, the invention is based on the problem of creating a spraying device which is characterized by a simple and reasonably priced structure; which operates with little maintenance and without clogging; and by which, furthermore, it is assured that the lime milk suspension is sprayed in such a way that all flue gases come into contact with said suspension, which means no parts of flue gas not contacted by the lime milk suspension can be discharged into the outside.
According to the invention, the spraying device for cleaning the flue gases by spraying a lime milk suspension is characterized by a feed tube for the lime milk suspension, whereby a conical jacket with a plane conical surface is associated with the feed tube in the direction of flow of the suspension to be distributed, whereby the conical jacket is arranged on the feed tube by means of a holding device, whereby the conical tip is aligned in the direction on the feed tube, whereby the conical tip of the conical jacket has a spacing from the outlet opening of the feed tube, whereby the spacing of the conical tip from the outlet opening is dimensioned the smaller the diameter the smaller the outlet opening which is selected. In this connection, preferably the edge zone of the conical jacket is angled toward the center axis of the cone, i.e., a transition from the cone to a conical frustum takes place here in order to produce a uniformised flow by such tearing edge.
In this connecti
REFERENCES:
patent: 2704174 (1955-03-01), Uxa
patent: 3245474 (1966-04-01), Romero
patent: 5516047 (1996-05-01), Kubach et al.
Douglas Lisa Ann
Kashnikow Andres
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