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
  • B03C3/34—Constructional details or accessories or operation thereof
  • B03C3/74—Cleaning the electrodes
  • B03C3/78—Cleaning the electrodes by washing
• • 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
• • 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
  • B03C3/34—Constructional details or accessories or operation thereof
  • B03C3/40—Electrode constructions
  • B03C3/45—Collecting-electrodes
  • B03C3/53—Liquid, or liquid-film, electrodes
• • 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
  • B03C3/34—Constructional details or accessories or operation thereof
  • B03C3/40—Electrode constructions
  • B03C3/60—Use of special materials other than liquids

Definitions

• the object of the invention is a so-called electric filter, the purpose of which is to separate from air or other gas small solid particles by means of an electrostatic method known as such, and which is of such type as is specified more exactly in the introduction to patent claim 1.
• Other particles may bounce off the dry electrode when they exchange their original electric charge for that of the collection electrode. Continuous rinsing of the collection electrode may not be practicable due to complete coverage of the electrode not being attainable with moderate water consumption A layer of particles then gathers on the dry portions and causes a short circuit.
• quartz dust and carbon dust may bounce off the dry electrode when they exchange their original electric charge for that of the collection electrode. Continuous rinsing of the collection electrode may not be practicable due to complete coverage of the electrode not being attainable with moderate water consumption A layer of particles then gathers on the dry portions and causes a short circuit.
• the purpose of the invention is to produce an electric filter from which the aforementioned drawbacks have been removed.
• This continuous rinsing of the filter collection plate is carried out completely with comparatively low water consumption resulting in all types of solid particles over the whole electrode area being carried away by the flowing water film and removed with it from the electric field.
• the invention is characterized by the fact that the impure particle collection plates situated in the electrostatic field are made of glass or corresponding material which is wetted by water. In this way the rinsing water is caused to spread with great effectiveness over the surface of the plate and cover it completely yet in a thin layer. The water film thus acts as an electrode, since the glass does not conduct electricity.
• Figure 1 shows diagrammatically the electric filter according to the invention seen from the side, partly sectioned
• Figure 2 shows diagrammatically a horizontal cross-section of the electric filter along A-A in figure 1.
• the figure also shows a circuit diagram of the electrical connections
• Figure 3 shows diagrammatically a vertical cross—section of the electric filter along B-B in figure 1
• FIG. 4 shows in part the ionisation electrodes enlarged of the electric filter.
• the electric filter shown in figures 1-4 includes a supporting case 1.
• the intake opening 2 for the air to be cleaned is at one end of the case and the output opening 3 for the cleaned air is at the opposite end.
• an electrically driven fan 4 which draws air in via the input opening 2 and then through the filter.
• the fan may also be placed together with the input opening, in which case it blows air through the filter.
• the case is also provided with an openable cover 5. through which the electrical equipment and other parts inside the case may be serviced.
• a sump 6 into which the filter rinsing water flows.
• an ionisation device which ionises the air in a known manner.
• the device is a group of positive ionisation electrodes in a construction known as such, which in this embodiment are attached to a rectangular supporting frame 7 for example to supporting heads 8 in the upper and lower frame members.
• the electrodes 9 are thick metal wire, for exampl tungsten wire.
• the other electrode group of the ionisation device is formed by the group 10 negative counter-electrod which are attached to another frame 11 between its upper and lower members in a vertical row with equal spacing.
• Electrodes 10 are materially thicker in cross-section made for example from stainless steel wire, which is coiled in the form of a helical spring (figures 2 and 4) . Both electrode groups are fitted so for example that they are situated in the same row parallel and at equal intervals, thinner electrodes alternating with thicker ones (figures 2 and 4) . The electrodes may naturally also be situated grouped in successive rows longitudinally along the filter. According to the invention the construction of the elec trodes is further special in that the said electrodes 10 are continuously rinsed with a water current so that charged dust particles possibly striking them do not remain attached but are washed off. The electrodes thus remain clean and the ionisation device functions without fault.
• a water channel or pipe into holes (not shown in the figure) in the base of which the electrodes are placed, loosely fitting, so that water can run through the holes downwards onto the electrodes.
• electrodes in the form of a helical spring there may also be used. some kind of corresponding thick metal braid, chain, or wire rope.
• the air current from the above mentioned ionisation device goes to the filter electrostatic field, which is formed of a group of parallel plate electrodes 13 , 14 placed vertically relative to the direction of the air current. Of these each alternate plate 13 is connected to the positive pole of the voltage supply, and each other plate 14 to the negative. Solid particles acquiring a positive charge from the ionisation device travel to the negative collection electrode 14.
• the said negative collection plates 14 are made of glass or corresponding material.
• a continuous rinsing of them is arranged. Water comes to the collection plate 14 from parts such as the pipes 15 which are placed near to the upper edge of the plates and running in the same direction as the edge.
• small nozzle holes are made at equal intervals to the pipes 15, so that water jets are directed from the pipes 15 slantingly downwards to the side surfaces of the. said glass plates at their upper edge in the form of numerous fine sprays.
• Another possible embodiment is to arrange the water distribution to the glass plate through narrow downward directed apertures in the direction of length of the pipe 15. The water then spreads as a thin even film over the surface of the glass plate, so that ther remain no dry, unrinsed points which would weaken the cleansing ability of the filter.
• the positive electrodes 13 on the other hand may be mad for example from stainless steel and do not need to be rinsed since the dust particles only accumulate on the collection electrode 14.
• the body of the device is earthed and the negative pole of the supply is connected to the earth lead, to which is also connected the negative electrodes 10 of the ionisation device and the pipes 15, which are therefore metal or contain conductive parts through which electricity is conducted to the rinsing water.
• the positive terminal of the supply is connected to the positive ionisation electrodes 1 of the ionisation device and similarly the plates forming the electrostatic field are connected to the positive plate electrodes 13.
• water conductivity may be improved by the addition of some suitable salt.
• the rinsing water may be led directly to a drain together with the accumulated impurities. It may also be arrange in a closed circuit, in which the dust is separated fro the water by means of a suitable filter.
• the constructional parts of the device such as the ionisation device, the electrode groups and the electro static field electrodes etc. may be arranged so as to be easily removable and exchangeable in order to facilitate maintenance.
• the embodiment of the device may vary within the patent claims.

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• Electrostatic Separation (AREA)
• Filtering Materials (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8513628

Family Applications (1)

Country Status (14)

Cited By (3)

Families Citing this family (4)

Citations (7)

Family Cites Families (2)

• 1980
  • 1980-07-15 FI FI802245A patent/FI61815C/fi not_active IP Right Cessation
• 1981
  • 1981-07-06 CH CH1650/82A patent/CH659006A5/de not_active IP Right Cessation
  • 1981-07-06 WO PCT/FI1981/000053 patent/WO1982000259A1/en active Application Filing
  • 1981-07-06 JP JP56502586A patent/JPS57501170A/ja active Pending
  • 1981-07-06 NL NL8120285A patent/NL8120285A/nl unknown
  • 1981-07-06 GB GB8218748A patent/GB2098509B/en not_active Expired
  • 1981-07-06 DE DE813152216T patent/DE3152216T1/de active Granted
  • 1981-07-06 AT AT0908781A patent/AT382526B/de not_active IP Right Cessation
  • 1981-07-08 CS CS815236A patent/CS243462B2/cs unknown
  • 1981-07-15 FR FR8113747A patent/FR2486823A1/fr active Granted
  • 1981-07-15 DD DD81231805A patent/DD206942A1/de not_active IP Right Cessation
• 1982
  • 1982-03-11 NO NO82820783A patent/NO157087C/no unknown
  • 1982-03-12 DK DK109382A patent/DK109382A/da not_active Application Discontinuation
  • 1982-08-05 SE SE8204590A patent/SE435140B/sv not_active IP Right Cessation

Patent Citations (7)

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