WO1995003986A1 - Method for preventing the spreading of material particles into the environment due to dust-formation, fuming or steamdrop-formation in belt, screw, vibrator, drag or other open transport - Google Patents

Method for preventing the spreading of material particles into the environment due to dust-formation, fuming or steamdrop-formation in belt, screw, vibrator, drag or other open transport Download PDF

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Publication number
WO1995003986A1
WO1995003986A1 PCT/FI1994/000334 FI9400334W WO9503986A1 WO 1995003986 A1 WO1995003986 A1 WO 1995003986A1 FI 9400334 W FI9400334 W FI 9400334W WO 9503986 A1 WO9503986 A1 WO 9503986A1
Authority
WO
WIPO (PCT)
Prior art keywords
transported
formation
ion
ion yield
belt
Prior art date
Application number
PCT/FI1994/000334
Other languages
French (fr)
Inventor
Veikko Ilmasti
Original Assignee
Roxon Oy
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Roxon Oy filed Critical Roxon Oy
Priority to AU72638/94A priority Critical patent/AU7263894A/en
Publication of WO1995003986A1 publication Critical patent/WO1995003986A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B6/00—Cleaning by electrostatic means
    • 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
    • B03C3/41—Ionising-electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B17/00—Methods preventing fouling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G69/00—Auxiliary measures taken, or devices used, in connection with loading or unloading
    • B65G69/18—Preventing escape of dust
    • B65G69/185—Preventing escape of dust by means of non-sealed systems

Definitions

  • the object of this invention is a method for preventing the migration of material particles into the air from the material during belt conveyance or corresponding material transport.
  • Belt conveyors are used for material transport in many places.
  • the materials to be transported often include: coal, different rock materials, wheat, fertilizers, salt, ash, puritan filler, different industrial chemicals, etc.
  • Conveyor lines and corresponding transport methods comprise an open upper part thereof. Due to the open structure it has not been possible to prevent environmental hazards caused by belt conveyors, with official regulations, but air pollution which cause health hazards have been spread to the surroundings during transport, mainly in the form of particles. The most common hazard is contamination of the environment which has caused suffering to both plants and the landscape.
  • Belt conveyors which are permanently in the same place have been provided with a tubular or other corresponding structural forms to be sealed in order to prevent the spreading of dust and other ingredients into the surroundings. A drawback in many cases is the maintenance.
  • a completely sealed structure should be so dimensioned that it endures the steps of a service man and the entire belt conveyor system as an economical investment may be too expensive to implement.
  • With respect to permanent conveyors it is possible to use the above-mentioned encapsulation of the conveyor with related difficulties.
  • the method according to the invention is characterized in that ion yield tips are placed above the material to be transported in such a manner that an intensive ion field is provided over the material being transported.
  • the conveyor structures are grounded.
  • the material being transported can be grounded with the aid of an earth drag, for instance.
  • the intensive ion field above and the grounded transport material cause the dust, droplets or other ingredients breaking loose from the transport material to become electrically charged in the ion field while trying to become detached from the transported material and return back to the material being transported.
  • the voltage level of the ion yield tip and its distance to the material being transported the vertex of the detachment of the material particles from the material is about 2 mm - 30 mm before returning to the source material.
  • An embodiment of the invention is characterized in that ion yield tips are installed to a high tension cable.
  • the high tension cable is installed above the belt conveyor so that ion yield tips are installed to the lower surface of the cable.
  • the distance between the tips are determined by the voltage used and the distance of the tips from the transport material. In practice, the smallest possible voltage to provide the protection is preferred. For instance, if the voltage of the ion tips is about 50 kV and the distance from the tips to the material to be protected is about 50 cm, a suitable distance between the ion tips would be about 50-70 cm.
  • the model of the invention which gives more protection against atmospheric conditions is a load-bearing supporting structure extending along the whole length of the conveyor in question, giving support through insulating intermediate parts to both the protecting roof structure and the ion yield tips.
  • the above embodiments can be used in connection with both permanent conveyors and those continuously moved.
  • the structures of the invention are simple and light-weight.
  • the high voltage can be provided by a 12 V supply voltage, whereby a 12 V car battery can be used as the source of reserve power.
  • the need for energy is extremely low. For instance, a conveyor of 0.5 m of width and 20 m of length requires about 10-20 W for the protection.
  • Fig. l represents a cross section of the protection in a simple form
  • Fig. 2 represents a longitudinal section of the protection in a simple form
  • Fig. 3 represents a cross section of the structure regarding atmospheric conditions
  • Fig. 4 represents a longitudinal section of the structure regarding atmospheric conditions
  • Fig. 5 represents the impact of the ion protective field on the material being transported
  • Fig. 6 represents a belt conveyor provided with the prevention of detachment of material particles according to the invention.
  • the equipment used in the method is comprised of ion field 2 which protects material 1 to be transported, the ion field being provided by ion yield tips 3.
  • Ion yield tips 3 are installed above surface 1 of the material to be transported, generally in form of a row, so that the ion beams coming from the ion yield tips cover the material being transported.
  • the required high voltage for ion yield tips 3 is provided by a high voltage source from which it is conducted using high voltage cable 4 along the area above area 1 to be protected, in accordance with one of the most simple modes.
  • Conveyor belts 5 or other low loaders and the supporting structures are grounded.
  • Protective structure 6 of the ion yield tips can be built from insulating material, as shown in Fig. 3.
  • the light-weight high voltage cable can be supported using tubular, wire rope 7 or other structures.
  • Fig. 5 shows by arrows the detachment of material particles and the return thereof to the surface of the material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Elimination Of Static Electricity (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Abstract

The invention relates to a method for preventing the spreading of material particles (1) into the environment due to dust-formation, fuming or steamdrop-formation during belt (5), screw, vibrator, drag or other open transport. Ion yield tips (3) are used above the open conveying means so that an intensive ion field (2) is provided above the surface of the conveying means.

Description

METHOD FOR PREVENTING THE SPREADING OF MATERIAL PARTICLES INTO THE ENVIRONMENT DUE TO DUST-FORMATION, FUMING OR STEAMDROP- FORMATION IN BELT, SCREW, VIBRATOR, DRAG OR OTHER OPEN TRANSPORT.
The object of this invention is a method for preventing the migration of material particles into the air from the material during belt conveyance or corresponding material transport.
Belt conveyors are used for material transport in many places. The materials to be transported often include: coal, different rock materials, wheat, fertilizers, salt, ash, puritan filler, different industrial chemicals, etc. Conveyor lines and corresponding transport methods comprise an open upper part thereof. Due to the open structure it has not been possible to prevent environmental hazards caused by belt conveyors, with official regulations, but air pollution which cause health hazards have been spread to the surroundings during transport, mainly in the form of particles. The most common hazard is contamination of the environment which has caused suffering to both plants and the landscape. Belt conveyors which are permanently in the same place have been provided with a tubular or other corresponding structural forms to be sealed in order to prevent the spreading of dust and other ingredients into the surroundings. A drawback in many cases is the maintenance. A completely sealed structure should be so dimensioned that it endures the steps of a service man and the entire belt conveyor system as an economical investment may be too expensive to implement. In practice, accidents happen, especially at long transport distances, in which the material to be transported such as coal begins to fall off the conveyor belt because of damage and begins to fill the protective structure. This results in stoppage of the transport system and environmental hazards because the blocked part is often emptied to be repaired, by dropping the accumulated material down. With respect to permanent conveyors it is possible to use the above-mentioned encapsulation of the conveyor with related difficulties.
When it comes to general, transportable belt conveyors which continuously need to be transported, sealed structures cannot be applied. It is obvious that dust-formation, for instance, when using belt conveyors in harbors, factories, in processing of stone material, etc., cannot be prevented very easily. The most frequently used method to prevent dust-formation is to wet the transported material. Wetting cannot be applied to anywhere near all the transferred materials. Other preventive methods for belt conveyors are not available on the market for preventing environmental hazards. The purpose of the invention is to eliminate the above drawbacks.
The method according to the invention is characterized in that ion yield tips are placed above the material to be transported in such a manner that an intensive ion field is provided over the material being transported. The conveyor structures are grounded. The material being transported can be grounded with the aid of an earth drag, for instance. The intensive ion field above and the grounded transport material cause the dust, droplets or other ingredients breaking loose from the transport material to become electrically charged in the ion field while trying to become detached from the transported material and return back to the material being transported. Depending on the quality and moisture of the transported material, the voltage level of the ion yield tip and its distance to the material being transported, the vertex of the detachment of the material particles from the material is about 2 mm - 30 mm before returning to the source material.
An embodiment of the invention is characterized in that ion yield tips are installed to a high tension cable. In its simplest use, the high tension cable is installed above the belt conveyor so that ion yield tips are installed to the lower surface of the cable. The distance between the tips are determined by the voltage used and the distance of the tips from the transport material. In practice, the smallest possible voltage to provide the protection is preferred. For instance, if the voltage of the ion tips is about 50 kV and the distance from the tips to the material to be protected is about 50 cm, a suitable distance between the ion tips would be about 50-70 cm.
The model of the invention which gives more protection against atmospheric conditions is a load-bearing supporting structure extending along the whole length of the conveyor in question, giving support through insulating intermediate parts to both the protecting roof structure and the ion yield tips. The above embodiments can be used in connection with both permanent conveyors and those continuously moved. The structures of the invention are simple and light-weight. The high voltage can be provided by a 12 V supply voltage, whereby a 12 V car battery can be used as the source of reserve power. The need for energy is extremely low. For instance, a conveyor of 0.5 m of width and 20 m of length requires about 10-20 W for the protection.
The invention is described in the following with the aid of an example with reference to the appended drawings in which:
Fig. l represents a cross section of the protection in a simple form,
Fig. 2 represents a longitudinal section of the protection in a simple form,
Fig. 3 represents a cross section of the structure regarding atmospheric conditions, Fig. 4 represents a longitudinal section of the structure regarding atmospheric conditions,
Fig. 5 represents the impact of the ion protective field on the material being transported,
Fig. 6 represents a belt conveyor provided with the prevention of detachment of material particles according to the invention.
The equipment used in the method is comprised of ion field 2 which protects material 1 to be transported, the ion field being provided by ion yield tips 3. Ion yield tips 3 are installed above surface 1 of the material to be transported, generally in form of a row, so that the ion beams coming from the ion yield tips cover the material being transported. The required high voltage for ion yield tips 3 is provided by a high voltage source from which it is conducted using high voltage cable 4 along the area above area 1 to be protected, in accordance with one of the most simple modes.
Conveyor belts 5 or other low loaders and the supporting structures are grounded. Protective structure 6 of the ion yield tips can be built from insulating material, as shown in Fig. 3. The light-weight high voltage cable can be supported using tubular, wire rope 7 or other structures.
Fig. 5 shows by arrows the detachment of material particles and the return thereof to the surface of the material.

Claims

1. A method for preventing material particle emissions to the surrounding airspace during transport from the material (1) to be transported by belt, screw, vibrator, drag or corresponding material conveyors, c h a r a c t e r i z e d in that ion yield tips (3) are used above (2) the material transported by the conveyors so that an intensive ion field is provided in which ionic currents travel from the ion yield tips to the material being transported.
2. A method according to Claim 1, c h a r a c t e r i z e d in that the ion yield tips (3) are placed in the form of a row above (2) the material transported by the conveyors in the direction of the hauling track, the number of the ion yield tips corresponding to the receiving surface of the ions covering the material being transported.
3. A method according to Claim 1 or 2, c h a r a c t e r i z e d in that the ion yield tips are protected (6) against external conditions by the way presented in Figs. 3 and 4, for instance.
4. A method according to any of the preceding Claims, c h a r a c t e r i z e d in that the ion yield tips (3) are placed at a distance of 10 - 150 cm from the upper surface of the transported material.
5. A method according to any of the preceding Claims, c h a r a c t e r i z e d in that a voltage of 6 - 150 kV is supplied to the ion yield tips (3).
PCT/FI1994/000334 1993-08-02 1994-08-02 Method for preventing the spreading of material particles into the environment due to dust-formation, fuming or steamdrop-formation in belt, screw, vibrator, drag or other open transport WO1995003986A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU72638/94A AU7263894A (en) 1993-08-02 1994-08-02 Method for preventing the spreading of material particles into the environment due to dust-formation, fuming or steamdrop-formation in belt, screw, vibrator, drag or other open transport

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI933446 1993-08-02
FI933446A FI96760C (en) 1993-08-02 1993-08-02 Process for preventing the release of particles into the surrounding air space during transport from materials transported on belt, screw, vibration, tow and other conveyors

Publications (1)

Publication Number Publication Date
WO1995003986A1 true WO1995003986A1 (en) 1995-02-09

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ID=8538374

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1994/000334 WO1995003986A1 (en) 1993-08-02 1994-08-02 Method for preventing the spreading of material particles into the environment due to dust-formation, fuming or steamdrop-formation in belt, screw, vibrator, drag or other open transport

Country Status (3)

Country Link
AU (1) AU7263894A (en)
FI (1) FI96760C (en)
WO (1) WO1995003986A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108499734A (en) * 2018-04-11 2018-09-07 苏州建益森电子科技有限公司 A kind of computer cabinet inside dust pelletizing system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD109711A1 (en) * 1974-03-14 1974-11-12
SU1041444A1 (en) * 1982-04-19 1983-09-15 Пермский политехнический институт Device for suppressing dust on belt conveyor
SU1574828A1 (en) * 1988-02-29 1990-06-30 Белгородский технологический институт строительных материалов им.И.А.Гришманова Aspiration shelter place of loading loose material of belt conveyer
SU1657653A1 (en) * 1989-04-06 1991-06-23 Белгородский технологический институт строительных материалов им.И.А.Гришманова Aspiration shelter of belt conveyer loading station
FI88117B (en) * 1991-05-22 1992-12-31 Veikko Ilmasti REFERENCE TO A FOLLOWING EXTENSION FOR EXPLORATION OF AN EXHAUST SPRING FOR AERMESPARTIKLAR, SOM FOERS MED AONGDROPPARNA TILL OMG IVNINGEN

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD109711A1 (en) * 1974-03-14 1974-11-12
SU1041444A1 (en) * 1982-04-19 1983-09-15 Пермский политехнический институт Device for suppressing dust on belt conveyor
SU1574828A1 (en) * 1988-02-29 1990-06-30 Белгородский технологический институт строительных материалов им.И.А.Гришманова Aspiration shelter place of loading loose material of belt conveyer
SU1657653A1 (en) * 1989-04-06 1991-06-23 Белгородский технологический институт строительных материалов им.И.А.Гришманова Aspiration shelter of belt conveyer loading station
FI88117B (en) * 1991-05-22 1992-12-31 Veikko Ilmasti REFERENCE TO A FOLLOWING EXTENSION FOR EXPLORATION OF AN EXHAUST SPRING FOR AERMESPARTIKLAR, SOM FOERS MED AONGDROPPARNA TILL OMG IVNINGEN

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108499734A (en) * 2018-04-11 2018-09-07 苏州建益森电子科技有限公司 A kind of computer cabinet inside dust pelletizing system

Also Published As

Publication number Publication date
FI96760B (en) 1996-05-15
FI933446A0 (en) 1993-08-02
AU7263894A (en) 1995-02-28
FI933446A (en) 1995-02-03
FI96760C (en) 1996-08-26

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