DE2542311C2 - Electrostatic trap - Google Patents

Description

Scheider.

35 Fig.2 shows a horizontal longitudinal section through the dust separator according to FIG. 1.

The invention relates to an electrostatic fi g. 3 shows a horizontal longitudinal section through

Dust separator with collecting electrodes and an electrode arrangement according to the invention,

flat plates existing spray electrodes, where F ι g. 4 shows a second and

discharge tips protrude from the plates. 40 Fig. 5 a third example for the invention

Due to the plate-shaped design of the spray electrode arrangement

These dust separators differ entirely from one another. The well-known dust separator of FIG. 1 and 2 has

essentially of those in which the spray electrodes have a housing 1 with gas inlet 2 gas outlet 3 and

Dust collecting bunkers 4 are made of thin wires or lace-studded strips. In housing 1, ρ atten-

Plate-shaped spray electrodes are essentially 45-shaped precipitation electrodes 5 and parallel to them

more stable less risk of corrosion and spray electrodes 6 with discharge tips can be arranged,

better to clean off the dust deposited on it. As shown in FIG. 2 it can be seen is the distance, wipe

Known dust separators of this type are, for. B. from the various electrodes constant, so that

DE-OS 15 57 163 and DE-GM 18 88 228 BE gas lanes of consistently the same width,

Both types of electrodes are known here as plates. In the exemplary embodiment in FIG. 3 have the lower

The high-voltage spray electrodes 5a form a waveform. The spray electrodes

electrodes have additional spray tips, of which 6a consist of flat plates, on which in certain

emanate from corona discharges. The flat surface spacings discharge tips 7 are seated. The order

areas of the spray and precipitation electrodes hai-

ten a constant distance from each other. 55 zest distance a between a point 7 and d «:: r to the left

When operating this dust collector - especially the lying precipitation electrode 5a is larger than that

Cleaning hot gases - it was found, however, that vertical distance ft between the precipitation elec-

Even at relatively low voltages, there is a strong discharge electrode 5a and the closest plate-shaped one

fertilize from the spray tips, which have a wide spray electrode 6a. If a high voltage V is applied to the

re desired voltage increase impossible ma- 60 spray electrodes 6a are placed, so forms with earthed

_Chen precipitation electrode 5a between the Sprtihspitze 7

This allows the electric field strength E = V ·. d and the closest point on the

(V = voltage, d = shortest distance to the opposite pole electrode 5a with the distance a one field strength

gen electrode) cannot be increased so that a ho- E = V / a off. In contrast, the field strength is

her degree of dust separation is achieved. 65 half of the area of the discharge peaks between the

The object of the invention is to make electrodes 5a and 6a larger and increase up to the value

to shape or to arrange that also for hot gases V / b. The high field strength outside the spray area

a high degree of separation is achieved. improves the separation force of the separator there, see above

that dust will preferentially precipitate in the area with the shortest distance to the spray electrode 6a.

Notwithstanding the description of FIG. 3 it is also possible to select the locations of the preferred spray discharge not to be formed by individual tips, but by a vertical, continuous wire, whereby the wire can also be angular.

In the example of FIG. 4, the collecting electrodes 5b are designed as vertical tubes with an oval cross-section. Here, too , the shortest distance between a tip 7 of the plate-shaped spray electrode 6a and the collecting electrode is greater than the shortest distance between the collecting electrode and the spray electrode. As is readily apparent to a person skilled in the art, the cross-sectional shape of the low-impact electrodes of an arrangement according to FIG. 4 can also be chosen round.

According to FIG. 5, the collecting electrodes 5c consist of narrow, separate plates, the spray electrode 6a as in FIG. 3 and 4 is formed. The side edges of the collecting electrodes 5c in FIG . 5 are rounded for better stability.

1 sheet of drawings

30th

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Claims (1)

According to the invention this is achieved in that the the S heating electrodes with discharge electrodes from the plates. Sr Γ5 is greater than the vertical distance b, however, to the higher value V / b , whereby de on between the spray electrodes (6a; and the lower part of the charged dust particles exerting force «W ^ ektrodeni5a. * CJ ßert and the dust separation improved w.rd. *? Hd £ SiSSi S ^ tal-cheite after An The ratio a to b of the above! Defined, soruchl characterized in that the electrode distances can e.nen any value larger sRatio a larger than l perm. as 1, i.e. at least 1.1 to 1. Above all 3 Electrostatic dust separator according to An, structural aspects as well as also 1 or 2 are characterized in that the question of the flow resistance for the distance ratio a to b to be reduced is at least 1.25 to 1 gas, which distance ratio VT * 20 a to b is chosen on a case-by-case basis. It is appropriate 4 An electrostatic dust collector to 1 einzuderAnsDrüche 1 to 3, characterized by a this distance ratio is at least 1.25 that filters, so that the smaller distance b associated with the collecting electrodes (5a; wavy Removing greater field strength E the desired Wen for the formed dust deposition on the Precipitation selecti ode has 5 electrostatic dust collector according to a 25 In practice it is possible to increase the ratio a to b up to claims 1 to 3, characterized in that about 6 to 1 and even beyond that, the collecting electrodes {5b) as in cross-section further configurations of the invention round or oval tubes are formed. are described in claims 4 to 6. 6 Electrostatic dust separator after a The drawing shows examples of the invention Claims 1 to 3, characterized in that 30 benches of the electrodes can be used in comparison Precipitation electrodes (5c; electrostatic dust collectors were known as individual plates. ^, " hMHetsind ^Fi S · ' ^zei S ^{l a} vertical longitudinal section through a- are trained. ^ _{well-known) schematically} illustrated dust separation