CA1098052A - Dust precipitator - Google Patents
Dust precipitatorInfo
- Publication number
- CA1098052A CA1098052A CA304,475A CA304475A CA1098052A CA 1098052 A CA1098052 A CA 1098052A CA 304475 A CA304475 A CA 304475A CA 1098052 A CA1098052 A CA 1098052A
- Authority
- CA
- Canada
- Prior art keywords
- electrodes
- precipitator
- frame
- string
- medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/02—Plant or installations having external electricity supply
- B03C3/16—Plant or installations having external electricity supply wet type
Abstract
ABSTRACT
According to the present invention, there is provided an electrostatic dust precipitator of the wet type, comprising a frame having an inlet for the medium to be cleaned, an outlet for the medium after cleaning and, a fan intermediate the outlet and the outer portion of the frame for causing the medium to flow through the electrostatic dust precipitator. Within the frame are positioned electrically connected alternate positive and negative electrodes, the positive electrodes being string or rod electrodes and the negative electrodes being plate electrodes. A high voltage source is connected to the electrodes and means are provided for causing a flushing fluid to wash down the string electrodes in a direction perpendicular to the flow of the medium being cleaned. A basin is provided at the bottom of the frame for catching the flushing fluid and a pump is provided for pumping the flushing fluid to the means for causing the fluid to wash down the string electrodes. The electrode elements are very easy to clean and maintain, and provide for a simple and economical construction. Various sizes of dust precipitators can be manufactured using only a few sizes of electrode elements.
According to the present invention, there is provided an electrostatic dust precipitator of the wet type, comprising a frame having an inlet for the medium to be cleaned, an outlet for the medium after cleaning and, a fan intermediate the outlet and the outer portion of the frame for causing the medium to flow through the electrostatic dust precipitator. Within the frame are positioned electrically connected alternate positive and negative electrodes, the positive electrodes being string or rod electrodes and the negative electrodes being plate electrodes. A high voltage source is connected to the electrodes and means are provided for causing a flushing fluid to wash down the string electrodes in a direction perpendicular to the flow of the medium being cleaned. A basin is provided at the bottom of the frame for catching the flushing fluid and a pump is provided for pumping the flushing fluid to the means for causing the fluid to wash down the string electrodes. The electrode elements are very easy to clean and maintain, and provide for a simple and economical construction. Various sizes of dust precipitators can be manufactured using only a few sizes of electrode elements.
Description
;~ 5~
The present invention relates to an electrostatic dust precipitator.
Electrostatic dust precipitators are used to remove impurities in the air, to clean and separate gases and to remove particles found in gases. In certain prior art devices, the medium to be cleaned - e.g. air - is passed through a space provided with discharge electrodes and collector plates.
Between the discharge electrodes and the collector plates is arranged a high enough voltage to produce a corona discharge from the discharge electrodes and an electrostatic field between the electrodes and collector plates. Thère is preferably a negative voltage at the discharge electrodes to produce a negative corona and ionization. During the corona discharge, both positive : .
and negative ions are developed, whereby the positive ions remain at the discharge electrode because of its negative charge, while the negative ions stream against the collector plates along the lines of force of the electrostatic field. The negative ions will now catch the particles to be removed from the medium, charge them and carry them onto the collector plates. The medium, thus cleaned of particles, is then exhausted from the other end of the device. The collector plates are periodically cleaned to remove the dust deposited on the collector pl~tes, such cleaning generally being performed by means of powerful water sprays or vibrators. Such cleaning of the colIector plates is often difficult because dust particles adhere strongly to the collector plates. The cleaning mechanisms become very complicated and expensive and, therefore devices of this type are generally -~
used only for large-scale dust removing operations, such as in central air conditioning plants.
Wet-type electrostatic precipitators are also known, in which simultaneously with the air to be cleaned there is provided a continuous spray of finely divided water droplets. These droplets are ionized by the discharge electrodes and attract the dust particles found in the air and carry them onto - , ': ' '' ' .
.
5~
the collector plates. The construction of this kind of precipitator is very complicated and maintenance is also difficult causing high utility costs.
An object of the present invention is to provide an effective and constructionally simple electrostatic dust precipitator suited especially for room air-conditioning as well as industrial dust precipitation.
A further object is to provide a device using as little energy as possible, and wherein the dust particles are continually flushed away providing simplified maintenance of the device.
Thus, according to the present invention, there is provided an 10 electrostatic dust precipitator of the wet type, comprising a frame having an inlet for the medium to be cleaned, an outlet for the medium after cleaning and, a fan intermediate the outlet and the outer portion of the frame for causing the medium to flow through the electrostatic dust precipitator.
Within the frame are positioned electrically connected alternate positive and negative electrodes, the positive electrodes being string or rod electrodes and the negative electrodes being plate electrodes. A high voltage source is connected to the electrodes and means are pro~tided for causing a flushing fluid to wash down the string electrodes in a direction perpendicular to the flow of the medium ~eing cleaned. A basin lS provided at the bottom of the ~0 frame for catching the flushing fluid and a pump is provided for pumping the flushing fluid to the means for causing the fluid to wash down the string electrodes.
The invention will now be described further by way of example only and with reference to the accompanylng drawings, in which:
Fig. l is a schematic illustration of the basic principle of operation of a device according to the invention;
Fig~ 2 is a sectional view of a device according to the invention, viewed from one side and depicted chiefly schematically;
The present invention relates to an electrostatic dust precipitator.
Electrostatic dust precipitators are used to remove impurities in the air, to clean and separate gases and to remove particles found in gases. In certain prior art devices, the medium to be cleaned - e.g. air - is passed through a space provided with discharge electrodes and collector plates.
Between the discharge electrodes and the collector plates is arranged a high enough voltage to produce a corona discharge from the discharge electrodes and an electrostatic field between the electrodes and collector plates. Thère is preferably a negative voltage at the discharge electrodes to produce a negative corona and ionization. During the corona discharge, both positive : .
and negative ions are developed, whereby the positive ions remain at the discharge electrode because of its negative charge, while the negative ions stream against the collector plates along the lines of force of the electrostatic field. The negative ions will now catch the particles to be removed from the medium, charge them and carry them onto the collector plates. The medium, thus cleaned of particles, is then exhausted from the other end of the device. The collector plates are periodically cleaned to remove the dust deposited on the collector pl~tes, such cleaning generally being performed by means of powerful water sprays or vibrators. Such cleaning of the colIector plates is often difficult because dust particles adhere strongly to the collector plates. The cleaning mechanisms become very complicated and expensive and, therefore devices of this type are generally -~
used only for large-scale dust removing operations, such as in central air conditioning plants.
Wet-type electrostatic precipitators are also known, in which simultaneously with the air to be cleaned there is provided a continuous spray of finely divided water droplets. These droplets are ionized by the discharge electrodes and attract the dust particles found in the air and carry them onto - , ': ' '' ' .
.
5~
the collector plates. The construction of this kind of precipitator is very complicated and maintenance is also difficult causing high utility costs.
An object of the present invention is to provide an effective and constructionally simple electrostatic dust precipitator suited especially for room air-conditioning as well as industrial dust precipitation.
A further object is to provide a device using as little energy as possible, and wherein the dust particles are continually flushed away providing simplified maintenance of the device.
Thus, according to the present invention, there is provided an 10 electrostatic dust precipitator of the wet type, comprising a frame having an inlet for the medium to be cleaned, an outlet for the medium after cleaning and, a fan intermediate the outlet and the outer portion of the frame for causing the medium to flow through the electrostatic dust precipitator.
Within the frame are positioned electrically connected alternate positive and negative electrodes, the positive electrodes being string or rod electrodes and the negative electrodes being plate electrodes. A high voltage source is connected to the electrodes and means are pro~tided for causing a flushing fluid to wash down the string electrodes in a direction perpendicular to the flow of the medium ~eing cleaned. A basin lS provided at the bottom of the ~0 frame for catching the flushing fluid and a pump is provided for pumping the flushing fluid to the means for causing the fluid to wash down the string electrodes.
The invention will now be described further by way of example only and with reference to the accompanylng drawings, in which:
Fig. l is a schematic illustration of the basic principle of operation of a device according to the invention;
Fig~ 2 is a sectional view of a device according to the invention, viewed from one side and depicted chiefly schematically;
- 2 ,, i .
, . .
.
' ~ ig. 3 is a f`ront view of one electrode of` a device according to the invention;
Fig. 4 is a side view of the electrode of Fig. 3;
Fig. 5 is a section on the line A-A of Fig. 1, showing a negative electrode plate;
Fig. 6 is an enlarged detailed view of the construction of the negative electrode plate shown in Fig. 5;
Fig. 7 is a side view, partly in section, of another embodiment of a dust precipitator according to the invention;
Fig. 8 is a front view of the device of Fig. 7;
.~ ,, .
Fig. 9 is a plan view of an electrode unit used in the device of Fig. 7;
Fig. 10 is a side view, partly in section, of the unit shown in Fig. 8;
Fig. 11 is a plan view of an alternative embodiment of the electrode unlt used in the device of Fig. 7; and Fig. 12 is a side view, partly in section~ of the unit shown in Fig. 10.
The principle of` an electrostatic dust preclpitator according to the invention is illustrated in Fig. 1, in which A and B are electrodes shown in cross-section. A is a negative plate electrode and B a positive string or rod electrode. Connected across the electrodes is a relatively high voltage of some kilovolts, which creates an electrostatic field between the electrodes.
When partlcle C is carried~by streaming air lnto this field, it is converted into an electric dipole and begins to move in the direction where the field .
strength is highest, in this case towards string B. Since, according to this invention, the string is formed ~y a jet or thin stream of fluid, the particle is carried away by it. Therefore, the air is not ionized to charge with :
~ electricity the particle to be removed~and no electric discharge is produced.
.
Referring to Figs. 2 to 6, a device according to the inventlon consists~of boxLike~frame l, most suitably of square or rectangular shapè. Top 2 of the '. ~ .
`' ~ , ' '~ , ' s~
boxlike frame is open and may be fitted with an openable lid for inspection and maintenance. Both ends are also open~ An opening in the end wall 3 is provided with air filter 4, in itself of known construction, and in the opposite end wall 5 there is fitted a fan 6 which causes air to fIow through the precipitator. Of course it is possible to provide the openings with suitable grilles or lattices which, without preventing the flow of air, protect the parts inside and are openable to make maintenance possible. The box:Like frame is most suitably made of appropriate plastic material for electrical insulation purposes. The bottom of the boxlike frame comprises a basin 7 for holding liquids and, under the frame, legs 8.
.. ., ~
Positive and negative electrodes 10 and 11 are arranged alternately and successively in the space 9. Positive electrodes 10 (Figs. 3 and 4) consists of a frame 12, with a liquid trough 13 or the like thereupon. lhe bottom of trough 13 is provided with srnall flow openings 14 arranged adjacent to one another and through the openings pass thin strings 15, the upper ends of which are fastened to a bar running along the middle of the trough and the lower ends to the~bottom part of the frame. The purpose of the strings is to act as guides for the flow of liquid. Water or some other liquid from the trough 13 runs along these strings. Oil is appropriate on account of its being non-conductive and therefore making lt easier to insulate the body of the devlce. If the liquid is non-conductive, the guide string has~to be of some ~
concluctive material such as metal. In the middle of the electrode frame there is provided an overflow pipe 17 for preventing the trough from being excessively filled. The troughs of individual electrodes are furthermore connected to each other by means of a connecting pipe 18, which keeps the fluid in all troughs at the same level. The inside surface of the boxlike frame of the device may be provided with slots into which the electrodes are pushed so that they take their correct position. Intermediate plates 19 .`?
'' ".' '. ' , :~ '' ' ' ', : ~ :
,. ,, , ' : , , separate the electrodes from each other and support them. The electrodes are, however, electrically connected with each other, e.g. by means of connecting pipe 18, which may be electrically conductive. The lower ends of electrodes 10 reach below the liquid level in basin 7. The precipitator is provided with pump 20 for pumping liquid from basin 7 to trough 13 when the precipitator is working and from trough 13 the liquid flo~s continuously down the strings 15.
The bottom of the basin is provided with a filterl the purpose of which is to collect impurities from the liquid in the basin, the filter being of replaceable or cleanable type.
Negative electrodes 11 are in the form of wire-net sheet (Figs. 5 and 6) .~ ~. .
or fine-mesh honeycomb plates so as to allow the air stream to pass through them. Plates 11 may also be solid plates without any hcles, provided that the alr flow is parallel to them. Plates 11 rnay also be coated with some electrically insultating material to prevent electric discharge between the electrodes. Most appropriately they are also fitted into the s]ots that are formed into the inside walls of the boxlike frame, such slots being provided with restrictors to prevent them from reachin~ down to the surface of the liquid in basin 7. The basin is provided witll transverse partitions directly below the electrodes; however, the partitions do not divide the basin into ; 20 totally separate sections.
To operate the precipitator, poles 22 of a voltage supply in excess of 4 kv are connected to the electrodes, and the pump and the fan are started. As voltage builds up in the electrodes and the flcw of the air to be cleaned passes through the precipitator, the unlike electric chargès of minute dust and other particles in the air separate and the particles become electric dipoles, as described above. The particles move to the string electrodes formed by the liquid stream, the stream then carrying the particles away and the alr becoming thus effectively cleaned. The poles of the voltage supply .
, : ' ., . ' . : :
'' '"' ' , ' ", " :' ' :
, 3L~ S2 can be reversed, and one of the two electrodes, e.g. the liquid stream, can even be grounded, if desired. Regardless of polarity, the direction of movement of the particles in the field remains the same, i.e. towards the stringlike electrode.
Ordinary tap-water is suitable for use in the precipitator, because tap-water contains enough salts to make the water electrically conductive. Of course, other liquids may also be used. If the flowing liquid is non-conductive the guide strings must be of some conductive material.
Figs. 7 to 12 illustrate a preferred embodiment of the invention. The device has a housing 30, preferably of plastic material. In the front wall 31 ~ . ,.
of the housing is an opening 32, through which air to be cleaned enters the device. In the opening 32 is attached a fan 33, which blows the air through the space 34 and the electrostatic elements attaohed within this space. The air is exhausted through another opening 35 at the opposite end. On the bott;om of the device there lS provided a basin 36 receiving the ~lushing water together with dust partlcles, flowing down from the electrode elements.
Communicating with the basin 36 is a pump 37 having a driving motor and filter. The filter prevents the dust particles from coming back into the elements together with the water which is pumped again back into the troughs along the upper part of the electrode elements through a hose 38. Only a `~ ~ low-powered pump is required for this purpose, because the amount of water requlred is quite small. The devioe is also provided with a voltage source, e.g. a voltage transformer 39, which transforms the supplied voltage into the operating voltage of about 4 kv.
The electrode elements (Figs. 9 to 12) of this embodiment comprise a rectangular frame 40 preferably made of plastic material. The frame 40 comprises vertical wall sides 41 and at the top and bottom are attached troughs 42. The upper troughs are open upwardly, thus forming channels to ~ , - -.
. . ~ . . , : ,, : '. ' . . : , ~98~
receive flushing water for the electrodes. At the upper and lower parts of the frame are also attached support plates 43 making the construction more rigid. At the bottom of each trough 42 are provided a plurality of flow openings 44, evenly spaced along the trough. Through these openings pass thin strings or wires, preferably of metal, to form the electrodes 45. The openings 44 are of greater diameter than the diameter of the strings, thus allowing the water to flow downwards through the holes and along the strings towards the basin 36. In addition to the string-formed electrodes there arè
also mounted plate-formed electrodes 46 on the frame 40. The plate-formed electrodes 46 are preferably made of net sheet as in the embodiment of Figs. 5 ... .
and 6 and are also coated with insulating material.
The troughs 42 on the upper part of the electrode frames act as channels for the flush liquid as hereinbefore described. In the present embodiment, the adjacent troughs are not connected with each other by means of overflow tubes, but there is formed an overflow lip 47 at the central region of an edge of` each tr-ough by bending the edge partially outwardly and downwardly. When the electrode frames are now mounted into the casing, the first frame is set in place and ther; the following elements are located so that the lip 47 of each successive frame rests against the edge of the preceding frame. Now, when water flows through the hose 38 into the highest trough (see Fig. 7), the excess water will then flow through the lip into the following frame and so forth, so that all the frames may receive flushing water for the electrodes.
From the~last frame at the left in Fig. 7, the e~cess w8ter flows into the~
channel 48 and then further into the basin 36.
~ The edge parts of the troughs 42 of the bottom of the frames are bent in the same way as the upper troughs. Thus the frames will support each other by means of this special feature. This construction is also very useful, because the frames can be mounted in place no matter which end is facing . ,~'~ . .
, .
: ~ ' ' ' ' '-- : ' z downwardly or upwardly. The walls of the casing can be provided with suitable rests or guides, supporting the frames in place.
According to the embodiment of Figs. 11 and 12, the plate electrodes in the frame-element may also consist of a plurality of metal sheet strips 49 which are connected together in batches and mounted between the said string-formed electrodes.
Thus, the invention provides a device wherein the electrode elements are very easy to clean and maintain, and provide for a simple and economical construction. Various sizes of dust precipitators can be manufactured using 10 only a few sizes of electrode elements.
. . .
: ' .
- , , . .. ~ .
i ~,. .. .
.
-.
:. .: , . : . ,, : , . ,. . :
.
, . .
.
' ~ ig. 3 is a f`ront view of one electrode of` a device according to the invention;
Fig. 4 is a side view of the electrode of Fig. 3;
Fig. 5 is a section on the line A-A of Fig. 1, showing a negative electrode plate;
Fig. 6 is an enlarged detailed view of the construction of the negative electrode plate shown in Fig. 5;
Fig. 7 is a side view, partly in section, of another embodiment of a dust precipitator according to the invention;
Fig. 8 is a front view of the device of Fig. 7;
.~ ,, .
Fig. 9 is a plan view of an electrode unit used in the device of Fig. 7;
Fig. 10 is a side view, partly in section, of the unit shown in Fig. 8;
Fig. 11 is a plan view of an alternative embodiment of the electrode unlt used in the device of Fig. 7; and Fig. 12 is a side view, partly in section~ of the unit shown in Fig. 10.
The principle of` an electrostatic dust preclpitator according to the invention is illustrated in Fig. 1, in which A and B are electrodes shown in cross-section. A is a negative plate electrode and B a positive string or rod electrode. Connected across the electrodes is a relatively high voltage of some kilovolts, which creates an electrostatic field between the electrodes.
When partlcle C is carried~by streaming air lnto this field, it is converted into an electric dipole and begins to move in the direction where the field .
strength is highest, in this case towards string B. Since, according to this invention, the string is formed ~y a jet or thin stream of fluid, the particle is carried away by it. Therefore, the air is not ionized to charge with :
~ electricity the particle to be removed~and no electric discharge is produced.
.
Referring to Figs. 2 to 6, a device according to the inventlon consists~of boxLike~frame l, most suitably of square or rectangular shapè. Top 2 of the '. ~ .
`' ~ , ' '~ , ' s~
boxlike frame is open and may be fitted with an openable lid for inspection and maintenance. Both ends are also open~ An opening in the end wall 3 is provided with air filter 4, in itself of known construction, and in the opposite end wall 5 there is fitted a fan 6 which causes air to fIow through the precipitator. Of course it is possible to provide the openings with suitable grilles or lattices which, without preventing the flow of air, protect the parts inside and are openable to make maintenance possible. The box:Like frame is most suitably made of appropriate plastic material for electrical insulation purposes. The bottom of the boxlike frame comprises a basin 7 for holding liquids and, under the frame, legs 8.
.. ., ~
Positive and negative electrodes 10 and 11 are arranged alternately and successively in the space 9. Positive electrodes 10 (Figs. 3 and 4) consists of a frame 12, with a liquid trough 13 or the like thereupon. lhe bottom of trough 13 is provided with srnall flow openings 14 arranged adjacent to one another and through the openings pass thin strings 15, the upper ends of which are fastened to a bar running along the middle of the trough and the lower ends to the~bottom part of the frame. The purpose of the strings is to act as guides for the flow of liquid. Water or some other liquid from the trough 13 runs along these strings. Oil is appropriate on account of its being non-conductive and therefore making lt easier to insulate the body of the devlce. If the liquid is non-conductive, the guide string has~to be of some ~
concluctive material such as metal. In the middle of the electrode frame there is provided an overflow pipe 17 for preventing the trough from being excessively filled. The troughs of individual electrodes are furthermore connected to each other by means of a connecting pipe 18, which keeps the fluid in all troughs at the same level. The inside surface of the boxlike frame of the device may be provided with slots into which the electrodes are pushed so that they take their correct position. Intermediate plates 19 .`?
'' ".' '. ' , :~ '' ' ' ', : ~ :
,. ,, , ' : , , separate the electrodes from each other and support them. The electrodes are, however, electrically connected with each other, e.g. by means of connecting pipe 18, which may be electrically conductive. The lower ends of electrodes 10 reach below the liquid level in basin 7. The precipitator is provided with pump 20 for pumping liquid from basin 7 to trough 13 when the precipitator is working and from trough 13 the liquid flo~s continuously down the strings 15.
The bottom of the basin is provided with a filterl the purpose of which is to collect impurities from the liquid in the basin, the filter being of replaceable or cleanable type.
Negative electrodes 11 are in the form of wire-net sheet (Figs. 5 and 6) .~ ~. .
or fine-mesh honeycomb plates so as to allow the air stream to pass through them. Plates 11 may also be solid plates without any hcles, provided that the alr flow is parallel to them. Plates 11 rnay also be coated with some electrically insultating material to prevent electric discharge between the electrodes. Most appropriately they are also fitted into the s]ots that are formed into the inside walls of the boxlike frame, such slots being provided with restrictors to prevent them from reachin~ down to the surface of the liquid in basin 7. The basin is provided witll transverse partitions directly below the electrodes; however, the partitions do not divide the basin into ; 20 totally separate sections.
To operate the precipitator, poles 22 of a voltage supply in excess of 4 kv are connected to the electrodes, and the pump and the fan are started. As voltage builds up in the electrodes and the flcw of the air to be cleaned passes through the precipitator, the unlike electric chargès of minute dust and other particles in the air separate and the particles become electric dipoles, as described above. The particles move to the string electrodes formed by the liquid stream, the stream then carrying the particles away and the alr becoming thus effectively cleaned. The poles of the voltage supply .
, : ' ., . ' . : :
'' '"' ' , ' ", " :' ' :
, 3L~ S2 can be reversed, and one of the two electrodes, e.g. the liquid stream, can even be grounded, if desired. Regardless of polarity, the direction of movement of the particles in the field remains the same, i.e. towards the stringlike electrode.
Ordinary tap-water is suitable for use in the precipitator, because tap-water contains enough salts to make the water electrically conductive. Of course, other liquids may also be used. If the flowing liquid is non-conductive the guide strings must be of some conductive material.
Figs. 7 to 12 illustrate a preferred embodiment of the invention. The device has a housing 30, preferably of plastic material. In the front wall 31 ~ . ,.
of the housing is an opening 32, through which air to be cleaned enters the device. In the opening 32 is attached a fan 33, which blows the air through the space 34 and the electrostatic elements attaohed within this space. The air is exhausted through another opening 35 at the opposite end. On the bott;om of the device there lS provided a basin 36 receiving the ~lushing water together with dust partlcles, flowing down from the electrode elements.
Communicating with the basin 36 is a pump 37 having a driving motor and filter. The filter prevents the dust particles from coming back into the elements together with the water which is pumped again back into the troughs along the upper part of the electrode elements through a hose 38. Only a `~ ~ low-powered pump is required for this purpose, because the amount of water requlred is quite small. The devioe is also provided with a voltage source, e.g. a voltage transformer 39, which transforms the supplied voltage into the operating voltage of about 4 kv.
The electrode elements (Figs. 9 to 12) of this embodiment comprise a rectangular frame 40 preferably made of plastic material. The frame 40 comprises vertical wall sides 41 and at the top and bottom are attached troughs 42. The upper troughs are open upwardly, thus forming channels to ~ , - -.
. . ~ . . , : ,, : '. ' . . : , ~98~
receive flushing water for the electrodes. At the upper and lower parts of the frame are also attached support plates 43 making the construction more rigid. At the bottom of each trough 42 are provided a plurality of flow openings 44, evenly spaced along the trough. Through these openings pass thin strings or wires, preferably of metal, to form the electrodes 45. The openings 44 are of greater diameter than the diameter of the strings, thus allowing the water to flow downwards through the holes and along the strings towards the basin 36. In addition to the string-formed electrodes there arè
also mounted plate-formed electrodes 46 on the frame 40. The plate-formed electrodes 46 are preferably made of net sheet as in the embodiment of Figs. 5 ... .
and 6 and are also coated with insulating material.
The troughs 42 on the upper part of the electrode frames act as channels for the flush liquid as hereinbefore described. In the present embodiment, the adjacent troughs are not connected with each other by means of overflow tubes, but there is formed an overflow lip 47 at the central region of an edge of` each tr-ough by bending the edge partially outwardly and downwardly. When the electrode frames are now mounted into the casing, the first frame is set in place and ther; the following elements are located so that the lip 47 of each successive frame rests against the edge of the preceding frame. Now, when water flows through the hose 38 into the highest trough (see Fig. 7), the excess water will then flow through the lip into the following frame and so forth, so that all the frames may receive flushing water for the electrodes.
From the~last frame at the left in Fig. 7, the e~cess w8ter flows into the~
channel 48 and then further into the basin 36.
~ The edge parts of the troughs 42 of the bottom of the frames are bent in the same way as the upper troughs. Thus the frames will support each other by means of this special feature. This construction is also very useful, because the frames can be mounted in place no matter which end is facing . ,~'~ . .
, .
: ~ ' ' ' ' '-- : ' z downwardly or upwardly. The walls of the casing can be provided with suitable rests or guides, supporting the frames in place.
According to the embodiment of Figs. 11 and 12, the plate electrodes in the frame-element may also consist of a plurality of metal sheet strips 49 which are connected together in batches and mounted between the said string-formed electrodes.
Thus, the invention provides a device wherein the electrode elements are very easy to clean and maintain, and provide for a simple and economical construction. Various sizes of dust precipitators can be manufactured using 10 only a few sizes of electrode elements.
. . .
: ' .
- , , . .. ~ .
i ~,. .. .
.
-.
:. .: , . : . ,, : , . ,. . :
.
Claims (13)
IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An electrostatic dust precipitator of the wet type, comprising a frame having an inlet for the medium to be cleaned, an outlet for the medium after cleaning, a fan intermediate the outlet and the outer portion of the frame for causing the medium to flow through the electrostatic dust precipitator wherein, within said frame are positioned electrically connected alternate positive and negative electrodes, said positive electrodes being string or rod electrodes, said negative electrodes being plate electrodes; a high voltage source connected to the electrodes; means for causing a flushing fluid to wash down the string electrodes in a direction perpendicular to the flow of the medium being cleaned, a basin at the bottom of the frame for catching the flushing fluid and a pump for pumping the flushing fluid to the means for causing said fluid to wash down the string electrodes.
2. The precipitator of claim 1, wherein said means is a trough at the top of the frame having holes in the bottom thereof and string electrodes hanging down from said holes.
3. The precipitator of claim 1, wherein said electrodes are adjacent and behind each other.
4. The precipitator of claim 1, wherein the voltage is limited so it will not cause any corona discharge.
5. The precipitator of claim 1, wherein said plate electrodes are sheets of net.
6. The precipitator of claim 1, wherein said plate electrodes are metal plates.
7. The precipitator of claim 1, wherein said plate electrodes are coated with an electrical insulator.
8. The precipitator of claim 1, wherein said electrodes are several pair in number and are in a substantially linear arrangement.
9. The precipitator of claim 1, further provided with a filter fitted to said basin for cleaning the flushing liquid.
10. The precipitator of claim 2, wherein said troughs are provided with an overflow pipe.
11. The precipitator of claim 2, further comprising a connecting pipe between said troughs.
12. The precipitator of claim 1, wherein said medium inlet has a filter.
13. The precipitator of claim 1, wherein said plate electrodes consist of sheet strips situated between said string electrodes.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI771757A FI56776C (en) | 1977-06-02 | 1977-06-02 | ELEKTROSTATISK STOFTAVSKILJARE |
| FI771757 | 1977-06-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1098052A true CA1098052A (en) | 1981-03-24 |
Family
ID=8510881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA304,475A Expired CA1098052A (en) | 1977-06-02 | 1978-05-31 | Dust precipitator |
Country Status (16)
| Country | Link |
|---|---|
| JP (1) | JPS542578A (en) |
| AT (1) | AT361584B (en) |
| AU (1) | AU3671678A (en) |
| CA (1) | CA1098052A (en) |
| DD (1) | DD136801A1 (en) |
| DE (1) | DE2823971A1 (en) |
| DK (1) | DK244978A (en) |
| ES (1) | ES470409A1 (en) |
| FI (1) | FI56776C (en) |
| FR (1) | FR2392723A1 (en) |
| GB (1) | GB1600232A (en) |
| IN (1) | IN148737B (en) |
| IT (1) | IT1105309B (en) |
| NL (1) | NL7806055A (en) |
| NO (1) | NO781843L (en) |
| SE (1) | SE7806075L (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6106592A (en) * | 1998-03-17 | 2000-08-22 | Monsanto Company | Wet electrostatic filtration process and apparatus for cleaning a gas stream |
| CN105498970A (en) * | 2016-02-21 | 2016-04-20 | 重庆科技学院 | Frictional electrostatic dust removal device and method |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI61815C (en) * | 1980-07-15 | 1982-10-11 | Arvi Artama | ELECTRIC FILTER |
| US4553987A (en) * | 1982-03-11 | 1985-11-19 | Lastro Ky | Continuously rinsed electric dust collector |
| JPS58172510A (en) * | 1982-04-05 | 1983-10-11 | Hoya Corp | Binocular capable of indicating distance |
| GB2126130B (en) * | 1982-09-02 | 1986-09-03 | Nat Res Dev | Removal of ions from charged powder clouds |
| JPS60181714U (en) * | 1984-05-11 | 1985-12-03 | 門倉 貞芳 | binocular focus adjustment device |
| US7297182B2 (en) | 2005-03-02 | 2007-11-20 | Eisenmann Corporation | Wet electrostatic precipitator for treating oxidized biomass effluent |
| US7318857B2 (en) | 2005-03-02 | 2008-01-15 | Eisenmann Corporation | Dual flow wet electrostatic precipitator |
| DE102008046413B4 (en) * | 2008-09-04 | 2016-03-31 | Eisenmann Se | Device for separating paint overspray |
| JP5879470B2 (en) * | 2010-01-18 | 2016-03-08 | パナソニックＩｐマネジメント株式会社 | Dust collector |
| DE102012023554A1 (en) | 2012-12-01 | 2014-06-05 | Eisenmann Ag | Separator unit for use in an overspray separator |
| KR102366179B1 (en) * | 2019-08-23 | 2022-02-22 | 세메스 주식회사 | Transger unit and apparatus for treating substrate with the transfer unit |
-
1977
- 1977-06-02 FI FI771757A patent/FI56776C/en not_active IP Right Cessation
-
1978
- 1978-05-26 SE SE7806075A patent/SE7806075L/en unknown
- 1978-05-26 NO NO781843A patent/NO781843L/en unknown
- 1978-05-29 AT AT389578A patent/AT361584B/en not_active IP Right Cessation
- 1978-05-30 GB GB24135/78A patent/GB1600232A/en not_active Expired
- 1978-05-31 AU AU36716/78A patent/AU3671678A/en active Pending
- 1978-05-31 CA CA304,475A patent/CA1098052A/en not_active Expired
- 1978-06-01 DE DE19782823971 patent/DE2823971A1/en not_active Withdrawn
- 1978-06-01 DK DK244978A patent/DK244978A/en not_active Application Discontinuation
- 1978-06-01 FR FR7816413A patent/FR2392723A1/en active Granted
- 1978-06-01 JP JP6499178A patent/JPS542578A/en active Pending
- 1978-06-01 ES ES470409A patent/ES470409A1/en not_active Expired
- 1978-06-02 NL NL7806055A patent/NL7806055A/en not_active Application Discontinuation
- 1978-06-02 IT IT49682/78A patent/IT1105309B/en active
- 1978-06-02 DD DD78205760A patent/DD136801A1/en unknown
- 1978-06-06 IN IN620/CAL/78A patent/IN148737B/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6106592A (en) * | 1998-03-17 | 2000-08-22 | Monsanto Company | Wet electrostatic filtration process and apparatus for cleaning a gas stream |
| CN105498970A (en) * | 2016-02-21 | 2016-04-20 | 重庆科技学院 | Frictional electrostatic dust removal device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| FI56776B (en) | 1979-12-31 |
| ATA389578A (en) | 1980-08-15 |
| IT7849682A0 (en) | 1978-06-02 |
| IN148737B (en) | 1981-05-30 |
| GB1600232A (en) | 1981-10-14 |
| SE7806075L (en) | 1978-12-03 |
| DK244978A (en) | 1978-12-03 |
| IT1105309B (en) | 1985-10-28 |
| FI56776C (en) | 1980-04-10 |
| AT361584B (en) | 1981-03-25 |
| NL7806055A (en) | 1978-12-05 |
| AU3671678A (en) | 1979-12-06 |
| FR2392723A1 (en) | 1978-12-29 |
| DD136801A1 (en) | 1979-08-01 |
| ES470409A1 (en) | 1979-01-16 |
| FR2392723B3 (en) | 1981-01-30 |
| DE2823971A1 (en) | 1978-12-14 |
| JPS542578A (en) | 1979-01-10 |
| NO781843L (en) | 1978-12-05 |
| FI771757A (en) | 1978-12-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |