DE1557102A1 - Electrostatic filter - Google Patents

Description

dr. .w.'Schalk dipl-ing. Peter Wirth

DIPL-INCCEM ₁ DANNENBEkG · DR. V. SCHMIED-KOWARZIK

6 FRAN KFURT AM MAIN

OR. ESCHENHEIMER STR. 39

(PW) / Sr / Lu / Stt
September 9, 1966

Case 651 Koppers Company Pittsburgh "Pa. / UNITED STATES.

Electrostatic filters

The invention relates to electrostatic filters having a plurality of active and passive ones. Electrodes _t holders or supports for the electrodes and knocking devices for knocking off the dust particles deposited on the passive electrodes from grass flowing past the electrodes under the effect of a potential applied to the electrodes ^

In the conventional electrostatic filters, a dual electrode arrangement uses »the active or spray electrodes and passive or collecting electrodes includes "Usually the active electrodes are evenly spaced placed between the passive electrodes and held in place by a bracket that is connected to an insulator is, which is provided between this holder and the outer wall of the filter. This bracket can be made of metal . consist and TJ or angular or otherwise shaped and is usually also used to supply high voltage

009811/1226

Sound of a power source to the active electrodes "They pass." Electrodes are also attached to brackets or carriers, which are movably attached to and over the filter wall are grounded

When using the filter, there is a distinction between active and passive Electrodes a high voltage potential built up This potential causes a corona discharge around the active electrodes, so that small particles or dust in a gas stream flowing past the electrodes with. static electricity and thereby being attracted to the passive electrodes · sound time, time, the electrodes and brackets are vibrated or tapped to loosen the dust that has accumulated, and then. falls into a collecting container.

usually the yarria instructions are for. Knock off the electrodes at. whose. Brackets or carriers, braoed »so that the dust is removed frequently and large deposits do not normally form. The strength of the vibration - that I usually require. is. to only tone the dust build-up. the bracket remove * is, however, so great that damage in the construction, the holder often occurs »If you put the dust on the Can sit brackets, so he can easily bridge the gap between the active and passive electrodes and thereby cause the formation of an electric arc. If this is the case, the voltage regulator reduces the The filter automatically adjusts the voltage potential and thus also the filtration performance of the filter.

009811/1226

Certain types of dust are naturally tough, while others are tough, e.g. due to the condensation of moisture contained in the gas · Therefore, such types of dust tend to accumulate on horizontal surfaces »such as the top of the passive electrodes and the mounts · If, the dust itself accumulates in such an ICaBe that the angle of repose is exceeded, it falls down and returns to the Gas flow, as a result of which the filtration efficiency of the filter is reduced · The one described above and normally used Vibration is not enough to make this tough. Remove dust ..

The invention is based on the object of a filter which reduces the accumulation of dust on the electrode holder and removes such deposits without damaging the electrode holder »

The new filter is marked to solve the problem of 3 by overlying the tops of the electrodes and the holders or carriers, an accumulation of usually themselves preventing dust particles from depositing on these upper surfaces Surfaces. -

Advantageously, knocking devices can be provided with which these additional surfaces can be made to vibrate in order to remove the dust that has accumulated may have accumulated them, these surfaces can be inclined to the horizontal, so that the angle of repose of the dust enlarges and thereby delays an accumulation

009811/1226

According to an advantageous embodiment of the invention is an angle piece or angle profile above the top of the central beam for the vertex upwards pair electrodes or collecting plates arranged. The middle beam is connected in the usual way to the outer wall or the housing of the electrostatic filter and is not set in vibration. The vibration of the elbow is produced by a tapping device attached to the housing of the filter is connected and fed by a suitable power source. This elbow is attached so that its The apex forms a cone over the flat top of the beam over which it is placed. At this elbow are Rod-like fingers or rods attached at a distance from one another and protrude outwards so that they are above the tops of the collecting plates · The ends of these fingers and the elbow are up movably mounted, so that when vibration is generated, the dust deposited on these parts is removed without this however, the vibration is transmitted to the electrode holder. The inclined surfaces of the elbows prevent the Accumulation of dust, and due to the vibration all become

yet.
Removed dust particles that were deposited there.

Further features of the invention emerge from the following- »The description of exemplary embodiments as well as from the enclosed Drawings; in these shows

1 shows a schematic representation of the filter according to the invention seen in section from the side;

009811/1226

FIG. 2 is an isometric view of the filter of FIG. 1, with some parts left out}

3 shows a schematic representation of another embodiment of the invention seen in section from the side »and

4 shows a section along the line Ji-A. of Fig. 3.

According to Fig. 1, an electrical high voltage potential of a suitable power source (not shown) to the negative Electrode 18 and the passive electrode 10 applied · The thereby Occurring corona discharge causes small particles that in the flowing past the electrode. Gas are included with static electricity and charged by the passive or Collective electrode 10 are attracted *.

As shown in Figures 1 and 2, there is the passive electrode assembly of several, passive ones. Electrodes or collecting plates 10, the with the help of clamps 13, which · fixed to the collecting plates connected by. Cross members. 11 and. 12 hang down. Of the middle support 12 is fixed to the. Housing or the outer wall 14 of the filter, e.g. by welding or removing it (not shown), connected and earthed via this. The side supports 11 are movably or resiliently attached to the housing 14 by them firmly with hanging rods. 15 connected by, the housing hindu ears. The part of the Bars is fixed with a vibration or knock gate device 16 tied together. The knocking device is in turn by means of a Compression spring 17 movably or resiliently arranged on the housing,

009811/1226

each compression spring lying between the rapping device and the housing. It is particularly advantageous to use the arrangement described in detail in US Pat. No. Nx. 3,030,733 to JW Pennington at column 2, lines 1-26.

active or spray electrode system consists of several. Electrodes 18, preferably in Eorm. of wires attached to and hanging from a bracket 19. The holder typically consists of a steel angle piece that beweglioh or "is resiliently mounted on the housing 14 by was firmly connected to suspension rods 20 ·, which project through the housing. The part of the rods located outside the housing is firmly connected to a vibration or knocking device 16. The tapping device is in turn arranged a compression spring 17 beweglioh or resiliently against de »housing, each pressure spring is mounted between the tapping device and an isolator 21 on the housing so that is not grounded to the discharge electrodes via the holder 19 voltage supplied through the housing . This connection is also preferably established in accordance with the statements in the patent mentioned.

In the hitherto usual embodiment, there is the disadvantage that on the upper sides of the parts, welohe the electrodes hold, dust accumulates · In addition, dust also accumulates on the top of the collector plates. The usual tapping the electrodes are not sufficient to keep any dust build-up

009811/1226

■ - 7 -

remove · Stronger vibration can damage the Brackets or brackets occur, especially in the * center bracket, which is usually directly attached to the filter housing · This problem occurs particularly when the dust due to its nature, moisture or the like, is tough. This difficulty arises in a manner according to the invention now resolved by taking precautions to prevent such accumulations of dust and remove any deposits.

As can best be seen from FIGS. 1 and 2, according to the invention, an inverted or with the apex pointing upwards is used, which is loosely guided by means of pegs 23 on the upper side of the central support 12 " a push rod 24 is, sb ', firmly connected by welding to the angle piece 22 and is so far beyond the ends of de · angle piece before that this is movably mounted in the housing. In addition, several rod-shaped fingers 25 firmly attached to the angle piece * which are arranged at a distance from one another in such a way that they lie over the upper sides of the collecting plates 10 *. You from the ninht. The ends of the fingers that are remote from the elbow are bent into loops or eyes 26 which are loosely placed around upstanding pins 2 ^ which are fastened to the carriers 11. In this way, tops are obtained which prevent the accumulation of dust, since they are inclined to the horizontal tops of the supports and the collecting plates.

009811/1226

But if you can still collect some dust, it will be another additional knocking device is provided with which the aforementioned inclined surfaces can be set in vibration to also to remove these dust deposits. You push rod 24 protrudes through the one housing wall and is firmly connected to a knocking device 2Θ, which is in the & eichen way on the Housing is attached like the knocking devices 16 for the active and passive electrodes.

During operation, in a known manner between the active Electrodes. 16 and the passive electrodes 10 formed a high voltage potential. When the gas to be purified passes through the filter hindurohetröat, the dust it contains becomes static with Electricity charged with the same polarity as the active electrodes. They are thereby charged by the particles vertical surfaces of the collecting electrodes are attracted * From time to time the collecting electrodes 10 are caused to vibrate with the aid of the knocking devices 16, whereby the deposited Dust is loosened and falls into receptacles (not shown) below the electrodes. Part of the dust is from the inclined surfaces, e.g. surface 22S, which lie above the beams, but it falls partly as a result of its Weight down again. The remaining dust is then removed by tapping the inclined surfaces by switching on the additional tapping device 28. The knocking device 28 is expediently coupled to the usual knocking devices so that they are all switched on at the same time. If desired, the rapping device 28 but can also be switched on alone, so that they can be

009811/1226

be operated at intervals than the usual knocking torque can·

In the embodiment shown in FIGS. 3 and 4, the usual tapping devices of the filter are also used to tap the inclined surfaces. Here, inverted angle pieces 22 and 30 are provided, which lie over the cross members 11 and 12 for the collecting electrodes. The elbow 22 over the. The middle support 12, on the other hand, is only held loosely, as described above. The fingers 31 lie at a distance from one another over the collecting plates 10 ₁ and their ends 35 are firmly connected to the angle pieces 22 and 3Q. This creates an arrangement of interconnected sohrägen surfaces »which are set in vibration when the usual knocking devices are switched on. If desired, as a holder 29 for the wire haw. Spray electrode 18 an angle piece pointing upwards with the Seheitel can also be used * as shown in Fig. 4. Dust prevented and with which deposited dust particles can be removed if the inclined surface is set in vibrations by the knocking devices of the wire electrodes.

BADORiGSNAL

00981171228

Claims (1)

1557102 claims · Electrostatic filter with several active and pass ** / s Electrodes, holders or supports for the electrodes and knocking devices for knocking off the passive ones Electrodes made from a gas flowing past the electrodes Dust particles depositing under the action of a potential applied to the electrodes, characterized by over the upper sides of the electrodes (10 or 18) and the carrier (11 or 12) provided, an accumulation of itself on these Surfaces that prevent deposits of dust particles on the top (22, 25, 30, 31, 29). 2. filter naoh claim 1, characterized in that the daduroh Areas (22, 25, 30, 31, 29) on a knocking device (26) are worn 3 'filter according to claim 1, characterized daduroh, DAFL the fläohen (22, 25, 30, 31, 29) and the electrodes (10, 18} are connected to one and the same Abklopfvorrichtung (16). *' Ι 4 · filter naoh claim 1, characterized in that the fläohen (22, 25, 30, 31, 29) are connected to a device that causes them to vibrate. filter according to one of the suggestions 1 to 4 »characterized by this 009811/1226 4i net that the surfaces (22, 25, 30, 31, 29) to the horizontal are inclined. 6. Filter according to one of claims 1 to 5, characterized in that, that the surfaces (22, 25, 30, 31, 29) above the carriers (12 and 11) for the passive electrodes (10) by means of angle pieces (22 and 30, respectively) with the upturned apex of each elbow above the girders (12 or 11). 7. Filter according to one of claims 1 to 5, daduroh gekennzeiohnet, that the surfaces (22, 25, 30, 31, 29) over the passive Electrodes (10) extend over their upper side Rods (25) are formed, which with knocking devices (16) · stay in contact. 8. Filter according to claim 1, with a central support and lateral Carriers for the electrodes and a housing for the electrodes and the carrier, characterized in that above the central carrier (12) for the electrodes (10, 18) with the * - ■ ■ Soheitel upward facing surfaces inclined to the horizontal having an angle piece (22) is arranged, on which several extend over the upper sides of the passive electrodes (10) extending rods or fingers (25) are attached at one end, the other ends of which are movable or articulated the lateral supports (11) are attached, and that a push rod (24) is firmly connected to the Y-leg piece (22), which is movably mounted in the housing and is connected to knocking devices (28) attached to the housing. 009811/1226 9 · Filter according to one of claims 1 to 8, characterized in that that the active electrodes (18) are connected to a knocking device which is isolated from the filter housing. 10. Filter according to claim 9, characterized in that the knocking devices (16) for the active and passive electrodes (18, 10) are mounted in the housing in such a way that they are effective in the vertical direction, while the knocking device (28) is effective in a horizontal plane. The patent attorney: P «ten» - DipUr "! · ■; ■. (VMh Dipl.-I: · ". ^N 'λ * · --v:»! »Erg Dr. V. 3d .. ■: .. - -jwik Gr EscKemtieimörStr. 39 '' Λ J L " 109811/1226 Blank page