FR2516404A1 - ELECTRO-FILTER - Google Patents

Abstract

ELECTRO-FILTER FOR GAS TO PURIFY CIRCULATING HORIZONTALLY IN WHICH THE GAS FLOWS BETWEEN SEVERAL PLANS OF ADJACENT ELECTRODES 15, 16 PARALLEL IN THE DIRECTION OF GAS CIRCULATION, THE PLANS OF ELECTRODES HAVING SEVERAL PARALLEL ELECTRODES EXTENDED LONG-LENGTH SPACED ONE OF THE OTHERS IN THE DIRECTION OF GAS CIRCULATION, THE ELECTRODES OF ONE PLATE OF ELECTRODES IN TWO 15 BEING NEGATIVELY CHARGED EMISSION ELECTRODES AND THE ELECTRODES OF THE REMAINING PLANS OF ELECTRODES 16 BEING PRECIPITATION ELECTRODES, A THE MASS, EQUIPPED WITH A STRIKING DEVICE 9, 10 TO DETACH THE DUST ADHESIVE TO THEM AND TO CAUSE IT TO FALL IN A COLLECTION POCKET LOCATED BELOW. ACCORDING TO THE INVENTION, THE ELECTRO-FILTER INCLUDES AT ITS TOP A trap 11 THROUGH WHICH THE ELECTRODES CAN BE CLEANED FROM THE EXTERIOR OF THE ELECTRO-FILTER MANUALLY AND IN THE LONGITUDINAL DIRECTION OF THE ELECTRODES WITHOUT DAMAGING THEM. THE NEED TO CLEAN THE ELECTRODES FROM THE INSIDE OF THE ELECTRO-FILTER HOUSING IS THUS AVOIDED.

Description

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  The present invention relates to an electro-filter

  for a gas to be purified flowing horizontally, the present

  in particular relating to an electro-filter

  an electro-filter housing whose opposite ends have an inlet for the gas to be purified and an outlet for the purified gas free of dusty impurities, and whose part

  inferior has at least one collection bag for the

  which has been separated The housing of the electro-filter of the elec-

  trilter according to the invention also comprises, in vertical planes parallel to the direction of circulation of the gas, and spaced apart

  elongate parallel and spaced elongated electrodes

  in the flow direction of the gas, of which emission electrodes are arranged in every other plane and are preferably negatively charged, the other electrodes of

  precipitation, being grounded and preferably provided with

  positive hitters to detach the dust adhering to them and to cause the dust to fall into the collection bag under the electrodes The electro-filter housing further comprises at least one opening door for cleaning the electrodes itself.

  found in the electro-filter housing.

  It is possible to purify gases by means of electro-

  filters by very completely separating the particles analogous to

  In electro-filters of the type mentioned above,

  above, the dusty particles are separated into

  electrically gating by means of electrons released from the electrodes

  emission, the electrons tending to move towards electro-

  In this way, the dusty particles can be made to adhere to the precipitation electrodes without being precipitated.

  recaptured by the circulating gas, the dust particles

  it can then be separated from the precipitation electrodes and, if appropriate, also emission electrodes by striking them at certain intervals in order to detach the dust and

  bring them to fall into the collection pockets under the electro-

  of; the dust can then be removed from the pockets by means of, for example, screw conveyors or other mechanical devices

  In order to obtain sufficient effectiveness of separation

  the electrode planes should be placed as close as

  possible from each other but not enough to touch each other.

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  However, in the case where too much dust is collected on the electrodes, there may be contact between them, in which the electrostatic field between the emission and precipitation electrodes virtually disappears. Such a situation may occur despite the fact that one shakes and strikes the electrodes, and in such a case, or preferably

  before, at regular intervals the electrodes must be clean.

  For this purpose, there is, at the bottom

  of the side wall of the electro-filter housing of the electro-

  filters one or more manholes through which a man can penetrate inside the electro-filter housing for

clean the electrodes.

  The planes of the precipitation electrodes usually comprise a plurality of rigid precipitation electrodes which are vertically elongated and provided with curved edges and

  of a flat intermediate part, the planes of the electrodes of

  between the precipitation electrodes consisting of

  several vertical electrode wires The cleaning of such electri-

  trodes from the inside of the electro-filter housing is very

  difficult and complicated First of all, it reigns inside the box-

  electro-filter often a relatively high temperature even if the housing has been allowed to cool for a while

  before cleaning; secondly, cleaning in the

  a plurality of elongate and vertically-like transmitting electrodes and precipitation electrodes having a fluted cross-section is very difficult; in

  Thirdly, this cleaning in the transverse direction easily

  In this case the electro-filter housing must be open and the damaged electrode plane must be replaced or repaired. In addition to the heat, the service worker is also exposed to heat. very dusty air inside the electro-filter housing that interferes with

  both breathing and visibility For economic reasons

  However, it is often necessary to achieve very high electro-filters, in which case the length of the electrodes is also great, for example 10 m or more. In such a case, the worker carrying out the cleaning must climb very high inside. of the electrode housing, which is very dangerous, given the

  poor visibility conditions there.

  The present invention proposes to produce an electro-

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  filter in which the cleaning of the electrodes is easier and more enjoyable than previously and in which the process of

  cleaning does not subject the electrodes to mechanical stresses

  The object of the invention is also to provide an electrostatic filter in which the electrode planes can be

  simply removed from the electro-filter housing for replacement

  additional maintenance or cleaning.

  This object is achieved according to the invention in an electro-

  filter of the type mentioned in the preamble in that the trap is at the top of the electro-filter housing, above the electrodes, so that the cleaning can be carried out

  the outside in the longitudinal direction of the electrodes.

  Thus, in the electro-filter according to the invention, the cleaning problem has been solved in a very simple way without exposing the personnel composed for this purpose to heat and dust inside the electrofilter housing. cleaning

  in this case being carried out in the longitudinal direction of electro-

  and thus the fluted cross-sectional profile of elec-

  trodes of precipitation has no troublesome effect, and the electrodes

  highly strained emissions are not subject to

  transverse stresses, the stresses being oriented substantially in the longitudinal direction of the wire, in which direction its resistance

is very good.

  When the top of the electro-filter housing has been opened, dust adhering to the electrodes can be effectively disconnected simply by shaking the upper end of the electrode, and if a cleaning brush is used, its

  operation can be automated by means of an elec-

  mechanical controller because the cleaning brush then travels vertically along the electrodes In this case, the long length of the electrodes and the great height of the plane

  Electrodes do not significantly complicate cleaning.

  It has now been observed that an electro-filter can be-

  provided with a large hatch without its airtightness is affected According to a preferred feature of the invention, this

  is obtained by framing the opening of the top of the housing of elec-

  three-way filter of the electro-filter of a sand pocket or the like in which the edge protruding from the lower surface of the hatch which covers the opening is of a similar size and shape. running a vacuum is

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  realized in the electro-filter housing, in which case the external air pressure tends to press the edge of the hatch so

  tight against the sand pocket surrounding the opening.

  The upper side of the hatch is preferably provided with one or more lifting handles or the like, by means of which the hatch can be lifted by means of a lifting device from above the electro-filter and may be

  moved on the side for cleaning the electrodes.

  In the case where the opening to be closed by the hatch at the top of the electro-filter housing is sufficiently large so that the electrode planes can be removed from the electro-filter housing, the electrode planes are preferably detachably supported by supports inside the electro-filter housing, the supports of the emission electrode planes being in this case isolated from the electrofilter housing and electrically connected to an external source of current for

  negatively charge the emission electrodes.

  In order to better understand the invention will now be described with reference to the drawing a particular mode

of realization.

On the drawing:

  FIG. 1 is a perspective view of an electro-

  filter according to the invention, partially in section,

  FIG. 2 is a sectional side view of the electro-

  FIG. 3 is a partial perspective view of a plurality of electrode planes used in the electro-filter of FIG.

figure 1.

  In FIG. 1, the electro-filter housing is designated by the numeral 1. At the two opposite ends 2 and 3 of the electro-filter housing, there is an inlet 4 for the gas to be purified and an outlet 5 for the purified gas, the gas to be purified in this case flowing in the horizontal direction through the electro-filter housing 1 The lower part of the

  housing has a dust collection pocket 6 for

  pick the dust separated from the gas and remove it from the

  The top of the electro-filter housing 1 is covered by two hatches, which have handles of

  17 to lift the hatches 11 and

  place on the side of their position above the electrical plans

  trodes 15 and 16 inside the electro-filter housing 1, the electrode planes being mounted, as seen in the gas flow direction, in two successive zones 22 and 23 in which the planes of electrodes 15 and 1b are located in the vicinity of

  swim immediately from each other parallel to the walls

  21 of the electroluxile housing 1: that narrow traffic channels are formed between the

filters 15 and 16.

  Figure 2, which is a sectional view, shows in more detail the position of the adjacent filter planes 15 and 16. The emission electrode plane 15 is supported so that it can be detached and lifted, by means of supports L 8. relaxing

  on the housing of electro-filter 1 and is isolated by means of iso-

  electro-filament housing 4 and is connected to the negative pole of an external current source (not shown). Furthermore, the emission electro-planes 15 are provided with a striking device 9 for detaching. the dust that could adhere to the emission electrodes and to cause it to fall into the collecting bag 6 located below The precipitation electrode planes 16 are suspended from supporting beams 19 which rest, from nanowear to to be detached and lifted, on the electro-fitter box.

  in addition to the electrode planes 16 are provided with a striking device

  scared 10 to hit the precipitation electrodes so as to detach the dust adhering to them, and bring it to Lomber dalns

  the collection bag 6 disposed below.

  So that the electrodes can be cleaned from

  the outside of the electro-filter housing 1, in the long direction

  tudinal electrodes, and so that the planes d: electrodes 15 and

  16 may, if necessary, be removed from the dwelling *:

  1, the upper side of each separation zone 22 and 23 has an opening 12 large enough that the plans

  electrodes 15 and 16 can be removed from the electrode housing.

  filter 1 through these openings 12 and that in addition the electrodes can be easily cleaned from above and outside the electro-filter housing when the hatches 11 covering these openings are raised and moved laterally away from the openings Cleaning can be done by striking the upper ends of the electrodes and / or lifting or

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  lowering a cleaning brush in the narrow gaps between the electrode planes 15 and 16 In this case the cleaning takes place in the longitudinal direction of the electrodes and a

  can be used as a means of assistance.

  killing the cleaning does not need to go down into the electrofilter housing but can be placed for example on the beams

  19 supporting the electrode planes 16.

  In order to seal the hatches 11, there is disposed around the edge of each opening 12 a pocket of sand 13 in which the edge 14 curved downwards from the edges of the trap has been engaged to be housed tightly The vacuum prevailing in the electro-filter in operation causes the pressure of the ambient air to squeeze the edges of the hatches it effectively

in the pockets of sand 13.

  The electro-filter shown in FIGS. 1 and 2 is also provided with manholes 24 in the lower part of its side walls 21, but these no longer need to be used for cleaning the electrodes but only , by

  example, for the maintenance of devices inside the box-

  electro-filter 1, such as for example the devices

batters 9 and 10.

  The structure of the electrode planes 15 and 16 is represented

  As can be seen in FIG. 3, the transmission electrode planes 15 are shown in greater detail in FIG.

  comprise a tubular frame 26 and the wires 7 serving as elec-

  Transmitting trodes have been vertically tensioned at regular intervals from each other between the horizontal portions of the frame. The precipitation electrode planes 16 on the other hand consist of profiled sheets 8 having a fluted cross-section, suspended from the support beams. 19, the lower ends of the sheets being attached to bars 25, at the ends of which is mounted the striking device 10 shown in Figure 2 to detach the dust adhering to the

precipitation electrodes 8.

  As can be seen clearly in FIG. 3, the clearance made between the electrode planes 15 and 16 is not very

  important and so it is clear that the cleaning is consid 6-

  Easier to achieve in the vertical direction than in the transverse direction When the cleaning is done in the vertical direction, the profile of the sheet precipitation electrodes 8

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  does not complicate the cleaning and the thin emitting electrode wires 7 are not broken as easily as they could be if the cleaning were carried out in the transverse direction. The present invention thus constitutes a considerable progress compared with the electrodes. previously known filts that need to be

cleaned from the inside.

Claims (4)

  1 Electro-filter for gas to purify circulating horizon-   with an electro-filter housing (1) provided with a   end (2) of an inlet (4) for the gas to be purified and the ex-   opposite end (3) of an outlet (5) for the gas which has been purified from dust-like impurities and having at the bottom at least one collecting pocket (6) for the separated dust, a plurality of elongate electrodes vertical lines (7, 8) being mounted in the electro-filter housing (1) in adjacent vertical planes (15, 16) parallel in the gas flow direction and mutually spaced apart, the electrodes acting as electrodes emission (7) preferably located in a   out of two, being negatively charged and the other electro-   as precipitation electrodes (8) being grounded and   preferably provided with striking devices (9, 10) for detaching   dear dust adhering to them and to bring it to fall into   a collection pocket (6) underneath, the electrical housing   triple-filter (1) having at least one opening hatch for cleaning the electrodes (7, 8) in the electro-filter housing, characterized in that the trapdoor (11) is located at the top of the housing electro-filter (1) above the electrodes (7, 8) so that the cleaning can be carried out from the outside   in the longitudinal direction of the electrodes (7, 8).   Electro-filter according to Claim 1, characterized in that the flap (11) is hermetically mounted on the opening (10) in the apex of the electro-filter housing (1).   by means of a pocket of sand (13) or the like flanking the opening   ture, an edge (14) of the same size and shape, projecting from the lower surface of the hatch (11) being provided for housing in said pocket.   Electro-filter according to any one of the   cations 1 and 2, characterized in that the opening (12) to be closed by the hatch (11) at the top of the electro-filter housing (1) is of such size that the electrode planes (15, 16 ) can be removed from the electro-filter housing (1) for   replacement, maintenance or cleaning.   Electro-filter according to any one of the   cations 1 to 3, characterized in that the upper side of the   trapdoor (11) has at least one lifting handle (17) or logue. -8- -9- 2 2516404   Electro-filter according to any one of Claims 3 and 4, characterized in that the electrodel planes (15, 16) are supported by supports (18, 19) inside the electrofilter housing. (1), at least the supports (18) of the transmission electrode planes (15) being isolated (20) from the housing electro-filter (1).