Gas separation: processes – Filtering – With cleaning of filter
Patent
1993-05-03
1995-02-14
Spitzer, Robert
Gas separation: processes
Filtering
With cleaning of filter
55230, 55242, 55280, 55440, B01D 4518
Patent
active
053891279
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase application corresponding to PCTEP91/02348 filed Dec. 7, 1991 and based in turn, upon an application filed in Germany as P 40 41 165.6 filed Dec. 21, 1990 under the International Convention.
FIELD OF THE INVENTION
This invention relates to a method for cleaning a drop separator and to a cleaning device carrying out the method.
Downstream of any gas scrubber generally a drop separator is provided in a first scrubber of a two-stage gas scrubbing installation, e.g. for the cleaning of flue gas, with a first scrubber for the removal of dust and optionally of HCl and a second scrubber for SO.sub.2 removal.
A drop separator has plates, called separator plates or blades extending over the entire cross section of a gas channel, e.g. a flue gas channel and which are arranged parallelly to each other and curved in the flow direction of the flue gas. The arrangement of the blades is known for instance from "Perry's Chemical Engineering Handbook, Sixth Edition, FIGS. 18-110 (b)", or from the publication "Hochwirksame Tropfenabscheider bei der Rauchgasreinigung (Sonderdruck aus Heft 1/83 Chemische Industrie)". The drops contained in the gas or separated at the blades run down on the blades acting as baffle surfaces. The problem with such drop separators are the deposits forming on the blades, which tend to clog the drop separator.
In order to clean the drop separator it is known from the above-mentioned publication to provide the drop separator with a cleaning device equipped with stationary nozzles installed in the gas channel. The nozzles arranged before and optionally also after the blades in the flow direction of the gas are fully conical nozzles, whose cone covers the entire cross section of the gas channel (compare with FIG. 4). The cleaning during which the blades are sprayed and rinsed with cleaning water jets corresponding to the conical shape of the nozzle takes place at intervals.
Particularly in the case of flue gases with a high proportion of fly ash, such as, for instance, downstream from an older electrofilter, the cleaning performed by this nozzle arrangement is not satisfactory. The drop separator clogs easily which results in frequent standstills, while the deposits are removed, for instance, by water under high pressure or by compressed air. In the worst cases the drop separator has to be replaced.
An essential drawback of the cleaning methods using stationary conical nozzles consists in the fact that the separator plates are not evenly hit by the cleaning jets. Blind spots are formed from which the clogging of the drop separator starts.
OBJECTS OF THE INVENTION
It is the object of the invention to develop a method for cleaning a drop separator which obtains an improved cleaning efficiency. The other object of the invention is to provide a drop separator capable of carrying out the method according to the invention.
SUMMARY OF THE INVENTION
According to the method of the invention the mutually parallel blades, curved in the direction of the gas flow are cleaned by moving flat cleaning jets over the blades transversely to the longitudinal extent of the blades.
The blades are swept by the cleaning jets with the same force and at the same angle. In opposition thereto the force of a conical, stationary jet decreases from the center of the jet outwardly. As a result the various blades hit by one jet are swept with variable force and at variable angles, which leads to the already mentioned blind spots. Therefore an important advantage of the method is the fact that the blind spots, i.e. areas which are hit by the cleaning jets only slightly or not at all, can be avoided to the largest extent.
Besides, fewer nozzles are required. Also the water amount required per nozzle is lower when compared to the water amount required by the cleaning with stationary, conical cleaning jets.
A further advantage of the method is the use of cleaning jets ejected by flat nozzles, whose force--and therefore their cleaning effect --is essent
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"Hochwirksame Tropfenabscheider bei der Rauchgasreinigung", Chemische Industrie, vol. 1/83, by Seigfried Bulang (3 pages).
Excerpt from "Perry's Chemical Engineering's Handbook" Sixth Edition, pp. 18-74.
Hartig Stefan
Wolf Hubert
Wurz Dieter
Dubno Herbert
Spitzer Robert
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