WO2002076620A1 - Procede de separation electrostatique de particules, appareil de separation electrostatique de particules et systeme de traitement - Google Patents
Procede de separation electrostatique de particules, appareil de separation electrostatique de particules et systeme de traitement Download PDFInfo
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- WO2002076620A1 WO2002076620A1 PCT/JP2002/002878 JP0202878W WO02076620A1 WO 2002076620 A1 WO2002076620 A1 WO 2002076620A1 JP 0202878 W JP0202878 W JP 0202878W WO 02076620 A1 WO02076620 A1 WO 02076620A1
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- electrode
- electrostatic separation
- particles
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- bottom electrode
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- 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
- B03C3/04—Plant or installations having external electricity supply dry type
- B03C3/08—Plant or installations having external electricity supply dry type characterised by presence of stationary flat electrodes arranged with their flat surfaces parallel to the gas stream
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- 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
- B03C7/00—Separating solids from solids by electrostatic effect
- B03C7/02—Separators
- B03C7/04—Separators with material carriers in the form of trays, troughs, or tables
Definitions
- the present invention relates to an electrostatic separation method that can be used in the fields of recycling coal ash from coal-fired poilers, waste plastics, garbage, incineration ash, and other wastes, removing impurities from foods, and enriching minerals.
- the present invention relates to an electrostatic separation device. More specifically, the present invention relates to a method and an apparatus for sufficiently dispersing a raw material containing a mixture of conductive particles and insulating particles and efficiently separating the conductive particles and the insulating particles by electrostatic force generated by applying a high voltage.
- Japanese Patent Application Publication No. Hei 11-5099-134 discloses an insulating mesh conveyor belt that reciprocates between plate electrodes installed with a gap of several mm. A configuration is disclosed in which the positively charged unburned matter is collected on the negative pole side and the negatively charged ash is collected on the positive pole side by providing friction between the particles. In this technology, triboelectric charging is used. Also, Japanese Patent Publication No. 7-75687 discloses that dispersed coal ash is dropped on a grounded drum electrode to form insulating particles and conductive particles. And a technique for separating the two. In other words, ash (insulating particles) adhered to the rotating drum, and unburned components (conductive particles) were installed near the drum. By being attracted to the high voltage rod, the insulating particles and the conductive particles are separated. This technology uses induction charging.
- Japanese Patent Application Laid-Open No. 10-2352828 discloses that particles are charged by corona discharge, and the particles are allowed to freely fall between electrode plates to form insulating particles and conductive particles.
- a technique for separating is disclosed. It utilizes the fact that the fall trajectory differs due to the difference in the amount of charge of the particles.
- the technique disclosed in Japanese Patent Publication No. 7-75687 described above has no function of dispersing the powder attached to the rotating drum, and thus may cause a reduction in separation performance due to agglomeration.
- the amount of powder supplied to the drum is large, the thickness of the attached powder layer on the drum becomes large and the powder under the powder layer is prevented from moving by electrostatic force, so that the separation performance is reduced. Therefore, it is naturally difficult to increase the capacity because the processing amount is limited.
- the electrode in the vicinity of the drum is rod-shaped, the distance between the powder on the drum and the rod-shaped electrode is not uniform, and the electric field intensity varies depending on the distance, so that the distance from the portion where the distance is shortest is increased. As a result, the separation performance decreases, and especially in the case of fine powder, the separation performance decreases.
- the electrostatic separation method of the present invention is a method of separating a raw material of a granular material containing a conductive component and an insulating (non-conductive) component into respective components by static electricity.
- a voltage is applied between the substantially flat bottom electrode and the substantially flat mesh electrode having a large number of openings disposed above the bottom electrode, and one of the electrodes is a positive (+) electrode and the other is a positive (+) electrode.
- a DC electric field is generated between the bottom electrode and the mesh electrode using the negative electrode as the negative electrode to form a separation zone by electrostatic force, and the conductive component in the raw material supplied to this separation zone is converted to the mesh electrode. It passes through the opening and separates above the separation zone.
- the bottom electrode is a gas dispersion plate having gas permeability, and the gas for dispersion is introduced from the lower side of the gas dispersion plate. This is because the dispersibility of the raw materials is improved. In this case, it is preferable to previously dehumidify the dispersion gas. This is because consolidation and aggregation of the raw materials can be prevented. Further, since the separation zone has a dehumidified atmosphere, the applied voltage at the time of separation can be increased, and the separation performance can be improved.
- the bottom electrode and / or the mesh electrode it is preferable to apply vibration or impact to the bottom electrode and / or the mesh electrode. This is because the dispersibility of the raw material is improved and the adhesion of the raw material to the electrode is suppressed.
- a plurality of mesh electrodes are stacked at intervals to form a multilayer, and a voltage is applied between the mesh electrodes to form a separation zone. This is because the separation performance between the conductive component and the insulating component is improved. In this case, the separation performance (purity, recovery rate) can be easily set by changing the number of mesh electrodes.
- the bottom electrode and the mesh electrode are inclined, and It is preferable to supply the raw material to the upper end and recover the insulating component from the lower end of the bottom electrode. This is because large-scale and continuous processing becomes possible. In this case, the separation performance (purity, recovery) can be easily changed and set by changing the tilt angle of the electrode or the length of the mesh electrode in the tilt direction.
- the DC voltage applied between the electrodes it is preferable to change the DC voltage applied between the electrodes. This is because the separation performance is improved. It is also preferable to pulsate the DC voltage applied between the electrodes. This is because the particle adhesion layer formed on the electrode can be peeled off by electrification, powder adhesion to the electrode can be suppressed, and separation performance can be improved. Voltage pulsation means that the applied voltage is set to 0 kV by, for example, shorting the electrodes at intervals of several seconds.
- the conductive component it is preferable to collect the conductive component by sucking the gas in the space above the separation zone to the outside together with the conductive component. This is because separation of the conductive component is promoted. As a result, the recovery of the insulating component is also promoted.
- a member having a large number of suction holes is provided above or above the space above the separation zone, and the gas in the above space is sucked out through the suction holes together with the conductive component to provide a conductive material. Particles are quickly removed from the separation zone while the airflow shadows in the separation zone Can be suppressed and the conductive particles can be collected without deteriorating the separation performance, and large-volume and continuous processing can be performed.
- the recovered amount of the insulating particles or the amount of the conductive particles that have passed through the opening of the mesh electrode is measured, and the conductivity is determined in accordance with the measured recovery rate or the amount of change in the conductive particles. It is preferable to adjust at least one of the gas suction amount for recovering the conductive particles and the supply amount of the raw material particles. This is because the recovery of the insulating component is stable irrespective of changes in the properties of the raw materials, and continuous operation can be performed while maintaining stable separation performance.
- the method of the present invention it is preferable to perform at least one of stirring, heating, and adding a dispersant on the raw material powder before supplying the raw material powder to the separation zone. This is because the dispersibility of the raw materials can be improved.
- the raw material powder to be supplied contains unburned components
- the electrostatic separation device of the present invention is an electrostatic separation device for separating a raw material of a particulate material in which a conductive component and an insulating component are mixed into a conductive component and an insulating component by electrostatic force.
- a substantially flat bottom electrode provided on the lower side; a substantially flat mesh electrode having a large number of openings through which particles can pass, provided above the bottom electrode at a predetermined distance from the bottom electrode;
- a DC power source is connected to at least one of the mesh electrode and the bottom electrode, and when a voltage is applied between the bottom electrode and the mesh electrode, a separation zone is formed between the two electrodes. It becomes.
- a raw material supply unit is provided at one end between the bottom electrode and the mesh electrode, and a recovery unit for insulating components is provided at the other end.
- a recovery unit for insulating components is provided at the other end.
- a gas dispersion plate is formed by imparting air permeability to the bottom electrode, and a wind box for introducing a dispersion gas is provided below the gas dispersion plate, and the gas dispersion plate is provided. It is preferable that the gas is ejected. This is because the dispersibility of the supplied raw material particles can be improved, and the separation zone can be set to a dehumidified atmosphere.
- a vibration imparting means (vibrator or the like) or an impact imparting means (knocker or the like) is attached to the bottom electrode and / or the mesh electrode so that the electrode can be vibrated or impacted.
- a vibration imparting means (vibrator or the like) or an impact imparting means (knocker or the like) is attached to the bottom electrode and / or the mesh electrode so that the electrode can be vibrated or impacted.
- the bottom electrode and the mesh electrode are installed at an angle, a raw material supply section is provided at the upper end of the bottom electrode, and an insulating material is provided at the lower end of the bottom electrode. It is preferable to connect the conductive component recovering section, recover the conductive component above the separation zone through the opening of the mesh electrode, and recover the insulating component at the lower end of the bottom electrode. This is because a large amount and continuous separation of the insulating component and the conductive component can be performed.
- a DC high voltage generator capable of changing a voltage applied between the electrodes. This is because the electric field intensity in the separation zone changes and the separation performance is improved. It is also preferable to provide a DC high voltage generator capable of pulsating the voltage applied between the electrodes. By suppressing the powder adhesion to the electrode, the separation performance of the conductive particles and the insulating particles can be improved.
- a suction device is connected to a space above the separation zone. This is because the gas in the space above the separation zone is sucked outward together with the conductive component, so that the separation of the conductive component is promoted. As a result, the recovery of the insulating component is promoted.
- a tube or plate having a number of suction holes through which particles can pass is disposed on the side or above the space above the separation zone, and through this suction hole, It is preferable to adopt a configuration in which air is sucked.
- the conductive particles are sucked in a direction perpendicular to the direction in which the gas passes through the mesh electrode. Therefore, when the gas is sucked in the longitudinal direction of the separation zone (powder advancing direction), it can be sucked at a uniform flow rate. It is. Thereby, the insulating component and the conductive component can be separated in a large amount and continuously.
- a measuring instrument for continuously measuring the recovery rate of insulating particles
- a measuring instrument laser-light transmittance meter, Among them, it is preferable to arrange at least one of them. Measured by the above measuring instrument This is because the amount of gas suction for collecting the conductive particles, the supply amount of the raw material particles, and the like can be adjusted according to the obtained recovery rate or the amount of change in the conductive particles. By doing so, the recovery of the insulating component is stable irrespective of the change in the properties of the raw materials, and the continuous operation can be performed while maintaining the stable separation performance.
- This is a combination of the first electrostatic separation device and the classification device. This makes it possible to remove the conductive particles and produce fine powder with less impurities. [Brief description of drawings]
- FIG. 1 is a side view schematically illustrating an electrostatic separation device for explaining the principle of electrostatic separation in the present invention.
- FIG. 2 is an enlarged view of the conductive particles and the insulating particles in FIG.
- FIG. 3 is a vertical sectional view schematically showing the electrostatic separation device according to the embodiment of the present invention.
- FIG. 4 is a longitudinal sectional view schematically showing an electrostatic separation device according to another embodiment of the present invention.
- FIG. 5 is a longitudinal sectional view schematically showing an electrostatic separation device according to still another embodiment of the present invention.
- FIG. 6 is a longitudinal sectional view schematically showing an electrostatic separation device according to still another embodiment of the present invention.
- FIG. 7 is a longitudinal sectional view schematically showing an electrostatic separation device according to still another embodiment of the present invention.
- FIG. 8 is a perspective view schematically showing an electrostatic separation device according to still another embodiment of the present invention.
- FIG. 9 schematically shows an electrostatic separation device according to still another embodiment of the present invention.
- FIG. 10 schematically shows an electrostatic separation device according to still another embodiment of the present invention, in which (a) is a cross-sectional view and () is a vertical cross-sectional view.
- 4 schematically shows an electrostatic separation device according to still another embodiment of the present invention, in which (a) is a cross-sectional view and (b) is a longitudinal cross-sectional view.
- FIG. 12 is a cross-sectional view schematically showing an electrostatic separation device according to still another embodiment of the present invention.
- FIG. 13 is a perspective view conceptually showing an electrostatic separation system according to an embodiment of the present invention.
- FIG. 14 is a block diagram conceptually showing an electrostatic separation system according to another embodiment of the present invention.
- FIG. 15 is a block diagram showing an example of a raw material processing flow using the electrostatic separation of the present invention.
- FIG. 16 is a block diagram showing another example of a raw material processing flow using the electrostatic separation device of the present invention.
- a mixture of conductive particles 16 and insulating particles 18 is located between the positive (+) electrode 12 and the negative (1) electrode 14 in the form of a flat plate, which is the electrostatic separation zone 10.
- a coal ash containing unburned matter (conductive particles 16) and ash (insulating particles 18) is put in, and 0.2 to 1.5 kV m A voltage is applied between the electrodes so that an electric field of m is obtained.
- Reference numeral 20 denotes a DC high-voltage power supply.
- the insulating particles 18 are polarized by an induced charge in a high electric field, and the negatively charged side is attracted to the + electrode 12 (see FIG. 2). Arrow S).
- the positively charged side of the polarized insulating particles 18 is attracted to one electrode 14, and as a result, the insulating particles 18 remain between the two electrodes.
- the conductive particles 16 are positively inductively charged when attracted to the + electrode 12 and generate a repulsive force with the + electrode 12 (arrow R in FIG. 2) to rise, and the one-electrode 1 Sucked in 4.
- the conductive particles 16 are negatively inductively charged at one electrode 14 to generate a repulsive force with the one electrode 14, and are attracted to the + electrode 12.
- the conductive particles 16 fly out from between the electrodes (electrostatic separation zone 10) in a high electric field atmosphere. As described above, separation is performed by utilizing a difference in characteristics of an electric field acting on insulating particles and conductive particles.
- the electrostatic separation zone needs to be in an electric field atmosphere of 0.2 to 1.5 kVZmm.
- the lower limit of the electric field strength for more effective electrostatic separation is 0.3 kVZmm, and the upper limit is 0.8 kV / mm.
- the conductive particles fly out of the electrostatic separation zone, they will fly up and out of the electrostatic separation zone while repeatedly moving up and down within the electrostatic separation zone. As for the outward jump, the driving force for horizontal movement of the conductive particles does not work. For this reason, the movement time of the conductive particles until the conductive particles jump out of the electrostatic separation zone becomes longer, and it takes a long time to perform the separation, resulting in a decrease in the separation performance.
- FIG. 3 shows an apparatus for carrying out the electrostatic separation method according to the first embodiment of the present invention, in which a flat bottom electrode 26 is connected to a positive electrode (ground potential), and a mesh electrode 2 placed above it. 2 is used as an electrode, and a voltage is applied between these electrodes to form an electrostatic separation zone 10 in a high electric field atmosphere.
- the electrostatic separation zone 10 preferably has an electric field atmosphere of 0.2 to 1.
- S kVZmrr preferably 0.3 to 0.8 kV / mm.
- the bottom electrode 26 may be a single pole and the mesh electrode 22 may be a positive pole, and the positive pole and the single pole can be set arbitrarily.
- a raw material that is a mixture of the conductive particles 16 and the insulating particles 18, for example, unburned components (conductive particles 1 Coal ash containing 6) and ash (insulating particles 18) is supplied, and separation is performed in an electric field atmosphere of 0.2 to 1.5 kV / mm, preferably 0.3 to 0.8 kV / mm.
- the conductive particles 16 pass through the openings 24 of the mesh electrode 22 and are separated above the electrostatic separation zone 10. In this case, if the opening (opening) of the mesh is less than 0.15 mm, clogging is liable to occur, and if it exceeds 50 mm, the electric field intensity is biased and the separation performance deteriorates. 0.15 to 50 mm is preferred Re
- the principle of separation, and other configurations and operations are the same as those in FIGS. 1 and 2.
- the electrodes need not necessarily be installed in parallel, but if the distance between the electrodes exceeds 50 mm, a very large applied voltage is required to achieve the above-mentioned electric field strength. If it is less than 2 mm, sparks occur frequently and the thickness of the powder layer is limited, so that mass processing becomes difficult. Therefore, it is preferable that the distance between the electrodes is 2 to 50 mm.
- Separation performance is improved by preparatory treatment of the input raw materials, such as dispersion of particles or powder by sufficient agitation and application of triboelectricity, and addition of dispersants such as calcium stearate, sodium stearate, and cement admixtures. Is possible.
- the raw materials can be heated to improve their dispersibility.Separation of various particles or powders, such as metal separation from waste, removal of mercury, HC1, DXN, minerals or foods, etc. It is also possible to set the separation performance (purity of separated product and recovery rate) by changing the operating conditions such as the applied voltage so that it can cope with impurity removal.
- FIG. 4 shows an apparatus for performing the electrostatic separation method according to the second embodiment of the present invention.
- the bottom electrode constitutes gas distribution plate 28, and wind box 30 is provided below gas distribution plate 28.
- the gas dispersion plate 28 has a large number of minute holes through which the dispersion air 31 from the wind box 30 passes.
- the gas dispersion plate 28 is made of, for example, a sintered metal having air permeability.
- the air 31 for dispersion is introduced into the wind box 30, and the air 31 is ejected to the separation zone 10 through the minute holes of the gas dispersion plate 28.
- the aperture of the gas dispersion plate 28 must be large enough not to allow particles or powder to fall.
- dehumidified air for example, dehumidified air having a dew point of 0 ° C. or less
- the separation zone 10 becomes a dehumidifying atmosphere by using the dehumidifying air.
- FIG. 5 shows an apparatus for performing the electrostatic separation method according to the third embodiment of the present invention.
- the bottom electrode constitutes a gas dispersion plate 28
- a wind box 30 for introducing the dispersion air 31 is provided below the gas dispersion plate 28, and the device is provided with a vibrator or Knockers 32 are installed.
- a vibrator or a knocker 132 to apply vibration or impact to the gas dispersion plate 28 and the metal or mesh electrode 22 as the bottom electrode, the dispersion of particles or powder is promoted, At the same time as the separation performance is improved, the adhesion of particles or powder to the electrode can be suppressed.
- FIG. 6 shows an apparatus for performing the electrostatic separation method according to the fourth embodiment of the present invention.
- the bottom electrode constitutes a gas dispersion plate 28, and a wind box 30 for introducing the dispersion air 31 is provided below the gas dispersion plate 28, and the device has a vibrator or knocker. 3 2 are installed.
- a plurality of mesh electrodes are stacked at the above-mentioned predetermined intervals, and an electrostatic separation zone is formed between the mesh electrodes.
- four mesh electrodes 22a, 22b, 22c and 22d are multilayered, and the electrostatic separation zones 10a, 10b and 10c are formed.
- the 10 d is formed You.
- FIGS. 7, 8 and 9 show an apparatus for performing the electrostatic separation method according to the fifth embodiment of the present invention.
- the gas dispersion plate 34 serving as the bottom electrode and the multi-layered mesh-shaped electrodes 36a, 36b, 36c, 36d are inclined.
- a raw material supply unit 38 is provided at the upper end of the gas dispersion plate 34 serving as the bottom electrode, and an insulating particle recovery unit 40 is connected to the lower end of the gas dispersion plate 34.
- a wind box 42 for introducing the dispersion air 31 is provided below the gas dispersion plate 34, and a vibrator or a knocker 132 is attached to the device.
- mesh electrodes 36a, 36b, 36c, 36d are multilayered to form electrostatic separation zones 44a, 44b, 44c, 4 4d is formed, and the positive electrode and one electrode are alternately arranged, but the number of mesh electrodes, the arrangement of the positive electrode and one electrode are not limited to the above. .
- FIG. 8 is a perspective view of the device of the present embodiment.
- four mesh-like electrodes 36 are multilayered, and are configured such that the + electrode and the ⁇ electrode are alternately arranged.
- a DC high voltage generator capable of generating a pulsating (pulsed) voltage is applied to the mesh electrode.
- the raw device is connected.
- the application of voltage is pulsated, specifically, the electrodes are short-circuited at intervals of several seconds, and the applied voltage is set to 0 kV.
- the period of the pulsation shall be smaller than the residence time of the powder in the separation zone, and the time of the small voltage (or 0) shall be smaller than 1/2 of the residence time.
- a suction pipe 50 having a suction hole 51 as a conductive particle recovery unit is provided on a side above the separation zone 10, and a suction device (not shown) such as a dust collector or a blower is provided. Connected to device.
- a slit 53 for introducing outside air is provided between the suction pipe 50 and the ceiling surface 52, but the present invention is not limited to this configuration. In short, the installation position of the slit for introducing outside air may be selected so that the inside of the separation zone 10 is not affected by the airflow due to the suction.
- the suction mechanism above the separation zone 10 is not limited to a tube, but may be a plate having a large number of holes (reference numeral 54 in FIG. 10) or the like. Further, a slit may be formed instead of the hole. In short, any mechanism can be used as long as it can suck at a uniform flow rate along the longitudinal direction of the separation zone.
- the amount of air sucked by the suction pipe 50 should be larger than the amount of air for dispersion introduced through the gas dispersion plate (bottom electrode) 28 and should not exceed three times. If the amount of suction air is smaller than the amount of air for dispersion, the pressure inside the separation device becomes positive, and the powder is ejected from the slit 53 for external gas introduction together with the internal gas. If it exceeds three times, the upward airflow formed in the separation zone 10 may be greatly disturbed, and the separation performance may be reduced.
- the amount of dispersion air introduced through the gas dispersion plate 28 can be changed, or the conductivity can be improved. The effect on the separation performance due to fluctuations in the amount of suction air for collecting particles can be minimized.
- this device has a vibrator Alternatively, a knocker 32 is attached, but as shown in Fig. 10, it is configured so as not to vibrate by arranging it separately and independently from the part (housing etc.) that vibrates the suction mechanism such as the suction plate 54. May be. Further, as shown in FIG. 11, the suction pipe 50 may be connected to a housing or the like of the separation zone 10 so as to vibrate integrally.
- the space above the separation zone 10 can be made smaller by providing the suction mechanism 50, rather than having a general configuration in which only a hood is attached. .
- the capacity can be increased by a small device.
- the gas dispersion plate and the mesh-shaped electrode serving as the bottom electrode are inclined, the raw material is supplied onto the dispersion plate at the upper end, the insulating particles are collected from the lower end, and the upper part of the separation zone or By collecting the conductive particles at the top, continuous processing and large-scale processing are possible.
- Separation of various particles or powders for example, separation of unburned and ash in coal ash, metal separation from waste, removal of mercury, HC1, DXN, removal of impurities such as minerals and foods
- the separation performance is set by changing the operating conditions, such as changing the applied voltage, pulsating the applied voltage, or inclining the separation zone 10 so that it can also respond to It is also possible to do so.
- FIG. 13 shows an apparatus for performing the electrostatic separation method according to the sixth embodiment of the present invention.
- a mouthpiece 55 is provided in the insulating particle collecting section 40 as a collecting amount measuring device for measuring the amount of insulating particles collected.
- a laser light transmittance meter 56 as a passage amount measuring device for measuring the amount of conductive particles passing through the mesh electrode 36 is provided above the separation zone 10.
- the controller 57 controls the applied voltage of the DC voltage generator 62 according to the variation in the recovery of the insulating particles measured by the two measuring devices 55 and 56 or the amount of the conductive particles.
- FIG. 14 is a block diagram showing an example of the electrostatic separation system.
- Electrostatic separator 6 A DC voltage generator that applies a DC voltage to the electrodes of 1 62, a compressed air line 63 that supplies dehumidified air to the electrostatic separator 61 as dispersing air, and a compressed air line 6
- the conductive particles are not shown from the dehumidifier 6 4 interposed in 4, the fixed amount feeder 66 that supplies the raw material from the raw material hopper 65 to one end of the electrostatic separation device 61, and the electrostatic separation device 61. It is provided with a dust collector 67 for collecting by a blower or the like into a hopper (not shown) for collecting conductive particles, and an insulating particle collecting hopper 68 for collecting insulating particles from the electrostatic separator 61.
- FIGS. 15 and 16 are block diagrams showing a system including the electrostatic separation device according to the seventh embodiment of the present invention.
- coal ash collected by a dust collector using electric power or the like is transported to a hopper (not shown), the coal ash is cut out from the hopper, and separated into conductive particles and insulating particles by one of the electrostatic separation devices described above. Then, each separated particle is collected in a collection silo.
- JISA-6201 fly ash with an unburned content of 3% or less specified in Class I fly ash It is difficult to manufacture ash. Even if it can be manufactured, its recovery rate will be extremely low.
- the system shown in Fig. 15 using the above electrostatic separation device can produce coal ash with unburned content (3% or less) specified in JISA-6201 Fly Ash Class I. is there. However, if the specific surface area of the recovered coal ash does not satisfy the 500 stipulated by Fly Ash Class I, the combination of this electrostatic separation device and classification device as shown in Fig. 16 It is possible to produce coal ash that satisfies fly ash class I with high recovery rate. In other words, in the system of Fig. 16, the electrostatic A classifier is interposed in the path for collecting the insulating particles from the separating device to the insulating particle collection port. This makes it possible to obtain finer particles having a high ratio of insulating particles.
- electrostatic separation was performed under the following conditions. Dispersion air at 5 mm / sec is supplied to the dispersion plate (laminated sintered perforated plate), which is a + electrode plate installed on the bottom, and the entire device vibrates at an amplitude of 1.5 mm and a frequency of 25 Hz. With a mesh of 0.6 mm provided at a distance of 20 mm between the electrodes-a DC power supply is connected to the electrodes, and a voltage is applied between both electrodes to increase the electric field strength to 0. Electrostatic separation was performed at 5 kVZmm.
- electrostatic separation was performed under the following conditions.
- a dehumidifying air (dew point: 1-4) with a flow rate of 1 OmmZ seconds is supplied to the dispersion plate (laminated sintered porous plate), which is a + electrode installed on the bottom surface, and the entire device has an amplitude of 1.5 mm.
- Horizontal vibration was applied at the frequency of 25 Hz in the direction of the insulative particle collection section.Four electrodes with a mesh of 1 mm with a mesh of 2 O mm and a distance of 2 O mm above the bottom electrode Laminated and multilayered.
- Electrostatic separation was performed under the following conditions using the apparatus having the configuration shown in FIGS. 7, 8, and 9 described above.
- the dehumidifying air (dew point: 4 ° C) with a flow rate of 10 mmZ seconds is supplied to the dispersion plate (laminated sintered perforated plate), which is a + electrode installed on the bottom surface, and the whole equipment has an amplitude of 1.5 mm, vibration frequency 25 Hz, horizontal vibration is applied in the direction of the insulative powder collection section, and a 1 mm mesh with a 20 mm distance between the electrodes above the bottom electrode (+)
- Four electrodes were stacked to form a multilayer.
- the inclination angle of the electrode is 25 ° C.
- a dispersant calcium stearate
- the raw material powder is separated in the electrostatic separation zone while being dispersed by the vibration of the bottom surface and the effect of the dispersing agent, and the conductive particles (unburned) and the insulating particles (ash) are separated according to the principle described above. It is separated into As a result of this experiment, it was possible to continuously obtain powder of conductive particles (unburned matter) with a weight ratio of 1.2% and a supply amount of 75% as insulating particles.
- Electrostatic separation was performed under the following conditions using an apparatus with the configuration shown in Fig. 7, Fig. 8 and Fig. 9.
- the bottom electrode (+) is used as a dispersion plate (laminated sintered perforated plate)
- the dehumidified (dew point-4 ° C) air is supplied as dispersing air, and the entire apparatus is vibrated to apply horizontal vibration in the direction of the insulating powder recovery section.
- the test was performed using a device having a multilayered electrode.
- the electric field strength between the electrodes was 0.45 kV / mm, and every 10 seconds was 0 kV Zmm for 1 second. This is a so-called pulsation.
- the raw material is continuously supplied to the upper end of the bottom dispersion plate, and the raw material powder is supplied to the electrostatic separation zone while being dispersed by the vibration of the bottom surface and the effect of the air for dispersion.
- the particles are electrostatically separated into insulating particles and conductive particles.
- insulating particles conductive particles (unburned) at a weight ratio of 1.2% and powder of 78% of the supplied amount It could be obtained continuously.
- Fig. 9 shows an example.
- the same suction as the amount of gas introduced from the bottom dispersion plate was performed.
- Other conditions are the same as those in Experimental example 3.
- the insulating particles were electrostatically separated into insulating particles and conductive particles, and the insulating particles recovered in the insulating particle recovery section contained conductive particles (unburned) at a weight ratio of 1.1%. Powder could be obtained continuously with 70% recovery. In the collection part of the conductive particles, the powder containing the conductive particles (unburned matter) at a weight ratio of 11% was recovered at a recovery rate of about 30%.
- Fig. 9 Using the device, continuously measure the recovered amount of insulating particles in a single cell, as shown in Fig. 12, and apply so that the recovered amount is about 70% of the raw material supply amount. The test was performed with the voltage controlled. When the recovered amount of insulating particles was low, the applied voltage was low, and when it was high, the applied voltage was high. Other articles The conditions are the same as in Experimental Example 3.
- the appropriate applied voltage is different for different types of coal ash.
- 0.4 kVZmm is appropriate for coal ash A
- 0.6 kV Zmm is appropriate for coal ash B.
- a cover was attached to the entire separation zone, and an open part, that is, a suction part (collection part) was provided in front of the separation zone to collect the conductive particles. That is, the same conditions as in Experimental Example 5 were used except that the direction of suction of the conductive particles was different.
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DE60234328T DE60234328D1 (de) | 2001-03-27 | 2002-03-26 | Verfahren zur elektrostatischen trennung von teilchen, vorrichtung zur elektrostatischen trennung von teilchen und verarbeitungssystem |
JP2002575125A JP3981014B2 (ja) | 2001-03-27 | 2002-03-26 | 粒子の静電分離方法 |
EP02705489A EP1380346B1 (en) | 2001-03-27 | 2002-03-26 | Method for electrostatically separating particles, apparatus for electrostatically separating particles, and processing system |
US10/344,683 US7119298B2 (en) | 2001-03-27 | 2002-03-26 | Method for electrostatically separating particles, apparatus for electrostatically separating particles, and processing system |
AT02705489T ATE448021T1 (de) | 2001-03-27 | 2002-03-26 | Verfahren zur elektrostatischen trennung von teilchen, vorrichtung zur elektrostatischen trennung von teilchen und verarbeitungssystem |
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JP2001-89438 | 2001-03-27 | ||
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WO2002076620A1 true WO2002076620A1 (fr) | 2002-10-03 |
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PCT/JP2002/002878 WO2002076620A1 (fr) | 2001-03-27 | 2002-03-26 | Procede de separation electrostatique de particules, appareil de separation electrostatique de particules et systeme de traitement |
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US (1) | US7119298B2 (ja) |
EP (1) | EP1380346B1 (ja) |
JP (1) | JP3981014B2 (ja) |
AT (1) | ATE448021T1 (ja) |
DE (1) | DE60234328D1 (ja) |
WO (1) | WO2002076620A1 (ja) |
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JP2005066591A (ja) * | 2003-08-01 | 2005-03-17 | Nippon Steel Corp | 未燃炭素分離装置および分離方法 |
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JP2007117873A (ja) * | 2005-10-27 | 2007-05-17 | Nippon Steel Corp | 静電分離方法および静電分離装置 |
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Also Published As
Publication number | Publication date |
---|---|
JP3981014B2 (ja) | 2007-09-26 |
ATE448021T1 (de) | 2009-11-15 |
EP1380346A4 (en) | 2007-06-13 |
DE60234328D1 (de) | 2009-12-24 |
EP1380346B1 (en) | 2009-11-11 |
EP1380346A1 (en) | 2004-01-14 |
US7119298B2 (en) | 2006-10-10 |
US20040035758A1 (en) | 2004-02-26 |
JPWO2002076620A1 (ja) | 2004-07-15 |
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